private void Move()
{
if (_draggingContainer.ItemContainerGenerator.Status != GeneratorStatus.ContainersGenerated)
{
return;
}
var screenPos = new Win32.POINT();
if (!Win32.GetCursorPos(ref screenPos))
{
return;
}
var posToPanel = treeView.PointFromScreen(new Point(screenPos.X, screenPos.Y));
var draggingRect = new Rect(posToPanel.X - _cacheMouseDownPosToChild.X, posToPanel.Y - _cacheMouseDownPosToChild.Y, _draggingContainer.ActualWidth, _draggingContainer.ActualHeight);
if (DoubleUtil.GreaterThan(draggingRect.X, treeView.ActualWidth * 3 / 4) ||
DoubleUtil.LessThan(draggingRect.Right, treeView.ActualWidth / 4) ||
DoubleUtil.LessThan(draggingRect.Bottom, 0) ||
DoubleUtil.GreaterThan(draggingRect.Y, treeView.ActualHeight))
{
return;
}
var sourcePos = _draggingContainer.TranslatePoint(new Point(), treeView);
var isSuccess = false;
if (MoveDirection(sourcePos, draggingRect))
{
isSuccess = MoveUp(treeView, draggingRect, ref _draggingContainer, ref _lastOverlapContainer, ref _startOverlapTime);
}
else
{
isSuccess = MoveDown(treeView, draggingRect, ref _draggingContainer, ref _lastOverlapContainer, ref _startOverlapTime);
}
if (isSuccess && _draggingContainer != null)
{
_draggingContainer.Focus();
_draggingContainer.Opacity = 0.2;
_testSource.ItemsChangedFlag = !_testSource.ItemsChangedFlag;
}
}
private bool MoveDown(MultiSelectTreeView rootTreeView, Rect draggingRect, ref MultiSelectTreeViewItem draggingContainer, ref MultiSelectTreeViewItem lastOverlapContainer, ref DateTime startOverlapTime)
{
Size overlapSize = new Size();
Rect overlapItemRect = new Rect();
MultiSelectTreeViewItem overlapContainer = null;
var sourceItemsControl = ItemsControl.ItemsControlFromItemContainer(draggingContainer);
if (sourceItemsControl == null)
{
return(false);
}
var sourceCollection = sourceItemsControl.ItemsSource as IList <TestModel>;
var sourceIndex = sourceItemsControl.ItemContainerGenerator.IndexFromContainer(draggingContainer);
var sourceItem = sourceCollection[sourceIndex];
var sourcePos = draggingContainer.TranslatePoint(new Point(), rootTreeView);
//从组中分离
if (IsFromGroup(sourceItemsControl) && sourceIndex == sourceItemsControl.Items.Count - 1 && DoubleUtil.GreaterThan(draggingRect.Y, sourcePos.Y + draggingContainer.ActualHeight / 2))
{
//加入上层集合
var superItemsControl = ItemsControl.ItemsControlFromItemContainer(sourceItemsControl);
var superCollection = superItemsControl.ItemsSource as IList <TestModel>;
var superIndex = superItemsControl.ItemContainerGenerator.IndexFromContainer(sourceItemsControl);
sourceCollection.RemoveAt(sourceIndex);
if (superIndex + 1 < superItemsControl.Items.Count)
{
superCollection.Insert(superIndex + 1, sourceItem);
draggingContainer = ContainerFromIndex(superItemsControl, superIndex + 1) as MultiSelectTreeViewItem;
}
else
{
superCollection.Add(sourceItem);
draggingContainer = ContainerFromIndex(superItemsControl, superCollection.Count - 1) as MultiSelectTreeViewItem;
}
//原组若剩余一项，则将该项加入上层集合，移除组
if (sourceItemsControl.Items.Count == 1)
{
sourceItem = sourceCollection[0];
sourceCollection.RemoveAt(0);
superCollection.Insert(superIndex + 1, sourceItem);
superCollection.RemoveAt(superIndex);
}
lastOverlapContainer = null;
return(true);
}
if (!FindFirstDownItemWithValidOverlap(rootTreeView, sourceItemsControl, sourceIndex + 1, draggingContainer, draggingRect, ref overlapSize, ref overlapItemRect, ref overlapContainer))
{
return(false);
}
var targetItemsControl = ItemsControl.ItemsControlFromItemContainer(overlapContainer);
var targetCollection = targetItemsControl.ItemsSource as IList <TestModel>;
var targetIndex = targetItemsControl.ItemContainerGenerator.IndexFromContainer(overlapContainer);
if (DoubleUtil.LessThan(draggingRect.Bottom, overlapItemRect.Y + overlapItemRect.Height / 2))
{
//Do noting
}
else if (DoubleUtil.LessThan(draggingRect.Bottom, overlapItemRect.Y + overlapItemRect.Height * 3 / 4)) // 1/4 -> 3/4 height
{
//非同组，则加入
if (IsFromGroup(targetItemsControl) && targetItemsControl != sourceItemsControl)
{
sourceCollection.RemoveAt(sourceIndex);
targetCollection.Insert(0, sourceItem);
lastOverlapContainer = null;
draggingContainer = ContainerFromIndex(targetItemsControl, 0) as MultiSelectTreeViewItem;
}
}
else if (DoubleUtil.GreaterThan(draggingRect.Y, overlapItemRect.Y + overlapItemRect.Height / 4)) //Top -> 1/4 height 移动
{
sourceCollection.RemoveAt(sourceIndex);
targetCollection.Insert(targetIndex, sourceItem);
lastOverlapContainer = null;
draggingContainer = ContainerFromIndex(targetItemsControl, targetIndex) as MultiSelectTreeViewItem;
}
else //处理悬停，创建新组
{
if (!DealHover(
targetItemsControl, targetCollection, targetIndex,
sourceCollection, sourceIndex, sourceItem,
targetIndex - 1, overlapContainer,
ref lastOverlapContainer, ref startOverlapTime))
{
return(false);
}
}
return(true);
}
