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// Copyright 2012 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_TOUCH_TOUCH_OBSERVER_HUD_H_
#define ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
#include <stdint.h>
#include <string>
#include "ash/ash_export.h"
#include "ash/display/window_tree_host_manager.h"
#include "base/memory/raw_ptr.h"
#include "ui/display/display_observer.h"
#include "ui/display/manager/display_configurator.h"
#include "ui/display/manager/display_manager_observer.h"
#include "ui/events/event_handler.h"
#include "ui/views/widget/widget_observer.h"
namespace views {
class Widget;
}
namespace ash {
// An event filter which handles system level gesture events. Objects of this
// class manage their own lifetime. TODO(estade): find a more descriptive name
// for this class that aligns with its subclasses (or consider using composition
// over inheritance).
class ASH_EXPORT TouchObserverHud
: public ui::EventHandler,
public views::WidgetObserver,
public display::DisplayObserver,
public display::DisplayConfigurator::Observer,
public display::DisplayManagerObserver {
public:
TouchObserverHud(const TouchObserverHud&) = delete;
TouchObserverHud& operator=(const TouchObserverHud&) = delete;
// Called to clear touch points and traces from the screen.
virtual void Clear() = 0;
// Removes the HUD from the screen.
void Remove();
int64_t display_id() const { return display_id_; }
protected:
// |widget_name| is set on Widget::InitParams::name, and is used purely for
// debugging.
TouchObserverHud(aura::Window* initial_root, const std::string& widget_name);
~TouchObserverHud() override;
virtual void SetHudForRootWindowController(
RootWindowController* controller) = 0;
virtual void UnsetHudForRootWindowController(
RootWindowController* controller) = 0;
views::Widget* widget() { return widget_; }
// ui::EventHandler:
void OnTouchEvent(ui::TouchEvent* event) override = 0;
// views::WidgetObserver:
void OnWidgetDestroying(views::Widget* widget) override;
// display::DisplayObserver:
void OnDisplaysRemoved(const display::Displays& removed_displays) override;
void OnDisplayMetricsChanged(const display::Display& display,
uint32_t metrics) override;
// display::DisplayConfigurator::Observer:
void OnDisplayConfigurationChanged(
const display::DisplayConfigurator::DisplayStateList& outputs) override;
// display::DisplayManagerObserver
void OnDisplaysInitialized() override;
void OnWillApplyDisplayChanges() override;
void OnDidApplyDisplayChanges() override;
private:
friend class TouchHudTestBase;
const int64_t display_id_;
raw_ptr<aura::Window> root_window_;
raw_ptr<views::Widget> widget_;
display::ScopedDisplayObserver display_observer_{this};
};
} // namespace ash
#endif // ASH_TOUCH_TOUCH_OBSERVER_HUD_H_
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