// Keyboard Events
void OnPreviewKeyDown(object sender, KeyEventArgs e)
{
var popup = VisualHelpers.FindAncester <PopupPanel>((DependencyObject)sender);
var cmd = GetPopupEscapeKeyCommand(popup);
switch (e.Key)
{
case Key.Escape:
if (cmd != null && cmd.CanExecute(null))
{
cmd.Execute(null);
e.Handled = true;
}
else
{
// By default the Escape Key closes the popup when pressed
var expression = GetBindingExpression(IsPopupVisibleProperty);
if (expression != null)
{
var dataType = expression.DataItem.GetType();
dataType.GetProperties().Single(x => x.Name == expression.ParentBinding.Path.Path)
.SetValue(expression.DataItem, false, null);
}
}
break;
case Key.Enter:
// Don't want to run Enter command if focus is in a TextBox with AcceptsReturn = True
if (
!(e.KeyboardDevice.FocusedElement is TextBox && ((TextBox)e.KeyboardDevice.FocusedElement).AcceptsReturn) &&
cmd != null && cmd.CanExecute(null))
{
cmd.Execute(null);
e.Handled = true;
}
break;
}
}
static object CoercePopupParent(DependencyObject obj, object value)
{
// If PopupParent is null, return the Window object
return(value ?? VisualHelpers.FindAncester <Window>(obj));
}
