screen: store WnckHandle in struct

Before 5ab809143a7d commit event filter was added in wnck_screen_get
when constructing first screen. Store WnckHandle in WnckScreen struct
to ensure that event filter is always added otherwise we might end up
without event filter if on startup nothing calls _wnck_get_handle.

This change introduces new requirement - wnck_set_client_type must be
used before using WnckScreen APIs.

2 files changed, 14 insertions, 0 deletions

diff --git a/libwnck/private.h b/libwnck/private.h
index f1a4af2..d37c328 100644
--- a/libwnck/private.h
+++ b/libwnck/private.h
@@ -133,6 +133,8 @@ SnDisplay* _wnck_screen_get_sn_display (WnckScreen *screen);
 
 WnckScreen* _wnck_screen_get_existing (int number);
 
+WnckHandle    *_wnck_screen_get_handle          (WnckScreen    *screen);
+
 void           _wnck_pager_activate_workspace   (WnckWorkspace *wspace,
                                                  guint32        timestamp);
 int            _wnck_pager_get_n_workspaces     (WnckPager     *pager);
diff --git a/libwnck/screen.c b/libwnck/screen.c
index d6db387..473c3fc 100644
--- a/libwnck/screen.c
+++ b/libwnck/screen.c
@@ -69,6 +69,8 @@ static WnckScreen** screens = NULL;
 
 struct _WnckScreenPrivate
 {
+  WnckHandle *handle;
+
   int number;
   Window xroot;
   Screen *xscreen;
@@ -529,6 +531,8 @@ wnck_screen_construct (Display    *display,
                        WnckScreen *screen,
                        int         number)
 {
+  screen->priv->handle = _wnck_get_handle ();
+
   /* Create the initial state of the screen. */
   screen->priv->xroot = RootWindow (display, number);
   screen->priv->xscreen = ScreenOfDisplay (display, number);
@@ -674,6 +678,14 @@ wnck_screen_get_for_root (gulong root_window_id)
   return NULL;
 }
 
+WnckHandle *
+_wnck_screen_get_handle (WnckScreen *screen)
+{
+  g_return_val_if_fail (WNCK_IS_SCREEN (screen), NULL);
+
+  return screen->priv->handle;
+}
+
 /**
  * wnck_screen_get_number:
  * @screen: a #WnckScreen.