chromium/ui/wm/core/compound_event_filter.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_WM_CORE_COMPOUND_EVENT_FILTER_H_
#define UI_WM_CORE_COMPOUND_EVENT_FILTER_H_

#include <string_view>

#include "base/component_export.h"
#include "base/observer_list.h"
#include "ui/events/event.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/native_widget_types.h"

namespace ui {
class GestureEvent;
class KeyEvent;
class MouseEvent;
class TouchEvent;
}

namespace wm {

// TODO(beng): This class should die. AddEventHandler() on the root Window
//             should be used instead.
// CompoundEventFilter gets all events first and can provide actions to those
// events. It implements global features such as click to activate a window and
// cursor change when moving mouse.
// Additional event filters can be added to CompoundEventFilter. Events will
// pass through those additional filters in their addition order and could be
// consumed by any of those filters. If an event is consumed by a filter, the
// rest of the filter(s) and CompoundEventFilter will not see the consumed
// event.
class COMPONENT_EXPORT(UI_WM) CompoundEventFilter : public ui::EventHandler { … };

}  // namespace wm

#endif  // UI_WM_CORE_COMPOUND_EVENT_FILTER_H_