gtkdnd.c 70.1 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
 * 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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "gdk/gdkx.h"

#include "gtkdnd.h"
#include "gtkinvisible.h"
#include "gtkmain.h"
#include "gtksignal.h"
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#include "gtkwindow.h"
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static GSList *drag_widgets = NULL;
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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 */
  GdkColormap       *colormap;	         /* Colormap for drag icon */
  GdkPixmap         *pixmap;             /* Icon for drag data */
  GdkBitmap         *mask;
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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 */
  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 */
  GdkEvent          *last_event;  /* motion event waiting for response */
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  gint               start_x, start_y; /* Initial position */
  gint               cur_x, cur_y;     /* Current Position */
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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              drop_timeout; /* Timeout for aborting drop */
};

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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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  gboolean           do_proxy : 1;
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  gboolean           proxy_coords : 1;
  gboolean           have_drag : 1;
};
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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 */
  gboolean           dropped : 1;     /* Set after we receive a drop */
  guint32            proxy_drop_time; /* Timestamp for proxied drop */
  gboolean           proxy_drop_wait : 1; /* Set if we are waiting for a
					   * 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         (GdkDragAction action);
static GtkWidget*    gtk_drag_get_ipc_widget     (void);
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static void          gtk_drag_release_ipc_widget (GtkWidget *widget);

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static void          gtk_drag_highlight_paint  (GtkWidget  *widget);
static gboolean      gtk_drag_highlight_expose (GtkWidget      *widget,
						GdkEventExpose *event,
						gpointer        data);


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static GdkAtom   gtk_drag_dest_find_target    (GtkWidget          *widget,
					       GtkDragDestSite    *site,
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			                       GdkDragContext     *context);
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);
static void      gtk_drag_dest_info_destroy   (gpointer            data);
static void      gtk_drag_dest_realized       (GtkWidget          *widget);
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);

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);

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);
static void gtk_drag_source_info_destroy       (gpointer           data);
static gint gtk_drag_motion_cb                 (GtkWidget         *widget, 
					        GdkEventMotion    *event, 
					        gpointer           data);
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 gchar 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 gchar 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 gchar 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 gchar 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 gchar 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 gchar 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 gchar 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 gchar 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 gchar 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 gchar 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 gchar *bits;
  const gchar *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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/* XPM */
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static const gchar *drag_default_xpm[] = {
  "32 32 3 1",
  " 	c None",
  ".	c #000000",
  "+	c #FFFFFF",
  "                                ",
  "                                ",
  "                ..              ",
  "              ..+.              ",
  "             ..++..             ",
  "           ...++++.             ",
  "         ...++++++..            ",
  "       ...+++++++++.            ",
  "     ...+++++++++++..           ",
  "    ..+.++++++++++++..          ",
  "     .++.++++++++++++..         ",
  "     .+++.++++++++++++..        ",
  "     .++++.++++++++++++.        ",
  "     .+++.+++++++++++++..       ",
  "     .++.+++++++++++++++..      ",
  "     .+.+++++++++++++++++..     ",
  "     ..+++++++++++++++++++..    ",
  "     ..++++++++++++++++++++.    ",
  "     .++++++++++++++++++++..    ",
  "     ..+++++++++++++++++..      ",
  "      .++++++++++++++++..       ",
  "      ..+++++++++++++...        ",
  "       .++++++++++++..          ",
  "       ..+++++++++..            ",
  "        .++++++++..             ",
  "        ..++++++..              ",
  "         .+++++..               ",
  "          .++..                 ",
  "           ...                  ",
  "           ..                   ",
  "                                ",
  "                                ",
};
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/*********************
 * Utility functions *
 *********************/

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

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static GtkWidget*
gtk_drag_get_ipc_widget (void)
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{
  GtkWidget *result;
  
  if (drag_widgets)
    {
      GSList *tmp = drag_widgets;
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      result = drag_widgets->data;
      drag_widgets = drag_widgets->next;
      g_slist_free_1 (tmp);
    }
  else
    {
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      result = gtk_invisible_new ();
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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)
{
  drag_widgets = g_slist_prepend (drag_widgets, widget);
}

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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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  return;
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}

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static GdkCursor*
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gtk_drag_get_cursor (GdkDragAction action)
{
  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)
    {
      GdkColor fg, bg;
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      GdkPixmap *pixmap = 
	gdk_bitmap_create_from_data (NULL, 
				     drag_cursors[i].bits,
				     CURSOR_WIDTH, CURSOR_HEIGHT);
      GdkPixmap *mask = 
	gdk_bitmap_create_from_data (NULL, 
				     drag_cursors[i].mask,
				     CURSOR_WIDTH, CURSOR_HEIGHT);
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      gdk_color_white (gdk_colormap_get_system(), &bg);
      gdk_color_black (gdk_colormap_get_system(), &fg);
      
      drag_cursors[i].cursor = gdk_cursor_new_from_pixmap (pixmap, mask, &fg, &bg, 0, 0);
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      gdk_pixmap_unref (pixmap);
      gdk_pixmap_unref (mask);
    }
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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 (widget != NULL);
  g_return_if_fail (context != NULL);
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  selection_widget = gtk_drag_get_ipc_widget ();
  
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  gdk_drag_context_ref (context);
  gtk_widget_ref (widget);
  
  gtk_signal_connect (GTK_OBJECT (selection_widget), "selection_received",
		      GTK_SIGNAL_FUNC (gtk_drag_selection_received), widget);
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  gtk_object_set_data (GTK_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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  tmp_list = source_widgets;
  while (tmp_list)
    {
      GtkWidget *ipc_widget = tmp_list->data;
      
      if (ipc_widget->window == context->source_window)
	{
	  GtkDragSourceInfo *info;
604
	  
605
	  info = gtk_object_get_data (GTK_OBJECT (ipc_widget), "gtk-info");
606
	  
607 608
	  return info ? info->widget : NULL;
	}
609
      
610 611
      tmp_list = tmp_list->next;
    }
612
  
613 614 615
  return NULL;
}

616 617 618 619 620 621 622 623 624 625 626 627 628 629
/*************************************************************
 * 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,
630
		 gboolean        del,
631 632 633
		 guint32         time)
{
  GdkAtom target = GDK_NONE;
634
  
635
  g_return_if_fail (context != NULL);
636
  
637
  if (success && del)
638 639 640 641 642 643
    {
      target = gdk_atom_intern ("DELETE", FALSE);
    }
  else if (context->protocol == GDK_DRAG_PROTO_MOTIF)
    {
      target = gdk_atom_intern (success ? 
644 645
				"XmTRANSFER_SUCCESS" : 
				"XmTRANSFER_FAILURE",
646 647
				FALSE);
    }
648
  
649 650
  if (target != GDK_NONE)
    {
651 652
      GtkWidget *selection_widget = gtk_drag_get_ipc_widget ();
      
653 654 655 656 657 658 659 660
      gdk_drag_context_ref (context);
      
      gtk_object_set_data (GTK_OBJECT (selection_widget), "drag-context", context);
      gtk_signal_connect (GTK_OBJECT (selection_widget), "selection_received",
			  GTK_SIGNAL_FUNC (gtk_drag_selection_received),
			  NULL);
      
      gtk_selection_convert (selection_widget,
661
			     gdk_drag_get_selection (context),
662 663 664 665
			     target,
			     time);
    }
  
666
  if (!del)
667 668 669 670
    gdk_drop_finish (context, success, time);
}

/*************************************************************
671 672
 * gtk_drag_highlight_paint:
 *     Paint a highlight indicating drag status onto the widget.
673 674 675 676 677
 *   arguments:
 *     widget:
 *   results:
 *************************************************************/

678 679
static void 
gtk_drag_highlight_paint (GtkWidget  *widget)
680
{
681
  gint x, y, width, height;
682
  
683
  g_return_if_fail (widget != NULL);
684
  
685
  if (GTK_WIDGET_DRAWABLE (widget))
686
    {
687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
      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;
	  gdk_window_get_size (widget->window, &width, &height);
	}
      
      gtk_draw_shadow (widget->style, widget->window,
		       GTK_STATE_NORMAL, GTK_SHADOW_OUT,
		       x, y, width, height);
      
      gdk_draw_rectangle (widget->window,
			  widget->style->black_gc,
			  FALSE,
			  x, y, width - 1, height - 1);
709
    }
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
}

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

static gboolean
gtk_drag_highlight_expose (GtkWidget      *widget,
			   GdkEventExpose *event,
			   gpointer        data)
{
  gtk_drag_highlight_paint (widget);
  return TRUE;
}

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

void 
gtk_drag_highlight (GtkWidget  *widget)
{
  gtk_signal_connect_after (GTK_OBJECT (widget), "draw",
			    GTK_SIGNAL_FUNC (gtk_drag_highlight_expose),
			    NULL);
  gtk_signal_connect (GTK_OBJECT (widget), "expose_event",
		      GTK_SIGNAL_FUNC (gtk_drag_highlight_paint),
		      NULL);
748
  
749
  gtk_widget_queue_draw (widget);
750 751 752 753 754 755 756 757 758 759 760 761 762 763
}

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

void 
gtk_drag_unhighlight (GtkWidget  *widget)
{
  g_return_if_fail (widget != NULL);
764
  
765 766
  gtk_signal_disconnect_by_func (GTK_OBJECT (widget),
				 GTK_SIGNAL_FUNC (gtk_drag_highlight_paint),
767
				 NULL);
768 769 770 771 772
  gtk_signal_disconnect_by_func (GTK_OBJECT (widget),
				 GTK_SIGNAL_FUNC (gtk_drag_highlight_expose),
				 NULL);
  
  gtk_widget_queue_clear (widget);
773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
}

/*************************************************************
 * 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 
788 789 790 791 792
gtk_drag_dest_set   (GtkWidget            *widget,
		     GtkDestDefaults       flags,
		     const GtkTargetEntry *targets,
		     gint                  n_targets,
		     GdkDragAction         actions)
793 794 795 796
{
  GtkDragDestSite *site;
  
  g_return_if_fail (widget != NULL);
797
  
798 799 800 801
  /* HACK, do this in the destroy */
  site = gtk_object_get_data (GTK_OBJECT (widget), "gtk-drag-dest");
  if (site)
    gtk_signal_disconnect_by_data (GTK_OBJECT (widget), site);
802
  
803 804
  if (GTK_WIDGET_REALIZED (widget))
    gtk_drag_dest_realized (widget);
805
  
806 807
  gtk_signal_connect (GTK_OBJECT (widget), "realize",
		      GTK_SIGNAL_FUNC (gtk_drag_dest_realized), NULL);
808
  
809
  site = g_new (GtkDragDestSite, 1);
810
  
811 812 813 814 815 816
  site->flags = flags;
  site->have_drag = FALSE;
  if (targets)
    site->target_list = gtk_target_list_new (targets, n_targets);
  else
    site->target_list = NULL;
817
  
818
  site->actions = actions;
819
  site->do_proxy = FALSE;
820
  
821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846
  gtk_object_set_data_full (GTK_OBJECT (widget), "gtk-drag-dest",
			    site, gtk_drag_dest_site_destroy);
}

/*************************************************************
 * 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;
  
  g_return_if_fail (widget != NULL);
847
  
848 849 850 851
  /* HACK, do this in the destroy */
  site = gtk_object_get_data (GTK_OBJECT (widget), "gtk-drag-dest");
  if (site)
    gtk_signal_disconnect_by_data (GTK_OBJECT (widget), site);
852
  
853 854
  if (GTK_WIDGET_REALIZED (widget))
    gtk_drag_dest_realized (widget);
855
  
856 857
  gtk_signal_connect (GTK_OBJECT (widget), "realize",
		      GTK_SIGNAL_FUNC (gtk_drag_dest_realized), NULL);
858
  
859
  site = g_new (GtkDragDestSite, 1);
860
  
861 862 863 864 865
  site->flags = 0;
  site->have_drag = FALSE;
  site->target_list = NULL;
  site->actions = 0;
  site->proxy_window = proxy_window;
866 867 868
  if (proxy_window)
    gdk_window_ref (proxy_window);
  site->do_proxy = TRUE;
869 870
  site->proxy_protocol = protocol;
  site->proxy_coords = use_coordinates;
871
  
872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887
  gtk_object_set_data_full (GTK_OBJECT (widget), "gtk-drag-dest",
			    site, gtk_drag_dest_site_destroy);
}

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

void 
gtk_drag_dest_unset (GtkWidget        *widget)
{
  g_return_if_fail (widget != NULL);
888
  
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
  gtk_object_set_data (GTK_OBJECT (widget), "gtk-drag-dest", NULL);
}

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

void
gtk_drag_dest_handle_event (GtkWidget *toplevel,
			    GdkEvent  *event)
{
  GtkDragDestInfo *info;
  GdkDragContext *context;
909
  
910 911
  g_return_if_fail (toplevel != NULL);
  g_return_if_fail (event != NULL);
912
  
913
  context = event->dnd.context;
914
  
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
  info = g_dataset_get_data (context, "gtk-info");
  if (!info)
    {
      info = g_new (GtkDragDestInfo, 1);
      info->widget = NULL;
      info->context = event->dnd.context;
      info->proxy_source = NULL;
      info->proxy_data = NULL;
      info->dropped = FALSE;
      info->proxy_drop_wait = FALSE;
      g_dataset_set_data_full (context,
			       "gtk-info",
			       info,
			       gtk_drag_dest_info_destroy);
    }
930
  
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
  /* 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:
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
    {
      GtkDragFindData data;
      gint tx, ty;
      
      if (event->type == GDK_DROP_START)
	info->dropped = TRUE;
      
      gdk_window_get_origin (toplevel->window, &tx, &ty);
      
      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);
      
      /* We send a leave here so that the widget unhighlights
       * properly
       */
      if (info->widget &&
	  ((event->type == GDK_DROP_START) || (!data.found)))
	{
	  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);
	}
      else if (event->type == GDK_DROP_START)
	{
	  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;
    
994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
    default:
      g_assert_not_reached();
    }
}

/*************************************************************
 * gtk_drag_dest_find_target:
 *     Decide on a target for the drag.
 *   arguments:
 *     site:
 *     context:
 *   results:
 *************************************************************/

static GdkAtom
1009 1010
gtk_drag_dest_find_target (GtkWidget       *widget,
			   GtkDragDestSite *site,
1011 1012 1013 1014
			   GdkDragContext  *context)
{
  GList *tmp_target;
  GList *tmp_source = NULL;
1015
  GtkWidget *source_widget = gtk_drag_get_source_widget (context);
1016
  
1017 1018 1019 1020 1021 1022 1023 1024
  tmp_target = site->target_list->list;
  while (tmp_target)
    {
      GtkTargetPair *pair = tmp_target->data;
      tmp_source = context->targets;
      while (tmp_source)
	{
	  if (tmp_source->data == GUINT_TO_POINTER (pair->target))
1025 1026 1027 1028 1029 1030 1031
	    {
	      if ((!(pair->flags & GTK_TARGET_SAME_APP) || source_widget) &&
		  (!(pair->flags & GTK_TARGET_SAME_WIDGET) || (source_widget == widget)))
		return pair->target;
	      else
		break;
	    }
1032 1033 1034 1035
	  tmp_source = tmp_source->next;
	}
      tmp_target = tmp_target->next;
    }
1036
  
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
  return GDK_NONE;
}

static void
gtk_drag_selection_received (GtkWidget          *widget,
			     GtkSelectionData   *selection_data,
			     guint32             time,
			     gpointer            data)
{
  GdkDragContext *context;
  GtkDragDestInfo *info;
  GtkWidget *drop_widget;
1049
  
1050
  drop_widget = data;
1051
  
1052 1053
  context = gtk_object_get_data (GTK_OBJECT (widget), "drag-context");
  info = g_dataset_get_data (context, "gtk-info");
1054
  
1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065
  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);
      gtk_main_quit();
      return;
    }
1066
  
1067 1068 1069 1070 1071
  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)) ||
1072
	   (selection_data->target == gdk_atom_intern ("XmTRANSFER_FAILURE", FALSE)))
1073 1074 1075 1076 1077 1078
    {
      /* Do nothing */
    }
  else
    {
      GtkDragDestSite *site;
1079
      
1080
      site = gtk_object_get_data (GTK_OBJECT (drop_widget), "gtk-drag-dest");
1081
      
1082 1083 1084
      if (site->target_list)
	{
	  guint target_info;
1085
	  
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108
	  if (gtk_target_list_find (site->target_list, 
				    selection_data->target,
				    &target_info))
	    {
	      if (!(site->flags & GTK_DEST_DEFAULT_DROP) ||
		  selection_data->length >= 0)
		gtk_signal_emit_by_name (GTK_OBJECT (drop_widget), 
					 "drag_data_received",
					 context, info->drop_x, info->drop_y,
					 selection_data, 
					 target_info, time);
	    }
	}
      else
	{
	  gtk_signal_emit_by_name (GTK_OBJECT (drop_widget), 
				   "drag_data_received",
				   context, info->drop_x, info->drop_y,
				   selection_data, 0, time);
	}
      
      if (site->flags & GTK_DEST_DEFAULT_DROP)
	{
1109
	  
1110 1111 1112 1113 1114 1115 1116 1117
	  gtk_drag_finish (context, 
			   (selection_data->length >= 0),
			   (context->action == GDK_ACTION_MOVE),
			   time);
	}
      
      gtk_widget_unref (drop_widget);
    }
1118
  
1119 1120 1121 1122 1123 1124
  gtk_signal_disconnect_by_func (GTK_OBJECT (widget), 
				 GTK_SIGNAL_FUNC (gtk_drag_selection_received),
				 data);
  
  gtk_object_set_data (GTK_OBJECT (widget), "drag-context", NULL);
  gdk_drag_context_unref (context);
1125
  
1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
  gtk_drag_release_ipc_widget (widget);
}

/*************************************************************
 * gtk_drag_find_widget:
 *     Recursive callback used to locate widgets for 
 *     DRAG_MOTION and DROP_START events.
 *   arguments:
 *     
 *   results:
 *************************************************************/

static void
gtk_drag_find_widget (GtkWidget       *widget,
		      GtkDragFindData *data)
{
  GtkAllocation new_allocation;
  gint x_offset = 0;
  gint y_offset = 0;
1145
  
1146
  new_allocation = widget->allocation;
1147
  
1148
  if (data->found || !GTK_WIDGET_MAPPED (widget))
1149
    return;
1150
  
1151 1152 1153 1154 1155 1156
  /* Note that in the following code, we only count the
   * position as being inside a WINDOW widget if it is inside
   * widget->window; points that are outside of widget->window
   * but within the allocation are not counted. This is consistent
   * with the way we highlight drag targets.
   */
1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169
  if (!GTK_WIDGET_NO_WINDOW (widget))
    {
      new_allocation.x = 0;
      new_allocation.y = 0;
    }
  
  if (widget->parent)
    {
      GdkWindow *window = widget->window;
      while (window != widget->parent->window)
	{
	  gint tx, ty, twidth, theight;
	  gdk_window_get_size (window, &twidth, &theight);
1170
	  
1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
	  if (new_allocation.x < 0)
	    {
	      new_allocation.width += new_allocation.x;
	      new_allocation.x = 0;
	    }
	  if (new_allocation.y < 0)
	    {
	      new_allocation.height += new_allocation.y;
	      new_allocation.y = 0;
	    }
	  if (new_allocation.x + new_allocation.width > twidth)
	    new_allocation.width = twidth - new_allocation.x;
	  if (new_allocation.y + new_allocation.height > theight)
	    new_allocation.height = theight - new_allocation.y;
1185
	  
1186 1187 1188 1189 1190 1191 1192 1193 1194
	  gdk_window_get_position (window, &tx, &ty);
	  new_allocation.x += tx;
	  x_offset += tx;
	  new_allocation.y += ty;
	  y_offset += ty;
	  
	  window = gdk_window_get_parent (window);
	}
    }
1195
  
1196 1197 1198 1199
  if (data->toplevel ||
      ((data->x >= new_allocation.x) && (data->y >= new_allocation.y) &&
       (data->x < new_allocation.x + new_allocation.width) && 
       (data->y < new_allocation.y + new_allocation.height)))
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
    {
      /* First, check if the drag is in a valid drop site in
       * one of our children 
       */
      if (GTK_IS_CONTAINER (widget))
	{
	  GtkDragFindData new_data = *data;
	  
	  new_data.x -= x_offset;
	  new_data.y -= y_offset;
	  new_data.found = FALSE;
1211
	  new_data.toplevel = FALSE;
1212
	  
1213 1214 1215
	  gtk_container_forall (GTK_CONTAINER (widget),
				(GtkCallback)gtk_drag_find_widget,
				&new_data);
1216 1217 1218
	  
	  data->found = new_data.found;
	}
1219