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// Copyright 2014 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_VIEWS_VIEW_TARGETER_H_
#define UI_VIEWS_VIEW_TARGETER_H_
#include "ui/events/event_targeter.h"
#include "ui/views/views_export.h"
namespace views {
class View;
class ViewTargeterDelegate;
// Contains the logic used to determine the View to which an
// event should be dispatched. A ViewTargeter (or one of its
// derived classes) is installed on a View to specify the
// targeting behaviour to be used for the subtree rooted at
// that View.
// TODO(tdanderson): Remove overrides of all EventHandler methods except for
// FindTargetForEvent() and FindNextBestTarget().
class VIEWS_EXPORT ViewTargeter : public ui::EventTargeter {
public:
explicit ViewTargeter(ViewTargeterDelegate* delegate);
virtual ~ViewTargeter();
// 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:
// Returns the location of |event| represented as a rect. If |event| is
// a gesture event, its bounding box is returned. Otherwise, a 1x1 rect
// having its origin at the location of |event| is returned.
gfx::RectF BoundsForEvent(const ui::LocatedEvent& event) const;
// ui::EventTargeter:
virtual ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
ui::Event* event) OVERRIDE;
virtual ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
ui::Event* event) OVERRIDE;
virtual bool SubtreeCanAcceptEvent(
ui::EventTarget* target,
const ui::LocatedEvent& event) const OVERRIDE;
virtual bool EventLocationInsideBounds(
ui::EventTarget* target,
const ui::LocatedEvent& event) const OVERRIDE;
private:
View* FindTargetForKeyEvent(View* view, const ui::KeyEvent& key);
// ViewTargeter does not own the |delegate_|, but |delegate_| must
// outlive the targeter.
ViewTargeterDelegate* delegate_;
DISALLOW_COPY_AND_ASSIGN(ViewTargeter);
};
} // namespace views
#endif // UI_VIEWS_VIEW_TARGETER_H_
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