gdkdnd-x11.c

linux下电话本所依赖的一些图形库

/* GDK - The GIMP Drawing Kit
 * Copyright (C) 1995-1999 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 Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 * Modified by the GTK+ Team and others 1997-2000.  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 <config.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <string.h>

#include "gdk.h"          /* For gdk_flush() */
#include "gdkx.h"
#include "gdkasync.h"
#include "gdkdnd.h"
#include "gdkproperty.h"
#include "gdkprivate-x11.h"
#include "gdkinternals.h"
#include "gdkscreen-x11.h"
#include "gdkdisplay-x11.h"
#include "gdkalias.h"

typedef struct _GdkDragContextPrivateX11 GdkDragContextPrivateX11;

typedef enum {
  GDK_DRAG_STATUS_DRAG,
  GDK_DRAG_STATUS_MOTION_WAIT,
  GDK_DRAG_STATUS_ACTION_WAIT,
  GDK_DRAG_STATUS_DROP
} GtkDragStatus;

typedef struct {
  guint32 xid;
  gint x, y, width, height;
  gboolean mapped;
} GdkCacheChild;

typedef struct {
  GList *children;
  GHashTable *child_hash;
  guint old_event_mask;
  GdkScreen *screen;
} GdkWindowCache;

/* Structure that holds information about a drag in progress.
 * this is used on both source and destination sides.
 */
struct _GdkDragContextPrivateX11 {
  GdkDragContext context;

  Atom motif_selection;
  guint   ref_count;

  guint16 last_x;		/* Coordinates from last event */
  guint16 last_y;
  GdkDragAction old_action;	  /* The last action we sent to the source */
  GdkDragAction old_actions;	  /* The last actions we sent to the source */
  GdkDragAction xdnd_actions;     /* What is currently set in XdndActionList */

  Window dest_xid;              /* The last window we looked up */
  Window drop_xid;            /* The (non-proxied) window that is receiving drops */
  guint xdnd_targets_set : 1;   /* Whether we've already set XdndTypeList */
  guint xdnd_actions_set : 1;   /* Whether we've already set XdndActionList */
  guint xdnd_have_actions : 1;  /* Whether an XdndActionList was provided */
  guint motif_targets_set : 1;  /* Whether we've already set motif initiator info */
  guint drag_status : 4;	/* current status of drag */
  
  guint drop_failed : 1;        /* Whether the drop was unsuccessful */
  guint version;                /* Xdnd protocol version */

  GSList *window_caches;
};

#define PRIVATE_DATA(context) ((GdkDragContextPrivateX11 *) GDK_DRAG_CONTEXT (context)->windowing_data)

/* Forward declarations */

static void gdk_window_cache_destroy (GdkWindowCache *cache);

static void motif_read_target_table (GdkDisplay *display);

static GdkFilterReturn motif_dnd_filter (GdkXEvent *xev,
					 GdkEvent  *event,
					 gpointer   data);

static GdkFilterReturn xdnd_enter_filter    (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_leave_filter    (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_position_filter (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_status_filter   (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_finished_filter (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);
static GdkFilterReturn xdnd_drop_filter     (GdkXEvent *xev,
					     GdkEvent  *event,
					     gpointer   data);

static void   xdnd_manage_source_filter (GdkDragContext *context,
					 GdkWindow      *window,
					 gboolean        add_filter);

static void gdk_drag_context_init       (GdkDragContext      *dragcontext);
static void gdk_drag_context_class_init (GdkDragContextClass *klass);
static void gdk_drag_context_finalize   (GObject              *object);

static gpointer parent_class = NULL;
static GList *contexts;

const static struct {
  const char *atom_name;
  GdkFilterFunc func;
} xdnd_filters[] = {
  { "XdndEnter",    xdnd_enter_filter },
  { "XdndLeave",    xdnd_leave_filter },
  { "XdndPosition", xdnd_position_filter },
  { "XdndStatus",   xdnd_status_filter },
  { "XdndFinished", xdnd_finished_filter },
  { "XdndDrop",     xdnd_drop_filter },
};
	      
GType
gdk_drag_context_get_type (void)
{
  static GType object_type = 0;

  if (!object_type)
    {
      static const GTypeInfo object_info =
      {
        sizeof (GdkDragContextClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) gdk_drag_context_class_init,
        NULL,           /* class_finalize */
        NULL,           /* class_data */
        sizeof (GdkDragContext),
        0,              /* n_preallocs */
        (GInstanceInitFunc) gdk_drag_context_init,
      };
      
      object_type = g_type_register_static (G_TYPE_OBJECT,
                                            "GdkDragContext",
                                            &object_info, 0);
    }
  
  return object_type;
}

static void
gdk_drag_context_init (GdkDragContext *dragcontext)
{
  GdkDragContextPrivateX11 *private;

  private = g_new0 (GdkDragContextPrivateX11, 1);

  dragcontext->windowing_data = private;

  contexts = g_list_prepend (contexts, dragcontext);
}

static void
gdk_drag_context_class_init (GdkDragContextClass *klass)
{
  GObjectClass *object_class = G_OBJECT_CLASS (klass);

  parent_class = g_type_class_peek_parent (klass);

  object_class->finalize = gdk_drag_context_finalize;
}

static void
gdk_drag_context_finalize (GObject *object)
{
  GdkDragContext *context = GDK_DRAG_CONTEXT (object);
  GdkDragContextPrivateX11 *private = PRIVATE_DATA (context);
  GSList *tmp_list;
  
  g_list_free (context->targets);

  if (context->source_window)
    {
      if ((context->protocol == GDK_DRAG_PROTO_XDND) &&
          !context->is_source)
        xdnd_manage_source_filter (context, context->source_window, FALSE);
      
      g_object_unref (context->source_window);
    }
  
  if (context->dest_window)
    g_object_unref (context->dest_window);

  for (tmp_list = private->window_caches; tmp_list; tmp_list = tmp_list->next)
    gdk_window_cache_destroy (tmp_list->data);
  g_slist_free (private->window_caches);
  
  contexts = g_list_remove (contexts, context);

  g_free (private);
  
  G_OBJECT_CLASS (parent_class)->finalize (object);
}

/* Drag Contexts */

/**
 * gdk_drag_context_new:
 * 
 * Creates a new #GdkDragContext.
 * 
 * Return value: the newly created #GdkDragContext.
 **/
GdkDragContext *
gdk_drag_context_new        (void)
{
  return g_object_new (gdk_drag_context_get_type (), NULL);
}

/**
 * gdk_drag_context_ref:
 * @context: a #GdkDragContext.
 * 
 * Deprecated function; use g_object_ref() instead.
 **/
void            
gdk_drag_context_ref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));

  g_object_ref (context);
}

/**
 * gdk_drag_context_unref:
 * @context: a #GdkDragContext.
 * 
 * Deprecated function; use g_object_unref() instead.
 **/
void            
gdk_drag_context_unref (GdkDragContext *context)
{
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));

  g_object_unref (context);
}

static GdkDragContext *
gdk_drag_context_find (GdkDisplay *display,
		       gboolean    is_source,
		       Window      source_xid,
		       Window      dest_xid)
{
  GList *tmp_list = contexts;
  GdkDragContext *context;
  GdkDragContextPrivateX11 *private;
  Window context_dest_xid;

  while (tmp_list)
    {
      context = (GdkDragContext *)tmp_list->data;
      private = PRIVATE_DATA (context);

      if ((context->source_window && gdk_drawable_get_display (context->source_window) != display) ||
	  (context->dest_window && gdk_drawable_get_display (context->dest_window) != display))
	continue;

      context_dest_xid = context->dest_window ? 
                            (private->drop_xid ?
                              private->drop_xid :
                              GDK_DRAWABLE_XID (context->dest_window)) :
	                     None;

      if ((!context->is_source == !is_source) &&
	  ((source_xid == None) || (context->source_window &&
	    (GDK_DRAWABLE_XID (context->source_window) == source_xid))) &&
	  ((dest_xid == None) || (context_dest_xid == dest_xid)))
	return context;
      
      tmp_list = tmp_list->next;
    }
  
  return NULL;
}

static void
precache_target_list (GdkDragContext *context)
{
  if (context->targets)
    {
      GPtrArray *targets = g_ptr_array_new ();
      GList *tmp_list;
      int i;

      for (tmp_list = context->targets; tmp_list; tmp_list = tmp_list->next)
	g_ptr_array_add (targets, gdk_atom_name (GDK_POINTER_TO_ATOM (tmp_list->data)));

      _gdk_x11_precache_atoms (GDK_WINDOW_DISPLAY (context->source_window),
			       (const gchar **)targets->pdata,
			       targets->len);

      for (i =0; i < targets->len; i++)
	g_free (targets->pdata[i]);

      g_ptr_array_free (targets, TRUE);
    }
}

/* Utility functions */

static void
gdk_window_cache_add (GdkWindowCache *cache,
		      guint32 xid,
		      gint x, gint y, gint width, gint height, 
		      gboolean mapped)
{
  GdkCacheChild *child = g_new (GdkCacheChild, 1);

  child->xid = xid;
  child->x = x;
  child->y = y;
  child->width = width;
  child->height = height;
  child->mapped = mapped;

  cache->children = g_list_prepend (cache->children, child);
  g_hash_table_insert (cache->child_hash, GUINT_TO_POINTER (xid), 
		       cache->children);
}

static GdkFilterReturn
gdk_window_cache_filter (GdkXEvent *xev,
			 GdkEvent  *event,
			 gpointer   data)
{
  XEvent *xevent = (XEvent *)xev;
  GdkWindowCache *cache = data;

  switch (xevent->type)
    {
    case CirculateNotify:
      break;
    case ConfigureNotify:
      {
	XConfigureEvent *xce = &xevent->xconfigure;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xce->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->x = xce->x; 
	    child->y = xce->y;
	    child->width = xce->width; 
	    child->height = xce->height;
	    if (xce->above == None && (node->next))
	      {
		GList *last = g_list_last (cache->children);
		cache->children = g_list_remove_link (cache->children, node);
		last->next = node;
		node->next = NULL;
		node->prev = last;
	      }
	    else
	      {
		GList *above_node = g_hash_table_lookup (cache->child_hash, 
							 GUINT_TO_POINTER (xce->above));
		if (above_node && node->next != above_node)
		  {
		    /* Put the window above (before in the list) above_node
		     */
		    cache->children = g_list_remove_link (cache->children, node);
		    node->prev = above_node->prev;
		    if (node->prev)
		      node->prev->next = node;
		    else
		      cache->children = node;
		    node->next = above_node;
		    above_node->prev = node;
		  }
	      }
	  }
	break;
      }
    case CreateNotify:
      {
	XCreateWindowEvent *xcwe = &xevent->xcreatewindow;

	if (!g_hash_table_lookup (cache->child_hash, 
				  GUINT_TO_POINTER (xcwe->window))) 
	  gdk_window_cache_add (cache, xcwe->window, 
				xcwe->x, xcwe->y, xcwe->width, xcwe->height,
				FALSE);
	break;
      }
    case DestroyNotify:
      {
	XDestroyWindowEvent *xdwe = &xevent->xdestroywindow;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xdwe->window));
	if (node) 
	  {
	    g_hash_table_remove (cache->child_hash,
				 GUINT_TO_POINTER (xdwe->window));
	    cache->children = g_list_remove_link (cache->children, node);
	    g_free (node->data);
	    g_list_free_1 (node);
	  }
	break;
      }
    case MapNotify:
      {
	XMapEvent *xme = &xevent->xmap;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xme->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->mapped = TRUE;
	  }
	break;
      }
    case ReparentNotify:
      break;
    case UnmapNotify:
      {
	XMapEvent *xume = &xevent->xmap;
	GList *node;

	node = g_hash_table_lookup (cache->child_hash, 
				    GUINT_TO_POINTER (xume->window));
	if (node) 
	  {
	    GdkCacheChild *child = node->data;
	    child->mapped = FALSE;
	  }
	break;
      }
    default:
      return GDK_FILTER_CONTINUE;
    }
  return GDK_FILTER_REMOVE;