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Prototype

13,522 bytes removed, 22:21, 29 March 2007
→‎Sample code
== Advantages ==
<ul>
<li>Enables definition of new objects with various structure</li>
<li>Facilitates Adding and removing new types of objects at run time</li>
<li>Hides the Concrete class structure from clients</li>
<li>Reduces the amount of subclasses</li>
</ul>
 
 
 
== Side Effects ==
== Pattern diagram ==
Subclasses must implement the Clonable interface and then override the clone() method and call the super classes clone method in the implementation of overridden clone method using super.clone() statement.If you don't implement Cloneable, the super.clone() implementation will throw a CloneNotSupportedException.
The following is the implementation of Cookie class in apache tomcat server. This class makes use of prototype pattern and Clonable interface to create clones of cookie object.[http://en.wikipedia.org/wiki/Apache_HTTP_Server Apache]
// so long as sun.servlet.* must run on older JDK 1.02 JVMs which
// don't include that support.
 
*****************************************************************************************************************************
*****************************************************************************************************************************
** Implementing the Clonable Interface **
*****************************************************************************************************************************
*****************************************************************************************************************************
public class Cookie implements Cloneable {
*
*/
************************************************************************************************************************************************************************************************************************************************************ Overriding the Clone Method and calling the super class Clone method ************************************************************************************************************************************************************************************************************************************************************
public Object clone() {
try {
'''C++ Sample:'''
The following classe is a sample of prototype pattern implementation used in GNU Image Manipulation Program(gimp-2.3.15 open source graphice application). the The prototypical class is ''imap_object.c'' that defines the ''object_clone'' method.[http://en.wikipedia.org/wiki/GIMP GIMP]
#include "imap_menu_funcs.h"
*****************************************************************************************************************************
*****************************************************************************************************************************
** Object_t Sturcture Definition on the header file **
*****************************************************************************************************************************
*****************************************************************************************************************************
struct Object_t {
ObjectClass_t *class;
gchar *blur;
};
 
typedef void (*MoveSashFunc_t)(Object_t*, gint, gint);
typedef void (*OutputFunc_t)(gpointer, const char*, ...);
 
struct AreaInfoDialog_t;
 
struct ObjectClass_t {
gchar *name; AreaInfoDialog_t *info_dialog; GdkPixmap *icon; GdkBitmap *mask;  gboolean (*is_valid)(Object_t *obj); void (*destruct)(Object_t *obj); Object_t* (*clone)(Object_t *obj); void (*assign)(Object_t *obj, Object_t *des); void (*normalize)(Object_t *obj); void (*draw)(Object_t *obj, GdkWindow *window, GdkGC* gc); void (*draw_sashes)(Object_t *obj, GdkWindow *window, GdkGC* gc); MoveSashFunc_t (*near_sash)(Object_t *obj, gint x, gint y); gboolean (*point_is_on)(Object_t *obj, gint x, gint y); void (*get_dimensions)(Object_t *obj, gint *x, gint *y, gint *width, gint *height); void (*resize)(Object_t *obj, gint percentage_x, gint percentage_y); void (*move)(Object_t *obj, gint dx, gint dy); gpointer (*create_info_widget)(GtkWidget *frame); void (*update_info_widget)(Object_t *obj, gpointer data); void (*fill_info_tab)(Object_t *obj, gpointer data); void (*set_initial_focus)(Object_t *obj, gpointer data); void (*update)(Object_t *obj, gpointer data); void (*write_csim)(Object_t *obj, gpointer param, OutputFunc_t output); void (*write_cern)(Object_t *obj, gpointer param, OutputFunc_t output); void (*write_ncsa)(Object_t *obj, gpointer param, OutputFunc_t output); void (*do_popup)(Object_t *obj, GdkEventButton *event);  const gchar* (*get_stock_icon_name)(void);...
};
 
Object_t *object_ref(Object_t *obj);
void object_unref(Object_t *obj);
#define object_get_dimensions(obj, x, y, width, height) \
((obj)->class->get_dimensions((obj), (x), (y), (width), (height)))
 
#define object_normalize(obj) \
((obj)->class->normalize(obj))
 
#define object_resize(obj, per_x, per_y) \
((obj)->class->resize((obj), (per_x), (per_y)))
 
#define object_update(obj, data) \
((obj)->class->update((obj), (data)))
 
#define object_update_info_widget(obj, data) \
((obj)->class->update_info_widget((obj), (data)))
 
#define object_fill_info_tab(obj, data) \
((obj)->class->fill_info_tab((obj), (data)))
 
#define object_get_stock_icon_name(obj) \
((obj)->class->get_stock_icon_name())
 
typedef struct {
Object_t *obj;
void (*set_xy)(Object_t *obj, guint state, gint x, gint y);
} ObjectFactory_t;
 
gboolean object_on_button_press(GtkWidget *widget, GdkEventButton *event,
gpointer data);
 
typedef struct {
GList *list;
} ObjectListCallback_t;
 
struct ObjectList_t {
GList *list; gboolean changed; ObjectListCallback_t changed_cb; ObjectListCallback_t update_cb; ObjectListCallback_t add_cb; ObjectListCallback_t remove_cb; ObjectListCallback_t select_cb; ObjectListCallback_t move_cb; ObjectListCallback_t geometry_cb;...
};
 
ObjectList_t *make_object_list (void);
void object_list_destruct(ObjectList_t *list);
ObjectList_t *object_list_copy(ObjectList_t *des, ObjectList_t *src);
ObjectList_t *object_list_append_list(ObjectList_t *des, ObjectList_t *src);
 
void object_list_append(ObjectList_t *list, Object_t *object);
void object_list_prepend(ObjectList_t *list, Object_t *object);
Object_t *object_list_near_sash(ObjectList_t *list, gint x, gint y,
MoveSashFunc_t *sash_func);
 
gint object_list_cut(ObjectList_t *list);
void object_list_copy_to_paste_buffer(ObjectList_t *list);
void object_list_paste(ObjectList_t *list);
 
void object_list_remove_all(ObjectList_t *list);
void object_list_delete_selected(ObjectList_t *list);
void object_list_move_to_front(ObjectList_t *list);
void object_list_send_to_back(ObjectList_t *list);
 
void object_list_write_csim(ObjectList_t *list, gpointer param,
OutputFunc_t output);
void object_list_write_ncsa(ObjectList_t *list, gpointer param,
OutputFunc_t output);
 
typedef void (*ObjectListCallbackFunc_t)(Object_t*, gpointer);
 
gpointer object_list_add_changed_cb(ObjectList_t *list,
ObjectListCallbackFunc_t func,
ObjectListCallbackFunc_t func,
gpointer data);
 
void object_list_remove_add_cb(ObjectList_t *list, gpointer id);
void object_list_remove_select_cb(ObjectList_t *list, gpointer id);
void object_list_remove_move_cb(ObjectList_t *list, gpointer id);
void object_list_remove_geometry_cb(ObjectList_t *list, gpointer id);
 
#define object_list_clear_changed(list) ((list)->changed = FALSE)
#define object_list_set_changed(list, ischanged) \
((list)->changed = (ischanged))
#define object_list_get_changed(list) ((list)->changed)
 
void clear_paste_buffer(void);
gpointer paste_buffer_add_add_cb(ObjectListCallbackFunc_t func, gpointer data);
gpointer data);
ObjectList_t *get_paste_buffer(void);
 
void do_object_locked_dialog(void);
 
#endif /* _IMAP_OBJECT_H */
 
 
</pre>
#include "config.h"
 
#include <gtk/gtk.h>
 
#include "imap_commands.h"
#include "imap_default_dialog.h"
#include "imap_object.h"
#include "imap_string.h"
 
static Object_t* object_factory_create_object (ObjectFactory_t *factory,
gint x, gint y);
 
 
typedef struct {
ObjectListCallbackFunc_t func; gpointer data;...
} ObjectListCB_t;
 
static ObjectList_t *_paste_buffer;
 
static gpointer
object_list_callback_add(ObjectListCallback_t *list,
ObjectListCallbackFunc_t func, gpointer data)
{
ObjectListCB_t *cb = g_new(ObjectListCB_t, 1); cb->func = func; cb->data = data; list->list = g_list_append(list->list, cb); return cb;...
}
 
static void
object_list_callback_remove(ObjectListCallback_t *list, gpointer id)
{
list->list = g_list_remove(list->list, id);...
}
 
static void
object_list_callback_call(ObjectListCallback_t *list, Object_t *obj)
{
GList *p; for (p = list->list; p; p = p->next) { ObjectListCB_t *cb = (ObjectListCB_t*) p->data; cb->func(obj, cb->data); }...
}
 
gpointer
object_list_add_changed_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->changed_cb, func, data);...
}
 
gpointer
object_list_add_update_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->update_cb, func, data);...
}
 
gpointer
object_list_add_add_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->add_cb, func, data);...
}
 
gpointer
object_list_add_remove_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->remove_cb, func, data);...
}
 
gpointer
object_list_add_select_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->select_cb, func, data);...
}
 
gpointer
object_list_add_move_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->move_cb, func, data);...
}
 
gpointer
object_list_add_geometry_cb(ObjectList_t *list, ObjectListCallbackFunc_t func,
gpointer data)
{
return object_list_callback_add(&list->geometry_cb, func, data);...
}
 
gpointer
paste_buffer_add_add_cb(ObjectListCallbackFunc_t func, gpointer data)
{
if (!_paste_buffer) _paste_buffer = make_object_list(); return object_list_callback_add(&_paste_buffer->add_cb, func, data);...
}
 
gpointer
paste_buffer_add_remove_cb(ObjectListCallbackFunc_t func, gpointer data)
{
if (!_paste_buffer) _paste_buffer = make_object_list(); return object_list_callback_add(&_paste_buffer->remove_cb, func, data);...
}
 
void
object_list_remove_add_cb(ObjectList_t *list, gpointer id)
{
object_list_callback_remove(&list->add_cb, id);...
}
 
void
object_list_remove_select_cb(ObjectList_t *list, gpointer id)
{
object_list_callback_remove(&list->select_cb, id);...
}
 
void
object_list_remove_remove_cb(ObjectList_t *list, gpointer id)
{
object_list_callback_remove(&list->remove_cb, id);...
}
 
void
object_list_remove_move_cb(ObjectList_t *list, gpointer id)
{
object_list_callback_remove(&list->move_cb, id);...
}
 
void
object_list_remove_geometry_cb(ObjectList_t *list, gpointer id)
{
object_list_callback_remove(&list->geometry_cb, id);...
}
 
Object_t*
object_init(Object_t *obj, ObjectClass_t *class)
{
obj->class = class; obj->refcount = 1; obj->selected = FALSE; obj->locked = FALSE; obj->url = g_strdup(""); obj->target = g_strdup(""); obj->comment = g_strdup(""); obj->mouse_over = g_strdup(""); obj->mouse_out = g_strdup(""); obj->focus = g_strdup(""); obj->blur = g_strdup(""); return obj;...
}
 
static void
object_destruct(Object_t *obj)
{
if (obj->class->destruct) obj->class->destruct(obj); g_free(obj->url); g_free(obj->target); g_free(obj->comment); g_free(obj->mouse_over); g_free(obj->mouse_out); g_free(obj->focus); g_free(obj->blur); g_free(obj);...
}
 
Object_t*
object_ref(Object_t *obj)
{
obj->refcount++; return obj;...
}
 
void
object_unref(Object_t *obj)
{
if (!--obj->refcount) object_destruct(obj);...
}
************************************************************************************************************************************************************************************************************************************************************ Implementing a Clone method to return a new instance of Object_t ************************************************************************************************************************************************************************************************************************************************************
Object_t*
object_clone(Object_t *obj)
object_copy(Object_t *src, Object_t *des)
{
des->class = src->class; des->selected = src->selected; des->locked = FALSE; g_strreplace(&des->url, src->url); g_strreplace(&des->target, src->target); g_strreplace(&des->comment, src->comment); g_strreplace(&des->mouse_over, src->mouse_over); g_strreplace(&des->mouse_out, src->mouse_out); g_strreplace(&des->focus, src->focus); g_strreplace(&des->blur, src->blur); return des;...
}
 
Object_t*
object_assign(Object_t *obj, Object_t *des)
{
obj->class->assign(obj, des); return object_copy(obj, des);...
}
 
void
object_draw(Object_t *obj, GdkWindow *window)
{
PreferencesData_t *preferences = get_preferences(); GdkGC *gc = (obj->selected) ? preferences->selected_gc : preferences->normal_gc; obj->class->draw(obj, window, gc); if (obj->selected && preferences->show_area_handle) obj->class->draw_sashes(obj, window, gc);...
}
 
void
object_edit(Object_t *obj, gboolean add)
{
if (!obj->class->info_dialog) obj->class->info_dialog = create_edit_area_info_dialog(obj); edit_area_info_dialog_show(obj->class->info_dialog, obj, add);...
}
 
void
object_select(Object_t *obj)
{
obj->selected = TRUE; object_list_callback_call(&obj->list->select_cb, obj); object_emit_geometry_signal(obj);...
}
 
void
object_unselect(Object_t *obj)
{
obj->selected = FALSE; object_list_callback_call(&obj->list->select_cb, obj); object_emit_geometry_signal(obj);...
}
 
void
object_move(Object_t *obj, gint dx, gint dy)
{
obj->class->move(obj, dx, dy); object_emit_geometry_signal(obj);...
}
 
void
object_remove(Object_t *obj)
{
object_list_remove(obj->list, obj); object_emit_geometry_signal(obj);...
}
 
void
object_lock(Object_t *obj)
{
obj->locked = TRUE;...
}
 
void
object_unlock(Object_t *obj)
obj->locked = FALSE;
}
 
void
object_set_url(Object_t *obj, const gchar *url)
{
g_strreplace(&obj->url, url);...
}
 
void
object_set_target(Object_t *obj, const gchar *target)
{
g_strreplace(&obj->target, target);...
}
 
void
object_set_comment(Object_t *obj, const gchar *comment)
{
g_strreplace(&obj->comment, comment);...
}
 
void
object_set_mouse_over(Object_t *obj, const gchar *mouse_over)
{
g_strreplace(&obj->mouse_over, mouse_over);...
}
 
void
object_set_mouse_out(Object_t *obj, const gchar *mouse_out)
object_set_focus(Object_t *obj, const gchar *focus)
{
g_strreplace(&obj->focus, focus);...
}
 
void
object_set_blur(Object_t *obj, const gchar *blur)
{
g_strreplace(&obj->blur, blur);...
}
 
gint
object_get_position_in_list(Object_t *obj)
{
return g_list_index(obj->list->list, (gpointer) obj);...
}
 
void
object_emit_changed_signal(Object_t *obj)
{
object_list_callback_call(&obj->list->changed_cb, obj);...
}
 
void
object_emit_geometry_signal(Object_t *obj)
{
object_list_callback_call(&obj->list->geometry_cb, obj);...
}
 
void
object_emit_update_signal(Object_t *obj)
{
object_list_callback_call(&obj->list->update_cb, obj);...
}
 
void
do_object_locked_dialog(void)
{
static DefaultDialog_t *dialog; if (!dialog) { dialog = make_default_dialog("Object locked"); default_dialog_hide_cancel_button(dialog); default_dialog_hide_apply_button(dialog); default_dialog_set_label( dialog, "\n You cannot delete the selected object \n" "since it is currently being edited.\n"); } default_dialog_show(dialog);..
}
 
Object_t*
object_factory_create_object(ObjectFactory_t *factory, gint x, gint y)
{
return factory->obj = factory->create_object(x, y);...
}
 
static gboolean
button_motion(GtkWidget *widget, GdkEventMotion *event,
ObjectFactory_t *factory)
{
gint x = get_real_coord((gint) event->x); gint y = get_real_coord((gint) event->y);  round_to_grid(&x, &y);  object_draw(factory->obj, widget->window); factory->set_xy(factory->obj, event->state, x, y); object_draw(factory->obj, widget->window);  return FALSE;...
}
 
gboolean
object_on_button_press(GtkWidget *widget, GdkEventButton *event, gpointer data)
{
static ObjectFactory_t *factory; PreferencesData_t *preferences = get_preferences(); gint x = get_real_coord((gint) event->x); gint y = get_real_coord((gint) event->y); static Object_t *obj;  if (event->type == GDK_2BUTTON_PRESS) return FALSE; round_to_grid(&x, &y);  if (obj) { if (event->button == 1) { if (!factory->finish || factory->finish(obj, x, y)) { g_signal_handlers_disconnect_by_func(widget, button_motion, factory); if (object_is_valid(obj)) { Command_t *command = create_command_new(get_shapes(), obj); command_execute(command); if (preferences->prompt_for_area_info) object_edit(obj, FALSE); } else { object_draw(obj, widget->window); object_unref(obj); } gdk_gc_set_function(preferences->normal_gc, GDK_COPY); obj = NULL; main_clear_dimension(); } } else if (event->button == 3) { object_draw(obj, widget->window); if (!factory->cancel || factory->cancel(event, obj)) { g_signal_handlers_disconnect_by_func(widget, button_motion, factory); object_unref(obj); gdk_gc_set_function(preferences->normal_gc, GDK_COPY); obj = NULL; main_clear_dimension(); } else { object_draw(obj, widget->window); } } } else { if (event->button == 1) { factory = ((ObjectFactory_t*(*)(guint)) data)(event->state); obj = object_factory_create_object(factory, x, y); gdk_gc_set_function(preferences->normal_gc, GDK_XOR);  g_signal_connect(widget, "motion-notify-event", G_CALLBACK(button_motion), factory); } } return FALSE;...
}
 
ObjectList_t*
make_object_list(void)
{
return g_new0 (ObjectList_t, 1);...
}
 
void
object_list_destruct(ObjectList_t *list)
{
object_list_remove_all(list); g_free(list->list);...
}
 
ObjectList_t*
object_list_append_list(ObjectList_t *des, ObjectList_t *src)
{
GList *p; for (p = src->list; p; p = p->next) object_list_append(des, object_clone((Object_t*) p->data)); object_list_set_changed(des, (src) ? TRUE : FALSE); return des;...
}
 
ObjectList_t*
object_list_copy(ObjectList_t *des, ObjectList_t *src)
{
if (des) object_list_remove_all(des); else des = make_object_list();  return object_list_append_list(des, src);...
}
 
void
object_list_append(ObjectList_t *list, Object_t *object)
{
object->list = list; list->list = g_list_append(list->list, (gpointer) object); object_list_set_changed(list, TRUE); object_list_callback_call(&list->add_cb, object);...
}
 
void
object_list_prepend(ObjectList_t *list, Object_t *object)
{
object->list = list; list->list = g_list_prepend(list->list, (gpointer) object); object_list_set_changed(list, TRUE); object_list_callback_call(&list->add_cb, object);...
}
 
void
object_list_insert(ObjectList_t *list, gint position, Object_t *object)
{
object->list = list; list->list = g_list_insert(list->list, (gpointer) object, position); object_list_set_changed(list, TRUE); object_list_callback_call(&list->add_cb, object);...
}
 
void
object_list_remove(ObjectList_t *list, Object_t *object)
{
list->list = g_list_remove(list->list, (gpointer) object); object_list_set_changed(list, TRUE); object_list_callback_call(&list->remove_cb, object); object_unref(object);...
}
 
void
object_list_remove_link(ObjectList_t *list, GList *link)
{
list->list = g_list_remove_link(list->list, link); object_list_set_changed(list, TRUE); object_list_callback_call(&list->remove_cb, (Object_t*) link->data);...
}
 
void
object_list_update(ObjectList_t *list, Object_t *object)
{
object_list_callback_call(&list->update_cb, object);...
}
 
void
object_list_draw(ObjectList_t *list, GdkWindow *window)
{
GList *p; for (p = list->list; p; p = p->next) object_draw((Object_t*) p->data, window);...
}
 
void
object_list_draw_selected(ObjectList_t *list, GdkWindow *window)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) object_draw(obj, window); }...
}
 
Object_t*
object_list_find(ObjectList_t *list, gint x, gint y)
{
Object_t *found = NULL; GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->class->point_is_on(obj, x, y)) found = obj; } return found;...
}
 
Object_t*
object_list_near_sash(ObjectList_t *list, gint x, gint y,
MoveSashFunc_t *sash_func)
{
Object_t *found = NULL; GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) { MoveSashFunc_t func = obj->class->near_sash(obj, x, y); if (func) { found = obj; *sash_func = func; } } } return found;...
}
 
void
object_list_remove_all(ObjectList_t *list)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; object_list_callback_call(&list->remove_cb, obj); object_unref(obj); } g_list_free(list->list); list->list = NULL; object_list_set_changed(list, TRUE);...
}
 
void
clear_paste_buffer(void)
{
if (_paste_buffer) object_list_remove_all(_paste_buffer); else _paste_buffer = make_object_list();...
}
 
ObjectList_t*
get_paste_buffer(void)
{
return _paste_buffer;...
}
 
gint
object_list_cut(ObjectList_t *list)
{
GList *p, *q; gint count = 0;  clear_paste_buffer(); for (p = list->list; p; p = q) { Object_t *obj = (Object_t*) p->data; q = p->next; if (obj->selected) { if (obj->locked) { do_object_locked_dialog(); } else { object_list_append(_paste_buffer, obj); object_list_remove_link(list, p); count++; } } } object_list_set_changed(list, (count) ? TRUE : FALSE); return count;...
}
 
void
object_list_copy_to_paste_buffer(ObjectList_t *list)
{
GList *p;  clear_paste_buffer(); for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) object_list_append(_paste_buffer, object_clone(obj)); }...
}
 
void
object_list_paste(ObjectList_t *list)
{
object_list_append_list(list, _paste_buffer);...
}
 
void
object_list_delete_selected(ObjectList_t *list)
{
GList *p, *q; for (p = list->list; p; p = q) { Object_t *obj = (Object_t*) p->data; q = p->next; if (obj->selected) { if (obj->locked) { do_object_locked_dialog(); } else { object_list_remove_link(list, p); object_unref(obj); } } }...
}
 
void
object_list_edit_selected(ObjectList_t *list)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) { object_edit(obj, TRUE); break; } }...
}
 
gint
object_list_select_all(ObjectList_t *list)
{
GList *p; gint count = 0; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (!obj->selected) { object_select(obj); count++; } } return count;...
}
 
void
object_list_select_next(ObjectList_t *list)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) { object_unselect(obj); p = (p->next) ? p->next : list->list; object_select((Object_t*) p->data); for (p = p->next; p; p = p->next) { obj = (Object_t*) p->data; if (obj->selected) object_unselect(obj); } break; } }...
}
 
void object_list_select_prev(ObjectList_t *list)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) { GList *q = (p->prev) ? p->prev : g_list_last(list->list); for (; p; p = p->next) { obj = (Object_t*) p->data; if (obj->selected) object_unselect(obj); } object_select((Object_t*) q->data); break; } }...
}
 
gint
object_list_select_region(ObjectList_t *list, gint x, gint y, gint width,
gint height)
{
GList *p; gint count = 0; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; gint obj_x, obj_y, obj_width, obj_height;  object_get_dimensions(obj, &obj_x, &obj_y, &obj_width, &obj_height); if (obj_x >= x && obj_x + obj_width <= x + width && obj_y >= y && obj_y + obj_height <= y + height) { object_select(obj); count++; } } return count;...
}
 
gint
object_list_deselect_all(ObjectList_t *list, Object_t *exception)
{
GList *p; gint count = 0; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected && obj != exception) { object_unselect(obj); count++; } } return count;...
}
 
gint
object_list_nr_selected(ObjectList_t *list)
{
GList *p; gint count = 0; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) count++; } return count;...
}
 
void
object_list_resize(ObjectList_t *list, gint percentage_x, gint percentage_y)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; object_resize(obj, percentage_x, percentage_y); }...
}
 
static void
object_list_swap_prev(ObjectList_t *list, GList *p)
{
gpointer swap = p->data; p->data = p->prev->data; p->prev->data = swap; object_list_callback_call(&list->move_cb, (Object_t*) p->data); object_list_callback_call(&list->move_cb, (Object_t*) p->prev->data);...
}
 
static void
object_list_swap_next(ObjectList_t *list, GList *p)
{
gpointer swap = p->data; p->data = p->next->data; p->next->data = swap; object_list_callback_call(&list->move_cb, (Object_t*) p->data); object_list_callback_call(&list->move_cb, (Object_t*) p->next->data);...
}
 
void
object_list_move_selected(ObjectList_t *list, gint dx, gint dy)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected) object_move(obj, dx, dy); }...
}
 
void
object_list_move_up(ObjectList_t *list, Object_t *obj)
{
GList *p = g_list_find(list->list, (gpointer) obj); object_list_swap_prev(list, p);...
}
 
void
object_list_move_down(ObjectList_t *list, Object_t *obj)
{
GList *p = g_list_find(list->list, (gpointer) obj); object_list_swap_next(list, p);...
}
object_list_move_selected_up(ObjectList_t *list)
{
GList *p;  for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; if (obj->selected && p->prev) object_list_swap_prev(list, p); }...
}
 
void
object_list_move_selected_down(ObjectList_t *list)
{
GList *p;  for (p = g_list_last(list->list); p; p = p->prev) { Object_t *obj = (Object_t*) p->data; if (obj->selected && p->next) object_list_swap_next(list, p); }...
}
 
void
object_list_move_to_front(ObjectList_t *list)
{
GList *p, *q; guint length = g_list_length(list->list);  for (p = list->list; length; p = q, length--) { Object_t *obj = (Object_t*) p->data; q = p->next; if (obj->selected) { object_list_remove_link(list, p); object_list_append(list, obj); } }...
}
 
void
object_list_send_to_back(ObjectList_t *list)
{
GList *p, *q; guint length = g_list_length(list->list);  for (p = list->list; length; p = q, length--) { Object_t *obj = (Object_t*) p->data; q = p->next; if (obj->selected) { object_list_remove_link(list, p); object_list_prepend(list, obj); } }...
}
 
static void
write_xml_attrib(const gchar *attrib, const gchar *value,
OutputFunc_t output)
{
if (*value) { gchar *escaped_value = g_markup_escape_text(value, -1); output(param, " %s=\"%s\"", attrib, escaped_value); g_free(escaped_value); } else if (*default_text) { output(param, " %s", default_text); }...
}
 
void
object_list_write_csim(ObjectList_t *list, gpointer param, OutputFunc_t output)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data;  output(param, "<area shape="); obj->class->write_csim(obj, param, output);  write_xml_attrib("alt", obj->comment, "", param, output); write_xml_attrib("target", obj->target, "", param, output); write_xml_attrib("onmouseover", obj->mouse_over, "", param, output); write_xml_attrib("onmouseout", obj->mouse_out, "", param, output); write_xml_attrib("onfocus", obj->focus, "", param, output); write_xml_attrib("onblur", obj->blur, "", param, output); write_xml_attrib("href", obj->url, " nohref=\"nohref\"", param, output); output(param," />\n"); }...
}
 
void
object_list_write_cern(ObjectList_t *list, gpointer param, OutputFunc_t output)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data; obj->class->write_cern(obj, param, output); output(param, " %s\n", obj->url); }...
}
 
void
object_list_write_ncsa(ObjectList_t *list, gpointer param, OutputFunc_t output)
{
GList *p; for (p = list->list; p; p = p->next) { Object_t *obj = (Object_t*) p->data;  if (*obj->comment) output(param, "# %s\n", obj->comment); obj->class->write_ncsa(obj, param, output); output(param, "\n"); }...
}
 
</pre>
== Related Patterns ==
<ul>
<li>a[[http://zenit.senecac.on.ca/wiki/index.php/Composite Composite]]</li><br><li>b[[http://zenit.senecac.on.ca/wiki/index.php/Abstract_Factory Abstract Factory]]</li><br><li>c[[http://zenit.senecac.on.ca/wiki/index.php/Decorator Decorator]]</li><br>
<ul>
Aashaye1
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