gdkdnd-fb.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 "gdk.h"          /* For gdk_flush() */
#include "gdkdnd.h"
#include "gdkproperty.h"
#include "gdkinternals.h"
#include "gdkprivate-fb.h"

typedef struct _GdkDragContextPrivate GdkDragContextPrivate;

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

/* Structure that holds information about a drag in progress.
 * this is used on both source and destination sides.
 */
struct _GdkDragContextPrivate {
  GdkAtom local_selection;
  
  guint16 last_x;		/* Coordinates from last event */
  guint16 last_y;
  
  guint drag_status : 4;	/* current status of drag */
};

/* Drag Contexts */

static GList *contexts;
static gpointer parent_class = NULL;

#define GDK_DRAG_CONTEXT_PRIVATE_DATA(ctx) ((GdkDragContextPrivate *) GDK_DRAG_CONTEXT (ctx)->windowing_data)

GdkDragContext *current_dest_drag = NULL;

static void
gdk_drag_context_init (GdkDragContext *dragcontext)
{
  dragcontext->windowing_data = g_new0 (GdkDragContextPrivate, 1);

  contexts = g_list_prepend (contexts, dragcontext);
}

static void
gdk_drag_context_finalize (GObject *object)
{
  GdkDragContext *context = GDK_DRAG_CONTEXT (object);
  GdkDragContextPrivate *private = GDK_DRAG_CONTEXT_PRIVATE_DATA (object);
  
  g_list_free (context->targets);

  if (context->source_window)
    gdk_window_unref (context->source_window);
  
  if (context->dest_window)
    gdk_window_unref (context->dest_window);

  
  if (private)
    {
      g_free (private);
      context->windowing_data = NULL;
    }
  
  contexts = g_list_remove (contexts, context);

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

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;
}


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;
}

GdkDragContext *
gdk_drag_context_new        (void)
{
  return (GdkDragContext *)g_object_new (gdk_drag_context_get_type (), NULL);
}

void            
gdk_drag_context_ref (GdkDragContext *context)
{
  g_object_ref (context);
}

void            
gdk_drag_context_unref (GdkDragContext *context)
{
  g_object_unref (context);
}

static GdkDragContext *
gdk_drag_context_find (gboolean     is_source,
		       GdkWindow   *source,
		       GdkWindow   *dest)
{
  GList *tmp_list = contexts;
  
  GdkDragContext *context;
  GdkDragContextPrivate *private;

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

      if ((!context->is_source == !is_source) &&
	  ((source == NULL) || (context->source_window && (context->source_window == source))) &&
	  ((dest == NULL) || (context->dest_window && (context->dest_window == dest))))
	  return context;
      
      tmp_list = tmp_list->next;
    }
  
  return NULL;
}


/*************************************************************
 ************************** Public API ***********************
 *************************************************************/

void
_gdk_dnd_init (void)
{
}

/* Source side */

static void
local_send_leave (GdkDragContext  *context,
		  guint32          time)
{
  GdkEvent tmp_event;
  
  if ((current_dest_drag != NULL) &&
      (current_dest_drag->protocol == GDK_DRAG_PROTO_LOCAL) &&
      (current_dest_drag->source_window == context->source_window))
    {
      tmp_event.dnd.type = GDK_DRAG_LEAVE;
      tmp_event.dnd.window = context->dest_window;
      /* Pass ownership of context to the event */
      tmp_event.dnd.context = current_dest_drag;
      tmp_event.dnd.send_event = FALSE;
      tmp_event.dnd.time = GDK_CURRENT_TIME; /* FIXME? */

      current_dest_drag = NULL;
      
      gdk_event_put (&tmp_event);
    }
  
}

static void
local_send_enter (GdkDragContext  *context,
		  guint32          time)
{
  GdkEvent tmp_event;
  GdkDragContextPrivate *private;
  GdkDragContext *new_context;

  private = GDK_DRAG_CONTEXT_PRIVATE_DATA (context);
  
  if (!private->local_selection)
    private->local_selection = gdk_atom_intern ("LocalDndSelection", FALSE);

  if (current_dest_drag != NULL)
    {
      gdk_drag_context_unref (current_dest_drag);
      current_dest_drag = NULL;
    }

  new_context = gdk_drag_context_new ();
  new_context->protocol = GDK_DRAG_PROTO_LOCAL;
  new_context->is_source = FALSE;

  new_context->source_window = context->source_window;
  gdk_window_ref (new_context->source_window);
  new_context->dest_window = context->dest_window;
  gdk_window_ref (new_context->dest_window);

  new_context->targets = g_list_copy (context->targets);

  gdk_window_set_events (new_context->source_window,
			 gdk_window_get_events (new_context->source_window) |
			 GDK_PROPERTY_CHANGE_MASK);
 new_context->actions = context->actions;

  tmp_event.dnd.type = GDK_DRAG_ENTER;
  tmp_event.dnd.window = context->dest_window;
  tmp_event.dnd.send_event = FALSE;
  tmp_event.dnd.context = new_context;
  gdk_drag_context_ref (new_context);

  tmp_event.dnd.time = GDK_CURRENT_TIME; /* FIXME? */
  
  current_dest_drag = new_context;
  
  (GDK_DRAG_CONTEXT_PRIVATE_DATA (new_context))->local_selection = 
    private->local_selection;

  gdk_event_put (&tmp_event);
}

static void
local_send_motion (GdkDragContext  *context,
		    gint            x_root, 
		    gint            y_root,
		    GdkDragAction   action,
		    guint32         time)
{
  GdkEvent tmp_event;
  
  if ((current_dest_drag != NULL) &&
      (current_dest_drag->protocol == GDK_DRAG_PROTO_LOCAL) &&
      (current_dest_drag->source_window == context->source_window))
    {
      tmp_event.dnd.type = GDK_DRAG_MOTION;
      tmp_event.dnd.window = current_dest_drag->dest_window;
      tmp_event.dnd.send_event = FALSE;
      tmp_event.dnd.context = current_dest_drag;
      gdk_drag_context_ref (current_dest_drag);

      tmp_event.dnd.time = time;

      current_dest_drag->suggested_action = action;
      current_dest_drag->actions = current_dest_drag->suggested_action;

      tmp_event.dnd.x_root = x_root;
      tmp_event.dnd.y_root = y_root;

      (GDK_DRAG_CONTEXT_PRIVATE_DATA (current_dest_drag))->last_x = x_root;
      (GDK_DRAG_CONTEXT_PRIVATE_DATA (current_dest_drag))->last_y = y_root;

      GDK_DRAG_CONTEXT_PRIVATE_DATA (context)->drag_status = GDK_DRAG_STATUS_MOTION_WAIT;
      
      gdk_event_put (&tmp_event);
    }
}

static void
local_send_drop (GdkDragContext *context, guint32 time)
{
  GdkEvent tmp_event;
  
  if ((current_dest_drag != NULL) &&
      (current_dest_drag->protocol == GDK_DRAG_PROTO_LOCAL) &&
      (current_dest_drag->source_window == context->source_window))
    {
      GdkDragContextPrivate *private;
      private = GDK_DRAG_CONTEXT_PRIVATE_DATA (current_dest_drag);

      tmp_event.dnd.type = GDK_DROP_START;
      tmp_event.dnd.window = current_dest_drag->dest_window;
      tmp_event.dnd.send_event = FALSE;

      tmp_event.dnd.context = current_dest_drag;
      gdk_drag_context_ref (current_dest_drag);

      tmp_event.dnd.time = GDK_CURRENT_TIME;
      
      tmp_event.dnd.x_root = private->last_x;
      tmp_event.dnd.y_root = private->last_y;
      
      gdk_event_put (&tmp_event);
    }

}

static void
gdk_drag_do_leave (GdkDragContext *context, guint32 time)
{
  if (context->dest_window)
    {
      switch (context->protocol)
	{
	case GDK_DRAG_PROTO_LOCAL:
	  local_send_leave (context, time);
	  break;
	default:
	  break;
	}

      gdk_window_unref (context->dest_window);
      context->dest_window = NULL;
    }
}

GdkDragContext * 
gdk_drag_begin (GdkWindow     *window,
		GList         *targets)
{
  GList *tmp_list;
  GdkDragContext *new_context;

  g_return_val_if_fail (window != NULL, NULL);

  new_context = gdk_drag_context_new ();
  new_context->is_source = TRUE;
  new_context->source_window = window;