gtkhandlebox.c

gtk是linux一款强大的夸平台的图形化开发工具

  hb = GTK_HANDLE_BOX (widget);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      if (hb->child_detached)
	{
	  /* The area parameter does not make sense in this case, so we
	   * repaint everything.
	   */

	  gtk_handle_box_draw_ghost (hb);

	  area->x = 0;
	  area->y = 0;
	  area->width = 2 * GTK_CONTAINER (hb)->border_width + DRAG_HANDLE_SIZE;
	  area->height = area->width + GTK_BIN (hb)->child->allocation.height;
	  area->width += GTK_BIN (hb)->child->allocation.width;

	  gtk_handle_box_paint (widget, NULL, area);
	}
      else
	gtk_handle_box_paint (widget, NULL, area);
    }
}

static gint
gtk_handle_box_expose (GtkWidget      *widget,
		       GdkEventExpose *event)
{
  GtkHandleBox *hb;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_HANDLE_BOX (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (GTK_WIDGET_DRAWABLE (widget))
    {
      hb = GTK_HANDLE_BOX (widget);

      if (event->window == widget->window)
	{
	  if (hb->child_detached)
	    gtk_handle_box_draw_ghost (hb);
	}
      else
	gtk_handle_box_paint (widget, event, NULL);
    }
  
  return FALSE;
}

static gint
gtk_handle_box_button_changed (GtkWidget      *widget,
			       GdkEventButton *event)
{
  GtkHandleBox *hb;
  gboolean event_handled;
  GdkCursor *fleur;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_HANDLE_BOX (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  hb = GTK_HANDLE_BOX (widget);

  event_handled = FALSE;
  if ((event->button == 1) && 
      (event->type == GDK_BUTTON_PRESS || event->type == GDK_2BUTTON_PRESS))
    {
      GtkWidget *child;
      gboolean in_handle;
      
      if (event->window != hb->bin_window)
	return FALSE;

      child = GTK_BIN (hb)->child;
      
      switch (hb->handle_position)
	{
	case GTK_POS_LEFT:
	  in_handle = event->x < DRAG_HANDLE_SIZE;
	  break;
	case GTK_POS_TOP:
	  in_handle = event->y < DRAG_HANDLE_SIZE;
	  break;
	case GTK_POS_RIGHT:
	  in_handle = event->x > 2 * GTK_CONTAINER (hb)->border_width + child->allocation.width;
	  break;
	case GTK_POS_BOTTOM:
	  in_handle = event->y > 2 * GTK_CONTAINER (hb)->border_width + child->allocation.height;
	  break;
	default:
	  in_handle = FALSE;
	  break;
	}

      if (!child)
	{
	  in_handle = FALSE;
	  event_handled = TRUE;
	}
      
      if (in_handle)
	{
	  if (event->type == GDK_BUTTON_PRESS) /* Start a drag */
	    {
	      gint desk_x, desk_y;
	      gint root_x, root_y;
	      gint width, height;
	      
	      gdk_window_get_deskrelative_origin (hb->bin_window, &desk_x, &desk_y);
	      gdk_window_get_origin (hb->bin_window, &root_x, &root_y);
	      gdk_window_get_size (hb->bin_window, &width, &height);
	      
	      hb->float_allocation.x = root_x - event->x_root;
	      hb->float_allocation.y = root_y - event->y_root;
	      hb->float_allocation.width = width;
	      hb->float_allocation.height = height;
	      
	      hb->deskoff_x = desk_x - root_x;
	      hb->deskoff_y = desk_y - root_y;
	      
	      gdk_window_get_origin (widget->window, &root_x, &root_y);
	      gdk_window_get_size (widget->window, &width, &height);
	      
	      hb->attach_allocation.x = root_x;
	      hb->attach_allocation.y = root_y;
	      hb->attach_allocation.width = width;
	      hb->attach_allocation.height = height;

	      hb->in_drag = TRUE;
	      fleur = gdk_cursor_new (GDK_FLEUR);
	      if (gdk_pointer_grab (widget->window,
				    FALSE,
				    (GDK_BUTTON1_MOTION_MASK |
				     GDK_POINTER_MOTION_HINT_MASK |
				     GDK_BUTTON_RELEASE_MASK),
				    NULL,
				    fleur,
				    GDK_CURRENT_TIME) != 0)
		{
		  hb->in_drag = FALSE;
		}
	      
	      gdk_cursor_destroy (fleur);
	      event_handled = TRUE;
	    }
	  else if (hb->child_detached) /* Double click */
	    {
	      gtk_handle_box_reattach (hb);
	    }
	}
    }
  else if (event->type == GDK_BUTTON_RELEASE &&
	   hb->in_drag)
    {
      if (event->window != widget->window)
	return FALSE;
      
      gdk_pointer_ungrab (GDK_CURRENT_TIME);
      hb->in_drag = FALSE;
      event_handled = TRUE;
    }
  
  return event_handled;
}

static gint
gtk_handle_box_motion (GtkWidget      *widget,
		       GdkEventMotion *event)
{
  GtkHandleBox *hb;
  gint new_x, new_y;
  gint snap_edge;
  gboolean is_snapped = FALSE;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_HANDLE_BOX (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  hb = GTK_HANDLE_BOX (widget);
  if (!hb->in_drag)
    return FALSE;

  if (!hb->in_drag || (event->window != widget->window))
    return FALSE;
  
  /* Calculate the attachment point on the float, if the float
   * were detached
   */
  new_x = 0;
  new_y = 0;
  gdk_window_get_pointer (GDK_ROOT_PARENT(), &new_x, &new_y, NULL);
  new_x += hb->float_allocation.x;
  new_y += hb->float_allocation.y;

  snap_edge = hb->snap_edge;
  if (snap_edge == -1)
    snap_edge = (hb->handle_position == GTK_POS_LEFT ||
		  hb->handle_position == GTK_POS_RIGHT) ?
      GTK_POS_TOP : GTK_POS_LEFT;

  /* First, check if the snapped edge is aligned
   */
  switch (snap_edge)
    {
    case GTK_POS_TOP:
      is_snapped = abs (hb->attach_allocation.y - new_y) < TOLERANCE;
      break;
    case GTK_POS_BOTTOM:
      is_snapped = abs (hb->attach_allocation.y + (gint)hb->attach_allocation.height -
			new_y - (gint)hb->float_allocation.height) < TOLERANCE;
      break;
    case GTK_POS_LEFT:
      is_snapped = abs (hb->attach_allocation.x - new_x) < TOLERANCE;
      break;
    case GTK_POS_RIGHT:
      is_snapped = abs (hb->attach_allocation.x + (gint)hb->attach_allocation.width -
			new_x - (gint)hb->float_allocation.width) < TOLERANCE;
      break;
    }

  /* Next, check if coordinates in the other direction are sufficiently
   * aligned
   */
  if (is_snapped)
    {
      gint float_pos1 = 0;	/* Initialize to suppress warnings */
      gint float_pos2 = 0;
      gint attach_pos1 = 0;
      gint attach_pos2 = 0;
      
      switch (snap_edge)
	{
	case GTK_POS_TOP:
	case GTK_POS_BOTTOM:
	  attach_pos1 = hb->attach_allocation.x;
	  attach_pos2 = hb->attach_allocation.x + hb->attach_allocation.width;
	  float_pos1 = new_x;
	  float_pos2 = new_x + hb->float_allocation.width;
	  break;
	case GTK_POS_LEFT:
	case GTK_POS_RIGHT:
	  attach_pos1 = hb->attach_allocation.y;
	  attach_pos2 = hb->attach_allocation.y + hb->attach_allocation.height;
	  float_pos1 = new_y;
	  float_pos2 = new_y + hb->float_allocation.height;
	  break;
	}

      is_snapped = ((attach_pos1 - TOLERANCE < float_pos1) && 
		    (attach_pos2 + TOLERANCE > float_pos2)) ||
	           ((float_pos1 - TOLERANCE < attach_pos1) &&
		    (float_pos2 + TOLERANCE > attach_pos2));
    }

  if (is_snapped)
    {
      if (hb->child_detached)
	{
	  hb->child_detached = FALSE;
	  gdk_window_hide (hb->float_window);
	  gdk_window_reparent (hb->bin_window, widget->window, 0, 0);
	  hb->float_window_mapped = FALSE;
	  gtk_signal_emit (GTK_OBJECT (hb),
			   handle_box_signals[SIGNAL_CHILD_ATTACHED],
			   GTK_BIN (hb)->child);
	  
	  gtk_widget_queue_resize (widget);
	}
    }
  else
    {
      gint width, height;

      gdk_window_get_size (hb->float_window, &width, &height);
      new_x += hb->deskoff_x;
      new_y += hb->deskoff_y;

      switch (hb->handle_position)
	{
	case GTK_POS_LEFT:
	  new_y += ((gint)hb->float_allocation.height - height) / 2;
	  break;
	case GTK_POS_RIGHT:
	  new_x += (gint)hb->float_allocation.width - width;
	  new_y += ((gint)hb->float_allocation.height - height) / 2;
	  break;
	case GTK_POS_TOP:
	  new_x += ((gint)hb->float_allocation.width - width) / 2;
	  break;
	case GTK_POS_BOTTOM:
	  new_x += ((gint)hb->float_allocation.width - width) / 2;
	  new_y += (gint)hb->float_allocation.height - height;
	  break;
	}

      if (hb->child_detached)
	{
	  gdk_window_move (hb->float_window, new_x, new_y);
	  gdk_window_raise (hb->float_window);
	}
      else
	{
	  gint width;
	  gint height;
	  GtkRequisition child_requisition;

	  hb->child_detached = TRUE;

	  if (GTK_BIN (hb)->child)
	    gtk_widget_get_child_requisition (GTK_BIN (hb)->child, &child_requisition);
	  else
	    {
	      child_requisition.width = 0;
	      child_requisition.height = 0;
	    }      

	  width = child_requisition.width + 2 * GTK_CONTAINER (hb)->border_width;
	  height = child_requisition.height + 2 * GTK_CONTAINER (hb)->border_width;
	  gdk_window_move_resize (hb->float_window, new_x, new_y, width, height);
	  gdk_window_reparent (hb->bin_window, hb->float_window, 0, 0);
	  gdk_window_set_hints (hb->float_window, new_x, new_y, 0, 0, 0, 0, GDK_HINT_POS);
	  gdk_window_show (hb->float_window);
	  hb->float_window_mapped = TRUE;
#if	0
	  /* this extra move is neccessary if we use decorations, or our
	   * window manager insists on decorations.
	   */
	  gdk_flush ();
	  gdk_window_move (hb->float_window, new_x, new_y);
	  gdk_flush ();
#endif	/* 0 */
	  gtk_signal_emit (GTK_OBJECT (hb),
			   handle_box_signals[SIGNAL_CHILD_DETACHED],
			   GTK_BIN (hb)->child);
	  gtk_handle_box_draw_ghost (hb);
	  
	  gtk_widget_queue_resize (widget);
	}
    }

  return TRUE;
}

static void
gtk_handle_box_add (GtkContainer *container,
		    GtkWidget    *widget)
{
  g_return_if_fail (GTK_IS_HANDLE_BOX (container));
  g_return_if_fail (GTK_BIN (container)->child == NULL);
  g_return_if_fail (widget->parent == NULL);

  gtk_widget_set_parent_window (widget, GTK_HANDLE_BOX (container)->bin_window);
  GTK_CONTAINER_CLASS (parent_class)->add (container, widget);
}

static void
gtk_handle_box_remove (GtkContainer *container,
		       GtkWidget    *widget)
{
  g_return_if_fail (GTK_IS_HANDLE_BOX (container));
  g_return_if_fail (GTK_BIN (container)->child == widget);

  GTK_CONTAINER_CLASS (parent_class)->remove (container, widget);

  gtk_handle_box_reattach (GTK_HANDLE_BOX (container));
}

static gint
gtk_handle_box_delete_event (GtkWidget *widget,
			     GdkEventAny  *event)
{
  GtkHandleBox *hb;

  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_HANDLE_BOX (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  hb = GTK_HANDLE_BOX (widget);

  if (event->window == hb->float_window)
    {
      gtk_handle_box_reattach (hb);
      
      return TRUE;
    }

  return FALSE;
}

static void
gtk_handle_box_reattach (GtkHandleBox *hb)
{
  if (hb->child_detached)
    {
      hb->child_detached = FALSE;
      if (GTK_WIDGET_REALIZED (hb))
	{
	  gdk_window_hide (hb->float_window);
	  gdk_window_reparent (hb->bin_window, GTK_WIDGET (hb)->window, 0, 0);

	  if (GTK_BIN (hb)->child)
	    gtk_signal_emit (GTK_OBJECT (hb),
			     handle_box_signals[SIGNAL_CHILD_ATTACHED],
			     GTK_BIN (hb)->child);

	}
      hb->float_window_mapped = FALSE;
    }
  if (hb->in_drag)
    {
      gdk_pointer_ungrab (GDK_CURRENT_TIME);
      hb->in_drag = FALSE;
    }

  gtk_widget_queue_resize (GTK_WIDGET (hb));
}