/// <summary>
/// Handles the PreviewMouseLeftButtonDown event on the drag source.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The event args.</param>
private void DragSourcePreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
this.sourceItemsControl = (TreeListBox)sender;
var visual = e.OriginalSource as Visual;
this.topWindow = Window.GetWindow(this.sourceItemsControl);
this.initialMousePosition = e.GetPosition(this.topWindow);
this.sourceItemContainer = visual != null
? this.sourceItemsControl.ContainerFromElement(visual) as TreeListBoxItem
: null;
if (this.sourceItemContainer != null)
{
this.draggedData = new List <IDragSource>();
this.draggedData.Add(this.sourceItemContainer.DataContext);
// todo: how to drag multiple items?
// must set e.Handled = true to avoid items being deselected
// foreach (var si in sourceItemsControl.SelectedItems) this.draggedData.Add(si);
}
else
{
this.draggedData = null;
}
}
/// <summary>
/// Handles the PreviewDragEnter event on the drop target.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The event args.</param>
private void DropTargetPreviewDragEnter(object sender, DragEventArgs e)
{
this.targetItemsControl = (TreeListBox)sender;
object draggedItems = e.Data.GetData(this.format.Name);
if (draggedItems != null)
{
this.DecideDropTarget(e);
this.UpdateAdorner();
e.Handled = true;
}
}
/// <summary>
/// Handles the PreviewDragEnter event on the drop target.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The event args.
/// </param>
private void DropTargetPreviewDragEnter(object sender, DragEventArgs e)
{
this.targetItemsControl = (TreeListBox)sender;
object draggedItems = e.Data.GetData(this.format.Name);
if (draggedItems != null)
{
this.DecideDropTarget(e);
this.UpdateAdorner();
e.Handled = true;
}
}
/// <summary>
/// Handles the PreviewMouseLeftButtonDown event on the drag source.
/// </summary>
/// <param name="sender">
/// The sender.
/// </param>
/// <param name="e">
/// The event args.
/// </param>
private void DragSourcePreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
this.sourceItemsControl = (TreeListBox)sender;
var visual = e.OriginalSource as Visual;
this.topWindow = Window.GetWindow(this.sourceItemsControl);
this.initialMousePosition = e.GetPosition(this.topWindow);
this.sourceItemContainer = visual != null
? this.sourceItemsControl.ContainerFromElement(visual) as TreeListBoxItem
: null;
if (this.sourceItemContainer != null)
{
this.draggedData = new List<IDragSource>();
this.draggedData.Add(this.sourceItemContainer.DataContext);
// todo: how to drag multiple items?
// must set e.Handled = true to avoid items being deselected
// foreach (var si in sourceItemsControl.SelectedItems) this.draggedData.Add(si);
}
else
{
this.draggedData = null;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="TreeListBoxAutomationPeer"/> class.
/// </summary>
/// <param name="owner">The owner.</param>
public TreeListBoxAutomationPeer(TreeListBox owner)
: base(owner)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="TreeListBoxItem"/> class.
/// </summary>
/// <param name="parent">
/// The parent.
/// </param>
public TreeListBoxItem(TreeListBox parent)
{
// The following is not working when TreeListBoxItems are disconnected...
// ItemsControl.ItemsControlFromItemContainer(this) as TreeListBox;
this.ParentTreeListBox = parent;
this.ChildItems = new List<TreeListBoxItem>();
}
/// <summary>
/// Initializes a new instance of the <see cref="TreeListBoxAutomationPeer"/> class.
/// </summary>
/// <param name="owner">The owner.</param>
public TreeListBoxAutomationPeer(TreeListBox owner)
: base(owner)
{
}