touch: Hide the X cursor when not in use.

views/touchui/touch_factory.h

 // Copyright (c) 2011 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 VIEWS_TOUCHUI_TOUCH_FACTORY_H_
 #define VIEWS_TOUCHUI_TOUCH_FACTORY_H_
 #pragma once
 
 #include <bitset>
 #include <vector>
 
 #include "base/singleton.h"
+#include "base/timer.h"
 
+typedef unsigned long Cursor;
 typedef unsigned long Window;
 typedef struct _XDisplay Display;
 
 namespace views {
 
 // Functions related to determining touch devices.
 class TouchFactory {
  public:
   // Returns the TouchFactory singleton.
   static TouchFactory* GetInstance();
 
   // Keep a list of touch devices so that it is possible to determine if a
   // pointer event is a touch-event or a mouse-event. The list is reset each
   // time this is called.
   void SetTouchDeviceList(const std::vector<unsigned int>& devices);
 
   // Is the device a touch-device?
   bool IsTouchDevice(unsigned int deviceid);
 
   // Grab the touch devices for the specified window on the specified display.
   // Returns if grab was successful for all touch devices.
   bool GrabTouchDevices(Display* display, ::Window window);
 
   // Ungrab the touch devices. Returns if ungrab was successful for all touch
   // devices.
   bool UngrabTouchDevices(Display* display);
 
+  // Update the root window to show (or hide) the cursor. Also indicate whether
+  // the timer should be started to automatically hide the cursor after a
+  // certain duration of inactivity (i.e. it is ignored if |show| is false).
+  void SetCursorVisible(bool show, bool start_timer);
+
+  // Whether the cursor is currently visible or not.
+  bool IsCursorVisible() {

[sky, 2011/01/26 21:08:19]

Name this is_cursor_visible() . Style guide says all cheap functions like this
are named unix_hacker_style.

+    return is_cursor_visible_;
+  }
+
  private:
   TouchFactory();
 
+  ~TouchFactory();
+
+  void HideCursorForInactivity() {
+    SetCursorVisible(false, false);
+  }
+
   // Requirement for Signleton
   friend struct DefaultSingletonTraits<TouchFactory>;
 
+  // The default cursor is hidden after startup, and when the mouse pointer is
+  // idle for a while. Once there is some event from a mouse device, the cursor
+  // is immediately displayed.
+  bool is_cursor_visible_;
+
+  // The cursor is hidden if it is idle for a certain amount time. This timer
+  // is used to keep track of the idleness.
+  base::OneShotTimer<TouchFactory> cursor_timer_;
+
+  // The invisible cursor.
+  Cursor invisible_cursor_;
+
   // NOTE: To keep track of touch devices, we currently maintain a lookup table
   // to quickly decide if a device is a touch device or not. We also maintain a
   // list of the touch devices. Ideally, there will be only one touch device,
   // and instead of having the lookup table and the list, there will be a single
   // identifier for the touch device. This can be completed after enough testing
   // on real touch devices.
 
   // A quick lookup table for determining if a device is a touch device.
   std::bitset<128> touch_device_lookup_;
 
   // The list of touch devices.
   std::vector<int> touch_device_list_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchFactory);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_TOUCHUI_TOUCH_FACTORY_H_