[gnome-clocks] Add a spotlight transition to/from the standalone clock

[Paolo Borelli <pborelli src gnome org>]

commit 781480f6de41f4308a27bebd7d033320b3b04d79
Author: Paolo Borelli <pborelli gnome org>
Date:   Mon Aug 27 13:36:01 2012 +0200

    Add a spotlight transition to/from the standalone clock

 gnomeclocks/app.py     |   35 ++++++++++++++++++++++-------------
 gnomeclocks/widgets.py |   29 +++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+), 13 deletions(-)
---
diff --git a/gnomeclocks/app.py b/gnomeclocks/app.py
index c4f1503..5b98740 100644
--- a/gnomeclocks/app.py
+++ b/gnomeclocks/app.py
@@ -51,8 +51,8 @@ class Window(Gtk.ApplicationWindow):
 
         self.set_size_request(640, 480)
         self.vbox = Gtk.VBox()
-        embed = Embed(self.vbox)
-        self.add(embed)
+        self.embed = Embed(self.vbox)
+        self.add(self.embed)
         self.notebook = Gtk.Notebook()
         self.notebook.set_show_tabs(False)
         self.notebook.set_show_border(False)
@@ -64,7 +64,7 @@ class Window(Gtk.ApplicationWindow):
 
         self.views = (self.world, self.alarm, self.stopwatch, self.timer)
 
-        self.toolbar = ClocksToolbar(self.views, embed)
+        self.toolbar = ClocksToolbar(self.views, self.embed)
 
         self.vbox.pack_start(self.toolbar, False, False, 0)
         self.vbox.pack_start(self.toolbar.selection_toolbar, False, False, 0)
@@ -86,18 +86,27 @@ class Window(Gtk.ApplicationWindow):
         self.toolbar.activate_view(view)
 
     def _on_show_clock(self, widget, d):
-        self.toolbar._set_single_toolbar()
-        self.notebook.set_current_page(-1)
-        for child in self.single_evbox.get_children():
-            self.single_evbox.remove(child)
-        self.single_evbox.add(d.get_standalone_widget())
-        self.single_evbox.show_all()
-        self.toolbar.city_label.set_markup("<b>" + d.id + "</b>")
+        def show_standalone_clock():
+            self.toolbar._set_single_toolbar()
+            self.toolbar.city_label.set_markup("<b>%s</b>" % (d.id))
+            self.single_evbox.add(d.get_standalone_widget())
+            self.single_evbox.show_all()
+            self.notebook.set_current_page(-1)
+
+        self.embed.spotlight(show_standalone_clock)
 
     def _on_view_clock(self, button, view):
-        view.unselect_all()
-        self.notebook.set_current_page(self.views.index(view))
-        self.toolbar._set_overview_toolbar()
+        def show_clock_view():
+            for child in self.single_evbox.get_children():
+                self.single_evbox.remove(child)
+            view.unselect_all()
+            self.notebook.set_current_page(self.views.index(view))
+            self.toolbar._set_overview_toolbar()
+
+        if self.single_evbox.get_children():
+            self.embed.spotlight(show_clock_view)
+        else:
+            show_clock_view()
 
     def _on_new_activated(self, action, param):
         self.toolbar.current_view.open_new_dialog()
diff --git a/gnomeclocks/widgets.py b/gnomeclocks/widgets.py
index c0ad680..75d509a 100644
--- a/gnomeclocks/widgets.py
+++ b/gnomeclocks/widgets.py
@@ -828,6 +828,35 @@ class Embed(GtkClutter.Embed):
                                 Clutter.BinAlignment.FIXED)
         self.show_all()
 
+        # also pack a white background to use for spotlights
+        # between window modes
+        white = Clutter.Color.get_static(Clutter.StaticColor.WHITE)
+        self._background = Clutter.Actor(background_color=white)
+        self._viewLayout.add(self._background,
+                             Clutter.BinAlignment.FILL,
+                             Clutter.BinAlignment.FILL)
+        self._background.lower_bottom()
+
+    def _spotlight_finished(self, actor, name, is_finished):
+        self._viewActor.set_child_below_sibling(self._background, None)
+        self._background.disconnect_by_func(self._spotlight_finished)
+
+    def spotlight(self, action):
+        self._background.save_easing_state()
+        self._background.set_easing_duration(0)
+        self._viewActor.set_child_above_sibling(self._background, None)
+        self._background.set_opacity(255)
+        self._background.restore_easing_state()
+
+        action()
+
+        self._background.save_easing_state()
+        self._background.set_easing_duration(200)
+        self._background.set_easing_mode(Clutter.AnimationMode.LINEAR)
+        self._background.set_opacity(0)
+        self._background.restore_easing_state()
+        self._background.connect('transition-stopped::opacity', self._spotlight_finished)
+
     def set_show_selectionbar(self, show):
         if show:
             self._selectionToolbar.fade_in()