/// <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;
DisplayValue = oldValue;
throw new InvalidOperationException(string.Format(CultureInfo.CurrentUICulture, $"Invalid attempt to change read-only property DisplayValue."));
}
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 state of the visual.
/// </summary>
/// <param name="useTransitions">If set to <c>true</c> use transitions.</param>
/// <remarks>The header will follow the parent accordionitem states.</remarks>
internal virtual void UpdateVisualState(bool useTransitions)
{
// the visualstate of the header is completely dependent on the parent state.
if (ParentAccordionItem == null)
{
return;
}
if (ParentAccordionItem.IsSelected)
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateExpanded);
}
else
{
VisualStates.GoToState(this, useTransitions, VisualStates.StateCollapsed);
}
switch (ParentAccordionItem.ExpandDirection)
{
// no animations on an expanddirection change.
case ExpandDirection.Down:
VisualStates.GoToState(this, false, VisualStates.StateExpandDown);
break;
case ExpandDirection.Up:
VisualStates.GoToState(this, false, VisualStates.StateExpandUp);
break;
case ExpandDirection.Left:
VisualStates.GoToState(this, false, VisualStates.StateExpandLeft);
break;
default:
VisualStates.GoToState(this, false, VisualStates.StateExpandRight);
break;
}
}
/// <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;
DisplayValue = filled / total;
for (int cnt = 0; cnt < ratingItems.Count; cnt++)
{
RatingItem ratingItem = ratingItems[cnt];
if (cnt <= indexOfItem && SelectionMode == RatingSelectionMode.Continuous)
{
VisualStates.GoToState(ratingItem, true, VisualStates.StateMouseOver);
}
else
{
IUpdateVisualState updateVisualState = ratingItem;
updateVisualState.UpdateVisualState(true);
}
}
}
else
{
DisplayValue = Value.GetValueOrDefault();
foreach (IUpdateVisualState updateVisualState in GetRatingItems().OfType <IUpdateVisualState>())
{
updateVisualState.UpdateVisualState(true);
}
}
}
