void
meta_core_lower_beneath_grab_window (Display *xdisplay,
Window xwindow,
guint32 timestamp)
{
XWindowChanges changes;
MetaDisplay *display;
MetaScreen *screen;
MetaWindow *grab_window;
display = meta_display_for_x_display (xdisplay);
screen = meta_display_screen_for_xwindow (display, xwindow);
grab_window = display->grab_window;
if (grab_window == NULL)
return;
changes.stack_mode = Below;
changes.sibling = grab_window->frame ? grab_window->frame->xwindow
: grab_window->xwindow;
meta_stack_tracker_record_lower_below (screen->stack_tracker,
xwindow,
changes.sibling,
XNextRequest (screen->display->xdisplay));
meta_error_trap_push (display);
XConfigureWindow (xdisplay,
xwindow,
CWSibling | CWStackMode,
&changes);
meta_error_trap_pop (display);
}
LOCAL_SYMBOL void
meta_core_lower_beneath_sibling (Display *xdisplay,
Window xwindow,
Window grab_window,
guint32 timestamp)
{
XWindowChanges changes;
MetaDisplay *display;
MetaScreen *screen;
display = meta_display_for_x_display (xdisplay);
screen = meta_display_screen_for_xwindow (display, xwindow);
changes.stack_mode = Below;
changes.sibling = grab_window;
meta_stack_tracker_record_lower_below (screen->stack_tracker,
xwindow,
changes.sibling,
XNextRequest (screen->display->xdisplay));
meta_error_trap_push (display);
XConfigureWindow (xdisplay,
xwindow,
CWSibling | CWStackMode,
&changes);
meta_error_trap_pop (display);
}
void
meta_stack_tracker_record_restack_windows (MetaStackTracker *tracker,
Window *windows,
int n_windows,
gulong serial)
{
int i;
/* XRestackWindows() isn't actually a X requests - it's broken down
* by XLib into a series of XConfigureWindow(StackMode=below); we
* mirror that exactly here.
*
* Aside: Having a separate StackOp for this would be possible to
* get some extra efficiency in memory allocation and in applying
* the op, at the expense of a code complexity. Implementation hint
* for that - keep op->restack_window.n_complete, and when receiving
* events with intermediate serials, set n_complete rather than
* removing the op from the queue.
*/
for (i = 0; i < n_windows - 1; i++)
meta_stack_tracker_record_lower_below (tracker, windows[i + 1], windows[i],
serial + i);
}
/*
* Order the windows on the X server to be the same as in our structure.
* We do this using XRestackWindows if we don't know the previous order,
* or XConfigureWindow on a few particular windows if we do and can figure
* out the minimum set of changes. After that, we set __NET_CLIENT_LIST
* and __NET_CLIENT_LIST_STACKING.
*
* FIXME: Now that we have a good view of the stacking order on the server
* with MetaStackTracker it should be possible to do a simpler and better
* job of computing the minimal set of stacking requests needed.
*/
static void
stack_sync_to_server (MetaStack *stack)
{
GArray *stacked;
GArray *root_children_stacked;
GList *tmp;
GArray *all_hidden;
int n_override_redirect = 0;
int n_unmanaging = 0;
/* Bail out if frozen */
if (stack->freeze_count > 0)
return;
meta_topic (META_DEBUG_STACK, "Syncing window stack to server\n");
stack_ensure_sorted (stack);
/* Create stacked xwindow arrays.
* Painfully, "stacked" is in bottom-to-top order for the
* _NET hints, and "root_children_stacked" is in top-to-bottom
* order for XRestackWindows()
*/
stacked = g_array_new (FALSE, FALSE, sizeof (Window));
root_children_stacked = g_array_new (FALSE, FALSE, sizeof (Window));
all_hidden = g_array_new (FALSE, FALSE, sizeof (Window));
/* The screen guard window sits above all hidden windows and acts as
* a barrier to input reaching these windows. */
g_array_append_val (all_hidden, stack->screen->guard_window);
meta_topic (META_DEBUG_STACK, "Top to bottom: ");
meta_push_no_msg_prefix ();
for (tmp = stack->sorted; tmp != NULL; tmp = tmp->next)
{
MetaWindow *w = tmp->data;
Window top_level_window;
if (w->unmanaging)
{
n_unmanaging ++;
continue;
}
meta_topic (META_DEBUG_STACK, "%u:%d - %s ",
w->layer, w->stack_position, w->desc);
/* remember, stacked is in reverse order (bottom to top) */
if (w->override_redirect)
n_override_redirect++;
else
g_array_prepend_val (stacked, w->xwindow);
if (w->frame)
top_level_window = w->frame->xwindow;
else
top_level_window = w->xwindow;
/* We don't restack hidden windows along with the rest, though they are
* reflected in the _NET hints. Hidden windows all get pushed below
* the screens fullscreen guard_window. */
if (w->hidden)
{
g_array_append_val (all_hidden, top_level_window);
continue;
}
/* build XRestackWindows() array from top to bottom */
g_array_append_val (root_children_stacked, top_level_window);
}
meta_topic (META_DEBUG_STACK, "\n");
meta_pop_no_msg_prefix ();
/* All windows should be in some stacking order */
if (stacked->len != stack->windows->len - n_override_redirect - n_unmanaging)
meta_bug ("%u windows stacked, %u windows exist in stack\n",
stacked->len, stack->windows->len);
/* Sync to server */
meta_topic (META_DEBUG_STACK, "Restacking %u windows\n",
root_children_stacked->len);
meta_error_trap_push (stack->screen->display);
if (stack->last_root_children_stacked == NULL)
{
/* Just impose our stack, we don't know the previous state.
* This involves a ton of circulate requests and may flicker.
*/
meta_topic (META_DEBUG_STACK, "Don't know last stack state, restacking everything\n");
if (root_children_stacked->len > 0)
{
meta_stack_tracker_record_restack_windows (stack->screen->stack_tracker,
(Window *) root_children_stacked->data,
root_children_stacked->len,
XNextRequest (stack->screen->display->xdisplay));
XRestackWindows (stack->screen->display->xdisplay,
(Window *) root_children_stacked->data,
root_children_stacked->len);
}
}
else if (root_children_stacked->len > 0)
{
/* Try to do minimal window moves to get the stack in order */
/* A point of note: these arrays include frames not client windows,
* so if a client window has changed frame since last_root_children_stacked
* was saved, then we may have inefficiency, but I don't think things
* break...
*/
const Window *old_stack = (Window *) stack->last_root_children_stacked->data;
const Window *new_stack = (Window *) root_children_stacked->data;
const int old_len = stack->last_root_children_stacked->len;
const int new_len = root_children_stacked->len;
const Window *oldp = old_stack;
const Window *newp = new_stack;
const Window *old_end = old_stack + old_len;
const Window *new_end = new_stack + new_len;
Window last_window = None;
while (oldp != old_end &&
newp != new_end)
{
if (*oldp == *newp)
{
/* Stacks are the same here, move on */
++oldp;
last_window = *newp;
++newp;
}
else if (meta_display_lookup_x_window (stack->screen->display,
*oldp) == NULL)
{
/* *oldp is no longer known to us (probably destroyed),
* so we can just skip it
*/
++oldp;
}
else
{
/* Move *newp below last_window */
if (last_window == None)
{
meta_topic (META_DEBUG_STACK, "Using window 0x%lx as topmost (but leaving it in-place)\n", *newp);
raise_window_relative_to_managed_windows (stack->screen,
*newp);
}
else
{
/* This means that if last_window is dead, but not
* *newp, then we fail to restack *newp; but on
* unmanaging last_window, we'll fix it up.
*/
XWindowChanges changes;
changes.sibling = last_window;
changes.stack_mode = Below;
meta_topic (META_DEBUG_STACK, "Placing window 0x%lx below 0x%lx\n",
*newp, last_window);
meta_stack_tracker_record_lower_below (stack->screen->stack_tracker,
*newp, last_window,
XNextRequest (stack->screen->display->xdisplay));
XConfigureWindow (stack->screen->display->xdisplay,
*newp,
CWSibling | CWStackMode,
&changes);
}
last_window = *newp;
++newp;
}
}
if (newp != new_end)
{
/* Restack remaining windows */
meta_topic (META_DEBUG_STACK, "Restacking remaining %d windows\n",
(int) (new_end - newp));
/* We need to include an already-stacked window
* in the restack call, so we get in the proper position
* with respect to it.
*/
if (newp != new_stack)
--newp;
meta_stack_tracker_record_restack_windows (stack->screen->stack_tracker,
(Window *) newp, new_end - newp,
XNextRequest (stack->screen->display->xdisplay));
XRestackWindows (stack->screen->display->xdisplay,
(Window *) newp, new_end - newp);
}
}
/* Push hidden windows to the bottom of the stack under the guard window */
meta_stack_tracker_record_lower (stack->screen->stack_tracker,
stack->screen->guard_window,
XNextRequest (stack->screen->display->xdisplay));
XLowerWindow (stack->screen->display->xdisplay, stack->screen->guard_window);
meta_stack_tracker_record_restack_windows (stack->screen->stack_tracker,
(Window *)all_hidden->data,
all_hidden->len,
XNextRequest (stack->screen->display->xdisplay));
XRestackWindows (stack->screen->display->xdisplay,
(Window *)all_hidden->data,
all_hidden->len);
g_array_free (all_hidden, TRUE);
meta_error_trap_pop (stack->screen->display);
/* on error, a window was destroyed; it should eventually
* get removed from the stacking list when we unmanage it
* and we'll fix stacking at that time.
*/
/* Sync _NET_CLIENT_LIST and _NET_CLIENT_LIST_STACKING */
XChangeProperty (stack->screen->display->xdisplay,
stack->screen->xroot,
stack->screen->display->atom__NET_CLIENT_LIST,
XA_WINDOW,
32, PropModeReplace,
(unsigned char *)stack->windows->data,
stack->windows->len);
XChangeProperty (stack->screen->display->xdisplay,
stack->screen->xroot,
stack->screen->display->atom__NET_CLIENT_LIST_STACKING,
XA_WINDOW,
32, PropModeReplace,
(unsigned char *)stacked->data,
stacked->len);
g_array_free (stacked, TRUE);
if (stack->last_root_children_stacked)
g_array_free (stack->last_root_children_stacked, TRUE);
stack->last_root_children_stacked = root_children_stacked;
/* That was scary... */
}
