gtklayout.c

gtk是linux一款强大的夸平台的图形化开发工具

  container_class->forall = gtk_layout_forall;

  class->set_scroll_adjustments = gtk_layout_set_adjustments;

  widget_class->set_scroll_adjustments_signal =
    gtk_signal_new ("set_scroll_adjustments",
		    GTK_RUN_LAST,
		    object_class->type,
		    GTK_SIGNAL_OFFSET (GtkLayoutClass, set_scroll_adjustments),
		    gtk_marshal_NONE__POINTER_POINTER,
		    GTK_TYPE_NONE, 2, GTK_TYPE_ADJUSTMENT, GTK_TYPE_ADJUSTMENT);
}

static void
gtk_layout_init (GtkLayout *layout)
{
  layout->children = NULL;

  layout->width = 100;
  layout->height = 100;

  layout->hadjustment = NULL;
  layout->vadjustment = NULL;

  layout->bin_window = NULL;

  layout->configure_serial = 0;
  layout->scroll_x = 0;
  layout->scroll_y = 0;
  layout->visibility = GDK_VISIBILITY_PARTIAL;

  layout->freeze_count = 0;
}

/* Widget methods
 */

static void 
gtk_layout_realize (GtkWidget *widget)
{
  GList *tmp_list;
  GtkLayout *layout;
  GdkWindowAttr attributes;
  gint attributes_mask;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (widget));

  layout = GTK_LAYOUT (widget);
  GTK_WIDGET_SET_FLAGS (layout, GTK_REALIZED);

  attributes.window_type = GDK_WINDOW_CHILD;
  attributes.x = widget->allocation.x;
  attributes.y = widget->allocation.y;
  attributes.width = widget->allocation.width;
  attributes.height = widget->allocation.height;
  attributes.wclass = GDK_INPUT_OUTPUT;
  attributes.visual = gtk_widget_get_visual (widget);
  attributes.colormap = gtk_widget_get_colormap (widget);
  attributes.event_mask = GDK_VISIBILITY_NOTIFY_MASK;

  attributes_mask = GDK_WA_X | GDK_WA_Y | GDK_WA_VISUAL | GDK_WA_COLORMAP;

  widget->window = gdk_window_new (gtk_widget_get_parent_window (widget),
				   &attributes, attributes_mask);
  gdk_window_set_user_data (widget->window, widget);

  attributes.x = 0;
  attributes.y = 0;
  attributes.event_mask = GDK_EXPOSURE_MASK | 
                          gtk_widget_get_events (widget);

  layout->bin_window = gdk_window_new (widget->window,
					&attributes, attributes_mask);
  gdk_window_set_user_data (layout->bin_window, widget);

  widget->style = gtk_style_attach (widget->style, widget->window);
  gtk_style_set_background (widget->style, widget->window, GTK_STATE_NORMAL);
  gtk_style_set_background (widget->style, layout->bin_window, GTK_STATE_NORMAL);

  gdk_window_add_filter (widget->window, gtk_layout_main_filter, layout);
  gdk_window_add_filter (layout->bin_window, gtk_layout_filter, layout);

  /* XXX: If we ever get multiple displays for GTK+, then gravity_works
   *      will have to become a widget member. Right now we just
   *      keep it as a global
   */
  gravity_works = gdk_window_set_static_gravities (layout->bin_window, TRUE);

  tmp_list = layout->children;
  while (tmp_list)
    {
      GtkLayoutChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      gtk_widget_set_parent_window (child->widget, layout->bin_window);
    }
}

static void 
gtk_layout_map (GtkWidget *widget)
{
  GList *tmp_list;
  GtkLayout *layout;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (widget));

  layout = GTK_LAYOUT (widget);

  GTK_WIDGET_SET_FLAGS (widget, GTK_MAPPED);

  tmp_list = layout->children;
  while (tmp_list)
    {
      GtkLayoutChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      if (GTK_WIDGET_VISIBLE (child->widget))
	{
	  if (!GTK_WIDGET_MAPPED (child->widget) && 
	      !GTK_WIDGET_IS_OFFSCREEN (child->widget))
	    gtk_widget_map (child->widget);
	}
    }

  gdk_window_show (layout->bin_window);
  gdk_window_show (widget->window);
}

static void 
gtk_layout_unrealize (GtkWidget *widget)
{
  GtkLayout *layout;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (widget));

  layout = GTK_LAYOUT (widget);

  gdk_window_set_user_data (layout->bin_window, NULL);
  gdk_window_destroy (layout->bin_window);
  layout->bin_window = NULL;

  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}

static void     
gtk_layout_size_request (GtkWidget     *widget,
			 GtkRequisition *requisition)
{
  GList *tmp_list;
  GtkLayout *layout;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (widget));

  layout = GTK_LAYOUT (widget);

  requisition->width = 0;
  requisition->height = 0;

  tmp_list = layout->children;

  while (tmp_list)
    {
      GtkLayoutChild *child = tmp_list->data;
      GtkRequisition child_requisition;
      
      tmp_list = tmp_list->next;

      gtk_widget_size_request (child->widget, &child_requisition);
    }
}

static void     
gtk_layout_size_allocate (GtkWidget     *widget,
			  GtkAllocation *allocation)
{
  GList *tmp_list;
  GtkLayout *layout;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (widget));

  widget->allocation = *allocation;
  
  layout = GTK_LAYOUT (widget);

  tmp_list = layout->children;

  while (tmp_list)
    {
      GtkLayoutChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      gtk_layout_position_child (layout, child);
      gtk_layout_allocate_child (layout, child);
    }

  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
			      allocation->x, allocation->y,
			      allocation->width, allocation->height);
      gdk_window_move_resize (GTK_LAYOUT(widget)->bin_window,
			      0, 0,
			      allocation->width, allocation->height);
    }

  layout->hadjustment->page_size = allocation->width;
  layout->hadjustment->page_increment = allocation->width / 2;
  layout->hadjustment->lower = 0;
  layout->hadjustment->upper = layout->width;
  gtk_signal_emit_by_name (GTK_OBJECT (layout->hadjustment), "changed");

  layout->vadjustment->page_size = allocation->height;
  layout->vadjustment->page_increment = allocation->height / 2;
  layout->vadjustment->lower = 0;
  layout->vadjustment->upper = layout->height;
  gtk_signal_emit_by_name (GTK_OBJECT (layout->vadjustment), "changed");
}

static void 
gtk_layout_draw (GtkWidget *widget, GdkRectangle *area)
{
  GList *tmp_list;
  GtkLayout *layout;
  GdkRectangle child_area;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (widget));

  layout = GTK_LAYOUT (widget);

  /* We don't have any way of telling themes about this properly,
   * so we just assume a background pixmap
   */
  if (!GTK_WIDGET_APP_PAINTABLE (widget))
    gdk_window_clear_area (layout->bin_window,
			   area->x, area->y, area->width, area->height);
  
  tmp_list = layout->children;
  while (tmp_list)
    {
      GtkLayoutChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      if (gtk_widget_intersect (child->widget, area, &child_area))
	gtk_widget_draw (child->widget, &child_area);
    }
}

static gint 
gtk_layout_expose (GtkWidget *widget, GdkEventExpose *event)
{
  GList *tmp_list;
  GtkLayout *layout;
  GdkEventExpose child_event;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_LAYOUT (widget), FALSE);

  layout = GTK_LAYOUT (widget);

  if (event->window != layout->bin_window)
    return FALSE;
  
  tmp_list = layout->children;
  while (tmp_list)
    {
      GtkLayoutChild *child = tmp_list->data;
      tmp_list = tmp_list->next;

      child_event = *event;
      if (GTK_WIDGET_DRAWABLE (child->widget) &&
	  GTK_WIDGET_NO_WINDOW (child->widget) &&
	  gtk_widget_intersect (child->widget, &event->area, &child_event.area))
	gtk_widget_event (child->widget, (GdkEvent*) &child_event);
    }

  return FALSE;
}

/* Container method
 */
static void
gtk_layout_remove (GtkContainer *container, 
		   GtkWidget    *widget)
{
  GList *tmp_list;
  GtkLayout *layout;
  GtkLayoutChild *child = NULL;
  
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (container));
  
  layout = GTK_LAYOUT (container);

  tmp_list = layout->children;
  while (tmp_list)
    {
      child = tmp_list->data;
      if (child->widget == widget)
	break;
      tmp_list = tmp_list->next;
    }

  if (tmp_list)
    {
      GTK_PRIVATE_UNSET_FLAG (widget, GTK_IS_OFFSCREEN);

      gtk_widget_unparent (widget);

      layout->children = g_list_remove_link (layout->children, tmp_list);
      g_list_free_1 (tmp_list);
      g_free (child);
    }
}

static void
gtk_layout_forall (GtkContainer *container,
		   gboolean      include_internals,
		   GtkCallback   callback,
		   gpointer      callback_data)
{
  GtkLayout *layout;
  GtkLayoutChild *child;
  GList *tmp_list;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_LAYOUT (container));
  g_return_if_fail (callback != NULL);

  layout = GTK_LAYOUT (container);

  tmp_list = layout->children;
  while (tmp_list)
    {
      child = tmp_list->data;
      tmp_list = tmp_list->next;

      (* callback) (child->widget, callback_data);
    }
}

/* Operations on children
 */

static void
gtk_layout_position_child (GtkLayout      *layout,
			   GtkLayoutChild *child)
{
  gint x;
  gint y;

  x = child->x - layout->xoffset;
  y = child->y - layout->yoffset;

  if (IS_ONSCREEN (x,y))
    {
      if (GTK_WIDGET_MAPPED (layout) &&
	  GTK_WIDGET_VISIBLE (child->widget))
	{
	  if (!GTK_WIDGET_MAPPED (child->widget))
	    gtk_widget_map (child->widget);
	}

      if (GTK_WIDGET_IS_OFFSCREEN (child->widget))
	GTK_PRIVATE_UNSET_FLAG (child->widget, GTK_IS_OFFSCREEN);
    }
  else
    {
      if (!GTK_WIDGET_IS_OFFSCREEN (child->widget))
	GTK_PRIVATE_SET_FLAG (child->widget, GTK_IS_OFFSCREEN);

      if (GTK_WIDGET_MAPPED (child->widget))
	gtk_widget_unmap (child->widget);
    }
}

static void
gtk_layout_allocate_child (GtkLayout      *layout,
			   GtkLayoutChild *child)
{
  GtkAllocation allocation;
  GtkRequisition requisition;

  allocation.x = child->x - layout->xoffset;
  allocation.y = child->y - layout->yoffset;
  gtk_widget_get_child_requisition (child->widget, &requisition);
  allocation.width = requisition.width;
  allocation.height = requisition.height;
  
  gtk_widget_size_allocate (child->widget, &allocation);