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// Copyright (c) 2013 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_BASE_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_OZONE_H_
#define UI_BASE_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_OZONE_H_
#include <bitset>
#include "base/compiler_specific.h"
#include "ui/base/ozone/event_converter_ozone.h"
#include "ui/base/ui_export.h"
#include "ui/events/event_constants.h"
namespace ui {
class TouchEvent;
class UI_EXPORT TouchEventConverterOzone : public EventConverterOzone {
public:
enum {
MAX_FINGERS = 11
};
TouchEventConverterOzone(int fd, int id);
virtual ~TouchEventConverterOzone();
private:
friend class MockTouchEventConverterOzone;
// Unsafe part of initialization.
void Init();
// Overidden from base::MessagePumpLibevent::Watcher.
virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
// Pressure values.
int pressure_min_;
int pressure_max_; // Used to normalize pressure values.
// Touch scaling.
float x_scale_;
float y_scale_;
// Maximum coordinate-values allowed for the events.
int x_max_;
int y_max_;
// Touch point currently being updated from the /dev/input/event* stream.
int current_slot_;
// File descriptor for the /dev/input/event* instance.
int fd_;
// Number corresponding to * in the source evdev device: /dev/input/event*
int id_;
// Bit field tracking which in-progress touch points have been modified
// without a syn event.
std::bitset<MAX_FINGERS> altered_slots_;
struct InProgressEvents {
int x_;
int y_;
int id_; // Device reported "unique" touch point id; -1 means not active
int finger_; // "Finger" id starting from 0; -1 means not active
EventType type_;
int major_;
float pressure_;
};
// In-progress touch points.
InProgressEvents events_[MAX_FINGERS];
DISALLOW_COPY_AND_ASSIGN(TouchEventConverterOzone);
};
} // namespace ui
#endif // UI_BASE_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_OZONE_H_
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