/// <summary>
/// Occurs when the <see cref="RoutedCommand"/> is executed.
/// </summary>
/// <param name="sender">The sender of the event.</param>
/// <param name="e">An <see cref="ExecutedRoutedEventArgs"/> that contains the event data.</param>
private void OnFontSizeExecute(object sender, ExecutedRoutedEventArgs e)
{
DoubleValueCommandParameter parameter = e.Parameter as DoubleValueCommandParameter;
if (parameter != null)
{
if (parameter.ConversionException != null)
{
MessageBox.Show(parameter.ConversionException.Message, "Invalid Font Size", MessageBoxButton.OK, MessageBoxImage.Exclamation);
}
else
{
switch (parameter.Action)
{
case ValueCommandParameterAction.CancelPreview:
this.DeactivatePreviewMode(true);
break;
case ValueCommandParameterAction.Commit:
this.DeactivatePreviewMode(false);
this.SelectionFontSize = parameter.Value;
break;
case ValueCommandParameterAction.Preview:
this.ActivatePreviewMode();
this.SelectionFontSize = parameter.PreviewValue;
break;
}
}
e.Handled = true;
}
}
/// <summary>
/// Occurs when the <see cref="RoutedCommand"/> needs to determine whether it can execute.
/// </summary>
/// <param name="sender">The sender of the event.</param>
/// <param name="e">A <see cref="CanExecuteRoutedEventArgs"/> that contains the event data.</param>
private void OnFontSizeCanExecute(object sender, CanExecuteRoutedEventArgs e)
{
DoubleValueCommandParameter parameter = e.Parameter as DoubleValueCommandParameter;
if ((parameter != null) && (!this.IsPreviewModeActive))
{
parameter.UpdatedValue = this.SelectionFontSize;
parameter.Handled = true;
}
e.CanExecute = true;
}
