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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 #include "ui/base/touch/touch_device.h" | 5 #include "ui/base/touch/touch_device.h" |
6 #include "base/win/windows_version.h" | 6 #include "base/win/windows_version.h" |
7 #include <windows.h> | 7 #include <windows.h> |
8 | 8 |
9 namespace ui { | 9 namespace ui { |
10 | 10 |
11 bool IsTouchDevicePresent() { | 11 bool IsTouchDevicePresent() { |
12 int value = GetSystemMetrics(SM_DIGITIZER); | 12 int value = GetSystemMetrics(SM_DIGITIZER); |
13 return (value & NID_READY) && | 13 return (value & NID_READY) && |
14 ((value & NID_INTEGRATED_TOUCH) || (value & NID_EXTERNAL_TOUCH)); | 14 ((value & NID_INTEGRATED_TOUCH) || (value & NID_EXTERNAL_TOUCH)); |
15 } | 15 } |
16 | 16 |
17 int MaxTouchPoints() { | 17 int MaxTouchPoints() { |
| 18 if (!IsTouchDevicePresent()) |
| 19 return 0; |
| 20 |
18 return GetSystemMetrics(SM_MAXIMUMTOUCHES); | 21 return GetSystemMetrics(SM_MAXIMUMTOUCHES); |
19 } | 22 } |
20 | 23 |
21 } // namespace ui | 24 } // namespace ui |
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