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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_BASE_TOUCH_TOUCH_DEVICE_H_ | 5 #ifndef UI_BASE_TOUCH_TOUCH_DEVICE_H_ |
6 #define UI_BASE_TOUCH_TOUCH_DEVICE_H_ | 6 #define UI_BASE_TOUCH_TOUCH_DEVICE_H_ |
7 | 7 |
8 #include "ui/base/ui_export.h" | 8 #include "ui/base/ui_export.h" |
9 | 9 |
10 namespace ui { | 10 namespace ui { |
11 | 11 |
| 12 // TODO(sblom): This is non-standard, and should be removed before |
| 13 // RuntimeEnabledFlags::PointerEventsMaxTouchPoints is marked stable. |
| 14 // Tracked by: http://crbug.com/308649 |
| 15 const int kMaxTouchPointsUnknown = -1; |
| 16 |
12 // Returns true if a touch device is available. | 17 // Returns true if a touch device is available. |
13 UI_EXPORT bool IsTouchDevicePresent(); | 18 UI_EXPORT bool IsTouchDevicePresent(); |
14 | 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_EXPORT int MaxTouchPoints(); |
| 28 |
15 } // namespace ui | 29 } // namespace ui |
16 | 30 |
17 #endif // UI_BASE_TOUCH_TOUCH_DEVICE_H_ | 31 #endif // UI_BASE_TOUCH_TOUCH_DEVICE_H_ |
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