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Diffstat (limited to 'components/view_manager/server_view_drawn_tracker_observer.h')
-rw-r--r-- | components/view_manager/server_view_drawn_tracker_observer.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/components/view_manager/server_view_drawn_tracker_observer.h b/components/view_manager/server_view_drawn_tracker_observer.h new file mode 100644 index 0000000..3d0f2bf --- /dev/null +++ b/components/view_manager/server_view_drawn_tracker_observer.h @@ -0,0 +1,28 @@ +// Copyright 2015 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 COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_ +#define COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_ + +namespace view_manager { + +class ServerView; + +class ServerViewDrawnTrackerObserver { + public: + // Invoked when the drawn state changes. If |is_drawn| is false |ancestor| + // identifies where the change occurred. In the case of a remove |ancestor| is + // the parent of the view that was removed. In the case of a visibility change + // |ancestor| is the parent of the view whose visibility changed. + virtual void OnDrawnStateChanged(ServerView* ancestor, + ServerView* view, + bool is_drawn) {} + + protected: + virtual ~ServerViewDrawnTrackerObserver() {} +}; + +} // namespace view_manager + +#endif // COMPONENTS_VIEW_MANAGER_SERVER_VIEW_DRAWN_TRACKER_OBSERVER_H_ |