Event handling support for ozone.

ui/base/ozone/touch_event_converter_ozone.h

+// 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_TOUCH_EVENT_CONVERTER_OZONE_H_
+#define UI_BASE_OZONE_TOUCH_EVENT_CONVERTER_OZONE_H_
+
+#include <bitset>
+
+#include "base/compiler_specific.h"
+#include "ui/base/events/event_constants.h"
+#include "ui/base/ozone/event_converter_ozone.h"
+#include "ui/base/ui_export.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_;
+
+  // 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_TOUCH_EVENT_CONVERTER_OZONE_H_