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Move logic for syncing the stack to the X server into MetaStackTracker

Browse Source 
stack.c:sync_stack_to_xserver had both code for assembling the desired stack, and
code for enforcing the desired stack on the actual stack of X and Wayland windows;
the latter part is properly the domain of stack-tracker.c; moving the code to
apply the stack there both simplifies it and keeps stack.c more manageable.

https://bugzilla.gnome.org/show_bug.cgi?id=736559
This commit is contained in:
Owen W. Taylor 2014-09-10 11:58:42 -04:00
parent 301acac163
commit 04bc846ef3
3 changed files with 108 additions and 265 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

107
src/core/stack-tracker.c
View File

@ -816,9 +816,6 @@ meta_stack_tracker_get_stack (MetaStackTracker *tracker,
stack = tracker->predicted_stack;
}
meta_topic (META_DEBUG_STACK, "Get Stack\n");
meta_stack_tracker_dump (tracker);
if (windows)
*windows = (guint64 *)stack->data;
if (n_windows)
@ -1044,18 +1041,100 @@ meta_stack_tracker_raise_above (MetaStackTracker *tracker,
}
void
meta_stack_tracker_restack_windows (MetaStackTracker *tracker,
const guint64 *windows,
int n_windows)
meta_stack_tracker_restack_managed (MetaStackTracker *tracker,
const guint64 *managed,
int n_managed)
{
int i;
guint64 *windows;
int n_windows;
int old_pos, new_pos;
/* XRestackWindows() isn't actually a X requests - it's broken down
* by XLib into a series of XConfigureWindow(StackMode=below); we
* just do the same here directly. The main disadvantage of is that
* we allocate individual ops for each lower, and also that we are
* grabbing the libX11 lock separately for individual component.
if (n_managed == 0)
return;
meta_stack_tracker_get_stack (tracker, &windows, &n_windows);
/* If the top window has to be restacked, we don't want to move it to the very
* top of the stack, since apps expect override-redirect windows to stay near
* the top of the X stack; we instead move it above all managed windows (or
* above the guard window if there are no non-hidden managed windows.)
*/
for (i = 0; i < n_windows - 1; i++)
meta_stack_tracker_lower_below (tracker, windows[i + 1], windows[i]);
old_pos = n_windows - 1;
for (old_pos = n_windows - 1; old_pos >= 0; old_pos--)
{
MetaWindow *old_window = meta_display_lookup_stack_id (tracker->screen->display, windows[old_pos]);
if ((old_window && !old_window->override_redirect) || windows[old_pos] == tracker->screen->guard_window)
break;
}
g_assert (old_pos >= 0);
new_pos = n_managed - 1;
if (managed[new_pos] != windows[old_pos])
{
/* Move the first managed window in the new stack above all managed windows */
meta_stack_tracker_raise_above (tracker, managed[new_pos], windows[old_pos]);
meta_stack_tracker_get_stack (tracker, &windows, &n_windows);
/* Moving managed[new_pos] above windows[old_pos], moves the window at old_pos down by one */
}
old_pos--;
new_pos--;
while (old_pos >= 0 && new_pos >= 0)
{
if (windows[old_pos] == tracker->screen->guard_window)
break;
if (windows[old_pos] == managed[new_pos])
{
old_pos--;
new_pos--;
continue;
}
MetaWindow *old_window = meta_display_lookup_stack_id (tracker->screen->display, windows[old_pos]);
if (!old_window || old_window->override_redirect)
{
old_pos--;
continue;
}
meta_stack_tracker_lower_below (tracker, managed[new_pos], managed[new_pos + 1]);
meta_stack_tracker_get_stack (tracker, &windows, &n_windows);
/* Moving managed[new_pos] above windows[old_pos] moves the window at old_pos down by one,
* we'll examine it again to see if it matches the next new window */
old_pos--;
new_pos--;
}
while (new_pos >= 0)
{
meta_stack_tracker_lower_below (tracker, managed[new_pos], managed[new_pos - 1]);
new_pos--;
}
}
void
meta_stack_tracker_restack_at_bottom (MetaStackTracker *tracker,
const guint64 *new_order,
int n_new_order)
{
guint64 *windows;
int n_windows;
int pos;
meta_stack_tracker_get_stack (tracker, &windows, &n_windows);
for (pos = 0; pos < n_new_order; pos++)
{
if (pos >= n_windows || windows[pos] != new_order[pos])
{
if (pos == 0)
meta_stack_tracker_lower (tracker, new_order[pos]);
else
meta_stack_tracker_raise_above (tracker, new_order[pos], new_order[pos - 1]);
meta_stack_tracker_get_stack (tracker, &windows, &n_windows);
}
}
}

6
src/core/stack-tracker.h
View File

@ -73,9 +73,13 @@ void meta_stack_tracker_lower_below (MetaStackTracker *tracker,
guint64 sibling);
void meta_stack_tracker_lower (MetaStackTracker *tracker,
guint64 window);
void meta_stack_tracker_restack_windows (MetaStackTracker *tracker,
void meta_stack_tracker_restack_managed (MetaStackTracker *tracker,
const guint64 *windows,
int n_windows);
void meta_stack_tracker_restack_at_bottom (MetaStackTracker *tracker,
const guint64 *new_order,
int n_new_order);
/* These functions are used to update the stack when we get events
* reflecting changes to the stacking order */

260
src/core/stack.c
View File

@ -101,7 +101,7 @@ void
meta_stack_add (MetaStack *stack,
MetaWindow *window)
{
g_return_if_fail (window->override_redirect);
g_return_if_fail (!window->override_redirect);
meta_topic (META_DEBUG_STACK, "Adding window %s to the stack\n", window->desc);
@ -1020,109 +1020,6 @@ stack_ensure_sorted (MetaStack *stack)
stack_do_resort (stack);
}
static guint64
find_top_most_managed_window (MetaScreen *screen,
guint64 ignore)
{
MetaStackTracker *stack_tracker = screen->stack_tracker;
guint64 *windows;
int n_windows;
int i;
meta_stack_tracker_get_stack (stack_tracker,
&windows, &n_windows);
/* Children are in order from bottom to top. We want to
* find the topmost managed child, then configure
* our window to be above it.
*/
for (i = n_windows -1; i >= 0; i--)
{
guint64 other_window = windows[i];
if (other_window == ignore)
{
/* Do nothing. This means we're already the topmost managed
* window, but it DOES NOT mean we are already just above
* the topmost managed window. This is important because if
* an override redirect window is up, and we map a new
* managed window, the new window is probably above the old
* popup by default, and we want to push it below that
* popup. So keep looking for a sibling managed window
* to be moved below.
*/
}
else
{
if (META_STACK_ID_IS_X11 (other_window))
{
MetaWindow *other = meta_display_lookup_x_window (screen->display,
other_window);
if (other != NULL && !other->override_redirect)
return other_window;
}
else
{
/* All wayland windows are currently considered "managed"
* TODO: consider wayland pop-up windows like override
* redirect windows here. */
return other_window;
}
}
}
return 0;
}
/**
* raise_window_relative_to_managed_windows:
*
* This function is used to avoid raising a window above popup
* menus and other such things.
*
* The key to the operation of this function is that we are expecting
* at most one window to be added at a time. If xwindow is newly added,
* then its own stack position will be too high (the frame window
* is created at the top of the stack), but if we ignore xwindow,
* then the *next* managed window in the stack will be a window that
* we've already stacked.
*
* We could generalize this and remove the assumption that windows
* are added one at a time by keeping an explicit ->stacked flag in
* MetaWindow.
*
* An alternate approach would be to reverse the stacking algorithm to
* work by placing each window above the others, and start by lowering
* a window to the bottom (instead of the current way, which works by
* placing each window below another and starting with a raise)
*/
static void
raise_window_relative_to_managed_windows (MetaScreen *screen,
guint64 stack_id)
{
guint64 sibling;
sibling = find_top_most_managed_window (screen, stack_id);
if (!sibling)
{
/* No sibling to use, just lower ourselves to the bottom
* to be sure we're below any override redirect windows.
*/
meta_stack_tracker_lower (screen->stack_tracker, stack_id);
return;
}
/* window is the topmost managed child */
meta_topic (META_DEBUG_STACK,
"Moving %s above topmost managed child window %s\n",
meta_display_describe_stack_id (screen->display, stack_id),
meta_display_describe_stack_id (screen->display, sibling));
meta_stack_tracker_raise_above (screen->stack_tracker,
stack_id, sibling);
}
/**
* stack_sync_to_server:
*
@ -1152,10 +1049,7 @@ stack_sync_to_xserver (MetaStack *stack)
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()
/* Create stacked xwindow arrays, in bottom-to-top order
*/
x11_stacked = g_array_new (FALSE, FALSE, sizeof (Window));
@ -1169,7 +1063,7 @@ stack_sync_to_xserver (MetaStack *stack)
meta_topic (META_DEBUG_STACK, "Top to bottom: ");
meta_push_no_msg_prefix ();
for (tmp = stack->sorted; tmp != NULL; tmp = tmp->next)
for (tmp = g_list_last(stack->sorted); tmp != NULL; tmp = tmp->prev)
{
MetaWindow *w = tmp->data;
Window top_level_window;
@ -1178,8 +1072,7 @@ stack_sync_to_xserver (MetaStack *stack)
meta_topic (META_DEBUG_STACK, "%u:%d - %s ",
w->layer, w->stack_position, w->desc);
/* remember, stacked is in reverse order (bottom to top) */
g_array_prepend_val (x11_stacked, w->xwindow);
g_array_append_val (x11_stacked, w->xwindow);
if (w->frame)
top_level_window = w->frame->xwindow;
@ -1216,143 +1109,12 @@ stack_sync_to_xserver (MetaStack *stack)
meta_topic (META_DEBUG_STACK, "Restacking %u windows\n",
all_root_children_stacked->len);
meta_error_trap_push (stack->screen->display);
if (all_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...
*/
guint64 *old_stack;
int old_len;
meta_stack_tracker_get_stack (stack->screen->stack_tracker,
&old_stack, &old_len);
const guint64 *new_stack = (guint64 *) all_root_children_stacked->data;
const int new_len = all_root_children_stacked->len;
const guint64 *oldp = old_stack;
const guint64 *newp = new_stack;
const guint64 *old_end = old_stack + old_len;
const guint64 *new_end = new_stack + new_len;
Window last_xwindow = None;
guint64 last_window = 0;
while (oldp != old_end &&
newp != new_end)
{
if (*oldp == *newp)
{
/* Stacks are the same here, move on */
++oldp;
if (META_STACK_ID_IS_X11 (*newp))
last_xwindow = (Window)*newp;
last_window = *newp;
++newp;
continue;
}
MetaWindow *old_window = meta_display_lookup_stack_id (stack->screen->display,
*oldp);
if (old_window == NULL || old_window->override_redirect)
{
/* *oldp is not known to us (probably unmanaged), or override_redirect, so
* we should skip it.
*/
++oldp;
}
else
{
/* Move *newp below the last_window */
if (!last_window)
{
meta_topic (META_DEBUG_STACK, "Using window %s as topmost (but leaving it in-place)\n",
meta_display_describe_stack_id (stack->screen->display, *newp));
raise_window_relative_to_managed_windows (stack->screen, *newp);
}
else if (META_STACK_ID_IS_X11 (*newp) &&
last_xwindow == None)
{
/* In this case we have an X window that we need to
* put below a wayland window and this is the
* topmost X window. */
/* In X terms (because this is the topmost X window)
* we want to
* raise_window_relative_to_managed_windows() to
* ensure the X window is below override-redirect
* pop-up windows.
*
* In Wayland terms we just want to ensure
* newp is lowered below last_window (which
* notably doesn't require an X request because we
* know last_window isn't an X window).
*/
raise_window_relative_to_managed_windows (stack->screen, *newp);
meta_stack_tracker_record_lower_below (stack->screen->stack_tracker,
*newp, last_window,
0); /* no x request serial */
}
else
{
/* This means that if last_xwindow is dead, but not
* *newp, then we fail to restack *newp; but on
* unmanaging last_xwindow, we'll fix it up.
*/
meta_topic (META_DEBUG_STACK, "Placing window %s below 0x%lx\n",
meta_display_describe_stack_id (stack->screen->display, *newp),
last_xwindow);
meta_stack_tracker_lower_below (stack->screen->stack_tracker,
*newp, last_window);
}
if (META_STACK_ID_IS_X11 (*newp))
last_xwindow = *newp;
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_restack_windows (stack->screen->stack_tracker,
newp, new_end - newp);
}
}
/* Push hidden X windows to the bottom of the stack under the guard window */
meta_stack_tracker_lower (stack->screen->stack_tracker,
stack->screen->guard_window);
meta_stack_tracker_restack_windows (stack->screen->stack_tracker,
(guint64 *)x11_hidden_stack_ids->data,
x11_hidden_stack_ids->len);
g_array_free (x11_hidden_stack_ids, 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.
*/
meta_stack_tracker_restack_managed (stack->screen->stack_tracker,
(guint64 *)all_root_children_stacked->data,
all_root_children_stacked->len);
meta_stack_tracker_restack_at_bottom (stack->screen->stack_tracker,
(guint64 *)x11_hidden_stack_ids->data,
x11_hidden_stack_ids->len);
/* Sync _NET_CLIENT_LIST and _NET_CLIENT_LIST_STACKING */
@ -1373,8 +1135,6 @@ stack_sync_to_xserver (MetaStack *stack)
g_array_free (x11_stacked, TRUE);
g_array_free (all_root_children_stacked, TRUE);
/* That was scary... */
}
MetaWindow*