From 488402df7d37cf68d421229968632696a2a97bd7 Mon Sep 17 00:00:00 2001
From: Marco Pesenti Gritti <marco@localhost.localdomain>
Date: Wed, 06 Feb 2008 09:20:33 +0000
Subject: Split sugar-toolkit out of sugar shell.

---
(limited to 'sugar/graphics/animator.py')

diff --git a/sugar/graphics/animator.py b/sugar/graphics/animator.py
new file mode 100644
index 0000000..459851b
--- /dev/null
+++ b/sugar/graphics/animator.py
@@ -0,0 +1,94 @@
+# Copyright (C) 2007, Red Hat, Inc.
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library 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
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+# Boston, MA 02111-1307, USA.
+
+import time
+
+import gobject
+
+EASE_OUT_EXPO = 0
+EASE_IN_EXPO  = 1
+
+class Animator(gobject.GObject):
+    __gsignals__ = {
+        'completed': (gobject.SIGNAL_RUN_FIRST,
+                      gobject.TYPE_NONE, ([])),
+    }
+    
+    def __init__(self, time, fps=20, easing=EASE_OUT_EXPO):
+        gobject.GObject.__init__(self)
+        self._animations = []
+        self._time = time
+        self._interval = 1.0 / fps
+        self._easing = easing
+        self._timeout_sid = 0
+
+    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()
+
+        self._start_time = time.time()
+        self._timeout_sid = gobject.timeout_add(
+                    int(self._interval * 1000), self._next_frame_cb)
+
+    def stop(self):
+        if self._timeout_sid:
+            gobject.source_remove(self._timeout_sid)
+            self._timeout_sid = 0
+            self.emit('completed')
+
+    def _next_frame_cb(self):
+        current_time = min(self._time, time.time() - self._start_time)
+        current_time = max(current_time, 0.0)
+
+        for animation in self._animations:
+            animation.do_frame(current_time, self._time, self._easing)
+
+        if current_time == self._time:
+            self.stop()
+            return False
+        else:
+            return True
+
+class Animation(object):
+    def __init__(self, start, end):
+        self.start = start
+        self.end = end
+
+    def do_frame(self, time, duration, easing):
+        start = self.start
+        change = self.end - self.start
+
+        if time == duration:
+            # last frame
+            frame = self.end
+        else:
+            if easing == EASE_OUT_EXPO:
+                frame = change * (-pow(2, -10 * time/duration) + 1) + start;
+            elif easing == EASE_IN_EXPO:
+                frame = change * pow(2, 10 * (time / duration - 1)) + start;
+
+        self.next_frame(frame)
+
+    def next_frame(self, frame):
+        pass
--
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