protected override IList <AutomationPeer> GetChildrenCore()
{
Controls.TreeView owner = OwnerTreeView;
ItemCollection items = owner.Items;
if (items.Count <= 0)
{
return(null);
}
List <AutomationPeer> peers = new List <AutomationPeer>(items.Count);
for (int i = 0; i < items.Count; i++)
{
Controls.TreeViewItem element = owner.ItemContainerGenerator.ContainerFromIndex(i) as Controls.TreeViewItem;
if (element != null)
{
peers.Add(
FrameworkElementAutomationPeer.FromElement(element) ??
FrameworkElementAutomationPeer.CreatePeerForElement(element));
}
}
return(peers);
}
/// <summary>
/// Adds the current element to the collection of selected items.
/// </summary>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
void ISelectionItemProvider.AddToSelection()
{
Controls.TreeViewItem owner = OwnerTreeViewItem;
Controls.TreeView parent = owner.ParentTreeView;
if (parent == null || (parent.SelectedItem != null && parent.SelectedContainer != Owner))
{
throw new InvalidOperationException(/*Controls.Properties.Resources.Automation_OperationCannotBePerformed*/);
}
owner.IsSelected = true;
}
/// <summary>
/// Hides all nodes, controls, or content that are descendants of the
/// control.
/// </summary>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
void IExpandCollapseProvider.Collapse()
{
if (!IsEnabled())
{
throw new ElementNotEnabledException();
}
Controls.TreeViewItem owner = OwnerTreeViewItem;
if (!owner.HasItems)
{
throw new InvalidOperationException(/*Controls.Properties.Resources.Automation_OperationCannotBePerformed*/);
}
owner.IsExpanded = false;
}
/// <summary>
/// Retrieves a UI automation provider for each child element that is
/// selected.
/// </summary>
/// <returns>An array of UI automation providers.</returns>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
IRawElementProviderSimple[] ISelectionProvider.GetSelection()
{
IRawElementProviderSimple[] selection = null;
Controls.TreeViewItem selectedItem = OwnerTreeView.SelectedContainer;
if (selectedItem != null)
{
AutomationPeer peer = FrameworkElementAutomationPeer.FromElement(selectedItem);
if (peer != null)
{
selection = new IRawElementProviderSimple[] { ProviderFromPeer(peer) };
}
}
return(selection ?? new IRawElementProviderSimple[] { });
}
/// <summary>
/// Scrolls the content area of a container object in order to display
/// the control within the visible region (viewport) of the container.
/// </summary>
/// <remarks>
/// This API supports the .NET Framework infrastructure and is not
/// intended to be used directly from your code.
/// </remarks>
void IScrollItemProvider.ScrollIntoView()
{
// Note: WPF just calls BringIntoView on the current TreeViewItem.
// This actually raises an event that can be handled by the
// its containers. Silverlight doesn't support this, so we will
// approximate by moving scrolling the TreeView's ScrollHost to the
// item.
// Get the parent TreeView
Controls.TreeViewItem owner = OwnerTreeViewItem;
Controls.TreeView parent = owner.ParentTreeView;
if (parent == null)
{
return;
}
// Scroll the item into view
parent.ItemsControlHelper.ScrollIntoView(owner);
}
/// <summary>
/// Initializes a new instance of the
/// <see cref="T:System.Windows.Automation.Peers.TreeViewItemAutomationPeer" />
/// class.
/// </summary>
/// <param name="owner">
/// The <see cref="T:System.Windows.Controls.TreeViewItem" /> instance
/// to associate with this
/// <see cref="T:System.Windows.Automation.Peers.TreeViewItemAutomationPeer" />.
/// </param>
public TreeViewItemAutomationPeer(Controls.TreeViewItem owner)
: base(owner)
{
}
