gtkbin似乎无法从我的gtkwindow顶级小部件获取事件

我有一些问题，在这一刻，我试图用gtkbin在gtk中创建一个自定义小部件，所以我想知道是否有可能将gtkbin子类化，以及如何做到这一点。。。

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谢谢你的帮助。

我终于自己实现了这一点。下面是希望派生

gtkbin小部件

的人的方法

1） 理解小部件的层次结构很重要

>Hierarchy of widgets:  
GtkWidget <- GtkContainer <- GtkBin 

2） 我们必须看到，

GtkWidgetClass->get_preferred_width

和

GtkWidgetClass_preferred_width_height

的实现总是返回不正确的“0”

我们还看到，

GtkWidgetClass->size\u allocate

只为要派生的小部件分配大小，而不计算自定义小部件的子部件

您必须将这四个函数重写为所有函数才能正常工作

由于

GtkWindow

是直接从

GtkBin

派生的小部件，我们可以通过查看

GtkWindow.c

文件中相应的实现来实现我们的功能，并进行一些更改

以下是我的实现：

   widget_class->get_preferred_width = item_list_get_preferred_width;
   widget_class->get_preferred_height = item_list_get_preferred_height;
   widget_class->draw = dsn_itemlist_draw;
   widget_class->size_allocate = item_list_size_allocate;


void item_list_size_allocate (GtkWidget     *widget,
                          GtkAllocation *allocation)
{
  GtkAllocation child_allocation;
  GtkWidget *child;
  guint border_width;

  gtk_widget_set_allocation (widget, allocation);
  child = gtk_bin_get_child (GTK_BIN(widget));

  if (child && gtk_widget_get_visible (child))
    {
      border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
      child_allocation.x = border_width;
      child_allocation.y = border_width;
      child_allocation.width = MAX (1, allocation->width - border_width * 2);
      child_allocation.height = MAX (1, allocation->height - border_width * 2);

      gtk_widget_size_allocate (child, &child_allocation);
    }
}


gboolean dsn_itemlist_draw( GtkWidget *widget, cairo_t *cr)
{
   GtkWidget *child;
   GtkBin *bin = GTK_BIN(widget);
   GtkContainer *container = GTK_CONTAINER(widget);
   child = gtk_bin_get_child(bin);
   gtk_container_propagate_draw(container, child, cr);
   printf("bonnnnnnn\n");
   return TRUE;
}

void item_list_get_preferred_width(GtkWidget *widget,
                                gint      *minimum_size,
                                gint      *natural_size)
{
  //GtkWindow *window;
  GtkWidget *child;
  guint border_width;

  //window = GTK_WINDOW (widget);
  child  = gtk_bin_get_child (GTK_BIN (widget)/*(window)*/);

  border_width = 0;//gtk_container_get_border_width (GTK_CONTAINER (window));
  *minimum_size = border_width * 2;
  *natural_size = border_width * 2;

  if (child && gtk_widget_get_visible (child))
    {
      gint child_min, child_nat;
      gtk_widget_get_preferred_width (child, &child_min, &child_nat);

      *minimum_size += child_min;
      *natural_size += child_nat;
    }
}


void item_list_get_preferred_height(GtkWidget *widget,
                                gint      *minimum_size,
                                gint      *natural_size)
{
  //GtkWindow *window;
  GtkWidget *child;
  guint border_width;

  //window = GTK_WINDOW (widget);
  child  = gtk_bin_get_child (GTK_BIN (widget)/*(window)*/);

  border_width = 0;//gtk_container_get_border_width (GTK_CONTAINER (window));
  *minimum_size = border_width * 2;
  *natural_size = border_width * 2;

  if (child && gtk_widget_get_visible (child))
    {
      gint child_min, child_nat;
      gtk_widget_get_preferred_height (child, &child_min, &child_nat);

      *minimum_size += child_min;
      *natural_size += child_nat;
    }
}

注意：

在

init

函数中，我们必须告诉

gtk

我们的

小部件

没有窗口（

gdkwindow

），但它通过调用

gtk_widget_set_有_窗口（gtk_widget（此_实例），FALSE）

这就结束了

   widget_class->get_preferred_width = item_list_get_preferred_width;
   widget_class->get_preferred_height = item_list_get_preferred_height;
   widget_class->draw = dsn_itemlist_draw;
   widget_class->size_allocate = item_list_size_allocate;


void item_list_size_allocate (GtkWidget     *widget,
                          GtkAllocation *allocation)
{
  GtkAllocation child_allocation;
  GtkWidget *child;
  guint border_width;

  gtk_widget_set_allocation (widget, allocation);
  child = gtk_bin_get_child (GTK_BIN(widget));

  if (child && gtk_widget_get_visible (child))
    {
      border_width = gtk_container_get_border_width (GTK_CONTAINER (widget));
      child_allocation.x = border_width;
      child_allocation.y = border_width;
      child_allocation.width = MAX (1, allocation->width - border_width * 2);
      child_allocation.height = MAX (1, allocation->height - border_width * 2);

      gtk_widget_size_allocate (child, &child_allocation);
    }
}


gboolean dsn_itemlist_draw( GtkWidget *widget, cairo_t *cr)
{
   GtkWidget *child;
   GtkBin *bin = GTK_BIN(widget);
   GtkContainer *container = GTK_CONTAINER(widget);
   child = gtk_bin_get_child(bin);
   gtk_container_propagate_draw(container, child, cr);
   printf("bonnnnnnn\n");
   return TRUE;
}

void item_list_get_preferred_width(GtkWidget *widget,
                                gint      *minimum_size,
                                gint      *natural_size)
{
  //GtkWindow *window;
  GtkWidget *child;
  guint border_width;

  //window = GTK_WINDOW (widget);
  child  = gtk_bin_get_child (GTK_BIN (widget)/*(window)*/);

  border_width = 0;//gtk_container_get_border_width (GTK_CONTAINER (window));
  *minimum_size = border_width * 2;
  *natural_size = border_width * 2;

  if (child && gtk_widget_get_visible (child))
    {
      gint child_min, child_nat;
      gtk_widget_get_preferred_width (child, &child_min, &child_nat);

      *minimum_size += child_min;
      *natural_size += child_nat;
    }
}


void item_list_get_preferred_height(GtkWidget *widget,
                                gint      *minimum_size,
                                gint      *natural_size)
{
  //GtkWindow *window;
  GtkWidget *child;
  guint border_width;

  //window = GTK_WINDOW (widget);
  child  = gtk_bin_get_child (GTK_BIN (widget)/*(window)*/);

  border_width = 0;//gtk_container_get_border_width (GTK_CONTAINER (window));
  *minimum_size = border_width * 2;
  *natural_size = border_width * 2;

  if (child && gtk_widget_get_visible (child))
    {
      gint child_min, child_nat;
      gtk_widget_get_preferred_height (child, &child_min, &child_nat);

      *minimum_size += child_min;
      *natural_size += child_nat;
    }
}