ozone: Interpret absolute events for graphics tablets

ui/events/ozone/evdev/tablet_event_converter_evdev.h

 // 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_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_
-#define UI_EVENTS_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_
+#ifndef UI_EVENTS_OZONE_TABLET_EVENT_CONVERTER_EVDEV_H_
+#define UI_EVENTS_OZONE_TABLET_EVENT_CONVERTER_EVDEV_H_
 
 #include "base/files/file_path.h"
 #include "base/message_loop/message_pump_libevent.h"
 #include "ui/events/event.h"
 #include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
 #include "ui/events/ozone/evdev/event_converter_evdev.h"
+#include "ui/events/ozone/evdev/event_device_info.h"
 #include "ui/events/ozone/evdev/event_modifiers_evdev.h"
 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
-#include "ui/events/ozone/evdev/keyboard_evdev.h"
 
 struct input_event;
 
 namespace ui {
 
-class EVENTS_OZONE_EVDEV_EXPORT EventConverterEvdevImpl
+class EVENTS_OZONE_EVDEV_EXPORT TabletEventConverterEvdev
     : public EventConverterEvdev {
  public:
-  EventConverterEvdevImpl(int fd,
-                          base::FilePath path,
-                          int id,
-                          EventModifiersEvdev* modifiers,
-                          CursorDelegateEvdev* cursor,
-                          KeyboardEvdev* keyboard,
-                          const EventDispatchCallback& callback);
-  ~EventConverterEvdevImpl() override;
+  TabletEventConverterEvdev(int fd,
+                            base::FilePath path,
+                            int id,
+                            EventModifiersEvdev* modifiers,
+                            CursorDelegateEvdev* cursor,
+                            const EventDeviceInfo& info,
+                            const EventDispatchCallback& callback);
+  virtual ~TabletEventConverterEvdev();
 
   // EventConverterEvdev:
   void OnFileCanReadWithoutBlocking(int fd) override;
 
   void ProcessEvents(const struct input_event* inputs, int count);
 
  private:
+  friend class MockTabletEventConverterEvdev;
   void ConvertKeyEvent(const input_event& input);
-
-  void ConvertMouseMoveEvent(const input_event& input);
-
+  void ConvertAbsEvent(const input_event& input);
   void DispatchMouseButton(const input_event& input);
+  void UpdateCursor();
 
   // Flush events delimited by EV_SYN. This is useful for handling
   // non-axis-aligned movement properly.
   void FlushEvents();
 
-  // Save x-axis events of relative devices to be flushed at EV_SYN time.
-  int x_offset_;
-
-  // Save y-axis events of relative devices to be flushed at EV_SYN time.
-  int y_offset_;
-
   // Controller for watching the input fd.
   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 
   // Shared cursor state.
   CursorDelegateEvdev* cursor_;
 
-  // Shared keyboard state.
-  KeyboardEvdev* keyboard_;
-
   // Modifier key state (shift, ctrl, etc).
   EventModifiersEvdev* modifiers_;
 
   // Callback for dispatching events.
   EventDispatchCallback callback_;
 
-  DISALLOW_COPY_AND_ASSIGN(EventConverterEvdevImpl);
+  int y_abs_location_;
+  int x_abs_location_;
+  int x_abs_min_;
+  int y_abs_min_;
+  int x_abs_range_;
+  int y_abs_range_;
+
+  // BTN_TOOL_ code for the active device
+  int stylus_;
+
+  // Whether we need to move the cursor
+  bool abs_value_dirty_;
+
+  DISALLOW_COPY_AND_ASSIGN(TabletEventConverterEvdev);
 };
 
 }  // namespace ui
 
-#endif  // UI_EVENTS_OZONE_EVDEV_EVENT_CONVERTER_EVDEV_IMPL_H_
-
+#endif  // UI_EVENTS_OZONE_TABLET_EVENT_CONVERTER_EVDEV_H_