ui/base/touch/touch_device.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef UI_BASE_TOUCH_TOUCH_DEVICE_H_
   6 #define UI_BASE_TOUCH_TOUCH_DEVICE_H_
   7
   8 #include "ui/base/ui_base_export.h"
   9
  10 #if defined(OS_ANDROID)
  11 #include <jni.h>
  12 #endif
  13
  14
  15 namespace ui {
  16
  17 // Returns true if a touch device is available.
  18 UI_BASE_EXPORT bool IsTouchDevicePresent();
  19
  20 // Returns the maximum number of simultaneous touch contacts supported
  21 // by the device. In the case of devices with multiple digitizers (e.g.
  22 // multiple touchscreens), the value MUST be the maximum of the set of
  23 // maximum supported contacts by each individual digitizer.
  24 // For example, suppose a device has 3 touchscreens, which support 2, 5,
  25 // and 10 simultaneous touch contacts, respectively. This returns 10.
  26 // http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints
  27 UI_BASE_EXPORT int MaxTouchPoints();
  28
  29 #if defined(OS_ANDROID)
  30 bool RegisterTouchDeviceAndroid(JNIEnv* env);
  31 #endif
  32
  33 }  // namespace ui
  34
  35 #endif  // UI_BASE_TOUCH_TOUCH_DEVICE_H_