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// Copyright (c) 2012 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 ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
#define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
#include <stdint.h>
#include "ash/ash_export.h"
#include "ash/display/window_tree_host_manager.h"
#include "base/macros.h"
#include "ui/events/event_handler.h"
#include "ui/gfx/display_observer.h"
#include "ui/views/widget/widget_observer.h"
#if defined(OS_CHROMEOS)
#include "ui/display/chromeos/display_configurator.h"
#endif // defined(OS_CHROMEOS)
namespace views {
class Widget;
}
namespace ash {
// An event filter which handles system level gesture events. Objects of this
// class manage their own lifetime.
class ASH_EXPORT TouchObserverHUD : public ui::EventHandler,
public views::WidgetObserver,
public gfx::DisplayObserver,
#if defined(OS_CHROMEOS)
public ui::DisplayConfigurator::Observer,
#endif // defined(OS_CHROMEOS)
public WindowTreeHostManager::Observer {
public:
// Called to clear touch points and traces from the screen. Default
// implementation does nothing. Sub-classes should implement appropriately.
virtual void Clear();
// Removes the HUD from the screen.
void Remove();
int64_t display_id() const { return display_id_; }
protected:
explicit TouchObserverHUD(aura::Window* initial_root);
~TouchObserverHUD() override;
virtual void SetHudForRootWindowController(
RootWindowController* controller) = 0;
virtual void UnsetHudForRootWindowController(
RootWindowController* controller) = 0;
views::Widget* widget() { return widget_; }
// Overriden from ui::EventHandler.
void OnTouchEvent(ui::TouchEvent* event) override;
// Overridden from views::WidgetObserver.
void OnWidgetDestroying(views::Widget* widget) override;
// Overridden from gfx::DisplayObserver.
void OnDisplayAdded(const gfx::Display& new_display) override;
void OnDisplayRemoved(const gfx::Display& old_display) override;
void OnDisplayMetricsChanged(const gfx::Display& display,
uint32_t metrics) override;
#if defined(OS_CHROMEOS)
// Overriden from ui::DisplayConfigurator::Observer.
void OnDisplayModeChanged(
const ui::DisplayConfigurator::DisplayStateList& outputs) override;
#endif // defined(OS_CHROMEOS)
// Overriden form WindowTreeHostManager::Observer.
void OnDisplaysInitialized() override;
void OnDisplayConfigurationChanging() override;
void OnDisplayConfigurationChanged() override;
private:
friend class TouchHudTestBase;
const int64_t display_id_;
aura::Window* root_window_;
views::Widget* widget_;
DISALLOW_COPY_AND_ASSIGN(TouchObserverHUD);
};
} // namespace ash
#endif // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_