问题
I need to implement certain functions only when the keyboard is attached to the surface. Is there a way I can detect when the surface keyboard is attached or removed ?
I tried this code on Surface:
function getKeyboardCapabilities()
{
var keyboardCapabilities = new Windows.Devices.Input.KeyboardCapabilities();
console.log(keyboardCapabilities.keyboardPresent);
}
The result was always '1' even when the keyboard was not connected.
回答1:
I used this code to identify when a keyboard is connected to a Surface:
var keyboardWatcher = (function () {
// private
var keyboardState = false;
var watcher = Windows.Devices.Enumeration.DeviceInformation.createWatcher();
watcher.addEventListener("added", function (devUpdate) {
// GUID_DEVINTERFACE_KEYBOARD
if ((devUpdate.id.indexOf('{884b96c3-56ef-11d1-bc8c-00a0c91405dd}') != -1) && (devUpdate.id.indexOf('MSHW0007') == -1) ) {
if (devUpdate.properties['System.Devices.InterfaceEnabled'] == true) {
// keyboard is connected
keyboardState = true;
}
}
});
watcher.addEventListener("updated", function (devUpdate) {
if (devUpdate.id.indexOf('{884b96c3-56ef-11d1-bc8c-00a0c91405dd}') != -1) {
if (devUpdate.properties['System.Devices.InterfaceEnabled']) {
// keyboard is connected
keyboardState = true;
}
else {
// keyboard disconnected
keyboardState = false;
}
}
});
watcher.start();
// public
return {
isAttached: function () {
return keyboardState;
}
}
})();
Then call KeyboardWatcher.isAttached()
whenever you need to check the status of the keyboard.
回答2:
I could not find a good way to detect if a keyboard is attached so instead I detect if I am in tablet mode or desktop mode.
bool bIsDesktop = false;
var uiMode = UIViewSettings.GetForCurrentView().UserInteractionMode;
if (uiMode == Windows.UI.ViewManagement.UserInteractionMode.Mouse) // Typical of Desktop
bIsDesktop = true;
Note the other possible value of uiMode is Windows.UI.ViewManagement.UserInteractionMode.Touch.
来源:https://stackoverflow.com/questions/20124702/how-to-detect-if-the-surface-keyboard-is-attached