标识输入设备
标识连接到 Windows 应用设备的输入设备，并标识其功能和属性。
重要 API：Windows.Devices.Input、Windows.UI.Input、Windows.UI.Xaml.Input
检索鼠标属性
Windows.Devices.Input 命名空间包含 MouseCapabilities 类，用于检索由一个或多个连接的鼠标公开的属性。 只需创建新的 MouseCapabilities 对象并获取感兴趣的属性。
注意 此处讨论的属性返回的值基于所有检测到的鼠标：如果至少一个鼠标支持特定功能，则布尔属性返回非零值，数值属性返回任何一个鼠标公开的最大值。
以下代码使用一系列 TextBlock 元素来显示各个鼠标属性和值。
private void GetMouseProperties()
{
MouseCapabilities mouseCapabilities = new Windows.Devices.Input.MouseCapabilities();
MousePresent.Text = mouseCapabilities.MousePresent != 0 ? "Yes" : "No";
VertWheel.Text = mouseCapabilities.VerticalWheelPresent != 0 ? "Yes" : "No";
HorzWheel.Text = mouseCapabilities.HorizontalWheelPresent != 0 ? "Yes" : "No";
SwappedButtons.Text = mouseCapabilities.SwapButtons != 0 ? "Yes" : "No";
NumButtons.Text = mouseCapabilities.NumberOfButtons.ToString();
}
检索键盘属性
Windows.Devices.Input 命名空间包含 KeyboardCapabilities 类，用于检索是否已连接键盘。 只需创建新的 KeyboardCapabilities 对象并获取 KeyboardPresent 属性。
以下代码使用 TextBlock 元素来显示键盘属性和值。
private void GetKeyboardProperties()
{
KeyboardCapabilities keyboardCapabilities = new Windows.Devices.Input.KeyboardCapabilities();
KeyboardPresent.Text = keyboardCapabilities.KeyboardPresent != 0 ? "Yes" : "No";
}
检索触摸属性
Windows.Devices.Input 命名空间包含 TouchCapabilities 类，用于检索是否已连接任何触摸数字化器。 只需创建新的 TouchCapabilities 对象并获取感兴趣的属性。
注意 此处讨论的属性返回的值基于所有检测到的触摸数字化器：如果至少一个数字化器支持特定功能，则布尔属性返回非零值，数值属性返回任何一个数字化器公开的最大值。
以下代码使用一系列 TextBlock 元素来显示触摸属性和值。
private void GetTouchProperties()
{
TouchCapabilities touchCapabilities = new Windows.Devices.Input.TouchCapabilities();
TouchPresent.Text = touchCapabilities.TouchPresent != 0 ? "Yes" : "No";
Contacts.Text = touchCapabilities.Contacts.ToString();
}
检索指针属性
Windows.Devices.Input 命名空间包含 PointerDevice 类，用于检索是否所有检测到的设备都支持指针输入（触摸、触摸板、鼠标或笔）。 只需创建新的 PointerDevice 对象并获取感兴趣的属性。
注意 此处讨论的属性返回的值基于所有检测到的指针设备：如果至少一个设备支持特定功能，则布尔属性返回非零值，数值属性返回任何一个指针设备公开的最大值。
以下代码使用一个表格来显示每个指针设备的属性和值。
private void GetPointerDevices()
{
IReadOnlyList<PointerDevice> pointerDevices = Windows.Devices.Input.PointerDevice.GetPointerDevices();
int gridRow = 0;
int gridColumn = 0;
for (int i = 0; i < pointerDevices.Count; i++)
{
// Pointer device type.
TextBlock textBlock1 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock1);
textBlock1.Text = (i + 1).ToString() + " Pointer Device Type:";
Grid.SetRow(textBlock1, gridRow);
Grid.SetColumn(textBlock1, gridColumn);
TextBlock textBlock2 = new TextBlock();
textBlock2.Text = pointerDevices[i].PointerDeviceType.ToString();
Grid_PointerProps.Children.Add(textBlock2);
Grid.SetRow(textBlock2, gridRow++);
Grid.SetColumn(textBlock2, gridColumn + 1);
// Is external?
TextBlock textBlock3 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock3);
textBlock3.Text = (i + 1).ToString() + " Is External?";
Grid.SetRow(textBlock3, gridRow);
Grid.SetColumn(textBlock3, gridColumn);
TextBlock textBlock4 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock4);
textBlock4.Text = pointerDevices[i].IsIntegrated.ToString();
Grid.SetRow(textBlock4, gridRow++);
Grid.SetColumn(textBlock4, gridColumn + 1);
// Maximum contacts.
TextBlock textBlock5 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock5);
textBlock5.Text = (i + 1).ToString() + " Max Contacts:";
Grid.SetRow(textBlock5, gridRow);
Grid.SetColumn(textBlock5, gridColumn);
TextBlock textBlock6 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock6);
textBlock6.Text = pointerDevices[i].MaxContacts.ToString();
Grid.SetRow(textBlock6, gridRow++);
Grid.SetColumn(textBlock6, gridColumn + 1);
// Physical device rectangle.
TextBlock textBlock7 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock7);
textBlock7.Text = (i + 1).ToString() + " Physical Device Rect:";
Grid.SetRow(textBlock7, gridRow);
Grid.SetColumn(textBlock7, gridColumn);
TextBlock textBlock8 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock8);
textBlock8.Text = pointerDevices[i].PhysicalDeviceRect.X.ToString() + "," +
pointerDevices[i].PhysicalDeviceRect.Y.ToString() + "," +
pointerDevices[i].PhysicalDeviceRect.Width.ToString() + "," +
pointerDevices[i].PhysicalDeviceRect.Height.ToString();
Grid.SetRow(textBlock8, gridRow++);
Grid.SetColumn(textBlock8, gridColumn + 1);
// Screen rectangle.
TextBlock textBlock9 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock9);
textBlock9.Text = (i + 1).ToString() + " Screen Rect:";
Grid.SetRow(textBlock9, gridRow);
Grid.SetColumn(textBlock9, gridColumn);
TextBlock textBlock10 = new TextBlock();
Grid_PointerProps.Children.Add(textBlock10);
textBlock10.Text = pointerDevices[i].ScreenRect.X.ToString() + "," +
pointerDevices[i].ScreenRect.Y.ToString() + "," +
pointerDevices[i].ScreenRect.Width.ToString() + "," +
pointerDevices[i].ScreenRect.Height.ToString();
Grid.SetRow(textBlock10, gridRow++);
Grid.SetColumn(textBlock10, gridColumn + 1);
gridColumn += 2;
gridRow = 0;
}
