/// <summary>
/// Removes an entry from the item-container dictionary.
/// </summary>
/// <param name="element">The item container.</param>
/// <param name="item">The text item.</param>
protected override void ClearContainerForItemOverride(DependencyObject element, object item)
{
base.ClearContainerForItemOverride(element, item);
DecoratorTextBoxItem textItem = (DecoratorTextBoxItem)item;
DecoratorItemContainer container = (DecoratorItemContainer)element;
this.containers.Remove(container);
if (textItem != null && this.containersByItem.ContainsKey(textItem))
{
this.containersByItem.Remove(textItem);
}
}
/// <summary>
/// Sets up the bindings for whether a term is encodable or not, and stores
/// in the item-container dictionary.
/// </summary>
/// <param name="element">The decorator container.</param>
/// <param name="item">The text item.</param>
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
DecoratorItemContainer container = (DecoratorItemContainer)element;
DecoratorTextBoxItem textItem = (DecoratorTextBoxItem)item;
this.containersByItem.Add(textItem, container);
container.DataContext = textItem;
container.SetBinding(DecoratorItemContainer.IsEncodableProperty, new System.Windows.Data.Binding("IsEncodable"));
container.SetBinding(DecoratorItemContainer.IsEncodedProperty, new System.Windows.Data.Binding("IsEncoded"));
container.SetBinding(DecoratorItemContainer.ContainerPositionProperty, new System.Windows.Data.Binding("ContainerPosition"));
container.SetBinding(DecoratorItemContainer.IsMouseHighlightedProperty, new System.Windows.Data.Binding("IsMouseHighlighted"));
container.SetBinding(DecoratorItemContainer.IsFocusHighlightedProperty, new System.Windows.Data.Binding("IsFocusHighlighted"));
}
/// <summary>
/// Generates a DecoratorItemContainer with template.
/// </summary>
/// <returns>A decorator item container.</returns>
protected override DependencyObject GetContainerForItemOverride()
{
DecoratorItemContainer container = new DecoratorItemContainer();
if (this.DecoratorItemContainerStyle != null)
{
container.Style = this.DecoratorItemContainerStyle;
}
if (this.containers.Count > 0)
{
container.Top = this.containers[containers.Count - 1].Top + this.containers[this.containers.Count - 1].ActualHeight;
}
this.containers.Add(container);
return(container);
}
/// <summary>
/// Updates the scroll viewer position.
/// </summary>
/// <param name="index">The current item index.</param>
private void UpdateScrollViewer(int index)
{
if (index < this.textBoxItems.Count)
{
DecoratorItemContainer container = this.decoratorItemsControl.GetContainerFromItem(this.textBoxItems[index]);
if (container != null && this.scrollViewer != null)
{
if (this.scrollViewer.VerticalOffset > container.Top)
{
this.scrollViewer.ScrollToVerticalOffset(container.Top - 5);
}
else if (this.scrollViewer.VerticalOffset + this.scrollViewer.ViewportHeight < container.Top + container.ActualHeight)
{
this.scrollViewer.ScrollToVerticalOffset(
container.Top + container.ActualHeight - this.scrollViewer.ViewportHeight + 5);
}
}
}
}
/// <summary>
/// Generates a DecoratorItemContainer with template.
/// </summary>
/// <returns>A decorator item container.</returns>
protected override DependencyObject GetContainerForItemOverride()
{
DecoratorItemContainer container = new DecoratorItemContainer();
if (this.DecoratorItemContainerStyle != null)
{
container.Style = this.DecoratorItemContainerStyle;
}
if (this.containers.Count > 0)
{
container.Top = this.containers[containers.Count - 1].Top + this.containers[this.containers.Count - 1].ActualHeight;
}
this.containers.Add(container);
return container;
}
/// <summary>
/// Updates the visual state of the control.
/// </summary>
/// <param name="dependencyObject">The instance of the container control.</param>
/// <param name="args">Dependency Property Changed Event Args.</param>
private static void OnStateChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs args)
{
DecoratorItemContainer container = (DecoratorItemContainer)dependencyObject;
container.UpdateVisualState(true);
}