DatePickerTextBox GotFocus事件

Question

如何从DatePickerTextBox捕获GotFocus事件，因此不会触发DatePicker和DatePickerTextBox GotFocus和GotKeyboardFocus事件。

Answer 1

GotFocus event is internally handled by DatePicker . It by default changes e.Handled = true for all GotFocus RoutedEvents which are triggered by its textbox.

But DatePicker.GotKeyboardFocus event is not effected by this. You can still listen to that event.

In order to fire GotFocus event, you'll have to explicitly add an event handler to listen to this it and change e.Handled to false . ie:

DatePicker1.AddHandler(DatePicker.GotFocusEvent, new RoutedEventHandler(DatePicker1_GotFocus), true);
void DatePicker1_GotFocus(object sender, RoutedEventArgs e)
{
    e.Handled = false;
}

Update:

To open calendar upon focus use PreviewKeyDown event:

void DatePicker1_PreviewKeyDown(object sender, KeyEventArgs e)
{
    var dp = sender as DatePicker;
    if (e.Key == Key.Tab)
    {
        dp.IsDropDownOpen = true;
    }      
}