private async void SelectButton_Click(object sender, RoutedEventArgs e)
{
var item = (ListBoxItem)DisplaysListBox.SelectedValue;
if (item != null)
{
SelectButton.IsEnabled = false;
var name = (string)item.Content;
var deviceId = (string)item.Tag;
using (ClaimedLineDisplay lineDisplay = await ClaimedLineDisplay.FromIdAsync(deviceId))
{
if (lineDisplay != null)
{
await lineDisplay.DefaultWindow.TryClearTextAsync();
rootPage.NotifyUser($"Selected: {name}", NotifyType.StatusMessage);
// Save this device ID for other scenarios.
rootPage.LineDisplayId = deviceId;
}
else
{
rootPage.NotifyUser("Unable to claim the Line Display", NotifyType.ErrorMessage);
}
}
SelectButton.IsEnabled = true;
}
}
private async void DisplayTextButton_Click(object sender, RoutedEventArgs e)
{
string text = "Hello from UWP";
using (ClaimedLineDisplay lineDisplay = await ClaimedLineDisplay.FromIdAsync(rootPage.LineDisplayId))
{
if (lineDisplay != null)
{
var position = new Point(0, 0);
if (CenterCheckBox.IsChecked.Value)
{
var length = text.Length;
if (length < lineDisplay.DefaultWindow.SizeInCharacters.Width)
{
position.X = ((int)lineDisplay.DefaultWindow.SizeInCharacters.Width - length) / 2;
}
}
LineDisplayTextAttribute attribute = LineDisplayTextAttribute.Normal;
// If blinking is requested, verify that the device supports blinking.
if (BlinkCheckBox.IsChecked.Value)
{
if (lineDisplay.Capabilities.CanBlink == LineDisplayTextAttributeGranularity.NotSupported)
{
BlinkNotSupportedText.Visibility = Visibility.Visible;
}
else
{
// Device supports blinking.
attribute = LineDisplayTextAttribute.Blink;
}
}
if (await lineDisplay.DefaultWindow.TryClearTextAsync() &&
await lineDisplay.DefaultWindow.TryDisplayTextAsync(text, attribute, position))
{
rootPage.NotifyUser("Text displayed successfully", NotifyType.StatusMessage);
}
else
{
// We probably lost our claim.
rootPage.NotifyUser("Unable to display text", NotifyType.ErrorMessage);
}
}
else
{
rootPage.NotifyUser("Unable to claim the Line Display", NotifyType.ErrorMessage);
}
}
}
public async Task <ClaimedLineDisplay> ClaimScenarioLineDisplayAsync()
{
ClaimedLineDisplay lineDisplay = null;
if (String.IsNullOrEmpty(LineDisplayId))
{
NotifyUser("You must use scenario 1 to select a line display", NotifyType.ErrorMessage);
}
else
{
lineDisplay = await ClaimedLineDisplay.FromIdAsync(LineDisplayId);
if (lineDisplay == null)
{
NotifyUser("Unable to claim selected LineDisplay from id.", NotifyType.ErrorMessage);
}
}
return(lineDisplay);
}