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gtk/gdk/x11/gdkdrag-x11.c
Emmanuele Bassi f28aa1ba02 Restructure the GdkEvent type hierarchy 
GdkEvent has been a "I-can't-believe-this-is-not-OOP" type for ages,
using a union of sub-types. This has always been problematic when it
comes to implementing accessor functions: either you get generic API
that takes a GdkEvent and uses a massive switch() to determine which
event types have the data you're looking for; or you create namespaced
accessors, but break language bindings horribly, as boxed types cannot
have derived types.

The recent conversion of GskRenderNode (which had similar issues) to
GTypeInstance, and the fact that GdkEvent is now a completely opaque
type, provide us with the chance of moving GdkEvent to GTypeInstance,
and have sub-types for GdkEvent.

The change from boxed type to GTypeInstance is pretty small, all things
considered, but ends up cascading to a larger commit, as we still have
backends and code in GTK trying to access GdkEvent structures directly.
Additionally, the naming of the public getter functions requires
renaming all the data structures to conform to the namespace/type-name
pattern.
2020-04-16 19:54:02 +01:00

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/* GDK - The GIMP Drawing Kit
* 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 "gdkx11dnd.h"
#include "gdk-private.h"
#include "gdkasync.h"
#include "gdkclipboardprivate.h"
#include "gdkclipboard-x11.h"
#include "gdkdeviceprivate.h"
#include "gdkdisplay-x11.h"
#include "gdkdragprivate.h"
#include "gdksurfaceprivate.h"
#include "gdkinternals.h"
#include "gdkintl.h"
#include "gdkprivate-x11.h"
#include "gdkscreen-x11.h"
#include "gdkselectioninputstream-x11.h"
#include "gdkselectionoutputstream-x11.h"
#include <math.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <X11/extensions/shape.h>
#ifdef HAVE_XCOMPOSITE
#include <X11/extensions/Xcomposite.h>
#endif
#include <string.h>
typedef enum {
GDK_DRAG_STATUS_DRAG,
GDK_DRAG_STATUS_MOTION_WAIT,
GDK_DRAG_STATUS_ACTION_WAIT,
GDK_DRAG_STATUS_DROP
} GtkDragStatus;
/*
* GdkDragProtocol:
* @GDK_DRAG_PROTO_NONE: no protocol.
* @GDK_DRAG_PROTO_XDND: The Xdnd protocol.
* @GDK_DRAG_PROTO_ROOTWIN: An extension to the Xdnd protocol for
* unclaimed root window drops.
*
* Used in #GdkDrag to indicate the protocol according to
* which DND is done.
*/
typedef enum
{
GDK_DRAG_PROTO_NONE = 0,
GDK_DRAG_PROTO_XDND,
GDK_DRAG_PROTO_ROOTWIN
} GdkDragProtocol;
typedef struct {
guint32 xid;
gint x, y, width, height;
gboolean mapped;
gboolean shape_selected;
gboolean shape_valid;
cairo_region_t *shape;
} GdkCacheChild;
struct _GdkSurfaceCache {
GList *children;
GHashTable *child_hash;
guint old_event_mask;
GdkDisplay *display;
gint ref_count;
};
struct _GdkX11Drag
{
GdkDrag drag;
GdkDragProtocol protocol;
gint start_x; /* Where the drag started */
gint start_y;
guint16 last_x; /* Coordinates from last event */
guint16 last_y;
gulong timestamp; /* Timestamp we claimed the DND selection with */
GdkDragAction xdnd_actions; /* What is currently set in XdndActionList */
guint version; /* Xdnd protocol version */
GdkSurfaceCache *cache;
GdkSurface *drag_surface;
GdkSurface *ipc_surface;
GdkCursor *cursor;
GdkSeat *grab_seat;
GdkDragAction actions;
GdkDragAction current_action;
gint hot_x;
gint hot_y;
Window dest_xid; /* The last window we looked up */
Window proxy_xid; /* The proxy window for dest_xid (or dest_xid if no proxying happens) */
Window drop_xid; /* The (non-proxied) window that is receiving drops */
guint xdnd_targets_set : 1; /* Whether we've already set XdndTypeList */
guint xdnd_have_actions : 1; /* Whether an XdndActionList was provided */
guint drag_status : 4; /* current status of drag */
guint drop_failed : 1; /* Whether the drop was unsuccessful */
};
struct _GdkX11DragClass
{
GdkDragClass parent_class;
};
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 }
};
/* Forward declarations */
static GdkSurfaceCache *gdk_surface_cache_ref (GdkSurfaceCache *cache);
static void gdk_surface_cache_unref (GdkSurfaceCache *cache);
gboolean gdk_x11_drag_handle_event (GdkDrag *drag,
GdkEvent *event);
static GList *drags;
static GSList *window_caches;
G_DEFINE_TYPE (GdkX11Drag, gdk_x11_drag, GDK_TYPE_DRAG)
static void
gdk_x11_drag_init (GdkX11Drag *drag)
{
drags = g_list_prepend (drags, drag);
}
static void gdk_x11_drag_finalize (GObject *object);
static Window gdk_x11_drag_find_surface (GdkDrag *drag,
GdkSurface *drag_surface,
gint x_root,
gint y_root,
GdkDragProtocol *protocol);
static gboolean gdk_x11_drag_drag_motion (GdkDrag *drag,
Window proxy_xid,
GdkDragProtocol protocol,
gint x_root,
gint y_root,
GdkDragAction suggested_action,
GdkDragAction possible_actions,
guint32 time);
static void gdk_x11_drag_drop (GdkDrag *drag,
guint32 time_);
static GdkSurface * gdk_x11_drag_get_drag_surface (GdkDrag *drag);
static void gdk_x11_drag_set_hotspot (GdkDrag *drag,
gint hot_x,
gint hot_y);
static void gdk_x11_drag_drop_done (GdkDrag *drag,
gboolean success);
static void gdk_x11_drag_set_cursor (GdkDrag *drag,
GdkCursor *cursor);
static void gdk_x11_drag_cancel (GdkDrag *drag,
GdkDragCancelReason reason);
static void gdk_x11_drag_drop_performed (GdkDrag *drag,
guint32 time);
static void
gdk_x11_drag_class_init (GdkX11DragClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
GdkDragClass *drag_class = GDK_DRAG_CLASS (klass);
object_class->finalize = gdk_x11_drag_finalize;
drag_class->get_drag_surface = gdk_x11_drag_get_drag_surface;
drag_class->set_hotspot = gdk_x11_drag_set_hotspot;
drag_class->drop_done = gdk_x11_drag_drop_done;
drag_class->set_cursor = gdk_x11_drag_set_cursor;
drag_class->cancel = gdk_x11_drag_cancel;
drag_class->drop_performed = gdk_x11_drag_drop_performed;
drag_class->handle_event = gdk_x11_drag_handle_event;
}
static void
gdk_x11_drag_finalize (GObject *object)
{
GdkDrag *drag = GDK_DRAG (object);
GdkX11Drag *x11_drag = GDK_X11_DRAG (object);
GdkSurface *drag_surface, *ipc_surface;
if (x11_drag->cache)
gdk_surface_cache_unref (x11_drag->cache);
drags = g_list_remove (drags, drag);
drag_surface = x11_drag->drag_surface;
ipc_surface = x11_drag->ipc_surface;
G_OBJECT_CLASS (gdk_x11_drag_parent_class)->finalize (object);
if (drag_surface)
gdk_surface_destroy (drag_surface);
if (ipc_surface)
gdk_surface_destroy (ipc_surface);
}
/* Drag Contexts */
GdkDrag *
gdk_x11_drag_find (GdkDisplay *display,
Window source_xid,
Window dest_xid)
{
GList *tmp_list;
GdkDrag *drag;
GdkX11Drag *drag_x11;
Window drag_dest_xid;
GdkSurface *surface;
Window surface_xid;
for (tmp_list = drags; tmp_list; tmp_list = tmp_list->next)
{
drag = (GdkDrag *)tmp_list->data;
drag_x11 = (GdkX11Drag *)drag;
if (gdk_drag_get_display (drag) != display)
continue;
g_object_get (drag, "surface", &surface, NULL);
surface_xid = surface ? GDK_SURFACE_XID (surface) : None;
g_object_unref (surface);
drag_dest_xid = drag_x11->proxy_xid
? (drag_x11->drop_xid
? drag_x11->drop_xid
: drag_x11->proxy_xid)
: None;
if (((source_xid == None) || (surface && (surface_xid == source_xid))) &&
((dest_xid == None) || (drag_dest_xid == dest_xid)))
return drag;
}
return NULL;
}
static void
precache_target_list (GdkDrag *drag)
{
GdkContentFormats *formats = gdk_drag_get_formats (drag);
const char * const *atoms;
gsize n_atoms;
atoms = gdk_content_formats_get_mime_types (formats, &n_atoms);
_gdk_x11_precache_atoms (gdk_drag_get_display (drag),
(const gchar **) atoms,
n_atoms);
}
/* Utility functions */
static void
free_cache_child (GdkCacheChild *child,
GdkDisplay *display)
{
if (child->shape)
cairo_region_destroy (child->shape);
if (child->shape_selected && display)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
XShapeSelectInput (display_x11->xdisplay, child->xid, 0);
}
g_free (child);
}
static void
gdk_surface_cache_add (GdkSurfaceCache *cache,
guint32 xid,
gint x,
gint y,
gint width,
gint height,
gboolean mapped)
{
GdkCacheChild *child = g_new (GdkCacheChild, 1);
child->xid = xid;
child->x = x;
child->y = y;
child->width = width;
child->height = height;
child->mapped = mapped;
child->shape_selected = FALSE;
child->shape_valid = FALSE;
child->shape = NULL;
cache->children = g_list_prepend (cache->children, child);
g_hash_table_insert (cache->child_hash, GUINT_TO_POINTER (xid),
cache->children);
}
GdkFilterReturn
gdk_surface_cache_shape_filter (const XEvent *xevent,
gpointer data)
{
GdkSurfaceCache *cache = data;
GdkX11Display *display = GDK_X11_DISPLAY (cache->display);
if (display->have_shapes &&
xevent->type == display->shape_event_base + ShapeNotify)
{
XShapeEvent *xse = (XShapeEvent*)xevent;
GList *node;
node = g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xse->window));
if (node)
{
GdkCacheChild *child = node->data;
child->shape_valid = FALSE;
if (child->shape)
{
cairo_region_destroy (child->shape);
child->shape = NULL;
}
}
return GDK_FILTER_REMOVE;
}
return GDK_FILTER_CONTINUE;
}
GdkFilterReturn
gdk_surface_cache_filter (const XEvent *xevent,
gpointer data)
{
GdkSurfaceCache *cache = data;
switch (xevent->type)
{
case CirculateNotify:
break;
case ConfigureNotify:
{
const XConfigureEvent *xce = &xevent->xconfigure;
GList *node;
node = g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xce->window));
if (node)
{
GdkCacheChild *child = node->data;
child->x = xce->x;
child->y = xce->y;
child->width = xce->width;
child->height = xce->height;
if (xce->above == None && (node->next))
{
GList *last = g_list_last (cache->children);
cache->children = g_list_remove_link (cache->children, node);
last->next = node;
node->next = NULL;
node->prev = last;
}
else
{
GList *above_node = g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xce->above));
if (above_node && node->next != above_node)
{
/* Put the window above (before in the list) above_node */
cache->children = g_list_remove_link (cache->children, node);
node->prev = above_node->prev;
if (node->prev)
node->prev->next = node;
else
cache->children = node;
node->next = above_node;
above_node->prev = node;
}
}
}
break;
}
case CreateNotify:
{
const XCreateWindowEvent *xcwe = &xevent->xcreatewindow;
if (!g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xcwe->window)))
gdk_surface_cache_add (cache, xcwe->window,
xcwe->x, xcwe->y, xcwe->width, xcwe->height,
FALSE);
break;
}
case DestroyNotify:
{
const XDestroyWindowEvent *xdwe = &xevent->xdestroywindow;
GList *node;
node = g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xdwe->window));
if (node)
{
GdkCacheChild *child = node->data;
g_hash_table_remove (cache->child_hash,
GUINT_TO_POINTER (xdwe->window));
cache->children = g_list_remove_link (cache->children, node);
/* window is destroyed, no need to disable ShapeNotify */
free_cache_child (child, NULL);
g_list_free_1 (node);
}
break;
}
case MapNotify:
{
const XMapEvent *xme = &xevent->xmap;
GList *node;
node = g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xme->window));
if (node)
{
GdkCacheChild *child = node->data;
child->mapped = TRUE;
}
break;
}
case ReparentNotify:
break;
case UnmapNotify:
{
const XMapEvent *xume = &xevent->xmap;
GList *node;
node = g_hash_table_lookup (cache->child_hash,
GUINT_TO_POINTER (xume->window));
if (node)
{
GdkCacheChild *child = node->data;
child->mapped = FALSE;
}
break;
}
default:
return GDK_FILTER_CONTINUE;
}
return GDK_FILTER_REMOVE;
}
static GdkSurfaceCache *
gdk_surface_cache_new (GdkDisplay *display)
{
XWindowAttributes xwa;
GdkX11Screen *screen = GDK_X11_DISPLAY (display)->screen;
Display *xdisplay = GDK_SCREEN_XDISPLAY (screen);
Window xroot_window = GDK_DISPLAY_XROOTWIN (display);
GdkChildInfoX11 *children;
guint nchildren, i;
#ifdef HAVE_XCOMPOSITE
Window cow;
#endif
GdkSurfaceCache *result = g_new (GdkSurfaceCache, 1);
result->children = NULL;
result->child_hash = g_hash_table_new (g_direct_hash, NULL);
result->display = display;
result->ref_count = 1;
XGetWindowAttributes (xdisplay, xroot_window, &xwa);
result->old_event_mask = xwa.your_event_mask;
if (G_UNLIKELY (!GDK_X11_DISPLAY (display)->trusted_client))
{
GList *toplevel_windows, *list;
GdkSurface *surface;
GdkX11Surface *impl;
gint x, y, width, height;
toplevel_windows = gdk_x11_display_get_toplevel_windows (display);
for (list = toplevel_windows; list; list = list->next)
{
surface = GDK_SURFACE (list->data);
impl = GDK_X11_SURFACE (surface);
gdk_surface_get_geometry (surface, &x, &y, &width, &height);
gdk_surface_cache_add (result, GDK_SURFACE_XID (surface),
x * impl->surface_scale, y * impl->surface_scale,
width * impl->surface_scale,
height * impl->surface_scale,
gdk_surface_get_mapped (surface));
}
return result;
}
XSelectInput (xdisplay, xroot_window, result->old_event_mask | SubstructureNotifyMask);
if (!_gdk_x11_get_window_child_info (display,
xroot_window,
FALSE, NULL,
&children, &nchildren))
return result;
for (i = 0; i < nchildren ; i++)
{
gdk_surface_cache_add (result, children[i].window,
children[i].x, children[i].y, children[i].width, children[i].height,
children[i].is_mapped);
}
g_free (children);
#ifdef HAVE_XCOMPOSITE
/*
* Add the composite overlay window to the cache, as this can be a reasonable
* Xdnd proxy as well.
* This is only done when the screen is composited in order to avoid mapping
* the COW. We assume that the CM is using the COW (which is true for pretty
* much any CM currently in use).
*/
if (gdk_display_is_composited (display))
{
cow = XCompositeGetOverlayWindow (xdisplay, xroot_window);
gdk_surface_cache_add (result, cow, 0, 0,
WidthOfScreen (GDK_X11_SCREEN (screen)->xscreen),
HeightOfScreen (GDK_X11_SCREEN (screen)->xscreen),
TRUE);
XCompositeReleaseOverlayWindow (xdisplay, xroot_window);
}
#endif
return result;
}
static void
gdk_surface_cache_destroy (GdkSurfaceCache *cache)
{
XSelectInput (GDK_DISPLAY_XDISPLAY (cache->display),
GDK_DISPLAY_XROOTWIN (cache->display),
cache->old_event_mask);
gdk_x11_display_error_trap_push (cache->display);
g_list_foreach (cache->children, (GFunc)free_cache_child, cache->display);
gdk_x11_display_error_trap_pop_ignored (cache->display);
g_list_free (cache->children);
g_hash_table_destroy (cache->child_hash);
g_free (cache);
}
static GdkSurfaceCache *
gdk_surface_cache_ref (GdkSurfaceCache *cache)
{
cache->ref_count += 1;
return cache;
}
static void
gdk_surface_cache_unref (GdkSurfaceCache *cache)
{
g_assert (cache->ref_count > 0);
cache->ref_count -= 1;
if (cache->ref_count == 0)
{
window_caches = g_slist_remove (window_caches, cache);
gdk_surface_cache_destroy (cache);
}
}
GdkSurfaceCache *
gdk_surface_cache_get (GdkDisplay *display)
{
GSList *list;
GdkSurfaceCache *cache;
for (list = window_caches; list; list = list->next)
{
cache = list->data;
if (cache->display == display)
return gdk_surface_cache_ref (cache);
}
cache = gdk_surface_cache_new (display);
window_caches = g_slist_prepend (window_caches, cache);
return cache;
}
static gboolean
is_pointer_within_shape (GdkDisplay *display,
GdkCacheChild *child,
gint x_pos,
gint y_pos)
{
if (!child->shape_selected)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
XShapeSelectInput (display_x11->xdisplay, child->xid, ShapeNotifyMask);
child->shape_selected = TRUE;
}
if (!child->shape_valid)
{
GdkX11Display *display_x11 = GDK_X11_DISPLAY (display);
cairo_region_t *input_shape;
child->shape = NULL;
if (gdk_display_supports_shapes (display))
child->shape = _gdk_x11_xwindow_get_shape (display_x11->xdisplay,
child->xid, 1, ShapeBounding);
#ifdef ShapeInput
input_shape = NULL;
if (gdk_display_supports_input_shapes (display))
input_shape = _gdk_x11_xwindow_get_shape (display_x11->xdisplay,
child->xid, 1, ShapeInput);
if (child->shape && input_shape)
{
cairo_region_intersect (child->shape, input_shape);
cairo_region_destroy (input_shape);
}
else if (input_shape)
{
child->shape = input_shape;
}
#endif
child->shape_valid = TRUE;
}
return child->shape == NULL ||
cairo_region_contains_point (child->shape, x_pos, y_pos);
}
static Window
get_client_window_at_coords_recurse (GdkDisplay *display,
Window win,
gboolean is_toplevel,
gint x,
gint y)
{
GdkChildInfoX11 *children;
unsigned int nchildren;
int i;
gboolean found_child = FALSE;
GdkChildInfoX11 child = { 0, };
gboolean has_wm_state = FALSE;
if (!_gdk_x11_get_window_child_info (display, win, TRUE,
is_toplevel? &has_wm_state : NULL,
&children, &nchildren))
return None;
if (has_wm_state)
{
g_free (children);
return win;
}
for (i = nchildren - 1; (i >= 0) && !found_child; i--)
{
GdkChildInfoX11 *cur_child = &children[i];
if ((cur_child->is_mapped) && (cur_child->window_class == InputOutput) &&
(x >= cur_child->x) && (x < cur_child->x + cur_child->width) &&
(y >= cur_child->y) && (y < cur_child->y + cur_child->height))
{
x -= cur_child->x;
y -= cur_child->y;
child = *cur_child;
found_child = TRUE;
}
}
g_free (children);
if (found_child)
{
if (child.has_wm_state)
return child.window;
else
return get_client_window_at_coords_recurse (display, child.window, FALSE, x, y);
}
else
return None;
}
static Window
get_client_window_at_coords (GdkSurfaceCache *cache,
Window ignore,
gint x_root,
gint y_root)
{
GList *tmp_list;
Window retval = None;
GdkDisplay *display;
display = cache->display;
gdk_x11_display_error_trap_push (display);
tmp_list = cache->children;
while (tmp_list && !retval)
{
GdkCacheChild *child = tmp_list->data;
if ((child->xid != ignore) && (child->mapped))
{
if ((x_root >= child->x) && (x_root < child->x + child->width) &&
(y_root >= child->y) && (y_root < child->y + child->height))
{
if (!is_pointer_within_shape (display, child,
x_root - child->x,
y_root - child->y))
{
tmp_list = tmp_list->next;
continue;
}
retval = get_client_window_at_coords_recurse (display,
child->xid, TRUE,
x_root - child->x,
y_root - child->y);
if (!retval)
retval = child->xid;
}
}
tmp_list = tmp_list->next;
}
gdk_x11_display_error_trap_pop_ignored (display);
if (retval)
return retval;
else
return GDK_DISPLAY_XROOTWIN (display);
}
/*************************************************************
***************************** XDND **************************
*************************************************************/
/* Utility functions */
static struct {
const gchar *name;
GdkDragAction action;
} xdnd_actions_table[] = {
{ "XdndActionCopy", GDK_ACTION_COPY },
{ "XdndActionMove", GDK_ACTION_MOVE },
{ "XdndActionLink", GDK_ACTION_LINK },
{ "XdndActionAsk", GDK_ACTION_ASK },
{ "XdndActionPrivate", GDK_ACTION_COPY },
};
static const gint xdnd_n_actions = G_N_ELEMENTS (xdnd_actions_table);
static GdkDragAction
xdnd_action_from_atom (GdkDisplay *display,
Atom xatom)
{
const char *name;
gint i;
if (xatom == None)
return 0;
name = gdk_x11_get_xatom_name_for_display (display, xatom);
for (i = 0; i < xdnd_n_actions; i++)
if (g_str_equal (name, xdnd_actions_table[i].name))
return xdnd_actions_table[i].action;
return 0;
}
static Atom
xdnd_action_to_atom (GdkDisplay *display,
GdkDragAction action)
{
gint i;
for (i = 0; i < xdnd_n_actions; i++)
if (action == xdnd_actions_table[i].action)
return gdk_x11_get_xatom_by_name_for_display (display, xdnd_actions_table[i].name);
return None;
}
/* Source side */
void
gdk_x11_drag_handle_status (GdkDisplay *display,
const XEvent *xevent)
{
guint32 dest_surface = xevent->xclient.data.l[0];
guint32 flags = xevent->xclient.data.l[1];
Atom action = xevent->xclient.data.l[4];
GdkDrag *drag;
drag = gdk_x11_drag_find (display, xevent->xclient.window, dest_surface);
GDK_DISPLAY_NOTE (display, DND,
g_message ("XdndStatus: dest_surface: %#x action: %ld",
dest_surface, action));
if (drag)
{
GdkX11Drag *drag_x11 = GDK_X11_DRAG (drag);
if (drag_x11->drag_status == GDK_DRAG_STATUS_MOTION_WAIT)
drag_x11->drag_status = GDK_DRAG_STATUS_DRAG;
if (!(action != 0) != !(flags & 1))
{
GDK_DISPLAY_NOTE (display, DND,
g_warning ("Received status event with flags not corresponding to action!"));
action = 0;
}
gdk_drag_set_selected_action (drag, xdnd_action_from_atom (display, action));
drag_x11->current_action = action;
}
}
void
gdk_x11_drag_handle_finished (GdkDisplay *display,
const XEvent *xevent)
{
guint32 dest_surface = xevent->xclient.data.l[0];
GdkDrag *drag;
GdkX11Drag *drag_x11;
drag = gdk_x11_drag_find (display, xevent->xclient.window, dest_surface);
GDK_DISPLAY_NOTE (display, DND,
g_message ("XdndFinished: dest_surface: %#x", dest_surface));
if (drag)
{
drag_x11 = GDK_X11_DRAG (drag);
if (drag_x11->version == 5)
drag_x11->drop_failed = xevent->xclient.data.l[1] == 0;
g_signal_emit_by_name (drag, "dnd-finished");
gdk_drag_drop_done (drag, !drag_x11->drop_failed);
}
}
static void
xdnd_set_targets (GdkX11Drag *drag_x11)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
Atom *atomlist;
const char * const *atoms;
gsize i, n_atoms;
GdkDisplay *display = gdk_drag_get_display (drag);
atoms = gdk_content_formats_get_mime_types (gdk_drag_get_formats (drag), &n_atoms);
atomlist = g_new (Atom, n_atoms);
for (i = 0; i < n_atoms; i++)
atomlist[i] = gdk_x11_get_xatom_by_name_for_display (display, atoms[i]);
XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
GDK_SURFACE_XID (drag_x11->ipc_surface),
gdk_x11_get_xatom_by_name_for_display (display, "XdndTypeList"),
XA_ATOM, 32, PropModeReplace,
(guchar *)atomlist, n_atoms);
g_free (atomlist);
drag_x11->xdnd_targets_set = 1;
}
static void
xdnd_set_actions (GdkX11Drag *drag_x11)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
Atom *atomlist;
gint i;
gint n_atoms;
guint actions;
GdkDisplay *display = gdk_drag_get_display (drag);
actions = gdk_drag_get_actions (drag);
n_atoms = 0;
for (i = 0; i < xdnd_n_actions; i++)
{
if (actions & xdnd_actions_table[i].action)
{
actions &= ~xdnd_actions_table[i].action;
n_atoms++;
}
}
atomlist = g_new (Atom, n_atoms);
actions = gdk_drag_get_actions (drag);
n_atoms = 0;
for (i = 0; i < xdnd_n_actions; i++)
{
if (actions & xdnd_actions_table[i].action)
{
actions &= ~xdnd_actions_table[i].action;
atomlist[n_atoms] = gdk_x11_get_xatom_by_name_for_display (display, xdnd_actions_table[i].name);
n_atoms++;
}
}
XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
GDK_SURFACE_XID (drag_x11->ipc_surface),
gdk_x11_get_xatom_by_name_for_display (display, "XdndActionList"),
XA_ATOM, 32, PropModeReplace,
(guchar *)atomlist, n_atoms);
g_free (atomlist);
drag_x11->xdnd_actions = gdk_drag_get_actions (drag);
}
static void
send_client_message_async_cb (Window window,
gboolean success,
gpointer data)
{
GdkX11Drag *drag_x11 = data;
GdkDrag *drag = data;
GDK_DISPLAY_NOTE (gdk_drag_get_display (drag), DND,
g_message ("Got async callback for #%lx, success = %d",
window, success));
/* On failure, we immediately continue with the protocol
* so we don't end up blocking for a timeout
*/
if (!success &&
window == drag_x11->proxy_xid)
{
drag_x11->proxy_xid = None;
gdk_drag_set_selected_action (drag, 0);
drag_x11->current_action = 0;
drag_x11->drag_status = GDK_DRAG_STATUS_DRAG;
}
g_object_unref (drag);
}
static void
send_client_message_async (GdkDrag *drag,
Window window,
glong event_mask,
XClientMessageEvent *event_send)
{
GdkDisplay *display = gdk_drag_get_display (drag);
g_object_ref (drag);
_gdk_x11_send_client_message_async (display, window,
FALSE, event_mask, event_send,
send_client_message_async_cb, drag);
}
static void
xdnd_send_xevent (GdkX11Drag *drag_x11,
XEvent *event_send)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
GdkDisplay *display = gdk_drag_get_display (drag);
GdkSurface *surface;
glong event_mask;
g_assert (event_send->xany.type == ClientMessage);
/* We short-circuit messages to ourselves */
surface = gdk_x11_surface_lookup_for_display (display, drag_x11->proxy_xid);
if (surface)
{
if (gdk_x11_drop_filter (surface, event_send))
return;
}
if (_gdk_x11_display_is_root_window (display, drag_x11->proxy_xid))
event_mask = ButtonPressMask;
else
event_mask = 0;
send_client_message_async (drag, drag_x11->proxy_xid, event_mask,
&event_send->xclient);
}
static void
xdnd_send_enter (GdkX11Drag *drag_x11)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
GdkDisplay *display = gdk_drag_get_display (drag);
GdkContentFormats *formats;
const char * const *mime_types;
gsize i, n_mime_types;
XEvent xev;
xev.xclient.type = ClientMessage;
xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndEnter");
xev.xclient.format = 32;
xev.xclient.window = drag_x11->drop_xid
? drag_x11->drop_xid
: drag_x11->proxy_xid;
xev.xclient.data.l[0] = GDK_SURFACE_XID (drag_x11->ipc_surface);
xev.xclient.data.l[1] = (drag_x11->version << 24); /* version */
xev.xclient.data.l[2] = 0;
xev.xclient.data.l[3] = 0;
xev.xclient.data.l[4] = 0;
GDK_DISPLAY_NOTE (display, DND,
g_message ("Sending enter source window %#lx XDND protocol version %d\n",
GDK_SURFACE_XID (drag_x11->ipc_surface), drag_x11->version));
formats = gdk_content_formats_ref (gdk_drag_get_formats (drag));
formats = gdk_content_formats_union_serialize_mime_types (formats);
mime_types = gdk_content_formats_get_mime_types (formats, &n_mime_types);
if (n_mime_types > 3)
{
if (!drag_x11->xdnd_targets_set)
xdnd_set_targets (drag_x11);
xev.xclient.data.l[1] |= 1;
}
else
{
for (i = 0; i < n_mime_types; i++)
{
xev.xclient.data.l[i + 2] = gdk_x11_get_xatom_by_name_for_display (display, mime_types[i]);
}
}
xdnd_send_xevent (drag_x11, &xev);
}
static void
xdnd_send_leave (GdkX11Drag *drag_x11)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
GdkDisplay *display = gdk_drag_get_display (drag);
XEvent xev;
xev.xclient.type = ClientMessage;
xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndLeave");
xev.xclient.format = 32;
xev.xclient.window = drag_x11->drop_xid
? drag_x11->drop_xid
: drag_x11->proxy_xid;
xev.xclient.data.l[0] = GDK_SURFACE_XID (drag_x11->ipc_surface);
xev.xclient.data.l[1] = 0;
xev.xclient.data.l[2] = 0;
xev.xclient.data.l[3] = 0;
xev.xclient.data.l[4] = 0;
xdnd_send_xevent (drag_x11, &xev);
}
static void
xdnd_send_drop (GdkX11Drag *drag_x11,
guint32 time)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
GdkDisplay *display = gdk_drag_get_display (drag);
XEvent xev;
xev.xclient.type = ClientMessage;
xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndDrop");
xev.xclient.format = 32;
xev.xclient.window = drag_x11->drop_xid
? drag_x11->drop_xid
: drag_x11->proxy_xid;
xev.xclient.data.l[0] = GDK_SURFACE_XID (drag_x11->ipc_surface);
xev.xclient.data.l[1] = 0;
xev.xclient.data.l[2] = time;
xev.xclient.data.l[3] = 0;
xev.xclient.data.l[4] = 0;
xdnd_send_xevent (drag_x11, &xev);
}
static void
xdnd_send_motion (GdkX11Drag *drag_x11,
gint x_root,
gint y_root,
GdkDragAction action,
guint32 time)
{
GdkDrag *drag = GDK_DRAG (drag_x11);
GdkDisplay *display = gdk_drag_get_display (drag);
XEvent xev;
xev.xclient.type = ClientMessage;
xev.xclient.message_type = gdk_x11_get_xatom_by_name_for_display (display, "XdndPosition");
xev.xclient.format = 32;
xev.xclient.window = drag_x11->drop_xid
? drag_x11->drop_xid
: drag_x11->proxy_xid;
xev.xclient.data.l[0] = GDK_SURFACE_XID (drag_x11->ipc_surface);
xev.xclient.data.l[1] = 0;
xev.xclient.data.l[2] = (x_root << 16) | y_root;
xev.xclient.data.l[3] = time;
xev.xclient.data.l[4] = xdnd_action_to_atom (display, action);
xdnd_send_xevent (drag_x11, &xev);
drag_x11->drag_status = GDK_DRAG_STATUS_MOTION_WAIT;
}
static guint32
xdnd_check_dest (GdkDisplay *display,
Window win,
guint *xdnd_version)
{
gboolean retval = FALSE;
Atom type = None;
int format;
unsigned long nitems, after;
guchar *data;
Atom *version;
Window *proxy_data;
Window proxy;
Atom xdnd_proxy_atom = gdk_x11_get_xatom_by_name_for_display (display, "XdndProxy");
Atom xdnd_aware_atom = gdk_x11_get_xatom_by_name_for_display (display, "XdndAware");
proxy = None;
gdk_x11_display_error_trap_push (display);
if (XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), win,
xdnd_proxy_atom, 0,
1, False, AnyPropertyType,
&type, &format, &nitems, &after,
&data) == Success)
{
if (type != None)
{
proxy_data = (Window *)data;
if ((format == 32) && (nitems == 1))
{
proxy = *proxy_data;
}
else
{
GDK_DISPLAY_NOTE (display, DND,
g_warning ("Invalid XdndProxy property on window %ld", win));
}
XFree (proxy_data);
}
if ((XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), proxy ? proxy : win,
xdnd_aware_atom, 0,
1, False, AnyPropertyType,
&type, &format, &nitems, &after,
&data) == Success) &&
type != None)
{
version = (Atom *)data;
if ((format == 32) && (nitems == 1))
{
if (*version >= 3)
retval = TRUE;
if (xdnd_version)
*xdnd_version = *version;
}
else
{
GDK_DISPLAY_NOTE (display, DND,
g_warning ("Invalid XdndAware property on window %ld", win));
}
XFree (version);
}
}
gdk_x11_display_error_trap_pop_ignored (display);
return retval ? (proxy ? proxy : win) : None;
}
/* Source side */
static void
gdk_drag_do_leave (GdkX11Drag *drag_x11)
{
if (drag_x11->proxy_xid)
{
switch (drag_x11->protocol)
{
case GDK_DRAG_PROTO_XDND:
xdnd_send_leave (drag_x11);
break;
case GDK_DRAG_PROTO_ROOTWIN:
case GDK_DRAG_PROTO_NONE:
default:
break;
}
drag_x11->proxy_xid = None;
}
}
static GdkSurface *
create_drag_surface (GdkDisplay *display)
{
GdkSurface *surface;
surface = gdk_surface_new_temp (display, &(GdkRectangle) { 0, 0, 100, 100 });
return surface;
}
static Window
_gdk_x11_display_get_drag_protocol (GdkDisplay *display,
Window xid,
GdkDragProtocol *protocol,
guint *version)
{
GdkSurface *surface;
Window retval;
/* Check for a local drag */
surface = gdk_x11_surface_lookup_for_display (display, xid);
if (surface)
{
if (g_object_get_data (G_OBJECT (surface), "gdk-dnd-registered") != NULL)
{
*protocol = GDK_DRAG_PROTO_XDND;
*version = 5;
GDK_DISPLAY_NOTE (display, DND, g_message ("Entering local Xdnd window %#x\n", (guint) xid));
return xid;
}
else if (_gdk_x11_display_is_root_window (display, xid))
{
*protocol = GDK_DRAG_PROTO_ROOTWIN;
GDK_DISPLAY_NOTE (display, DND, g_message ("Entering root window\n"));
return xid;
}
}
else if ((retval = xdnd_check_dest (display, xid, version)))
{
*protocol = GDK_DRAG_PROTO_XDND;
GDK_DISPLAY_NOTE (display, DND, g_message ("Entering Xdnd window %#x\n", (guint) xid));
return retval;
}
else
{
/* Check if this is a root window */
gboolean rootwin = FALSE;
if (_gdk_x11_display_is_root_window (display, (Window) xid))
rootwin = TRUE;
if (rootwin)
{
GDK_DISPLAY_NOTE (display, DND, g_message ("Entering root window\n"));
*protocol = GDK_DRAG_PROTO_ROOTWIN;
return xid;
}
}
*protocol = GDK_DRAG_PROTO_NONE;
return 0; /* a.k.a. None */
}
static GdkSurfaceCache *
drag_find_window_cache (GdkX11Drag *drag_x11,
GdkDisplay *display)
{
if (!drag_x11->cache)
drag_x11->cache = gdk_surface_cache_get (display);
return drag_x11->cache;
}
static Window
gdk_x11_drag_find_surface (GdkDrag *drag,
GdkSurface *drag_surface,
gint x_root,
gint y_root,
GdkDragProtocol *protocol)
{
GdkX11Screen *screen_x11;
GdkX11Drag *drag_x11 = GDK_X11_DRAG (drag);
GdkSurfaceCache *window_cache;
GdkDisplay *display;
Window dest;
Window proxy;
display = gdk_drag_get_display (drag);
screen_x11 = GDK_X11_SCREEN(GDK_X11_DISPLAY (display)->screen);
window_cache = drag_find_window_cache (drag_x11, display);
dest = get_client_window_at_coords (window_cache,
drag_surface && GDK_IS_X11_SURFACE (drag_surface) ?
GDK_SURFACE_XID (drag_surface) : None,
x_root * screen_x11->surface_scale,
y_root * screen_x11->surface_scale);
if (drag_x11->dest_xid != dest)
{
drag_x11->dest_xid = dest;
/* Check if new destination accepts drags, and which protocol */
/* There is some ugliness here. We actually need to pass
* _three_ pieces of information to drag_motion - dest_surface,
* protocol, and the XID of the unproxied window. The first
* two are passed explicitly, the third implicitly through
* protocol->dest_xid.
*/
proxy = _gdk_x11_display_get_drag_protocol (display,
dest,
protocol,
&drag_x11->version);
}
else
{
proxy = dest;
*protocol = drag_x11->protocol;
}
return proxy;
}
static void
move_drag_surface (GdkDrag *drag,
guint x_root,
guint y_root)
{
GdkX11Drag *drag_x11 = GDK_X11_DRAG (drag);
gdk_x11_surface_move (drag_x11->drag_surface,
x_root - drag_x11->hot_x,
y_root - drag_x11->hot_y);
gdk_x11_surface_raise (drag_x11->drag_surface);
}
static gboolean
gdk_x11_drag_drag_motion (GdkDrag *drag,
Window proxy_xid,
GdkDragProtocol protocol,
gint x_root,
gint y_root,
GdkDragAction suggested_action,
GdkDragAction possible_actions,
guint32 time)
{
GdkX11Drag *drag_x11 = GDK_X11_DRAG (drag);
if (drag_x11->drag_surface)
move_drag_surface (drag, x_root, y_root);
gdk_drag_set_actions (drag, possible_actions);
if (protocol == GDK_DRAG_PROTO_XDND && drag_x11->version == 0)
{
/* This ugly hack is necessary since GTK+ doesn't know about
* the XDND protocol version, and in particular doesn't know
* that gdk_drag_find_window() has the side-effect
* of setting drag_x11->version, and therefore sometimes call
* gdk_x11_drag_drag_motion() without a prior call to
* gdk_drag_find_window(). This happens, e.g.
* when GTK+ is proxying DND events to embedded windows.
*/
if (proxy_xid)
{
GdkDisplay *display = gdk_drag_get_display (drag);
xdnd_check_dest (display,
proxy_xid,
&drag_x11->version);
}
}
if (drag_x11->proxy_xid != proxy_xid)
{
/* Send a leave to the last destination */
gdk_drag_do_leave (drag_x11);
drag_x11->drag_status = GDK_DRAG_STATUS_DRAG;
/* Check if new destination accepts drags, and which protocol */
if (proxy_xid)
{
drag_x11->proxy_xid = proxy_xid;
drag_x11->drop_xid = drag_x11->dest_xid;
drag_x11->protocol = protocol;
switch (protocol)
{
case GDK_DRAG_PROTO_XDND:
xdnd_send_enter (drag_x11);
break;
case GDK_DRAG_PROTO_ROOTWIN:
case GDK_DRAG_PROTO_NONE:
default:
break;
}
}
else
{
drag_x11->proxy_xid = None;
drag_x11->drop_xid = None;
gdk_drag_set_selected_action (drag, 0);
}
/* Push a status event, to let the client know that
* the drag changed
*/
drag_x11->current_action = gdk_drag_get_selected_action (drag);
}
/* When we have a Xdnd target, make sure our XdndActionList
* matches the current actions;
*/
if (protocol == GDK_DRAG_PROTO_XDND && drag_x11->xdnd_actions != gdk_drag_get_actions (drag))
{
if (proxy_xid)
{
GdkDisplay *display = gdk_drag_get_display (drag);
GdkDrop *drop = GDK_X11_DISPLAY (display)->current_drop;
if (drop && GDK_SURFACE_XID (gdk_drop_get_surface (drop)) == proxy_xid)
gdk_x11_drop_read_actions (drop);
else
xdnd_set_actions (drag_x11);
}
}
/* Send a drag-motion event */
drag_x11->last_x = x_root;
drag_x11->last_y = y_root;
if (drag_x11->proxy_xid)
{
GdkDisplay *display = gdk_drag_get_display (drag);
GdkX11Screen *screen_x11 = GDK_X11_SCREEN(GDK_X11_DISPLAY (display)->screen);
if (drag_x11->drag_status == GDK_DRAG_STATUS_DRAG)
{
switch (drag_x11->protocol)
{
case GDK_DRAG_PROTO_XDND:
xdnd_send_motion (drag_x11, x_root * screen_x11->surface_scale, y_root * screen_x11->surface_scale, suggested_action, time);
break;
case GDK_DRAG_PROTO_ROOTWIN:
{
GdkContentFormats *formats = gdk_drag_get_formats (drag);
/* GTK+ traditionally has used application/x-rootwin-drop,
* but the XDND spec specifies x-rootwindow-drop.
*/
if (gdk_content_formats_contain_mime_type (formats, "application/x-rootwindow-drop") ||
gdk_content_formats_contain_mime_type (formats, "application/x-rootwin-drop"))
gdk_drag_set_selected_action (drag, suggested_action);
else
gdk_drag_set_selected_action (drag, 0);
drag_x11->current_action = gdk_drag_get_selected_action (drag);
}
break;
case GDK_DRAG_PROTO_NONE:
g_warning ("Invalid drag protocol %u in gdk_x11_drag_drag_motion()", drag_x11->protocol);
break;
default:
break;
}
}
else
return TRUE;
}
return FALSE;
}
static void
gdk_x11_drag_drop (GdkDrag *drag,
guint32 time)
{
GdkX11Drag *drag_x11 = GDK_X11_DRAG (drag);
if (drag_x11->proxy_xid)
{
switch (drag_x11->protocol)
{
case GDK_DRAG_PROTO_XDND:
xdnd_send_drop (drag_x11, time);
break;
case GDK_DRAG_PROTO_ROOTWIN:
g_warning ("Drops for GDK_DRAG_PROTO_ROOTWIN must be handled internally");
break;
case GDK_DRAG_PROTO_NONE:
g_warning ("GDK_DRAG_PROTO_NONE is not valid in gdk_drag_drop()");
break;
default:
g_warning ("Drag protocol %u is not valid in gdk_drag_drop()", drag_x11->protocol);
break;
}
}
}
/* Destination side */
void
_gdk_x11_surface_register_dnd (GdkSurface *surface)
{
static const gulong xdnd_version = 5;
GdkDisplay *display = gdk_surface_get_display (surface);
g_return_if_fail (surface != NULL);
if (g_object_get_data (G_OBJECT (surface), "gdk-dnd-registered") != NULL)
return;
else
g_object_set_data (G_OBJECT (surface), "gdk-dnd-registered", GINT_TO_POINTER (TRUE));
/* Set XdndAware */
/* The property needs to be of type XA_ATOM, not XA_INTEGER. Blech */
XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
GDK_SURFACE_XID (surface),
gdk_x11_get_xatom_by_name_for_display (display, "XdndAware"),
XA_ATOM, 32, PropModeReplace,
(guchar *)&xdnd_version, 1);
}
static GdkSurface *
gdk_x11_drag_get_drag_surface (GdkDrag *drag)
{
return GDK_X11_DRAG (drag)->drag_surface;
}
static void
gdk_x11_drag_set_hotspot (GdkDrag *drag,
gint hot_x,
gint hot_y)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
x11_drag->hot_x = hot_x;
x11_drag->hot_y = hot_y;
if (x11_drag->grab_seat)
{
/* DnD is managed, update current position */
move_drag_surface (drag, x11_drag->last_x, x11_drag->last_y);
}
}
static void
gdk_x11_drag_default_output_done (GObject *drag,
GAsyncResult *result,
gpointer user_data)
{
GError *error = NULL;
if (!gdk_drag_write_finish (GDK_DRAG (drag), result, &error))
{
GDK_DISPLAY_NOTE (gdk_drag_get_display (GDK_DRAG (drag)), DND, g_printerr ("failed to write stream: %s\n", error->message));
g_error_free (error);
}
}
static void
gdk_x11_drag_default_output_handler (GOutputStream *stream,
const char *mime_type,
gpointer user_data)
{
gdk_drag_write_async (GDK_DRAG (user_data),
mime_type,
stream,
G_PRIORITY_DEFAULT,
NULL,
gdk_x11_drag_default_output_done,
NULL);
g_object_unref (stream);
}
static gboolean
gdk_x11_drag_xevent (GdkDisplay *display,
const XEvent *xevent,
gpointer data)
{
GdkDrag *drag = GDK_DRAG (data);
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
Window xwindow;
Atom xselection;
xwindow = GDK_SURFACE_XID (x11_drag->ipc_surface);
xselection = gdk_x11_get_xatom_by_name_for_display (display, "XdndSelection");
if (xevent->xany.window != xwindow)
return FALSE;
switch (xevent->type)
{
case SelectionClear:
if (xevent->xselectionclear.selection != xselection)
return FALSE;
if (xevent->xselectionclear.time < x11_drag->timestamp)
{
GDK_DISPLAY_NOTE (display, CLIPBOARD, g_printerr ("ignoring SelectionClear with too old timestamp (%lu vs %lu)\n",
xevent->xselectionclear.time, x11_drag->timestamp));
return FALSE;
}
GDK_DISPLAY_NOTE (display, CLIPBOARD, g_printerr ("got SelectionClear, aborting DND\n"));
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_ERROR);
return TRUE;
case SelectionRequest:
{
#ifdef G_ENABLE_DEBUG
const char *target, *property;
#endif
if (xevent->xselectionrequest.selection != xselection)
return FALSE;
#ifdef G_ENABLE_DEBUG
target = gdk_x11_get_xatom_name_for_display (display, xevent->xselectionrequest.target);
if (xevent->xselectionrequest.property == None)
property = target;
else
property = gdk_x11_get_xatom_name_for_display (display, xevent->xselectionrequest.property);
#endif
if (xevent->xselectionrequest.requestor == None)
{
GDK_DISPLAY_NOTE (display, CLIPBOARD, g_printerr ("got SelectionRequest for %s @ %s with NULL window, ignoring\n",
target, property));
return TRUE;
}
GDK_DISPLAY_NOTE (display, CLIPBOARD, g_printerr ("got SelectionRequest for %s @ %s\n",
target, property));
gdk_x11_selection_output_streams_create (display,
gdk_drag_get_formats (drag),
xevent->xselectionrequest.requestor,
xevent->xselectionrequest.selection,
xevent->xselectionrequest.target,
xevent->xselectionrequest.property ? xevent->xselectionrequest.property
: xevent->xselectionrequest.target,
xevent->xselectionrequest.time,
gdk_x11_drag_default_output_handler,
drag);
return TRUE;
}
case ClientMessage:
if (xevent->xclient.message_type == gdk_x11_get_xatom_by_name_for_display (display, "XdndStatus"))
gdk_x11_drag_handle_status (display, xevent);
else if (xevent->xclient.message_type == gdk_x11_get_xatom_by_name_for_display (display, "XdndFinished"))
gdk_x11_drag_handle_finished (display, xevent);
else
return FALSE;
return TRUE;
default:
return FALSE;
}
}
static double
ease_out_cubic (double t)
{
double p = t - 1;
return p * p * p + 1;
}
#define ANIM_TIME 500000 /* half a second */
typedef struct _GdkDragAnim GdkDragAnim;
struct _GdkDragAnim {
GdkX11Drag *drag;
GdkFrameClock *frame_clock;
gint64 start_time;
};
static void
gdk_drag_anim_destroy (GdkDragAnim *anim)
{
gdk_surface_hide (anim->drag->drag_surface);
g_object_unref (anim->drag);
g_slice_free (GdkDragAnim, anim);
}
static gboolean
gdk_drag_anim_timeout (gpointer data)
{
GdkDragAnim *anim = data;
GdkX11Drag *drag = anim->drag;
GdkFrameClock *frame_clock = anim->frame_clock;
gint64 current_time;
double f;
double t;
if (!frame_clock)
return G_SOURCE_REMOVE;
current_time = gdk_frame_clock_get_frame_time (frame_clock);
f = (current_time - anim->start_time) / (double) ANIM_TIME;
if (f >= 1.0)
return G_SOURCE_REMOVE;
t = ease_out_cubic (f);
gdk_x11_surface_show (drag->drag_surface, FALSE);
gdk_x11_surface_move (drag->drag_surface,
(drag->last_x - drag->hot_x) +
(drag->start_x - drag->last_x) * t,
(drag->last_y - drag->hot_y) +
(drag->start_y - drag->last_y) * t);
gdk_x11_surface_set_opacity (drag->drag_surface, 1.0 - f);
return G_SOURCE_CONTINUE;
}
static void
gdk_x11_drag_release_selection (GdkDrag *drag)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
GdkDisplay *display;
Display *xdisplay;
Window xwindow;
Atom xselection;
display = gdk_drag_get_display (drag);
xdisplay = GDK_DISPLAY_XDISPLAY (display);
xselection = gdk_x11_get_xatom_by_name_for_display (display, "XdndSelection");
xwindow = GDK_SURFACE_XID (x11_drag->ipc_surface);
if (XGetSelectionOwner (xdisplay, xselection) == xwindow)
XSetSelectionOwner (xdisplay, xselection, None, CurrentTime);
}
static void
gdk_x11_drag_drop_done (GdkDrag *drag,
gboolean success)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
GdkDragAnim *anim;
/*
cairo_surface_t *win_surface;
cairo_surface_t *surface;
cairo_t *cr;
*/
guint id;
gdk_x11_drag_release_selection (drag);
g_signal_handlers_disconnect_by_func (gdk_drag_get_display (drag),
gdk_x11_drag_xevent,
drag);
if (success)
{
gdk_surface_hide (x11_drag->drag_surface);
g_object_unref (drag);
return;
}
/*
win_surface = _gdk_surface_ref_cairo_surface (x11_drag->drag_surface);
surface = gdk_surface_create_similar_surface (x11_drag->drag_surface,
cairo_surface_get_content (win_surface),
gdk_surface_get_width (x11_drag->drag_surface),
gdk_surface_get_height (x11_drag->drag_surface));
cr = cairo_create (surface);
cairo_set_source_surface (cr, win_surface, 0, 0);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (win_surface);
pattern = cairo_pattern_create_for_surface (surface);
gdk_surface_set_background_pattern (x11_drag->drag_surface, pattern);
cairo_pattern_destroy (pattern);
cairo_surface_destroy (surface);
*/
anim = g_slice_new0 (GdkDragAnim);
anim->drag = g_object_ref (x11_drag);
anim->frame_clock = gdk_surface_get_frame_clock (x11_drag->drag_surface);
anim->start_time = gdk_frame_clock_get_frame_time (anim->frame_clock);
id = g_timeout_add_full (G_PRIORITY_DEFAULT, 17,
gdk_drag_anim_timeout, anim,
(GDestroyNotify) gdk_drag_anim_destroy);
g_source_set_name_by_id (id, "[gtk] gdk_drag_anim_timeout");
g_object_unref (drag);
}
static gboolean
drag_grab (GdkDrag *drag)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
GdkSeatCapabilities capabilities;
GdkDisplay *display;
Window root;
GdkSeat *seat;
gint keycode, i;
GdkCursor *cursor;
if (!x11_drag->ipc_surface)
return FALSE;
display = gdk_drag_get_display (drag);
root = GDK_DISPLAY_XROOTWIN (display);
seat = gdk_device_get_seat (gdk_drag_get_device (drag));
capabilities = GDK_SEAT_CAPABILITY_ALL_POINTING;
cursor = gdk_drag_get_cursor (drag, x11_drag->current_action);
g_set_object (&x11_drag->cursor, cursor);
if (gdk_seat_grab (seat, x11_drag->ipc_surface,
capabilities, FALSE,
x11_drag->cursor, NULL, NULL, NULL) != GDK_GRAB_SUCCESS)
return FALSE;
g_set_object (&x11_drag->grab_seat, seat);
gdk_x11_display_error_trap_push (display);
for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
{
gint deviceid = gdk_x11_device_get_id (gdk_seat_get_keyboard (seat));
unsigned char mask[XIMaskLen(XI_LASTEVENT)];
XIGrabModifiers mods;
XIEventMask evmask;
gint num_mods;
keycode = XKeysymToKeycode (GDK_DISPLAY_XDISPLAY (display),
grab_keys[i].keysym);
if (keycode == NoSymbol)
continue;
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_DISPLAY_XDISPLAY (display),
deviceid,
keycode,
root,
GrabModeAsync,
GrabModeAsync,
False,
&evmask,
num_mods,
&mods);
}
gdk_x11_display_error_trap_pop_ignored (display);
return TRUE;
}
static void
drag_ungrab (GdkDrag *drag)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
GdkDisplay *display;
GdkDevice *keyboard;
Window root;
gint keycode, i;
if (!x11_drag->grab_seat)
return;
gdk_seat_ungrab (x11_drag->grab_seat);
display = gdk_drag_get_display (drag);
keyboard = gdk_seat_get_keyboard (x11_drag->grab_seat);
root = GDK_DISPLAY_XROOTWIN (display);
g_clear_object (&x11_drag->grab_seat);
for (i = 0; i < G_N_ELEMENTS (grab_keys); ++i)
{
XIGrabModifiers mods;
gint num_mods;
keycode = XKeysymToKeycode (GDK_DISPLAY_XDISPLAY (display),
grab_keys[i].keysym);
if (keycode == NoSymbol)
continue;
num_mods = 1;
mods.modifiers = grab_keys[i].modifiers;
XIUngrabKeycode (GDK_DISPLAY_XDISPLAY (display),
gdk_x11_device_get_id (keyboard),
keycode,
root,
num_mods,
&mods);
}
}
GdkDrag *
_gdk_x11_surface_drag_begin (GdkSurface *surface,
GdkDevice *device,
GdkContentProvider *content,
GdkDragAction actions,
gint dx,
gint dy)
{
GdkX11Drag *x11_drag;
GdkDrag *drag;
GdkDisplay *display;
double px, py;
int x_root, y_root;
Atom xselection;
GdkSurface *ipc_surface;
display = gdk_surface_get_display (surface);
ipc_surface = gdk_surface_new_temp (display, &(GdkRectangle) { -99, -99, 1, 1 });
drag = (GdkDrag *) g_object_new (GDK_TYPE_X11_DRAG,
"surface", ipc_surface,
"device", device,
"content", content,
"actions", actions,
NULL);
x11_drag = GDK_X11_DRAG (drag);
precache_target_list (drag);
_gdk_device_query_state (device, surface, NULL, &px, &py, NULL);
gdk_x11_surface_get_root_coords (surface,
round (px) + dx,
round (py) + dy,
&x_root,
&y_root);
x11_drag->start_x = x_root;
x11_drag->start_y = y_root;
x11_drag->last_x = x_root;
x11_drag->last_y = y_root;
x11_drag->protocol = GDK_DRAG_PROTO_XDND;
x11_drag->actions = actions;
x11_drag->ipc_surface = ipc_surface;
if (gdk_x11_surface_get_group (surface))
gdk_x11_surface_set_group (x11_drag->ipc_surface, surface);
gdk_x11_surface_show (x11_drag->ipc_surface, FALSE);
x11_drag->drag_surface = create_drag_surface (display);
if (!drag_grab (drag))
{
g_object_unref (drag);
return NULL;
}
move_drag_surface (drag, x_root, y_root);
x11_drag->timestamp = gdk_display_get_last_seen_time (display);
xselection = gdk_x11_get_xatom_by_name_for_display (display, "XdndSelection");
XSetSelectionOwner (GDK_DISPLAY_XDISPLAY (display),
xselection,
GDK_SURFACE_XID (x11_drag->ipc_surface),
x11_drag->timestamp);
if (XGetSelectionOwner (GDK_DISPLAY_XDISPLAY (display), xselection) != GDK_SURFACE_XID (x11_drag->ipc_surface))
{
GDK_DISPLAY_NOTE (display, DND, g_printerr ("failed XSetSelectionOwner() on \"XdndSelection\", aborting DND\n"));
g_object_unref (drag);
return NULL;
}
g_signal_connect_object (display, "xevent", G_CALLBACK (gdk_x11_drag_xevent), drag, 0);
/* backend holds a ref until gdk_drag_drop_done is called */
g_object_ref (drag);
return drag;
}
static void
gdk_x11_drag_set_cursor (GdkDrag *drag,
GdkCursor *cursor)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
if (!g_set_object (&x11_drag->cursor, cursor))
return;
if (x11_drag->grab_seat)
{
G_GNUC_BEGIN_IGNORE_DEPRECATIONS;
gdk_device_grab (gdk_seat_get_pointer (x11_drag->grab_seat),
x11_drag->ipc_surface,
GDK_OWNERSHIP_APPLICATION, FALSE,
GDK_POINTER_MOTION_MASK | GDK_BUTTON_RELEASE_MASK,
cursor, GDK_CURRENT_TIME);
G_GNUC_END_IGNORE_DEPRECATIONS;
}
}
static void
gdk_x11_drag_cancel (GdkDrag *drag,
GdkDragCancelReason reason)
{
gdk_drag_do_leave (GDK_X11_DRAG (drag));
drag_ungrab (drag);
gdk_drag_drop_done (drag, FALSE);
}
static void
gdk_x11_drag_drop_performed (GdkDrag *drag,
guint32 time_)
{
gdk_x11_drag_drop (drag, time_);
drag_ungrab (drag);
}
#define BIG_STEP 20
#define SMALL_STEP 1
static void
gdk_drag_get_current_actions (GdkModifierType state,
gint button,
GdkDragAction actions,
GdkDragAction *suggested_action,
GdkDragAction *possible_actions)
{
*suggested_action = 0;
*possible_actions = 0;
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_ALT_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;
}
}
static void
gdk_drag_update (GdkDrag *drag,
gdouble x_root,
gdouble y_root,
GdkModifierType mods,
guint32 evtime)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
GdkDragAction suggested_action;
GdkDragAction possible_actions;
GdkDragProtocol protocol;
Window proxy;
gdk_drag_get_current_actions (mods, GDK_BUTTON_PRIMARY, x11_drag->actions,
&suggested_action, &possible_actions);
proxy = gdk_x11_drag_find_surface (drag,
x11_drag->drag_surface,
x_root, y_root, &protocol);
gdk_x11_drag_drag_motion (drag, proxy, protocol, x_root, y_root,
suggested_action, possible_actions, evtime);
}
static gboolean
gdk_dnd_handle_motion_event (GdkDrag *drag,
GdkEvent *event)
{
double x, y;
int x_root, y_root;
gdk_event_get_position (event, &x, &y);
x_root = event->surface->x + x;
y_root = event->surface->y + y;
gdk_drag_update (drag, x_root, y_root,
gdk_event_get_modifier_state (event),
gdk_event_get_time (event));
return TRUE;
}
static gboolean
gdk_dnd_handle_key_event (GdkDrag *drag,
GdkEvent *event)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
GdkModifierType state;
GdkDevice *pointer;
gint dx, dy;
dx = dy = 0;
state = gdk_event_get_modifier_state (event);
pointer = gdk_device_get_associated_device (gdk_event_get_device (event));
if (event->event_type == GDK_KEY_PRESS)
{
guint keyval = gdk_key_event_get_keyval (event);
switch (keyval)
{
case GDK_KEY_Escape:
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_USER_CANCELLED);
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_get_selected_action (drag) != 0) &&
(x11_drag->proxy_xid != None))
{
g_signal_emit_by_name (drag, "drop-performed");
}
else
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_NO_TARGET);
return TRUE;
case GDK_KEY_Up:
case GDK_KEY_KP_Up:
dy = (state & GDK_ALT_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_KEY_Down:
case GDK_KEY_KP_Down:
dy = (state & GDK_ALT_MASK) ? BIG_STEP : SMALL_STEP;
break;
case GDK_KEY_Left:
case GDK_KEY_KP_Left:
dx = (state & GDK_ALT_MASK) ? -BIG_STEP : -SMALL_STEP;
break;
case GDK_KEY_Right:
case GDK_KEY_KP_Right:
dx = (state & GDK_ALT_MASK) ? BIG_STEP : SMALL_STEP;
break;
default:
break;
}
}
/* 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.
*/
_gdk_device_query_state (pointer, NULL, NULL, NULL, NULL, &state);
if (dx != 0 || dy != 0)
{
GdkDisplay *display;
Display *xdisplay;
GdkX11Screen *screen;
Window dest;
x11_drag->last_x += dx;
x11_drag->last_y += dy;
display = gdk_event_get_display ((GdkEvent *)event);
xdisplay = GDK_DISPLAY_XDISPLAY (display);
screen = GDK_X11_DISPLAY (display)->screen;
dest = GDK_SCREEN_XROOTWIN (screen);
XWarpPointer (xdisplay, None, dest, 0, 0, 0, 0,
round (x11_drag->last_x * screen->surface_scale),
round (x11_drag->last_y * screen->surface_scale));
}
gdk_drag_update (drag, x11_drag->last_x, x11_drag->last_y, state,
gdk_event_get_time (event));
return TRUE;
}
static gboolean
gdk_dnd_handle_grab_broken_event (GdkDrag *drag,
GdkEvent *event)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
gboolean is_implicit = gdk_grab_broken_event_get_implicit (event);
GdkSurface *grab_surface = gdk_grab_broken_event_get_grab_surface (event);
/* 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 (is_implicit ||
grab_surface == x11_drag->drag_surface ||
grab_surface == x11_drag->ipc_surface)
return FALSE;
if (gdk_event_get_device (event) != gdk_drag_get_device (drag))
return FALSE;
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_ERROR);
return TRUE;
}
static gboolean
gdk_dnd_handle_button_event (GdkDrag *drag,
GdkEvent *event)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
#if 0
/* FIXME: Check the button matches */
if (event->button != x11_drag->button)
return FALSE;
#endif
if ((gdk_drag_get_selected_action (drag) != 0) &&
(x11_drag->proxy_xid != None))
{
g_signal_emit_by_name (drag, "drop-performed");
}
else
gdk_drag_cancel (drag, GDK_DRAG_CANCEL_NO_TARGET);
return TRUE;
}
gboolean
gdk_x11_drag_handle_event (GdkDrag *drag,
GdkEvent *event)
{
GdkX11Drag *x11_drag = GDK_X11_DRAG (drag);
if (!x11_drag->grab_seat)
return FALSE;
switch ((guint) event->event_type)
{
case GDK_MOTION_NOTIFY:
return gdk_dnd_handle_motion_event (drag, event);
case GDK_BUTTON_RELEASE:
return gdk_dnd_handle_button_event (drag, event);
case GDK_KEY_PRESS:
case GDK_KEY_RELEASE:
return gdk_dnd_handle_key_event (drag, event);
case GDK_GRAB_BROKEN:
return gdk_dnd_handle_grab_broken_event (drag, event);
default:
break;
}
return FALSE;
}
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