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gtk2/gtk/gtkdnd.c
Daniel Drake 149750773e gtkdnd: Don't bind/unbind keycodes that couldn't be determined 
At http://dev.laptop.org/ticket/10643 we are seeing that drag-and-drop
within the Sugar shell causes all of Sugar's custom keybindings to be
removed.

This is because gtkdnd tries to unbind XK_KP_Space, which (on my systems)
is resolved to NoSymbol by XKeycodeToKeysym(). NoSymbol has value 0,
the same as AnyKey, and XUngrabKey(AnyKey) is equivalent to unbinding
all possible keycodes.

Fix this by catching NoSymbol before binding/unbinding.

https://bugzilla.gnome.org/show_bug.cgi?id=652402
2011-06-13 15:10:11 +01:00

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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 "gtktooltip.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 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;
};
typedef gboolean (* GtkDragDestCallback) (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
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 gboolean gtk_drag_find_widget (GtkWidget *widget,
GdkDragContext *context,
GtkDragDestInfo *info,
gint x,
gint y,
guint32 time,
GtkDragDestCallback callback);
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);
if (keycode == NoSymbol)
continue;
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);
if (keycode == NoSymbol)
continue;
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));
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:
* @context: a (destination side) drag context
*
* Determines the source widget for a drag.
*
* Return value: (transfer none): if the drag is occurring
* within a single application, a pointer to the source widget.
* Otherwise, %NULL.
*/
GtkWidget *
gtk_drag_get_source_widget (GdkDragContext *context)
{
GSList *tmp_list;
g_return_val_if_fail (GDK_IS_DRAG_CONTEXT (context), NULL);
tmp_list = source_widgets;
while (tmp_list)
{
GtkWidget *ipc_widget = tmp_list->data;
if (gtk_widget_get_window (ipc_widget) == gdk_drag_context_get_source_window (context))
{
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));
if (success && del)
{
target = gdk_atom_intern_static_string ("DELETE");
}
else if (gdk_drag_context_get_protocol (context) == 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_window_get_screen (gdk_drag_context_get_source_window (context)));
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;
width = gdk_window_get_width (widget->window);
height = gdk_window_get_height (widget->window);
}
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: (transfer none): 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:
{
gint tx, ty;
gboolean found;
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);
found = gtk_drag_find_widget (toplevel,
context,
info,
event->dnd.x_root - tx,
event->dnd.y_root - ty,
event->dnd.time,
(event->type == GDK_DRAG_MOTION) ?
gtk_drag_dest_motion :
gtk_drag_dest_drop);
if (info->widget && !found)
{
gtk_drag_dest_leave (info->widget, context, event->dnd.time);
info->widget = NULL;
}
/* Send a reply.
*/
if (event->type == GDK_DRAG_MOTION)
{
if (!found)
gdk_drag_status (context, 0, event->dnd.time);
}
else if (event->type == GDK_DROP_START && !info->proxy_source)
{
gdk_drop_reply (context, found, event->dnd.time);
if ((gdk_drag_context_get_protocol (context) == GDK_DRAG_PROTO_MOTIF) && !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 the supported targets of @context 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: (transfer none): 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);
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 = gdk_drag_context_list_targets (context);
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),
(gdk_drag_context_get_selected_action (context) == 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);
}
/*************************************************************
* gtk_drag_find_widget:
* Function used to locate widgets for
* DRAG_MOTION and DROP_START events.
*************************************************************/
static gboolean
gtk_drag_find_widget (GtkWidget *widget,
GdkDragContext *context,
GtkDragDestInfo *info,
gint x,
gint y,
guint32 time,
GtkDragDestCallback callback)
{
if (!gtk_widget_get_mapped (widget) ||
!gtk_widget_get_sensitive (widget))
return FALSE;
/* Get the widget at the pointer coordinates and travel up
* the widget hierarchy from there.
*/
widget = _gtk_widget_find_at_coords (gtk_widget_get_window (widget),
x, y, &x, &y);
if (!widget)
return FALSE;
while (widget)
{
GtkWidget *parent;
GList *hierarchy = NULL;
gboolean found = FALSE;
if (!gtk_widget_get_mapped (widget) ||
!gtk_widget_get_sensitive (widget))
return FALSE;
/* need to reference the entire hierarchy temporarily in case the
* ::drag-motion/::drag-drop callbacks change the widget hierarchy.
*/
for (parent = widget;
parent;
parent = gtk_widget_get_parent (parent))
{
hierarchy = g_list_prepend (hierarchy, g_object_ref (parent));
}
/* If the current widget is registered as a drop site, check to
* emit "drag-motion" to check if we are actually in a drop
* site.
*/
if (g_object_get_data (G_OBJECT (widget), "gtk-drag-dest"))
{
found = callback (widget, context, x, y, time);
/* If so, send a "drag-leave" to the last widget */
if (found)
{
if (info->widget && info->widget != widget)
{
gtk_drag_dest_leave (info->widget, context, time);
}
info->widget = widget;
}
}
if (!found)
{
/* Get the parent before unreffing the hierarchy because
* invoking the callback might have destroyed the widget
*/
parent = gtk_widget_get_parent (widget);
/* The parent might be going away when unreffing the
* hierarchy, so also protect againt that
*/
if (parent)
g_object_add_weak_pointer (G_OBJECT (parent), (gpointer *) &parent);
}
g_list_foreach (hierarchy, (GFunc) g_object_unref, NULL);
g_list_free (hierarchy);
if (found)
return TRUE;
if (parent)
g_object_remove_weak_pointer (G_OBJECT (parent), (gpointer *) &parent);
else
return FALSE;
if (!gtk_widget_translate_coordinates (widget, parent, x, y, &x, &y))
return FALSE;
widget = parent;
}
return FALSE;
}
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 (gtk_widget_get_window (ipc_widget),
gdk_drag_context_list_targets (dest_info->context));
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 = gdk_drag_context_list_targets (dest_info->context);
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_window_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,
gdk_drag_context_get_suggested_action (context),
gdk_drag_context_get_actions (context),
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 (gdk_drag_context_get_suggested_action (context) & site->actions)
action = gdk_drag_context_get_suggested_action (context);
else
{
gint i;
for (i = 0; i < 8; i++)
{
if ((site->actions & (1 << i)) &&
(gdk_drag_context_get_actions (context) & (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 ||
(gdk_drag_context_get_protocol (info->context) == 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_window_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,
gdk_drag_context_get_suggested_action (context),
gdk_drag_context_get_actions (context),
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 (time == GDK_CURRENT_TIME)
time = gtk_get_current_event_time ();
}
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.
*
* The @event is used to retrieve the timestamp that will be used internally to
* grab the pointer. If @event is #NULL, then GDK_CURRENT_TIME will be used.
* However, you should try to pass a real event in all cases, since that can be
* used by GTK+ to get information about the start position of the drag, for
* example if the @event is a GDK_MOTION_NOTIFY.
*
* Generally there are three cases when you want to start a drag by hand by calling
* this function:
*
* 1. During a button-press-event handler, if you want to start a drag immediately
* when the user presses the mouse button. Pass the @event that you have in your
* button-press-event handler.
*
* 2. During a motion-notify-event handler, if you want to start a drag when the mouse
* moves past a certain threshold distance after a button-press. Pass the @event that you
* have in your motion-notify-event handler.
*
* 3. During a timeout handler, if you want to start a drag after the mouse
* button is held down for some time. Try to save the last event that you got
* from the mouse, using gdk_event_copy(), and pass it to this function
* (remember to free the event with gdk_event_free() when you are done). If you
* can really not pass a real event, pass #NULL instead.
*
* Return value: (transfer none): 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: (transfer none): 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 (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_window_get_screen (gdk_drag_context_get_source_window (context));
/* 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_window_get_display (gdk_drag_context_get_source_window (context));
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 (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 (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 (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_window_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 (icon_name != NULL);
screen = gdk_window_get_screen (gdk_drag_context_get_source_window (context));
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));
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 = gdk_drag_context_get_selected_action (context) != 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,
gdk_drag_context_get_selected_action (event->dnd.context),
event->dnd.time);
}
}
}
else if (info->have_grab)
{
cursor = gtk_drag_get_cursor (gtk_widget_get_display (widget),
gdk_drag_context_get_selected_action (event->dnd.context),
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 (gdk_drag_context_get_protocol (info->context) == 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 (gdk_drag_context_get_protocol (info->context) == 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)
{
GtkWidget *source_widget = info->widget;
GdkDisplay *display = gtk_widget_get_display (source_widget);
/* Prevent ungrab before grab (see bug 623865) */
if (info->grab_time == GDK_CURRENT_TIME)
time = GDK_CURRENT_TIME;
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);
if (gtk_widget_get_realized (source_widget))
{
GdkEvent *send_event;
/* 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 ((gdk_drag_context_get_selected_action (info->context) != 0) &&
(gdk_drag_context_get_dest_window (info->context) != 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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