private void TreeViewItemExt_Drop(object sender, DragEventArgs e)
{
TreeViewItemExt tvie = sender as TreeViewItemExt;
if (tvie != null && !tvie.IsDragging && e != null)
{
IDataObject data = e.Data;
if (data.GetDataPresent(typeof(Nodes.Node).ToString()))
{
Nodes.Node payload = data.GetData(typeof(Nodes.Node)) as Nodes.Node;
if (payload != null && this.DragNDropCmd != null)
{
// inform user
string message = string.Format("moving {0}\nto {1}", payload.ToString(), this.Header.ToString());
string caption = "Moving Node";
MessageBoxResult answer = MessageBox.Show(message, caption,
MessageBoxButton.YesNo, MessageBoxImage.Question, MessageBoxResult.No);
if (answer == MessageBoxResult.Yes)
{
// execute drop command
this.DragNDropCmd.Execute(new WinUtils.TwoObjects {
object1 = payload, object2 = this.Header
});
e.Handled = true;
}
// restore the visual style of any containing nodes
TreeViewItemExt.RestoreVisualStylesAfterDrop();
}
}
}
}
protected override DependencyObject GetContainerForItemOverride()
{
TreeViewItemExt container = new TreeViewItemExt();
container.DragNDropCmd = this.DragNDropCmd;
container.Tag = this.Tag + "." + (++this.nr_subnodes).ToString();
return(container);
}
protected override DependencyObject GetContainerForItemOverride()
{
TreeViewItemExt container = new TreeViewItemExt();
container.DragNDropCmd = this.DragNDropCmd;
this.Counter++;
container.Tag = this.Counter.ToString();
return(container);
}
private void TreeViewItemExt_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
TreeViewItemExt tvie = sender as TreeViewItemExt;
if (tvie != null && e != null)
{
this.mouseMove_startingP = e.GetPosition(null);
}
}
private void TreeViewItemExt_DragOver(object sender, DragEventArgs e)
{
TreeViewItemExt tvie = sender as TreeViewItemExt;
if (tvie != null && !tvie.IsDragging && e != null)
{
IDataObject data = e.Data;
if (!data.GetDataPresent(typeof(Nodes.Node).ToString()))
{
e.Effects = DragDropEffects.None;
e.Handled = true;
}
}
}
private void TreeViewItemExt_DragLeave(object sender, DragEventArgs e)
{
TreeViewItemExt tvie = sender as TreeViewItemExt;
if (tvie != null && !tvie.IsDragging)
{
this.CouldBeDropTarget = false;
TreeViewItemExt.drop_target_chain.Remove(this);
System.Windows.Style copy = new Style(typeof(TreeViewItem), this.Style);
copy.Setters.Add(new Setter(TreeViewItem.BorderBrushProperty, TreeViewItemExt.STANDARD));
copy.Setters.Add(new Setter(TreeViewItem.BorderThicknessProperty, new Thickness(0)));
this.Style = copy;
}
}
private static void PropagateDragNDropCmd(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
TreeViewExt tve = d as TreeViewExt;
if (tve != null)
{
foreach (object item in tve.Items)
{
TreeViewItemExt tvie = tve.ItemContainerGenerator.ContainerFromItem(item) as TreeViewItemExt;
if (tvie != null)
{
tvie.DragNDropCmd = tve.DragNDropCmd;
}
}
}
}
// runs from LEAF to ROOT
private void TreeViewItemExt_MouseMove(object sender, MouseEventArgs e)
{
TreeViewItemExt tvie = sender as TreeViewItemExt;
if (tvie != null && e != null)
{
if (!tvie.IsSelected)
{
return;
}
if (e.LeftButton == MouseButtonState.Pressed && !IsDragging)
{
Point pos = e.GetPosition(null);
// check if the mouse moved far enough:
bool enoughX = Math.Abs(pos.X - mouseMove_startingP.X) > 2 * SystemParameters.MinimumHorizontalDragDistance;
bool enoughY = Math.Abs(pos.Y - mouseMove_startingP.Y) > 2 * SystemParameters.MinimumVerticalDragDistance;
if (enoughX || enoughY)
{
this.mouseMove_startingP = pos;
this.StartDrag(e);
}
}
}
}
