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gtk2/gtk/gtkdnd.c
Matthias Clasen f185967ba1 Add some more annotation to the DND api
2010-04-03 20:59:07 -04:00

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/* GTK - The GIMP Toolkit
* Copyright (C) 1995-1999 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
* Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GTK+ Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GTK+ at ftp://ftp.gtk.org/pub/gtk/.
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include "gdkconfig.h"
#include "gdk/gdkkeysyms.h"
#ifdef GDK_WINDOWING_X11
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include "gdk/x11/gdkx.h"
#endif
#include "gtkdnd.h"
#include "gtkiconfactory.h"
#include "gtkicontheme.h"
#include "gtkimage.h"
#include "gtkinvisible.h"
#include "gtkmain.h"
#include "gtkplug.h"
#include "gtkstock.h"
#include "gtkwindow.h"
#include "gtkintl.h"
#include "gtkdndcursors.h"
#include "gtkalias.h"
static GSList *source_widgets = NULL;
typedef struct _GtkDragSourceSite GtkDragSourceSite;
typedef struct _GtkDragSourceInfo GtkDragSourceInfo;
typedef struct _GtkDragDestSite GtkDragDestSite;
typedef struct _GtkDragDestInfo GtkDragDestInfo;
typedef struct _GtkDragAnim GtkDragAnim;
typedef struct _GtkDragFindData GtkDragFindData;
typedef enum
{
GTK_DRAG_STATUS_DRAG,
GTK_DRAG_STATUS_WAIT,
GTK_DRAG_STATUS_DROP
} GtkDragStatus;
struct _GtkDragSourceSite
{
GdkModifierType start_button_mask;
GtkTargetList *target_list; /* Targets for drag data */
GdkDragAction actions; /* Possible actions */
/* Drag icon */
GtkImageType icon_type;
union
{
GtkImagePixmapData pixmap;
GtkImagePixbufData pixbuf;
GtkImageStockData stock;
GtkImageIconNameData name;
} icon_data;
GdkBitmap *icon_mask;
GdkColormap *colormap; /* Colormap for drag icon */
/* Stored button press information to detect drag beginning */
gint state;
gint x, y;
};
struct _GtkDragSourceInfo
{
GtkWidget *widget;
GtkTargetList *target_list; /* Targets for drag data */
GdkDragAction possible_actions; /* Actions allowed by source */
GdkDragContext *context; /* drag context */
GtkWidget *icon_window; /* Window for drag */
GtkWidget *fallback_icon; /* Window for drag used on other screens */
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 */
GtkDragStatus status; /* drag status */
GdkEvent *last_event; /* pending event */
gint start_x, start_y; /* Initial position */
gint cur_x, cur_y; /* Current Position */
GdkScreen *cur_screen; /* Current screen for pointer */
guint32 grab_time; /* timestamp for initial grab */
GList *selections; /* selections we've claimed */
GtkDragDestInfo *proxy_dest; /* Set if this is a proxy drag */
guint update_idle; /* Idle function to update the drag */
guint drop_timeout; /* Timeout for aborting drop */
guint destroy_icon : 1; /* If true, destroy icon_window
*/
guint have_grab : 1; /* Do we still have the pointer grab
*/
GdkPixbuf *icon_pixbuf;
GdkCursor *drag_cursors[6];
};
struct _GtkDragDestSite
{
GtkDestDefaults flags;
GtkTargetList *target_list;
GdkDragAction actions;
GdkWindow *proxy_window;
GdkDragProtocol proxy_protocol;
guint do_proxy : 1;
guint proxy_coords : 1;
guint have_drag : 1;
guint track_motion : 1;
};
struct _GtkDragDestInfo
{
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 */
guint dropped : 1; /* Set after we receive a drop */
guint32 proxy_drop_time; /* Timestamp for proxied drop */
guint 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 */
};
#define DROP_ABORT_TIME 300000
#define ANIM_STEP_TIME 50
#define ANIM_STEP_LENGTH 50
#define ANIM_MIN_STEPS 5
#define ANIM_MAX_STEPS 10
struct _GtkDragAnim
{
GtkDragSourceInfo *info;
gint step;
gint n_steps;
};
struct _GtkDragFindData
{
gint x;
gint y;
GdkDragContext *context;
GtkDragDestInfo *info;
gboolean found;
gboolean toplevel;
gboolean (*callback) (GtkWidget *widget, GdkDragContext *context,
gint x, gint y, guint32 time);
guint32 time;
};
/* Enumeration for some targets we handle internally */
enum {
TARGET_MOTIF_SUCCESS = 0x40000000,
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 */
static void gtk_drag_get_event_actions (GdkEvent *event,
gint button,
GdkDragAction actions,
GdkDragAction *suggested_action,
GdkDragAction *possible_actions);
static GdkCursor * gtk_drag_get_cursor (GdkDisplay *display,
GdkDragAction action,
GtkDragSourceInfo *info);
static void gtk_drag_update_cursor (GtkDragSourceInfo *info);
static GtkWidget *gtk_drag_get_ipc_widget (GtkWidget *widget);
static GtkWidget *gtk_drag_get_ipc_widget_for_screen (GdkScreen *screen);
static void gtk_drag_release_ipc_widget (GtkWidget *widget);
static gboolean gtk_drag_highlight_expose (GtkWidget *widget,
GdkEventExpose *event,
gpointer data);
static void gtk_drag_selection_received (GtkWidget *widget,
GtkSelectionData *selection_data,
guint 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,
GtkWidget *previous_toplevel);
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 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);
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,
GtkDragResult result,
guint time);
static void gtk_drag_cancel (GtkDragSourceInfo *info,
GtkDragResult result,
guint32 time);
static gboolean 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 gboolean gtk_drag_anim_timeout (gpointer data);
static void gtk_drag_remove_icon (GtkDragSourceInfo *info);
static void gtk_drag_source_info_destroy (GtkDragSourceInfo *info);
static void gtk_drag_add_update_idle (GtkDragSourceInfo *info);
static void gtk_drag_update (GtkDragSourceInfo *info,
GdkScreen *screen,
gint x_root,
gint y_root,
GdkEvent *event);
static gboolean gtk_drag_motion_cb (GtkWidget *widget,
GdkEventMotion *event,
gpointer data);
static gboolean gtk_drag_key_cb (GtkWidget *widget,
GdkEventKey *event,
gpointer data);
static gboolean gtk_drag_grab_broken_event_cb (GtkWidget *widget,
GdkEventGrabBroken *event,
gpointer data);
static void gtk_drag_grab_notify_cb (GtkWidget *widget,
gboolean was_grabbed,
gpointer data);
static gboolean gtk_drag_button_release_cb (GtkWidget *widget,
GdkEventButton *event,
gpointer data);
static gboolean gtk_drag_abort_timeout (gpointer data);
static void set_icon_stock_pixbuf (GdkDragContext *context,
const gchar *stock_id,
GdkPixbuf *pixbuf,
gint hot_x,
gint hot_y,
gboolean force_window);
/************************
* Cursor and Icon data *
************************/
static struct {
GdkDragAction action;
const gchar *name;
const guint8 *data;
GdkPixbuf *pixbuf;
GdkCursor *cursor;
} drag_cursors[] = {
{ GDK_ACTION_DEFAULT, NULL },
{ GDK_ACTION_ASK, "dnd-ask", dnd_cursor_ask, NULL, NULL },
{ GDK_ACTION_COPY, "dnd-copy", dnd_cursor_copy, NULL, NULL },
{ GDK_ACTION_MOVE, "dnd-move", dnd_cursor_move, NULL, NULL },
{ GDK_ACTION_LINK, "dnd-link", dnd_cursor_link, NULL, NULL },
{ 0 , "dnd-none", dnd_cursor_none, NULL, NULL },
};
static const gint n_drag_cursors = sizeof (drag_cursors) / sizeof (drag_cursors[0]);
/*********************
* Utility functions *
*********************/
static void
set_can_change_screen (GtkWidget *widget,
gboolean can_change_screen)
{
can_change_screen = can_change_screen != FALSE;
g_object_set_data (G_OBJECT (widget), I_("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;
}
static GtkWidget *
gtk_drag_get_ipc_widget_for_screen (GdkScreen *screen)
{
GtkWidget *result;
GSList *drag_widgets = g_object_get_data (G_OBJECT (screen),
"gtk-dnd-ipc-widgets");
if (drag_widgets)
{
GSList *tmp = drag_widgets;
result = drag_widgets->data;
drag_widgets = drag_widgets->next;
g_object_set_data (G_OBJECT (screen),
I_("gtk-dnd-ipc-widgets"),
drag_widgets);
g_slist_free_1 (tmp);
}
else
{
result = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_screen (GTK_WINDOW (result), screen);
gtk_window_resize (GTK_WINDOW (result), 1, 1);
gtk_window_move (GTK_WINDOW (result), -100, -100);
gtk_widget_show (result);
}
return result;
}
static GtkWidget *
gtk_drag_get_ipc_widget (GtkWidget *widget)
{
GtkWidget *result;
GtkWidget *toplevel;
result = gtk_drag_get_ipc_widget_for_screen (gtk_widget_get_screen (widget));
toplevel = gtk_widget_get_toplevel (widget);
if (GTK_IS_WINDOW (toplevel))
{
if (GTK_WINDOW (toplevel)->group)
gtk_window_group_add_window (GTK_WINDOW (toplevel)->group,
GTK_WINDOW (result));
}
return result;
}
#ifdef GDK_WINDOWING_X11
/*
* We want to handle a handful of keys during DND, e.g. Escape to abort.
* Grabbing the keyboard has the unfortunate side-effect of preventing
* useful things such as using Alt-Tab to cycle between windows or
* switching workspaces. Therefore, we just grab the few keys we are
* interested in. Note that we need to put the grabs on the root window
* in order for them to still work when the focus is moved to another
* app/workspace.
*
* GDK needs a little help to successfully deliver root key events...
*/
static GdkFilterReturn
root_key_filter (GdkXEvent *xevent,
GdkEvent *event,
gpointer data)
{
XEvent *ev = (XEvent *)xevent;
if ((ev->type == KeyPress || ev->type == KeyRelease) &&
ev->xkey.root == ev->xkey.window)
ev->xkey.window = (Window)data;
return GDK_FILTER_CONTINUE;
}
typedef struct {
gint keysym;
gint modifiers;
} GrabKey;
static GrabKey grab_keys[] = {
{ XK_Escape, 0 },
{ XK_space, 0 },
{ XK_KP_Space, 0 },
{ XK_Return, 0 },
{ XK_KP_Enter, 0 },
{ XK_Up, 0 },
{ XK_Up, Mod1Mask },
{ XK_Down, 0 },
{ XK_Down, Mod1Mask },
{ XK_Left, 0 },
{ XK_Left, Mod1Mask },
{ XK_Right, 0 },
{ XK_Right, Mod1Mask },
{ XK_KP_Up, 0 },
{ XK_KP_Up, Mod1Mask },
{ XK_KP_Down, 0 },
{ XK_KP_Down, Mod1Mask },
{ XK_KP_Left, 0 },
{ XK_KP_Left, Mod1Mask },
{ XK_KP_Right, 0 },
{ XK_KP_Right, Mod1Mask }
};
static void
grab_dnd_keys (GtkWidget *widget,
guint32 time)
{
guint i;
GdkWindow *window, *root;
gint keycode;
window = widget->window;
root = gdk_screen_get_root_window (gtk_widget_get_screen (widget));
gdk_error_trap_push ();
for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
{
keycode = XKeysymToKeycode (GDK_WINDOW_XDISPLAY (window), grab_keys[i].keysym);
XGrabKey (GDK_WINDOW_XDISPLAY (window),
keycode, grab_keys[i].modifiers,
GDK_WINDOW_XID (root),
FALSE,
GrabModeAsync,
GrabModeAsync);
}
gdk_flush ();
gdk_error_trap_pop ();
gdk_window_add_filter (NULL, root_key_filter, (gpointer) GDK_WINDOW_XID (window));
}
static void
ungrab_dnd_keys (GtkWidget *widget,
guint32 time)
{
guint i;
GdkWindow *window, *root;
gint keycode;
window = widget->window;
root = gdk_screen_get_root_window (gtk_widget_get_screen (widget));
gdk_window_remove_filter (NULL, root_key_filter, (gpointer) GDK_WINDOW_XID (window));
gdk_error_trap_push ();
for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
{
keycode = XKeysymToKeycode (GDK_WINDOW_XDISPLAY (window), grab_keys[i].keysym);
XUngrabKey (GDK_WINDOW_XDISPLAY (window),
keycode, grab_keys[i].modifiers,
GDK_WINDOW_XID (root));
}
gdk_flush ();
gdk_error_trap_pop ();
}
#else
static void
grab_dnd_keys (GtkWidget *widget,
guint32 time)
{
gdk_keyboard_grab (widget->window, FALSE, time);
}
static void
ungrab_dnd_keys (GtkWidget *widget,
guint32 time)
{
gdk_display_keyboard_ungrab (gtk_widget_get_display (widget), time);
}
#endif
/***************************************************************
* gtk_drag_release_ipc_widget:
* Releases widget retrieved with gtk_drag_get_ipc_widget ()
* arguments:
* widget: the widget to release.
* results:
***************************************************************/
static void
gtk_drag_release_ipc_widget (GtkWidget *widget)
{
GtkWindow *window = GTK_WINDOW (widget);
GdkScreen *screen = gtk_widget_get_screen (widget);
GSList *drag_widgets = g_object_get_data (G_OBJECT (screen),
"gtk-dnd-ipc-widgets");
ungrab_dnd_keys (widget, GDK_CURRENT_TIME);
if (window->group)
gtk_window_group_remove_window (window->group, window);
drag_widgets = g_slist_prepend (drag_widgets, widget);
g_object_set_data (G_OBJECT (screen),
I_("gtk-dnd-ipc-widgets"),
drag_widgets);
}
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;
}
static void
gtk_drag_get_event_actions (GdkEvent *event,
gint button,
GdkDragAction actions,
GdkDragAction *suggested_action,
GdkDragAction *possible_actions)
{
*suggested_action = 0;
*possible_actions = 0;
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;
case GDK_ENTER_NOTIFY:
case GDK_LEAVE_NOTIFY:
state = event->crossing.state;
break;
default:
break;
}
if ((button == 2 || button == 3) && (actions & GDK_ACTION_ASK))
{
*suggested_action = GDK_ACTION_ASK;
*possible_actions = actions;
}
else if (state & (GDK_SHIFT_MASK | GDK_CONTROL_MASK))
{
if ((state & GDK_SHIFT_MASK) && (state & GDK_CONTROL_MASK))
{
if (actions & GDK_ACTION_LINK)
{
*suggested_action = GDK_ACTION_LINK;
*possible_actions = GDK_ACTION_LINK;
}
}
else if (state & GDK_CONTROL_MASK)
{
if (actions & GDK_ACTION_COPY)
{
*suggested_action = GDK_ACTION_COPY;
*possible_actions = GDK_ACTION_COPY;
}
return;
}
else
{
if (actions & GDK_ACTION_MOVE)
{
*suggested_action = GDK_ACTION_MOVE;
*possible_actions = GDK_ACTION_MOVE;
}
return;
}
}
else
{
*possible_actions = actions;
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;
else if (actions & GDK_ACTION_MOVE)
*suggested_action = GDK_ACTION_MOVE;
else if (actions & GDK_ACTION_LINK)
*suggested_action = GDK_ACTION_LINK;
}
}
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;
}
}
static gboolean
gtk_drag_can_use_rgba_cursor (GdkDisplay *display,
gint width,
gint height)
{
guint max_width, max_height;
if (!gdk_display_supports_cursor_color (display))
return FALSE;
if (!gdk_display_supports_cursor_alpha (display))
return FALSE;
gdk_display_get_maximal_cursor_size (display,
&max_width,
&max_height);
if (width > max_width || height > max_height)
{
/* can't use rgba cursor (too large) */
return FALSE;
}
return TRUE;
}
static GdkCursor *
gtk_drag_get_cursor (GdkDisplay *display,
GdkDragAction action,
GtkDragSourceInfo *info)
{
gint i;
/* reconstruct the cursors for each new drag (thus !info),
* to catch cursor theme changes
*/
if (!info)
{
for (i = 0 ; i < n_drag_cursors - 1; i++)
if (drag_cursors[i].cursor != NULL)
{
gdk_cursor_unref (drag_cursors[i].cursor);
drag_cursors[i].cursor = NULL;
}
}
for (i = 0 ; i < n_drag_cursors - 1; i++)
if (drag_cursors[i].action == action)
break;
if (drag_cursors[i].pixbuf == NULL)
drag_cursors[i].pixbuf =
gdk_pixbuf_new_from_inline (-1, drag_cursors[i].data, FALSE, NULL);
if (drag_cursors[i].cursor != NULL)
{
if (display != gdk_cursor_get_display (drag_cursors[i].cursor))
{
gdk_cursor_unref (drag_cursors[i].cursor);
drag_cursors[i].cursor = NULL;
}
}
if (drag_cursors[i].cursor == NULL)
drag_cursors[i].cursor = gdk_cursor_new_from_name (display, drag_cursors[i].name);
if (drag_cursors[i].cursor == NULL)
drag_cursors[i].cursor = gdk_cursor_new_from_pixbuf (display, drag_cursors[i].pixbuf, 0, 0);
if (info && info->icon_pixbuf)
{
gint cursor_width, cursor_height;
gint icon_width, icon_height;
gint width, height;
GdkPixbuf *cursor_pixbuf, *pixbuf;
gint hot_x, hot_y;
gint icon_x, icon_y, ref_x, ref_y;
if (info->drag_cursors[i] != NULL)
{
if (display == gdk_cursor_get_display (info->drag_cursors[i]))
return info->drag_cursors[i];
gdk_cursor_unref (info->drag_cursors[i]);
info->drag_cursors[i] = NULL;
}
icon_x = info->hot_x;
icon_y = info->hot_y;
icon_width = gdk_pixbuf_get_width (info->icon_pixbuf);
icon_height = gdk_pixbuf_get_height (info->icon_pixbuf);
hot_x = hot_y = 0;
cursor_pixbuf = gdk_cursor_get_image (drag_cursors[i].cursor);
if (!cursor_pixbuf)
cursor_pixbuf = g_object_ref (drag_cursors[i].pixbuf);
else
{
if (gdk_pixbuf_get_option (cursor_pixbuf, "x_hot"))
hot_x = atoi (gdk_pixbuf_get_option (cursor_pixbuf, "x_hot"));
if (gdk_pixbuf_get_option (cursor_pixbuf, "y_hot"))
hot_y = atoi (gdk_pixbuf_get_option (cursor_pixbuf, "y_hot"));
#if 0
/* The code below is an attempt to let cursor themes
* determine the attachment of the icon to enable things
* like the following:
*
* +-----+
* | |
* | ||
* +-----+|
* ---+
*
* It does not work since Xcursor doesn't allow to attach
* any additional information to cursors in a retrievable
* way (there are comments, but no way to get at them
* short of searching for the actual cursor file).
* If this code ever gets used, the icon_window placement
* must be changed to recognize these placement options
* as well. Note that this code ignores info->hot_x/y.
*/
for (j = 0; j < 10; j++)
{
const gchar *opt;
gchar key[32];
gchar **toks;
GtkAnchorType icon_anchor;
g_snprintf (key, 32, "comment%d", j);
opt = gdk_pixbuf_get_option (cursor_pixbuf, key);
if (opt && g_str_has_prefix ("icon-attach:", opt))
{
toks = g_strsplit (opt + strlen ("icon-attach:"), "'", -1);
if (g_strv_length (toks) != 3)
{
g_strfreev (toks);
break;
}
icon_anchor = atoi (toks[0]);
icon_x = atoi (toks[1]);
icon_y = atoi (toks[2]);
switch (icon_anchor)
{
case GTK_ANCHOR_NORTH:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_SOUTH:
icon_x += icon_width / 2;
break;
case GTK_ANCHOR_NORTH_EAST:
case GTK_ANCHOR_EAST:
case GTK_ANCHOR_SOUTH_EAST:
icon_x += icon_width;
break;
default: ;
}
switch (icon_anchor)
{
case GTK_ANCHOR_WEST:
case GTK_ANCHOR_CENTER:
case GTK_ANCHOR_EAST:
icon_y += icon_height / 2;
break;
case GTK_ANCHOR_SOUTH_WEST:
case GTK_ANCHOR_SOUTH:
case GTK_ANCHOR_SOUTH_EAST:
icon_x += icon_height;
break;
default: ;
}
g_strfreev (toks);
break;
}
}
#endif
}
cursor_width = gdk_pixbuf_get_width (cursor_pixbuf);
cursor_height = gdk_pixbuf_get_height (cursor_pixbuf);
ref_x = MAX (hot_x, icon_x);
ref_y = MAX (hot_y, icon_y);
width = ref_x + MAX (cursor_width - hot_x, icon_width - icon_x);
height = ref_y + MAX (cursor_height - hot_y, icon_height - icon_y);
if (gtk_drag_can_use_rgba_cursor (display, width, height))
{
/* Composite cursor and icon so that both hotspots
* end up at (ref_x, ref_y)
*/
pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB, TRUE, 8,
width, height);
gdk_pixbuf_fill (pixbuf, 0xff000000);
gdk_pixbuf_composite (info->icon_pixbuf, pixbuf,
ref_x - icon_x, ref_y - icon_y,
icon_width, icon_height,
ref_x - icon_x, ref_y - icon_y,
1.0, 1.0,
GDK_INTERP_BILINEAR, 255);
gdk_pixbuf_composite (cursor_pixbuf, pixbuf,
ref_x - hot_x, ref_y - hot_y,
cursor_width, cursor_height,
ref_x - hot_x, ref_y - hot_y,
1.0, 1.0,
GDK_INTERP_BILINEAR, 255);
info->drag_cursors[i] =
gdk_cursor_new_from_pixbuf (display, pixbuf, ref_x, ref_y);
g_object_unref (pixbuf);
}
g_object_unref (cursor_pixbuf);
if (info->drag_cursors[i] != NULL)
return info->drag_cursors[i];
}
return drag_cursors[i].cursor;
}
static void
gtk_drag_update_cursor (GtkDragSourceInfo *info)
{
GdkCursor *cursor;
gint i;
if (!info->have_grab)
return;
for (i = 0 ; i < n_drag_cursors - 1; i++)
if (info->cursor == drag_cursors[i].cursor ||
info->cursor == info->drag_cursors[i])
break;
if (i == n_drag_cursors)
return;
cursor = gtk_drag_get_cursor (gdk_cursor_get_display (info->cursor),
drag_cursors[i].action, info);
if (cursor != info->cursor)
{
gdk_pointer_grab (info->ipc_widget->window, FALSE,
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL,
cursor, info->grab_time);
info->cursor = 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;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (!context->is_source);
selection_widget = gtk_drag_get_ipc_widget (widget);
g_object_ref (context);
g_object_ref (widget);
g_signal_connect (selection_widget, "selection-received",
G_CALLBACK (gtk_drag_selection_received), widget);
g_object_set_data (G_OBJECT (selection_widget), I_("drag-context"), context);
gtk_selection_convert (selection_widget,
gdk_drag_get_selection (context),
target,
time);
}
/*************************************************************
* 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.
*************************************************************/
GtkWidget *
gtk_drag_get_source_widget (GdkDragContext *context)
{
GSList *tmp_list;
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
g_return_val_if_fail (!context->is_source, NULL);
tmp_list = source_widgets;
while (tmp_list)
{
GtkWidget *ipc_widget = tmp_list->data;
if (ipc_widget->window == context->source_window)
{
GtkDragSourceInfo *info;
info = g_object_get_data (G_OBJECT (ipc_widget), "gtk-info");
return info ? info->widget : NULL;
}
tmp_list = tmp_list->next;
}
return NULL;
}
/*************************************************************
* 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,
gboolean del,
guint32 time)
{
GdkAtom target = GDK_NONE;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (!context->is_source);
if (success && del)
{
target = gdk_atom_intern_static_string ("DELETE");
}
else if (context->protocol == GDK_DRAG_PROTO_MOTIF)
{
target = gdk_atom_intern_static_string (success ?
"XmTRANSFER_SUCCESS" :
"XmTRANSFER_FAILURE");
}
if (target != GDK_NONE)
{
GtkWidget *selection_widget = gtk_drag_get_ipc_widget_for_screen (gdk_drawable_get_screen (context->source_window));
g_object_ref (context);
g_object_set_data (G_OBJECT (selection_widget), I_("drag-context"), context);
g_signal_connect (selection_widget, "selection-received",
G_CALLBACK (gtk_drag_selection_received),
NULL);
gtk_selection_convert (selection_widget,
gdk_drag_get_selection (context),
target,
time);
}
if (!(success && del))
gdk_drop_finish (context, success, time);
}
/*************************************************************
* 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)
{
gint x, y, width, height;
if (gtk_widget_is_drawable (widget))
{
cairo_t *cr;
if (!gtk_widget_get_has_window (widget))
{
x = widget->allocation.x;
y = widget->allocation.y;
width = widget->allocation.width;
height = widget->allocation.height;
}
else
{
x = 0;
y = 0;
gdk_drawable_get_size (widget->window, &width, &height);
}
gtk_paint_shadow (widget->style, widget->window,
GTK_STATE_NORMAL, GTK_SHADOW_OUT,
&event->area, widget, "dnd",
x, y, width, height);
cr = gdk_cairo_create (widget->window);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
cairo_set_line_width (cr, 1.0);
cairo_rectangle (cr,
x + 0.5, y + 0.5,
width - 1, height - 1);
cairo_stroke (cr);
cairo_destroy (cr);
}
return FALSE;
}
/*************************************************************
* gtk_drag_highlight:
* Highlight the given widget in the default manner.
* arguments:
* widget:
* results:
*************************************************************/
void
gtk_drag_highlight (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_signal_connect_after (widget, "expose-event",
G_CALLBACK (gtk_drag_highlight_expose),
NULL);
gtk_widget_queue_draw (widget);
}
/*************************************************************
* gtk_drag_unhighlight:
* Refresh the given widget to remove the highlight.
* arguments:
* widget:
* results:
*************************************************************/
void
gtk_drag_unhighlight (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_signal_handlers_disconnect_by_func (widget,
gtk_drag_highlight_expose,
NULL);
gtk_widget_queue_draw (widget);
}
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 */
old_site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
if (old_site)
{
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);
site->track_motion = old_site->track_motion;
}
if (gtk_widget_get_realized (widget))
gtk_drag_dest_realized (widget);
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);
g_object_set_data_full (G_OBJECT (widget), I_("gtk-drag-dest"),
site, gtk_drag_dest_site_destroy);
}
/**
* gtk_drag_dest_set:
* @widget: a #GtkWidget
* @flags: which types of default drag behavior to use
* @targets: (allow-none) (array length=n_targets): a pointer to an array of #GtkTargetEntry<!-- -->s
* indicating the drop types that this @widget will accept, or %NULL.
* Later you can access the list with gtk_drag_dest_get_target_list()
* and gtk_drag_dest_find_target().
* @n_targets: the number of entries in @targets
* @actions: a bitmask of possible actions for a drop onto this @widget.
*
* Sets a widget as a potential drop destination, and adds default behaviors.
*
* The default behaviors listed in @flags have an effect similar
* to installing default handlers for the widget's drag-and-drop signals
* (#GtkWidget:drag-motion, #GtkWidget:drag-drop, ...). They all exist
* for convenience. When passing #GTK_DEST_DEFAULT_ALL for instance it is
* sufficient to connect to the widget's #GtkWidget::drag-data-received
* signal to get primitive, but consistent drag-and-drop support.
*
* Things become more complicated when you try to preview the dragged data,
* as described in the documentation for #GtkWidget:drag-motion. The default
* behaviors described by @flags make some assumptions, that can conflict
* with your own signal handlers. For instance #GTK_DEST_DEFAULT_DROP causes
* invokations of gdk_drag_status() in the context of #GtkWidget:drag-motion,
* and invokations of gtk_drag_finish() in #GtkWidget:drag-data-received.
* Especially the later is dramatic, when your own #GtkWidget:drag-motion
* handler calls gtk_drag_get_data() to inspect the dragged data.
*
* There's no way to set a default action here, you can use the
* #GtkWidget:drag-motion callback for that. Here's an example which selects
* the action to use depending on whether the control key is pressed or not:
* |[
* static void
* drag_motion (GtkWidget *widget,
* GdkDragContext *context,
* gint x,
* gint y,
* guint time)
* {
* GdkModifierType mask;
*
* gdk_window_get_pointer (gtk_widget_get_window (widget),
* NULL, NULL, &mask);
* if (mask & GDK_CONTROL_MASK)
* gdk_drag_status (context, GDK_ACTION_COPY, time);
* else
* gdk_drag_status (context, GDK_ACTION_MOVE, time);
* }
* ]|
*/
void
gtk_drag_dest_set (GtkWidget *widget,
GtkDestDefaults flags,
const GtkTargetEntry *targets,
gint n_targets,
GdkDragAction actions)
{
GtkDragDestSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
site = g_new (GtkDragDestSite, 1);
site->flags = flags;
site->have_drag = FALSE;
if (targets)
site->target_list = gtk_target_list_new (targets, n_targets);
else
site->target_list = NULL;
site->actions = actions;
site->do_proxy = FALSE;
site->proxy_window = NULL;
site->track_motion = FALSE;
gtk_drag_dest_set_internal (widget, site);
}
/*************************************************************
* 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 (GTK_IS_WIDGET (widget));
g_return_if_fail (!proxy_window || GDK_IS_WINDOW (proxy_window));
site = g_new (GtkDragDestSite, 1);
site->flags = 0;
site->have_drag = FALSE;
site->target_list = NULL;
site->actions = 0;
site->proxy_window = proxy_window;
if (proxy_window)
g_object_ref (proxy_window);
site->do_proxy = TRUE;
site->proxy_protocol = protocol;
site->proxy_coords = use_coordinates;
site->track_motion = FALSE;
gtk_drag_dest_set_internal (widget, site);
}
/*************************************************************
* gtk_drag_dest_unset
* Unregister this widget as a drag target.
* arguments:
* widget:
* results:
*************************************************************/
void
gtk_drag_dest_unset (GtkWidget *widget)
{
GtkDragDestSite *old_site;
g_return_if_fail (GTK_IS_WIDGET (widget));
old_site = g_object_get_data (G_OBJECT (widget),
"gtk-drag-dest");
if (old_site)
{
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);
}
g_object_set_data (G_OBJECT (widget), I_("gtk-drag-dest"), NULL);
}
/**
* 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;
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
return site ? site->target_list : NULL;
}
/**
* gtk_drag_dest_set_target_list:
* @widget: a #GtkWidget that's a drag destination
* @target_list: (allow-none): 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;
g_return_if_fail (GTK_IS_WIDGET (widget));
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
if (!site)
{
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");
return;
}
if (target_list)
gtk_target_list_ref (target_list);
if (site->target_list)
gtk_target_list_unref (site->target_list);
site->target_list = target_list;
}
/**
* gtk_drag_dest_add_text_targets:
* @widget: a #GtkWidget that's a drag destination
*
* Add the text 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_text_targets() and
* gtk_drag_dest_set_target_list().
*
* Since: 2.6
**/
void
gtk_drag_dest_add_text_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_text_targets (target_list, 0);
gtk_drag_dest_set_target_list (widget, target_list);
gtk_target_list_unref (target_list);
}
/**
* gtk_drag_dest_add_image_targets:
* @widget: a #GtkWidget that's a drag destination
*
* Add the image 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_image_targets() and
* gtk_drag_dest_set_target_list().
*
* 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);
gtk_target_list_add_image_targets (target_list, 0, FALSE);
gtk_drag_dest_set_target_list (widget, target_list);
gtk_target_list_unref (target_list);
}
/**
* 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);
}
/**
* gtk_drag_dest_set_track_motion:
* @widget: a #GtkWidget that's a drag destination
* @track_motion: whether to accept all targets
*
* Tells the widget to emit ::drag-motion and ::drag-leave
* events regardless of the targets and the %GTK_DEST_DEFAULT_MOTION
* flag.
*
* This may be used when a widget wants to do generic
* actions regardless of the targets that the source offers.
*
* Since: 2.10
**/
void
gtk_drag_dest_set_track_motion (GtkWidget *widget,
gboolean track_motion)
{
GtkDragDestSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_if_fail (site != NULL);
site->track_motion = track_motion != FALSE;
}
/**
* gtk_drag_dest_get_track_motion:
* @widget: a #GtkWidget that's a drag destination
*
* Returns whether the widget has been configured to always
* emit ::drag-motion signals.
*
* Return Value: %TRUE if the widget always emits ::drag-motion events
*
* Since: 2.10
**/
gboolean
gtk_drag_dest_get_track_motion (GtkWidget *widget)
{
GtkDragDestSite *site;
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
if (site)
return site->track_motion;
return FALSE;
}
/*************************************************************
* _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;
g_return_if_fail (toplevel != NULL);
g_return_if_fail (event != NULL);
context = event->dnd.context;
info = gtk_drag_get_dest_info (context, TRUE);
/* 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:
{
GtkDragFindData data;
gint tx, ty;
if (event->type == GDK_DROP_START)
{
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;
}
}
#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);
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);
if (info->widget && !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 && !info->proxy_source)
{
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;
default:
g_assert_not_reached ();
}
}
/**
* gtk_drag_dest_find_target:
* @widget: drag destination widget
* @context: drag context
* @target_list: (allow-none): list of droppable targets, or %NULL to use
* gtk_drag_dest_get_target_list (@widget).
*
* 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,
GtkTargetList *target_list)
{
GList *tmp_target;
GList *tmp_source = NULL;
GtkWidget *source_widget;
g_return_val_if_fail (GTK_IS_WIDGET (widget), GDK_NONE);
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), GDK_NONE);
g_return_val_if_fail (!context->is_source, GDK_NONE);
source_widget = gtk_drag_get_source_widget (context);
if (target_list == NULL)
target_list = gtk_drag_dest_get_target_list (widget);
if (target_list == NULL)
return GDK_NONE;
tmp_target = 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))
{
if ((!(pair->flags & GTK_TARGET_SAME_APP) || source_widget) &&
(!(pair->flags & GTK_TARGET_SAME_WIDGET) || (source_widget == widget)) &&
(!(pair->flags & GTK_TARGET_OTHER_APP) || !source_widget) &&
(!(pair->flags & GTK_TARGET_OTHER_WIDGET) || (source_widget != widget)))
return pair->target;
else
break;
}
tmp_source = tmp_source->next;
}
tmp_target = tmp_target->next;
}
return GDK_NONE;
}
static void
gtk_drag_selection_received (GtkWidget *widget,
GtkSelectionData *selection_data,
guint time,
gpointer data)
{
GdkDragContext *context;
GtkDragDestInfo *info;
GtkWidget *drop_widget;
drop_widget = data;
context = g_object_get_data (G_OBJECT (widget), "drag-context");
info = gtk_drag_get_dest_info (context, FALSE);
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;
}
if (selection_data->target == gdk_atom_intern_static_string ("DELETE"))
{
gtk_drag_finish (context, TRUE, FALSE, time);
}
else if ((selection_data->target == gdk_atom_intern_static_string ("XmTRANSFER_SUCCESS")) ||
(selection_data->target == gdk_atom_intern_static_string ("XmTRANSFER_FAILURE")))
{
/* Do nothing */
}
else
{
GtkDragDestSite *site;
site = g_object_get_data (G_OBJECT (drop_widget), "gtk-drag-dest");
if (site && site->target_list)
{
guint target_info;
if (gtk_target_list_find (site->target_list,
selection_data->target,
&target_info))
{
if (!(site->flags & GTK_DEST_DEFAULT_DROP) ||
selection_data->length >= 0)
g_signal_emit_by_name (drop_widget,
"drag-data-received",
context, info->drop_x, info->drop_y,
selection_data,
target_info, time);
}
}
else
{
g_signal_emit_by_name (drop_widget,
"drag-data-received",
context, info->drop_x, info->drop_y,
selection_data,
0, time);
}
if (site && site->flags & GTK_DEST_DEFAULT_DROP)
{
gtk_drag_finish (context,
(selection_data->length >= 0),
(context->action == GDK_ACTION_MOVE),
time);
}
g_object_unref (drop_widget);
}
g_signal_handlers_disconnect_by_func (widget,
gtk_drag_selection_received,
data);
g_object_set_data (G_OBJECT (widget), I_("drag-context"), NULL);
g_object_unref (context);
gtk_drag_release_ipc_widget (widget);
}
static void
prepend_and_ref_widget (GtkWidget *widget,
gpointer data)
{
GSList **slist_p = data;
*slist_p = g_slist_prepend (*slist_p, g_object_ref (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 allocation_to_window_x = 0;
gint allocation_to_window_y = 0;
gint x_offset = 0;
gint y_offset = 0;
if (data->found || !gtk_widget_get_mapped (widget) || !gtk_widget_get_sensitive (widget))
return;
/* 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.
*
* data->x,y are relative to widget->parent->window (if
* widget is not a toplevel, widget->window otherwise).
* We compute the allocation of widget in the same coordinates,
* clipping to widget->window, and all intermediate
* windows. If data->x,y is inside that, then we translate
* our coordinates to be relative to widget->window and
* recurse.
*/
new_allocation = widget->allocation;
if (widget->parent)
{
gint tx, ty;
GdkWindow *window = widget->window;
/* Compute the offset from allocation-relative to
* window-relative coordinates.
*/
allocation_to_window_x = widget->allocation.x;
allocation_to_window_y = widget->allocation.y;
if (gtk_widget_get_has_window (widget))
{
/* The allocation is relative to the parent window for
* window widgets, not to widget->window.
*/
gdk_window_get_position (window, &tx, &ty);
allocation_to_window_x -= tx;
allocation_to_window_y -= ty;
}
new_allocation.x = 0 + allocation_to_window_x;
new_allocation.y = 0 + allocation_to_window_y;
while (window && window != widget->parent->window)
{
GdkRectangle window_rect = { 0, 0, 0, 0 };
gdk_drawable_get_size (window, &window_rect.width, &window_rect.height);
gdk_rectangle_intersect (&new_allocation, &window_rect, &new_allocation);
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);
}
if (!window) /* Window and widget heirarchies didn't match. */
return;
}
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)))
{
/* 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;
GSList *children = NULL;
GSList *tmp_list;
new_data.x -= x_offset;
new_data.y -= y_offset;
new_data.found = FALSE;
new_data.toplevel = FALSE;
/* need to reference children temporarily in case the
* ::drag-motion/::drag-drop callbacks change the widget hierarchy.
*/
gtk_container_forall (GTK_CONTAINER (widget), prepend_and_ref_widget, &children);
for (tmp_list = children; tmp_list; tmp_list = tmp_list->next)
{
if (!new_data.found && gtk_widget_is_drawable (tmp_list->data))
gtk_drag_find_widget (tmp_list->data, &new_data);
g_object_unref (tmp_list->data);
}
g_slist_free (children);
data->found = new_data.found;
}
/* If not, and this widget is registered as a drop site, check to
* emit "drag-motion" to check if we are actually in
* a drop site.
*/
if (!data->found &&
g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"))
{
data->found = data->callback (widget,
data->context,
data->x - x_offset - allocation_to_window_x,
data->y - y_offset - allocation_to_window_y,
data->time);
/* If so, send a "drag-leave" to the last widget */
if (data->found)
{
if (data->info->widget && data->info->widget != widget)
{
gtk_drag_dest_leave (data->info->widget, data->context, data->time);
}
data->info->widget = widget;
}
}
}
}
static void
gtk_drag_proxy_begin (GtkWidget *widget,
GtkDragDestInfo *dest_info,
guint32 time)
{
GtkDragSourceInfo *source_info;
GList *tmp_list;
GdkDragContext *context;
GtkWidget *ipc_widget;
if (dest_info->proxy_source)
{
gdk_drag_abort (dest_info->proxy_source->context, time);
gtk_drag_source_info_destroy (dest_info->proxy_source);
dest_info->proxy_source = NULL;
}
ipc_widget = gtk_drag_get_ipc_widget (widget);
context = gdk_drag_begin (ipc_widget->window,
dest_info->context->targets);
source_info = gtk_drag_get_source_info (context, TRUE);
source_info->ipc_widget = ipc_widget;
source_info->widget = g_object_ref (widget);
source_info->target_list = gtk_target_list_new (NULL, 0);
tmp_list = dest_info->context->targets;
while (tmp_list)
{
gtk_target_list_add (source_info->target_list,
GDK_POINTER_TO_ATOM (tmp_list->data), 0, 0);
tmp_list = tmp_list->next;
}
source_info->proxy_dest = dest_info;
g_signal_connect (ipc_widget,
"selection-get",
G_CALLBACK (gtk_drag_selection_get),
source_info);
dest_info->proxy_source = source_info;
}
static void
gtk_drag_dest_info_destroy (gpointer data)
{
GtkDragDestInfo *info = data;
g_free (info);
}
static GtkDragDestInfo *
gtk_drag_get_dest_info (GdkDragContext *context,
gboolean create)
{
GtkDragDestInfo *info;
static GQuark info_quark = 0;
if (!info_quark)
info_quark = g_quark_from_static_string ("gtk-dest-info");
info = g_object_get_qdata (G_OBJECT (context), info_quark);
if (!info && create)
{
info = g_new (GtkDragDestInfo, 1);
info->widget = NULL;
info->context = context;
info->proxy_source = NULL;
info->proxy_data = NULL;
info->dropped = FALSE;
info->proxy_drop_wait = FALSE;
g_object_set_qdata_full (G_OBJECT (context), info_quark,
info, gtk_drag_dest_info_destroy);
}
return info;
}
static GQuark dest_info_quark = 0;
static GtkDragSourceInfo *
gtk_drag_get_source_info (GdkDragContext *context,
gboolean create)
{
GtkDragSourceInfo *info;
if (!dest_info_quark)
dest_info_quark = g_quark_from_static_string ("gtk-source-info");
info = g_object_get_qdata (G_OBJECT (context), dest_info_quark);
if (!info && create)
{
info = g_new0 (GtkDragSourceInfo, 1);
info->context = context;
g_object_set_qdata (G_OBJECT (context), dest_info_quark, info);
}
return info;
}
static void
gtk_drag_clear_source_info (GdkDragContext *context)
{
g_object_set_qdata (G_OBJECT (context), dest_info_quark, NULL);
}
static void
gtk_drag_dest_realized (GtkWidget *widget)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
if (gtk_widget_is_toplevel (toplevel))
gdk_window_register_dnd (toplevel->window);
}
static void
gtk_drag_dest_hierarchy_changed (GtkWidget *widget,
GtkWidget *previous_toplevel)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
if (gtk_widget_is_toplevel (toplevel) && gtk_widget_get_realized (toplevel))
gdk_window_register_dnd (toplevel->window);
}
static void
gtk_drag_dest_site_destroy (gpointer data)
{
GtkDragDestSite *site = data;
if (site->proxy_window)
g_object_unref (site->proxy_window);
if (site->target_list)
gtk_target_list_unref (site->target_list);
g_free (site);
}
/*
* Default drag handlers
*/
static void
gtk_drag_dest_leave (GtkWidget *widget,
GdkDragContext *context,
guint time)
{
GtkDragDestSite *site;
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_if_fail (site != NULL);
if (site->do_proxy)
{
GtkDragDestInfo *info = gtk_drag_get_dest_info (context, FALSE);
if (info->proxy_source && info->proxy_source->widget == widget && !info->dropped)
{
gdk_drag_abort (info->proxy_source->context, time);
gtk_drag_source_info_destroy (info->proxy_source);
info->proxy_source = NULL;
}
return;
}
else
{
if ((site->flags & GTK_DEST_DEFAULT_HIGHLIGHT) && site->have_drag)
gtk_drag_unhighlight (widget);
if (!(site->flags & GTK_DEST_DEFAULT_MOTION) || site->have_drag ||
site->track_motion)
g_signal_emit_by_name (widget, "drag-leave", context, time);
site->have_drag = FALSE;
}
}
static gboolean
gtk_drag_dest_motion (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time)
{
GtkDragDestSite *site;
GdkDragAction action = 0;
gboolean retval;
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_val_if_fail (site != NULL, FALSE);
if (site->do_proxy)
{
GdkAtom selection;
GdkEvent *current_event;
GdkWindow *dest_window;
GdkDragProtocol proto;
GtkDragDestInfo *info = gtk_drag_get_dest_info (context, FALSE);
if (!info->proxy_source || info->proxy_source->widget != widget)
gtk_drag_proxy_begin (widget, info, time);
current_event = gtk_get_current_event ();
if (site->proxy_window)
{
dest_window = site->proxy_window;
proto = site->proxy_protocol;
}
else
{
gdk_drag_find_window_for_screen (info->proxy_source->context,
NULL,
gdk_drawable_get_screen (current_event->dnd.window),
current_event->dnd.x_root,
current_event->dnd.y_root,
&dest_window, &proto);
}
gdk_drag_motion (info->proxy_source->context,
dest_window, proto,
current_event->dnd.x_root,
current_event->dnd.y_root,
context->suggested_action,
context->actions, time);
if (!site->proxy_window && dest_window)
g_object_unref (dest_window);
selection = gdk_drag_get_selection (info->proxy_source->context);
if (selection &&
selection != gdk_drag_get_selection (info->context))
gtk_drag_source_check_selection (info->proxy_source, selection, time);
gdk_event_free (current_event);
return TRUE;
}
if (site->track_motion || site->flags & GTK_DEST_DEFAULT_MOTION)
{
if (context->suggested_action & site->actions)
action = context->suggested_action;
else
{
gint i;
for (i = 0; i < 8; i++)
{
if ((site->actions & (1 << i)) &&
(context->actions & (1 << i)))
{
action = (1 << i);
break;
}
}
}
if (action && gtk_drag_dest_find_target (widget, context, NULL))
{
if (!site->have_drag)
{
site->have_drag = TRUE;
if (site->flags & GTK_DEST_DEFAULT_HIGHLIGHT)
gtk_drag_highlight (widget);
}
gdk_drag_status (context, action, time);
}
else
{
gdk_drag_status (context, 0, time);
if (!site->track_motion)
return TRUE;
}
}
g_signal_emit_by_name (widget, "drag-motion",
context, x, y, time, &retval);
return (site->flags & GTK_DEST_DEFAULT_MOTION) ? TRUE : retval;
}
static gboolean
gtk_drag_dest_drop (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint time)
{
GtkDragDestSite *site;
GtkDragDestInfo *info;
site = g_object_get_data (G_OBJECT (widget), "gtk-drag-dest");
g_return_val_if_fail (site != NULL, FALSE);
info = gtk_drag_get_dest_info (context, FALSE);
g_return_val_if_fail (info != NULL, FALSE);
info->drop_x = x;
info->drop_y = y;
if (site->do_proxy)
{
if (info->proxy_source ||
(info->context->protocol == GDK_DRAG_PROTO_ROOTWIN))
{
gtk_drag_drop (info->proxy_source, time);
}
else
{
/* We need to synthesize a motion event, wait for a status,
* and, if we get a good one, do a drop.
*/
GdkEvent *current_event;
GdkAtom selection;
GdkWindow *dest_window;
GdkDragProtocol proto;
gtk_drag_proxy_begin (widget, info, time);
info->proxy_drop_wait = TRUE;
info->proxy_drop_time = time;
current_event = gtk_get_current_event ();
if (site->proxy_window)
{
dest_window = site->proxy_window;
proto = site->proxy_protocol;
}
else
{
gdk_drag_find_window_for_screen (info->proxy_source->context,
NULL,
gdk_drawable_get_screen (current_event->dnd.window),
current_event->dnd.x_root,
current_event->dnd.y_root,
&dest_window, &proto);
}
gdk_drag_motion (info->proxy_source->context,
dest_window, proto,
current_event->dnd.x_root,
current_event->dnd.y_root,
context->suggested_action,
context->actions, time);
if (!site->proxy_window && dest_window)
g_object_unref (dest_window);
selection = gdk_drag_get_selection (info->proxy_source->context);
if (selection &&
selection != gdk_drag_get_selection (info->context))
gtk_drag_source_check_selection (info->proxy_source, selection, time);
gdk_event_free (current_event);
}
return TRUE;
}
else
{
gboolean retval;
if (site->flags & GTK_DEST_DEFAULT_DROP)
{
GdkAtom target = gtk_drag_dest_find_target (widget, context, NULL);
if (target == GDK_NONE)
{
gtk_drag_finish (context, FALSE, FALSE, time);
return TRUE;
}
else
gtk_drag_get_data (widget, context, target, time);
}
g_signal_emit_by_name (widget, "drag-drop",
context, x, y, time, &retval);
return (site->flags & GTK_DEST_DEFAULT_DROP) ? TRUE : retval;
}
}
/***************
* Source side *
***************/
/* Like GtkDragBegin, but also takes a GtkDragSourceSite,
* so that we can set the icon from the source site information
*/
static GdkDragContext *
gtk_drag_begin_internal (GtkWidget *widget,
GtkDragSourceSite *site,
GtkTargetList *target_list,
GdkDragAction actions,
gint button,
GdkEvent *event)
{
GtkDragSourceInfo *info;
GList *targets = NULL;
GList *tmp_list;
guint32 time = GDK_CURRENT_TIME;
GdkDragAction possible_actions, suggested_action;
GdkDragContext *context;
GtkWidget *ipc_widget;
GdkCursor *cursor;
ipc_widget = gtk_drag_get_ipc_widget (widget);
gtk_drag_get_event_actions (event, button, actions,
&suggested_action, &possible_actions);
cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
suggested_action,
NULL);
if (event)
time = gdk_event_get_time (event);
if (gdk_pointer_grab (ipc_widget->window, FALSE,
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK, NULL,
cursor, time) != GDK_GRAB_SUCCESS)
{
gtk_drag_release_ipc_widget (ipc_widget);
return NULL;
}
grab_dnd_keys (ipc_widget, time);
/* We use a GTK grab here to override any grabs that the widget
* we are dragging from might have held
*/
gtk_grab_add (ipc_widget);
tmp_list = g_list_last (target_list->list);
while (tmp_list)
{
GtkTargetPair *pair = tmp_list->data;
targets = g_list_prepend (targets,
GINT_TO_POINTER (pair->target));
tmp_list = tmp_list->prev;
}
source_widgets = g_slist_prepend (source_widgets, ipc_widget);
context = gdk_drag_begin (ipc_widget->window, targets);
g_list_free (targets);
info = gtk_drag_get_source_info (context, TRUE);
info->ipc_widget = ipc_widget;
g_object_set_data (G_OBJECT (info->ipc_widget), I_("gtk-info"), info);
info->widget = g_object_ref (widget);
info->button = button;
info->cursor = cursor;
info->target_list = target_list;
gtk_target_list_ref (target_list);
info->possible_actions = actions;
info->status = GTK_DRAG_STATUS_DRAG;
info->last_event = NULL;
info->selections = NULL;
info->icon_window = NULL;
info->destroy_icon = FALSE;
/* Set cur_x, cur_y here so if the "drag-begin" signal shows
* the drag icon, it will be in the right place
*/
if (event && event->type == GDK_MOTION_NOTIFY)
{
info->cur_screen = gtk_widget_get_screen (widget);
info->cur_x = event->motion.x_root;
info->cur_y = event->motion.y_root;
}
else
{
gdk_display_get_pointer (gtk_widget_get_display (widget),
&info->cur_screen, &info->cur_x, &info->cur_y, NULL);
}
g_signal_emit_by_name (widget, "drag-begin", info->context);
/* Ensure that we have an icon before we start the drag; the
* application may have set one in ::drag_begin, or it may
* not have set one.
*/
if (!info->icon_window && !info->icon_pixbuf)
{
if (!site || site->icon_type == GTK_IMAGE_EMPTY)
gtk_drag_set_icon_default (context);
else
switch (site->icon_type)
{
case GTK_IMAGE_PIXMAP:
gtk_drag_set_icon_pixmap (context,
site->colormap,
site->icon_data.pixmap.pixmap,
site->icon_mask,
-2, -2);
break;
case GTK_IMAGE_PIXBUF:
gtk_drag_set_icon_pixbuf (context,
site->icon_data.pixbuf.pixbuf,
-2, -2);
break;
case GTK_IMAGE_STOCK:
gtk_drag_set_icon_stock (context,
site->icon_data.stock.stock_id,
-2, -2);
break;
case GTK_IMAGE_ICON_NAME:
gtk_drag_set_icon_name (context,
site->icon_data.name.icon_name,
-2, -2);
break;
case GTK_IMAGE_EMPTY:
default:
g_assert_not_reached();
break;
}
}
/* We need to composite the icon into the cursor, if we are
* not using an icon window.
*/
if (info->icon_pixbuf)
{
cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
suggested_action,
info);
if (cursor != info->cursor)
{
gdk_pointer_grab (widget->window, FALSE,
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL,
cursor, time);
info->cursor = cursor;
}
}
if (event && event->type == GDK_MOTION_NOTIFY)
gtk_drag_motion_cb (info->ipc_widget, (GdkEventMotion *)event, info);
else
gtk_drag_update (info, info->cur_screen, info->cur_x, info->cur_y, event);
info->start_x = info->cur_x;
info->start_y = info->cur_y;
g_signal_connect (info->ipc_widget, "grab-broken-event",
G_CALLBACK (gtk_drag_grab_broken_event_cb), info);
g_signal_connect (info->ipc_widget, "grab-notify",
G_CALLBACK (gtk_drag_grab_notify_cb), info);
g_signal_connect (info->ipc_widget, "button-release-event",
G_CALLBACK (gtk_drag_button_release_cb), info);
g_signal_connect (info->ipc_widget, "motion-notify-event",
G_CALLBACK (gtk_drag_motion_cb), info);
g_signal_connect (info->ipc_widget, "key-press-event",
G_CALLBACK (gtk_drag_key_cb), info);
g_signal_connect (info->ipc_widget, "key-release-event",
G_CALLBACK (gtk_drag_key_cb), info);
g_signal_connect (info->ipc_widget, "selection-get",
G_CALLBACK (gtk_drag_selection_get), info);
info->have_grab = TRUE;
info->grab_time = time;
return info->context;
}
/**
* gtk_drag_begin:
* @widget: the source widget.
* @targets: The targets (data formats) in which the
* source can provide the data.
* @actions: A bitmask of the allowed drag actions for this drag.
* @button: The button the user clicked to start the drag.
* @event: The event that triggered the start of the drag.
*
* Initiates a drag on the source side. The function
* only needs to be used when the application is
* starting drags itself, and is not needed when
* gtk_drag_source_set() is used.
*
* Return value: the context for this drag.
**/
GdkDragContext *
gtk_drag_begin (GtkWidget *widget,
GtkTargetList *targets,
GdkDragAction actions,
gint button,
GdkEvent *event)
{
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
g_return_val_if_fail (gtk_widget_get_realized (widget), NULL);
g_return_val_if_fail (targets != NULL, NULL);
return gtk_drag_begin_internal (widget, NULL, targets,
actions, button, event);
}
/**
* gtk_drag_source_set:
* @widget: a #GtkWidget
* @start_button_mask: the bitmask of buttons that can start the drag
* @targets: (allow-none) (array length=n_targets): the table of targets that the drag will support,
* may be %NULL
* @n_targets: the number of items in @targets
* @actions: the bitmask of possible actions for a drag from this widget
*
* Sets up a widget so that GTK+ will start a drag operation when the user
* clicks and drags on the widget. The widget must have a window.
*/
void
gtk_drag_source_set (GtkWidget *widget,
GdkModifierType start_button_mask,
const GtkTargetEntry *targets,
gint n_targets,
GdkDragAction actions)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
gtk_widget_add_events (widget,
gtk_widget_get_events (widget) |
GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_MOTION_MASK);
if (site)
{
if (site->target_list)
gtk_target_list_unref (site->target_list);
}
else
{
site = g_new0 (GtkDragSourceSite, 1);
site->icon_type = GTK_IMAGE_EMPTY;
g_signal_connect (widget, "button-press-event",
G_CALLBACK (gtk_drag_source_event_cb),
site);
g_signal_connect (widget, "button-release-event",
G_CALLBACK (gtk_drag_source_event_cb),
site);
g_signal_connect (widget, "motion-notify-event",
G_CALLBACK (gtk_drag_source_event_cb),
site);
g_object_set_data_full (G_OBJECT (widget),
I_("gtk-site-data"),
site, gtk_drag_source_site_destroy);
}
site->start_button_mask = start_button_mask;
site->target_list = gtk_target_list_new (targets, n_targets);
site->actions = actions;
}
/*************************************************************
* gtk_drag_source_unset
* Unregister this widget as a drag source.
* arguments:
* widget:
* results:
*************************************************************/
void
gtk_drag_source_unset (GtkWidget *widget)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
if (site)
{
g_signal_handlers_disconnect_by_func (widget,
gtk_drag_source_event_cb,
site);
g_object_set_data (G_OBJECT (widget), I_("gtk-site-data"), NULL);
}
}
/**
* gtk_drag_source_get_target_list:
* @widget: a #GtkWidget
*
* Gets the list of targets this widget can provide for
* drag-and-drop.
*
* Return value: the #GtkTargetList, or %NULL if none
*
* Since: 2.4
**/
GtkTargetList *
gtk_drag_source_get_target_list (GtkWidget *widget)
{
GtkDragSourceSite *site;
g_return_val_if_fail (GTK_IS_WIDGET (widget), NULL);
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
return site ? site->target_list : NULL;
}
/**
* gtk_drag_source_set_target_list:
* @widget: a #GtkWidget that's a drag source
* @target_list: (allow-none): list of draggable targets, or %NULL for none
*
* Changes the target types that this widget offers for drag-and-drop.
* The widget must first be made into a drag source with
* gtk_drag_source_set().
*
* Since: 2.4
**/
void
gtk_drag_source_set_target_list (GtkWidget *widget,
GtkTargetList *target_list)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
if (site == NULL)
{
g_warning ("gtk_drag_source_set_target_list() requires the widget "
"to already be a drag source.");
return;
}
if (target_list)
gtk_target_list_ref (target_list);
if (site->target_list)
gtk_target_list_unref (site->target_list);
site->target_list = target_list;
}
/**
* gtk_drag_source_add_text_targets:
* @widget: a #GtkWidget that's is a drag source
*
* Add the text targets supported by #GtkSelection to
* the target list of the drag source. The targets
* are added with @info = 0. If you need another value,
* use gtk_target_list_add_text_targets() and
* gtk_drag_source_set_target_list().
*
* Since: 2.6
**/
void
gtk_drag_source_add_text_targets (GtkWidget *widget)
{
GtkTargetList *target_list;
target_list = gtk_drag_source_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_text_targets (target_list, 0);
gtk_drag_source_set_target_list (widget, target_list);
gtk_target_list_unref (target_list);
}
/**
* gtk_drag_source_add_image_targets:
* @widget: a #GtkWidget that's is a drag source
*
* Add the writable image targets supported by #GtkSelection to
* the target list of the drag source. The targets
* are added with @info = 0. If you need another value,
* use gtk_target_list_add_image_targets() and
* gtk_drag_source_set_target_list().
*
* Since: 2.6
**/
void
gtk_drag_source_add_image_targets (GtkWidget *widget)
{
GtkTargetList *target_list;
target_list = gtk_drag_source_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_image_targets (target_list, 0, TRUE);
gtk_drag_source_set_target_list (widget, target_list);
gtk_target_list_unref (target_list);
}
/**
* gtk_drag_source_add_uri_targets:
* @widget: a #GtkWidget that's is a drag source
*
* Add the URI targets supported by #GtkSelection to
* the target list of the drag source. The targets
* are added with @info = 0. If you need another value,
* use gtk_target_list_add_uri_targets() and
* gtk_drag_source_set_target_list().
*
* Since: 2.6
**/
void
gtk_drag_source_add_uri_targets (GtkWidget *widget)
{
GtkTargetList *target_list;
target_list = gtk_drag_source_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_source_set_target_list (widget, target_list);
gtk_target_list_unref (target_list);
}
static void
gtk_drag_source_unset_icon (GtkDragSourceSite *site)
{
switch (site->icon_type)
{
case GTK_IMAGE_EMPTY:
break;
case GTK_IMAGE_PIXMAP:
if (site->icon_data.pixmap.pixmap)
g_object_unref (site->icon_data.pixmap.pixmap);
if (site->icon_mask)
g_object_unref (site->icon_mask);
break;
case GTK_IMAGE_PIXBUF:
g_object_unref (site->icon_data.pixbuf.pixbuf);
break;
case GTK_IMAGE_STOCK:
g_free (site->icon_data.stock.stock_id);
break;
case GTK_IMAGE_ICON_NAME:
g_free (site->icon_data.name.icon_name);
break;
default:
g_assert_not_reached();
break;
}
site->icon_type = GTK_IMAGE_EMPTY;
if (site->colormap)
g_object_unref (site->colormap);
site->colormap = NULL;
}
/**
* gtk_drag_source_set_icon:
* @widget: a #GtkWidget
* @colormap: the colormap of the icon
* @pixmap: the image data for the icon
* @mask: (allow-none): the transparency mask for an image.
*
* Sets the icon that will be used for drags from a particular widget
* from a pixmap/mask. GTK+ retains references for the arguments, and
* will release them when they are no longer needed.
* Use gtk_drag_source_set_icon_pixbuf() instead.
**/
void
gtk_drag_source_set_icon (GtkWidget *widget,
GdkColormap *colormap,
GdkPixmap *pixmap,
GdkBitmap *mask)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_COLORMAP (colormap));
g_return_if_fail (GDK_IS_PIXMAP (pixmap));
g_return_if_fail (!mask || GDK_IS_PIXMAP (mask));
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
g_return_if_fail (site != NULL);
g_object_ref (colormap);
g_object_ref (pixmap);
if (mask)
g_object_ref (mask);
gtk_drag_source_unset_icon (site);
site->icon_type = GTK_IMAGE_PIXMAP;
site->icon_data.pixmap.pixmap = pixmap;
site->icon_mask = mask;
site->colormap = colormap;
}
/**
* gtk_drag_source_set_icon_pixbuf:
* @widget: a #GtkWidget
* @pixbuf: the #GdkPixbuf for the drag icon
*
* Sets the icon that will be used for drags from a particular widget
* from a #GdkPixbuf. GTK+ retains a reference for @pixbuf and will
* release it when it is no longer needed.
**/
void
gtk_drag_source_set_icon_pixbuf (GtkWidget *widget,
GdkPixbuf *pixbuf)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
g_return_if_fail (site != NULL);
g_object_ref (pixbuf);
gtk_drag_source_unset_icon (site);
site->icon_type = GTK_IMAGE_PIXBUF;
site->icon_data.pixbuf.pixbuf = pixbuf;
}
/**
* gtk_drag_source_set_icon_stock:
* @widget: a #GtkWidget
* @stock_id: the ID of the stock icon to use
*
* Sets the icon that will be used for drags from a particular source
* to a stock icon.
**/
void
gtk_drag_source_set_icon_stock (GtkWidget *widget,
const gchar *stock_id)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (stock_id != NULL);
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
g_return_if_fail (site != NULL);
gtk_drag_source_unset_icon (site);
site->icon_type = GTK_IMAGE_STOCK;
site->icon_data.stock.stock_id = g_strdup (stock_id);
}
/**
* gtk_drag_source_set_icon_name:
* @widget: a #GtkWidget
* @icon_name: name of icon to use
*
* Sets the icon that will be used for drags from a particular source
* to a themed icon. See the docs for #GtkIconTheme for more details.
*
* Since: 2.8
**/
void
gtk_drag_source_set_icon_name (GtkWidget *widget,
const gchar *icon_name)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (icon_name != NULL);
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
g_return_if_fail (site != NULL);
gtk_drag_source_unset_icon (site);
site->icon_type = GTK_IMAGE_ICON_NAME;
site->icon_data.name.icon_name = g_strdup (icon_name);
}
static void
gtk_drag_get_icon (GtkDragSourceInfo *info,
GtkWidget **icon_window,
gint *hot_x,
gint *hot_y)
{
if (get_can_change_screen (info->icon_window))
gtk_window_set_screen (GTK_WINDOW (info->icon_window),
info->cur_screen);
if (gtk_widget_get_screen (info->icon_window) != info->cur_screen)
{
if (!info->fallback_icon)
{
gint save_hot_x, save_hot_y;
gboolean save_destroy_icon;
GtkWidget *save_icon_window;
/* HACK to get the appropriate icon
*/
save_icon_window = info->icon_window;
save_hot_x = info->hot_x;
save_hot_y = info->hot_x;
save_destroy_icon = info->destroy_icon;
info->icon_window = NULL;
if (!default_icon_pixmap)
set_icon_stock_pixbuf (info->context,
GTK_STOCK_DND, NULL, -2, -2, TRUE);
else
gtk_drag_set_icon_pixmap (info->context,
default_icon_colormap,
default_icon_pixmap,
default_icon_mask,
default_icon_hot_x,
default_icon_hot_y);
info->fallback_icon = info->icon_window;
info->icon_window = save_icon_window;
info->hot_x = save_hot_x;
info->hot_y = save_hot_y;
info->destroy_icon = save_destroy_icon;
}
gtk_widget_hide (info->icon_window);
*icon_window = info->fallback_icon;
gtk_window_set_screen (GTK_WINDOW (*icon_window), info->cur_screen);
if (!default_icon_pixmap)
{
*hot_x = -2;
*hot_y = -2;
}
else
{
*hot_x = default_icon_hot_x;
*hot_y = default_icon_hot_y;
}
}
else
{
if (info->fallback_icon)
gtk_widget_hide (info->fallback_icon);
*icon_window = info->icon_window;
*hot_x = info->hot_x;
*hot_y = info->hot_y;
}
}
static void
gtk_drag_update_icon (GtkDragSourceInfo *info)
{
if (info->icon_window)
{
GtkWidget *icon_window;
gint hot_x, hot_y;
gtk_drag_get_icon (info, &icon_window, &hot_x, &hot_y);
gtk_window_move (GTK_WINDOW (icon_window),
info->cur_x - hot_x,
info->cur_y - hot_y);
if (gtk_widget_get_visible (icon_window))
gdk_window_raise (icon_window->window);
else
gtk_widget_show (icon_window);
}
}
static void
gtk_drag_set_icon_window (GdkDragContext *context,
GtkWidget *widget,
gint hot_x,
gint hot_y,
gboolean destroy_on_release)
{
GtkDragSourceInfo *info;
info = gtk_drag_get_source_info (context, FALSE);
if (info == NULL)
{
if (destroy_on_release)
gtk_widget_destroy (widget);
return;
}
gtk_drag_remove_icon (info);
if (widget)
g_object_ref (widget);
info->icon_window = widget;
info->hot_x = hot_x;
info->hot_y = hot_y;
info->destroy_icon = destroy_on_release;
if (widget && info->icon_pixbuf)
{
g_object_unref (info->icon_pixbuf);
info->icon_pixbuf = NULL;
}
gtk_drag_update_cursor (info);
gtk_drag_update_icon (info);
}
/**
* gtk_drag_set_icon_widget:
* @context: the context for a drag. (This must be called
with a context for the source side of a drag)
* @widget: a toplevel window to use as an icon.
* @hot_x: the X offset within @widget of the hotspot.
* @hot_y: the Y offset within @widget of the hotspot.
*
* Changes the icon for a widget to a given widget. GTK+
* will not destroy the icon, so if you don't want
* it to persist, you should connect to the "drag-end"
* signal and destroy it yourself.
**/
void
gtk_drag_set_icon_widget (GdkDragContext *context,
GtkWidget *widget,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->is_source);
g_return_if_fail (GTK_IS_WIDGET (widget));
gtk_drag_set_icon_window (context, widget, hot_x, hot_y, FALSE);
}
static void
icon_window_realize (GtkWidget *window,
GdkPixbuf *pixbuf)
{
GdkPixmap *pixmap;
GdkPixmap *mask;
gdk_pixbuf_render_pixmap_and_mask_for_colormap (pixbuf,
gtk_widget_get_colormap (window),
&pixmap, &mask, 128);
gdk_window_set_back_pixmap (window->window, pixmap, FALSE);
g_object_unref (pixmap);
if (mask)
{
gtk_widget_shape_combine_mask (window, mask, 0, 0);
g_object_unref (mask);
}
}
static void
set_icon_stock_pixbuf (GdkDragContext *context,
const gchar *stock_id,
GdkPixbuf *pixbuf,
gint hot_x,
gint hot_y,
gboolean force_window)
{
GtkWidget *window;
gint width, height;
GdkScreen *screen;
GdkDisplay *display;
g_return_if_fail (context != NULL);
g_return_if_fail (pixbuf != NULL || stock_id != NULL);
g_return_if_fail (pixbuf == NULL || stock_id == NULL);
screen = gdk_drawable_get_screen (context->source_window);
/* Push a NULL colormap to guard against gtk_widget_push_colormap() */
gtk_widget_push_colormap (NULL);
window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
gtk_window_set_screen (GTK_WINDOW (window), screen);
set_can_change_screen (window, TRUE);
gtk_widget_pop_colormap ();
gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_set_app_paintable (window, TRUE);
if (stock_id)
{
pixbuf = gtk_widget_render_icon (window, stock_id,
GTK_ICON_SIZE_DND, NULL);
if (!pixbuf)
{
g_warning ("Cannot load drag icon from stock_id %s", stock_id);
gtk_widget_destroy (window);
return;
}
}
else
g_object_ref (pixbuf);
display = gdk_drawable_get_display (context->source_window);
width = gdk_pixbuf_get_width (pixbuf);
height = gdk_pixbuf_get_height (pixbuf);
if (!force_window &&
gtk_drag_can_use_rgba_cursor (display, width + 2, height + 2))
{
GtkDragSourceInfo *info;
gtk_widget_destroy (window);
info = gtk_drag_get_source_info (context, FALSE);
if (info->icon_pixbuf)
g_object_unref (info->icon_pixbuf);
info->icon_pixbuf = pixbuf;
gtk_drag_set_icon_window (context, NULL, hot_x, hot_y, TRUE);
}
else
{
gtk_widget_set_size_request (window, width, height);
g_signal_connect_closure (window, "realize",
g_cclosure_new (G_CALLBACK (icon_window_realize),
pixbuf,
(GClosureNotify)g_object_unref),
FALSE);
gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE);
}
}
/**
* gtk_drag_set_icon_pixbuf:
* @context: the context for a drag. (This must be called
* with a context for the source side of a drag)
* @pixbuf: the #GdkPixbuf to use as the drag icon.
* @hot_x: the X offset within @widget of the hotspot.
* @hot_y: the Y offset within @widget of the hotspot.
*
* Sets @pixbuf as the icon for a given drag.
**/
void
gtk_drag_set_icon_pixbuf (GdkDragContext *context,
GdkPixbuf *pixbuf,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->is_source);
g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y, FALSE);
}
/**
* gtk_drag_set_icon_stock:
* @context: the context for a drag. (This must be called
* with a context for the source side of a drag)
* @stock_id: the ID of the stock icon to use for the drag.
* @hot_x: the X offset within the icon of the hotspot.
* @hot_y: the Y offset within the icon of the hotspot.
*
* Sets the icon for a given drag from a stock ID.
**/
void
gtk_drag_set_icon_stock (GdkDragContext *context,
const gchar *stock_id,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->is_source);
g_return_if_fail (stock_id != NULL);
set_icon_stock_pixbuf (context, stock_id, NULL, hot_x, hot_y, FALSE);
}
/**
* gtk_drag_set_icon_pixmap:
* @context: the context for a drag. (This must be called
* with a context for the source side of a drag)
* @colormap: the colormap of the icon
* @pixmap: the image data for the icon
* @mask: (allow-none): the transparency mask for the icon or %NULL for none.
* @hot_x: the X offset within @pixmap of the hotspot.
* @hot_y: the Y offset within @pixmap of the hotspot.
*
* Sets @pixmap as the icon for a given drag. GTK+ retains
* references for the arguments, and will release them when
* they are no longer needed. In general, gtk_drag_set_icon_pixbuf()
* will be more convenient to use.
**/
void
gtk_drag_set_icon_pixmap (GdkDragContext *context,
GdkColormap *colormap,
GdkPixmap *pixmap,
GdkBitmap *mask,
gint hot_x,
gint hot_y)
{
GtkWidget *window;
GdkScreen *screen;
gint width, height;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->is_source);
g_return_if_fail (GDK_IS_COLORMAP (colormap));
g_return_if_fail (GDK_IS_PIXMAP (pixmap));
g_return_if_fail (!mask || GDK_IS_PIXMAP (mask));
screen = gdk_colormap_get_screen (colormap);
g_return_if_fail (gdk_drawable_get_screen (pixmap) == screen);
g_return_if_fail (!mask || gdk_drawable_get_screen (mask) == screen);
gdk_drawable_get_size (pixmap, &width, &height);
gtk_widget_push_colormap (colormap);
window = gtk_window_new (GTK_WINDOW_POPUP);
gtk_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
gtk_window_set_screen (GTK_WINDOW (window), screen);
set_can_change_screen (window, FALSE);
gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_set_app_paintable (GTK_WIDGET (window), TRUE);
gtk_widget_pop_colormap ();
gtk_widget_set_size_request (window, width, height);
gtk_widget_realize (window);
gdk_window_set_back_pixmap (window->window, pixmap, FALSE);
if (mask)
gtk_widget_shape_combine_mask (window, mask, 0, 0);
gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE);
}
/**
* gtk_drag_set_icon_name:
* @context: the context for a drag. (This must be called
* with a context for the source side of a drag)
* @icon_name: name of icon to use
* @hot_x: the X offset of the hotspot within the icon
* @hot_y: the Y offset of the hotspot within the icon
*
* Sets the icon for a given drag from a named themed icon. See
* the docs for #GtkIconTheme for more details. Note that the
* size of the icon depends on the icon theme (the icon is
* loaded at the symbolic size #GTK_ICON_SIZE_DND), thus
* @hot_x and @hot_y have to be used with care.
*
* Since: 2.8
**/
void
gtk_drag_set_icon_name (GdkDragContext *context,
const gchar *icon_name,
gint hot_x,
gint hot_y)
{
GdkScreen *screen;
GtkSettings *settings;
GtkIconTheme *icon_theme;
GdkPixbuf *pixbuf;
gint width, height, icon_size;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->is_source);
g_return_if_fail (icon_name != NULL);
screen = gdk_drawable_get_screen (context->source_window);
g_return_if_fail (screen != NULL);
settings = gtk_settings_get_for_screen (screen);
if (gtk_icon_size_lookup_for_settings (settings,
GTK_ICON_SIZE_DND,
&width, &height))
icon_size = MAX (width, height);
else
icon_size = 32; /* default value for GTK_ICON_SIZE_DND */
icon_theme = gtk_icon_theme_get_for_screen (screen);
pixbuf = gtk_icon_theme_load_icon (icon_theme, icon_name,
icon_size, 0, NULL);
if (pixbuf)
set_icon_stock_pixbuf (context, NULL, pixbuf, hot_x, hot_y, FALSE);
else
g_warning ("Cannot load drag icon from icon name %s", icon_name);
}
/**
* gtk_drag_set_icon_default:
* @context: the context for a drag. (This must be called
with a context for the source side of a drag)
*
* Sets the icon for a particular drag to the default
* icon.
**/
void
gtk_drag_set_icon_default (GdkDragContext *context)
{
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (context->is_source);
if (!default_icon_pixmap)
gtk_drag_set_icon_stock (context, GTK_STOCK_DND, -2, -2);
else
gtk_drag_set_icon_pixmap (context,
default_icon_colormap,
default_icon_pixmap,
default_icon_mask,
default_icon_hot_x,
default_icon_hot_y);
}
/**
* gtk_drag_set_default_icon:
* @colormap: the colormap of the icon
* @pixmap: the image data for the icon
* @mask: (allow-none): the transparency mask for an image, or %NULL
* @hot_x: The X offset within @widget of the hotspot.
* @hot_y: The Y offset within @widget of the hotspot.
*
* Changes the default drag icon. GTK+ retains references for the
* arguments, and will release them when they are no longer needed.
*
* Deprecated: Change the default drag icon via the stock system by
* changing the stock pixbuf for #GTK_STOCK_DND instead.
**/
void
gtk_drag_set_default_icon (GdkColormap *colormap,
GdkPixmap *pixmap,
GdkBitmap *mask,
gint hot_x,
gint hot_y)
{
g_return_if_fail (GDK_IS_COLORMAP (colormap));
g_return_if_fail (GDK_IS_PIXMAP (pixmap));
g_return_if_fail (!mask || GDK_IS_PIXMAP (mask));
if (default_icon_colormap)
g_object_unref (default_icon_colormap);
if (default_icon_pixmap)
g_object_unref (default_icon_pixmap);
if (default_icon_mask)
g_object_unref (default_icon_mask);
default_icon_colormap = colormap;
g_object_ref (colormap);
default_icon_pixmap = pixmap;
g_object_ref (pixmap);
default_icon_mask = mask;
if (mask)
g_object_ref (mask);
default_icon_hot_x = hot_x;
default_icon_hot_y = hot_y;
}
/*************************************************************
* _gtk_drag_source_handle_event:
* Called from widget event handling code on Drag events
* for drag sources.
*
* arguments:
* toplevel: Toplevel widget that received the event
* event:
* results:
*************************************************************/
void
_gtk_drag_source_handle_event (GtkWidget *widget,
GdkEvent *event)
{
GtkDragSourceInfo *info;
GdkDragContext *context;
g_return_if_fail (widget != NULL);
g_return_if_fail (event != NULL);
context = event->dnd.context;
info = gtk_drag_get_source_info (context, FALSE);
if (!info)
return;
switch (event->type)
{
case GDK_DRAG_STATUS:
{
GdkCursor *cursor;
if (info->proxy_dest)
{
if (!event->dnd.send_event)
{
if (info->proxy_dest->proxy_drop_wait)
{
gboolean result = context->action != 0;
/* Aha - we can finally pass the MOTIF DROP on... */
gdk_drop_reply (info->proxy_dest->context, result, info->proxy_dest->proxy_drop_time);
if (result)
gdk_drag_drop (info->context, info->proxy_dest->proxy_drop_time);
else
gtk_drag_finish (info->proxy_dest->context, FALSE, FALSE, info->proxy_dest->proxy_drop_time);
}
else
{
gdk_drag_status (info->proxy_dest->context,
event->dnd.context->action,
event->dnd.time);
}
}
}
else if (info->have_grab)
{
cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
event->dnd.context->action,
info);
if (info->cursor != cursor)
{
gdk_pointer_grab (widget->window, FALSE,
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
NULL,
cursor, info->grab_time);
info->cursor = cursor;
}
gtk_drag_add_update_idle (info);
}
}
break;
case GDK_DROP_FINISHED:
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_SUCCESS, event->dnd.time);
break;
default:
g_assert_not_reached ();
}
}
/*************************************************************
* gtk_drag_source_check_selection:
* Check if we've set up handlers/claimed the selection
* for a given drag. If not, add them.
* arguments:
*
* results:
*************************************************************/
static void
gtk_drag_source_check_selection (GtkDragSourceInfo *info,
GdkAtom selection,
guint32 time)
{
GList *tmp_list;
tmp_list = info->selections;
while (tmp_list)
{
if (GDK_POINTER_TO_ATOM (tmp_list->data) == selection)
return;
tmp_list = tmp_list->next;
}
gtk_selection_owner_set_for_display (gtk_widget_get_display (info->widget),
info->ipc_widget,
selection,
time);
info->selections = g_list_prepend (info->selections,
GUINT_TO_POINTER (selection));
tmp_list = info->target_list->list;
while (tmp_list)
{
GtkTargetPair *pair = tmp_list->data;
gtk_selection_add_target (info->ipc_widget,
selection,
pair->target,
pair->info);
tmp_list = tmp_list->next;
}
if (info->context->protocol == GDK_DRAG_PROTO_MOTIF)
{
gtk_selection_add_target (info->ipc_widget,
selection,
gdk_atom_intern_static_string ("XmTRANSFER_SUCCESS"),
TARGET_MOTIF_SUCCESS);
gtk_selection_add_target (info->ipc_widget,
selection,
gdk_atom_intern_static_string ("XmTRANSFER_FAILURE"),
TARGET_MOTIF_FAILURE);
}
gtk_selection_add_target (info->ipc_widget,
selection,
gdk_atom_intern_static_string ("DELETE"),
TARGET_DELETE);
}
/*************************************************************
* gtk_drag_drop_finished:
* Clean up from the drag, and display snapback, if necessary.
* arguments:
* info:
* success:
* time:
* results:
*************************************************************/
static void
gtk_drag_drop_finished (GtkDragSourceInfo *info,
GtkDragResult result,
guint time)
{
gboolean success;
success = (result == GTK_DRAG_RESULT_SUCCESS);
gtk_drag_source_release_selections (info, time);
if (info->proxy_dest)
{
/* The time from the event isn't reliable for Xdnd drags */
gtk_drag_finish (info->proxy_dest->context, success, FALSE,
info->proxy_dest->proxy_drop_time);
gtk_drag_source_info_destroy (info);
}
else
{
if (!success)
g_signal_emit_by_name (info->widget, "drag-failed",
info->context, result, &success);
if (success)
{
gtk_drag_source_info_destroy (info);
}
else
{
GtkDragAnim *anim = g_new (GtkDragAnim, 1);
anim->info = info;
anim->step = 0;
anim->n_steps = MAX (info->cur_x - info->start_x,
info->cur_y - info->start_y) / ANIM_STEP_LENGTH;
anim->n_steps = CLAMP (anim->n_steps, ANIM_MIN_STEPS, ANIM_MAX_STEPS);
info->cur_screen = gtk_widget_get_screen (info->widget);
if (!info->icon_window)
set_icon_stock_pixbuf (info->context, NULL, info->icon_pixbuf,
0, 0, TRUE);
gtk_drag_update_icon (info);
/* Mark the context as dead, so if the destination decides
* to respond really late, we still are OK.
*/
gtk_drag_clear_source_info (info->context);
gdk_threads_add_timeout (ANIM_STEP_TIME, gtk_drag_anim_timeout, anim);
}
}
}
static void
gtk_drag_source_release_selections (GtkDragSourceInfo *info,
guint32 time)
{
GdkDisplay *display = gtk_widget_get_display (info->widget);
GList *tmp_list = info->selections;
while (tmp_list)
{
GdkAtom selection = GDK_POINTER_TO_ATOM (tmp_list->data);
if (gdk_selection_owner_get_for_display (display, selection) == info->ipc_widget->window)
gtk_selection_owner_set_for_display (display, NULL, selection, time);
tmp_list = tmp_list->next;
}
g_list_free (info->selections);
info->selections = NULL;
}
/*************************************************************
* gtk_drag_drop:
* Send a drop event.
* arguments:
*
* results:
*************************************************************/
static void
gtk_drag_drop (GtkDragSourceInfo *info,
guint32 time)
{
if (info->context->protocol == GDK_DRAG_PROTO_ROOTWIN)
{
GtkSelectionData selection_data;
GList *tmp_list;
/* GTK+ traditionally has used application/x-rootwin-drop, but the
* XDND spec specifies x-rootwindow-drop.
*/
GdkAtom target1 = gdk_atom_intern_static_string ("application/x-rootwindow-drop");
GdkAtom target2 = gdk_atom_intern_static_string ("application/x-rootwin-drop");
tmp_list = info->target_list->list;
while (tmp_list)
{
GtkTargetPair *pair = tmp_list->data;
if (pair->target == target1 || pair->target == target2)
{
selection_data.selection = GDK_NONE;
selection_data.target = pair->target;
selection_data.data = NULL;
selection_data.length = -1;
g_signal_emit_by_name (info->widget, "drag-data-get",
info->context, &selection_data,
pair->info,
time);
/* FIXME: Should we check for length >= 0 here? */
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_SUCCESS, time);
return;
}
tmp_list = tmp_list->next;
}
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_NO_TARGET, time);
}
else
{
if (info->icon_window)
gtk_widget_hide (info->icon_window);
gdk_drag_drop (info->context, time);
info->drop_timeout = gdk_threads_add_timeout (DROP_ABORT_TIME,
gtk_drag_abort_timeout,
info);
}
}
/*
* Source side callbacks.
*/
static gboolean
gtk_drag_source_event_cb (GtkWidget *widget,
GdkEvent *event,
gpointer data)
{
GtkDragSourceSite *site;
gboolean retval = FALSE;
site = (GtkDragSourceSite *)data;
switch (event->type)
{
case GDK_BUTTON_PRESS:
if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
{
site->state |= (GDK_BUTTON1_MASK << (event->button.button - 1));
site->x = event->button.x;
site->y = event->button.y;
}
break;
case GDK_BUTTON_RELEASE:
if ((GDK_BUTTON1_MASK << (event->button.button - 1)) & site->start_button_mask)
site->state &= ~(GDK_BUTTON1_MASK << (event->button.button - 1));
break;
case GDK_MOTION_NOTIFY:
if (site->state & event->motion.state & site->start_button_mask)
{
/* FIXME: This is really broken and can leave us
* with a stuck grab
*/
int i;
for (i=1; i<6; i++)
{
if (site->state & event->motion.state &
GDK_BUTTON1_MASK << (i - 1))
break;
}
if (gtk_drag_check_threshold (widget, site->x, site->y,
event->motion.x, event->motion.y))
{
site->state = 0;
gtk_drag_begin_internal (widget, site, site->target_list,
site->actions,
i, event);
retval = TRUE;
}
}
break;
default: /* hit for 2/3BUTTON_PRESS */
break;
}
return retval;
}
static void
gtk_drag_source_site_destroy (gpointer data)
{
GtkDragSourceSite *site = data;
if (site->target_list)
gtk_target_list_unref (site->target_list);
gtk_drag_source_unset_icon (site);
g_free (site);
}
static void
gtk_drag_selection_get (GtkWidget *widget,
GtkSelectionData *selection_data,
guint sel_info,
guint32 time,
gpointer data)
{
GtkDragSourceInfo *info = data;
static GdkAtom null_atom = GDK_NONE;
guint target_info;
if (!null_atom)
null_atom = gdk_atom_intern_static_string ("NULL");
switch (sel_info)
{
case TARGET_DELETE:
g_signal_emit_by_name (info->widget,
"drag-data-delete",
info->context);
gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0);
break;
case TARGET_MOTIF_SUCCESS:
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_SUCCESS, time);
gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0);
break;
case TARGET_MOTIF_FAILURE:
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_NO_TARGET, time);
gtk_selection_data_set (selection_data, null_atom, 8, NULL, 0);
break;
default:
if (info->proxy_dest)
{
/* This is sort of dangerous and needs to be thought
* through better
*/
info->proxy_dest->proxy_data = selection_data;
gtk_drag_get_data (info->widget,
info->proxy_dest->context,
selection_data->target,
time);
gtk_main ();
info->proxy_dest->proxy_data = NULL;
}
else
{
if (gtk_target_list_find (info->target_list,
selection_data->target,
&target_info))
{
g_signal_emit_by_name (info->widget, "drag-data-get",
info->context,
selection_data,
target_info,
time);
}
}
break;
}
}
static gboolean
gtk_drag_anim_timeout (gpointer data)
{
GtkDragAnim *anim = data;
gint x, y;
gboolean retval;
if (anim->step == anim->n_steps)
{
gtk_drag_source_info_destroy (anim->info);
g_free (anim);
retval = FALSE;
}
else
{
x = (anim->info->start_x * (anim->step + 1) +
anim->info->cur_x * (anim->n_steps - anim->step - 1)) / anim->n_steps;
y = (anim->info->start_y * (anim->step + 1) +
anim->info->cur_y * (anim->n_steps - anim->step - 1)) / anim->n_steps;
if (anim->info->icon_window)
{
GtkWidget *icon_window;
gint hot_x, hot_y;
gtk_drag_get_icon (anim->info, &icon_window, &hot_x, &hot_y);
gtk_window_move (GTK_WINDOW (icon_window),
x - hot_x,
y - hot_y);
}
anim->step++;
retval = TRUE;
}
return retval;
}
static void
gtk_drag_remove_icon (GtkDragSourceInfo *info)
{
if (info->icon_window)
{
gtk_widget_hide (info->icon_window);
if (info->destroy_icon)
gtk_widget_destroy (info->icon_window);
if (info->fallback_icon)
{
gtk_widget_destroy (info->fallback_icon);
info->fallback_icon = NULL;
}
g_object_unref (info->icon_window);
info->icon_window = NULL;
}
}
static void
gtk_drag_source_info_destroy (GtkDragSourceInfo *info)
{
gint i;
for (i = 0; i < n_drag_cursors; i++)
{
if (info->drag_cursors[i] != NULL)
{
gdk_cursor_unref (info->drag_cursors[i]);
info->drag_cursors[i] = NULL;
}
}
gtk_drag_remove_icon (info);
if (info->icon_pixbuf)
{
g_object_unref (info->icon_pixbuf);
info->icon_pixbuf = NULL;
}
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_grab_broken_event_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_grab_notify_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_button_release_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_motion_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_key_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_selection_get,
info);
if (!info->proxy_dest)
g_signal_emit_by_name (info->widget, "drag-end", info->context);
if (info->widget)
g_object_unref (info->widget);
gtk_selection_remove_all (info->ipc_widget);
g_object_set_data (G_OBJECT (info->ipc_widget), I_("gtk-info"), NULL);
source_widgets = g_slist_remove (source_widgets, info->ipc_widget);
gtk_drag_release_ipc_widget (info->ipc_widget);
gtk_target_list_unref (info->target_list);
gtk_drag_clear_source_info (info->context);
g_object_unref (info->context);
if (info->drop_timeout)
g_source_remove (info->drop_timeout);
if (info->update_idle)
g_source_remove (info->update_idle);
g_free (info);
}
static gboolean
gtk_drag_update_idle (gpointer data)
{
GtkDragSourceInfo *info = data;
GdkWindow *dest_window;
GdkDragProtocol protocol;
GdkAtom selection;
GdkDragAction action;
GdkDragAction possible_actions;
guint32 time;
info->update_idle = 0;
if (info->last_event)
{
time = gtk_drag_get_event_time (info->last_event);
gtk_drag_get_event_actions (info->last_event,
info->button,
info->possible_actions,
&action, &possible_actions);
gtk_drag_update_icon (info);
gdk_drag_find_window_for_screen (info->context,
info->icon_window ? info->icon_window->window : NULL,
info->cur_screen, info->cur_x, info->cur_y,
&dest_window, &protocol);
if (!gdk_drag_motion (info->context, dest_window, protocol,
info->cur_x, info->cur_y, action,
possible_actions,
time))
{
gdk_event_free ((GdkEvent *)info->last_event);
info->last_event = NULL;
}
if (dest_window)
g_object_unref (dest_window);
selection = gdk_drag_get_selection (info->context);
if (selection)
gtk_drag_source_check_selection (info, selection, time);
}
return FALSE;
}
static void
gtk_drag_add_update_idle (GtkDragSourceInfo *info)
{
/* We use an idle lower than GDK_PRIORITY_REDRAW so that exposes
* from the last move can catch up before we move again.
*/
if (!info->update_idle)
info->update_idle = gdk_threads_add_idle_full (GDK_PRIORITY_REDRAW + 5,
gtk_drag_update_idle,
info,
NULL);
}
/**
* gtk_drag_update:
* @info: DragSourceInfo for the drag
* @screen: new screen
* @x_root: new X position
* @y_root: new y position
* @event: event received requiring update
*
* Updates the status of the drag; called when the
* cursor moves or the modifier changes
**/
static void
gtk_drag_update (GtkDragSourceInfo *info,
GdkScreen *screen,
gint x_root,
gint y_root,
GdkEvent *event)
{
info->cur_screen = screen;
info->cur_x = x_root;
info->cur_y = y_root;
if (info->last_event)
{
gdk_event_free ((GdkEvent *)info->last_event);
info->last_event = NULL;
}
if (event)
info->last_event = gdk_event_copy ((GdkEvent *)event);
gtk_drag_add_update_idle (info);
}
/*************************************************************
* gtk_drag_end:
* Called when the user finishes to drag, either by
* releasing the mouse, or by pressing Esc.
* arguments:
* info: Source info for the drag
* time: Timestamp for ending the drag
* results:
*************************************************************/
static void
gtk_drag_end (GtkDragSourceInfo *info, guint32 time)
{
GdkEvent *send_event;
GtkWidget *source_widget = info->widget;
GdkDisplay *display = gtk_widget_get_display (source_widget);
if (info->update_idle)
{
g_source_remove (info->update_idle);
info->update_idle = 0;
}
if (info->last_event)
{
gdk_event_free (info->last_event);
info->last_event = NULL;
}
info->have_grab = FALSE;
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_grab_broken_event_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_grab_notify_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_button_release_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_motion_cb,
info);
g_signal_handlers_disconnect_by_func (info->ipc_widget,
gtk_drag_key_cb,
info);
gdk_display_pointer_ungrab (display, time);
ungrab_dnd_keys (info->ipc_widget, time);
gtk_grab_remove (info->ipc_widget);
/* Send on a release pair to the original
* widget to convince it to release its grab. We need to
* call gtk_propagate_event() here, instead of
* gtk_widget_event() because widget like GtkList may
* expect propagation.
*/
send_event = gdk_event_new (GDK_BUTTON_RELEASE);
send_event->button.window = g_object_ref (gtk_widget_get_root_window (source_widget));
send_event->button.send_event = TRUE;
send_event->button.time = time;
send_event->button.x = 0;
send_event->button.y = 0;
send_event->button.axes = NULL;
send_event->button.state = 0;
send_event->button.button = info->button;
send_event->button.device = gdk_display_get_core_pointer (display);
send_event->button.x_root = 0;
send_event->button.y_root = 0;
gtk_propagate_event (source_widget, send_event);
gdk_event_free (send_event);
}
/*************************************************************
* gtk_drag_cancel:
* Called on cancellation of a drag, either by the user
* or programmatically.
* arguments:
* info: Source info for the drag
* time: Timestamp for ending the drag
* results:
*************************************************************/
static void
gtk_drag_cancel (GtkDragSourceInfo *info, GtkDragResult result, guint32 time)
{
gtk_drag_end (info, time);
gdk_drag_abort (info->context, time);
gtk_drag_drop_finished (info, result, time);
}
/*************************************************************
* gtk_drag_motion_cb:
* "motion-notify-event" callback during drag.
* arguments:
*
* results:
*************************************************************/
static gboolean
gtk_drag_motion_cb (GtkWidget *widget,
GdkEventMotion *event,
gpointer data)
{
GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
GdkScreen *screen;
gint x_root, y_root;
if (event->is_hint)
{
GdkDisplay *display = gtk_widget_get_display (widget);
gdk_display_get_pointer (display, &screen, &x_root, &y_root, NULL);
event->x_root = x_root;
event->y_root = y_root;
}
else
screen = gdk_event_get_screen ((GdkEvent *)event);
gtk_drag_update (info, screen, event->x_root, event->y_root, (GdkEvent *)event);
return TRUE;
}
/*************************************************************
* gtk_drag_key_cb:
* "key-press/release-event" callback during drag.
* arguments:
*
* results:
*************************************************************/
#define BIG_STEP 20
#define SMALL_STEP 1
static gboolean
gtk_drag_key_cb (GtkWidget *widget,
GdkEventKey *event,
gpointer data)
{
GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
GdkModifierType state;
GdkWindow *root_window;
gint dx, dy;
dx = dy = 0;
state = event->state & gtk_accelerator_get_default_mod_mask ();
if (event->type == GDK_KEY_PRESS)
{
switch (event->keyval)
{
case GDK_Escape:
gtk_drag_cancel (info, GTK_DRAG_RESULT_USER_CANCELLED, event->time);
return TRUE;
case GDK_space:
case GDK_Return:
case GDK_ISO_Enter:
case GDK_KP_Enter:
case GDK_KP_Space:
gtk_drag_end (info, event->time);
gtk_drag_drop (info, event->time);
return TRUE;
case GDK_Up:
case GDK_KP_Up:
dy = (state & GDK_MOD1_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_Down:
case GDK_KP_Down:
dy = (state & GDK_MOD1_MASK) ? BIG_STEP : SMALL_STEP;
break;
case GDK_Left:
case GDK_KP_Left:
dx = (state & GDK_MOD1_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_Right:
case GDK_KP_Right:
dx = (state & GDK_MOD1_MASK) ? BIG_STEP : SMALL_STEP;
break;
}
}
/* Now send a "motion" so that the modifier state is updated */
/* The state is not yet updated in the event, so we need
* to query it here. We could use XGetModifierMapping, but
* that would be overkill.
*/
root_window = gtk_widget_get_root_window (widget);
gdk_window_get_pointer (root_window, NULL, NULL, &state);
event->state = state;
if (dx != 0 || dy != 0)
{
info->cur_x += dx;
info->cur_y += dy;
gdk_display_warp_pointer (gtk_widget_get_display (widget),
gtk_widget_get_screen (widget),
info->cur_x, info->cur_y);
}
gtk_drag_update (info, info->cur_screen, info->cur_x, info->cur_y, (GdkEvent *)event);
return TRUE;
}
static gboolean
gtk_drag_grab_broken_event_cb (GtkWidget *widget,
GdkEventGrabBroken *event,
gpointer data)
{
GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
/* Don't cancel if we break the implicit grab from the initial button_press.
* Also, don't cancel if we re-grab on the widget or on our IPC window, for
* example, when changing the drag cursor.
*/
if (event->implicit
|| event->grab_window == info->widget->window
|| event->grab_window == info->ipc_widget->window)
return FALSE;
gtk_drag_cancel (info, GTK_DRAG_RESULT_GRAB_BROKEN, gtk_get_current_event_time ());
return TRUE;
}
static void
gtk_drag_grab_notify_cb (GtkWidget *widget,
gboolean was_grabbed,
gpointer data)
{
GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
if (!was_grabbed)
{
/* We have to block callbacks to avoid recursion here, because
gtk_drag_cancel calls gtk_grab_remove (via gtk_drag_end) */
g_signal_handlers_block_by_func (widget, gtk_drag_grab_notify_cb, data);
gtk_drag_cancel (info, GTK_DRAG_RESULT_GRAB_BROKEN, gtk_get_current_event_time ());
g_signal_handlers_unblock_by_func (widget, gtk_drag_grab_notify_cb, data);
}
}
/*************************************************************
* gtk_drag_button_release_cb:
* "button-release-event" callback during drag.
* arguments:
*
* results:
*************************************************************/
static gboolean
gtk_drag_button_release_cb (GtkWidget *widget,
GdkEventButton *event,
gpointer data)
{
GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
if (event->button != info->button)
return FALSE;
if ((info->context->action != 0) && (info->context->dest_window != NULL))
{
gtk_drag_end (info, event->time);
gtk_drag_drop (info, event->time);
}
else
{
gtk_drag_cancel (info, GTK_DRAG_RESULT_NO_TARGET, event->time);
}
return TRUE;
}
static gboolean
gtk_drag_abort_timeout (gpointer data)
{
GtkDragSourceInfo *info = data;
guint32 time = GDK_CURRENT_TIME;
if (info->proxy_dest)
time = info->proxy_dest->proxy_drop_time;
info->drop_timeout = 0;
gtk_drag_drop_finished (info, GTK_DRAG_RESULT_TIMEOUT_EXPIRED, time);
return FALSE;
}
/**
* gtk_drag_check_threshold:
* @widget: a #GtkWidget
* @start_x: X coordinate of start of drag
* @start_y: Y coordinate of start of drag
* @current_x: current X coordinate
* @current_y: current Y coordinate
*
* Checks to see if a mouse drag starting at (@start_x, @start_y) and ending
* at (@current_x, @current_y) has passed the GTK+ drag threshold, and thus
* should trigger the beginning of a drag-and-drop operation.
*
* Return Value: %TRUE if the drag threshold has been passed.
**/
gboolean
gtk_drag_check_threshold (GtkWidget *widget,
gint start_x,
gint start_y,
gint current_x,
gint current_y)
{
gint drag_threshold;
g_return_val_if_fail (GTK_IS_WIDGET (widget), FALSE);
g_object_get (gtk_widget_get_settings (widget),
"gtk-dnd-drag-threshold", &drag_threshold,
NULL);
return (ABS (current_x - start_x) > drag_threshold ||
ABS (current_y - start_y) > drag_threshold);
}
#define __GTK_DND_C__
#include "gtkaliasdef.c"
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