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Unified Diff: ui/compositor/layer_observer.h

Issue 2254733003: Add ui::LayerObserver and use it to update Alt+Tab previews as needed. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: fix for other test Created 4 years, 4 months ago
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Index: ui/compositor/layer_observer.h
diff --git a/ui/compositor/layer_observer.h b/ui/compositor/layer_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..e1a7ee5f2fe3bb41e0aaf2af64db3d7e2caba714
--- /dev/null
+++ b/ui/compositor/layer_observer.h
@@ -0,0 +1,26 @@
+// Copyright 2016 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 UI_COMPOSITOR_LAYER_OBSERVER_H_
+#define UI_COMPOSITOR_LAYER_OBSERVER_H_
+
+#include "ui/compositor/compositor_export.h"
+
+namespace ui {
+
+class Layer;
+
+class COMPOSITOR_EXPORT LayerObserver {
+ public:
+ virtual void DidPaintLayer(Layer* layer, const gfx::Rect& region) {}
+ virtual void SurfaceChanged(Layer* layer) {}
+ virtual void LayerDestroyed(Layer* layer) {}
+
+ protected:
+ virtual ~LayerObserver() {}
+};
+
+} // namespace ui
+
+#endif // UI_COMPOSITOR_LAYER_OBSERVER_H_
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