public static IObservable <double> SelectValueChanges(SpinnerControl spinnerControl)
{
return(Observable.FromEventPattern <
RoutedPropertyChangedEventHandler <decimal>,
RoutedPropertyChangedEventArgs <double> >(a => spinnerControl.ValueChanged += a, a => spinnerControl.ValueChanged += a)
.Select(a => a.EventArgs.NewValue));
}
private static decimal LimitValueByBounds(decimal newValue, SpinnerControl control)
{
newValue = Math.Max(control.Minimum, Math.Min(control.Maximum, newValue));
// then ensure the number of decimal places is correct.
newValue = decimal.Round(newValue, control.DecimalPlaces);
return(newValue);
}
protected static void OnIncreaseCommand(object sender, ExecutedRoutedEventArgs e)
{
SpinnerControl control = sender as SpinnerControl;
if (control != null)
{
control.OnIncrease();
}
}
private static object CoerceValue(DependencyObject obj, object value)
{
decimal newValue = (decimal)value;
SpinnerControl control = obj as SpinnerControl;
if (control != null)
{
// ensure that the value stays within the bounds of the minimum and
// maximum values that we define.
newValue = LimitValueByBounds(newValue, control);
}
return(newValue);
}
/// <summary>
/// If the value changes, update the text box that displays the Value
/// property to the consumer.
/// </summary>
/// <param name="obj"></param>
/// <param name="args"></param>
private static void OnValueChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
SpinnerControl control = obj as SpinnerControl;
if (control != null)
{
var newValue = (decimal)args.NewValue;
var oldValue = (decimal)args.OldValue;
control.UpdateFormattedValue(newValue);
RoutedPropertyChangedEventArgs <decimal> e =
new RoutedPropertyChangedEventArgs <decimal>(oldValue, newValue, ValueChangedEvent);
control.RaiseEvent(e);
}
}