1 files changed, 41 insertions, 0 deletions
diff --git a/chromium/ash/shelf/shelf_model_observer.h b/chromium/ash/shelf/shelf_model_observer.h
new file mode 100644
index 00000000000..6d9f21fd2ff
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+++ b/chromium/ash/shelf/shelf_model_observer.h
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+// Copyright 2013 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 ASH_SHELF_SHELF_MODEL_OBSERVER_H_
+#define ASH_SHELF_SHELF_MODEL_OBSERVER_H_
+
+#include "ash/ash_export.h"
+#include "ash/launcher/launcher_types.h"
+
+namespace ash {
+
+struct LauncherItem;
+
+class ASH_EXPORT ShelfModelObserver {
+ public:
+  // Invoked after an item has been added to the model.
+  virtual void ShelfItemAdded(int index) = 0;
+
+  // Invoked after an item has been removed. |index| is the index the item was
+  // at.
+  virtual void ShelfItemRemoved(int index, LauncherID id) = 0;
+
+  // Invoked after an item has been moved. See ShelfModel::Move() for details
+  // of the arguments.
+  virtual void ShelfItemMoved(int start_index, int target_index) = 0;
+
+  // Invoked when the state of an item changes. |old_item| is the item
+  // before the change.
+  virtual void ShelfItemChanged(int index, const LauncherItem& old_item) = 0;
+
+  // Invoked when shelf status is changed.
+  virtual void ShelfStatusChanged() = 0;
+
+ protected:
+  virtual ~ShelfModelObserver() {}
+};
+
+}  // namespace ash
+
+#endif  // ASH_SHELF_SHELF_MODEL_OBSERVER_H_