AuroraMiddleware/gtk2
1
0
Fork 0
forked from AuroraMiddleware/gtk
Code Issues Pull Requests Projects Releases Wiki Activity
c42e54e949
gtk2/gtk/gtkdnd.c
Matthias Clasen 542c824c71 Trivial doc fixes 
Remove two erroneous quotation marks.
2015-01-24 19:25:50 -05:00

4467 lines
138 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/* 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, see <http://www.gnu.org/licenses/>.
*/
/*
* 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 <math.h>
#include <stdlib.h>
#include <string.h>
#include "gdk/gdk.h"
#ifdef GDK_WINDOWING_X11
#include <X11/Xlib.h>
#include <X11/keysym.h>
#include "gdk/x11/gdkx.h"
#ifdef XINPUT_2
#include <X11/extensions/XInput2.h>
#endif
#endif
#ifdef GDK_WINDOWING_WAYLAND
#include <gdk/wayland/gdkwayland.h>
#endif
#include "gtkdnd.h"
#include "gtkiconhelperprivate.h"
#include "gtkicontheme.h"
#include "gtkmain.h"
#include "gtkplug.h"
#include "gtktooltipprivate.h"
#include "gtkwindow.h"
#include "gtkintl.h"
#include "gtkselectionprivate.h"
#include "gtkwindowprivate.h"
/**
* SECTION:gtkdnd
* @Short_description: Functions for controlling drag and drop handling
* @Title: Drag and Drop
*
* GTK+ has a rich set of functions for doing inter-process communication
* via the drag-and-drop metaphor.
*
* As well as the functions listed here, applications may need to use some
* facilities provided for [Selections][gtk3-Selections]. Also, the Drag and
* Drop API makes use of signals in the #GtkWidget class.
*/
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 */
GtkIconHelper *icon_helper;
GtkGesture *drag_gesture;
/* 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 */
GtkIconHelper *icon_helper;
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 */
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.
*/
guint dropped : 1; /* Set after we receive a drop */
gint drop_x, drop_y; /* Position of drop */
};
#define DROP_ABORT_TIME 300000
#define ANIM_TIME (0.5 * 1000 * 1000) /* half a second */
struct _GtkDragAnim
{
GtkDragSourceInfo *info;
gint64 start_time;
};
typedef gboolean (* GtkDragDestCallback) (GtkWidget *widget,
GdkDragContext *context,
gint x,
gint y,
guint32 time);
/* Enumeration for some targets we handle internally */
enum {
TARGET_DELETE = 0x40000002
};
/* Forward declarations */
static void gtk_drag_get_event_actions (const GdkEvent *event,
gint button,
GdkDragAction actions,
GdkDragAction *suggested_action,
GdkDragAction *possible_actions);
static GdkCursor * gtk_drag_get_cursor (GtkWidget *widget,
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 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 void gtk_drag_source_gesture_begin (GtkGesture *gesture,
GdkEventSequence *sequence,
gpointer data);
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 void gtk_drag_anim_destroy (GtkDragAnim *anim);
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,
const 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_helper (GdkDragContext *context,
GtkIconHelper *helper,
gint hot_x,
gint hot_y,
gboolean force_window);
/************************
* Cursor and Icon data *
************************/
static struct {
GdkDragAction action;
const gchar *name;
GdkPixbuf *pixbuf;
GdkCursor *cursor;
} drag_cursors[] = {
{ GDK_ACTION_DEFAULT, NULL },
{ GDK_ACTION_ASK, "dnd-ask", NULL, NULL },
{ GDK_ACTION_COPY, "dnd-copy", NULL, NULL },
{ GDK_ACTION_MOVE, "dnd-move", NULL, NULL },
{ GDK_ACTION_LINK, "dnd-link", NULL, NULL },
{ 0 , "dnd-none", NULL, NULL },
};
/*********************
* 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), -99, -99);
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_has_group (GTK_WINDOW (toplevel)))
gtk_window_group_add_window (gtk_window_get_group (GTK_WINDOW (toplevel)),
GTK_WINDOW (result));
}
return result;
}
#if defined (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;
else if (ev->type == GenericEvent)
{
XGenericEventCookie *cookie;
XIDeviceEvent *dev;
cookie = &ev->xcookie;
dev = (XIDeviceEvent *) cookie->data;
if (dev->evtype == XI_KeyPress ||
dev->evtype == XI_KeyRelease)
dev->event = (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,
GdkDevice *device,
guint32 time)
{
guint i;
GdkWindow *window, *root;
gint keycode;
#ifdef XINPUT_2
gint deviceid;
XIGrabModifiers mods;
gint num_mods;
XIEventMask evmask;
unsigned char mask[(XI_LASTEVENT + 7)/8];
gboolean using_xi2;
window = gtk_widget_get_window (widget);
if (!GDK_IS_X11_WINDOW (window))
{
gdk_device_grab (device,
gtk_widget_get_window (widget),
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK,
NULL, time);
return;
}
deviceid = gdk_x11_device_get_id (device);
if (GDK_IS_X11_DEVICE_MANAGER_XI2 (gdk_display_get_device_manager (gtk_widget_get_display (widget))))
using_xi2 = TRUE;
else
using_xi2 = FALSE;
#endif
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;
#ifdef XINPUT_2
if (using_xi2)
{
memset (mask, 0, sizeof (mask));
XISetMask (mask, XI_KeyPress);
XISetMask (mask, XI_KeyRelease);
evmask.deviceid = deviceid;
evmask.mask_len = sizeof (mask);
evmask.mask = mask;
num_mods = 1;
mods.modifiers = grab_keys[i].modifiers;
XIGrabKeycode (GDK_WINDOW_XDISPLAY (window),
deviceid,
keycode,
GDK_WINDOW_XID (root),
GrabModeAsync,
GrabModeAsync,
False,
&evmask,
num_mods,
&mods);
}
else
#endif
XGrabKey (GDK_WINDOW_XDISPLAY (window),
keycode, grab_keys[i].modifiers,
GDK_WINDOW_XID (root),
FALSE,
GrabModeAsync,
GrabModeAsync);
}
gdk_flush ();
gdk_error_trap_pop_ignored ();
gdk_window_add_filter (NULL, root_key_filter, (gpointer) GDK_WINDOW_XID (window));
}
static void
ungrab_dnd_keys (GtkWidget *widget,
GdkDevice *device,
guint32 time)
{
guint i;
GdkWindow *window, *root;
gint keycode;
#ifdef XINPUT_2
XIGrabModifiers mods;
gint num_mods;
gint deviceid;
gboolean using_xi2;
window = gtk_widget_get_window (widget);
if (!GDK_IS_X11_WINDOW (window))
{
gdk_device_ungrab (device, time);
return;
}
deviceid = gdk_x11_device_get_id (device);
if (GDK_IS_X11_DEVICE_MANAGER_XI2 (gdk_display_get_device_manager (gtk_widget_get_display (widget))))
using_xi2 = TRUE;
else
using_xi2 = FALSE;
#endif
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;
#ifdef XINPUT_2
if (using_xi2)
{
num_mods = 1;
mods.modifiers = grab_keys[i].modifiers;
XIUngrabKeycode (GDK_WINDOW_XDISPLAY (window),
deviceid,
keycode,
GDK_WINDOW_XID (root),
num_mods,
&mods);
}
else
#endif
XUngrabKey (GDK_WINDOW_XDISPLAY (window),
keycode, grab_keys[i].modifiers,
GDK_WINDOW_XID (root));
}
gdk_flush ();
gdk_error_trap_pop_ignored ();
}
#else /* !GDK_WINDOWING_X11 */
static void
grab_dnd_keys (GtkWidget *widget,
GdkDevice *device,
guint32 time)
{
gdk_device_grab (device,
gtk_widget_get_window (widget),
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK,
NULL, time);
}
static void
ungrab_dnd_keys (GtkWidget *widget,
GdkDevice *device,
guint32 time)
{
gdk_device_ungrab (device, time);
}
#endif /* GDK_WINDOWING_X11 */
/*
* gtk_drag_release_ipc_widget:
* @widget: the widget to release
*
* Releases widget retrieved with gtk_drag_get_ipc_widget().
*/
static void
gtk_drag_release_ipc_widget (GtkWidget *widget)
{
GtkWindow *window = GTK_WINDOW (widget);
GdkScreen *screen = gtk_widget_get_screen (widget);
GdkDragContext *context = g_object_get_data (G_OBJECT (widget), "drag-context");
GSList *drag_widgets = g_object_get_data (G_OBJECT (screen),
"gtk-dnd-ipc-widgets");
GdkDevice *pointer, *keyboard;
if (context)
{
pointer = gdk_drag_context_get_device (context);
keyboard = gdk_device_get_associated_device (pointer);
if (keyboard)
ungrab_dnd_keys (widget, keyboard, GDK_CURRENT_TIME);
}
if (gtk_window_has_group (window))
gtk_window_group_remove_window (gtk_window_get_group (window),
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 (const 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 == GDK_BUTTON_MIDDLE || button == GDK_BUTTON_SECONDARY) && (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;
}
}
else
{
if (actions & GDK_ACTION_MOVE)
{
*suggested_action = GDK_ACTION_MOVE;
*possible_actions = GDK_ACTION_MOVE;
}
}
}
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 void
ensure_drag_cursor_pixbuf (int i)
{
if (drag_cursors[i].pixbuf == NULL)
{
char *path = g_strconcat ("/org/gtk/libgtk/cursor/", drag_cursors[i].name, ".png", NULL);
GInputStream *stream = g_resources_open_stream (path, 0, NULL);
if (stream != NULL)
{
drag_cursors[i].pixbuf = gdk_pixbuf_new_from_stream (stream, NULL, NULL);
g_object_unref (stream);
}
g_free (path);
}
}
static void
get_surface_size (cairo_surface_t *surface,
gint *width,
gint *height)
{
gdouble x_scale, y_scale;
x_scale = y_scale = 1;
cairo_surface_get_device_scale (surface, &x_scale, &y_scale);
/* Assume any set scaling is icon scale */
*width =
ceil (cairo_image_surface_get_width (surface) / x_scale);
*height =
ceil (cairo_image_surface_get_height (surface) / y_scale);
}
static GdkCursor *
gtk_drag_get_cursor (GtkWidget *widget,
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 < G_N_ELEMENTS (drag_cursors) - 1; i++)
if (drag_cursors[i].cursor != NULL)
{
g_object_unref (drag_cursors[i].cursor);
drag_cursors[i].cursor = NULL;
}
}
for (i = 0 ; i < G_N_ELEMENTS (drag_cursors) - 1; i++)
if (drag_cursors[i].action == action)
break;
if (drag_cursors[i].cursor != NULL)
{
if (display != gdk_cursor_get_display (drag_cursors[i].cursor))
{
g_object_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)
{
ensure_drag_cursor_pixbuf (i);
drag_cursors[i].cursor = gdk_cursor_new_from_pixbuf (display, drag_cursors[i].pixbuf, 0, 0);
}
if (info && info->icon_helper)
{
gint cursor_width, cursor_height;
gint icon_width, icon_height;
gint width, height;
cairo_surface_t *icon_surface, *cursor_surface;
gdouble hot_x, hot_y;
gint icon_x, icon_y, ref_x, ref_y;
gint scale;
if (info->drag_cursors[i] != NULL)
{
if (display == gdk_cursor_get_display (info->drag_cursors[i]))
return info->drag_cursors[i];
g_object_unref (info->drag_cursors[i]);
info->drag_cursors[i] = NULL;
}
scale = gtk_widget_get_scale_factor (widget);
_gtk_icon_helper_get_size (info->icon_helper,
gtk_widget_get_style_context (widget),
&icon_width, &icon_height);
icon_surface = _gtk_icon_helper_ensure_surface (info->icon_helper,
gtk_widget_get_style_context (widget));
icon_x = info->hot_x;
icon_y = info->hot_y;
hot_x = hot_y = 0;
cursor_surface = gdk_cursor_get_surface (drag_cursors[i].cursor,
&hot_x, &hot_y);
if (!cursor_surface)
{
ensure_drag_cursor_pixbuf (i);
cursor_surface = gdk_cairo_surface_create_from_pixbuf (drag_cursors[i].pixbuf, 1, NULL);
}
get_surface_size (cursor_surface, &cursor_width, &cursor_height);
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 * scale, height * scale))
{
cairo_surface_t *surface;
cairo_t *cr;
/* Composite cursor and icon so that both hotspots
* end up at (ref_x, ref_y)
*/
surface =
gdk_window_create_similar_image_surface (NULL,
CAIRO_FORMAT_ARGB32,
width * scale, height * scale, scale);
cr = cairo_create (surface);
cairo_set_source_surface (cr, icon_surface,
ref_x - icon_x, ref_y - icon_y);
cairo_paint (cr);
cairo_set_source_surface (cr, cursor_surface,
ref_x - hot_x, ref_y - hot_y);
cairo_paint (cr);
cairo_destroy (cr);
info->drag_cursors[i] =
gdk_cursor_new_from_surface (display, surface, ref_x, ref_y);
cairo_surface_destroy (surface);
}
cairo_surface_destroy (cursor_surface);
cairo_surface_destroy (icon_surface);
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 < G_N_ELEMENTS (drag_cursors) - 1; i++)
if (info->cursor == drag_cursors[i].cursor ||
info->cursor == info->drag_cursors[i])
break;
if (i == G_N_ELEMENTS (drag_cursors))
return;
cursor = gtk_drag_get_cursor (info->widget,
gdk_cursor_get_display (info->cursor),
drag_cursors[i].action, info);
if (cursor != info->cursor)
{
GdkDevice *pointer;
pointer = gdk_drag_context_get_device (info->context);
gdk_device_grab (pointer,
gtk_widget_get_window (info->ipc_widget),
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
cursor, info->grab_time);
info->cursor = cursor;
}
}
/********************
* Destination side *
********************/
/**
* gtk_drag_get_data: (method)
* @widget: the widget that will receive the
* #GtkWidget::drag-data-received signal
* @context: the drag context
* @target: the target (form of the data) to retrieve
* @time_: a timestamp for retrieving the data. This will
* generally be the time received in a #GtkWidget::drag-motion
* or #GtkWidget::drag-drop signal
*
* Gets the data associated with a drag. When the data
* is received or the retrieval fails, GTK+ will emit a
* #GtkWidget::drag-data-received signal. Failure of the retrieval
* is indicated by the length field of the @selection_data
* signal parameter being negative. However, when gtk_drag_get_data()
* is called implicitely because the %GTK_DEST_DEFAULT_DROP was set,
* then the widget will not receive notification of failed
* drops.
*/
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: (method)
* @context: a (destination side) drag context
*
* Determines the source widget for a drag.
*
* Returns: (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: (method)
* @context: the drag context
* @success: a flag indicating whether the drop was successful
* @del: a flag indicating whether the source should delete the
* original data. (This should be %TRUE for a move)
* @time_: the timestamp from the #GtkWidget::drag-drop signal
*
* Informs the drag source that the drop is finished, and
* that the data of the drag will no longer be required.
*/
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");
}
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);
}
static gboolean
gtk_drag_highlight_draw (GtkWidget *widget,
cairo_t *cr,
gpointer data)
{
GtkAllocation alloc;
GtkStyleContext *context;
if (GTK_IS_WINDOW (widget))
{
/* We don't want to draw the drag highlight around the
* CSD window decorations
*/
gtk_widget_get_allocation (gtk_bin_get_child (GTK_BIN (widget)), &alloc);
}
else
{
alloc.x = 0;
alloc.y = 0;
alloc.width = gtk_widget_get_allocated_width (widget);
alloc.height = gtk_widget_get_allocated_height (widget);
}
context = gtk_widget_get_style_context (widget);
gtk_style_context_save (context);
gtk_style_context_add_class (context, GTK_STYLE_CLASS_DND);
gtk_render_frame (context, cr, alloc.x, alloc.y, alloc.width, alloc.height);
gtk_style_context_restore (context);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); /* black */
cairo_set_line_width (cr, 1.0);
cairo_rectangle (cr,
alloc.x + 0.5, alloc.y + 0.5,
alloc.width - 1, alloc.height - 1);
cairo_stroke (cr);
return FALSE;
}
/**
* gtk_drag_highlight: (method)
* @widget: a widget to highlight
*
* Draws a highlight around a widget. This will attach
* handlers to #GtkWidget::draw, so the highlight
* will continue to be displayed until gtk_drag_unhighlight()
* is called.
*/
void
gtk_drag_highlight (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_signal_connect_after (widget, "draw",
G_CALLBACK (gtk_drag_highlight_draw),
NULL);
gtk_widget_queue_draw (widget);
}
/**
* gtk_drag_unhighlight: (method)
* @widget: a widget to remove the highlight from
*
* Removes a highlight set by gtk_drag_highlight() from
* a widget.
*/
void
gtk_drag_unhighlight (GtkWidget *widget)
{
g_return_if_fail (GTK_IS_WIDGET (widget));
g_signal_handlers_disconnect_by_func (widget,
gtk_drag_highlight_draw,
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: (method)
* @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
* #GtkTargetEntrys 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:
* |[<!-- language="C" -->
* 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_slice_new0 (GtkDragDestSite);
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: (method)
* @widget: a #GtkWidget
* @proxy_window: the window to which to forward drag events
* @protocol: the drag protocol which the @proxy_window accepts
* (You can use gdk_drag_get_protocol() to determine this)
* @use_coordinates: If %TRUE, send the same coordinates to the
* destination, because it is an embedded
* subwindow.
*
* Sets this widget as a proxy for drops to another window.
*/
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_slice_new (GtkDragDestSite);
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: (method)
* @widget: a #GtkWidget
*
* Clears information about a drop destination set with
* gtk_drag_dest_set(). The widget will no longer receive
* notification of drags.
*/
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: (method)
* @widget: a #GtkWidget
*
* Returns the list of targets this widget can accept from
* drag-and-drop.
*
* Returns: (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: (method)
* @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: (method)
* @widget: a #GtkWidget that’s a drag destination
*
* Add the text targets supported by #GtkSelectionData 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: (method)
* @widget: a #GtkWidget that’s a drag destination
*
* Add the image targets supported by #GtkSelectionData 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: (method)
* @widget: a #GtkWidget that’s a drag destination
*
* Add the URI targets supported by #GtkSelectionData 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: (method)
* @widget: a #GtkWidget that’s a drag destination
* @track_motion: whether to accept all targets
*
* Tells the widget to emit #GtkWidget::drag-motion and
* #GtkWidget::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: (method)
* @widget: a #GtkWidget that’s a drag destination
*
* Returns whether the widget has been configured to always
* emit #GtkWidget::drag-motion signals.
*
* Returns: %TRUE if the widget always emits
* #GtkWidget::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:
* @toplevel: Toplevel widget that received the event
* @event: the event to handle
*
* Called from widget event handling code on Drag events
* for destinations.
*/
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:
{
GdkWindow *window;
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;
}
}
window = gtk_widget_get_window (toplevel);
#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 (window, &tx, &ty);
else
#endif /* GDK_WINDOWING_X11 */
gdk_window_get_position (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);
}
}
break;
default:
g_assert_not_reached ();
}
}
/**
* gtk_drag_dest_find_target: (method)
* @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.
*
* Returns: (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;
GdkAtom target;
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 &&
gtk_selection_data_get_target (info->proxy_data) == gtk_selection_data_get_target (selection_data))
{
gtk_selection_data_set (info->proxy_data,
gtk_selection_data_get_data_type (selection_data),
gtk_selection_data_get_format (selection_data),
gtk_selection_data_get_data (selection_data),
gtk_selection_data_get_length (selection_data));
gtk_main_quit ();
return;
}
target = gtk_selection_data_get_target (selection_data);
if (target == gdk_atom_intern_static_string ("DELETE"))
{
gtk_drag_finish (context, TRUE, FALSE, time);
}
else if ((target == gdk_atom_intern_static_string ("XmTRANSFER_SUCCESS")) ||
(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,
target,
&target_info))
{
if (!(site->flags & GTK_DEST_DEFAULT_DROP) ||
gtk_selection_data_get_length (selection_data) >= 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,
(gtk_selection_data_get_length (selection_data) >= 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);
}
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_free_full (hierarchy, g_object_unref);
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)
{
g_slice_free (GtkDragDestInfo, data);
}
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_slice_new0 (GtkDragDestInfo);
info->context = context;
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 (gtk_widget_get_window (toplevel));
}
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 (gtk_widget_get_window (toplevel));
}
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_slice_free (GtkDragDestSite, 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 *
***************/
static GtkIconHelper *
gtk_drag_source_site_get_icon_helper (GtkDragSourceSite *site)
{
GtkIconHelper *helper;
if (site)
helper = g_object_ref (site->icon_helper);
else
helper = _gtk_icon_helper_new ();
if (_gtk_icon_helper_get_is_empty (helper))
_gtk_icon_helper_set_icon_name (helper, "text-x-generic", GTK_ICON_SIZE_DND);
return helper;
}
/* Like gtk_drag_begin(), 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,
const GdkEvent *event,
int x,
int y)
{
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;
GdkDevice *pointer, *keyboard;
GdkWindow *ipc_window;
pointer = keyboard = NULL;
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 (widget,
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 ();
pointer = gdk_event_get_device (event);
if (gdk_device_get_source (pointer) == GDK_SOURCE_KEYBOARD)
{
keyboard = pointer;
pointer = gdk_device_get_associated_device (keyboard);
}
else
keyboard = gdk_device_get_associated_device (pointer);
}
else
{
GdkDeviceManager *device_manager;
device_manager = gdk_display_get_device_manager (gtk_widget_get_display (widget));
pointer = gdk_device_manager_get_client_pointer (device_manager);
keyboard = gdk_device_get_associated_device (pointer);
}
if (!pointer)
return NULL;
ipc_window = gtk_widget_get_window (ipc_widget);
if (gdk_device_grab (pointer, ipc_window,
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
cursor, time) != GDK_GRAB_SUCCESS)
{
gtk_drag_release_ipc_widget (ipc_widget);
return NULL;
}
if (keyboard)
grab_dnd_keys (ipc_widget, keyboard, time);
/* We use a GTK grab here to override any grabs that the widget
* we are dragging from might have held
*/
gtk_device_grab_add (ipc_widget, pointer, FALSE);
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_window, targets);
gdk_drag_context_set_device (context, pointer);
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)
info->cur_screen = gdk_event_get_screen (event);
else
gdk_device_get_position (pointer, &info->cur_screen, NULL, NULL);
if (x != -1 && y != -1)
{
GtkWidget *toplevel = gtk_widget_get_toplevel (widget);
gtk_widget_translate_coordinates (widget, toplevel,
x, y, &x, &y);
gdk_window_get_root_coords (gtk_widget_get_window (toplevel),
x, y, &info->start_x, &info->start_y);
}
else if (event && event->type == GDK_MOTION_NOTIFY)
{
info->start_x = event->motion.x_root;
info->start_y = event->motion.y_root;
}
else
gdk_device_get_position (pointer, NULL, &info->start_x, &info->start_y);
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_helper)
info->icon_helper = gtk_drag_source_site_get_icon_helper (site);
/* We need to composite the icon into the cursor, if we are
* not using an icon window.
*/
if (info->icon_helper)
{
cursor = gtk_drag_get_cursor (widget,
gtk_widget_get_display (widget),
suggested_action,
info);
if (cursor != info->cursor)
{
gdk_device_grab (pointer, gtk_widget_get_window (widget),
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_POINTER_MOTION_MASK |
GDK_BUTTON_RELEASE_MASK,
cursor, time);
info->cursor = cursor;
}
}
info->cur_x = info->start_x;
info->cur_y = info->start_y;
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);
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_with_coordinates: (method)
* @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
* @x: The initial x coordinate to start dragging from, in the coordinate space
* of @widget. If -1 is passed, the coordinates are retrieved from @event or
* the current pointer position
* @y: The initial y coordinate to start dragging from, in the coordinate space
* of @widget. If -1 is passed, the coordinates are retrieved from @event or
* the current pointer position
*
* 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 to get information about the drag.
*
* Generally there are three cases when you want to start a drag by hand by
* calling this function:
*
* 1. During a #GtkWidget::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 #GtkWidget::button-press-event handler.
*
* 2. During a #GtkWidget::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 #GtkWidget::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.
*
* Returns: (transfer none): the context for this drag
*
* Since: 3.10
*/
GdkDragContext *
gtk_drag_begin_with_coordinates (GtkWidget *widget,
GtkTargetList *targets,
GdkDragAction actions,
gint button,
GdkEvent *event,
gint x,
gint y)
{
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, x, y);
}
/**
* gtk_drag_begin: (method)
* @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
*
* This function is equivalent to gtk_drag_begin_with_coordinates(),
* passing -1, -1 as coordinates.
*
* Returns: (transfer none): the context for this drag
*
* Deprecated: 3.10: Use gtk_drag_begin_with_coordinates() instead
*/
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, -1, -1);
}
/**
* gtk_drag_source_set: (method)
* @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_slice_new0 (GtkDragSourceSite);
site->icon_helper = _gtk_icon_helper_new ();
site->drag_gesture = gtk_gesture_drag_new (widget);
gtk_event_controller_set_propagation_phase (GTK_EVENT_CONTROLLER (site->drag_gesture),
GTK_PHASE_NONE);
gtk_gesture_single_set_button (GTK_GESTURE_SINGLE (site->drag_gesture), 0);
g_signal_connect (site->drag_gesture, "begin",
G_CALLBACK (gtk_drag_source_gesture_begin),
site);
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: (method)
* @widget: a #GtkWidget
*
* Undoes the effects of gtk_drag_source_set().
*/
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: (method)
* @widget: a #GtkWidget
*
* Gets the list of targets this widget can provide for
* drag-and-drop.
*
* Returns: (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: (method)
* @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: (method)
* @widget: a #GtkWidget that’s is a drag source
*
* Add the text targets supported by #GtkSelectionData 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: (method)
* @widget: a #GtkWidget that’s is a drag source
*
* Add the writable image targets supported by #GtkSelectionData 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: (method)
* @widget: a #GtkWidget that’s is a drag source
*
* Add the URI targets supported by #GtkSelectionData 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);
}
/**
* gtk_drag_source_set_icon_pixbuf: (method)
* @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_icon_helper_set_pixbuf (site->icon_helper, pixbuf);
}
/**
* gtk_drag_source_set_icon_stock: (method)
* @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.
*
* Deprecated: 3.10: Use gtk_drag_source_set_icon_name() instead.
*/
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_icon_helper_set_stock_id (site->icon_helper, stock_id, GTK_ICON_SIZE_DND);
}
/**
* gtk_drag_source_set_icon_name: (method)
* @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_icon_helper_set_icon_name (site->icon_helper, icon_name, GTK_ICON_SIZE_DND);
}
/**
* gtk_drag_source_set_icon_gicon: (method)
* @widget: a #GtkWidget
* @icon: A #GIcon
*
* Sets the icon that will be used for drags from a particular source
* to @icon. See the docs for #GtkIconTheme for more details.
*
* Since: 3.2
*/
void
gtk_drag_source_set_icon_gicon (GtkWidget *widget,
GIcon *icon)
{
GtkDragSourceSite *site;
g_return_if_fail (GTK_IS_WIDGET (widget));
g_return_if_fail (icon != NULL);
site = g_object_get_data (G_OBJECT (widget), "gtk-site-data");
g_return_if_fail (site != NULL);
_gtk_icon_helper_set_gicon (site->icon_helper, icon, GTK_ICON_SIZE_DND);
}
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;
GtkIconHelper *helper;
/* HACK to get the appropriate icon
*/
save_icon_window = info->icon_window;
save_hot_x = info->hot_x;
save_hot_y = info->hot_y;
save_destroy_icon = info->destroy_icon;
info->icon_window = NULL;
helper = _gtk_icon_helper_new ();
_gtk_icon_helper_set_icon_name (helper, "text-x-generic", GTK_ICON_SIZE_DND);
set_icon_helper (info->context, helper, -2, -2, TRUE);
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;
g_object_unref (helper);
}
gtk_widget_hide (info->icon_window);
*icon_window = info->fallback_icon;
gtk_window_set_screen (GTK_WINDOW (*icon_window), info->cur_screen);
*hot_x = -2;
*hot_y = -2;
}
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 (gtk_widget_get_window (icon_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_helper)
g_clear_object (&info->icon_helper);
gtk_drag_update_cursor (info);
gtk_drag_update_icon (info);
}
/**
* gtk_drag_set_icon_widget: (method)
* @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.
*
* GTK+ will, however, change the opacity and position of
* the window as part of the drag animation. If you want
* to reuse the window, you have to restore these to
* the values you need after each drag operation.
*/
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
gtk_drag_draw_icon_pattern (GtkWidget *window,
cairo_t *cr,
gpointer pattern)
{
cairo_set_source (cr, pattern);
cairo_paint (cr);
}
static void
set_icon_helper (GdkDragContext *context,
GtkIconHelper *helper,
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 (helper != NULL);
screen = gdk_window_get_screen (gdk_drag_context_get_source_window (context));
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_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_set_app_paintable (window, TRUE);
display = gdk_window_get_display (gdk_drag_context_get_source_window (context));
_gtk_icon_helper_get_size (helper,
gtk_widget_get_style_context (window),
&width, &height);
#ifdef GDK_WINDOWING_WAYLAND
if (GDK_IS_WAYLAND_DISPLAY (display))
gtk_window_set_hardcoded_window (GTK_WINDOW (window),
gdk_wayland_drag_context_get_dnd_window (context));
#endif
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_helper)
g_object_unref (info->icon_helper);
info->icon_helper = g_object_ref (helper);
gtk_drag_set_icon_window (context, NULL, hot_x, hot_y, TRUE);
}
else
{
cairo_surface_t *surface;
cairo_pattern_t *pattern;
cairo_t *cr;
GdkPixbuf *pixbuf;
gtk_widget_set_size_request (window, width, height);
pixbuf = _gtk_icon_helper_ensure_pixbuf (helper, gtk_widget_get_style_context (window));
surface = gdk_window_create_similar_surface (gdk_screen_get_root_window (screen),
CAIRO_CONTENT_COLOR,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf));
cr = cairo_create (surface);
cairo_push_group_with_content (cr, CAIRO_CONTENT_COLOR_ALPHA);
gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_SATURATE);
cairo_paint (cr);
cairo_pop_group_to_source (cr);
cairo_paint (cr);
cairo_destroy (cr);
pattern = cairo_pattern_create_for_surface (surface);
cairo_surface_destroy (surface);
if (gdk_pixbuf_get_has_alpha (pixbuf))
{
cairo_region_t *region;
surface = cairo_image_surface_create (CAIRO_FORMAT_A1,
gdk_pixbuf_get_width (pixbuf),
gdk_pixbuf_get_height (pixbuf));
cr = cairo_create (surface);
gdk_cairo_set_source_pixbuf (cr, pixbuf, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
region = gdk_cairo_region_create_from_surface (surface);
gtk_widget_shape_combine_region (window, region);
cairo_region_destroy (region);
cairo_surface_destroy (surface);
}
g_object_unref (pixbuf);
g_signal_connect_data (window,
"draw",
G_CALLBACK (gtk_drag_draw_icon_pattern),
pattern,
(GClosureNotify) cairo_pattern_destroy,
G_CONNECT_AFTER);
gtk_drag_set_icon_window (context, window, hot_x, hot_y, TRUE);
}
}
/**
* gtk_drag_set_icon_pixbuf: (method)
* @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)
{
GtkIconHelper *icon;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (GDK_IS_PIXBUF (pixbuf));
icon = _gtk_icon_helper_new ();
_gtk_icon_helper_set_pixbuf (icon, pixbuf);
set_icon_helper (context, icon, hot_x, hot_y, FALSE);
g_object_unref (icon);
}
/**
* gtk_drag_set_icon_stock: (method)
* @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.
*
* Deprecated: 3.10: Use gtk_drag_set_icon_name() instead.
*/
void
gtk_drag_set_icon_stock (GdkDragContext *context,
const gchar *stock_id,
gint hot_x,
gint hot_y)
{
GtkIconHelper *icon;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (stock_id != NULL);
icon = _gtk_icon_helper_new ();
_gtk_icon_helper_set_stock_id (icon, stock_id, GTK_ICON_SIZE_DND);
set_icon_helper (context, icon, hot_x, hot_y, FALSE);
g_object_unref (icon);
}
/* XXX: This function is in gdk, too. Should it be in Cairo? */
static gboolean
_gtk_cairo_surface_extents (cairo_surface_t *surface,
GdkRectangle *extents)
{
double x1, x2, y1, y2;
cairo_t *cr;
g_return_val_if_fail (surface != NULL, FALSE);
g_return_val_if_fail (extents != NULL, FALSE);
cr = cairo_create (surface);
cairo_clip_extents (cr, &x1, &y1, &x2, &y2);
x1 = floor (x1);
y1 = floor (y1);
x2 = ceil (x2);
y2 = ceil (y2);
x2 -= x1;
y2 -= y1;
if (x1 < G_MININT || x1 > G_MAXINT ||
y1 < G_MININT || y1 > G_MAXINT ||
x2 > G_MAXINT || y2 > G_MAXINT)
{
extents->x = extents->y = extents->width = extents->height = 0;
return FALSE;
}
extents->x = x1;
extents->y = y1;
extents->width = x2;
extents->height = y2;
return TRUE;
}
/**
* gtk_drag_set_icon_surface: (method)
* @context: the context for a drag (This must be called
* with a context for the source side of a drag)
* @surface: the surface to use as icon
*
* Sets @surface as the icon for a given drag. GTK+ retains
* references for the arguments, and will release them when
* they are no longer needed.
*
* To position the surface relative to the mouse, use
* cairo_surface_set_device_offset() on @surface. The mouse
* cursor will be positioned at the (0,0) coordinate of the
* surface.
*/
void
gtk_drag_set_icon_surface (GdkDragContext *context,
cairo_surface_t *surface)
{
GtkWidget *window;
GdkScreen *screen;
GdkRectangle extents;
cairo_pattern_t *pattern;
GdkVisual *rgba_visual;
gboolean has_rgba;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (surface != NULL);
_gtk_cairo_surface_extents (surface, &extents);
screen = gdk_window_get_screen (gdk_drag_context_get_source_window (context));
rgba_visual = gdk_screen_get_rgba_visual (screen);
window = gtk_window_new (GTK_WINDOW_POPUP);
has_rgba =
rgba_visual != NULL &&
gdk_screen_is_composited (screen);
gtk_window_set_screen (GTK_WINDOW (window), screen);
if (has_rgba)
gtk_widget_set_visual (GTK_WIDGET (window), rgba_visual);
gtk_window_set_type_hint (GTK_WINDOW (window), GDK_WINDOW_TYPE_HINT_DND);
set_can_change_screen (window, TRUE);
#ifdef GDK_WINDOWING_WAYLAND
if (GDK_IS_WAYLAND_DISPLAY (gdk_screen_get_display (screen)))
gtk_window_set_hardcoded_window (GTK_WINDOW (window),
gdk_wayland_drag_context_get_dnd_window (context));
#endif
gtk_widget_set_events (window, GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK);
gtk_widget_set_app_paintable (window, TRUE);
gtk_widget_set_size_request (window, extents.width, extents.height);
gtk_widget_realize (window);
if (cairo_surface_get_content (surface) != CAIRO_CONTENT_COLOR &&
!has_rgba)
{
cairo_surface_t *saturated;
cairo_region_t *region;
cairo_t *cr;
region = gdk_cairo_region_create_from_surface (surface);
cairo_region_translate (region, -extents.x, -extents.y);
gtk_widget_shape_combine_region (window, region);
cairo_region_destroy (region);
/* Need to saturate the colors, so it doesn't look like semi-transparent
* pixels were painted on black. */
saturated = gdk_window_create_similar_surface (gtk_widget_get_window (window),
CAIRO_CONTENT_COLOR,
extents.width,
extents.height);
cr = cairo_create (saturated);
cairo_push_group_with_content (cr, CAIRO_CONTENT_COLOR_ALPHA);
cairo_set_source_surface (cr, surface, -extents.x, -extents.y);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_SATURATE);
cairo_paint (cr);
cairo_pop_group_to_source (cr);
cairo_paint (cr);
cairo_destroy (cr);
pattern = cairo_pattern_create_for_surface (saturated);
cairo_surface_destroy (saturated);
}
else
{
cairo_matrix_t matrix;
pattern = cairo_pattern_create_for_surface (surface);
cairo_matrix_init_translate (&matrix, extents.x, extents.y);
cairo_pattern_set_matrix (pattern, &matrix);
}
g_signal_connect_data (window,
"draw",
G_CALLBACK (gtk_drag_draw_icon_pattern),
pattern,
(GClosureNotify) cairo_pattern_destroy,
G_CONNECT_AFTER);
gtk_drag_set_icon_window (context, window, extents.x, extents.y, TRUE);
}
/**
* gtk_drag_set_icon_name: (method)
* @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)
{
GtkIconHelper *icon;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (icon_name != NULL);
icon = _gtk_icon_helper_new ();
_gtk_icon_helper_set_icon_name (icon, icon_name, GTK_ICON_SIZE_DND);
set_icon_helper (context, icon, hot_x, hot_y, FALSE);
g_object_unref (icon);
}
/**
* gtk_drag_set_icon_gicon: (method)
* @context: the context for a drag (This must be called
* with a context for the source side of a drag)
* @icon: a #GIcon
* @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 the given @icon.
* See the documentation for gtk_drag_set_icon_name()
* for more details about using icons in drag and drop.
*
* Since: 3.2
*/
void
gtk_drag_set_icon_gicon (GdkDragContext *context,
GIcon *icon,
gint hot_x,
gint hot_y)
{
GtkIconHelper *helper;
g_return_if_fail (GDK_IS_DRAG_CONTEXT (context));
g_return_if_fail (icon != NULL);
helper = _gtk_icon_helper_new ();
_gtk_icon_helper_set_gicon (helper, icon, GTK_ICON_SIZE_DND);
set_icon_helper (context, helper, hot_x, hot_y, FALSE);
g_object_unref (helper);
}
/**
* gtk_drag_set_icon_default: (method)
* @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));
gtk_drag_set_icon_name (context, "text-x-generic", -2, -2);
}
/*
* _gtk_drag_source_handle_event:
* @toplevel: Toplevel widget that received the event
* @event: the event to handle
*
* Called from widget event handling code on Drag events
* for drag sources.
*/
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 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 (widget,
gtk_widget_get_display (widget),
gdk_drag_context_get_selected_action (event->dnd.context),
info);
if (info->cursor != cursor)
{
GdkDevice *pointer;
pointer = gdk_drag_context_get_device (context);
gdk_device_grab (pointer, gtk_widget_get_window (widget),
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
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 ();
}
}
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;
}
gtk_selection_add_target (info->ipc_widget,
selection,
gdk_atom_intern_static_string ("DELETE"),
TARGET_DELETE);
}
/* Clean up from the drag, and display snapback, if necessary. */
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_slice_new0 (GtkDragAnim);
anim->info = info;
anim->start_time = gdk_frame_clock_get_frame_time (gtk_widget_get_frame_clock (info->widget));
info->cur_screen = gtk_widget_get_screen (info->widget);
if (!info->icon_window)
set_icon_helper (info->context, info->icon_helper,
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_full (G_PRIORITY_DEFAULT, 17, gtk_drag_anim_timeout, anim, (GDestroyNotify) gtk_drag_anim_destroy);
}
}
}
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) == gtk_widget_get_window (info->ipc_widget))
gtk_selection_owner_set_for_display (display, NULL, selection, time);
tmp_list = tmp_list->next;
}
g_list_free (info->selections);
info->selections = NULL;
}
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);
g_source_set_name_by_id (info->drop_timeout, "[gtk+] gtk_drag_abort_timeout");
}
}
/*
* Source side callbacks.
*/
static void
gtk_drag_source_gesture_begin (GtkGesture *gesture,
GdkEventSequence *sequence,
gpointer data)
{
GtkDragSourceSite *site = data;
guint button;
if (gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (gesture)))
button = 1;
else
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (gesture));
if (!site->start_button_mask ||
!(site->start_button_mask & (GDK_BUTTON1_MASK << (button - 1))))
gtk_gesture_set_state (gesture, GTK_EVENT_SEQUENCE_DENIED);
}
static gboolean
gtk_drag_source_event_cb (GtkWidget *widget,
GdkEvent *event,
gpointer data)
{
gdouble start_x, start_y, offset_x, offset_y;
GtkDragSourceSite *site = data;
gtk_event_controller_handle_event (GTK_EVENT_CONTROLLER (site->drag_gesture), event);
if (gtk_gesture_is_recognized (site->drag_gesture))
{
gtk_gesture_drag_get_start_point (GTK_GESTURE_DRAG (site->drag_gesture),
&start_x, &start_y);
gtk_gesture_drag_get_offset (GTK_GESTURE_DRAG (site->drag_gesture),
&offset_x, &offset_y);
if (gtk_drag_check_threshold (widget, start_x, start_y,
start_x + offset_x, start_y + offset_y))
{
GdkEventSequence *sequence;
const GdkEvent *event;
guint button;
sequence = gtk_gesture_single_get_current_sequence (GTK_GESTURE_SINGLE (site->drag_gesture));
event = gtk_gesture_get_last_event (site->drag_gesture, sequence);
button = gtk_gesture_single_get_current_button (GTK_GESTURE_SINGLE (site->drag_gesture));
gtk_event_controller_reset (GTK_EVENT_CONTROLLER (site->drag_gesture));
gtk_drag_begin_internal (widget, site, site->target_list,
site->actions, button, event,
start_x, start_y);
return TRUE;
}
}
return FALSE;
}
static void
gtk_drag_source_site_destroy (gpointer data)
{
GtkDragSourceSite *site = data;
if (site->target_list)
gtk_target_list_unref (site->target_list);
g_clear_object (&site->icon_helper);
g_clear_object (&site->drag_gesture);
g_slice_free (GtkDragSourceSite, 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;
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,
gtk_selection_data_get_target (selection_data),
time);
gtk_main ();
info->proxy_dest->proxy_data = NULL;
}
else
{
if (gtk_target_list_find (info->target_list,
gtk_selection_data_get_target (selection_data),
&target_info))
{
g_signal_emit_by_name (info->widget, "drag-data-get",
info->context,
selection_data,
target_info,
time);
}
}
break;
}
}
/* From clutter-easing.c, based on Robert Penner's
* infamous easing equations, MIT license.
*/
static double
ease_out_cubic (double t)
{
double p = t - 1;
return p * p * p + 1;
}
static void
gtk_drag_anim_destroy (GtkDragAnim *anim)
{
gtk_drag_source_info_destroy (anim->info);
g_slice_free (GtkDragAnim, anim);
}
static gboolean
gtk_drag_anim_timeout (gpointer data)
{
GtkWidget *icon_window;
GtkDragAnim *anim = data;
GtkDragSourceInfo *info = anim->info;
GtkWidget *widget = info->widget;
GdkFrameClock *frame_clock = gtk_widget_get_frame_clock (widget);
gint64 current_time = gdk_frame_clock_get_frame_time (frame_clock);
int hot_x, hot_y;
double f = (current_time - anim->start_time) / (double) ANIM_TIME;
double t;
if (f >= 1.0)
return G_SOURCE_REMOVE;
t = ease_out_cubic (f);
gtk_drag_get_icon (info, &icon_window, &hot_x, &hot_y);
gtk_window_move (GTK_WINDOW (icon_window),
(info->cur_x + (info->start_x - info->cur_x) * t) - hot_x,
(info->cur_y + (info->start_y - info->cur_y) * t) - hot_y);
gtk_widget_set_opacity (icon_window, (1.0 - f));
return G_SOURCE_CONTINUE;
}
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 < G_N_ELEMENTS (drag_cursors); i++)
{
if (info->drag_cursors[i] != NULL)
{
g_object_unref (info->drag_cursors[i]);
info->drag_cursors[i] = NULL;
}
}
gtk_drag_remove_icon (info);
g_clear_object (&info->icon_helper);
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 ? gtk_widget_get_window (info->icon_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);
g_source_set_name_by_id (info->update_idle, "[gtk+] gtk_drag_update_idle");
}
}
/*
* 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,
const 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);
}
/* Called when the user finishes to drag, either by
* releasing the mouse, or by pressing Esc.
*/
static void
gtk_drag_end (GtkDragSourceInfo *info,
guint32 time)
{
GtkWidget *source_widget = info->widget;
GdkDevice *pointer, *keyboard;
pointer = gdk_drag_context_get_device (info->context);
keyboard = gdk_device_get_associated_device (pointer);
/* 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_device_ungrab (pointer, time);
ungrab_dnd_keys (info->ipc_widget, keyboard, time);
gtk_device_grab_remove (info->ipc_widget, pointer);
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 (gdk_screen_get_root_window (gtk_widget_get_screen (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 = pointer;
send_event->button.x_root = 0;
send_event->button.y_root = 0;
gtk_propagate_event (source_widget, send_event);
gdk_event_free (send_event);
}
}
/* Called on cancellation of a drag, either by the user
* or programmatically.
*/
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);
}
/* “motion-notify-event” callback during drag. */
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)
{
gdk_device_get_position (event->device, &screen, &x_root, &y_root);
event->x_root = x_root;
event->y_root = y_root;
}
else
screen = gdk_event_get_screen ((GdkEvent *)event);
x_root = (gint)(event->x_root + 0.5);
y_root = (gint)(event->y_root + 0.5);
gtk_drag_update (info, screen, x_root, y_root, (GdkEvent *) event);
return TRUE;
}
#define BIG_STEP 20
#define SMALL_STEP 1
/* “key-press/release-event” callback during drag */
static gboolean
gtk_drag_key_cb (GtkWidget *widget,
GdkEventKey *event,
gpointer data)
{
GtkDragSourceInfo *info = (GtkDragSourceInfo *)data;
GdkModifierType state;
GdkWindow *root_window;
GdkDevice *pointer;
gint dx, dy;
dx = dy = 0;
state = event->state & gtk_accelerator_get_default_mod_mask ();
pointer = gdk_device_get_associated_device (gdk_event_get_device ((GdkEvent *) event));
if (event->type == GDK_KEY_PRESS)
{
switch (event->keyval)
{
case GDK_KEY_Escape:
gtk_drag_cancel (info, GTK_DRAG_RESULT_USER_CANCELLED, event->time);
return TRUE;
case GDK_KEY_space:
case GDK_KEY_Return:
case GDK_KEY_ISO_Enter:
case GDK_KEY_KP_Enter:
case GDK_KEY_KP_Space:
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;
case GDK_KEY_Up:
case GDK_KEY_KP_Up:
dy = (state & GDK_MOD1_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_KEY_Down:
case GDK_KEY_KP_Down:
dy = (state & GDK_MOD1_MASK) ? BIG_STEP : SMALL_STEP;
break;
case GDK_KEY_Left:
case GDK_KEY_KP_Left:
dx = (state & GDK_MOD1_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_KEY_Right:
case GDK_KEY_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 = gdk_screen_get_root_window (gtk_widget_get_screen (widget));
gdk_window_get_device_position (root_window, pointer, NULL, NULL, &state);
event->state = state;
if (dx != 0 || dy != 0)
{
info->cur_x += dx;
info->cur_y += dy;
gdk_device_warp (pointer,
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 == gtk_widget_get_window (info->widget)
|| event->grab_window == gtk_widget_get_window (info->ipc_widget))
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;
GdkDevice *pointer;
pointer = gdk_drag_context_get_device (info->context);
if (gtk_widget_device_is_shadowed (widget, pointer))
{
/* 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);
}
}
/* “button-release-event” callback during drag */
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: (method)
* @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.
*
* Returns: %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);
}
Reference in New Issue View Git Blame Copy Permalink