static si_t
handle_window_cancel
(union message * msg)
{
struct widget* w;
w = application_widgets_for_each_increament(do_find_window, msg);
if(w->callback != NULL)
w->callback(w, msg);
/* 如果要关闭主窗口 */
if(global_application.main_window == WINDOW_POINTER(w))
{
application_del_window(WINDOW_POINTER(w));
}
else
{
cancel_window(WINDOW_POINTER(w)->descriptor);
application_del_window(WINDOW_POINTER(w));
/* 没有顶层窗口了 */
/* 退出程序 */
/* 这是为了处理没有设置主窗口的情况 */
if(vector_size(&(global_application.window_vector)) == 0)
{
application_exit();
}
/* 还有顶层窗口 */
else
{
application_widgets_for_each_increament(do_dispatch_repaint_event_to_all, NULL);
}
}
return 0;
}
/*
如果 window 有左子节点
那么这个左子节点并不是 window 子对象
所以在析构以 window 为根的树之前一定要要将 window->lchild 成员清空
如果 window 在对象树中
那么完成删除工作后一定要更新 root->parent 的 lchild 成员和 rchild 成员
这是为了保证遍历的正确
*/
si_t application_del_window(struct window * window)
{
si_t is_top_window = 0;
/* 删除主窗口 */
/* 退出程序 */
if(window == global_application.main_window)
{
application_exit();
return 0;
}
if(window->parent->parent == OBJECT_POINTER(window))
{
is_top_window = 1;
}
cancel_window(window->descriptor);
object_delete(OBJECT_POINTER(window), __widget_destructor);
if(is_top_window)
{
si_t i = 0, n = 0;
/* 有多少个窗口 */
n = vector_size(&(global_application.window_vector));
/* 找到这个窗口在向量中的索引 */
for(i = 0; i < n; ++ i)
{
struct object* tree = vector_at(&(global_application.window_vector), i);
if(tree->parent == OBJECT_POINTER(window))
{
/* 从窗口向量中删除这个节点 */
vector_erase(&(global_application.window_vector), i);
break;
}
}
}
return 0;
}
