gtkscrolledwindow.c

gtk是linux一款强大的夸平台的图形化开发工具

      if (old_adjustment == hadjustment)
	return;

      gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
				     GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
				     scrolled_window);
      gtk_range_set_adjustment (GTK_RANGE (scrolled_window->hscrollbar),
				hadjustment);
    }
  hadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar));
  gtk_signal_connect (GTK_OBJECT (hadjustment),
		      "changed",
		      GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
		      scrolled_window);
  gtk_scrolled_window_adjustment_changed (hadjustment, scrolled_window);
  
  if (bin->child)
    gtk_widget_set_scroll_adjustments (bin->child,
				       gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
				       gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
}

void
gtk_scrolled_window_set_vadjustment (GtkScrolledWindow *scrolled_window,
				     GtkAdjustment     *vadjustment)
{
  GtkBin *bin;

  g_return_if_fail (scrolled_window != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));
  if (vadjustment)
    g_return_if_fail (GTK_IS_ADJUSTMENT (vadjustment));
  else
    vadjustment = (GtkAdjustment*) gtk_object_new (GTK_TYPE_ADJUSTMENT, NULL);

  bin = GTK_BIN (scrolled_window);

  if (!scrolled_window->vscrollbar)
    {
      gtk_widget_push_composite_child ();
      scrolled_window->vscrollbar = gtk_vscrollbar_new (vadjustment);
      gtk_widget_set_composite_name (scrolled_window->vscrollbar, "vscrollbar");
      gtk_widget_pop_composite_child ();

      gtk_widget_set_parent (scrolled_window->vscrollbar, GTK_WIDGET (scrolled_window));
      gtk_widget_ref (scrolled_window->vscrollbar);
      gtk_widget_show (scrolled_window->vscrollbar);
    }
  else
    {
      GtkAdjustment *old_adjustment;
      
      old_adjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
      if (old_adjustment == vadjustment)
	return;

      gtk_signal_disconnect_by_func (GTK_OBJECT (old_adjustment),
				     GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
				     scrolled_window);
      gtk_range_set_adjustment (GTK_RANGE (scrolled_window->vscrollbar),
				vadjustment);
    }
  vadjustment = gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar));
  gtk_signal_connect (GTK_OBJECT (vadjustment),
		      "changed",
		      GTK_SIGNAL_FUNC (gtk_scrolled_window_adjustment_changed),
		      scrolled_window);
  gtk_scrolled_window_adjustment_changed (vadjustment, scrolled_window);

  if (bin->child)
    gtk_widget_set_scroll_adjustments (bin->child,
				       gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)),
				       gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)));
}

GtkAdjustment*
gtk_scrolled_window_get_hadjustment (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (scrolled_window != NULL, NULL);
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);

  return (scrolled_window->hscrollbar ?
	  gtk_range_get_adjustment (GTK_RANGE (scrolled_window->hscrollbar)) :
	  NULL);
}

GtkAdjustment*
gtk_scrolled_window_get_vadjustment (GtkScrolledWindow *scrolled_window)
{
  g_return_val_if_fail (scrolled_window != NULL, NULL);
  g_return_val_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window), NULL);

  return (scrolled_window->vscrollbar ?
	  gtk_range_get_adjustment (GTK_RANGE (scrolled_window->vscrollbar)) :
	  NULL);
}

void
gtk_scrolled_window_set_policy (GtkScrolledWindow *scrolled_window,
				GtkPolicyType      hscrollbar_policy,
				GtkPolicyType      vscrollbar_policy)
{
  g_return_if_fail (scrolled_window != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  if ((scrolled_window->hscrollbar_policy != hscrollbar_policy) ||
      (scrolled_window->vscrollbar_policy != vscrollbar_policy))
    {
      scrolled_window->hscrollbar_policy = hscrollbar_policy;
      scrolled_window->vscrollbar_policy = vscrollbar_policy;

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
    }
}

void
gtk_scrolled_window_set_placement (GtkScrolledWindow *scrolled_window,
				   GtkCornerType      window_placement)
{
  g_return_if_fail (scrolled_window != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (scrolled_window));

  if (scrolled_window->window_placement != window_placement)
    {
      scrolled_window->window_placement = window_placement;

      gtk_widget_queue_resize (GTK_WIDGET (scrolled_window));
    }
}

static void
gtk_scrolled_window_destroy (GtkObject *object)
{
  GtkScrolledWindow *scrolled_window;

  g_return_if_fail (object != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (object));

  scrolled_window = GTK_SCROLLED_WINDOW (object);

  gtk_widget_unparent (scrolled_window->hscrollbar);
  gtk_widget_unparent (scrolled_window->vscrollbar);
  gtk_widget_destroy (scrolled_window->hscrollbar);
  gtk_widget_destroy (scrolled_window->vscrollbar);

  GTK_OBJECT_CLASS (parent_class)->destroy (object);
}

static void
gtk_scrolled_window_finalize (GtkObject *object)
{
  GtkScrolledWindow *scrolled_window;

  scrolled_window = GTK_SCROLLED_WINDOW (object);

  gtk_widget_unref (scrolled_window->hscrollbar);
  gtk_widget_unref (scrolled_window->vscrollbar);

  GTK_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
gtk_scrolled_window_map (GtkWidget *widget)
{
  GtkScrolledWindow *scrolled_window;

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

  scrolled_window = GTK_SCROLLED_WINDOW (widget);

  /* chain parent class handler to map self and child */
  GTK_WIDGET_CLASS (parent_class)->map (widget);
  
  if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar) &&
      !GTK_WIDGET_MAPPED (scrolled_window->hscrollbar))
    gtk_widget_map (scrolled_window->hscrollbar);
  
  if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar) &&
      !GTK_WIDGET_MAPPED (scrolled_window->vscrollbar))
    gtk_widget_map (scrolled_window->vscrollbar);
}

static void
gtk_scrolled_window_unmap (GtkWidget *widget)
{
  GtkScrolledWindow *scrolled_window;

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

  scrolled_window = GTK_SCROLLED_WINDOW (widget);

  /* chain parent class handler to unmap self and child */
  GTK_WIDGET_CLASS (parent_class)->unmap (widget);
  
  if (GTK_WIDGET_MAPPED (scrolled_window->hscrollbar))
    gtk_widget_unmap (scrolled_window->hscrollbar);
  
  if (GTK_WIDGET_MAPPED (scrolled_window->vscrollbar))
    gtk_widget_unmap (scrolled_window->vscrollbar);
}

static void
gtk_scrolled_window_draw (GtkWidget    *widget,
			  GdkRectangle *area)
{
  GtkScrolledWindow *scrolled_window;
  GtkBin *bin;
  GdkRectangle child_area;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
  g_return_if_fail (area != NULL);
  
  scrolled_window = GTK_SCROLLED_WINDOW (widget);
  bin = GTK_BIN (widget);

  if (bin->child && GTK_WIDGET_VISIBLE (bin->child) &&
      gtk_widget_intersect (bin->child, area, &child_area))
    gtk_widget_draw (bin->child, &child_area);
  
  if (GTK_WIDGET_VISIBLE (scrolled_window->hscrollbar) &&
      gtk_widget_intersect (scrolled_window->hscrollbar, area, &child_area))
    gtk_widget_draw (scrolled_window->hscrollbar, &child_area);
  
  if (GTK_WIDGET_VISIBLE (scrolled_window->vscrollbar) &&
      gtk_widget_intersect (scrolled_window->vscrollbar, area, &child_area))
    gtk_widget_draw (scrolled_window->vscrollbar, &child_area);
}

static void
gtk_scrolled_window_forall (GtkContainer *container,
			    gboolean	  include_internals,
			    GtkCallback   callback,
			    gpointer      callback_data)
{
  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (container));
  g_return_if_fail (callback != NULL);

  GTK_CONTAINER_CLASS (parent_class)->forall (container,
					      include_internals,
					      callback,
					      callback_data);
  if (include_internals)
    {
      GtkScrolledWindow *scrolled_window;

      scrolled_window = GTK_SCROLLED_WINDOW (container);
      
      if (scrolled_window->vscrollbar)
	callback (scrolled_window->vscrollbar, callback_data);
      if (scrolled_window->hscrollbar)
	callback (scrolled_window->hscrollbar, callback_data);
    }
}

static void
gtk_scrolled_window_size_request (GtkWidget      *widget,
				  GtkRequisition *requisition)
{
  GtkScrolledWindow *scrolled_window;
  GtkBin *bin;
  gint extra_width;
  gint extra_height;
  GtkRequisition hscrollbar_requisition;
  GtkRequisition vscrollbar_requisition;
  GtkRequisition child_requisition;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SCROLLED_WINDOW (widget));
  g_return_if_fail (requisition != NULL);

  scrolled_window = GTK_SCROLLED_WINDOW (widget);
  bin = GTK_BIN (scrolled_window);

  extra_width = 0;
  extra_height = 0;
  requisition->width = 0;
  requisition->height = 0;
  
  gtk_widget_size_request (scrolled_window->hscrollbar,
			   &hscrollbar_requisition);
  gtk_widget_size_request (scrolled_window->vscrollbar,
			   &vscrollbar_requisition);
  
  if (bin->child && GTK_WIDGET_VISIBLE (bin->child))
    {
      static guint quark_aux_info = 0;

      if (!quark_aux_info)
	quark_aux_info = g_quark_from_static_string ("gtk-aux-info");

      gtk_widget_size_request (bin->child, &child_requisition);

      if (scrolled_window->hscrollbar_policy == GTK_POLICY_NEVER)
	requisition->width += child_requisition.width;
      else
	{
	  GtkWidgetAuxInfo *aux_info;

	  aux_info = gtk_object_get_data_by_id (GTK_OBJECT (bin->child), quark_aux_info);
	  if (aux_info && aux_info->width > 0)
	    {
	      requisition->width += aux_info->width;
	      extra_width = -1;
	    }
	  else
	    requisition->width += vscrollbar_requisition.width;
	}

      if (scrolled_window->vscrollbar_policy == GTK_POLICY_NEVER)
	requisition->height += child_requisition.height;
      else
	{
	  GtkWidgetAuxInfo *aux_info;

	  aux_info = gtk_object_get_data_by_id (GTK_OBJECT (bin->child), quark_aux_info);
	  if (aux_info && aux_info->height > 0)
	    {
	      requisition->height += aux_info->height;
	      extra_height = -1;
	    }
	  else