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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_EXO_TOUCH_H_
#define COMPONENTS_EXO_TOUCH_H_
#include "ash/shell_observer.h"
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "components/exo/surface_observer.h"
#include "ui/events/event_handler.h"
namespace ui {
class LocatedEvent;
class TouchEvent;
}
namespace exo {
class Seat;
class TouchDelegate;
class TouchStylusDelegate;
// This class implements a client touch device that represents one or more
// touch devices.
class Touch : public ui::EventHandler,
public SurfaceObserver,
public ash::ShellObserver {
public:
Touch(TouchDelegate* delegate, Seat* seat);
Touch(const Touch&) = delete;
Touch& operator=(const Touch&) = delete;
~Touch() override;
TouchDelegate* delegate() const { return delegate_; }
// Set delegate for stylus events.
void SetStylusDelegate(TouchStylusDelegate* delegate);
bool HasStylusDelegate() const;
// Overridden from ui::EventHandler:
void OnTouchEvent(ui::TouchEvent* event) override;
// Overridden from SurfaceObserver:
void OnSurfaceDestroying(Surface* surface) override;
// ash::ShellObserver:
void OnRootWindowAdded(aura::Window* root_window) override;
void OnRootWindowWillShutdown(aura::Window* root_window) override;
private:
// Returns the effective target for |event|.
Surface* GetEffectiveTargetForEvent(ui::LocatedEvent* event) const;
// Cancels touches on all the surfaces.
void CancelAllTouches();
// The delegate instance that all events are dispatched to.
const raw_ptr<TouchDelegate, DanglingUntriaged> delegate_;
const raw_ptr<Seat> seat_;
// The delegate instance that all stylus related events are dispatched to.
raw_ptr<TouchStylusDelegate> stylus_delegate_ = nullptr;
// Map of touch points to its focus surface.
base::flat_map<int, raw_ptr<Surface, CtnExperimental>>
touch_points_surface_map_;
// Map of a touched surface to the count of touch pointers on that surface.
base::flat_map<Surface*, int> surface_touch_count_map_;
};
} // namespace exo
#endif // COMPONENTS_EXO_TOUCH_H_
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