gtkwindow.c

gtk是linux一款强大的夸平台的图形化开发工具

      requisition->height += child_requisition.height;
    }
}

static void
gtk_window_size_allocate (GtkWidget     *widget,
			  GtkAllocation *allocation)
{
  GtkWindow *window;
  GtkAllocation child_allocation;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_WINDOW (widget));
  g_return_if_fail (allocation != NULL);

  window = GTK_WINDOW (widget);
  widget->allocation = *allocation;

  if (window->bin.child && GTK_WIDGET_VISIBLE (window->bin.child))
    {
      child_allocation.x = GTK_CONTAINER (window)->border_width;
      child_allocation.y = GTK_CONTAINER (window)->border_width;
      child_allocation.width =
	MAX (1, (gint)allocation->width - child_allocation.x * 2);
      child_allocation.height =
	MAX (1, (gint)allocation->height - child_allocation.y * 2);

      gtk_widget_size_allocate (window->bin.child, &child_allocation);
    }
}

static gint
gtk_window_configure_event (GtkWidget         *widget,
			    GdkEventConfigure *event)
{
  GtkWindow *window;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_WINDOW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  window = GTK_WINDOW (widget);

  /* we got a configure event specifying the new window size and position,
   * in principle we have to distinguish 4 cases here:
   * 1) the size didn't change and resize_count == 0
   *    -> the window was merely moved (sometimes not even that)
   * 2) the size didn't change and resize_count > 0
   *    -> we requested a new size, but didn't get it
   * 3) the size changed and resize_count > 0
   *    -> we asked for a new size and we got one
   * 4) the size changed and resize_count == 0
   *    -> we got resized from outside the toolkit, and have to
   *    accept that size since we don't want to fight neither the
   *    window manager nor the user
   * in the three latter cases we have to reallocate the widget tree,
   * which happens in gtk_window_move_resize(), so we set a flag for
   * that function and assign the new size. if resize_count > 1,
   * we simply do nothing and wait for more configure events.
   */

  if (window->resize_count > 0 ||
      widget->allocation.width != event->width ||
      widget->allocation.height != event->height)
    {
      if (window->resize_count > 0)
	window->resize_count -= 1;

      if (window->resize_count == 0)
	{
	  window->handling_resize = TRUE;
	  
	  widget->allocation.width = event->width;
	  widget->allocation.height = event->height;
	  
	  gtk_widget_queue_resize (widget);
	}
    }

  return TRUE;
}

static gint
gtk_window_key_press_event (GtkWidget   *widget,
			    GdkEventKey *event)
{
  GtkWindow *window;
  GtkDirectionType direction = 0;
  gboolean handled;

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

  window = GTK_WINDOW (widget);

  handled = FALSE;
  
  if (window->focus_widget &&
      window->focus_widget != widget &&
      GTK_WIDGET_IS_SENSITIVE (window->focus_widget))
    {
      handled = gtk_widget_event (window->focus_widget, (GdkEvent*) event);
    }
    
  if (!handled)
    handled = gtk_accel_groups_activate (GTK_OBJECT (window), event->keyval, event->state);

  if (!handled)
    {
      switch (event->keyval)
	{
	case GDK_space:
	  if (window->focus_widget)
	    {
	      gtk_widget_activate (window->focus_widget);
	      handled = TRUE;
	    }
	  break;
	case GDK_Return:
	case GDK_KP_Enter:
	  if (window->default_widget &&
	      (!window->focus_widget || 
	       !GTK_WIDGET_RECEIVES_DEFAULT (window->focus_widget)))
	    {
	      gtk_widget_activate (window->default_widget);
	      handled = TRUE;
	    }
          else if (window->focus_widget)
	    {
	      gtk_widget_activate (window->focus_widget);
	      handled = TRUE;
	    }
	  break;
	case GDK_Up:
	case GDK_Down:
	case GDK_Left:
	case GDK_Right:
	case GDK_KP_Up:
	case GDK_KP_Down:
	case GDK_KP_Left:
	case GDK_KP_Right:
	case GDK_Tab:
	case GDK_ISO_Left_Tab:
	  switch (event->keyval)
	    {
	    case GDK_Up:
	    case GDK_KP_Up:
	      direction = GTK_DIR_UP;
	      break;
	    case GDK_Down:
	    case GDK_KP_Down:
	      direction = GTK_DIR_DOWN;
	      break;
	    case GDK_Left:
	    case GDK_KP_Left:
	      direction = GTK_DIR_LEFT;
	      break;
	    case GDK_Right:
	    case GDK_KP_Right:
	      direction = GTK_DIR_RIGHT;
	      break;
	    case GDK_Tab:
	    case GDK_ISO_Left_Tab:
	      if (event->state & GDK_SHIFT_MASK)
		direction = GTK_DIR_TAB_BACKWARD;
	      else
		direction = GTK_DIR_TAB_FORWARD;
              break;
            default :
              direction = GTK_DIR_UP; /* never reached, but makes compiler happy */
	    }

	  gtk_container_focus (GTK_CONTAINER (widget), direction);

	  if (!GTK_CONTAINER (window)->focus_child)
	    gtk_window_set_focus (GTK_WINDOW (widget), NULL);
	  else
	    handled = TRUE;
	  break;
	}
    }

  if (!handled && GTK_WIDGET_CLASS (parent_class)->key_press_event)
    handled = GTK_WIDGET_CLASS (parent_class)->key_press_event (widget, event);

  return handled;
}

static gint
gtk_window_key_release_event (GtkWidget   *widget,
			      GdkEventKey *event)
{
  GtkWindow *window;
  gint handled;
  
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_WINDOW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);
  
  window = GTK_WINDOW (widget);
  handled = FALSE;
  if (window->focus_widget &&
      window->focus_widget != widget &&
      GTK_WIDGET_SENSITIVE (window->focus_widget))
    {
      handled = gtk_widget_event (window->focus_widget, (GdkEvent*) event);
    }

  if (!handled && GTK_WIDGET_CLASS (parent_class)->key_release_event)
    handled = GTK_WIDGET_CLASS (parent_class)->key_release_event (widget, event);

  return handled;
}

static gint
gtk_window_enter_notify_event (GtkWidget        *widget,
			       GdkEventCrossing *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_WINDOW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  return FALSE;
}

static gint
gtk_window_leave_notify_event (GtkWidget        *widget,
			       GdkEventCrossing *event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_WINDOW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  return FALSE;
}

static gint
gtk_window_focus_in_event (GtkWidget     *widget,
			   GdkEventFocus *event)
{
  GtkWindow *window;
  GdkEventFocus fevent;

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

  /* It appears spurious focus in events can occur when
   *  the window is hidden. So we'll just check to see if
   *  the window is visible before actually handling the
   *  event
   */
  if (GTK_WIDGET_VISIBLE (widget))
    {
      window = GTK_WINDOW (widget);
      if (window->focus_widget &&
	  window->focus_widget != widget &&
	  !GTK_WIDGET_HAS_FOCUS (window->focus_widget))
	{
	  fevent.type = GDK_FOCUS_CHANGE;
	  fevent.window = window->focus_widget->window;
	  fevent.in = TRUE;

	  gtk_widget_event (window->focus_widget, (GdkEvent*) &fevent);
	}
    }

  return FALSE;
}

static gint
gtk_window_focus_out_event (GtkWidget     *widget,
			    GdkEventFocus *event)
{
  GtkWindow *window;
  GdkEventFocus fevent;

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

  window = GTK_WINDOW (widget);
  if (window->focus_widget &&
      window->focus_widget != widget &&
      GTK_WIDGET_HAS_FOCUS (window->focus_widget))
    {
      fevent.type = GDK_FOCUS_CHANGE;
      fevent.window = window->focus_widget->window;
      fevent.in = FALSE;

      gtk_widget_event (window->focus_widget, (GdkEvent*) &fevent);
    }

  return FALSE;
}

static GdkAtom atom_rcfiles = GDK_NONE;

static void
gtk_window_read_rcfiles (GtkWidget *widget,
			 GdkEventClient *event)
{
  GList *embedded_windows;

  embedded_windows = gtk_object_get_data (GTK_OBJECT (widget), "gtk-embedded");
  if (embedded_windows)
    {
      GdkEventClient sev;
      int i;
      
      for(i = 0; i < 5; i++)
	sev.data.l[i] = 0;
      sev.data_format = 32;
      sev.message_type = atom_rcfiles;
      
      while (embedded_windows)
	{
	  guint xid = GPOINTER_TO_UINT (embedded_windows->data);
	  gdk_event_send_client_message ((GdkEvent *) &sev, xid);
	  embedded_windows = embedded_windows->next;
	}
    }

  if (gtk_rc_reparse_all ())
    {
      /* If the above returned true, some of our RC files are out
       * of date, so we need to reset all our widgets. Our other
       * toplevel windows will also get the message, but by
       * then, the RC file will up to date, so we have to tell
       * them now.
       */
      GList *toplevels;
      
      toplevels = gtk_container_get_toplevels();
      while (toplevels)
	{
	  gtk_widget_reset_rc_styles (toplevels->data);
	  toplevels = toplevels->next;
	}
    }
}

static gint
gtk_window_client_event (GtkWidget	*widget,
			 GdkEventClient	*event)
{
  g_return_val_if_fail (widget != NULL, FALSE);
  g_return_val_if_fail (GTK_IS_WINDOW (widget), FALSE);
  g_return_val_if_fail (event != NULL, FALSE);

  if (!atom_rcfiles)
    atom_rcfiles = gdk_atom_intern("_GTK_READ_RCFILES", FALSE);

  if(event->message_type == atom_rcfiles) 
    gtk_window_read_rcfiles (widget, event);    

  return FALSE;
}

static void
gtk_window_check_resize (GtkContainer *container)
{
  GtkWindow *window;

  g_return_if_fail (container != NULL);
  g_return_if_fail (GTK_IS_WINDOW (container));

  window = GTK_WINDOW (container);

  if (GTK_WIDGET_VISIBLE (container))
    gtk_window_move_resize (window);
}

static void
gtk_window_real_set_focus (GtkWindow *window,
			   GtkWidget *focus)
{
  GdkEventFocus event;
  gboolean def_flags = 0;

  g_return_if_fail (window != NULL);
  g_return_if_fail (GTK_IS_WINDOW (window));
  
  if (window->default_widget)
    def_flags = GTK_WIDGET_HAS_DEFAULT (window->default_widget);
  
  if (window->focus_widget)
    {
      event.type = GDK_FOCUS_CHANGE;
      event.window = window->focus_widget->window;
      event.in = FALSE;
      
      if (GTK_WIDGET_RECEIVES_DEFAULT (window->focus_widget) &&
	  (window->focus_widget != window->default_widget))
        {
	  GTK_WIDGET_UNSET_FLAGS (window->focus_widget, GTK_HAS_DEFAULT);
	  /* if any widget had the default set there should be
	     a default_widget, but might not so this is a sanity
	     check */
	  if (window->default_widget)
	    GTK_WIDGET_SET_FLAGS (window->default_widget, GTK_HAS_DEFAULT);
        }
	
      gtk_widget_event (window->focus_widget, (GdkEvent*) &event);
    }
  
  window->focus_widget = focus;
  
  if (window->focus_widget)
    {
      event.type = GDK_FOCUS_CHANGE;
      event.window = window->focus_widget->window;
      event.in = TRUE;

      if (window->default_widget)
        {
          if (GTK_WIDGET_RECEIVES_DEFAULT (window->focus_widget) &&
	      (window->focus_widget != window->default_widget))
            {
	      if (GTK_WIDGET_CAN_DEFAULT (window->focus_widget))
	        GTK_WIDGET_SET_FLAGS (window->focus_widget, GTK_HAS_DEFAULT);
	      GTK_WIDGET_UNSET_FLAGS (window->default_widget, GTK_HAS_DEFAULT);
            }
	  else
	    {
	      GTK_WIDGET_SET_FLAGS (window->default_widget, GTK_HAS_DEFAULT);
	    }
	}
      
      gtk_widget_event (window->focus_widget, (GdkEvent*) &event);
    }
  else if (window->default_widget)
    {
      GTK_WIDGET_SET_FLAGS (window->default_widget, GTK_HAS_DEFAULT);
    }
  
  if (window->default_widget &&
      (def_flags != GTK_WIDGET_FLAGS (window->default_widget)))
    gtk_widget_queue_draw (window->default_widget);
}

/*********************************
 * Functions related to resizing *
 *********************************/

static void
gtk_window_move_resize (GtkWindow *window)
{
  GtkWidget *widget;
  GtkContainer *container;
  GtkWindowGeometryInfo *info;
  GtkWindowLastGeometryInfo saved_last_info;
  GdkGeometry new_geometry;
  guint new_flags;
  gint x, y;
  gint width, height;
  gint new_width, new_height;
  gboolean default_size_changed = FALSE;
  gboolean hints_changed = FALSE;

  g_return_if_fail (GTK_IS_WINDOW (window));
  g_return_if_fail (GTK_WIDGET_REALIZED (window));

  widget = GTK_WIDGET (window);
  container = GTK_CONTAINER (widget);
  info = gtk_window_get_geometry_info (window, TRUE);
  saved_last_info = info->last;

  gtk_widget_size_request (widget, NULL);
  gtk_window_compute_default_size (window, &new_width, &new_height);
  
  if (info->last.width < 0 ||
      info->last.width != new_width ||
      info->last.height != new_height)
    {
      default_size_changed = TRUE;
      info->last.width = new_width;
      info->last.height = new_height;

      /* We need to force a reposition in this case
       */
      if (window->position == GTK_WIN_POS_CENTER_ALWAYS)
	window->use_uposition = TRUE;
    }
  
  /* Compute new set of hints for the window
   */
  gtk_window_compute_hints (window, &new_geometry, &new_flags);
  if (!gtk_window_compare_hints (&info->last.geometry, info->last.flags,
				 &new_geometry, new_flags))
    {
      hints_changed = TRUE;
      info->last.geometry = new_geometry;
      info->last.flags = new_flags;
    }

  /* From the default size and the allocation, figure out the size
   * the window should be.
   */
  if (!default_size_changed ||
      (!window->auto_shrink &&
       new_width <= widget->allocation.width &&
       new_height <= widget->allocation.height))
    {
      new_width = widget->allocation.width;
      new_height = widget->allocation.height;
    }

  /* constrain the window size to the specified geometry */
  gtk_window_constrain_size (window,
			     &new_geometry, new_flags,
			     new_width, new_height,
			     &new_width, &new_height);

  /* compute new window position if a move is required
   */
  gtk_window_compute_reposition (window, new_width, new_height, &x, &y);
  if (x != 1 && y != -1 && !(new_flags & GDK_HINT_POS))
    {
      new_flags |= GDK_HINT_POS;
      hints_changed = TRUE;
    }


  /* handle actual resizing:
   * - handle reallocations due to configure events
   * - figure whether we need to request a new window size
   * - handle simple resizes within our widget tree
   * - reposition window if neccessary
   */
  width = widget->allocation.width;
  height = widget->allocation.height;