/// <summary>
/// DisplayValueProperty property changed handler.
/// </summary>
/// <param name="oldValue">The old value.</param>
/// <param name="newValue">The new value.</param>
private void OnDisplayValueChanged(double oldValue, double newValue) {
if (!_settingDisplayValue) {
_settingDisplayValue = true;
this.DisplayValue = oldValue;
throw new InvalidOperationException(string.Format(CultureInfo.CurrentUICulture, "Properties.Resources.InvalidAttemptToChangeReadOnlyProperty", "DisplayValue"));
}
else {
if (newValue <= 0.0) {
VisualStates.GoToState(this, true, StateEmpty);
}
else if (newValue >= 1.0) {
VisualStates.GoToState(this, true, StateFilled);
}
else {
VisualStates.GoToState(this, true, StatePartial);
}
}
}
/// <summary>
/// Updates the hover states of the rating items.
/// </summary>
private void UpdateHoverStates()
{
if (HoveredRatingItem != null && !IsReadOnly)
{
IList <RatingItem> ratingItems = GetRatingItems().ToList();
int indexOfItem = ratingItems.IndexOf(HoveredRatingItem);
double total = ratingItems.Count();
double filled = indexOfItem + 1;
this.DisplayValue = filled / total;
for (int cnt = 0; cnt < ratingItems.Count; cnt++)
{
RatingItem ratingItem = ratingItems[cnt];
if (cnt <= indexOfItem && this.SelectionMode == RatingSelectionMode.Continuous)
{
VisualStates.GoToState(ratingItem, true, VisualStates.StateMouseOver);
}
else
{
IUpdateVisualState updateVisualState = (IUpdateVisualState)ratingItem;
updateVisualState.UpdateVisualState(true);
}
}
}
else
{
this.DisplayValue = this.Value.GetValueOrDefault();
foreach (IUpdateVisualState updateVisualState in GetRatingItems().OfType <IUpdateVisualState>())
{
updateVisualState.UpdateVisualState(true);
}
}
}