public void SelectItem(TreeViewItem item)
{
SelectedItem = item;
// Update IsSelected flags of all TreeViewItems.
foreach (var descendant in UIHelper.GetDescendants(this).OfType<TreeViewItem>())
descendant.IsSelected = (descendant == item);
}
// Called after the tree view control has processed device input.
private void OnTreeViewInputProcessed(object sender, InputEventArgs eventArgs)
{
var treeView = (TreeView)sender;
var selectedItem = treeView.SelectedItem;
var inputService = treeView.InputService;
if (!inputService.IsMouseOrTouchHandled // Mouse was not handled before?
&& inputService.IsDoubleClick(MouseButtons.Left) // Double-click detected?
&& selectedItem == _lastSelectedItem // Both clicks were on the same item?
&& selectedItem != null // Any item is selected?
&& selectedItem.IsMouseOver) // The mouse is over the selected item?
{
// A tree view item was double-clicked. Show a message box with the data of the item.
// This is only for debugging, so we simply use the Windows Forms MessageBox.
#if WINDOWS
MessageBox.Show((string)selectedItem.UserData);
#endif
}
// Remember the selected item. This is necessary because we must be able to check if both
// clicks of the double-click were on the same item. When a tree view item is clicked,
// it is selected. Clicking two different items in rapid succession should not count as
// a double-click.
_lastSelectedItem = selectedItem;
}
