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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_base_export.h" | 8 #include "ui/base/ui_base_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 | |
17 // Returns true if a touch device is available. | 12 // Returns true if a touch device is available. |
18 UI_BASE_EXPORT bool IsTouchDevicePresent(); | 13 UI_BASE_EXPORT bool IsTouchDevicePresent(); |
19 | 14 |
20 // Returns the maximum number of simultaneous touch contacts supported | 15 // Returns the maximum number of simultaneous touch contacts supported |
21 // by the device. In the case of devices with multiple digitizers (e.g. | 16 // 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 | 17 // multiple touchscreens), the value MUST be the maximum of the set of |
23 // maximum supported contacts by each individual digitizer. | 18 // maximum supported contacts by each individual digitizer. |
24 // For example, suppose a device has 3 touchscreens, which support 2, 5, | 19 // For example, suppose a device has 3 touchscreens, which support 2, 5, |
25 // and 10 simultaneous touch contacts, respectively. This returns 10. | 20 // and 10 simultaneous touch contacts, respectively. This returns 10. |
26 // http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints | 21 // http://www.w3.org/TR/pointerevents/#widl-Navigator-maxTouchPoints |
27 UI_BASE_EXPORT int MaxTouchPoints(); | 22 UI_BASE_EXPORT int MaxTouchPoints(); |
28 | 23 |
29 } // namespace ui | 24 } // namespace ui |
30 | 25 |
31 #endif // UI_BASE_TOUCH_TOUCH_DEVICE_H_ | 26 #endif // UI_BASE_TOUCH_TOUCH_DEVICE_H_ |
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