[gnome-getting-started-docs] player: Set the window to be on top

[Jasper St. Pierre <jstpierre src gnome org>]

commit 74ef6aa1eacf41bfb1ad8f5d319257ce2933003d
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sat Nov 3 03:11:52 2012 -0400

    player: Set the window to be on top
    
    Since we want to launch Yelp under this, we need to set the player
    to be on top of all other windows. Clutter doesn't have a native way
    to set an alternate _NET_WM_STATE value, so we have to use raw Xlib
    ourselves. Welp.

 player/player.c |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/player/player.c b/player/player.c
index fe1d761..06c2351 100644
--- a/player/player.c
+++ b/player/player.c
@@ -89,6 +89,26 @@ set_idle_material (ClutterGstVideoTexture *video_texture)
   cogl_handle_unref (material);
 }
 
+static void
+set_above_and_fullscreen (void)
+{
+  Display *dpy = clutter_x11_get_default_display ();
+  Window win = clutter_x11_get_stage_window (CLUTTER_STAGE (stage));
+  char *atom_names[2] = {
+    "_NET_WM_STATE_FULLSCREEN",
+    "_NET_WM_STATE_ABOVE",
+  };
+  Atom states[G_N_ELEMENTS (atom_names)];
+
+  XInternAtoms (dpy, atom_names, G_N_ELEMENTS (atom_names),
+                False, states);
+
+  XChangeProperty (dpy, win,
+                   XInternAtom (dpy, "_NET_WM_STATE", False),
+                   XA_ATOM, 32, PropModeReplace,
+                   (unsigned char *) states, G_N_ELEMENTS (atom_names));
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -113,13 +133,28 @@ main (int argc, char *argv[])
     }
 
   stage = clutter_stage_new ();
+
+  /* Clutter's full-screening code does not allow us to
+   * set both that and _NET_WM_STATE_ABOVE, so do the state
+   * management ourselves for now. */
+#if 0
   clutter_stage_set_fullscreen (CLUTTER_STAGE (stage), TRUE);
+#endif
+
+  /* Clutter will set maximum size restrictions (meaning not
+   * full screen) unless I set this. */
+  clutter_stage_set_user_resizable (CLUTTER_STAGE (stage), TRUE);
+
   clutter_stage_set_use_alpha (CLUTTER_STAGE (stage), TRUE);
+
   clutter_actor_set_background_color (stage, &bg_color);
   clutter_actor_set_layout_manager (stage,
                                     clutter_bin_layout_new (CLUTTER_BIN_ALIGNMENT_FIXED,
                                                             CLUTTER_BIN_ALIGNMENT_FIXED));
 
+  clutter_actor_realize (stage);
+  set_above_and_fullscreen ();
+
   video = clutter_gst_video_texture_new ();
   clutter_actor_set_x_expand (video, TRUE);
   clutter_actor_set_y_expand (video, TRUE);