| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "ui/base/touch/touch_device.h" |
| #include "base/logging.h" |
| #include "base/win/windows_version.h" |
| #include <windows.h> |
| |
| namespace ui { |
| |
| namespace { |
| |
| bool IsTouchDevicePresent() { |
| int value = GetSystemMetrics(SM_DIGITIZER); |
| return (value & NID_READY) && |
| ((value & NID_INTEGRATED_TOUCH) || (value & NID_EXTERNAL_TOUCH)); |
| } |
| |
| int GetAvailablePointerTypes() { |
| int available_pointer_types = 0; |
| if (IsTouchDevicePresent()) |
| available_pointer_types |= POINTER_TYPE_COARSE; |
| if (GetSystemMetrics(SM_MOUSEPRESENT) != 0 && |
| GetSystemMetrics(SM_CMOUSEBUTTONS) > 0) |
| available_pointer_types |= POINTER_TYPE_FINE; |
| |
| if (available_pointer_types == 0) |
| available_pointer_types = POINTER_TYPE_NONE; |
| |
| return available_pointer_types; |
| } |
| |
| int GetAvailableHoverTypes() { |
| int available_hover_types = 0; |
| if (IsTouchDevicePresent()) |
| available_hover_types |= HOVER_TYPE_ON_DEMAND; |
| if (GetSystemMetrics(SM_MOUSEPRESENT) != 0) |
| available_hover_types |= HOVER_TYPE_HOVER; |
| |
| if (available_hover_types == 0) |
| available_hover_types = HOVER_TYPE_NONE; |
| |
| return available_hover_types; |
| } |
| |
| } // namespace |
| |
| TouchScreensAvailability GetTouchScreensAvailability() { |
| if (!IsTouchDevicePresent()) |
| return TouchScreensAvailability::NONE; |
| |
| return TouchScreensAvailability::ENABLED; |
| } |
| |
| int MaxTouchPoints() { |
| if (!IsTouchDevicePresent()) |
| return 0; |
| |
| return GetSystemMetrics(SM_MAXIMUMTOUCHES); |
| } |
| |
| PointerType GetPrimaryPointerType(int available_pointer_types) { |
| if (available_pointer_types & POINTER_TYPE_FINE) |
| return POINTER_TYPE_FINE; |
| if (available_pointer_types & POINTER_TYPE_COARSE) |
| return POINTER_TYPE_COARSE; |
| DCHECK_EQ(available_pointer_types, POINTER_TYPE_NONE); |
| return POINTER_TYPE_NONE; |
| } |
| |
| HoverType GetPrimaryHoverType(int available_hover_types) { |
| if (available_hover_types & HOVER_TYPE_HOVER) |
| return HOVER_TYPE_HOVER; |
| if (available_hover_types & HOVER_TYPE_ON_DEMAND) |
| return HOVER_TYPE_ON_DEMAND; |
| DCHECK_EQ(available_hover_types, HOVER_TYPE_NONE); |
| return HOVER_TYPE_NONE; |
| } |
| |
| std::pair<int, int> GetAvailablePointerAndHoverTypes() { |
| return std::make_pair(GetAvailablePointerTypes(), GetAvailableHoverTypes()); |
| } |
| |
| } // namespace ui |