...

src/Makefile.am

@@ -57,6 +57,8 @@ metacity_SOURCES= 				\
 	screen.h				\
 	session.c				\
 	session.h				\
+	stack.c					\
+	stack.h					\
 	theme.c					\
 	theme.h					\
 	uislave.c				\

src/display.c

@@ -116,7 +116,9 @@ meta_display_open (const char *name)
     "_NET_WM_WINDOW_TYPE_MENU",
     "_NET_WM_WINDOW_TYPE_DIALOG",
     "_NET_WM_WINDOW_TYPE_NORMAL",
-    "_NET_WM_STATE_MODAL"
+    "_NET_WM_STATE_MODAL",
+    "_NET_CLIENT_LIST",
+    "_NET_CLIENT_LIST_STACKING"
   };
   Atom atoms[G_N_ELEMENTS(atom_names)];
   
@@ -181,6 +183,8 @@ meta_display_open (const char *name)
   display->atom_net_wm_window_type_dialog = atoms[25];
   display->atom_net_wm_window_type_normal = atoms[26];
   display->atom_net_wm_state_modal = atoms[27];
+  display->atom_net_client_list = atoms[28];
+  display->atom_net_client_list_stacking = atoms[29];
   
   screens = NULL;
   i = 0;

src/display.h

@@ -74,6 +74,8 @@ struct _MetaDisplay
   Atom atom_net_wm_window_type_dialog;
   Atom atom_net_wm_window_type_normal;
   Atom atom_net_wm_state_modal;
+  Atom atom_net_client_list;
+  Atom atom_net_client_list_stacking;
   
   /* This is the actual window from focus events,
    * not the one we last set

src/run-metacity.sh

@@ -9,7 +9,7 @@ elif test -z "$DEBUG"; then
   DEBUG=gdb
 fi
 
-Xnest :1 -scrns $SCREENS -geometry 640x480 &
-DISPLAY=:1 xsetroot -solid royalblue3
+Xnest :1 -scrns $SCREENS -geometry 640x480 -bw 15 &
+usleep 50000
 METACITY_UISLAVE_DIR=./uislave DISPLAY=:1 unst libtool --mode=execute $DEBUG ./metacity
 killall Xnest

src/stack.c

@@ -20,6 +20,10 @@
  */
 
 #include "stack.h"
+#include "window.h"
+#include "errors.h"
+
+#include <X11/Xatom.h>
 
 struct _MetaStackOp
 {
@@ -63,6 +67,7 @@ void
 meta_stack_free (MetaStack *stack)
 {
   GList *tmp;
+  int i;
   
   g_array_free (stack->windows, TRUE);
 
@@ -251,6 +256,56 @@ compute_layer (MetaWindow *window)
       window->layer = META_LAYER_NORMAL;
       break;
     }
+
+  meta_verbose ("Window %s on layer %d\n",
+                window->desc, window->layer);
+}
+
+static gboolean
+is_transient_for (MetaWindow *transient,
+                  MetaWindow *parent)
+{
+  MetaWindow *w;
+
+  w = transient;
+  while (w != NULL)
+    {
+      if (w->xtransient_for == None)
+        return FALSE;
+      
+      w = meta_display_lookup_x_window (w->display, w->xtransient_for);
+
+      if (w == transient)
+        return FALSE; /* Cycle detected */
+      else if (w == parent)
+        return TRUE;
+    }
+
+  return FALSE;
+}
+
+static int
+window_stack_cmp (MetaWindow *a,
+                  MetaWindow *b)
+{
+  /* Less than means higher in stacking, i.e. at the
+   * front of the list.
+   */
+
+  if (a->xtransient_for != None &&
+      is_transient_for (a, b))
+    {
+      /* a is higher than b due to transient_for */
+      return -1;
+    }
+  else if (b->xtransient_for != None &&
+           is_transient_for (b, a))
+    {
+      /* b is higher than a due to transient_for */
+      return 1;
+    }
+  else
+    return 0;  /* leave things as-is */
 }
 
 static void
@@ -265,11 +320,17 @@ meta_stack_sync_to_server (MetaStack *stack)
   int n_actually_added;
   int i, j;
   int old_size;
+  GArray *stacked;
   
   /* Bail out if frozen */
   if (stack->freeze_count > 0)
     return;
 
+  if (stack->pending == NULL)
+    return;
+  
+  meta_verbose ("Syncing window stack to server\n");
+  
   /* Here comes the fun - figure out all the stacking.
    * We make no pretense of efficiency.
    *   a) replay all the pending operations
@@ -304,7 +365,7 @@ meta_stack_sync_to_server (MetaStack *stack)
       tmp = tmp->next;
     }
 
-  old_size = stack->window->len;
+  old_size = stack->windows->len;
   g_array_set_size (stack->windows,
                     old_size + n_actually_added);
   
@@ -447,25 +508,81 @@ meta_stack_sync_to_server (MetaStack *stack)
   stack->pending = NULL;
   stack->n_added = 0;
 
-
   /* Sort the layer lists */
   i = 0;  
   while (i < META_LAYER_LAST)
     {
       if (needs_sort[i])
         {
-          
-
+          stack->layers[i] =
+            g_list_sort (stack->layers[i],
+                         (GCompareFunc) window_stack_cmp);
         }
 
       ++i;
     }
 
   /* Create stacked xwindow array */
+  stacked = g_array_new (FALSE, FALSE, sizeof (Window));
+  i = 0;  
+  while (i < META_LAYER_LAST)
+    {      
+      if (needs_sort[i])
+        {
+          stack->layers[i] =
+            g_list_sort (stack->layers[i],
+                         (GCompareFunc) window_stack_cmp);
+        }
+
+      tmp = stack->layers[i];
+      while (tmp != NULL)
+        {
+          MetaWindow *w = tmp->data;
+
+          g_array_append_val (stacked, w->xwindow);
+
+          tmp = tmp->next;
+        }
+      
+      ++i;
+    }
+
+  /* All windows should be in some stacking order */
+  if (stacked->len != stack->windows->len)
+    meta_bug ("%d windows stacked, %d windows exist in stack\n",
+              stacked->len, stack->windows->len);
   
   /* Sync to server */
+
+  meta_error_trap_push (stack->screen->display);
+  XRestackWindows (stack->screen->display->xdisplay,
+                   (Window *) stacked->data,
+                   stacked->len);
+  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_ATOM,
+                   32, PropModeReplace,
+                   stack->windows->data,
+                   stack->windows->len);
+  XChangeProperty (stack->screen->display->xdisplay,
+                   stack->screen->xroot,
+                   stack->screen->display->atom_net_client_list_stacking,
+                   XA_ATOM,
+                   32, PropModeReplace,
+                   stacked->data,
+                   stacked->len);
+
+  g_array_free (stacked, TRUE);
+
+  /* That was scary... */
 }
 

src/stack.h

@@ -0,0 +1,92 @@
+/* Metacity Window Stack */
+
+/* 
+ * Copyright (C) 2001 Havoc Pennington
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#ifndef META_STACK_H
+#define META_STACK_H
+
+#include "screen.h"
+
+/* Type of last-queued stacking operation, hung off of MetaWindow
+ * but an opaque type used only in stack.c
+ */
+typedef struct _MetaStackOp MetaStackOp;
+
+/* These MUST be in the order of stacking */
+typedef enum
+{
+  META_LAYER_DESKTOP   = 0,
+  META_LAYER_BOTTOM    = 1,
+  META_LAYER_NORMAL    = 2,
+  META_LAYER_TOP       = 3,
+  META_LAYER_DOCK      = 4,
+  META_LAYER_LAST      = 5
+} MetaStackLayer;
+
+struct _MetaStack
+{
+  MetaScreen *screen;
+
+  /* All windows that we manage, in mapping order,
+   * for _NET_CLIENT_LIST
+   */
+  GArray *windows;
+
+  /* List of MetaWindow* in each layer */
+  GList *layers[META_LAYER_LAST];
+
+  /* List of MetaStackOp, most recent op
+   * first in list.
+   */
+  GList *pending;
+  
+  int freeze_count;
+
+  int n_added;
+};
+
+MetaStack *meta_stack_new       (MetaScreen     *screen);
+void       meta_stack_free      (MetaStack      *stack);
+void       meta_stack_add       (MetaStack      *stack,
+                                 MetaWindow     *window);
+void       meta_stack_remove    (MetaStack      *stack,
+                                 MetaWindow     *window);
+/* re-read layer-related hints */
+void       meta_stack_update_layer    (MetaStack      *stack,
+                                       MetaWindow     *window);
+/* reconsider transient_for */
+void       meta_stack_update_transient (MetaStack     *stack,
+                                        MetaWindow    *window);
+
+/* raise/lower within a layer */
+void       meta_stack_raise     (MetaStack      *stack,
+                                 MetaWindow     *window);
+void       meta_stack_lower     (MetaStack      *stack,
+                                 MetaWindow     *window);
+
+/* On thaw, process pending and sync to server */
+void       meta_stack_freeze    (MetaStack      *stack);
+void       meta_stack_thaw      (MetaStack      *stack);
+
+#endif
+
+
+
+

src/window.c

@@ -53,6 +53,7 @@ static int      update_net_wm_type        (MetaWindow     *window);
 static void     recalc_window_type        (MetaWindow     *window);
 static int      set_wm_state              (MetaWindow     *window,
                                            int             state);
+static int      set_net_wm_state          (MetaWindow     *window);
 static void     send_configure_notify     (MetaWindow     *window);
 static gboolean process_configure_request (MetaWindow     *window,
                                            int             x,

src/window.h

@@ -24,6 +24,7 @@
 
 #include "screen.h"
 #include "util.h"
+#include "stack.h"
 #include <X11/Xutil.h>
 
 typedef enum

src/workspace.c

@@ -226,3 +226,6 @@ set_active_space_hint (MetaScreen *screen)
                    32, PropModeReplace, (guchar*) data, 1);
   return meta_error_trap_pop (screen->display);
 }
+
+
+