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// Copyright (c) 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 UI_AURA_WINDOW_TARGETER_H_
#define UI_AURA_WINDOW_TARGETER_H_
#include "base/macros.h"
#include "ui/aura/aura_export.h"
#include "ui/events/event_targeter.h"
namespace ui {
class KeyEvent;
class LocatedEvent;
} // namespace ui
namespace aura {
class Window;
class AURA_EXPORT WindowTargeter : public ui::EventTargeter {
public:
WindowTargeter();
~WindowTargeter() override;
// Returns true if |window| or one of its descendants can be a target of
// |event|. This requires that |window| and its descendants are not
// prohibited from accepting the event, and that the event is within an
// actionable region of the target's bounds. Note that the location etc. of
// |event| is in |window|'s parent's coordinate system.
virtual bool SubtreeShouldBeExploredForEvent(Window* window,
const ui::LocatedEvent& event);
protected:
// Same as FindTargetForEvent(), but used for positional events. The location
// etc. of |event| are in |root|'s coordinate system. When finding the target
// for the event, the targeter can mutate the |event| (e.g. change the
// coordinate to be in the returned target's coordinate system) so that it can
// be dispatched to the target without any further modification.
virtual Window* FindTargetForLocatedEvent(Window* window,
ui::LocatedEvent* event);
// Returns false if neither |window| nor any of its descendants are allowed
// to accept |event| for reasons unrelated to the event's location or the
// target's bounds. For example, overrides of this function may consider
// attributes such as the visibility or enabledness of |window|. Note that
// the location etc. of |event| is in |window|'s parent's coordinate system.
virtual bool SubtreeCanAcceptEvent(Window* window,
const ui::LocatedEvent& event) const;
// Returns whether the location of the event is in an actionable region of the
// target. Note that the location etc. of |event| is in the |window|'s
// parent's coordinate system.
virtual bool EventLocationInsideBounds(Window* target,
const ui::LocatedEvent& event) const;
// ui::EventTargeter:
ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
ui::Event* event) override;
ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
ui::Event* event) override;
private:
Window* FindTargetForKeyEvent(Window* root_window, const ui::KeyEvent& event);
Window* FindTargetForNonKeyEvent(Window* root_window, ui::Event* event);
Window* FindTargetInRootWindow(Window* root_window,
const ui::LocatedEvent& event);
Window* FindTargetForLocatedEventRecursively(Window* root_window,
ui::LocatedEvent* event);
DISALLOW_COPY_AND_ASSIGN(WindowTargeter);
};
} // namespace aura
#endif // UI_AURA_WINDOW_TARGETER_H_
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