/// <summary>
/// Updates the values of the rating items.
/// </summary>
private void UpdateValues()
{
IList <RatingItem> ratingItems = GetRatingItems().ToList();
RatingItem oldSelectedItem = this.GetSelectedRatingItem();
IEnumerable <Tuple <RatingItem, double> > itemAndWeights =
EnumerableFunctions
.Zip(
ratingItems,
ratingItems
.Select(ratingItem => 1.0)
.GetWeightedValues(WeightedValue),
(item, percent) => Tuple.Create(item, percent));
foreach (Tuple <RatingItem, double> itemAndWeight in itemAndWeights)
{
itemAndWeight.Item1.Value = itemAndWeight.Item2;
}
RatingItem newSelectedItem = this.GetSelectedRatingItem();
if (HoveredRatingItem == null)
{
DisplayValue = WeightedValue;
}
}
/// <summary>
/// Updates the value and actual value of the rating items.
/// </summary>
private void UpdateDisplayValues()
{
IList <RatingItem> ratingItems = GetRatingItems().ToList();
IEnumerable <Tuple <RatingItem, double> > itemAndWeights =
EnumerableFunctions
.Zip(
ratingItems,
ratingItems
.Select(ratingItem => 1.0)
.GetWeightedValues(WeightedValue),
(item, percent) => Tuple.Create(item, percent));
RatingItem selectedItem = null;
Tuple <RatingItem, double> selectedItemAndWeight = itemAndWeights.LastOrDefault(i => i.Item2 > 0.0);
if (selectedItemAndWeight != null)
{
selectedItem = selectedItemAndWeight.Item1;
}
else
{
selectedItem = GetSelectedRatingItem();
}
foreach (Tuple <RatingItem, double> itemAndWeight in itemAndWeights)
{
if (SelectionMode == RatingSelectionMode.Individual && itemAndWeight.Item1 != selectedItem)
{
itemAndWeight.Item1.DisplayValue = 0.0;
}
else
{
itemAndWeight.Item1.DisplayValue = itemAndWeight.Item2;
}
}
}
/// <summary>
/// Updates the hover states of the rating items.
/// </summary>
private void UpdateHoverStates()
{
if (HoveredRatingItem != null && IsEnabled)
{
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.StatePointerOver);
}
else
{
IUpdateVisualState updateVisualState = (IUpdateVisualState)ratingItem;
updateVisualState.UpdateVisualState(true);
}
}
}
else
{
this.DisplayValue = this.Value;
foreach (IUpdateVisualState updateVisualState in GetRatingItems().OfType <IUpdateVisualState>())
{
updateVisualState.UpdateVisualState(true);
}
}
}
/// <summary>
/// Gets a rating item at a certain index offset from another
/// rating item.
/// </summary>
/// <param name="ratingItem">The rating item.</param>
/// <param name="offset">The rating item at an offset from the
/// index of the rating item.</param>
/// <returns>The rating item at the offset.</returns>
private RatingItem GetRatingItemAtOffsetFrom(RatingItem ratingItem, int offset)
{
IList<RatingItem> ratingItems = GetRatingItems().ToList();
int index = ratingItems.IndexOf(ratingItem);
if (index == -1)
{
return null;
}
index += offset;
if (index >= 0 && index < ratingItems.Count)
{
ratingItem = ratingItems[index];
}
else
{
ratingItem = null;
}
return ratingItem;
}
/// <summary>
/// This method is invoked when the rating item value is changed.
/// </summary>
/// <param name="ratingItem">The rating item that has changed.</param>
/// <param name="newValue">The new value.</param>
protected virtual void OnRatingItemValueSelected(RatingItem ratingItem, double newValue)
{
List<RatingItem> ratingItems = GetRatingItems().ToList();
double total = ratingItems.Count();
this.Value = ratingItems.IndexOf(ratingItem) + 1;
}
/// <summary>
/// Selects a rating item.
/// </summary>
/// <param name="selectedRatingItem">The selected rating item.</param>
internal void SelectRatingItem(RatingItem selectedRatingItem)
{
if (this.IsEnabled)
{
IList<RatingItem> ratingItems = GetRatingItems().ToList();
IEnumerable<double> weights = ratingItems.Select(ratingItem => 1.0);
double total = ratingItems.Count();
double percent;
if (total != 0)
{
percent = weights.Take(ratingItems.IndexOf(selectedRatingItem) + 1).Sum() / total;
this.Value = percent;
}
}
}
/// <summary>
/// DisplayValueProperty property changed handler.
/// </summary>
/// <param name="d">RatingItem that changed its DisplayValue.</param>
/// <param name="e">Event arguments.</param>
private static void OnDisplayValueChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
RatingItem source = (RatingItem)d;
source.OnDisplayValueChanged((double)e.OldValue, (double)e.NewValue);
}
