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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef ASH_FAST_INK_LASER_LASER_POINTER_CONTROLLER_H_
#define ASH_FAST_INK_LASER_LASER_POINTER_CONTROLLER_H_
#include <memory>
#include "ash/ash_export.h"
#include "ash/fast_ink/fast_ink_pointer_controller.h"
#include "base/observer_list.h"
#include "base/observer_list_types.h"
#include "base/scoped_observation.h"
#include "ui/aura/window_observer.h"
#include "ui/views/widget/unique_widget_ptr.h"
namespace ash {
class LaserPointerView;
// A checked observer which receives notification of changes to the Laser
// Pointer activation state.
class ASH_EXPORT LaserPointerObserver : public base::CheckedObserver {
public:
virtual void OnLaserPointerStateChanged(bool enabled) {}
};
// Controller for the laser pointer functionality. Enables/disables laser
// pointer as well as receives points and passes them off to be rendered.
class ASH_EXPORT LaserPointerController : public FastInkPointerController,
public aura::WindowObserver {
public:
LaserPointerController();
LaserPointerController(const LaserPointerController&) = delete;
LaserPointerController& operator=(const LaserPointerController&) = delete;
~LaserPointerController() override;
// Adds/removes the specified |observer|.
void AddObserver(LaserPointerObserver* observer);
void RemoveObserver(LaserPointerObserver* observer);
// aura::WindowObserver:
void OnWindowBoundsChanged(aura::Window* window,
const gfx::Rect& old_bounds,
const gfx::Rect& new_bounds,
ui::PropertyChangeReason reason) override;
void OnWindowDestroyed(aura::Window* window) override;
// fast_ink::FastInkPointerController:
void SetEnabled(bool enabled) override;
private:
friend class LaserPointerControllerTestApi;
class ScopedLockedHiddenCursor;
// fast_ink::FastInkPointerController:
views::View* GetPointerView() const override;
void CreatePointerView(base::TimeDelta presentation_delay,
aura::Window* root_window) override;
void UpdatePointerView(ui::TouchEvent* event) override;
void UpdatePointerView(ui::MouseEvent* event) override;
void DestroyPointerView() override;
bool CanStartNewGesture(ui::LocatedEvent* event) override;
bool ShouldProcessEvent(ui::LocatedEvent* event) override;
void NotifyStateChanged(bool enabled);
// Returns the content view of the |laser_pointer_view_widget_| as a
// LaserPointerView*.
LaserPointerView* GetLaserPointerView() const;
// |laser_pointer_view_widget_| will only hold an instance when the laser
// pointer is enabled and activated (pressed or dragged).
views::UniqueWidgetPtr laser_pointer_view_widget_;
base::ObserverList<LaserPointerObserver> observers_;
std::unique_ptr<ScopedLockedHiddenCursor> scoped_locked_hidden_cursor_;
base::ScopedObservation<aura::Window, aura::WindowObserver>
root_window_observation_{this};
};
} // namespace ash
#endif // ASH_FAST_INK_LASER_LASER_POINTER_CONTROLLER_H_
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