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Returns the reference of the Field that was just being edited.
==CLineEdit==
'''ClineEdit''' encapsulates the bio_edit function of bio library.
<big><syntaxhighlight lang="cpp">
#pragma once
#include "cfield.h"
class CLineEdit: public CField{
bool _dyn;
int _maxdatalen;
int* _insertmode;
int _curpos;
int _offset;
public:
CLineEdit(char* Str, int Row, int Col, int Width,
int Maxdatalen, int* Insertmode,
bool Bordered = false,
const char* Border=C_BORDER_CHARS);
CLineEdit(int Row, int Col, int Width,
int Maxdatalen, int* 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);
};
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<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);
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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 (FWField) 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 FWField'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);
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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();
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If '''_dyn''' is true, it will deallocate the character array pointed by Fields's '''_data'''
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void draw(int Refresh = C_FULL_FRAME);
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It will first call Frame's draw passing '''Refresh'''as an argument to it.<br />
Then it will make a direct call to bio_display to show the data kept in Field's '''_data'''.<br />
The values used for the arguments of bio_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 is border is visible''')
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int edit();
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Makes a direct call to, and returns '''bio_edit()'''.
For the coordinates and width arguments follow the same rules as the draw function.
For the rest of the arguments of bio_edit, use the attributes of '''CLineEdit'''.
<big><syntaxhighlight lang="cpp">
bool editable()const;
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Always return true;
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void set(const void* Str);
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Copies the characters pointed by '''Str''' into the memory pointed by Field's '''_data''' up to '''_maxdatalen''' characters.
==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"
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 fn=C_FULL_FRAME);
int edit();
bool editable()const;
void set(const void* str);
};
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===Attributes===
This class does not have any attributes of its own!
===Constructor / Destructor===
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CButton(const char *Str, int Row, int Col,
bool Bordered = true,
const char* Border=C_BORDER_CHARS);
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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.
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virtual ~CButton();
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Deallocates the allocated memory pointed by Field's '''_data'''.
===Methods===
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void draw(int fn=C_FULL_FRAME);
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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 bio_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 cgh.h) otherwise return the entered key.<br />
<big><syntaxhighlight lang="cpp">
bool editable()const;
</syntaxhighlight></big>
Always returns true;
<big><syntaxhighlight lang="cpp">
void set(const void* str);
</syntaxhighlight></big>
Reallocate memory for new text and then set it to content of '''str'''<br />
hint:<br />
:''First deallocated what is pointed by Field's '''_data'''.''<br />
:''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.''
==CCheck==
<big><syntaxhighlight lang="cpp">
#include "cfield.h"
#include "clabel.h"
class CCheck : public CField{
int _flag;
int _radio;
char _format[4];
CLabel _Label;
public:
CCheck(bool Checked,const char* Format, const char* Text, int Row, int Col, int Width, bool IsRadio = false);
CCheck(const CCheck& C);
void draw(int fn = C_NO_FRAME) ;
int edit();
bool editable()const;
void set(const void* flag);
// note that void *data() is removed!!!
bool checked()const;
void checked(bool val);
};
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===Attributes===
<big><syntaxhighlight lang="cpp">
int _flag;
int _radio;
char _format[4];
CLabel _Label;
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*'''_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">
CCheck(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 />
*: *see page 64 of Practical Programming Techniques Using C++
*Sets the frame of _Label to itself
*Sets _flag to Checked
*Sets _radio to IsRadio
*Copies Format to _format
*Sets _data to the address of _flag
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CCheck(const CCheck& C);
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*Passes incoming CCheck 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 CCheck reference ("C")
*Sets _data to the address of _flag
===Methods===
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void draw(int fn = C_NO_FRAME) ;
</syntaxhighlight></big>
*Uses bio_displayflag() to display _flag using _format at absRow() and absCol()
*Then draw()s the _Label
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int edit();
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*returns bio_flag()'s returned value.
*:bio_flag is to edit the value of _flag using the same arguments used in draw() as radiobutton or checkbox depending to the value of _radio
<big><syntaxhighlight lang="cpp">
bool editable()const;
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*Always return true;
<big><syntaxhighlight lang="cpp">
void set(const void* flag);
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*Casts the incoming flag pointer to an (int*) 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.
