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Created page with '{{OOP344 Index | 20132}} ==Objective== Your objective at this stage is to create series of core classes designed to interact with the user. These '''Core Classes''' then can be…'
{{OOP344 Index | 20132}}
==Objective==
Your objective at this stage is to create series of core classes designed to interact with the user. These '''Core Classes''' then can be used in development of any interactive application.
Please note that the class definitions here are minimum requirement for the Core Classes and you are free to add any enhancements or features you find useful. However make sure that you discuss these enhancements with your team and professor to make sure they are feasible before implementation.
It is highly recommended to develop the classes in the order they are stated here. You must create your own tester programs for each class (if possible); However, close to due date of each release, a tester program may be provided to help you verify the functionality of your classes. If tester programs are provided, then executables of the test programs will be available on matrix to show you how it is supposed to run.
Also object your professor's implementation of all the classes are available in your class notes repository. Please note the following:
* these implementations include a header file for each class and an object file for each class and platform
* these are for you to test your own implementation in case you need to have access to another class and they are not developed yet.
* like any other implementation, these implementations could be buggy
==Tips==
* [[GIT for OOP344 Projects| Guide for using Github]]
Start by creating mock-up classes (class declaration and definition with empty methods that only compiles and don't do anything).
Each class MUST have its own header file to hold its declaration and "cpp" file to hold its implementation. To make sure you do not do circular includes follow these simple guidelines:
* Add recompilation safeguards to all your header files.
* Always use forward declaration if possible instead of including a class header-file.
* Use includes only in files in which the actual header file code is used.
* '''Avoid "just in case" includes.'''
=CUI General Header file (cuigh.h)=
The general header file holds the common setting and definition between all the Core Classes. Review this header file at each stage of the project for changes.
<big><syntaxhighlight lang="cpp">
#ifndef ___CUIGH_H__
#define ___CUIGH_H__
namespace cio{
#ifndef _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE
#endif
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#define C_INITIAL_NO_FIELDS 50
#define C_DIALOG_EXPANSION_SIZE 20
#define C_BUTTON_HIT 1
#define C_MAX_LINE_CHARS (1024u)
#define C_REFRESH -2
#define C_FULL_FRAME -1
#define C_NO_FRAME 0
#define C_BORDER_CHARS "/-\\|/-\\|"
enum CDirection {centre, left, right, up, down};
// added after 0.3:
enum MessageStatus{ClearMessage,SetMessage};
#ifdef NO_HELPFUNC
# undef NO_HELPFUNC
#endif
#define NO_HELPFUNC ((void(*)(MessageStatus, CDialog&))(0))
#ifdef NO_VALDFUNC
# undef NO_VALDFUNC
#endif
#define NO_VALDFUNC ((bool(*)(const char*, CDialog&))(0))
#define C_MAX_LINE_CHARS (1024u)
#define C_INITIAL_NUM_OF_LINES (100u)
}
#endif
</syntaxhighlight></big>
==File Names==
Use the following rules to create filenames for your class.
*Each class MUST have its own header file and cpp file for implementation
*Use the class name for the name of the file but make sure it is all '''''lowercase'''''.
*:For example '''CFrame''' class should have '''cframe.h''' and '''cframe.cpp''' files for its implementation.
==Hierarchy==
<big><pre>
CFrame
|
|---CDialog
|
|
|---CField
|
|-------- CLabel
|
|
|-------- CButton
|
|
|-------- CLineEdit
| |
| |-------CValEdit
|
|-------- CText
|
|
|-------- CCheckMark
|
|
|-------- CCheckList
|
|
|-------- CMenuItem
|
|
|-------- CMenu
</pre></big>
==Issues, Releases and Due Dates==
*Issue Name Format
*:Issue and branch name format:<br />
V.V_Name <br />
example; issue: Add Text Class to the project (issue 2.9.1) issue and branch name on gitub: 2.9.1_AddTextClass<br />
=== 0.2 Milestone ===
# Add Console Class to the repo and test it with cio_test.cpp and Test1Frame.cpp.
# Create Mock-up classes
## CLabel Mock-up Class (issue 2.2)
## CDialog Mock-up Class (issue 2.3)
## CLineEdit Mock-up Class (issue 2.4)
## CButton Mock-up Class (issue 2.5)
====Details====
[[OOP344 0.2 Milestone 20131|0.2 milestone details]]
====Due Date====
Thursday Feb, 14th, 23:59
=== 0.3 Milestone ===
# Apply changes to CDialog, cuigh.h and update and test your related mock-ups. (issue 3.1)
# CLabel Implementation (issue 3.2)
# CDialog Implementation (issue 3.3)
# CLineEdit Implementation (issue 3.4)
# CButton Implementation (issue 3.5)
====Details====
====Due Date====
Wednesday March, 6th, 23:59
=== 0.5 Milestone ===
# All mock-ups (issue 5.1)
# CValEdit Implementation (issue 5.2)
# CCheckMark Implementation (issue 5.3)
# CMenuItem Implementation (issue 5.4)
====Details====
====Due Date====
Thursday March, 28th, 23:59
=== 0.8 and 0.9(optional) Milestone ===
# CText Implementation (issue 8.1)
# CCheckList Implementation (issue 8.2)
# CMenu Implementation (issue 9.1)
====Details====
====Due Date====
Saturday April, 6th, 23:59
=== 1.0 Milestone ===
# The application
====Details====
====Due Date====
Saturday April, 13th, 23:59
==CFrame==
The code for this class is provided in your repository. You must understand and use it to develop your core classes in your repository.
CFrame class is responsible to create a frame or structure in which all user interface classes contain themselves in. It can draw a border around it self or be border-less.
CFrame also, before displaying itself on the screen, will save the area it is about to cover, so it can redisplay them to hide itself.
CFrame is base of all objects in our user interface system.
<big><syntaxhighlight lang="cpp">
#include "cuigh.h"
class CFrame{
int _row; // relative row of left top corner to the container frame or the screen if _frame is null
int _col; // relative col of left top corner to the container frame or the screen if _frame is null
int _height;
int _width;
char _border[9]; // border characters
bool _visible; // is bordered or not
CFrame* _frame; // pointer to the container of the frame (the frame, surrounding this frame)
char* _covered; // pointer to the characters of the screen which are covered by this frame, when displayed
void capture(); // captures and saves the characters in the area covered by this frame when displayed and sets
// _covered to point to it
void free(); // deletes dynamic memory in the _covered pointer
protected:
int absRow()const;
int absCol()const;
public:
CFrame(int Row=-1, int Col=-1, int Width=-1,int Height=-1,
bool Visible = false,
const char* Border=C_BORDER_CHARS,
CFrame* Frame = (CFrame*)0);
virtual void draw(int fn=C_FULL_FRAME);
virtual void move(CDirection dir);
virtual void move();
virtual void hide();
virtual ~CFrame();
/* setters and getters: */
bool fullscreen()const;
void visible(bool val);
bool visible()const;
void frame(CFrame* theContainer);
CFrame* frame();
void row(int val);
int row()const;
void col(int val);
int col()const;
void height(int val);
int height()const;
void width(int val);
int width()const;
void refresh();
};
</syntaxhighlight></big>
===Properties===
int _row, holds the relative coordinate of top row of this border with respect to its container.<br />
int _col, same as _row, but for _col. <br />
int _height, height of the entity. <br />
int _width, width of the entity. <br />
char _border[9], characters used to draw the border: <br />
: _border[0], left top
: _border[1], top side
: _border[2], right top
: _border[3], right side
: _border[4], right bottom
: _border[5], bottom side
: _border[6], bottom left
: _border[7], left side
bool _visible; Indicates if the border surrounding the entity is to be drawn or not. <br />
CFrame* _frame; holds the container (another CFrame) which has opened this one (owner or container of the current CFrame). '''_frame''' will be NULL if this CFrame does not have a container, in which case, it will be full screen and no matter what the values of row, col, width and height are, CFrame will be '''Full Screen''' (no border will be drawn)<br />
char* _covered; is a pointer to a character array that hold what was under this frame before being drawn. When the CFrame wants to hide itself, it simple copies the content of this array back on the screen on its own coordinates.
===Methods and Constructors===
====Private Methods====
<big><syntaxhighlight lang="cpp">
void capture();
</syntaxhighlight></big>
:if _covered pointer is not pointing to any allocated memory, it will call the iol_capture function to capture the area that is going to be covered by this frame and keeps its address in _covered.
====Protected Methods====
*int absRow()const; calculates the absolute row (relative to the left top corner of the screen) and returns it.
*:it returns the sum of '''row()''' of this border plus all the '''row()'''s of the '''_frame'''s
*int absCol()const; calculates the absolute column(relative to the left top corner of the screen) and returns it.
*:it returns the sum of '''col()''' of this border plus all the '''col()'''s of the '''_frame'''s
====Public Methods====
<big><syntaxhighlight lang="cpp">
CFrame(int Row=-1, int Col=-1, int Width=-1,int Height=-1,
bool Visible = false,
const char* Border=C_BORDER_CHARS,
CFrame* Frame = (CFrame*)0);
</syntaxhighlight></big>
:Sets the corresponding attributes to the incoming values in the argument list and set _covered to null
<big><syntaxhighlight lang="cpp">
virtual void draw(int fn=C_FULL_FRAME);
</syntaxhighlight></big>
* First it will '''capture()''' the coordinates it is supposed to cover
* If frame is '''fullscreen()''' then it just clears the screen and exits. <br />
Otherwise:<br />
*If the _visible flag is true, it will draw a box at _row and _col, with size of _width and _height using the _border characters and fills it with spaces. Otherwise it will just draw a box using spaces at the same location and same size.
<big><syntaxhighlight lang="cpp">
virtual void move(CDirection dir);
</syntaxhighlight></big>
First it will hide the Frame, then adjust the row and col to move to the "dir" direction and then draws the Frame back on screen.
<big><syntaxhighlight lang="cpp">
virtual void hide();
</syntaxhighlight></big>
using iol_restore()it restores the characters behind the Frame back on screen. It will also free the memory pointed by _covered;
<big><syntaxhighlight lang="cpp">
virtual ~CFrame();
</syntaxhighlight></big>
It will make sure allocated memories are freed.
<big><syntaxhighlight lang="cpp">
bool fullscreen()const;
void visible(bool val);
bool visible()const;
void frame(CFrame* theContainer);
CFrame* frame();
void row(int val);
int row()const;
void col(int val);
int col()const;
void height(int val);
int height()const;
void width(int val);
int width()const;
</syntaxhighlight></big>
These functions set and get the attributes of the CFrame.
===CFrame Student Resources===
====CFrame Help/Questions Blogs====
====CFrame Blog Posts====
==CField==
CField is an abstract base class that encapsulates the commonalities of all Input Outputs Console Fields which are placeable on a CDialog. All Fields could be Framed, therefore a CField is inherited from CFrame.
<big><syntaxhighlight lang="cpp">
#include "cframe.h"
class CDialog;
class CField : public CFrame{
protected:
void* _data;
public:
CField(int Row = 0, int Col = 0,
int Width = 0, int Height =0,
void* Data = (void*) 0,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
~CField();
virtual int edit() = 0;
virtual bool editable() const = 0;
virtual void set(const void* data) = 0;
virtual void* data()const; //<== check this, not sure
void container(CDialog* theContainer);
CDialog* container();
};
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
void* _data;
</syntaxhighlight></big>
Will hold the address of any type of data a CField can hold.
===Constructors and Methods===
<big><syntaxhighlight lang="cpp">
CField(int Row = 0, int Col = 0,
int Width = 0, int Height =0,
void* Data = (void*) 0,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Passes the corresponding attributes to it's parents (CFrame) constructor and then sets the _data attribute to the incoming Data argument. Also using '''container(CDialog* theContainer)''' it set the container to NULL.
<big><syntaxhighlight lang="cpp">
~CField();
</syntaxhighlight></big>
Empty Destructor
<big><syntaxhighlight lang="cpp">
virtual int edit() = 0;
virtual bool editable() const = 0;
virtual void set(const void* data) = 0;
</syntaxhighlight></big>
Pure virtual methods to enforce the children to implement;
* an edit() method
* an editable() method that returns true if the class is to edit data and false if the class is to only display data.
* a set() method to set the _data attribute to the data the class is to work with.
<big><syntaxhighlight lang="cpp">
virtual void* data() const; <--- Check this not sure....
</syntaxhighlight></big>
Returns _data.
<big><syntaxhighlight lang="cpp">
void container(CDialog* theContainer);
</syntaxhighlight></big>
Casts '''"theContainer"''' to a CFrame pointer and passes it to CFrame::frame(CFrame*) method; (to set the frame of CDialog)
<big><syntaxhighlight lang="cpp">
CDialog* container();
</syntaxhighlight></big>
Casts the return value of CFrame::frame() to a CDialog pointer and returns it.
===CField Student Resources===
====CField Help/Questions Blogs====
====CField Blog Posts====
==CLabel==
A readonly Field that encapsulates console.display() function. (i.e it is responsible to display a short character string on the display) CLabel although, by inheritance is Frame, but it is never '''bordered'''.
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
class CLabel : public CField{
// for length of the field:
// Use void CFrame::width(int) to store length, and int CFrame::width() to retrieve the length
public:
CLabel(const CLabel& L);
CLabel(const char *Str, int Row, int Col,
int Len = 0);
CLabel(int Row, int Col, int Len);
~CLabel();
void draw(int fn=C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* str);
};
</syntaxhighlight></big>
===Attributes===
No attributes, (use Cframe attributes)
===Constructors / Destructor ===
<big><syntaxhighlight lang="cpp">
CLabel(const char *Str, int Row, int Col,
int Len = 0);
</syntaxhighlight></big>
passes the Row and Col to the CField constructor and then;
if len is zero, it will allocate enough memory to store the string pointed by Str and then copies the Str into it.
if len > 0, then it will allocate enough memory to store '''len''' chars, copying only len characters of str.
In any way, the allocated memory is pointed by '''_data'''. Also it will set the width to the length of the memory allocated.
<big><syntaxhighlight lang="cpp">
CLabel(int Row, int Col, int Len);
</syntaxhighlight></big>
Works exactly like the previous constructor, but len in this case can not be zero. (no validation required) and the string pointed by _data will be set to an empty string.
<big><syntaxhighlight lang="cpp">
CLabel(const CLabel& L);
</syntaxhighlight></big>
Copies a CLabel safely to guaranty there is no memory leak.
<big><syntaxhighlight lang="cpp">
~CLabel();
</syntaxhighlight></big>
makes sure that memory pointed by _data is deallocated before the object is destroyed.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn=C_NO_FRAME) ;
</syntaxhighlight></big>
makes a direct call to console.display(), passing '''_data''' for the string to be printed and absRow() and absCol() for row and col and _length for len.
this function ignores the argument fn.
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
calls draw, returning 0.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
always return false.
<big><syntaxhighlight lang="cpp">
void set(const void* str);
</syntaxhighlight></big>
if width() is greater than zero, it will copy the string pointed by str into the string pointed by _data upto width characters.
if width() is zero,<br /> It will delete the memory pointed by _data and reallocates enough memory for str and copies the string pointed by str into the newly allocated memory pointed by _data.
===CLabel Student Resources===
====CLabel Help/Questions Blogs====
====CLabel Blog Posts====
==CDialog==
Organizes CField objects on the screen, displays them and then lets the user edit them one by one.
<big><syntaxhighlight lang="cpp">
#include "cuigh.h"
#include "cframe.h"
namespace cio{
class CField;
class CDialog: public CFrame{
private:
int _fnum;
int _curidx;
CField** _fld;
bool* _dyn;
bool _editable;
unsigned int _fldSize;
public:
CDialog(CFrame *Container = (CFrame*)0,
int Row = -1, int Col = -1,
int Width = -1, int Height = -1,
bool Borderd = false,
const char* Border=C_BORDER_CHARS);
virtual ~CDialog();
void draw(int fn = C_FULL_FRAME);
int edit(int fn = C_FULL_FRAME);
int add(CField* field, bool dynamic = true);
int add(CField& field, bool dynamic = false);
CDialog& operator<<(CField* field);
CDialog& operator<<(CField& field);
bool editable();
int fieldNum()const;
int curIndex()const;
CField& operator[](unsigned int index);
CField& curField();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
int _fnum;
</syntaxhighlight></big>
Holds the number of Fields added to the Dialog
<big><syntaxhighlight lang="cpp">
bool _editable;
</syntaxhighlight></big>
will be set to true if any of the Fields added are editable.
This is optional because it depends on how you are going to implement the collection of CFields:
<big><syntaxhighlight lang="cpp">
int _curidx;
</syntaxhighlight></big>
Holds the index of the Field that is currently being edited.
<big><syntaxhighlight lang="cpp">
CField** _fld;
</syntaxhighlight></big>
Dynamic array of CField pointers to hold the address of the CField objects added to the screen. The initial size of the array allocation is defined in '''''cuigh.h''''' under C_INITIAL_NO_FIELDS.
<big><syntaxhighlight lang="cpp">
bool* _dyn;
</syntaxhighlight></big>
A dynamic bool array that holds series of booleans to the exact number of fields, and each boolean here will hold false if the corresponding field pointed by _fld is allocated dynamically or not. The initial size of the array allocation is defined in '''''cuigh.h''''' under C_INITIAL_NO_FIELDS. <br />
This array will later on be used by destructor to decide which object is dynamic and to be deleted.
<big><syntaxhighlight lang="cpp">
unsigned int _fldSize;
</syntaxhighlight></big>
Holds the current length of '''''_fld''''' and '''''_dyn'''''. <br />When adding a field to dialog if '''_fum''' reaches '''_fldSize''', then the size of '''_fld''' and '''_dyn''' is expanded by '''''C_DIALOG_EXPANSION_SIZE''''', defined in '''cuigh.h'''
===Constructors/Destructors===
<big><syntaxhighlight lang="cpp">
CDialog(CFrame *Container = (CFrame*)0,
int Row = -1, int Col = -1,
int Width = -1, int Height = -1,
bool Borderd = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
The constructor passes all the incoming arguments to the corresponding arguments of the apparent constructor '''CFrame'''.<br />
Then it will set all called attributes to their default values and then sets all the field pointers (_fld) to NULL.
It also sets all the dynamic (_dyn) flags to false.
<big><syntaxhighlight lang="cpp">
virtual ~CDialog();
</syntaxhighlight></big>
The destructor will loop through all the field pointers and if the corresponding dynamic flag is true then it will delete the field pointed to by the field pointer.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
If '''fn''' is '''C_FULL_FRAME''', it will call its parent draw. Then It will draw all the '''Fields''' in the '''Dialog'''. <br />
If '''fn''' is Zero, then it will just draw all the '''Fields''' in the '''Dialog'''.<br />
If '''fn''' is a non-zero positive value, then it will only draw '''Field''' number '''fn''' in the dialog. (First added '''Field''' is field number one.)
<big><syntaxhighlight lang="cpp">
int edit(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
If '''CDialog''' is not editable (all fields are non-editable), it will just display the Dialog and then waits for the user to enter a key and then terminates the function returning the key.<br />
If fn is '''0''' or less, then before editing, the draw method is called with '''fn''' as its argument and then editing begins from the first editable Field.
If fn is greater than '''0''' then editing begins from the first editable key on or after Field number '''fn'''.
Note that fn is the sequence number of field and not the index. (First field number is one)
Start editing from field number '''fn''';
Call the edit of each field and depending on the value returned, do the following:<br />
# For '''ENTER_KEY''', '''TAB_KEY''' and '''DOWN_KEY''', go to next editable Field , if this is the last editable Field then restart from Field number one.
# For '''UP_KEY''' go to the previous editable Field, if there is no previous editable Field, go to the last editable Field in the Dialog.
# For any other key, terminate the edit function returning the character which caused the termination.
<big><syntaxhighlight lang="cpp">
int add(CField* field, bool dynamic = true);
</syntaxhighlight></big>
First, this function will check the value of _fnum. If '''_fnum''' has reached '''_fldSize''', ('''_fld''' and '''_dyn''' arrays are full) it will expand '''_fld''' and '''_dyn''' by '''C_DIALOG_EXPANSION_SIZE''' (defined in '''cuigh.h''') to make room for more '''CField'''.<br />
Then, it adds the CField pointed by '''field''' to the Fields of the Dialog; by appending the value of the field pointer after the last added ''field'' in the _fld array , setting the corresponding _dyn element to the value of dynamic argument and then increasing _fnum by one and returning the index of added Field in the CDialog object.<br />
'''important note:'''<br />
Make sure that add() sets the container of the added CField to this CDialog object, using the container() method of CField<br />
Also make sure, if size of _fld and _dyn are expanded, then _fldSize is also increased.
<big><syntaxhighlight lang="cpp">
int add(CField& field, bool dynamic = false);
</syntaxhighlight></big>
Makes a direct call to the first add method.
<big><syntaxhighlight lang="cpp">
CDialog& operator<<(CField* field);
</syntaxhighlight></big>
Makes a direct call to the first add method, ignoring the second argument and then returns the owner (current CDialog).
<big><syntaxhighlight lang="cpp">
CDialog& operator<<(CField& field);
</syntaxhighlight></big>
Makes a direct call to the second add method, ignoring the second argument and then returns the owner (current CDialog).
<big><syntaxhighlight lang="cpp">
bool editable();
</syntaxhighlight></big>
Returns '''_editable''';
<big><syntaxhighlight lang="cpp">
int fieldNum()const;
</syntaxhighlight></big>
returns '''_fnum'''.
<big><syntaxhighlight lang="cpp">
int curIndex()const;
</syntaxhighlight></big>
returns '''_curidx''';
<big><syntaxhighlight lang="cpp">
CField& operator[](unsigned int index);
</syntaxhighlight></big>
Returns the reference of the Field with incoming index. (Note that here, the first field index is '''0''')
<big><syntaxhighlight lang="cpp">
CField& curField();
</syntaxhighlight></big>
Returns the reference of the Field that was just being edited.
===CDialog Student Resources===
====CDialog Help/Questions Blogs====
does anyone know the meaning of the following sentence?if you know,feedback as soon as possible
int add(CField* field, bool dynamic = true);
Make sure that add() sets the container of the added CField to this CDialog object, using the container() method of CField(vivek patel)
====CDialog Blog Posts====
==CLineEdit==
'''ClineEdit''' encapsulates the console.edit() function of Console class.
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
namespace cio{
class CLineEdit: public CField{
bool _dyn;
int _maxdatalen;
bool* _insertmode;
int _curpos;
int _offset;
public:
CLineEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CLineEdit(int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
~CLineEdit();
void draw(int Refresh = C_FULL_FRAME);
int edit();
bool editable()const;
void set(const void* Str);
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
bool _dyn;
</syntaxhighlight></big>
_dyn is set to true if the object dynamically allocated memory and is responsible to free it at destruction time.
<big><syntaxhighlight lang="cpp">
int _maxdatalen;
</syntaxhighlight></big>
no comment!
<big><syntaxhighlight lang="cpp">
bool* _insertmode;
</syntaxhighlight></big>
points to the location of input method (insert or overstrike)
<big><syntaxhighlight lang="cpp">
int _curpos;
</syntaxhighlight></big>
current position of cursor
<big><syntaxhighlight lang="cpp">
int _offset;
</syntaxhighlight></big>
current offset
===Constructors / Destructor===
<big><syntaxhighlight lang="cpp">
CLineEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, int* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
LineEdit, sets the Field's _data to the value of str. If LineEdit is instantiated with this constructor then it will edit an external string provided by the caller function of LineEdit. LineEdit in this case is not creating any dynamic memory, therefore _dyn is set to false (therefore the destructor will not attempt to deallocate the memory pointed by _data).<br />
The location (row and col) and Bordered are directly passed to the parent (CField) and str is passed as data to the parent constructor. Unlike Label, LineEdit could have border or not so depending on this (Bordered being true or false) the Height is set to 3 or 1 respectfully. <br />
(hint: use '''? :''' operator to pass the proper Height value to CField's constructor)
<big><syntaxhighlight lang="cpp">
CLineEdit(int Row, int Col, int Width,
int Maxdatalen, int* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Works exactly like the previous constructor with one difference; since no external data is passed to be edited here, this constructor must allocate enough dynamic memory to accommodate editing of '''Maxdatalen''' characters. Then make it an empty string and set Fields's _data to point to it. Make sure _dyn is set to true in this case, so the destructor knows that it has to deallocate the memory at the end.
<big><syntaxhighlight lang="cpp">
~CLineEdit();
</syntaxhighlight></big>
If '''_dyn''' is true, it will deallocate the character array pointed by Fields's '''_data'''
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int Refresh = C_FULL_FRAME);
</syntaxhighlight></big>
It will first call Frame's draw passing '''Refresh''' as an argument to it.<br />
Then it will make a direct call to console.display() to show the data kept in Field's '''_data'''.<br />
The values used for the arguments of console.display() are:
*str: address of string pointed by _data + the value of _offset
*row: absRow() (''add one if border is visible'')
*col: absCol() (''add one if border is visible'')
*len: width() (''reduce by two if border is visible''')
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
Makes a direct call to, and returns '''console.edit()'''.
For the coordinates and width arguments follow the same rules as the draw function.
For the rest of the arguments of console.edit(), use the attributes of '''CLineEdit'''.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always return true;
<big><syntaxhighlight lang="cpp">
void set(const void* Str);
</syntaxhighlight></big>
Copies the characters pointed by '''Str''' into the memory pointed by Field's '''_data''' up to '''_maxdatalen''' characters.
===CLineEdit Student Resources===
====CLineEdit Help/Questions Blogs====
*Does anyone know that what value I have to assign to _offset and _curpos for CLineEdit attribute since there is no value passed by the constructor? Chun Chen
----> _offset and _curpos are set to 0. -Koghulan Namasivayam
====CLineEdit Blog Posts====
==CButton==
Button is a child of CField.
It displays a small piece of text (usually one word or two) and accepts one key hit entry.
When in edit mode, to indicate the editing mode, it will surround the text with squared brackets.
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
namespace cio{
class CButton: public CField{
public:
CButton(const char *Str, int Row, int Col,
bool Bordered = true,
const char* Border=C_BORDER_CHARS);
virtual ~CButton();
void draw(int rn=C_FULL_FRAME);
int edit();
bool editable()const;
void set(const void* str);
};
}
</syntaxhighlight></big>
===Attributes===
This class does not have any attributes of its own!
===Constructor / Destructor===
<big><syntaxhighlight lang="cpp">
CButton(const char *Str, int Row, int Col,
bool Bordered = true,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
When creating a Button, allocate enough memory to hold the contents of the '''Str''' and set Field's _data to point to it. Then copy the content of '''Str''' into the newly allocated memory.<br />
Pass all the arguments directly to Field's constructor.<br />
For Field size (width and hight) do the following:<br />
For width: Set width to the length of '''Str''' + 2 (adding 2 for surrounding brackets) or if the Button is bordered set width to the length of '''Str''' + 4 (adding 2 for surrounding brackets and 2 for the borders).
For height: Set the height to 1 or if the Button is bordered, set the height to 3.
<big><syntaxhighlight lang="cpp">
virtual ~CButton();
</syntaxhighlight></big>
Deallocates the allocated memory pointed by Field's '''_data'''.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn=C_FULL_FRAME);
</syntaxhighlight></big>
Draws the Button with border around it if it is Bordered. Note that there should be a space before and after of the text that will be used to surround the text with "[" and "]"<br />
hint:<br />
:*First calls Frame's draw(fn) (passing the fn argument to the parents draw)
:Use console.display() to display the Button's text (pointed by Field's _data)
:*If not bordered
:*:display the text at absRow() and absCol()
:*If bordered
:*:display the text at absRow()+1 and absCol()+2
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
First draw() the Button, then surround it by squared brackets, place the cursor under the first character of Button's text and wait for user entry.<br />
When user hits a key, if the key is ENTER_KEY or SPACE, return C_BUTTON_HIT (defined in cuigh.h) otherwise return the entered key.<br />
<big><syntaxhighlight lang="cpp">
void set(const void* str);
</syntaxhighlight></big>
First deallocated what is pointed by Field's _data.
Then allocate new memory to the size of content of str and copy the content into it and make
Field's _data point to it.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always returns true
===CButton Student Resources===
====CButton Help/Questions Blogs====
[http://pankajsama01.blogspot.ca/2013/03/cbuttonhit-key.html C_BUTTON_HIT Key] is not defined(Pankaj Sama)
** It is defined in the new cuigh.h file. It is defined #define C_BUTTON_HIT 1. Gary Chen
====CButton Blog Posts====
==CValEdit==
This class works exactly like CLineEdit and improves it by adding two features; Validation and Help. CValEdit is capable of validating the user input on exit and also provide help when CValEdit::edit() is active by invoking a '''"help"''' method before and after editing. If these two functions, (Validation and Help) are not provided, then CValEdit literally works like CLineEdit.
<big><syntaxhighlight lang="cpp">
#include "clineedit.h"
namespace cio{
class CValEdit: public CLineEdit{
void (*_help)(MessageStatus, CDialog&);
bool (*_validate)(const char*, CDialog&);
public:
CValEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CValEdit(int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
int edit();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
void (*_help)(MessageStatus, CDialog&);
bool (*_validate)(const char*, CDialog&);
</syntaxhighlight></big>
*_help, holds the address of the help logic (function) or NULL if there is no help function is assigned
*_validate, holds the address of the validation logic (function) or NULL if there is no validation function is assgned
===Constructors===
<big><syntaxhighlight lang="cpp">
CValEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CValEdit(int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
These constructors pass all their arguments to corresponding arguments of CLineEdit constructor and then set '''_help''' and '''_validate''' attributes to the corresponding incoming arguments
===Method===
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
If the container() is NULL then this function works exactly like LineEdit::edit().<br />
If the container() is not NULL:
#If _help function exist, it calls the function passing MessageStatus::SetMessage and container()'s reference as arguments.
#Calls CLineEdit's edit()
#If validation function exists, and the terminating key of CLineEdit's edit() is a navigation key(see below)
#:It will call the validation function on the Field's _data, if the data is valid, it goes to next step, otherwise it will repeat calling CLineEdit's edit().
#After validation is done, if _help function exists, it will recall the help function using MessageStatus::ClearMessage and contianer()'s reference as arguments.
#It will return the terminating key
''Navigation keys are Up key, Down key, Tab key or Enter key.''<br />
''MessageStatus is enumerated in '''cuigh.h'''''
===CValedit Student Resources===
====CValEdit Help/Questions Blogs====
{| class="wikitable" border="1"
| [http://divya522.blogspot.ca/2013/03/errors-in-cvaledit.html Cdirection Error]||[mailto:dsharma37@myseneca.ca?subject=oop344 Divya Sharma]||
|}
====CValedit Blog Posts====
==CCheckMark==
Creates a single CheckMark on the screen and allows the user to:<br />
# Toggle it, if it is set to be a CheckMark for a Check List.
# Only check it when its unchecked, if it is set to be a CheckMark for a Radio Button List.
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
#include "clabel.h"
namespace cio{
class CCheckMark : public CField{
bool _flag;
bool _radio;
char _format[4];
CLabel _Label;
public:
CCheckMark(bool Checked,const char* Format, const char* Text,
int Row, int Col, int Width, bool IsRadio = false);
CCheckMark(const CCheckMark& C);
void draw(int fn = C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* flag);
bool checked()const;
void checked(bool val);
bool radio();
void radio(bool isRadio);
operator bool();
operator char*();
bool operator=(bool flag);
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
int _flag;
bool _radio;
char _format[4];
CLabel _Label;
</syntaxhighlight></big>
*'''_flag''' holds the status of the Checkbox (0: unchecked or 1: checked ) and is pointed by _data pointer .
*'''_radio''' dictates the behavior of the Checkbox as a radio-button, or a check-mark.
*'''_format''' holds the characters, the Checkbox is drawn with (i.e. "[X]", "(O)", "<*>", etc...).
*'''_Label''' holds the Label attached to the this Checkbox
===Constructor / Destructor===
<big><syntaxhighlight lang="cpp">
CCheckMark(bool Checked,const char* Format, const char* Text, int Row, int Col, int Width, bool IsRadio = false);
</syntaxhighlight></big>
*Passes the ''Row, Col, Width and "1"'' to ''row, col, width and height'' arguments of CField and directly initializes _Label with ''Text, 0, 4, and (Width-4)'' for ''Str, Row, Col and Len'', arguments of CLabel's Constructor.<br />
*Sets the frame of _Label to its owner (Checkmark i.e. 'this');
*Sets _flag to Checked
*Sets _radio to IsRadio
*Copies Format to _format
*Sets _data to the address of _flag
<big><syntaxhighlight lang="cpp">
CCheckMark(const CCheckMark& C);
</syntaxhighlight></big>
*Passes incoming CCheckMark reference ("C") to CField's copy constructor, and directly initializes the _Label with the _Label of C
*Sets all the attributes of this object to the attributes of incoming CCheckMark reference ("C")
*Sets _data to the address of _flag
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_NO_FRAME) ;
</syntaxhighlight></big>
Using Console methods:<br />
#displays the _format string at absRow() and absCol()
#if _flag is false, it will overwrite the second character printed above, with a space (removes the check mark on console)
#draw()s the _Label
#sets the position of the cursor at the checkmark (second character of printed _format)
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
#draw()s the checkmark
#gets a key
#: the key must be either SPACE or any non-printable character (all printable character are ignored)
#if the entered key is space
##if _radio is true, it will set the _flag to true
##if _radio is false, it will flip the value of _flag.
##draw()s the checkmark again
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
*Always return true;
<big><syntaxhighlight lang="cpp">
void set(const void* flag);
</syntaxhighlight></big>
*Casts the incoming flag pointer to an (bool*) and sets the content of '''_flag''' to where '''flag''' is pointing to.
<big><syntaxhighlight lang="cpp">
bool checked()const;
void checked(bool val);
</syntaxhighlight></big>
*These methods set and get _flag.
<big><syntaxhighlight lang="cpp">
bool radio(); // addition for R0.6
void radio(bool isRadio); // addition for R0.6
</syntaxhighlight></big>
* These to methods, get and set the '''_radio''' attribute.
<big><syntaxhighlight lang="cpp">
operator bool(); // addtion for R0.6
</syntaxhighlight></big>
* Overload the '''bool''' cast to return the value of '''_flag'''
<big><syntaxhighlight lang="cpp">
operator char*(); // addtion for R0.6
</syntaxhighlight></big>
* Overload the '''char*''' cast to return the value of '''_Label.data()'''
<big><syntaxhighlight lang="cpp">
bool operator=(bool flag);; // addtion for R0.6
</syntaxhighlight></big>
* Overload the operator= and set the _flag to flag
===CCheckMark Student Resources===
====CCheckMark Help/Questions Blogs====
Hey Guys, In the constructor for CCheckmark it says : set the frame of _Label to its owner
(checkmark i.e, "this")
Can anyone tell me what this means or what the purpose of this is. Thanks in advance.
Use this with caution since I don't really know if it is correct, but I did
'''Label.container(this->container());'''
-Bo Li
http://lhmcintosh.blogspot.ca/2013/03/this.html Hope this helps! - LMC
Please help - http://oop344class.wordpress.com/2013/03/29/setting-cursor-position-in-ccheckmark-draw-function/
-S.E.
====CCheckMark Blog Posts====
==CMenuItem==
CMenuItem provides a Label that can be marked as selected by pressing the space bar.
<big><syntaxhighlight lang="cpp">
#include "clabel.h"
#include "cfield.h"
namespace cio{
class CMenuItem:public CField{
bool _selected;
char _format[3];
CLabel Label;
public:
CMenuItem(bool Selected,const char* Format, const char* Text,
int Row, int Col, int Width);
CMenuItem(const CMenuItem &CM);
void draw(int fn = C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* Selected);
bool selected()const;
void selected(bool val);
const char* Text();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
bool _selected;
</syntaxhighlight></big>
Holds the status of the MenuItem, being selected or not;
<big><syntaxhighlight lang="cpp">
char _format[3];
</syntaxhighlight></big>
Holds the surrounding characters with which a selected MenuItem is shown:<br />
If _format holds "[]", then a selected MenuItem will be like [MenuText]
<big><syntaxhighlight lang="cpp">
CLabel Label;
</syntaxhighlight></big>
Hold the Text of the MenuItem.
===Constructors / Destructor===
<big><syntaxhighlight lang="cpp">
CMenuItem(bool Selected,const char* Format, const char* Text, int Row, int Col, int Width);
</syntaxhighlight></big>
#Initializes the CField with Row, Col, Width and 1 for Height
#Initializes the Label with (Text, 0, 1 and Width-2) for (Str, Row, Col, and Len)
#Sets the attributes to corresponding arguments
#Sets CFields::_data to the address of _format
#Sets the Label's frame to this object.
<big><syntaxhighlight lang="cpp">
CMenuItem(const CMenuItem &CM);
</syntaxhighlight></big>
#Passes CM to CField and Initializes the Label with CM
#Sets the _selected to _selected of CM
#Sets CFields::_data to the address of _format
#Sets the Label's frame to this object.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_NO_FRAME) ;
</syntaxhighlight></big>
#Draws the Label with fn
#If _selected is true, it surrounds the Label Text the _format[0] and _format[1]
#If _selected if false, it surrounds the Label with SPACEs (overwrites _format[0] and _format[1])
#Positions the cursor at the first character of the Label
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
#draw()s the MenuItem
#gets a key
#: the key must be either SPACE or any non-printable character (all printable character are ignored)
#if the entered key is space
##it will set the _selected to true
##draw()s the MenuItem again
#returns the key
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Returns true.
<big><syntaxhighlight lang="cpp">
void set(const void* Selected);
</syntaxhighlight></big>
Sets _selected to where Selected is pointing to
<big><syntaxhighlight lang="cpp">
bool selected()const;
</syntaxhighlight></big>
Returns Selected
<big><syntaxhighlight lang="cpp">
void selected(bool val);
</syntaxhighlight></big>
Sets _selected to val
<big><syntaxhighlight lang="cpp">
const char* Text();
</syntaxhighlight></big>
Returns the text of Label
===CMenuItem Student Resources===
====CMenuItem Help/Questions Blogs====
{| class="wikitable" border="1"
|-
| Question || Comment
|-
| [http://pankajsama01.blogspot.ca/2013/03/getting-cdirection-error.html Getting Cdirection Error](Pankaj Sama)||
|-
|[http://lhmcintosh.blogspot.ca/2013/03/05-cdialog-issue.html 0.5 CDialog Error] (Lucas McIntosh)|| just put return *_fld[_curidx]; - Glaser
|}
====CMenuItem Blog Posts====
==CText==
CText is a CField to edit a multiline text.<br />
To do this, it will use the [[#The_Text_Helper_Class|Text class]] to convert a character string containing a text into a (simulated) two dimensional array.
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
#include "text.h"
using namespace cio;
class CText:public CField{
Text _T;
bool _displayOnly;
int _curpos;
bool* _insertmode;
int _offset;
int _lcurpos;
int _loffset;
public:
CText(int Row, int Col, int Width, int Height, bool* Insertmode,
bool displayOnly = false, const char* Border=C_BORDER_CHARS);
CText(const char* Str, int Row, int Col, int Width, int Height,
bool* Insertmode, bool displayOnly = false,
const char* Border=C_BORDER_CHARS);
void draw(int fn = C_FULL_FRAME);
void set(const void *Str);
void *data()const;
int edit();
bool editable()const;
bool displayOnly();
void displayOnly(bool val);
};
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
Text _T;
</syntaxhighlight></big>
An instance of the [[#The_Text_Helper_Class|Text class]]
<big><syntaxhighlight lang="cpp">
bool _displayOnly;
</syntaxhighlight></big>
If it is set to true, then the Text can only be viewed but not edited; All scrolling, page UP, DOWN, etc... is enabled but any attempt to change the text, is ignored quietly. This attribute is passed to ReadOnly argument of Console::edit(......).
<big><syntaxhighlight lang="cpp">
int _curpos;
bool* _insertmode;
int _offset;
</syntaxhighlight></big>
Values used by Console::edit(......)
<big><syntaxhighlight lang="cpp">
int _lcurpos;
int _loffset;
</syntaxhighlight></big>
Vertical cursor position in text.
Vertical offset of the text relative to the frame of CText. This value indicates, how many line are hidden above the frame when text is scrolled down.
===Constructors/Destructor===
<big><syntaxhighlight lang="cpp">
CText(int Row, int Col, int Width, int Height, bool* Insertmode,
bool displayOnly = false, const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Initialized the CField with the corresponding incoming arguments and then sets all the attributes to their corresponding arguments.
<big><syntaxhighlight lang="cpp">
CText(const char* Str, int Row, int Col, int Width, int Height,
bool* Insertmode, bool displayOnly = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Works exactly like the previous constructor but it also '''set()'''s the class to '''Str'''.
===Methods===
'''Under Construction'''
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
First it will draw the CField using the fn arguement.<br />
Then it will use console.display to display all the Lines of _T that are positioned inside the frame of the CText. (i.e. from _loffset to _loffset + Height() - 2).<br />
Two Important things to note:
# you should note that '''Lines''' are '''console.display()'''ed from _offset character. (i.e. &_T[theLineNumber][_offset]).
# Also you should '''console.display()''' the Lines only if the length of the line is more than the _offset(i.e. _T[theLineNumver].strlen() > _offset)
<big><syntaxhighlight lang="cpp">
void set(const void *Str);
</syntaxhighlight></big>
Sets the '''_T''' attribute to the incoming string.
<big><syntaxhighlight lang="cpp">
void *data()const;
</syntaxhighlight></big>
Exports the string out of _T and returns its address after casting it to '''void*'''.
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
# Create local variables to hold the following attributes in case ESCAPE is hit to undo:
## _T
## _curpos
## _offset
## _lcurpos
## _loffset
# Create the usual '''while(!done)''' structure for interfacing with user
# '''draw()''' the text
# '''console.edit()''' the Line at where vertical cursor is after _loffset.
## use absRow() and _lcurpos to calculate the row on which the editing should happen
## use absCol() to calculate the column on which editing to happen.
## use width() to calculate the fieldLen for '''console.edit()'''
## use the '''size()''' of the current '''Line''' in '''_T''' to determine the maximum data length of the string to '''console.edit()'''
## the isTextEditor is always true
## the ReadOnly depends on the value of '''_displayOnly'''
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always return true;
<big><syntaxhighlight lang="cpp">
bool displayOnly();
void displayOnly(bool val);
</syntaxhighlight></big>
These methods Get and Set the '''_displayOnly''' attribute.
===The Text Helper Class===
[https://github.com/Seneca-OOP344/20131-notes/tree/master/TextClass Text class]
===CText Student Resources===
====CText Help/Questions Blogs====
====CText Blog Posts====
{| class="wikitable" border="1"
|-
| Question || Comment
|-
|[http://bleulynn.wordpress.com/2013/04/15/ctext/] curpos (Ran)||
|}
==CCheckList==
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
#include "ccheckmark.h"
namespace cio{
class CCheckList : public CField{
CCheckMark* _checkmarks[32];
bool _radio;
char _format[4];
unsigned int _cnt;
unsigned int _flags;
unsigned int _cur;
public:
CCheckList(const char* Format, int Row, int Col, int Width,bool radio, bool Bordered = true,const char* Border=C_BORDER_CHARS);
~CCheckList(void);
CCheckList& add(const char* Text, bool selected = false);
CCheckList& operator<<(const char* Text);
void draw(int fn = C_FULL_FRAME);
int edit();
void* data();
void set(const void* data);
CCheckMark& operator[](unsigned int index);
bool editable()const;
bool radio()const;
void radio(bool val);
unsigned int flags()const;
void flags(unsigned int theFlags);
int selectedIndex()const;
void selectedIndex(int index);
unsigned int length();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
CCheckMark* _checkmarks[32];
</syntaxhighlight></big>
An array of 32 CCheckmark pointers that will point to _cnt dynamically allocated CCheckMarks.
<big><syntaxhighlight lang="cpp">
bool _radio;
</syntaxhighlight></big>
Holds the behaviour of the CCheckList to be like a Radio Button List or Check Mark List
<big><syntaxhighlight lang="cpp">
char _format[4];
</syntaxhighlight></big>
Holds the format with which a check mark is displayed (i.e. "[X]" or "(o)" etc...)
<big><syntaxhighlight lang="cpp">
unsigned int _cnt;
</syntaxhighlight></big>
Holds the number of CCheckMarks currently in CCheckList
<big><syntaxhighlight lang="cpp">
unsigned int _flags;
</syntaxhighlight></big>
Always holds the bit pattern corresponding to the status of the CCheckMarks in the List. Note that bit 0 (right most) will correspond to the first CCheckMark.
<big><syntaxhighlight lang="cpp">
unsigned int _cur;
</syntaxhighlight></big>
Holds the index of the CCheckMark in the "_checkmarks" array which is currently being edited. (focused)
===Constructors/Destructor===
<big><syntaxhighlight lang="cpp">
CCheckList(const char* Format, int Row, int Col, int Width,bool radio, bool Bordered = true,const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Passes corresponding values to the Base class (CField) then
#sets the _data attribute to the address of _flags
#copies '''Format''' and '''radio''' into '''_format''' and '''_radio''' respectively
#sets '''_cnt, _cur''' and '''_flags''' to zero
<big><syntaxhighlight lang="cpp">
~CCheckList(void);
</syntaxhighlight></big>
Goes through '''_checkmarks''' up to '''_cnt''' and if deletes them one by one.
===Methods===
<big><syntaxhighlight lang="cpp">
CCheckList& add(const char* Text, bool selected = false);
</syntaxhighlight></big>
* Only adds a new CCheckMark if '''_cnt''' does not exceed the maximum amount of '''_checkmarks''' (32)
* Creates a new CCheckMark with the row being '''_cnt'''+1, the height being 1 and the length being the length of '''Text'''+4
* Sets the newly created CCheckMarks' frame to '''this'''
* Automatically expands the width of the CCheckList if the width of the newly created CCheckMark is bigger than the current width of the CCheckList
* Sets the height of the CCheckList to '''_cnt'''+3
* Updates the bit pattern of '''_flags'''
* Increments '''_cnt'''
<big><syntaxhighlight lang="cpp">
CCheckList& operator<<(const char* Text);
</syntaxhighlight></big>
returns add(Text).
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
Draws the frame and then draws all the '''_checkmarks''', making sure the cursor is standing under the first checked checkmark.
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
*Draws the '''CCheckList''' then starts editing the '''_checkmarks''' form '''_cur''' and according to the return key of CCheckMark::edit():
**If Down or Right key is hit it goes to the next '''_checkmark''', if '''_cur''' is the last one, then it exits the edit, returning the last key entered.
**UP and Left key works in opposite direction of Down and Right, if '''_cur''' is already zero, then it exits the edit, returning the last key entered.
**If Space is hit, then if '''_radio''' is true, it will uncheck all the '''_checkmarks''' other than the '''_cur'''rent one.
<big><syntaxhighlight lang="cpp">
void* data();
</syntaxhighlight></big>
returns the bit pattern held in _flags. <br />
''make sure _flags are updated to the status of the '''_checkmarks'''''
<big><syntaxhighlight lang="cpp">
void set(const void* data);
</syntaxhighlight></big>
sets the '''_flags''' and updates the '''_checkmarks''' to the bitpattern of '''_flags'''
<big><syntaxhighlight lang="cpp">
CCheckMark& operator[](unsigned int index);
</syntaxhighlight></big>
returns the CCheckMark corresponding the '''index''' value.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
always returns true;
<big><syntaxhighlight lang="cpp">
bool radio()const;
</syntaxhighlight></big>
returns '''_radio'''
<big><syntaxhighlight lang="cpp">
void radio(bool val);
</syntaxhighlight></big>
sets the _radio and updates all _checkMarks radio value.
<big><syntaxhighlight lang="cpp">
unsigned int flags()const;
</syntaxhighlight></big>
returns the '''_flags''' attribute
<big><syntaxhighlight lang="cpp">
void flags(unsigned int theFlags);
</syntaxhighlight></big>
sets the '''_flags''' attribute
<big><syntaxhighlight lang="cpp">
int selectedIndex()const;
</syntaxhighlight></big>
returns the index of the first CCheckMark that is selected, and -1 if nothing is selected.
<big><syntaxhighlight lang="cpp">
void selectedIndex(int index);
</syntaxhighlight></big>
sets the selectedindex. (only un-selects the rest if object is in radio mode)<br />
if index is less than zero, then it will un-selects all
<big><syntaxhighlight lang="cpp">
unsigned int length();
</syntaxhighlight></big>
returns '''_cnt'''
===CCheckList Student Resources===
====CCheckList Help/Questions Blogs====
====CCheckList Blog Posts====
{| class="wikitable" border="1"
|-
| Question || Comment
|-
|Anybody knows how to update the bit pattern of _flags in CCheckList add() method? (Xinggui Deng)||
|-
|You can do: _flags = _flags (bit operator or) (1 << _cnt) ---Gary Chen ||
|-
|[http://kelan-meta.blogspot.ca/2013/04/cchecklist-constructors.html CCheckList constructor question]||
|-
|Also, Brian found out we should use the console.getkey() instead of CCheckMarks::edit() to get the key in edit() function--Gary Chen ||
|-
|[http://kelan-meta.blogspot.ca/2013/04/checked.html Can anyone give me a hint as to why there are garbage symbols after checked option?]|| Thank you for pointing out in your blog that bio::strncpy() does not copy the null byte! I was able to fix my group's clabel.cpp with your help -- Brian Wong (yhwong)
|}
==CMenu and MNode (optional)==
CMenu is a linked list of MNodes. Providing menu selection for the user in two formats; Drop Down List, or a simple menu.
<big><syntaxhighlight lang="cpp">
#ifndef __CIO__CMENU_H__
#define __CIO__CMENU_H__
#include "cuigh.h"
#include "cfield.h"
#include "cmenuitem.h"
#include "cbutton.h"
namespace cio{
class Cmenu;
class MNode{
CMenuItem* _item;
MNode* _next;
MNode* _prev;
unsigned int _index;
MNode(CMenuItem* item,unsigned int index, MNode* prev, MNode* next = ((MNode*)0));
~MNode(void);
friend class CMenu;
};
class CMenu : public CField{
MNode* _first;
MNode* _head;
MNode* _tail;
MNode* _cur;
char _format[3];
unsigned int _cnt;
int _selectedIndex;
bool _dropdown;
bool _dropped;
bool goNext();
bool goPrev();
CButton _Title;
public:
static const bool Select;
CMenu(const char* Title, const char* Format, int Row, int Col,
int Width, int Height,bool dropdown,
const char* Border=C_BORDER_CHARS);
CMenu& add(const char* Text, bool selected = false);
CMenu& operator<<(const char* Text);
CMenu& operator<<(bool select);
void draw(int fn = C_FULL_FRAME);
int edit();
void set(const void* data);
int selectedIndex() const;
int selectedIndex(int index);
const char* selectedText();
bool editable()const;
~CMenu(void);
};
extern const bool Select;
}
#endif
</syntaxhighlight></big>
===MNode===
MNode holds to main about an Item in the menut:
# The CMenuItem object
# The index of this Item
MNode is a fully private class and is only accessible by CMenu.
====Attributes====
<big><syntaxhighlight lang="cpp">
CMenuItem* _item;
</syntaxhighlight></big>
Holds the address of a dynamically allocated CMenuItem
<big><syntaxhighlight lang="cpp">
unsigned int _index;
</syntaxhighlight></big>
Holds the index (sequence -1) number of the '''CMenuItem''' in the '''CMenu'''.
<big><syntaxhighlight lang="cpp">
MNode* _next;
MNode* _prev;
</syntaxhighlight></big>
Standard next and previous pointer for a linked list node.
====Constructor/Destructor====
<big><syntaxhighlight lang="cpp">
MNode(CMenuItem* item,unsigned int index, MNode* prev, MNode* next = ((MNode*)0));
</syntaxhighlight></big>
Sets the corresponding attributes to the values of the arguments.
<big><syntaxhighlight lang="cpp">
~MNode(void);
</syntaxhighlight></big>
deletes the '''_item'''
===CMenu===
CMenu is a linked list of MNodes and also contains a CButton for a Title (only used on if in '''_dropdown''' mode). <br />
Assuming that a CMenu is created with a title as "FILE" and menu-items as "Save, Load, Print, Quit":
*When in '''_dropdown''' mode:
When drawing, Only the _Title(CButton) is drawn (and not the menu itself)
<big><pre>
FILE
</pre></big>
When edited (in '''_dropdown''' mode) the CButton gets activated and if it is hit, then the Menu will be dropped down (drawn) under the CButton and user can browse through the options and select one of them. selecting the option in this case will close the menu and CButton gets activated again:<br />
when active, CMenu looks like this:
<big><pre>
[FILE]
</pre></big>
User hits enter: (since nothing is selected all menu items are unselected)
<big><pre>
FILE
/-------\
| Save |
| Load |
| Print |
| Quit |
\-------/
</pre></big>
Now the cursor is standing under '''S'''ave.
User hits down arrow twice to select '''P'''rint and then hits Space:
<big><pre>
[FILE]
</pre></big>
The Print is selected and The menu is closed and FILE is active again.
If the user hits Enter again:
<big><pre>
FILE
/-------\
| Save |
| Load |
|[Print]|
| Quit |
\-------/
</pre></big>
We will see the Print is selected and the cursor in under P.
If user hits Enter instead of space, the selection wont change and whatever was selected before will remain the same:
<big><pre>
[FILE]
</pre></big>
User hits navigation keys and moves out of the CMenu Field.
''Note that if '''left''' or '''right''' navigation keys are hit when the title is active, then they are translated to '''up''' or '''down''' respectively.
*When NOT in '''_dropdown''' mode:
*:The CButton will not be displayed at all, and when user starts to edit, he enters the menu browsing the items and if he gets to the end of the menu, the control goes to the next field in the dialog. If user goes up and passes the first them, then the control will go to the previous field in the dalog.
<big><pre>
/-------\
| Save |
| Load |
|[Print]|
| Quit |
\-------/
</pre></big>
''Note that if the number of menu items are more than the space provided by the CField's frame, then the menu items should scroll up and down to accommodate the selection''
====Attributes====
<big><syntaxhighlight lang = "cpp">
MNode* _first;
</syntaxhighlight></big>
points to the first CMenuItem visible on the menu.
<big><syntaxhighlight lang = "cpp">
MNode* _head;
MNode* _tail;
MNode* _cur;
</syntaxhighlight></big>
standard Link list pointers
<big><syntaxhighlight lang = "cpp">
char _format[3];
</syntaxhighlight></big>
The two characters used to surround the selected menu item
<big><syntaxhighlight lang = "cpp">
unsigned int _cnt;
</syntaxhighlight></big>
The number of CMenuItems in CMenu
<big><syntaxhighlight lang = "cpp">
int _selectedIndex;
</syntaxhighlight></big>
The index of the selected CMenuItem (saved in MNode::index), if there is no selected menu, then this value is -1.
<big><syntaxhighlight lang = "cpp">
bool _dropdown;
</syntaxhighlight></big>
True if the Menu is a Drop Down Menu.
<big><syntaxhighlight lang = "cpp">
bool _dropped;
</syntaxhighlight></big>
Flag used to hold the status of a Drop Down Menu, (_dropped or not)
<big><syntaxhighlight lang = "cpp">
bool goNext();
bool goPrev();
</syntaxhighlight></big>
standard gonext() and goprev() in linked lists
<big><syntaxhighlight lang = "cpp">
CButton _Title;
</syntaxhighlight></big>
CButton holding the Title of this menu
====Constructor/Destructor====
<big><syntaxhighlight lang = "cpp">
CMenu(const char* Title, const char* Format, int Row, int Col,
int Width, int Height,bool dropdown,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
#Initializes CField as follows:
#* Row: Passes Row, if this menu is not a dropdown, otherwise it will pass Row+1.
#* Col, Width, Height are passed directly
#* Data: a void null pointer is passed for data
#* Bordered: since CMenu is always bordered, true is passed here
#* Border is directly passed.
#Initializes _Title (the CButton) as follows:
#* Str, Title is passed here
#* Row, -1
#* Col, 1
#* Bordered, since the title of the dorpdown is alway NOT bordered, then false is passed here.
#Constructor Settings:
#* Link list attributes are set as standard linked list contructor
#* Format is copied into _format
#* _cnt is set to zero
#* _selectedIndex is set to -1
#* _data is set to address of _selectedIndex
#* _dropdown is set to dropdown
#* _dropped is set to false
#* _Title's frame is set to the CMenu object (this)
<big><syntaxhighlight lang = "cpp">
~CMenu();
</syntaxhighlight></big>
Standard Linked list destructor
====Methods====
<big><syntaxhighlight lang = "cpp">
CMenu& add(const char* Text, bool selected = false);
</syntaxhighlight></big>
Standard append for a linked list:
#creates an MNode with
#* a new CMenutItem with
#*:selected, _format, Text for first three arguments
#*:1, 1, and (width of the menu) -2, for Row col and width
#* the rest are what is needed for a standard append procedure for a linked list
#appends the new MNode to the end of the list
#if the new added CMenuItem is selected, it will update the selected index
'''''Note that if the added CMenuItem is the first CMenuItem in the list, then the _first pointer should be pointing to it'''''
<big><syntaxhighlight lang = "cpp">
CMenu& operator<<(const char* Text);
</syntaxhighlight></big>
returns add(Text)
<big><syntaxhighlight lang = "cpp">
CMenu& operator<<(bool select);
</syntaxhighlight></big>
if select is true, it will select the last CMenuItem added to the CMenu
<big><syntaxhighlight lang = "cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
#if this is a '''_dropdown''', then it will draw the _Title
#: and then if '''_dropped''' is true, it will draw the CField and then draw the CMenuItems starting form what _first is pointing to, up to (CField's hieght -2) times.
#if this not a '''_dropdown''' then the _Title will never be drawn and the CMenuItems should be drawn as above.
<big><syntaxhighlight lang = "cpp">
int edit();
</syntaxhighlight></big>
Edits the menu the way it is explains in [[#CMenu|CMenu]] description.<br />
If it is too confusing, this [[CMenu pseudo code - OOP344 20113|pseudo code]] may help.
<big><syntaxhighlight lang = "cpp">
void set(const void* data);
</syntaxhighlight></big>
Sets the selected index to the integer pointed by data;
<big><syntaxhighlight lang = "cpp">
int selectedIndex() const;
</syntaxhighlight></big>
returns the selected index or -1 if nothing is selected
<big><syntaxhighlight lang = "cpp">
int selectedIndex(int index);
</syntaxhighlight></big>
sets the selected index.
<big><syntaxhighlight lang = "cpp">
const char* selectedText();
</syntaxhighlight></big>
returns the text of the selected menu, if nothing is selected, and empty string is returned.
<big><syntaxhighlight lang = "cpp">
bool editable()const;
</syntaxhighlight></big>
returns true if '''_cnt''' is greater than zero
===CMenu Student Resources===
====CMenu Help/Questions Blogs====
====CMenu Blog Posts====
==Objective==
Your objective at this stage is to create series of core classes designed to interact with the user. These '''Core Classes''' then can be used in development of any interactive application.
Please note that the class definitions here are minimum requirement for the Core Classes and you are free to add any enhancements or features you find useful. However make sure that you discuss these enhancements with your team and professor to make sure they are feasible before implementation.
It is highly recommended to develop the classes in the order they are stated here. You must create your own tester programs for each class (if possible); However, close to due date of each release, a tester program may be provided to help you verify the functionality of your classes. If tester programs are provided, then executables of the test programs will be available on matrix to show you how it is supposed to run.
Also object your professor's implementation of all the classes are available in your class notes repository. Please note the following:
* these implementations include a header file for each class and an object file for each class and platform
* these are for you to test your own implementation in case you need to have access to another class and they are not developed yet.
* like any other implementation, these implementations could be buggy
==Tips==
* [[GIT for OOP344 Projects| Guide for using Github]]
Start by creating mock-up classes (class declaration and definition with empty methods that only compiles and don't do anything).
Each class MUST have its own header file to hold its declaration and "cpp" file to hold its implementation. To make sure you do not do circular includes follow these simple guidelines:
* Add recompilation safeguards to all your header files.
* Always use forward declaration if possible instead of including a class header-file.
* Use includes only in files in which the actual header file code is used.
* '''Avoid "just in case" includes.'''
=CUI General Header file (cuigh.h)=
The general header file holds the common setting and definition between all the Core Classes. Review this header file at each stage of the project for changes.
<big><syntaxhighlight lang="cpp">
#ifndef ___CUIGH_H__
#define ___CUIGH_H__
namespace cio{
#ifndef _CRT_SECURE_NO_DEPRECATE
#define _CRT_SECURE_NO_DEPRECATE
#endif
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#define C_INITIAL_NO_FIELDS 50
#define C_DIALOG_EXPANSION_SIZE 20
#define C_BUTTON_HIT 1
#define C_MAX_LINE_CHARS (1024u)
#define C_REFRESH -2
#define C_FULL_FRAME -1
#define C_NO_FRAME 0
#define C_BORDER_CHARS "/-\\|/-\\|"
enum CDirection {centre, left, right, up, down};
// added after 0.3:
enum MessageStatus{ClearMessage,SetMessage};
#ifdef NO_HELPFUNC
# undef NO_HELPFUNC
#endif
#define NO_HELPFUNC ((void(*)(MessageStatus, CDialog&))(0))
#ifdef NO_VALDFUNC
# undef NO_VALDFUNC
#endif
#define NO_VALDFUNC ((bool(*)(const char*, CDialog&))(0))
#define C_MAX_LINE_CHARS (1024u)
#define C_INITIAL_NUM_OF_LINES (100u)
}
#endif
</syntaxhighlight></big>
==File Names==
Use the following rules to create filenames for your class.
*Each class MUST have its own header file and cpp file for implementation
*Use the class name for the name of the file but make sure it is all '''''lowercase'''''.
*:For example '''CFrame''' class should have '''cframe.h''' and '''cframe.cpp''' files for its implementation.
==Hierarchy==
<big><pre>
CFrame
|
|---CDialog
|
|
|---CField
|
|-------- CLabel
|
|
|-------- CButton
|
|
|-------- CLineEdit
| |
| |-------CValEdit
|
|-------- CText
|
|
|-------- CCheckMark
|
|
|-------- CCheckList
|
|
|-------- CMenuItem
|
|
|-------- CMenu
</pre></big>
==Issues, Releases and Due Dates==
*Issue Name Format
*:Issue and branch name format:<br />
V.V_Name <br />
example; issue: Add Text Class to the project (issue 2.9.1) issue and branch name on gitub: 2.9.1_AddTextClass<br />
=== 0.2 Milestone ===
# Add Console Class to the repo and test it with cio_test.cpp and Test1Frame.cpp.
# Create Mock-up classes
## CLabel Mock-up Class (issue 2.2)
## CDialog Mock-up Class (issue 2.3)
## CLineEdit Mock-up Class (issue 2.4)
## CButton Mock-up Class (issue 2.5)
====Details====
[[OOP344 0.2 Milestone 20131|0.2 milestone details]]
====Due Date====
Thursday Feb, 14th, 23:59
=== 0.3 Milestone ===
# Apply changes to CDialog, cuigh.h and update and test your related mock-ups. (issue 3.1)
# CLabel Implementation (issue 3.2)
# CDialog Implementation (issue 3.3)
# CLineEdit Implementation (issue 3.4)
# CButton Implementation (issue 3.5)
====Details====
====Due Date====
Wednesday March, 6th, 23:59
=== 0.5 Milestone ===
# All mock-ups (issue 5.1)
# CValEdit Implementation (issue 5.2)
# CCheckMark Implementation (issue 5.3)
# CMenuItem Implementation (issue 5.4)
====Details====
====Due Date====
Thursday March, 28th, 23:59
=== 0.8 and 0.9(optional) Milestone ===
# CText Implementation (issue 8.1)
# CCheckList Implementation (issue 8.2)
# CMenu Implementation (issue 9.1)
====Details====
====Due Date====
Saturday April, 6th, 23:59
=== 1.0 Milestone ===
# The application
====Details====
====Due Date====
Saturday April, 13th, 23:59
==CFrame==
The code for this class is provided in your repository. You must understand and use it to develop your core classes in your repository.
CFrame class is responsible to create a frame or structure in which all user interface classes contain themselves in. It can draw a border around it self or be border-less.
CFrame also, before displaying itself on the screen, will save the area it is about to cover, so it can redisplay them to hide itself.
CFrame is base of all objects in our user interface system.
<big><syntaxhighlight lang="cpp">
#include "cuigh.h"
class CFrame{
int _row; // relative row of left top corner to the container frame or the screen if _frame is null
int _col; // relative col of left top corner to the container frame or the screen if _frame is null
int _height;
int _width;
char _border[9]; // border characters
bool _visible; // is bordered or not
CFrame* _frame; // pointer to the container of the frame (the frame, surrounding this frame)
char* _covered; // pointer to the characters of the screen which are covered by this frame, when displayed
void capture(); // captures and saves the characters in the area covered by this frame when displayed and sets
// _covered to point to it
void free(); // deletes dynamic memory in the _covered pointer
protected:
int absRow()const;
int absCol()const;
public:
CFrame(int Row=-1, int Col=-1, int Width=-1,int Height=-1,
bool Visible = false,
const char* Border=C_BORDER_CHARS,
CFrame* Frame = (CFrame*)0);
virtual void draw(int fn=C_FULL_FRAME);
virtual void move(CDirection dir);
virtual void move();
virtual void hide();
virtual ~CFrame();
/* setters and getters: */
bool fullscreen()const;
void visible(bool val);
bool visible()const;
void frame(CFrame* theContainer);
CFrame* frame();
void row(int val);
int row()const;
void col(int val);
int col()const;
void height(int val);
int height()const;
void width(int val);
int width()const;
void refresh();
};
</syntaxhighlight></big>
===Properties===
int _row, holds the relative coordinate of top row of this border with respect to its container.<br />
int _col, same as _row, but for _col. <br />
int _height, height of the entity. <br />
int _width, width of the entity. <br />
char _border[9], characters used to draw the border: <br />
: _border[0], left top
: _border[1], top side
: _border[2], right top
: _border[3], right side
: _border[4], right bottom
: _border[5], bottom side
: _border[6], bottom left
: _border[7], left side
bool _visible; Indicates if the border surrounding the entity is to be drawn or not. <br />
CFrame* _frame; holds the container (another CFrame) which has opened this one (owner or container of the current CFrame). '''_frame''' will be NULL if this CFrame does not have a container, in which case, it will be full screen and no matter what the values of row, col, width and height are, CFrame will be '''Full Screen''' (no border will be drawn)<br />
char* _covered; is a pointer to a character array that hold what was under this frame before being drawn. When the CFrame wants to hide itself, it simple copies the content of this array back on the screen on its own coordinates.
===Methods and Constructors===
====Private Methods====
<big><syntaxhighlight lang="cpp">
void capture();
</syntaxhighlight></big>
:if _covered pointer is not pointing to any allocated memory, it will call the iol_capture function to capture the area that is going to be covered by this frame and keeps its address in _covered.
====Protected Methods====
*int absRow()const; calculates the absolute row (relative to the left top corner of the screen) and returns it.
*:it returns the sum of '''row()''' of this border plus all the '''row()'''s of the '''_frame'''s
*int absCol()const; calculates the absolute column(relative to the left top corner of the screen) and returns it.
*:it returns the sum of '''col()''' of this border plus all the '''col()'''s of the '''_frame'''s
====Public Methods====
<big><syntaxhighlight lang="cpp">
CFrame(int Row=-1, int Col=-1, int Width=-1,int Height=-1,
bool Visible = false,
const char* Border=C_BORDER_CHARS,
CFrame* Frame = (CFrame*)0);
</syntaxhighlight></big>
:Sets the corresponding attributes to the incoming values in the argument list and set _covered to null
<big><syntaxhighlight lang="cpp">
virtual void draw(int fn=C_FULL_FRAME);
</syntaxhighlight></big>
* First it will '''capture()''' the coordinates it is supposed to cover
* If frame is '''fullscreen()''' then it just clears the screen and exits. <br />
Otherwise:<br />
*If the _visible flag is true, it will draw a box at _row and _col, with size of _width and _height using the _border characters and fills it with spaces. Otherwise it will just draw a box using spaces at the same location and same size.
<big><syntaxhighlight lang="cpp">
virtual void move(CDirection dir);
</syntaxhighlight></big>
First it will hide the Frame, then adjust the row and col to move to the "dir" direction and then draws the Frame back on screen.
<big><syntaxhighlight lang="cpp">
virtual void hide();
</syntaxhighlight></big>
using iol_restore()it restores the characters behind the Frame back on screen. It will also free the memory pointed by _covered;
<big><syntaxhighlight lang="cpp">
virtual ~CFrame();
</syntaxhighlight></big>
It will make sure allocated memories are freed.
<big><syntaxhighlight lang="cpp">
bool fullscreen()const;
void visible(bool val);
bool visible()const;
void frame(CFrame* theContainer);
CFrame* frame();
void row(int val);
int row()const;
void col(int val);
int col()const;
void height(int val);
int height()const;
void width(int val);
int width()const;
</syntaxhighlight></big>
These functions set and get the attributes of the CFrame.
===CFrame Student Resources===
====CFrame Help/Questions Blogs====
====CFrame Blog Posts====
==CField==
CField is an abstract base class that encapsulates the commonalities of all Input Outputs Console Fields which are placeable on a CDialog. All Fields could be Framed, therefore a CField is inherited from CFrame.
<big><syntaxhighlight lang="cpp">
#include "cframe.h"
class CDialog;
class CField : public CFrame{
protected:
void* _data;
public:
CField(int Row = 0, int Col = 0,
int Width = 0, int Height =0,
void* Data = (void*) 0,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
~CField();
virtual int edit() = 0;
virtual bool editable() const = 0;
virtual void set(const void* data) = 0;
virtual void* data()const; //<== check this, not sure
void container(CDialog* theContainer);
CDialog* container();
};
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
void* _data;
</syntaxhighlight></big>
Will hold the address of any type of data a CField can hold.
===Constructors and Methods===
<big><syntaxhighlight lang="cpp">
CField(int Row = 0, int Col = 0,
int Width = 0, int Height =0,
void* Data = (void*) 0,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Passes the corresponding attributes to it's parents (CFrame) constructor and then sets the _data attribute to the incoming Data argument. Also using '''container(CDialog* theContainer)''' it set the container to NULL.
<big><syntaxhighlight lang="cpp">
~CField();
</syntaxhighlight></big>
Empty Destructor
<big><syntaxhighlight lang="cpp">
virtual int edit() = 0;
virtual bool editable() const = 0;
virtual void set(const void* data) = 0;
</syntaxhighlight></big>
Pure virtual methods to enforce the children to implement;
* an edit() method
* an editable() method that returns true if the class is to edit data and false if the class is to only display data.
* a set() method to set the _data attribute to the data the class is to work with.
<big><syntaxhighlight lang="cpp">
virtual void* data() const; <--- Check this not sure....
</syntaxhighlight></big>
Returns _data.
<big><syntaxhighlight lang="cpp">
void container(CDialog* theContainer);
</syntaxhighlight></big>
Casts '''"theContainer"''' to a CFrame pointer and passes it to CFrame::frame(CFrame*) method; (to set the frame of CDialog)
<big><syntaxhighlight lang="cpp">
CDialog* container();
</syntaxhighlight></big>
Casts the return value of CFrame::frame() to a CDialog pointer and returns it.
===CField Student Resources===
====CField Help/Questions Blogs====
====CField Blog Posts====
==CLabel==
A readonly Field that encapsulates console.display() function. (i.e it is responsible to display a short character string on the display) CLabel although, by inheritance is Frame, but it is never '''bordered'''.
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
class CLabel : public CField{
// for length of the field:
// Use void CFrame::width(int) to store length, and int CFrame::width() to retrieve the length
public:
CLabel(const CLabel& L);
CLabel(const char *Str, int Row, int Col,
int Len = 0);
CLabel(int Row, int Col, int Len);
~CLabel();
void draw(int fn=C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* str);
};
</syntaxhighlight></big>
===Attributes===
No attributes, (use Cframe attributes)
===Constructors / Destructor ===
<big><syntaxhighlight lang="cpp">
CLabel(const char *Str, int Row, int Col,
int Len = 0);
</syntaxhighlight></big>
passes the Row and Col to the CField constructor and then;
if len is zero, it will allocate enough memory to store the string pointed by Str and then copies the Str into it.
if len > 0, then it will allocate enough memory to store '''len''' chars, copying only len characters of str.
In any way, the allocated memory is pointed by '''_data'''. Also it will set the width to the length of the memory allocated.
<big><syntaxhighlight lang="cpp">
CLabel(int Row, int Col, int Len);
</syntaxhighlight></big>
Works exactly like the previous constructor, but len in this case can not be zero. (no validation required) and the string pointed by _data will be set to an empty string.
<big><syntaxhighlight lang="cpp">
CLabel(const CLabel& L);
</syntaxhighlight></big>
Copies a CLabel safely to guaranty there is no memory leak.
<big><syntaxhighlight lang="cpp">
~CLabel();
</syntaxhighlight></big>
makes sure that memory pointed by _data is deallocated before the object is destroyed.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn=C_NO_FRAME) ;
</syntaxhighlight></big>
makes a direct call to console.display(), passing '''_data''' for the string to be printed and absRow() and absCol() for row and col and _length for len.
this function ignores the argument fn.
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
calls draw, returning 0.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
always return false.
<big><syntaxhighlight lang="cpp">
void set(const void* str);
</syntaxhighlight></big>
if width() is greater than zero, it will copy the string pointed by str into the string pointed by _data upto width characters.
if width() is zero,<br /> It will delete the memory pointed by _data and reallocates enough memory for str and copies the string pointed by str into the newly allocated memory pointed by _data.
===CLabel Student Resources===
====CLabel Help/Questions Blogs====
====CLabel Blog Posts====
==CDialog==
Organizes CField objects on the screen, displays them and then lets the user edit them one by one.
<big><syntaxhighlight lang="cpp">
#include "cuigh.h"
#include "cframe.h"
namespace cio{
class CField;
class CDialog: public CFrame{
private:
int _fnum;
int _curidx;
CField** _fld;
bool* _dyn;
bool _editable;
unsigned int _fldSize;
public:
CDialog(CFrame *Container = (CFrame*)0,
int Row = -1, int Col = -1,
int Width = -1, int Height = -1,
bool Borderd = false,
const char* Border=C_BORDER_CHARS);
virtual ~CDialog();
void draw(int fn = C_FULL_FRAME);
int edit(int fn = C_FULL_FRAME);
int add(CField* field, bool dynamic = true);
int add(CField& field, bool dynamic = false);
CDialog& operator<<(CField* field);
CDialog& operator<<(CField& field);
bool editable();
int fieldNum()const;
int curIndex()const;
CField& operator[](unsigned int index);
CField& curField();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
int _fnum;
</syntaxhighlight></big>
Holds the number of Fields added to the Dialog
<big><syntaxhighlight lang="cpp">
bool _editable;
</syntaxhighlight></big>
will be set to true if any of the Fields added are editable.
This is optional because it depends on how you are going to implement the collection of CFields:
<big><syntaxhighlight lang="cpp">
int _curidx;
</syntaxhighlight></big>
Holds the index of the Field that is currently being edited.
<big><syntaxhighlight lang="cpp">
CField** _fld;
</syntaxhighlight></big>
Dynamic array of CField pointers to hold the address of the CField objects added to the screen. The initial size of the array allocation is defined in '''''cuigh.h''''' under C_INITIAL_NO_FIELDS.
<big><syntaxhighlight lang="cpp">
bool* _dyn;
</syntaxhighlight></big>
A dynamic bool array that holds series of booleans to the exact number of fields, and each boolean here will hold false if the corresponding field pointed by _fld is allocated dynamically or not. The initial size of the array allocation is defined in '''''cuigh.h''''' under C_INITIAL_NO_FIELDS. <br />
This array will later on be used by destructor to decide which object is dynamic and to be deleted.
<big><syntaxhighlight lang="cpp">
unsigned int _fldSize;
</syntaxhighlight></big>
Holds the current length of '''''_fld''''' and '''''_dyn'''''. <br />When adding a field to dialog if '''_fum''' reaches '''_fldSize''', then the size of '''_fld''' and '''_dyn''' is expanded by '''''C_DIALOG_EXPANSION_SIZE''''', defined in '''cuigh.h'''
===Constructors/Destructors===
<big><syntaxhighlight lang="cpp">
CDialog(CFrame *Container = (CFrame*)0,
int Row = -1, int Col = -1,
int Width = -1, int Height = -1,
bool Borderd = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
The constructor passes all the incoming arguments to the corresponding arguments of the apparent constructor '''CFrame'''.<br />
Then it will set all called attributes to their default values and then sets all the field pointers (_fld) to NULL.
It also sets all the dynamic (_dyn) flags to false.
<big><syntaxhighlight lang="cpp">
virtual ~CDialog();
</syntaxhighlight></big>
The destructor will loop through all the field pointers and if the corresponding dynamic flag is true then it will delete the field pointed to by the field pointer.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
If '''fn''' is '''C_FULL_FRAME''', it will call its parent draw. Then It will draw all the '''Fields''' in the '''Dialog'''. <br />
If '''fn''' is Zero, then it will just draw all the '''Fields''' in the '''Dialog'''.<br />
If '''fn''' is a non-zero positive value, then it will only draw '''Field''' number '''fn''' in the dialog. (First added '''Field''' is field number one.)
<big><syntaxhighlight lang="cpp">
int edit(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
If '''CDialog''' is not editable (all fields are non-editable), it will just display the Dialog and then waits for the user to enter a key and then terminates the function returning the key.<br />
If fn is '''0''' or less, then before editing, the draw method is called with '''fn''' as its argument and then editing begins from the first editable Field.
If fn is greater than '''0''' then editing begins from the first editable key on or after Field number '''fn'''.
Note that fn is the sequence number of field and not the index. (First field number is one)
Start editing from field number '''fn''';
Call the edit of each field and depending on the value returned, do the following:<br />
# For '''ENTER_KEY''', '''TAB_KEY''' and '''DOWN_KEY''', go to next editable Field , if this is the last editable Field then restart from Field number one.
# For '''UP_KEY''' go to the previous editable Field, if there is no previous editable Field, go to the last editable Field in the Dialog.
# For any other key, terminate the edit function returning the character which caused the termination.
<big><syntaxhighlight lang="cpp">
int add(CField* field, bool dynamic = true);
</syntaxhighlight></big>
First, this function will check the value of _fnum. If '''_fnum''' has reached '''_fldSize''', ('''_fld''' and '''_dyn''' arrays are full) it will expand '''_fld''' and '''_dyn''' by '''C_DIALOG_EXPANSION_SIZE''' (defined in '''cuigh.h''') to make room for more '''CField'''.<br />
Then, it adds the CField pointed by '''field''' to the Fields of the Dialog; by appending the value of the field pointer after the last added ''field'' in the _fld array , setting the corresponding _dyn element to the value of dynamic argument and then increasing _fnum by one and returning the index of added Field in the CDialog object.<br />
'''important note:'''<br />
Make sure that add() sets the container of the added CField to this CDialog object, using the container() method of CField<br />
Also make sure, if size of _fld and _dyn are expanded, then _fldSize is also increased.
<big><syntaxhighlight lang="cpp">
int add(CField& field, bool dynamic = false);
</syntaxhighlight></big>
Makes a direct call to the first add method.
<big><syntaxhighlight lang="cpp">
CDialog& operator<<(CField* field);
</syntaxhighlight></big>
Makes a direct call to the first add method, ignoring the second argument and then returns the owner (current CDialog).
<big><syntaxhighlight lang="cpp">
CDialog& operator<<(CField& field);
</syntaxhighlight></big>
Makes a direct call to the second add method, ignoring the second argument and then returns the owner (current CDialog).
<big><syntaxhighlight lang="cpp">
bool editable();
</syntaxhighlight></big>
Returns '''_editable''';
<big><syntaxhighlight lang="cpp">
int fieldNum()const;
</syntaxhighlight></big>
returns '''_fnum'''.
<big><syntaxhighlight lang="cpp">
int curIndex()const;
</syntaxhighlight></big>
returns '''_curidx''';
<big><syntaxhighlight lang="cpp">
CField& operator[](unsigned int index);
</syntaxhighlight></big>
Returns the reference of the Field with incoming index. (Note that here, the first field index is '''0''')
<big><syntaxhighlight lang="cpp">
CField& curField();
</syntaxhighlight></big>
Returns the reference of the Field that was just being edited.
===CDialog Student Resources===
====CDialog Help/Questions Blogs====
does anyone know the meaning of the following sentence?if you know,feedback as soon as possible
int add(CField* field, bool dynamic = true);
Make sure that add() sets the container of the added CField to this CDialog object, using the container() method of CField(vivek patel)
====CDialog Blog Posts====
==CLineEdit==
'''ClineEdit''' encapsulates the console.edit() function of Console class.
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
namespace cio{
class CLineEdit: public CField{
bool _dyn;
int _maxdatalen;
bool* _insertmode;
int _curpos;
int _offset;
public:
CLineEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CLineEdit(int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
~CLineEdit();
void draw(int Refresh = C_FULL_FRAME);
int edit();
bool editable()const;
void set(const void* Str);
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
bool _dyn;
</syntaxhighlight></big>
_dyn is set to true if the object dynamically allocated memory and is responsible to free it at destruction time.
<big><syntaxhighlight lang="cpp">
int _maxdatalen;
</syntaxhighlight></big>
no comment!
<big><syntaxhighlight lang="cpp">
bool* _insertmode;
</syntaxhighlight></big>
points to the location of input method (insert or overstrike)
<big><syntaxhighlight lang="cpp">
int _curpos;
</syntaxhighlight></big>
current position of cursor
<big><syntaxhighlight lang="cpp">
int _offset;
</syntaxhighlight></big>
current offset
===Constructors / Destructor===
<big><syntaxhighlight lang="cpp">
CLineEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, int* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
LineEdit, sets the Field's _data to the value of str. If LineEdit is instantiated with this constructor then it will edit an external string provided by the caller function of LineEdit. LineEdit in this case is not creating any dynamic memory, therefore _dyn is set to false (therefore the destructor will not attempt to deallocate the memory pointed by _data).<br />
The location (row and col) and Bordered are directly passed to the parent (CField) and str is passed as data to the parent constructor. Unlike Label, LineEdit could have border or not so depending on this (Bordered being true or false) the Height is set to 3 or 1 respectfully. <br />
(hint: use '''? :''' operator to pass the proper Height value to CField's constructor)
<big><syntaxhighlight lang="cpp">
CLineEdit(int Row, int Col, int Width,
int Maxdatalen, int* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Works exactly like the previous constructor with one difference; since no external data is passed to be edited here, this constructor must allocate enough dynamic memory to accommodate editing of '''Maxdatalen''' characters. Then make it an empty string and set Fields's _data to point to it. Make sure _dyn is set to true in this case, so the destructor knows that it has to deallocate the memory at the end.
<big><syntaxhighlight lang="cpp">
~CLineEdit();
</syntaxhighlight></big>
If '''_dyn''' is true, it will deallocate the character array pointed by Fields's '''_data'''
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int Refresh = C_FULL_FRAME);
</syntaxhighlight></big>
It will first call Frame's draw passing '''Refresh''' as an argument to it.<br />
Then it will make a direct call to console.display() to show the data kept in Field's '''_data'''.<br />
The values used for the arguments of console.display() are:
*str: address of string pointed by _data + the value of _offset
*row: absRow() (''add one if border is visible'')
*col: absCol() (''add one if border is visible'')
*len: width() (''reduce by two if border is visible''')
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
Makes a direct call to, and returns '''console.edit()'''.
For the coordinates and width arguments follow the same rules as the draw function.
For the rest of the arguments of console.edit(), use the attributes of '''CLineEdit'''.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always return true;
<big><syntaxhighlight lang="cpp">
void set(const void* Str);
</syntaxhighlight></big>
Copies the characters pointed by '''Str''' into the memory pointed by Field's '''_data''' up to '''_maxdatalen''' characters.
===CLineEdit Student Resources===
====CLineEdit Help/Questions Blogs====
*Does anyone know that what value I have to assign to _offset and _curpos for CLineEdit attribute since there is no value passed by the constructor? Chun Chen
----> _offset and _curpos are set to 0. -Koghulan Namasivayam
====CLineEdit Blog Posts====
==CButton==
Button is a child of CField.
It displays a small piece of text (usually one word or two) and accepts one key hit entry.
When in edit mode, to indicate the editing mode, it will surround the text with squared brackets.
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
namespace cio{
class CButton: public CField{
public:
CButton(const char *Str, int Row, int Col,
bool Bordered = true,
const char* Border=C_BORDER_CHARS);
virtual ~CButton();
void draw(int rn=C_FULL_FRAME);
int edit();
bool editable()const;
void set(const void* str);
};
}
</syntaxhighlight></big>
===Attributes===
This class does not have any attributes of its own!
===Constructor / Destructor===
<big><syntaxhighlight lang="cpp">
CButton(const char *Str, int Row, int Col,
bool Bordered = true,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
When creating a Button, allocate enough memory to hold the contents of the '''Str''' and set Field's _data to point to it. Then copy the content of '''Str''' into the newly allocated memory.<br />
Pass all the arguments directly to Field's constructor.<br />
For Field size (width and hight) do the following:<br />
For width: Set width to the length of '''Str''' + 2 (adding 2 for surrounding brackets) or if the Button is bordered set width to the length of '''Str''' + 4 (adding 2 for surrounding brackets and 2 for the borders).
For height: Set the height to 1 or if the Button is bordered, set the height to 3.
<big><syntaxhighlight lang="cpp">
virtual ~CButton();
</syntaxhighlight></big>
Deallocates the allocated memory pointed by Field's '''_data'''.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn=C_FULL_FRAME);
</syntaxhighlight></big>
Draws the Button with border around it if it is Bordered. Note that there should be a space before and after of the text that will be used to surround the text with "[" and "]"<br />
hint:<br />
:*First calls Frame's draw(fn) (passing the fn argument to the parents draw)
:Use console.display() to display the Button's text (pointed by Field's _data)
:*If not bordered
:*:display the text at absRow() and absCol()
:*If bordered
:*:display the text at absRow()+1 and absCol()+2
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
First draw() the Button, then surround it by squared brackets, place the cursor under the first character of Button's text and wait for user entry.<br />
When user hits a key, if the key is ENTER_KEY or SPACE, return C_BUTTON_HIT (defined in cuigh.h) otherwise return the entered key.<br />
<big><syntaxhighlight lang="cpp">
void set(const void* str);
</syntaxhighlight></big>
First deallocated what is pointed by Field's _data.
Then allocate new memory to the size of content of str and copy the content into it and make
Field's _data point to it.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always returns true
===CButton Student Resources===
====CButton Help/Questions Blogs====
[http://pankajsama01.blogspot.ca/2013/03/cbuttonhit-key.html C_BUTTON_HIT Key] is not defined(Pankaj Sama)
** It is defined in the new cuigh.h file. It is defined #define C_BUTTON_HIT 1. Gary Chen
====CButton Blog Posts====
==CValEdit==
This class works exactly like CLineEdit and improves it by adding two features; Validation and Help. CValEdit is capable of validating the user input on exit and also provide help when CValEdit::edit() is active by invoking a '''"help"''' method before and after editing. If these two functions, (Validation and Help) are not provided, then CValEdit literally works like CLineEdit.
<big><syntaxhighlight lang="cpp">
#include "clineedit.h"
namespace cio{
class CValEdit: public CLineEdit{
void (*_help)(MessageStatus, CDialog&);
bool (*_validate)(const char*, CDialog&);
public:
CValEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CValEdit(int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
int edit();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
void (*_help)(MessageStatus, CDialog&);
bool (*_validate)(const char*, CDialog&);
</syntaxhighlight></big>
*_help, holds the address of the help logic (function) or NULL if there is no help function is assigned
*_validate, holds the address of the validation logic (function) or NULL if there is no validation function is assgned
===Constructors===
<big><syntaxhighlight lang="cpp">
CValEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CValEdit(int Row, int Col, int Width,
int Maxdatalen, bool* Insertmode,
bool (*Validate)(const char* , CDialog&) = NO_VALDFUNC,
void (*Help)(MessageStatus, CDialog&) = NO_HELPFUNC,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
These constructors pass all their arguments to corresponding arguments of CLineEdit constructor and then set '''_help''' and '''_validate''' attributes to the corresponding incoming arguments
===Method===
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
If the container() is NULL then this function works exactly like LineEdit::edit().<br />
If the container() is not NULL:
#If _help function exist, it calls the function passing MessageStatus::SetMessage and container()'s reference as arguments.
#Calls CLineEdit's edit()
#If validation function exists, and the terminating key of CLineEdit's edit() is a navigation key(see below)
#:It will call the validation function on the Field's _data, if the data is valid, it goes to next step, otherwise it will repeat calling CLineEdit's edit().
#After validation is done, if _help function exists, it will recall the help function using MessageStatus::ClearMessage and contianer()'s reference as arguments.
#It will return the terminating key
''Navigation keys are Up key, Down key, Tab key or Enter key.''<br />
''MessageStatus is enumerated in '''cuigh.h'''''
===CValedit Student Resources===
====CValEdit Help/Questions Blogs====
{| class="wikitable" border="1"
| [http://divya522.blogspot.ca/2013/03/errors-in-cvaledit.html Cdirection Error]||[mailto:dsharma37@myseneca.ca?subject=oop344 Divya Sharma]||
|}
====CValedit Blog Posts====
==CCheckMark==
Creates a single CheckMark on the screen and allows the user to:<br />
# Toggle it, if it is set to be a CheckMark for a Check List.
# Only check it when its unchecked, if it is set to be a CheckMark for a Radio Button List.
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
#include "clabel.h"
namespace cio{
class CCheckMark : public CField{
bool _flag;
bool _radio;
char _format[4];
CLabel _Label;
public:
CCheckMark(bool Checked,const char* Format, const char* Text,
int Row, int Col, int Width, bool IsRadio = false);
CCheckMark(const CCheckMark& C);
void draw(int fn = C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* flag);
bool checked()const;
void checked(bool val);
bool radio();
void radio(bool isRadio);
operator bool();
operator char*();
bool operator=(bool flag);
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
int _flag;
bool _radio;
char _format[4];
CLabel _Label;
</syntaxhighlight></big>
*'''_flag''' holds the status of the Checkbox (0: unchecked or 1: checked ) and is pointed by _data pointer .
*'''_radio''' dictates the behavior of the Checkbox as a radio-button, or a check-mark.
*'''_format''' holds the characters, the Checkbox is drawn with (i.e. "[X]", "(O)", "<*>", etc...).
*'''_Label''' holds the Label attached to the this Checkbox
===Constructor / Destructor===
<big><syntaxhighlight lang="cpp">
CCheckMark(bool Checked,const char* Format, const char* Text, int Row, int Col, int Width, bool IsRadio = false);
</syntaxhighlight></big>
*Passes the ''Row, Col, Width and "1"'' to ''row, col, width and height'' arguments of CField and directly initializes _Label with ''Text, 0, 4, and (Width-4)'' for ''Str, Row, Col and Len'', arguments of CLabel's Constructor.<br />
*Sets the frame of _Label to its owner (Checkmark i.e. 'this');
*Sets _flag to Checked
*Sets _radio to IsRadio
*Copies Format to _format
*Sets _data to the address of _flag
<big><syntaxhighlight lang="cpp">
CCheckMark(const CCheckMark& C);
</syntaxhighlight></big>
*Passes incoming CCheckMark reference ("C") to CField's copy constructor, and directly initializes the _Label with the _Label of C
*Sets all the attributes of this object to the attributes of incoming CCheckMark reference ("C")
*Sets _data to the address of _flag
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_NO_FRAME) ;
</syntaxhighlight></big>
Using Console methods:<br />
#displays the _format string at absRow() and absCol()
#if _flag is false, it will overwrite the second character printed above, with a space (removes the check mark on console)
#draw()s the _Label
#sets the position of the cursor at the checkmark (second character of printed _format)
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
#draw()s the checkmark
#gets a key
#: the key must be either SPACE or any non-printable character (all printable character are ignored)
#if the entered key is space
##if _radio is true, it will set the _flag to true
##if _radio is false, it will flip the value of _flag.
##draw()s the checkmark again
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
*Always return true;
<big><syntaxhighlight lang="cpp">
void set(const void* flag);
</syntaxhighlight></big>
*Casts the incoming flag pointer to an (bool*) and sets the content of '''_flag''' to where '''flag''' is pointing to.
<big><syntaxhighlight lang="cpp">
bool checked()const;
void checked(bool val);
</syntaxhighlight></big>
*These methods set and get _flag.
<big><syntaxhighlight lang="cpp">
bool radio(); // addition for R0.6
void radio(bool isRadio); // addition for R0.6
</syntaxhighlight></big>
* These to methods, get and set the '''_radio''' attribute.
<big><syntaxhighlight lang="cpp">
operator bool(); // addtion for R0.6
</syntaxhighlight></big>
* Overload the '''bool''' cast to return the value of '''_flag'''
<big><syntaxhighlight lang="cpp">
operator char*(); // addtion for R0.6
</syntaxhighlight></big>
* Overload the '''char*''' cast to return the value of '''_Label.data()'''
<big><syntaxhighlight lang="cpp">
bool operator=(bool flag);; // addtion for R0.6
</syntaxhighlight></big>
* Overload the operator= and set the _flag to flag
===CCheckMark Student Resources===
====CCheckMark Help/Questions Blogs====
Hey Guys, In the constructor for CCheckmark it says : set the frame of _Label to its owner
(checkmark i.e, "this")
Can anyone tell me what this means or what the purpose of this is. Thanks in advance.
Use this with caution since I don't really know if it is correct, but I did
'''Label.container(this->container());'''
-Bo Li
http://lhmcintosh.blogspot.ca/2013/03/this.html Hope this helps! - LMC
Please help - http://oop344class.wordpress.com/2013/03/29/setting-cursor-position-in-ccheckmark-draw-function/
-S.E.
====CCheckMark Blog Posts====
==CMenuItem==
CMenuItem provides a Label that can be marked as selected by pressing the space bar.
<big><syntaxhighlight lang="cpp">
#include "clabel.h"
#include "cfield.h"
namespace cio{
class CMenuItem:public CField{
bool _selected;
char _format[3];
CLabel Label;
public:
CMenuItem(bool Selected,const char* Format, const char* Text,
int Row, int Col, int Width);
CMenuItem(const CMenuItem &CM);
void draw(int fn = C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* Selected);
bool selected()const;
void selected(bool val);
const char* Text();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
bool _selected;
</syntaxhighlight></big>
Holds the status of the MenuItem, being selected or not;
<big><syntaxhighlight lang="cpp">
char _format[3];
</syntaxhighlight></big>
Holds the surrounding characters with which a selected MenuItem is shown:<br />
If _format holds "[]", then a selected MenuItem will be like [MenuText]
<big><syntaxhighlight lang="cpp">
CLabel Label;
</syntaxhighlight></big>
Hold the Text of the MenuItem.
===Constructors / Destructor===
<big><syntaxhighlight lang="cpp">
CMenuItem(bool Selected,const char* Format, const char* Text, int Row, int Col, int Width);
</syntaxhighlight></big>
#Initializes the CField with Row, Col, Width and 1 for Height
#Initializes the Label with (Text, 0, 1 and Width-2) for (Str, Row, Col, and Len)
#Sets the attributes to corresponding arguments
#Sets CFields::_data to the address of _format
#Sets the Label's frame to this object.
<big><syntaxhighlight lang="cpp">
CMenuItem(const CMenuItem &CM);
</syntaxhighlight></big>
#Passes CM to CField and Initializes the Label with CM
#Sets the _selected to _selected of CM
#Sets CFields::_data to the address of _format
#Sets the Label's frame to this object.
===Methods===
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_NO_FRAME) ;
</syntaxhighlight></big>
#Draws the Label with fn
#If _selected is true, it surrounds the Label Text the _format[0] and _format[1]
#If _selected if false, it surrounds the Label with SPACEs (overwrites _format[0] and _format[1])
#Positions the cursor at the first character of the Label
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
#draw()s the MenuItem
#gets a key
#: the key must be either SPACE or any non-printable character (all printable character are ignored)
#if the entered key is space
##it will set the _selected to true
##draw()s the MenuItem again
#returns the key
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Returns true.
<big><syntaxhighlight lang="cpp">
void set(const void* Selected);
</syntaxhighlight></big>
Sets _selected to where Selected is pointing to
<big><syntaxhighlight lang="cpp">
bool selected()const;
</syntaxhighlight></big>
Returns Selected
<big><syntaxhighlight lang="cpp">
void selected(bool val);
</syntaxhighlight></big>
Sets _selected to val
<big><syntaxhighlight lang="cpp">
const char* Text();
</syntaxhighlight></big>
Returns the text of Label
===CMenuItem Student Resources===
====CMenuItem Help/Questions Blogs====
{| class="wikitable" border="1"
|-
| Question || Comment
|-
| [http://pankajsama01.blogspot.ca/2013/03/getting-cdirection-error.html Getting Cdirection Error](Pankaj Sama)||
|-
|[http://lhmcintosh.blogspot.ca/2013/03/05-cdialog-issue.html 0.5 CDialog Error] (Lucas McIntosh)|| just put return *_fld[_curidx]; - Glaser
|}
====CMenuItem Blog Posts====
==CText==
CText is a CField to edit a multiline text.<br />
To do this, it will use the [[#The_Text_Helper_Class|Text class]] to convert a character string containing a text into a (simulated) two dimensional array.
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
#include "text.h"
using namespace cio;
class CText:public CField{
Text _T;
bool _displayOnly;
int _curpos;
bool* _insertmode;
int _offset;
int _lcurpos;
int _loffset;
public:
CText(int Row, int Col, int Width, int Height, bool* Insertmode,
bool displayOnly = false, const char* Border=C_BORDER_CHARS);
CText(const char* Str, int Row, int Col, int Width, int Height,
bool* Insertmode, bool displayOnly = false,
const char* Border=C_BORDER_CHARS);
void draw(int fn = C_FULL_FRAME);
void set(const void *Str);
void *data()const;
int edit();
bool editable()const;
bool displayOnly();
void displayOnly(bool val);
};
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
Text _T;
</syntaxhighlight></big>
An instance of the [[#The_Text_Helper_Class|Text class]]
<big><syntaxhighlight lang="cpp">
bool _displayOnly;
</syntaxhighlight></big>
If it is set to true, then the Text can only be viewed but not edited; All scrolling, page UP, DOWN, etc... is enabled but any attempt to change the text, is ignored quietly. This attribute is passed to ReadOnly argument of Console::edit(......).
<big><syntaxhighlight lang="cpp">
int _curpos;
bool* _insertmode;
int _offset;
</syntaxhighlight></big>
Values used by Console::edit(......)
<big><syntaxhighlight lang="cpp">
int _lcurpos;
int _loffset;
</syntaxhighlight></big>
Vertical cursor position in text.
Vertical offset of the text relative to the frame of CText. This value indicates, how many line are hidden above the frame when text is scrolled down.
===Constructors/Destructor===
<big><syntaxhighlight lang="cpp">
CText(int Row, int Col, int Width, int Height, bool* Insertmode,
bool displayOnly = false, const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Initialized the CField with the corresponding incoming arguments and then sets all the attributes to their corresponding arguments.
<big><syntaxhighlight lang="cpp">
CText(const char* Str, int Row, int Col, int Width, int Height,
bool* Insertmode, bool displayOnly = false,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Works exactly like the previous constructor but it also '''set()'''s the class to '''Str'''.
===Methods===
'''Under Construction'''
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
First it will draw the CField using the fn arguement.<br />
Then it will use console.display to display all the Lines of _T that are positioned inside the frame of the CText. (i.e. from _loffset to _loffset + Height() - 2).<br />
Two Important things to note:
# you should note that '''Lines''' are '''console.display()'''ed from _offset character. (i.e. &_T[theLineNumber][_offset]).
# Also you should '''console.display()''' the Lines only if the length of the line is more than the _offset(i.e. _T[theLineNumver].strlen() > _offset)
<big><syntaxhighlight lang="cpp">
void set(const void *Str);
</syntaxhighlight></big>
Sets the '''_T''' attribute to the incoming string.
<big><syntaxhighlight lang="cpp">
void *data()const;
</syntaxhighlight></big>
Exports the string out of _T and returns its address after casting it to '''void*'''.
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
# Create local variables to hold the following attributes in case ESCAPE is hit to undo:
## _T
## _curpos
## _offset
## _lcurpos
## _loffset
# Create the usual '''while(!done)''' structure for interfacing with user
# '''draw()''' the text
# '''console.edit()''' the Line at where vertical cursor is after _loffset.
## use absRow() and _lcurpos to calculate the row on which the editing should happen
## use absCol() to calculate the column on which editing to happen.
## use width() to calculate the fieldLen for '''console.edit()'''
## use the '''size()''' of the current '''Line''' in '''_T''' to determine the maximum data length of the string to '''console.edit()'''
## the isTextEditor is always true
## the ReadOnly depends on the value of '''_displayOnly'''
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always return true;
<big><syntaxhighlight lang="cpp">
bool displayOnly();
void displayOnly(bool val);
</syntaxhighlight></big>
These methods Get and Set the '''_displayOnly''' attribute.
===The Text Helper Class===
[https://github.com/Seneca-OOP344/20131-notes/tree/master/TextClass Text class]
===CText Student Resources===
====CText Help/Questions Blogs====
====CText Blog Posts====
{| class="wikitable" border="1"
|-
| Question || Comment
|-
|[http://bleulynn.wordpress.com/2013/04/15/ctext/] curpos (Ran)||
|}
==CCheckList==
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
#include "ccheckmark.h"
namespace cio{
class CCheckList : public CField{
CCheckMark* _checkmarks[32];
bool _radio;
char _format[4];
unsigned int _cnt;
unsigned int _flags;
unsigned int _cur;
public:
CCheckList(const char* Format, int Row, int Col, int Width,bool radio, bool Bordered = true,const char* Border=C_BORDER_CHARS);
~CCheckList(void);
CCheckList& add(const char* Text, bool selected = false);
CCheckList& operator<<(const char* Text);
void draw(int fn = C_FULL_FRAME);
int edit();
void* data();
void set(const void* data);
CCheckMark& operator[](unsigned int index);
bool editable()const;
bool radio()const;
void radio(bool val);
unsigned int flags()const;
void flags(unsigned int theFlags);
int selectedIndex()const;
void selectedIndex(int index);
unsigned int length();
};
}
</syntaxhighlight></big>
===Attributes===
<big><syntaxhighlight lang="cpp">
CCheckMark* _checkmarks[32];
</syntaxhighlight></big>
An array of 32 CCheckmark pointers that will point to _cnt dynamically allocated CCheckMarks.
<big><syntaxhighlight lang="cpp">
bool _radio;
</syntaxhighlight></big>
Holds the behaviour of the CCheckList to be like a Radio Button List or Check Mark List
<big><syntaxhighlight lang="cpp">
char _format[4];
</syntaxhighlight></big>
Holds the format with which a check mark is displayed (i.e. "[X]" or "(o)" etc...)
<big><syntaxhighlight lang="cpp">
unsigned int _cnt;
</syntaxhighlight></big>
Holds the number of CCheckMarks currently in CCheckList
<big><syntaxhighlight lang="cpp">
unsigned int _flags;
</syntaxhighlight></big>
Always holds the bit pattern corresponding to the status of the CCheckMarks in the List. Note that bit 0 (right most) will correspond to the first CCheckMark.
<big><syntaxhighlight lang="cpp">
unsigned int _cur;
</syntaxhighlight></big>
Holds the index of the CCheckMark in the "_checkmarks" array which is currently being edited. (focused)
===Constructors/Destructor===
<big><syntaxhighlight lang="cpp">
CCheckList(const char* Format, int Row, int Col, int Width,bool radio, bool Bordered = true,const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
Passes corresponding values to the Base class (CField) then
#sets the _data attribute to the address of _flags
#copies '''Format''' and '''radio''' into '''_format''' and '''_radio''' respectively
#sets '''_cnt, _cur''' and '''_flags''' to zero
<big><syntaxhighlight lang="cpp">
~CCheckList(void);
</syntaxhighlight></big>
Goes through '''_checkmarks''' up to '''_cnt''' and if deletes them one by one.
===Methods===
<big><syntaxhighlight lang="cpp">
CCheckList& add(const char* Text, bool selected = false);
</syntaxhighlight></big>
* Only adds a new CCheckMark if '''_cnt''' does not exceed the maximum amount of '''_checkmarks''' (32)
* Creates a new CCheckMark with the row being '''_cnt'''+1, the height being 1 and the length being the length of '''Text'''+4
* Sets the newly created CCheckMarks' frame to '''this'''
* Automatically expands the width of the CCheckList if the width of the newly created CCheckMark is bigger than the current width of the CCheckList
* Sets the height of the CCheckList to '''_cnt'''+3
* Updates the bit pattern of '''_flags'''
* Increments '''_cnt'''
<big><syntaxhighlight lang="cpp">
CCheckList& operator<<(const char* Text);
</syntaxhighlight></big>
returns add(Text).
<big><syntaxhighlight lang="cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
Draws the frame and then draws all the '''_checkmarks''', making sure the cursor is standing under the first checked checkmark.
<big><syntaxhighlight lang="cpp">
int edit();
</syntaxhighlight></big>
*Draws the '''CCheckList''' then starts editing the '''_checkmarks''' form '''_cur''' and according to the return key of CCheckMark::edit():
**If Down or Right key is hit it goes to the next '''_checkmark''', if '''_cur''' is the last one, then it exits the edit, returning the last key entered.
**UP and Left key works in opposite direction of Down and Right, if '''_cur''' is already zero, then it exits the edit, returning the last key entered.
**If Space is hit, then if '''_radio''' is true, it will uncheck all the '''_checkmarks''' other than the '''_cur'''rent one.
<big><syntaxhighlight lang="cpp">
void* data();
</syntaxhighlight></big>
returns the bit pattern held in _flags. <br />
''make sure _flags are updated to the status of the '''_checkmarks'''''
<big><syntaxhighlight lang="cpp">
void set(const void* data);
</syntaxhighlight></big>
sets the '''_flags''' and updates the '''_checkmarks''' to the bitpattern of '''_flags'''
<big><syntaxhighlight lang="cpp">
CCheckMark& operator[](unsigned int index);
</syntaxhighlight></big>
returns the CCheckMark corresponding the '''index''' value.
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
always returns true;
<big><syntaxhighlight lang="cpp">
bool radio()const;
</syntaxhighlight></big>
returns '''_radio'''
<big><syntaxhighlight lang="cpp">
void radio(bool val);
</syntaxhighlight></big>
sets the _radio and updates all _checkMarks radio value.
<big><syntaxhighlight lang="cpp">
unsigned int flags()const;
</syntaxhighlight></big>
returns the '''_flags''' attribute
<big><syntaxhighlight lang="cpp">
void flags(unsigned int theFlags);
</syntaxhighlight></big>
sets the '''_flags''' attribute
<big><syntaxhighlight lang="cpp">
int selectedIndex()const;
</syntaxhighlight></big>
returns the index of the first CCheckMark that is selected, and -1 if nothing is selected.
<big><syntaxhighlight lang="cpp">
void selectedIndex(int index);
</syntaxhighlight></big>
sets the selectedindex. (only un-selects the rest if object is in radio mode)<br />
if index is less than zero, then it will un-selects all
<big><syntaxhighlight lang="cpp">
unsigned int length();
</syntaxhighlight></big>
returns '''_cnt'''
===CCheckList Student Resources===
====CCheckList Help/Questions Blogs====
====CCheckList Blog Posts====
{| class="wikitable" border="1"
|-
| Question || Comment
|-
|Anybody knows how to update the bit pattern of _flags in CCheckList add() method? (Xinggui Deng)||
|-
|You can do: _flags = _flags (bit operator or) (1 << _cnt) ---Gary Chen ||
|-
|[http://kelan-meta.blogspot.ca/2013/04/cchecklist-constructors.html CCheckList constructor question]||
|-
|Also, Brian found out we should use the console.getkey() instead of CCheckMarks::edit() to get the key in edit() function--Gary Chen ||
|-
|[http://kelan-meta.blogspot.ca/2013/04/checked.html Can anyone give me a hint as to why there are garbage symbols after checked option?]|| Thank you for pointing out in your blog that bio::strncpy() does not copy the null byte! I was able to fix my group's clabel.cpp with your help -- Brian Wong (yhwong)
|}
==CMenu and MNode (optional)==
CMenu is a linked list of MNodes. Providing menu selection for the user in two formats; Drop Down List, or a simple menu.
<big><syntaxhighlight lang="cpp">
#ifndef __CIO__CMENU_H__
#define __CIO__CMENU_H__
#include "cuigh.h"
#include "cfield.h"
#include "cmenuitem.h"
#include "cbutton.h"
namespace cio{
class Cmenu;
class MNode{
CMenuItem* _item;
MNode* _next;
MNode* _prev;
unsigned int _index;
MNode(CMenuItem* item,unsigned int index, MNode* prev, MNode* next = ((MNode*)0));
~MNode(void);
friend class CMenu;
};
class CMenu : public CField{
MNode* _first;
MNode* _head;
MNode* _tail;
MNode* _cur;
char _format[3];
unsigned int _cnt;
int _selectedIndex;
bool _dropdown;
bool _dropped;
bool goNext();
bool goPrev();
CButton _Title;
public:
static const bool Select;
CMenu(const char* Title, const char* Format, int Row, int Col,
int Width, int Height,bool dropdown,
const char* Border=C_BORDER_CHARS);
CMenu& add(const char* Text, bool selected = false);
CMenu& operator<<(const char* Text);
CMenu& operator<<(bool select);
void draw(int fn = C_FULL_FRAME);
int edit();
void set(const void* data);
int selectedIndex() const;
int selectedIndex(int index);
const char* selectedText();
bool editable()const;
~CMenu(void);
};
extern const bool Select;
}
#endif
</syntaxhighlight></big>
===MNode===
MNode holds to main about an Item in the menut:
# The CMenuItem object
# The index of this Item
MNode is a fully private class and is only accessible by CMenu.
====Attributes====
<big><syntaxhighlight lang="cpp">
CMenuItem* _item;
</syntaxhighlight></big>
Holds the address of a dynamically allocated CMenuItem
<big><syntaxhighlight lang="cpp">
unsigned int _index;
</syntaxhighlight></big>
Holds the index (sequence -1) number of the '''CMenuItem''' in the '''CMenu'''.
<big><syntaxhighlight lang="cpp">
MNode* _next;
MNode* _prev;
</syntaxhighlight></big>
Standard next and previous pointer for a linked list node.
====Constructor/Destructor====
<big><syntaxhighlight lang="cpp">
MNode(CMenuItem* item,unsigned int index, MNode* prev, MNode* next = ((MNode*)0));
</syntaxhighlight></big>
Sets the corresponding attributes to the values of the arguments.
<big><syntaxhighlight lang="cpp">
~MNode(void);
</syntaxhighlight></big>
deletes the '''_item'''
===CMenu===
CMenu is a linked list of MNodes and also contains a CButton for a Title (only used on if in '''_dropdown''' mode). <br />
Assuming that a CMenu is created with a title as "FILE" and menu-items as "Save, Load, Print, Quit":
*When in '''_dropdown''' mode:
When drawing, Only the _Title(CButton) is drawn (and not the menu itself)
<big><pre>
FILE
</pre></big>
When edited (in '''_dropdown''' mode) the CButton gets activated and if it is hit, then the Menu will be dropped down (drawn) under the CButton and user can browse through the options and select one of them. selecting the option in this case will close the menu and CButton gets activated again:<br />
when active, CMenu looks like this:
<big><pre>
[FILE]
</pre></big>
User hits enter: (since nothing is selected all menu items are unselected)
<big><pre>
FILE
/-------\
| Save |
| Load |
| Print |
| Quit |
\-------/
</pre></big>
Now the cursor is standing under '''S'''ave.
User hits down arrow twice to select '''P'''rint and then hits Space:
<big><pre>
[FILE]
</pre></big>
The Print is selected and The menu is closed and FILE is active again.
If the user hits Enter again:
<big><pre>
FILE
/-------\
| Save |
| Load |
|[Print]|
| Quit |
\-------/
</pre></big>
We will see the Print is selected and the cursor in under P.
If user hits Enter instead of space, the selection wont change and whatever was selected before will remain the same:
<big><pre>
[FILE]
</pre></big>
User hits navigation keys and moves out of the CMenu Field.
''Note that if '''left''' or '''right''' navigation keys are hit when the title is active, then they are translated to '''up''' or '''down''' respectively.
*When NOT in '''_dropdown''' mode:
*:The CButton will not be displayed at all, and when user starts to edit, he enters the menu browsing the items and if he gets to the end of the menu, the control goes to the next field in the dialog. If user goes up and passes the first them, then the control will go to the previous field in the dalog.
<big><pre>
/-------\
| Save |
| Load |
|[Print]|
| Quit |
\-------/
</pre></big>
''Note that if the number of menu items are more than the space provided by the CField's frame, then the menu items should scroll up and down to accommodate the selection''
====Attributes====
<big><syntaxhighlight lang = "cpp">
MNode* _first;
</syntaxhighlight></big>
points to the first CMenuItem visible on the menu.
<big><syntaxhighlight lang = "cpp">
MNode* _head;
MNode* _tail;
MNode* _cur;
</syntaxhighlight></big>
standard Link list pointers
<big><syntaxhighlight lang = "cpp">
char _format[3];
</syntaxhighlight></big>
The two characters used to surround the selected menu item
<big><syntaxhighlight lang = "cpp">
unsigned int _cnt;
</syntaxhighlight></big>
The number of CMenuItems in CMenu
<big><syntaxhighlight lang = "cpp">
int _selectedIndex;
</syntaxhighlight></big>
The index of the selected CMenuItem (saved in MNode::index), if there is no selected menu, then this value is -1.
<big><syntaxhighlight lang = "cpp">
bool _dropdown;
</syntaxhighlight></big>
True if the Menu is a Drop Down Menu.
<big><syntaxhighlight lang = "cpp">
bool _dropped;
</syntaxhighlight></big>
Flag used to hold the status of a Drop Down Menu, (_dropped or not)
<big><syntaxhighlight lang = "cpp">
bool goNext();
bool goPrev();
</syntaxhighlight></big>
standard gonext() and goprev() in linked lists
<big><syntaxhighlight lang = "cpp">
CButton _Title;
</syntaxhighlight></big>
CButton holding the Title of this menu
====Constructor/Destructor====
<big><syntaxhighlight lang = "cpp">
CMenu(const char* Title, const char* Format, int Row, int Col,
int Width, int Height,bool dropdown,
const char* Border=C_BORDER_CHARS);
</syntaxhighlight></big>
#Initializes CField as follows:
#* Row: Passes Row, if this menu is not a dropdown, otherwise it will pass Row+1.
#* Col, Width, Height are passed directly
#* Data: a void null pointer is passed for data
#* Bordered: since CMenu is always bordered, true is passed here
#* Border is directly passed.
#Initializes _Title (the CButton) as follows:
#* Str, Title is passed here
#* Row, -1
#* Col, 1
#* Bordered, since the title of the dorpdown is alway NOT bordered, then false is passed here.
#Constructor Settings:
#* Link list attributes are set as standard linked list contructor
#* Format is copied into _format
#* _cnt is set to zero
#* _selectedIndex is set to -1
#* _data is set to address of _selectedIndex
#* _dropdown is set to dropdown
#* _dropped is set to false
#* _Title's frame is set to the CMenu object (this)
<big><syntaxhighlight lang = "cpp">
~CMenu();
</syntaxhighlight></big>
Standard Linked list destructor
====Methods====
<big><syntaxhighlight lang = "cpp">
CMenu& add(const char* Text, bool selected = false);
</syntaxhighlight></big>
Standard append for a linked list:
#creates an MNode with
#* a new CMenutItem with
#*:selected, _format, Text for first three arguments
#*:1, 1, and (width of the menu) -2, for Row col and width
#* the rest are what is needed for a standard append procedure for a linked list
#appends the new MNode to the end of the list
#if the new added CMenuItem is selected, it will update the selected index
'''''Note that if the added CMenuItem is the first CMenuItem in the list, then the _first pointer should be pointing to it'''''
<big><syntaxhighlight lang = "cpp">
CMenu& operator<<(const char* Text);
</syntaxhighlight></big>
returns add(Text)
<big><syntaxhighlight lang = "cpp">
CMenu& operator<<(bool select);
</syntaxhighlight></big>
if select is true, it will select the last CMenuItem added to the CMenu
<big><syntaxhighlight lang = "cpp">
void draw(int fn = C_FULL_FRAME);
</syntaxhighlight></big>
#if this is a '''_dropdown''', then it will draw the _Title
#: and then if '''_dropped''' is true, it will draw the CField and then draw the CMenuItems starting form what _first is pointing to, up to (CField's hieght -2) times.
#if this not a '''_dropdown''' then the _Title will never be drawn and the CMenuItems should be drawn as above.
<big><syntaxhighlight lang = "cpp">
int edit();
</syntaxhighlight></big>
Edits the menu the way it is explains in [[#CMenu|CMenu]] description.<br />
If it is too confusing, this [[CMenu pseudo code - OOP344 20113|pseudo code]] may help.
<big><syntaxhighlight lang = "cpp">
void set(const void* data);
</syntaxhighlight></big>
Sets the selected index to the integer pointed by data;
<big><syntaxhighlight lang = "cpp">
int selectedIndex() const;
</syntaxhighlight></big>
returns the selected index or -1 if nothing is selected
<big><syntaxhighlight lang = "cpp">
int selectedIndex(int index);
</syntaxhighlight></big>
sets the selected index.
<big><syntaxhighlight lang = "cpp">
const char* selectedText();
</syntaxhighlight></big>
returns the text of the selected menu, if nothing is selected, and empty string is returned.
<big><syntaxhighlight lang = "cpp">
bool editable()const;
</syntaxhighlight></big>
returns true if '''_cnt''' is greater than zero
===CMenu Student Resources===
====CMenu Help/Questions Blogs====
====CMenu Blog Posts====
