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- // Copyright 2018 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_AURA_WINDOW_EVENT_DISPATCHER_OBSERVER_H_
- #define UI_AURA_WINDOW_EVENT_DISPATCHER_OBSERVER_H_
- #include "ui/aura/aura_export.h"
- namespace ui {
- class Event;
- }
- namespace aura {
- class WindowEventDispatcher;
- // WindowEventDispatcherObservers are added to Env and observe *all*
- // WindowEventDispatchers.
- class AURA_EXPORT WindowEventDispatcherObserver {
- public:
- // Called when WindowEventDispatcher starts processing an event.
- //
- // NOTE: this function is called *after* the location has been transformed
- // (assuming the event is a located event). In other words, the coordinates
- // are DIPs when this is called.
- virtual void OnWindowEventDispatcherStartedProcessing(
- WindowEventDispatcher* dispatcher,
- const ui::Event& event) {}
- // Called when WindowEventDispatcher finishes processing an event.
- virtual void OnWindowEventDispatcherFinishedProcessingEvent(
- WindowEventDispatcher* dispatcher) {}
- // Called when the WindowEventDispatcher dispatches held events. See
- // WindowEventDispatcher::HoldMouseMoves() for more details.
- virtual void OnWindowEventDispatcherDispatchedHeldEvents(
- WindowEventDispatcher* dispatcher) {}
- // Called when the WindowEventDispatcher doesn't dispatch the event because
- // it's not appropriate at this time. For example a TouchEvent may be ignored
- // at certain points in a gesture.
- virtual void OnWindowEventDispatcherIgnoredEvent(
- WindowEventDispatcher* dispatcher) {}
- protected:
- virtual ~WindowEventDispatcherObserver() {}
- };
- } // namespace aura
- #endif // UI_AURA_WINDOW_EVENT_DISPATCHER_OBSERVER_H_
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