If the locale specifies that the numeric separator is something else then '.' (e.g. ',' in Belgium) then the numeric keypad decimal key can not be used to enter a numeric separator in a WPF input control. However in applications like Excel this works. How can we do this in a WPF input control ? Very simple: we handle the PreviewKeyDown event and emulate the input of a numeric separator for that locale.
private static void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
if(e.Key == Key.Decimal &&
NumberFormatInfo.CurrentInfo.NumberDecimalSeparator != ".")
{
var _this = (sender as TextBox);
if(_this != null)
{
e.Handled = true;
var eventArgs = new TextCompositionEventArgs(
Keyboard.PrimaryDevice,
new TextComposition(
InputManager.Current,
Keyboard.FocusedElement,
NumberFormatInfo.CurrentInfo.NumberDecimalSeparator))
{
RoutedEvent = ContentElement.TextInputEvent
};
InputManager.Current.ProcessInput(eventArgs);
}
}
}
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