private static void Control_PreviewMouseDown(object sender, MouseButtonEventArgs e)
{
//if (IsMouseOverScrollbar)
//{
// // 4/13/2007 - Set the flag to false when cursor is over scrollbar.
// canInitiateDrag = false;
// return;
//}
//int index = IndexUnderDragCursor;
//canInitiateDrag = index > -1;
//if (canInitiateDrag)
//{
// Remember the location - PARENT and index of the treeViewItem the user clicked on for later.
if (SelectedTreeViewItem != null)
{
ptMouseDown = MouseUtilities.GetMousePosition(ThisTreeView);
//indexToSelect = index;
//MessageBox.Show(ptMouseDown.X.ToString() + " " + ptMouseDown.Y.ToString());
//e.Handled = true;
}
else
{
ptMouseDown = new Point(-10000, -10000);
indexToSelect = null;// -1;
// e.Handled = true;
}
}
static bool IsMouseOver(Visual target)
{
// We need to use MouseUtilities to figure out the cursor
// coordinates because, during a drag-drop operation, the WPF
// mechanisms for getting the coordinates behave strangely.
Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
Point mousePos = MouseUtilities.GetMousePosition(target);
return(bounds.Contains(mousePos));
}
static void UpdateDragAdornerLocation()
{
if (dragAdorner != null)
{
Point ptCursor = MouseUtilities.GetMousePosition(ThisTreeView);
double left = ptCursor.X - ptMouseDown.X;
// 4/13/2007 - Made the top offset relative to the item being dragged.
TreeViewItem itemBeingDragged = GettreeViewItem(indexToSelect);
Point itemLoc = itemBeingDragged.TranslatePoint(new Point(0, 0), ThisTreeView);
double top = itemLoc.Y + ptCursor.Y - ptMouseDown.Y;
dragAdorner.SetOffsets(left, top);
}
}
static AdornerLayer InitializeAdornerLayer(TreeViewItem itemToDrag)
{
// Create a brush which will paint the treeViewItem onto
// a visual in the adorner layer.
VisualBrush brush = new VisualBrush(SelectedTreeViewItem);
// Create an element which displays the source item while it is dragged.
dragAdorner = new DragAdorner(SelectedTreeViewItem, SelectedTreeViewItem.RenderSize, brush)
{
// Set the drag adorner's opacity.
Opacity = 0.7// DragAdornerOpacity
};
AdornerLayer layer = AdornerLayer.GetAdornerLayer(ThisTreeView);
layer.Add(dragAdorner);
// Save the location of the cursor when the left mouse button was pressed.
ptMouseDown = MouseUtilities.GetMousePosition(ThisTreeView);
return(layer);
}
