gtkdnd.c 99.7 KB
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/* GTK - The GIMP Toolkit
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 * Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
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 *
 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * 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
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

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/*
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 * Modified by the GTK+ Team and others 1997-2000.  See the AUTHORS
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 * 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/. 
 */

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#include <config.h>
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#include "gtkalias.h"
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#include "gdkconfig.h"

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#include "gdk/gdkkeysyms.h"
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#include "gtkdnd.h"
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#include "gtkimage.h"
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#include "gtkinvisible.h"
#include "gtkmain.h"
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#include "gtkplug.h"
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#include "gtkstock.h"
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#include "gtkwindow.h"
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static GSList *source_widgets = NULL;
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typedef struct _GtkDragSourceSite GtkDragSourceSite;
typedef struct _GtkDragSourceInfo GtkDragSourceInfo;
typedef struct _GtkDragDestSite GtkDragDestSite;
typedef struct _GtkDragDestInfo GtkDragDestInfo;
typedef struct _GtkDragAnim GtkDragAnim;
typedef struct _GtkDragFindData GtkDragFindData;


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typedef enum 
{
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  GTK_DRAG_STATUS_DRAG,
  GTK_DRAG_STATUS_WAIT,
  GTK_DRAG_STATUS_DROP
} GtkDragStatus;

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struct _GtkDragSourceSite 
{
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  GdkModifierType    start_button_mask;
  GtkTargetList     *target_list;        /* Targets for drag data */
  GdkDragAction      actions;            /* Possible actions */
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  /* Drag icon */
  GtkImageType icon_type;
  union
  {
    GtkImagePixmapData pixmap;
    GtkImagePixbufData pixbuf;
    GtkImageStockData stock;
  } icon_data;
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  GdkBitmap *icon_mask;
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  GdkColormap       *colormap;	         /* Colormap for drag icon */
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  /* Stored button press information to detect drag beginning */
  gint               state;
  gint               x, y;
};
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struct _GtkDragSourceInfo 
{
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  GtkWidget         *widget;
  GtkTargetList     *target_list; /* Targets for drag data */
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  GdkDragAction      possible_actions; /* Actions allowed by source */
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  GdkDragContext    *context;	  /* drag context */
  GtkWidget         *icon_window; /* Window for drag */
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  GtkWidget         *fallback_icon; /* Window for drag used on other screens */
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  GtkWidget         *ipc_widget;  /* GtkInvisible for grab, message passing */
  GdkCursor         *cursor;	  /* Cursor for drag */
  gint hot_x, hot_y;		  /* Hot spot for drag */
  gint button;			  /* mouse button starting drag */
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  GtkDragStatus      status;	  /* drag status */
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  GdkEvent          *last_event;  /* pending event */
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  gint               start_x, start_y; /* Initial position */
  gint               cur_x, cur_y;     /* Current Position */
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  GdkScreen         *cur_screen;       /* Current screen for pointer */
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  guint32            grab_time;   /* timestamp for initial grab */
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  GList             *selections;  /* selections we've claimed */
  
  GtkDragDestInfo   *proxy_dest;  /* Set if this is a proxy drag */
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  guint              update_idle;      /* Idle function to update the drag */
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  guint              drop_timeout;     /* Timeout for aborting drop */
  guint              destroy_icon : 1; /* If true, destroy icon_window
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      				        */
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  guint              have_grab : 1;    /* Do we still have the pointer grab
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					 */
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};

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struct _GtkDragDestSite 
{
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  GtkDestDefaults    flags;
  GtkTargetList     *target_list;
  GdkDragAction      actions;
  GdkWindow         *proxy_window;
  GdkDragProtocol    proxy_protocol;
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  guint              do_proxy : 1;
  guint              proxy_coords : 1;
  guint              have_drag : 1;
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};
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struct _GtkDragDestInfo 
{
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  GtkWidget         *widget;	   /* Widget in which drag is in */
  GdkDragContext    *context;	   /* Drag context */
  GtkDragSourceInfo *proxy_source; /* Set if this is a proxy drag */
  GtkSelectionData  *proxy_data;   /* Set while retrieving proxied data */
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  guint              dropped : 1;     /* Set after we receive a drop */
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  guint32            proxy_drop_time; /* Timestamp for proxied drop */
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  guint              proxy_drop_wait : 1; /* Set if we are waiting for a
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					   * status reply before sending
					   * a proxied drop on.
					   */
  gint               drop_x, drop_y; /* Position of drop */
};

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#define DROP_ABORT_TIME 300000
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#define ANIM_STEP_TIME 50
#define ANIM_STEP_LENGTH 50
#define ANIM_MIN_STEPS 5
#define ANIM_MAX_STEPS 10

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struct _GtkDragAnim 
{
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  GtkDragSourceInfo *info;
  gint step;
  gint n_steps;
};

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struct _GtkDragFindData 
{
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  gint x;
  gint y;
  GdkDragContext *context;
  GtkDragDestInfo *info;
  gboolean found;
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  gboolean toplevel;
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  gboolean (*callback) (GtkWidget *widget, GdkDragContext *context,
			gint x, gint y, guint32 time);
  guint32 time;
};

/* Enumeration for some targets we handle internally */

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enum {
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  TARGET_MOTIF_SUCCESS = 0x40000000,
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  TARGET_MOTIF_FAILURE,
  TARGET_DELETE
};

/* Drag icons */

static GdkPixmap   *default_icon_pixmap = NULL;
static GdkPixmap   *default_icon_mask = NULL;
static GdkColormap *default_icon_colormap = NULL;
static gint         default_icon_hot_x;
static gint         default_icon_hot_y;

/* Forward declarations */
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static void          gtk_drag_get_event_actions (GdkEvent        *event, 
					         gint             button,
					         GdkDragAction    actions,
					         GdkDragAction   *suggested_action,
					         GdkDragAction   *possible_actions);
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static GdkCursor *   gtk_drag_get_cursor         (GdkDisplay     *display,
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						  GdkDragAction   action);
static GtkWidget    *gtk_drag_get_ipc_widget     (GdkScreen	 *screen);
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static void          gtk_drag_release_ipc_widget (GtkWidget      *widget);
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static gboolean      gtk_drag_highlight_expose   (GtkWidget      *widget,
					  	  GdkEventExpose *event,
						  gpointer        data);
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static void     gtk_drag_selection_received     (GtkWidget        *widget,
						 GtkSelectionData *selection_data,
						 guint32           time,
						 gpointer          data);
static void     gtk_drag_find_widget            (GtkWidget        *widget,
						 GtkDragFindData  *data);
static void     gtk_drag_proxy_begin            (GtkWidget        *widget,
						 GtkDragDestInfo  *dest_info,
						 guint32           time);
static void     gtk_drag_dest_realized          (GtkWidget        *widget);
static void     gtk_drag_dest_hierarchy_changed (GtkWidget        *widget,
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						 GtkWidget        *previous_toplevel);
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static void     gtk_drag_dest_site_destroy      (gpointer          data);
static void     gtk_drag_dest_leave             (GtkWidget        *widget,
						 GdkDragContext   *context,
						 guint             time);
static gboolean gtk_drag_dest_motion            (GtkWidget        *widget,
						 GdkDragContext   *context,
						 gint              x,
						 gint              y,
						 guint             time);
static gboolean gtk_drag_dest_drop              (GtkWidget        *widget,
						 GdkDragContext   *context,
						 gint              x,
						 gint              y,
						 guint             time);
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static GtkDragDestInfo *  gtk_drag_get_dest_info     (GdkDragContext *context,
						      gboolean        create);
static GtkDragSourceInfo *gtk_drag_get_source_info   (GdkDragContext *context,
						      gboolean        create);
static void               gtk_drag_clear_source_info (GdkDragContext *context);
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static void gtk_drag_source_check_selection    (GtkDragSourceInfo *info, 
					        GdkAtom            selection,
					        guint32            time);
static void gtk_drag_source_release_selections (GtkDragSourceInfo *info,
						guint32            time);
static void gtk_drag_drop                      (GtkDragSourceInfo *info,
						guint32            time);
static void gtk_drag_drop_finished             (GtkDragSourceInfo *info,
						gboolean           success,
						guint              time);
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static void gtk_drag_cancel                    (GtkDragSourceInfo *info,
						guint32            time);
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static gint gtk_drag_source_event_cb           (GtkWidget         *widget,
						GdkEvent          *event,
						gpointer           data);
static void gtk_drag_source_site_destroy       (gpointer           data);
static void gtk_drag_selection_get             (GtkWidget         *widget, 
						GtkSelectionData  *selection_data,
						guint              sel_info,
						guint32            time,
						gpointer           data);
static gint gtk_drag_anim_timeout              (gpointer           data);
static void gtk_drag_remove_icon               (GtkDragSourceInfo *info);
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static void gtk_drag_source_info_destroy       (GtkDragSourceInfo *info);
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static void gtk_drag_add_update_idle           (GtkDragSourceInfo *info);

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static void gtk_drag_update                    (GtkDragSourceInfo *info,
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						GdkScreen         *screen,
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						gint               x_root,
						gint               y_root,
						GdkEvent          *event);
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static gint gtk_drag_motion_cb                 (GtkWidget         *widget, 
					        GdkEventMotion    *event, 
					        gpointer           data);
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static gint gtk_drag_key_cb                    (GtkWidget         *widget, 
					        GdkEventKey       *event, 
					        gpointer           data);
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static gint gtk_drag_button_release_cb         (GtkWidget         *widget, 
					        GdkEventButton    *event, 
					        gpointer           data);
static gint gtk_drag_abort_timeout             (gpointer           data);

/************************
 * Cursor and Icon data *
 ************************/

#define action_ask_width 16
#define action_ask_height 16
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static const guchar action_ask_bits[] = {
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  0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x76, 0xf8, 0xb6, 0xf7, 
  0xd6, 0xec, 0x66, 0xdb, 0x66, 0xdb, 0x96, 0xec, 0x76, 0xf7, 0x76, 0xfb, 
  0xf6, 0xfc, 0x72, 0xfb, 0x7a, 0xfb, 0xf8, 0xfc, };

#define action_ask_mask_width 16
#define action_ask_mask_height 16
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static const guchar action_ask_mask_bits[] = {
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  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x8f, 0x07, 0xcf, 0x0f, 
  0xef, 0x1f, 0xff, 0x3c, 0xff, 0x3c, 0x6f, 0x1f, 0x8f, 0x0f, 0x8f, 0x07, 
  0x0f, 0x03, 0x8f, 0x07, 0x87, 0x07, 0x07, 0x03, };

#define action_copy_width 16
#define action_copy_height 16
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static const guchar action_copy_bits[] = {
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  0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x76, 0xfb, 0x76, 0xfb, 
  0x76, 0xfb, 0x06, 0x83, 0xf6, 0xbf, 0xf6, 0xbf, 0x06, 0x83, 0x76, 0xfb, 
  0x76, 0xfb, 0x72, 0xfb, 0x7a, 0xf8, 0xf8, 0xff, };

#define action_copy_mask_width 16
#define action_copy_mask_height 16
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static const guchar action_copy_mask_bits[] = {
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  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x8f, 0x07, 0x8f, 0x07, 
  0x8f, 0x07, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0xff, 0x7f, 0x8f, 0x07, 
  0x8f, 0x07, 0x8f, 0x07, 0x87, 0x07, 0x07, 0x00, };

#define action_move_width 16
#define action_move_height 16
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static const guchar action_move_bits[] = {
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  0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x96, 0xff, 0x26, 0xff, 
  0xc6, 0xf8, 0xd6, 0xe3, 0x96, 0x8f, 0xb6, 0xbf, 0x36, 0xc3, 0x76, 0xfb, 
  0x76, 0xfa, 0xf2, 0xfa, 0xfa, 0xf8, 0xf8, 0xff, };

#define action_move_mask_width 16
#define action_move_mask_height 16
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static const guchar action_move_mask_bits[] = {
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  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x6f, 0x00, 0xff, 0x00, 
  0xff, 0x07, 0xef, 0x1f, 0xef, 0x7f, 0xcf, 0x7f, 0xcf, 0x3f, 0x8f, 0x07, 
  0x8f, 0x07, 0x0f, 0x07, 0x07, 0x07, 0x07, 0x00, };

#define action_link_width 16
#define action_link_height 16
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static const guchar action_link_bits[] = {
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  0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0x36, 0xf8, 0xd6, 0xf7, 
  0x66, 0xec, 0xa6, 0xe8, 0x26, 0xdf, 0xe6, 0xbd, 0xd6, 0xa7, 0xb6, 0xa8, 
  0xb6, 0xb1, 0x72, 0xdf, 0xfa, 0xe0, 0xf8, 0xff, };

#define action_link_mask_width 16
#define action_link_mask_height 16
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static const guchar action_link_mask_bits[] = {
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  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0xcf, 0x07, 0xef, 0x0f, 
  0xff, 0x1f, 0x7f, 0x1f, 0xff, 0x3f, 0xff, 0x7f, 0xef, 0x7f, 0xcf, 0x77, 
  0xcf, 0x7f, 0x8f, 0x3f, 0x07, 0x1f, 0x07, 0x00, };

#define action_none_width 16
#define action_none_height 16
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static const guchar action_none_bits[] = {
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  0x00, 0x00, 0xfe, 0x7f, 0xfe, 0x1f, 0x06, 0xc0, 0xf6, 0xff, 0xf6, 0xff, 
  0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 0xf6, 0xff, 
  0xf6, 0xff, 0xf2, 0xff, 0xfa, 0xff, 0xf8, 0xff, };

#define action_none_mask_width 16
#define action_none_mask_height 16
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static const guchar action_none_mask_bits[] = {
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  0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3f, 0x0f, 0x00, 0x0f, 0x00, 
  0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 0x0f, 0x00, 
  0x0f, 0x00, 0x0f, 0x00, 0x07, 0x00, 0x07, 0x00, };

#define CURSOR_WIDTH 16
#define CURSOR_HEIGHT 16

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static struct {
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  GdkDragAction action;
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  const guchar *bits;
  const guchar *mask;
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  GdkCursor    *cursor;
} drag_cursors[] = {
  { GDK_ACTION_DEFAULT, 0 },
  { GDK_ACTION_ASK,   action_ask_bits,  action_ask_mask_bits,  NULL },
  { GDK_ACTION_COPY,  action_copy_bits, action_copy_mask_bits, NULL },
  { GDK_ACTION_MOVE,  action_move_bits, action_move_mask_bits, NULL },
  { GDK_ACTION_LINK,  action_link_bits, action_link_mask_bits, NULL },
  { 0              ,  action_none_bits, action_none_mask_bits, NULL },
};

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static const gint n_drag_cursors = sizeof (drag_cursors) / sizeof (drag_cursors[0]);
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/*********************
 * Utility functions *
 *********************/

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static void
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set_can_change_screen (GtkWidget *widget,
		       gboolean   can_change_screen)
{
  can_change_screen = can_change_screen != FALSE;
  
  g_object_set_data (G_OBJECT (widget), "gtk-dnd-can-change-screen",
		     GUINT_TO_POINTER (can_change_screen));
}

static gboolean
get_can_change_screen (GtkWidget *widget)
{
  return g_object_get_data (G_OBJECT (widget), "gtk-dnd-can-change-screen") != NULL;

}

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/*************************************************************
 * gtk_drag_get_ipc_widget:
 *     Return a invisible, off-screen, override-redirect
 *     widget for IPC.
 *   arguments:
 *     
 *   results:
 *************************************************************/

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static GtkWidget *
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gtk_drag_get_ipc_widget (GdkScreen *screen)
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{
  GtkWidget *result;
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  GSList *drag_widgets = g_object_get_data (G_OBJECT (screen), 
					    "gtk-dnd-ipc-widgets");
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  if (drag_widgets)
    {
      GSList *tmp = drag_widgets;
      result = drag_widgets->data;
      drag_widgets = drag_widgets->next;
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      g_object_set_data (G_OBJECT (screen),
			 "gtk-dnd-ipc-widgets",
			 drag_widgets);
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      g_slist_free_1 (tmp);
    }
  else
    {
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      result = gtk_invisible_new_for_screen (screen);
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      gtk_widget_show (result);
    }
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  return result;
}

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/***************************************************************
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 * gtk_drag_release_ipc_widget:
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 *     Releases widget retrieved with gtk_drag_get_ipc_widget ()
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 *   arguments:
 *     widget: the widget to release.
 *   results:
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 ***************************************************************/
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static void
gtk_drag_release_ipc_widget (GtkWidget *widget)
{
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  GdkScreen *screen = gtk_widget_get_screen (widget);
  GSList *drag_widgets = g_object_get_data (G_OBJECT (screen),
					    "gtk-dnd-ipc-widgets");
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  drag_widgets = g_slist_prepend (drag_widgets, widget);
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  g_object_set_data (G_OBJECT (screen),
		     "gtk-dnd-ipc-widgets",
		     drag_widgets);
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}

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static guint32
gtk_drag_get_event_time (GdkEvent *event)
{
  guint32 tm = GDK_CURRENT_TIME;
  
  if (event)
    switch (event->type)
      {
      case GDK_MOTION_NOTIFY:
	tm = event->motion.time; break;
      case GDK_BUTTON_PRESS:
      case GDK_2BUTTON_PRESS:
      case GDK_3BUTTON_PRESS:
      case GDK_BUTTON_RELEASE:
	tm = event->button.time; break;
      case GDK_KEY_PRESS:
      case GDK_KEY_RELEASE:
	tm = event->key.time; break;
      case GDK_ENTER_NOTIFY:
      case GDK_LEAVE_NOTIFY:
	tm = event->crossing.time; break;
      case GDK_PROPERTY_NOTIFY:
	tm = event->property.time; break;
      case GDK_SELECTION_CLEAR:
      case GDK_SELECTION_REQUEST:
      case GDK_SELECTION_NOTIFY:
	tm = event->selection.time; break;
      case GDK_PROXIMITY_IN:
      case GDK_PROXIMITY_OUT:
	tm = event->proximity.time; break;
      default:			/* use current time */
	break;
      }
  
  return tm;
}

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static void
gtk_drag_get_event_actions (GdkEvent *event, 
			    gint button, 
			    GdkDragAction  actions,
			    GdkDragAction *suggested_action,
			    GdkDragAction *possible_actions)
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{
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  *suggested_action = 0;
  *possible_actions = 0;
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  if (event)
    {
      GdkModifierType state = 0;
      
      switch (event->type)
	{
	case GDK_MOTION_NOTIFY:
	  state = event->motion.state;
	  break;
	case GDK_BUTTON_PRESS:
	case GDK_2BUTTON_PRESS:
	case GDK_3BUTTON_PRESS:
	case GDK_BUTTON_RELEASE:
	  state = event->button.state;
	  break;
	case GDK_KEY_PRESS:
	case GDK_KEY_RELEASE:
	  state = event->key.state;
	  break;
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	case GDK_ENTER_NOTIFY:
	case GDK_LEAVE_NOTIFY:
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	  state = event->crossing.state;
	  break;
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	default:
	  break;
	}
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      if ((button == 2 || button == 3) && (actions & GDK_ACTION_ASK))
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	{
	  *suggested_action = GDK_ACTION_ASK;
	  *possible_actions = actions;
	}
      else if (state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK))
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	{
	  if ((state & GDK_SHIFT_MASK) && (state & GDK_CONTROL_MASK))
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	    {
	      if (actions & GDK_ACTION_LINK)
		{
		  *suggested_action = GDK_ACTION_LINK;
		  *possible_actions = GDK_ACTION_LINK;
		}
	    }
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	  else if (state & GDK_CONTROL_MASK)
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	    {
	      if (actions & GDK_ACTION_COPY)
		{
		  *suggested_action = GDK_ACTION_COPY;
		  *possible_actions = GDK_ACTION_COPY;
		}
	      return;
	    }
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	  else
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	    {
	      if (actions & GDK_ACTION_MOVE)
		{
		  *suggested_action = GDK_ACTION_MOVE;
		  *possible_actions = GDK_ACTION_MOVE;
		}
	      return;
	    }
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	}
      else
	{
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	  *possible_actions = actions;
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	  if ((state & (GDK_MOD1_MASK)) && (actions & GDK_ACTION_ASK))
	    *suggested_action = GDK_ACTION_ASK;
	  else if (actions & GDK_ACTION_COPY)
	    *suggested_action =  GDK_ACTION_COPY;
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	  else if (actions & GDK_ACTION_MOVE)
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	    *suggested_action = GDK_ACTION_MOVE;
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	  else if (actions & GDK_ACTION_LINK)
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	    *suggested_action = GDK_ACTION_LINK;
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	}
    }
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  else
    {
      *possible_actions = actions;
      
      if (actions & GDK_ACTION_COPY)
	*suggested_action =  GDK_ACTION_COPY;
      else if (actions & GDK_ACTION_MOVE)
	*suggested_action = GDK_ACTION_MOVE;
      else if (actions & GDK_ACTION_LINK)
	*suggested_action = GDK_ACTION_LINK;
    }
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  return;
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}

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static GdkCursor *
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gtk_drag_get_cursor (GdkDisplay   *display,
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		     GdkDragAction action)
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{
  gint i;
  
  for (i = 0 ; i < n_drag_cursors - 1; i++)
    if (drag_cursors[i].action == action)
      break;
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  if (drag_cursors[i].cursor != NULL)
    {
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      if (display != gdk_cursor_get_display (drag_cursors[i].cursor))
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	{
	  gdk_cursor_unref (drag_cursors[i].cursor);
	  drag_cursors[i].cursor = NULL;
	}
    }
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  if (drag_cursors[i].cursor == NULL)
    {
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      GdkColor bg = { 0, 0xffff, 0xffff, 0xffff };
      GdkColor fg = { 0, 0x0000, 0x0000, 0x0000 };
      GdkScreen *screen = gdk_display_get_default_screen (display);
      GdkWindow *window = gdk_screen_get_root_window (screen);
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      GdkPixmap *pixmap = 
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	gdk_bitmap_create_from_data (window, (gchar *)drag_cursors[i].bits, CURSOR_WIDTH, CURSOR_HEIGHT);
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      GdkPixmap *mask = 
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	gdk_bitmap_create_from_data (window, (gchar *)drag_cursors[i].mask, CURSOR_WIDTH, CURSOR_HEIGHT);
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      drag_cursors[i].cursor = gdk_cursor_new_from_pixmap (pixmap, mask, &fg, &bg, 0, 0);
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      g_object_unref (pixmap);
      g_object_unref (mask);
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    }
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  return drag_cursors[i].cursor;
}

/********************
 * Destination side *
 ********************/

/*************************************************************
 * gtk_drag_get_data:
 *     Get the data for a drag or drop
 *   arguments:
 *     context - drag context
 *     target  - format to retrieve the data in.
 *     time    - timestamp of triggering event.
 *     
 *   results:
 *************************************************************/

void 
gtk_drag_get_data (GtkWidget      *widget,
		   GdkDragContext *context,
		   GdkAtom         target,
		   guint32         time)
{
  GtkWidget *selection_widget;
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  g_return_if_fail (GTK_IS_WIDGET (widget));
  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
  g_return_if_fail (!context->is_source);
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  selection_widget = gtk_drag_get_ipc_widget (gtk_widget_get_screen (widget));
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  g_object_ref (context);
  g_object_ref (widget);
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  g_signal_connect (selection_widget, "selection_received",
		    G_CALLBACK (gtk_drag_selection_received), widget);
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  g_object_set_data (G_OBJECT (selection_widget), "drag-context", context);
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  gtk_selection_convert (selection_widget,
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			 gdk_drag_get_selection (context),
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			 target,
			 time);
}

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/*************************************************************
 * gtk_drag_get_source_widget:
 *     Get the widget the was the source of this drag, if
 *     the drag originated from this application.
 *   arguments:
 *     context: The drag context for this drag
 *   results:
 *     The source widget, or NULL if the drag originated from
 *     a different application.
 *************************************************************/

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GtkWidget *
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gtk_drag_get_source_widget (GdkDragContext *context)
{
  GSList *tmp_list;
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  g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
  g_return_val_if_fail (!context->is_source, NULL);
  
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  tmp_list = source_widgets;
  while (tmp_list)
    {
      GtkWidget *ipc_widget = tmp_list->data;
      
      if (ipc_widget->window == context->source_window)
	{
	  GtkDragSourceInfo *info;
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	  info = g_object_get_data (G_OBJECT (ipc_widget), "gtk-info");
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	  return info ? info->widget : NULL;
	}
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      tmp_list = tmp_list->next;
    }
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  return NULL;
}

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/*************************************************************
 * gtk_drag_finish:
 *     Notify the drag source that the transfer of data
 *     is complete.
 *   arguments:
 *     context: The drag context for this drag
 *     success: Was the data successfully transferred?
 *     time:    The timestamp to use when notifying the destination.
 *   results:
 *************************************************************/

void 
gtk_drag_finish (GdkDragContext *context,
		 gboolean        success,
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		 gboolean        del,
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		 guint32         time)
{
  GdkAtom target = GDK_NONE;
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  g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
  g_return_if_fail (!context->is_source);
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  if (success && del)
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    {
      target = gdk_atom_intern ("DELETE", FALSE);
    }
  else if (context->protocol == GDK_DRAG_PROTO_MOTIF)
    {
      target = gdk_atom_intern (success ? 
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				  "XmTRANSFER_SUCCESS" : 
				  "XmTRANSFER_FAILURE",
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				FALSE);
    }
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  if (target != GDK_NONE)
    {
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      GtkWidget *selection_widget = gtk_drag_get_ipc_widget (gdk_drawable_get_screen (context->source_window));
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      g_object_ref (context);
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      g_object_set_data (G_OBJECT (selection_widget), "drag-context", context);
      g_signal_connect (selection_widget, "selection_received",
			G_CALLBACK (gtk_drag_selection_received),
			NULL);
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      gtk_selection_convert (selection_widget,
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			     gdk_drag_get_selection (context),
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			     target,
			     time);
    }
  
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  if (!(success && del))
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    gdk_drop_finish (context, success, time);
}

/*************************************************************
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 * gtk_drag_highlight_expose:
 *     Callback for expose_event for highlighted widgets.
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 *   arguments:
 *     widget:
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 *     event:
 *     data:
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 *   results:
 *************************************************************/

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static gboolean
gtk_drag_highlight_expose (GtkWidget      *widget,
			   GdkEventExpose *event,
			   gpointer        data)
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{
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  gint x, y, width, height;
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  if (GTK_WIDGET_DRAWABLE (widget))
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    {
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      if (GTK_WIDGET_NO_WINDOW (widget))
	{
	  x = widget->allocation.x;
	  y = widget->allocation.y;
	  width = widget->allocation.width;
	  height = widget->allocation.height;
	}
      else
	{
	  x = 0;
	  y = 0;
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	  gdk_drawable_get_size (widget->window, &width, &height);
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	}
      
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      gtk_paint_shadow (widget->style, widget->window,
		        GTK_STATE_NORMAL, GTK_SHADOW_OUT,
		        NULL, widget, "dnd",
			x, y, width, height);
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      gdk_draw_rectangle (widget->window,
			  widget->style->black_gc,
			  FALSE,
			  x, y, width - 1, height - 1);
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    }
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  return FALSE;
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}

/*************************************************************
 * gtk_drag_highlight:
 *     Highlight the given widget in the default manner.
 *   arguments:
 *     widget:
 *   results:
 *************************************************************/

void 
gtk_drag_highlight (GtkWidget  *widget)
{
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  g_return_if_fail (GTK_IS_WIDGET (widget));
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  g_signal_connect_after (widget, "expose_event",
			  G_CALLBACK (gtk_drag_highlight_expose),
			  NULL);
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  gtk_widget_queue_draw (widget);
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}

/*************************************************************
 * gtk_drag_unhighlight:
 *     Refresh the given widget to remove the highlight.
 *   arguments:
 *     widget:
 *   results:
 *************************************************************/

void 
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gtk_drag_unhighlight (GtkWidget *widget)
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{
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  g_return_if_fail (GTK_IS_WIDGET (widget));
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  g_signal_handlers_disconnect_by_func (widget,
					gtk_drag_highlight_expose,
					NULL);
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  gtk_widget_queue_draw (widget);
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}

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static void
gtk_drag_dest_set_internal (GtkWidget       *widget,
			    GtkDragDestSite *site)
{
  GtkDragDestSite *old_site;
  
  g_return_if_fail (widget != NULL);

  /* HACK, do this in the destroy */
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  old_site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
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  if (old_site)
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    {
      g_signal_handlers_disconnect_by_func (widget,
					    gtk_drag_dest_realized,
					    old_site);
      g_signal_handlers_disconnect_by_func (widget,
					    gtk_drag_dest_hierarchy_changed,
					    old_site);
    }
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  if (GTK_WIDGET_REALIZED (widget))
    gtk_drag_dest_realized (widget);

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  g_signal_connect (widget, "realize",
		    G_CALLBACK (gtk_drag_dest_realized), site);
  g_signal_connect (widget, "hierarchy_changed",
		    G_CALLBACK (gtk_drag_dest_hierarchy_changed), site);
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  g_object_set_data_full (G_OBJECT (widget), "gtk-drag-dest",
			  site, gtk_drag_dest_site_destroy);
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}
			    

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/*************************************************************
 * gtk_drag_dest_set:
 *     Register a drop site, and possibly add default behaviors.
 *   arguments:
 *     widget:    
 *     flags:     Which types of default drag behavior to use
 *     targets:   Table of targets that can be accepted
 *     n_targets: Number of of entries in targets
 *     actions:   
 *   results:
 *************************************************************/

void 
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gtk_drag_dest_set   (GtkWidget            *widget,
		     GtkDestDefaults       flags,
		     const GtkTargetEntry *targets,
		     gint                  n_targets,
		     GdkDragAction         actions)
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{
  GtkDragDestSite *site;
  
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  g_return_if_fail (GTK_IS_WIDGET (widget));
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  site = g_new (GtkDragDestSite, 1);
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  site->flags = flags;
  site->have_drag = FALSE;
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  if (targets)
    site->target_list = gtk_target_list_new (targets, n_targets);
  else
    site->target_list = NULL;
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  site->actions = actions;
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  site->do_proxy = FALSE;
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  site->proxy_window = NULL;
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  gtk_drag_dest_set_internal (widget, site);
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}

/*************************************************************
 * gtk_drag_dest_set_proxy:
 *     Set up this widget to proxy drags elsewhere.
 *   arguments:
 *     widget:          
 *     proxy_window:    window to which forward drag events
 *     protocol:        Drag protocol which the dest widget accepts
 *     use_coordinates: If true, send the same coordinates to the
 *                      destination, because it is a embedded 
 *                      subwindow.
 *   results:
 *************************************************************/

void 
gtk_drag_dest_set_proxy (GtkWidget      *widget,
			 GdkWindow      *proxy_window,
			 GdkDragProtocol protocol,
			 gboolean        use_coordinates)
{
  GtkDragDestSite *site;
  
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  g_return_if_fail (GTK_IS_WIDGET (widget));
  g_return_if_fail (!proxy_window || GDK_IS_WINDOW (proxy_window));
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  site = g_new (GtkDragDestSite, 1);
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  site->flags = 0;
  site->have_drag = FALSE;
  site->target_list = NULL;
  site->actions = 0;
  site->proxy_window = proxy_window;
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  if (proxy_window)
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    g_object_ref (proxy_window);
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  site->do_proxy = TRUE;
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  site->proxy_protocol = protocol;
  site->proxy_coords = use_coordinates;
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  gtk_drag_dest_set_internal (widget, site);
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}

/*************************************************************
 * gtk_drag_dest_unset
 *     Unregister this widget as a drag target.
 *   arguments:
 *     widget:
 *   results:
 *************************************************************/

void 
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gtk_drag_dest_unset (GtkWidget *widget)
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{
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  g_return_if_fail (GTK_IS_WIDGET (widget));
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  g_object_set_data (G_OBJECT (widget), "gtk-drag-dest", NULL);
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}

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/**
 * gtk_drag_dest_get_target_list:
 * @widget: a #GtkWidget
 * 
 * Returns the list of targets this widget can accept from
 * drag-and-drop.
 * 
 * Return value: the #GtkTargetList, or %NULL if none
 **/
GtkTargetList*
gtk_drag_dest_get_target_list (GtkWidget *widget)
{
  GtkDragDestSite *site;
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  g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
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  site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
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  return site ? site->target_list : NULL;  
}

/**
 * gtk_drag_dest_set_target_list:
 * @widget: a #GtkWidget that's a drag destination
 * @target_list: list of droppable targets, or %NULL for none
 * 
 * Sets the target types that this widget can accept from drag-and-drop.
 * The widget must first be made into a drag destination with
 * gtk_drag_dest_set().
 **/
void
gtk_drag_dest_set_target_list (GtkWidget      *widget,
                               GtkTargetList  *target_list)
{
  GtkDragDestSite *site;
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  g_return_if_fail (GTK_IS_WIDGET (widget));
  
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  site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
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  if (!site)
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    {
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      g_warning ("Can't set a target list on a widget until you've called gtk_drag_dest_set() "
                 "to make the widget into a drag destination");
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      return;
    }

  if (target_list)
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    gtk_target_list_ref (target_list);
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  if (site->target_list)
    gtk_target_list_unref (site->target_list);

  site->target_list = target_list;
}

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/**
 * gtk_drag_dest_add_text_targets:
 * @widget: a #GtkWidget that's a drag destination
 *
 * Add the text targets supported by #GtkSelection to
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 * the target list of the drag destination. The targets
 * are added with @info = 0. If you need another value, 
 * use gtk_target_list_add_text_targets() and
 * gtk_drag_dest_set_target_list().
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 * 
 * Since: 2.6
 **/
void
gtk_drag_dest_add_text_targets (GtkWidget *widget)
{
  GtkTargetList *target_list;

  target_list = gtk_drag_dest_get_target_list (widget);
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  if (target_list)
    gtk_target_list_ref (target_list);
  else
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    target_list = gtk_target_list_new (NULL, 0);
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  gtk_target_list_add_text_targets (target_list, 0);
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  gtk_drag_dest_set_target_list (widget, target_list);
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  gtk_target_list_unref (target_list);
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}
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/**
 * gtk_drag_dest_add_image_targets:
 * @widget: a #GtkWidget that's a drag destination
 *
 * Add the image targets supported by #GtkSelection to
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 * the target list of the drag destination. The targets
 * are added with @info = 0. If you need another value, 
 * use gtk_target_list_add_image_targets() and
 * gtk_drag_dest_set_target_list().
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 * 
 * Since: 2.6
 **/
void
gtk_drag_dest_add_image_targets (GtkWidget *widget)
{
  GtkTargetList *target_list;

  target_list = gtk_drag_dest_get_target_list (widget);
  if (target_list)
    gtk_target_list_ref (target_list);
  else
    target_list = gtk_target_list_new (NULL, 0);
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  gtk_target_list_add_image_targets (target_list, 0, FALSE);
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  gtk_drag_dest_set_target_list (widget, target_list);
  gtk_target_list_unref (target_list);
}

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/**
 * gtk_drag_dest_add_uri_targets:
 * @widget: a #GtkWidget that's a drag destination
 *
 * Add the URI targets supported by #GtkSelection to
 * the target list of the drag destination. The targets
 * are added with @info = 0. If you need another value, 
 * use gtk_target_list_add_uri_targets() and
 * gtk_drag_dest_set_target_list().
 * 
 * Since: 2.6
 **/
void
gtk_drag_dest_add_uri_targets (GtkWidget *widget)
{
  GtkTargetList *target_list;

  target_list = gtk_drag_dest_get_target_list (widget);
  if (target_list)
    gtk_target_list_ref (target_list);
  else
    target_list = gtk_target_list_new (NULL, 0);
  gtk_target_list_add_uri_targets (target_list, 0);
  gtk_drag_dest_set_target_list (widget, target_list);
  gtk_target_list_unref (target_list);
}

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/*************************************************************
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 * _gtk_drag_dest_handle_event:
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 *     Called from widget event handling code on Drag events
 *     for destinations.
 *
 *   arguments:
 *     toplevel: Toplevel widget that received the event
 *     event:
 *   results:
 *************************************************************/

void
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_gtk_drag_dest_handle_event (GtkWidget *toplevel,
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			    GdkEvent  *event)
{
  GtkDragDestInfo *info;
  GdkDragContext *context;
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  g_return_if_fail (toplevel != NULL);
  g_return_if_fail (event != NULL);
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  context = event->dnd.context;
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  info = gtk_drag_get_dest_info (context, TRUE);
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  /* Find the widget for the event */
  switch (event->type)
    {
    case GDK_DRAG_ENTER:
      break;
      
    case GDK_DRAG_LEAVE:
      if (info->widget)
	{
	  gtk_drag_dest_leave (info->widget, context, event->dnd.time);
	  info->widget = NULL;
	}
      break;
      
    case GDK_DRAG_MOTION:
    case GDK_DROP_START:
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      {
	GtkDragFindData data;
	gint tx, ty;

	if (event->type == GDK_DROP_START)
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	  {
	    info->dropped = TRUE;
	    /* We send a leave here so that the widget unhighlights
	     * properly.
	     */
	    if (info->widget)
	      {
		gtk_drag_dest_leave (info->widget, context, event->dnd.time);
		info->widget = NULL;
	      }
	  }
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#ifdef GDK_WINDOWING_X11
	/* Hackaround for: http://bugzilla.gnome.org/show_bug.cgi?id=136112
	 *
	 * Currently gdk_window_get_position doesn't provide reliable
	 * information for embedded windows, so we call the much more
	 * expensive gdk_window_get_origin().
	 */
	if (GTK_IS_PLUG (toplevel))
	  gdk_window_get_origin (toplevel->window, &tx, &ty);
	else
#endif /* GDK_WINDOWING_X11 */
	  gdk_window_get_position (toplevel->window, &tx, &ty);
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	data.x = event->dnd.x_root - tx;
	data.y = event->dnd.y_root - ty;
 	data.context = context;
	data.info = info;
	data.found = FALSE;
	data.toplevel = TRUE;
	data.callback = (event->type == GDK_DRAG_MOTION) ?
	  gtk_drag_dest_motion : gtk_drag_dest_drop;
	data.time = event->dnd.time;
	
	gtk_drag_find_widget (toplevel, &data);

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	if (info->widget && !data.found)
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	  {
	    gtk_drag_dest_leave (info->widget, context, event->dnd.time);
	    info->widget = NULL;
	  }
	
	/* Send a reply.
	 */
	if (event->type == GDK_DRAG_MOTION)
	  {
	    if (!data.found)
	      gdk_drag_status (context, 0, event->dnd.time);
	  }
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	else if (event->type == GDK_DROP_START && !info->proxy_source)
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	  {
	    gdk_drop_reply (context, data.found, event->dnd.time);
            if ((context->protocol == GDK_DRAG_PROTO_MOTIF) && !data.found)
	      gtk_drag_finish (context, FALSE, FALSE, event->dnd.time);
	  }
      }
      break;

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    default:
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      g_assert_not_reached ();
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    }
}

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/**
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 * gtk_drag_dest_find_target:
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 * @widget: drag destination widget
 * @context: drag context
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 * @target_list: list of droppable targets, or %NULL to use
 *    gtk_drag_dest_get_target_list (@widget).
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 * 
 * Looks for a match between @context->targets and the
 * @dest_target_list, returning the first matching target, otherwise
 * returning %GDK_NONE. @dest_target_list should usually be the return
 * value from gtk_drag_dest_get_target_list(), but some widgets may
 * have different valid targets for different parts of the widget; in
 * that case, they will have to implement a drag_motion handler that
 * passes the correct target list to this function.
 * 
 * Return value: first target that the source offers and the dest can accept, or %GDK_NONE
 **/
GdkAtom
gtk_drag_dest_find_target (GtkWidget      *widget,
                           GdkDragContext *context,
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                           GtkTargetList  *target_list)
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{
  GList *tmp_target;
  GList *tmp_source = NULL;
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  GtkWidget *source_widget;
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  g_return_val_if_fail (GTK_IS_WIDGET (widget), GDK_NONE);
  g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_NONE);
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  g_return_val_if_fail (!context->is_source, GDK_NONE);

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  source_widget = gtk_drag_get_source_widget (context);

  if (target_list == NULL)
    target_list = gtk_drag_dest_get_target_list (widget);
  
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  if (target_list == NULL)
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    return GDK_NONE;
  
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  tmp_target = target_list->list;
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  while (tmp_target)
    {
      GtkTargetPair *pair = tmp_target->data;
      tmp_source = context->targets;
      while (tmp_source)
	{
	  if (tmp_source->data == GUINT_TO_POINTER (pair->target))
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	    {
	      if ((!(pair->flags & GTK_TARGET_SAME_APP) || source_widget) &&
		  (!(pair->flags & GTK_TARGET_SAME_WIDGET) || (source_widget == widget)))
		return pair->target;
	      else
		break;
	    }
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	  tmp_source = tmp_source->next;
	}
      tmp_target = tmp_target->next;
    }
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  return GDK_NONE;
}

static void
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gtk_drag_selection_received (GtkWidget        *widget,
			     GtkSelectionData *selection_data,
			     guint32           time,
			     gpointer          data)
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{
  GdkDragContext *context;
  GtkDragDestInfo *info;
  GtkWidget *drop_widget;
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  drop_widget = data;
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  context = g_object_get_data (G_OBJECT (widget), "drag-context");
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  info = gtk_drag_get_dest_info (context, FALSE);
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  if (info->proxy_data && 
      info->proxy_data->target == selection_data->target)
    {
      gtk_selection_data_set (info->proxy_data,
			      selection_data->type,
			      selection_data->format,
			      selection_data->data,
			      selection_data->length);
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      gtk_main_quit ();
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      return;
    }
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  if (selection_data->target == gdk_atom_intern ("DELETE", FALSE))
    {
      gtk_drag_finish (context, TRUE, FALSE, time);
    }
  else if ((selection_data->target == gdk_atom_intern ("XmTRANSFER_SUCCESS", FALSE)) ||
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	   (selection_data->target == gdk_atom_intern ("XmTRANSFER_FAILURE", FALSE)))
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    {
      /* Do nothing */
    }
  else
    {
      GtkDragDestSite *site;
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      site = g_object_get_data (G_OBJECT (drop_widget), "gtk-drag-dest");
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      if (site && site->target_list)
<