gtksocket.c

gtk是linux一款强大的夸平台的图形化开发工具

/* GTK - The GIMP Toolkit
 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* By Owen Taylor <[e-mail]>              98/4/4 */

/*
 * Modified by the GTK+ Team and others 1997-1999.  See the AUTHORS
 * file for a list of people on the GTK+ Team.  See the ChangeLog
 * files for a list of changes.  These files are distributed with
 * GTK+ at ftp://ftp.gtk.org/pub/gtk/. 
 */

#include "gdk/gdkx.h"
#include "gdk/gdkkeysyms.h"
#include "gtkwindow.h"
#include "gtksignal.h"
#include "gtksocket.h"
#include "gtkdnd.h"

/* Forward declararations */

static void gtk_socket_class_init               (GtkSocketClass    *klass);
static void gtk_socket_init                     (GtkSocket         *socket);
static void gtk_socket_realize                  (GtkWidget        *widget);
static void gtk_socket_unrealize                (GtkWidget        *widget);
static void gtk_socket_size_request             (GtkWidget      *widget,
					       GtkRequisition *requisition);
static void gtk_socket_size_allocate            (GtkWidget     *widget,
					       GtkAllocation *allocation);
static gint gtk_socket_focus_in_event           (GtkWidget *widget, 
						 GdkEventFocus *event);
static void gtk_socket_claim_focus              (GtkSocket *socket);
static gint gtk_socket_focus_out_event          (GtkWidget *widget, 
						 GdkEventFocus *event);
static void gtk_socket_send_configure_event     (GtkSocket *socket);
static gint gtk_socket_focus                    (GtkContainer *container, 
						 GtkDirectionType direction);
static GdkFilterReturn gtk_socket_filter_func   (GdkXEvent *gdk_xevent, 
						 GdkEvent *event, 
						 gpointer data);

/* From Tk */
#define EMBEDDED_APP_WANTS_FOCUS NotifyNormal+20

/* Local data */

static GtkWidgetClass *parent_class = NULL;

guint
gtk_socket_get_type ()
{
  static guint socket_type = 0;

  if (!socket_type)
    {
      static const GtkTypeInfo socket_info =
      {
	"GtkSocket",
	sizeof (GtkSocket),
	sizeof (GtkSocketClass),
	(GtkClassInitFunc) gtk_socket_class_init,
	(GtkObjectInitFunc) gtk_socket_init,
	(GtkArgSetFunc) NULL,
	(GtkArgGetFunc) NULL
      };

      socket_type = gtk_type_unique (gtk_container_get_type (), &socket_info);
    }

  return socket_type;
}

static void
gtk_socket_class_init (GtkSocketClass *class)
{
  GtkObjectClass *object_class;
  GtkWidgetClass *widget_class;
  GtkContainerClass *container_class;

  object_class = (GtkObjectClass*) class;
  widget_class = (GtkWidgetClass*) class;
  container_class = (GtkContainerClass*) class;

  parent_class = gtk_type_class (gtk_widget_get_type ());

  widget_class->realize = gtk_socket_realize;
  widget_class->unrealize = gtk_socket_unrealize;
  widget_class->size_request = gtk_socket_size_request;
  widget_class->size_allocate = gtk_socket_size_allocate;
  widget_class->focus_in_event = gtk_socket_focus_in_event;
  widget_class->focus_out_event = gtk_socket_focus_out_event;

  container_class->focus = gtk_socket_focus;
}

static void
gtk_socket_init (GtkSocket *socket)
{
  socket->request_width = 0;
  socket->request_height = 0;
  socket->current_width = 0;
  socket->current_height = 0;
  
  socket->plug_window = NULL;
  socket->same_app = FALSE;
  socket->focus_in = FALSE;
  socket->have_size = FALSE;
  socket->need_map = FALSE;
}

GtkWidget*
gtk_socket_new ()
{
  GtkSocket *socket;

  socket = gtk_type_new (gtk_socket_get_type ());

  return GTK_WIDGET (socket);
}

void           
gtk_socket_steal (GtkSocket *socket, guint32 id)
{
  GtkWidget *widget;

  widget = GTK_WIDGET (socket);
  
  socket->plug_window = gdk_window_lookup (id);

  gdk_error_trap_push ();
  
  if (socket->plug_window && socket->plug_window->user_data)
    {
      /*
	GtkWidget *child_widget;

	child_widget = GTK_WIDGET (socket->plug_window->user_data);
      */

      g_warning("Stealing from same app not yet implemented");
      
      socket->same_app = TRUE;
    }
  else
    {
      socket->plug_window = gdk_window_foreign_new (id);
      if (!socket->plug_window) /* was deleted before we could get it */
	{
	  gdk_error_trap_pop ();
	  return;
	}
	
      socket->same_app = FALSE;
      socket->have_size = FALSE;

      XSelectInput (GDK_DISPLAY (),
		    GDK_WINDOW_XWINDOW(socket->plug_window),
		    StructureNotifyMask | PropertyChangeMask);

      gtk_widget_queue_resize (widget);
    }

  gdk_window_hide (socket->plug_window);
  gdk_window_reparent (socket->plug_window, widget->window, 0, 0);

  gdk_flush ();
  gdk_error_trap_pop ();
  
  socket->need_map = TRUE;
}

static void
gtk_socket_realize (GtkWidget *widget)
{
  GtkSocket *socket;
  GdkWindowAttr attributes;
  gint attributes_mask;
  XWindowAttributes xattrs;

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

  socket = GTK_SOCKET (widget);
  GTK_WIDGET_SET_FLAGS (widget, 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_FOCUS_CHANGE_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, socket);

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

  XGetWindowAttributes (GDK_DISPLAY (),
			GDK_WINDOW_XWINDOW (widget->window),
			&xattrs);

  XSelectInput (GDK_DISPLAY (),
		GDK_WINDOW_XWINDOW(widget->window), 
		xattrs.your_event_mask | 
		SubstructureNotifyMask | SubstructureRedirectMask);

  gdk_window_add_filter (widget->window, gtk_socket_filter_func, widget);

  GTK_WIDGET_SET_FLAGS (widget, GTK_REALIZED);

  /* We sync here so that we make sure that if the XID for
   * our window is passed to another application, SubstructureRedirectMask
   * will be set by the time the other app creates its window.
   */
  gdk_flush();
}

static void
gtk_socket_unrealize (GtkWidget *widget)
{
  GtkSocket *socket;

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

  socket = GTK_SOCKET (widget);

  if (socket->plug_window)
    {
      GtkWidget *toplevel = gtk_widget_get_toplevel (GTK_WIDGET (socket));
      if (toplevel && GTK_IS_WINDOW (toplevel))
	gtk_window_remove_embedded_xid (GTK_WINDOW (toplevel), 
					GDK_WINDOW_XWINDOW (socket->plug_window));
    }

  if (GTK_WIDGET_CLASS (parent_class)->unrealize)
    (* GTK_WIDGET_CLASS (parent_class)->unrealize) (widget);
}
  
static void 
gtk_socket_size_request (GtkWidget      *widget,
			 GtkRequisition *requisition)
{
  GtkSocket *socket;

  g_return_if_fail (widget != NULL);
  g_return_if_fail (GTK_IS_SOCKET (widget));
  g_return_if_fail (requisition != NULL);
  
  socket = GTK_SOCKET (widget);

  if (!socket->have_size && socket->plug_window)
    {
      XSizeHints hints;
      long supplied;

      gdk_error_trap_push ();
      
      if (XGetWMNormalHints (GDK_DISPLAY(),
			     GDK_WINDOW_XWINDOW (socket->plug_window),
			     &hints, &supplied))
	{
	  /* This is obsolete, according the X docs, but many programs
	   * still use it */
	  if (hints.flags & (PSize | USSize))
	    {
	      socket->request_width = hints.width;
	      socket->request_height = hints.height;
	    }
	  else if (hints.flags & PMinSize)
	    {
	      socket->request_width = hints.min_width;
	      socket->request_height = hints.min_height;
	    }
	  else if (hints.flags & PBaseSize)
	    {
	      socket->request_width = hints.base_width;
	      socket->request_height = hints.base_height;
	    }
	}
      socket->have_size = TRUE;	/* don't check again? */

      gdk_error_trap_pop ();
    }

  requisition->width = MAX (socket->request_width, 1);
  requisition->height = MAX (socket->request_height, 1);
}

static void
gtk_socket_size_allocate (GtkWidget     *widget,
			  GtkAllocation *allocation)
{
  GtkSocket *socket;

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

  socket = GTK_SOCKET (widget);

  widget->allocation = *allocation;
  if (GTK_WIDGET_REALIZED (widget))
    {
      gdk_window_move_resize (widget->window,
			      allocation->x, allocation->y,
			      allocation->width, allocation->height);

      if (socket->plug_window)
	{
	  gdk_error_trap_push ();
	  
	  if (!socket->need_map &&
	      (allocation->width == socket->current_width) &&
	      (allocation->height == socket->current_height))
	    {
	      gtk_socket_send_configure_event (socket);
	      GTK_NOTE(PLUGSOCKET, 
		       g_message ("GtkSocket - allocated no change: %d %d",
				  allocation->width, allocation->height));
	    }
	  else
	    {
	      gdk_window_move_resize (socket->plug_window,
				      0, 0,
				      allocation->width, allocation->height);
	      GTK_NOTE(PLUGSOCKET,
		       g_message ("GtkSocket - allocated: %d %d",
				  allocation->width, allocation->height));
	      socket->current_width = allocation->width;
	      socket->current_height = allocation->height;
	    }

	  if (socket->need_map)
	    {
	      gdk_window_show (socket->plug_window);
	      socket->need_map = FALSE;
	    }

	  gdk_flush ();
	  gdk_error_trap_pop ();
	}
    }
}

static gint
gtk_socket_focus_in_event (GtkWidget *widget, GdkEventFocus *event)
{
  GtkSocket *socket;
  g_return_val_if_fail (GTK_IS_SOCKET (widget), FALSE);
  socket = GTK_SOCKET (widget);