| private UpdateVisualState ( bool useTransitions ) : void | ||
| useTransitions | bool | /// Indicates whether visual transitions should be used. /// |
| Результат | void | |
/// <summary>
/// Triggers the visual state changes and visual transitions
/// to close the list out of selection mode.
/// </summary>
private void CloseSelection()
{
IList <WeakReference> items = ItemsControlExtensions.GetItemsInViewPort(this);
//Only animate the containers in the view port.
foreach (var i in items)
{
MultiselectItem item = (MultiselectItem)(((WeakReference)i).Target);
item.State = SelectionEnabledState.Closed;
item.UpdateVisualState(true);
}
Dispatcher.BeginInvoke(() =>
{
for (int j = 0; j < this.Items.Count; j++)
{
MultiselectItem item = (MultiselectItem)ItemContainerGenerator.ContainerFromIndex(j);
if (item != null)
{
item.State = SelectionEnabledState.Closed;
item.UpdateVisualState(false);
}
}
});
}
/// <summary>
/// Resets new or reused item containers appropiately.
/// </summary>
/// <param name="element"></param>
/// <param name="item"></param>
protected override void PrepareContainerForItemOverride(DependencyObject element, object item)
{
base.PrepareContainerForItemOverride(element, item);
MultiselectItem container = (MultiselectItem)element;
container.Style = this.ItemContainerStyle;
container._isBeingVirtualized = true;
//Select or unselect item containers to put or clear checkmarks.
container.IsSelected = SelectedItems.Contains(item);
//Open or close item containers depending on the selection mode.
container.State = IsSelectionEnabled ? SelectionEnabledState.Opened : SelectionEnabledState.Closed;
container.UpdateVisualState(false);
container._isBeingVirtualized = false;
}