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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 UI_BASE_POINTER_TOUCH_UI_CONTROLLER_H_
#define UI_BASE_POINTER_TOUCH_UI_CONTROLLER_H_
#include <memory>
#include "base/callback_list.h"
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "build/blink_buildflags.h"
#include "build/build_config.h"
#if BUILDFLAG(USE_BLINK)
#include "ui/base/pointer/pointer_device.h"
#endif // BUILDFLAG(USE_BLINK)
#if BUILDFLAG(IS_WIN)
namespace gfx {
class SingletonHwndObserver;
}
#endif
namespace ui {
// Central controller to handle touch UI modes.
class COMPONENT_EXPORT(UI_BASE) TouchUiController {
public:
using CallbackList = base::RepeatingClosureList;
enum class TouchUiState {
kDisabled,
kAuto,
kEnabled,
};
class COMPONENT_EXPORT(UI_BASE) TouchUiScoperForTesting {
public:
explicit TouchUiScoperForTesting(bool enabled,
TouchUiController* controller = Get());
TouchUiScoperForTesting(const TouchUiScoperForTesting&) = delete;
TouchUiScoperForTesting& operator=(const TouchUiScoperForTesting&) = delete;
~TouchUiScoperForTesting();
// Update the current touch mode state but still roll back to the
// original state at destruction. Allows a test to change the mode
// multiple times without creating multiple instances.
void UpdateState(bool enabled);
private:
const raw_ptr<TouchUiController> controller_;
const TouchUiState old_state_;
};
static TouchUiController* Get();
explicit TouchUiController(TouchUiState touch_ui_state = TouchUiState::kAuto);
TouchUiController(const TouchUiController&) = delete;
TouchUiController& operator=(const TouchUiController&) = delete;
virtual ~TouchUiController();
// The value is indeterminate at startup, ensure that all consumers of
// touch_ui state register a callback to get the correct initial value.
bool touch_ui() const {
return (touch_ui_state_ == TouchUiState::kEnabled) ||
((touch_ui_state_ == TouchUiState::kAuto) && tablet_mode_);
}
base::CallbackListSubscription RegisterCallback(
const base::RepeatingClosure& closure);
void OnTabletModeToggled(bool enabled);
#if BUILDFLAG(IS_WIN)
// Check whether a device is in tablet or desktop mode in a threadpool thread,
// and notify listeners.
void RefreshTabletMode();
#endif // BUILDFLAG(IS_WIN)
#if BUILDFLAG(USE_BLINK)
void OnPointerDeviceConnected(PointerDevice::Key key);
void OnPointerDeviceDisconnected(PointerDevice::Key key);
#endif // BUILDFLAG(USE_BLINK)
protected:
TouchUiState SetTouchUiState(TouchUiState touch_ui_state);
#if BUILDFLAG(USE_BLINK)
virtual int MaxTouchPoints() const;
virtual std::optional<PointerDevice> GetPointerDevice(
PointerDevice::Key key) const;
virtual std::vector<PointerDevice> GetPointerDevices() const;
const std::vector<PointerDevice>& GetLastKnownPointerDevicesForTesting()
const;
#endif // BUILDFLAG(USE_BLINK)
private:
void TouchUiChanged();
// Records whether the user has entered touch mode and runs callbacks
// if touch mode has initially been detected.
void SetInitialTabletMode(bool enabled);
bool tablet_mode_ = false;
TouchUiState touch_ui_state_;
#if BUILDFLAG(USE_BLINK)
void OnInitializePointerDevices();
std::vector<PointerDevice> last_known_pointer_devices_;
#endif // BUILDFLAG(USE_BLINK)
#if BUILDFLAG(IS_WIN)
std::unique_ptr<gfx::SingletonHwndObserver> singleton_hwnd_observer_;
#endif
CallbackList callback_list_;
base::WeakPtrFactory<TouchUiController> weak_factory_{this};
};
} // namespace ui
#endif // UI_BASE_POINTER_TOUCH_UI_CONTROLLER_H_
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