Implement the transition between zoom view.

shell/view/home/HomeWindow.py

@@ -19,20 +19,25 @@ import hippo
 import cairo
 
 from sugar.graphics.menushell import MenuShell
+from sugar.graphics import units
 import sugar
+
 from view.home.MeshBox import MeshBox
 from view.home.HomeBox import HomeBox
 from view.home.FriendsBox import FriendsBox
+from view.home.transitionbox import TransitionBox
 
 _HOME_PAGE       = 0
 _FRIENDS_PAGE    = 1
 _MESH_PAGE       = 2
+_TRANSITION_PAGE = 3
 
 class HomeWindow(gtk.Window):
     def __init__(self, shell):
         gtk.Window.__init__(self)
         self._shell = shell
         self._active = False
+        self._level = sugar.ZOOM_HOME
 
         self.set_default_size(gtk.gdk.screen_width(),
                               gtk.gdk.screen_height())
@@ -68,6 +73,15 @@ class HomeWindow(gtk.Window):
         self._nb.append_page(canvas)
         canvas.show()
 
+        canvas = hippo.Canvas()
+        self._transition_box = TransitionBox()
+        canvas.set_root(self._transition_box)
+        self._nb.append_page(canvas)
+        canvas.show()
+        
+        self._transition_box.connect('completed',
+                                     self._transition_completed_cb)
+
     def _key_release_cb(self, widget, event):
         keyname = gtk.gdk.keyval_name(event.keyval)
         if keyname == "Alt_L":
@@ -88,11 +102,25 @@ class HomeWindow(gtk.Window):
         self._update_mesh_state()
             
     def set_zoom_level(self, level):
+        self._level = level
+    
+        self._nb.set_current_page(_TRANSITION_PAGE)
+
         if level == sugar.ZOOM_HOME:
-            self._nb.set_current_page(_HOME_PAGE)
+            scale = units.XLARGE_ICON_SCALE
         elif level == sugar.ZOOM_FRIENDS:
-            self._nb.set_current_page(_FRIENDS_PAGE)
+            scale = units.LARGE_ICON_SCALE
         elif level == sugar.ZOOM_MESH:
+            scale = units.STANDARD_ICON_SCALE
+            
+        self._transition_box.set_scale(scale)
+    
+    def _transition_completed_cb(self, transition_box):
+        if self._level == sugar.ZOOM_HOME:
+            self._nb.set_current_page(_HOME_PAGE)
+        elif self._level == sugar.ZOOM_FRIENDS:
+            self._nb.set_current_page(_FRIENDS_PAGE)
+        elif self._level == sugar.ZOOM_MESH:
             self._nb.set_current_page(_MESH_PAGE)
 
         self._update_mesh_state()

shell/view/home/transitionbox.py

@@ -0,0 +1,66 @@
+# Copyright (C) 2007, Red Hat, Inc.
+#
+# 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import hippo
+import gobject
+
+from sugar.graphics import units
+from sugar.graphics import animator
+from sugar.graphics.spreadbox import SpreadBox
+
+from view.home.MyIcon import MyIcon
+
+class _Animation(animator.Animation):
+    def __init__(self, icon, start_scale, end_scale):
+        animator.Animation.__init__(self, 0.0, 1.0)
+
+        self._icon = icon
+        self.start_scale = start_scale
+        self.end_scale = end_scale
+
+    def next_frame(self, current):
+        d = (self.end_scale - self.start_scale) * current
+        self._icon.props.scale = self.start_scale + d
+
+class TransitionBox(SpreadBox):
+    __gtype_name__ = 'SugarTransitionBox'
+    
+    __gsignals__ = {
+        'completed': (gobject.SIGNAL_RUN_FIRST,
+                      gobject.TYPE_NONE, ([]))
+    }
+    
+    def __init__(self):
+        SpreadBox.__init__(self, background_color=0xe2e2e2ff)
+
+        self._scale = 0.0
+
+        self._my_icon = MyIcon(units.LARGE_ICON_SCALE)
+        self.set_center_item(self._my_icon)
+
+        self._animator = animator.Animator(0.5, 30)
+        self._animator.connect('completed', self._animation_completed_cb)
+
+    def _animation_completed_cb(self, anim):
+        self.emit('completed')
+
+    def set_scale(self, scale):
+        self._animator.remove_all()
+        self._animator.add(_Animation(self._my_icon, self._scale, scale))
+        self._animator.start()
+        
+        self._scale = scale
+

sugar/graphics/animator.py

@@ -39,6 +39,10 @@ class Animator(gobject.GObject):
     def add(self, animation):
         self._animations.append(animation)
 
+    def remove_all(self):
+        self.stop()
+        self._animations = []
+
     def start(self):
         if self._timeout_sid:
             self.stop()