/// <summary>
/// Invoked when the effective property value of the ViewValue property changes.
/// </summary>
/// <param name="dependencyObject">The DependencyObject on which the property has changed value.</param>
/// <param name="dependencyPropertyChangedEventArgs">Event data that is issued by any event that tracks changes to the effective value of this
/// property.</param>
static void OnValuePropertyChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
{
// Adjust the slider position to reflect the current integral Value using the mapping for the ticks on the slider.
ViewSlider viewSlider = dependencyObject as ViewSlider;
if (viewSlider.Value != Int32.MinValue)
{
((Slider)viewSlider).Value = ViewSlider.smallTicks[viewSlider.Value];
}
}
/// <summary>
/// Called whenever a dependency property value is being re-evaluated, or coercion is specifically requested.
/// </summary>
/// <param name="dependencyObject">The object that the property exists on. When the callback is invoked, the property system will pass this value.</param>
/// <param name="baseValue">The new value of the property, prior to any coercion attempt.</param>
/// <returns>The coerced value (with appropriate type).</returns>
static Object CoerceValuePropertyCallback(DependencyObject dependencyObject, Object baseValue)
{
// Extract the slider and the new value from the generic parameters.
ViewSlider viewSlider = dependencyObject as ViewSlider;
Double newValue = (Double)baseValue;
// When the mouse is used to move the thumb it will snap into place when it is close to an integral view. This provides the snapping logic that moves
// the mouse to an integral position on the slider when it gets close to that value.
if (!viewSlider.inhibitSnap)
{
foreach (Range range in ViewSlider.snappingRange)
{
if (range.Minimum <= newValue && newValue < range.Maximum)
{
baseValue = range.Value;
}
}
}
// When the mouse is not close to a 'Large Tick' position on the slider the value is returned unaltered, but when it is close it will snap into place by
// coercing the value.
return(baseValue);
}
/// <summary>
/// Is invoked whenever application code or internal processes call ApplyTemplate.
/// </summary>
public override void OnApplyTemplate()
{
// Once we've dug down into the templates to find the slider it can be attached to the value property of this control. Moving the slider will change
// the value and any listeners attached to the value of this property will see the change also.
this.viewSlider = this.GetTemplateChild(ViewButtonDropDown.partSlider) as ViewSlider;
}
