Animated Rotation

views/paint_lock.h

Index: views/paint_lock.h
diff --git a/views/paint_lock.h b/views/paint_lock.h
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+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef VIEWS_PAINT_LOCK_H_
+#define VIEWS_PAINT_LOCK_H_
+#pragma once
+
+#include "base/basictypes.h"
+
+namespace views {
+
+class View;
+
+// Instances of PaintLock can be created to disable painting of the view
+// (compositing is not disabled). When the class is destroyed, painting is
+// re-enabled. This can be useful during operations like animations, that are
+// sensitive to costly paints, and during which only composting, not painting,
+// is required.
+class PaintLock {
+ public:
+  // The paint lock does not own the view. It is an error for the view to be
+  // destroyed before the lock.
+  PaintLock(View* view);
+  ~PaintLock();
+
+ private:
+  View* view_;
+
+  DISALLOW_COPY_AND_ASSIGN(PaintLock);
+};
+
+} // namespace views
+
+#endif // VIEWS_PAINT_LOCK_H_