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// Copyright 2014 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 UI_EVENTS_DEVICE_DATA_MANAGER_H_
#define UI_EVENTS_DEVICE_DATA_MANAGER_H_
#include <stdint.h>
#include <vector>
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "base/observer_list.h"
#include "ui/events/device_hotplug_event_observer.h"
#include "ui/events/events_base_export.h"
#include "ui/events/keyboard_device.h"
#include "ui/events/touchscreen_device.h"
#include "ui/gfx/transform.h"
namespace ui {
class InputDeviceEventObserver;
// Keeps track of device mappings and event transformations.
class EVENTS_BASE_EXPORT DeviceDataManager : public DeviceHotplugEventObserver {
public:
static const int kMaxDeviceNum = 128;
~DeviceDataManager() override;
static void CreateInstance();
static DeviceDataManager* GetInstance();
static bool HasInstance();
void ClearTouchTransformerRecord();
void UpdateTouchInfoForDisplay(int64_t display_id,
unsigned int touch_device_id,
const gfx::Transform& touch_transformer);
void ApplyTouchTransformer(unsigned int touch_device_id, float* x, float* y);
int64_t GetDisplayForTouchDevice(unsigned int touch_device_id) const;
void UpdateTouchRadiusScale(unsigned int touch_device_id, double scale);
void ApplyTouchRadiusScale(unsigned int touch_device_id, double* radius);
const std::vector<TouchscreenDevice>& touchscreen_devices() const {
return touchscreen_devices_;
}
const std::vector<KeyboardDevice>& keyboard_devices() const {
return keyboard_devices_;
}
void AddObserver(InputDeviceEventObserver* observer);
void RemoveObserver(InputDeviceEventObserver* observer);
protected:
DeviceDataManager();
static DeviceDataManager* instance();
// DeviceHotplugEventObserver:
void OnTouchscreenDevicesUpdated(
const std::vector<TouchscreenDevice>& devices) override;
void OnKeyboardDevicesUpdated(
const std::vector<KeyboardDevice>& devices) override;
private:
static DeviceDataManager* instance_;
bool IsTouchDeviceIdValid(unsigned int touch_device_id) const;
double touch_radius_scale_map_[kMaxDeviceNum];
// Table to keep track of which display id is mapped to which touch device.
int64_t touch_device_to_display_map_[kMaxDeviceNum];
// Index table to find the TouchTransformer for a touch device.
gfx::Transform touch_device_transformer_map_[kMaxDeviceNum];
std::vector<TouchscreenDevice> touchscreen_devices_;
std::vector<KeyboardDevice> keyboard_devices_;
ObserverList<InputDeviceEventObserver> observers_;
DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
};
} // namespace ui
#endif // UI_EVENTS_DEVICE_DATA_MANAGER_H_
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