private void OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (!_treeView.HasItems || e.OriginalSource.GetType().Name == "TextBoxView")
{
return;
}
_mouseDownPos = e.GetPosition(_treeView);
var result = VisualTreeHelper.HitTest(_treeView, _mouseDownPos.Value);
if (result == null)
{
return;
}
var treeViewItem = TreeUtil.FindVisualParent <TItem>(result.VisualHit);
if (treeViewItem == null)
{
return;
}
Init(treeViewItem, e);
}
private TItem GetOverlapItem(TContainer rootTreeView, Point draggingPoint)
{
//TODO X Offset
var result = VisualTreeHelper.HitTest(rootTreeView, new Point(rootTreeView.ActualWidth - 30, draggingPoint.Y));
if (result == null)
{
return(null);
}
var overlapContainer = TreeUtil.FindVisualParent <TItem>(result.VisualHit);
//overlapContainer 有可能是已经被折叠的子节点，故通过 IsVisible 来判断
if (overlapContainer == null || !overlapContainer.IsVisible)
{
return(null);
}
TItem overlapItem = null;
if (JustOverlapGroup)
{
if (overlapContainer.HasItems || IsGroup != null && IsGroup(overlapContainer))
{
overlapItem = overlapContainer;
}
else
{
overlapItem = ItemsControl.ItemsControlFromItemContainer(overlapContainer) as TItem;
}
}
else
{
overlapItem = overlapContainer;
}
if (overlapItem != null)
{
var overlapItemPos = overlapItem.TranslatePoint(new Point(), rootTreeView);
var checkHeight = DoubleUtil.IsNaN(OverlapAreaCheckHeight) ? overlapItem.ActualHeight : OverlapAreaCheckHeight;
if (DoubleUtil.GreaterThan(draggingPoint.Y, overlapItemPos.Y) && DoubleUtil.LessThanOrClose(draggingPoint.Y, overlapItemPos.Y + checkHeight / 2))
{
_overDragArea = OverlapArea.Inner;
_overDragArea |= OverlapArea.Up;
}
if (DoubleUtil.GreaterThan(draggingPoint.Y, overlapItemPos.Y + checkHeight / 2) && DoubleUtil.LessThanOrClose(draggingPoint.Y, overlapItemPos.Y + checkHeight))
{
_overDragArea = OverlapArea.Inner;
_overDragArea |= OverlapArea.Down;
}
}
else
{
_overDragArea = OverlapArea.Inner;
}
return(overlapItem);
}
private TItem GetOverlapItem(TContainer rootTreeView, Point draggingPoint)
{
//TODO X Offset
var result = VisualTreeHelper.HitTest(rootTreeView, draggingPoint);
if (result == null)
{
return(null);
}
var overlapContainer = TreeUtil.FindVisualParent <TItem>(result.VisualHit);
//overlapContainer 有可能是已经被折叠的子节点，故通过 IsVisible 来判断
if (overlapContainer == null || !overlapContainer.IsVisible)
{
return(null);
}
_overDragArea = OverlapArea.Inner;
if (overlapContainer != null)
{
var overlapItemPos = overlapContainer.TranslatePoint(new Point(), rootTreeView);
if (DoubleUtil.LessThanOrClose(draggingPoint.Y, overlapItemPos.Y + overlapContainer.ActualHeight / 2))
{
_overDragArea |= OverlapArea.Up;
}
else
{
_overDragArea |= OverlapArea.Down;
}
if (DoubleUtil.LessThanOrClose(draggingPoint.X, overlapItemPos.X + overlapContainer.ActualWidth / 2))
{
_overDragArea |= OverlapArea.Left;
}
else
{
_overDragArea |= OverlapArea.Right;
}
}
return(overlapContainer);
}