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_ 36
