/// <summary>
/// The on value changed.
/// </summary>
/// <param name="dependencyObject"> The dependency object. </param>
/// <param name="e"> The Event Arguments. </param>
private static void OnValueChanged(
DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs e)
{
ElasticListBoxItem listBoxItem = (ElasticListBoxItem)dependencyObject;
ElasticListBox listBox = listBoxItem.ParentListBox;
// Update the total.
var items = listBox.Items
.Cast <object>()
.Select(x => listBoxItem.ParentListBox.ItemContainerGenerator.ContainerFromItem(x))
.Where(x => x != null)
.Cast <ElasticListBoxItem>();
listBox.Total = items.Sum(x => x.Value);
// Update the percentage.
foreach (var item in items)
{
if (listBox.Total == 0D)
{
item.Percentage = 0D;
item.PercentageOpacity = listBoxItem.MinOpacity;
}
else
{
item.Percentage = item.Value / listBox.Total;
item.PercentageOpacity = Math.Max(listBoxItem.MinOpacity, item.Percentage);
}
}
listBox.ResizeItems();
}
/// <summary>
/// The on is highlighted changed.
/// </summary>
/// <param name="dependencyObject"> The dependency object. </param>
/// <param name="e"> The Event Arguments. </param>
private static void OnIsHighlightedChanged(
DependencyObject dependencyObject,
DependencyPropertyChangedEventArgs e)
{
ElasticListBoxItem listBoxItem = (ElasticListBoxItem)dependencyObject;
ElasticListBox listBox = listBoxItem.ParentListBox;
listBox.ResizeItems();
}
/// <summary>
/// Gets the height of the specified list box item.
/// </summary>
/// <param name="listBoxItem">The list box item.</param>
/// <returns>The height.</returns>
private double GetHeight(ElasticListBoxItem listBoxItem)
{
double height;
if (listBoxItem.IsHighlighted)
{
height = 0;
}
else
{
height = listBoxItem.MinHeight;
}
return(height);
}