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// Copyright 2014 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_VIEWS_VIEW_TARGETER_H_
#define UI_VIEWS_VIEW_TARGETER_H_
#include <memory>
#include "base/memory/raw_ptr.h"
#include "ui/events/event_targeter.h"
#include "ui/views/views_export.h"
namespace gfx {
class Rect;
} // namespace gfx
namespace ui {
class GestureEvent;
class KeyEvent;
class ScrollEvent;
} // namespace ui
namespace views {
class View;
class ViewTargeterDelegate;
// A ViewTargeter is installed on a View that wishes to use the custom
// hit-testing or event-targeting behaviour defined by `delegate`.
class VIEWS_EXPORT ViewTargeter : public ui::EventTargeter {
public:
// The delegate may, but does not have to, be owned by `ViewTargeter`.
explicit ViewTargeter(ViewTargeterDelegate* delegate);
explicit ViewTargeter(std::unique_ptr<ViewTargeterDelegate> delegate);
ViewTargeter(const ViewTargeter&) = delete;
ViewTargeter& operator=(const ViewTargeter&) = delete;
~ViewTargeter() override;
// A call-through to DoesIntersectRect() on `delegate_`.
bool DoesIntersectRect(const View* target, const gfx::Rect& rect) const;
// A call-through to TargetForRect() on `delegate_`.
View* TargetForRect(View* root, const gfx::Rect& rect) const;
protected:
// ui::EventTargeter:
ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
ui::Event* event) override;
ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
ui::Event* event) override;
private:
View* FindTargetForKeyEvent(View* root, const ui::KeyEvent& key);
View* FindTargetForScrollEvent(View* root, const ui::ScrollEvent& scroll);
virtual View* FindTargetForGestureEvent(View* root,
const ui::GestureEvent& gesture);
virtual ui::EventTarget* FindNextBestTargetForGestureEvent(
ui::EventTarget* previous_target,
const ui::GestureEvent& gesture);
// ViewTargeter may or may not own `delegate_`; if it doesn't, `delegate_`
// must outlive it.
std::unique_ptr<ViewTargeterDelegate> owned_delegate_;
raw_ptr<ViewTargeterDelegate> delegate_;
};
} // namespace views
#endif // UI_VIEWS_VIEW_TARGETER_H_
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