private void TreeView_DragLeave_1(object sender, DragEventArgs e)
{
if (sender is StackPanel)
{
return;
}
if (!e.Data.GetDataPresent(typeof(DragInfo)))
{
return;
}
DragInfo data = e.Data.GetData(typeof(DragInfo)) as DragInfo;
if (data == null)
{
return;
}
if (data.PanelID != TreeID)
{
return;
}
Border panel = GetBorderFromMousePos(e);
if (panel == null)
{
if (_DragOverItem != null)
{
_DragOverItem.BorderThickness = new Thickness(0);
}
_DragOverItem = null;
}
}
private void Border_Drop(object sender, DragEventArgs e)
{
if (DragInsertEvent == null)
{
return;
}
if (!e.Data.GetDataPresent(typeof(DragInfo)))
{
return;
}
DragInfo data = e.Data.GetData(typeof(DragInfo)) as DragInfo;
Border panel = _DragOverItem;
if (panel != null && panel != data.DragFrom && TreeID == data.PanelID)
{
panel.BorderThickness = new Thickness(0);
DragInsertEventArgs insertEvent = new DragInsertEventArgs();
insertEvent.DragFrom = data.DragFrom.DataContext;
insertEvent.DragTo = panel.DataContext;
if (!_IsButtom)
{
insertEvent.IsDropFront = true;
}
else
{
insertEvent.IsDropFront = false;
}
DragInsertEvent(this, insertEvent);
}
else
{
if (_DragOverItem != null)
{
_DragOverItem.BorderThickness = new Thickness(0);
}
}
}
private void TreeView_DragOver(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(typeof(DragInfo)))
{
return;
}
DragInfo data = e.Data.GetData(typeof(DragInfo)) as DragInfo;
if (data == null)
{
return;
}
if (data.PanelID != TreeID)
{
return;
}
Border panel = GetBorderFromMousePos(e);
if (panel != null && panel != data.DragFrom && TreeID == data.PanelID)
{
if (_TreeView.Items[_TreeView.Items.Count - 1] == panel.DataContext)
{
Point point = e.GetPosition(panel);
if (point.Y < panel.ActualHeight * 0.5d)
{
_IsButtom = false;
panel.BorderThickness = new Thickness(0, 5, 0, 0);
}
else
{
_IsButtom = true;
panel.BorderThickness = new Thickness(0, 0, 0, 5);
}
}
}
}
private void Border_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (DragInsertEvent == null)
{
return;
}
Border panel = GetBorderFromMousePos(e);
if (panel == null)
{
return;
}
if (e.LeftButton == MouseButtonState.Pressed && _TreeView.SelectedItem != null)
{
DragInfo dragInfo = new DragInfo();
dragInfo.PanelID = TreeID;
dragInfo.DragFrom = panel;
DataObject data = new DataObject(typeof(DragInfo), dragInfo);
DragDrop.DoDragDrop(this, data, DragDropEffects.Move);
}
}
private void TreeView_DragEnter_1(object sender, DragEventArgs e)
{
if (!e.Data.GetDataPresent(typeof(DragInfo)))
{
return;
}
DragInfo data = e.Data.GetData(typeof(DragInfo)) as DragInfo;
if (data == null)
{
return;
}
if (data.PanelID != TreeID)
{
return;
}
Border panel = GetBorderFromMousePos(e);
if (panel == null)
{
return;
}
if (panel != null && TreeID == data.PanelID)
{
//清理之前的
if (_DragOverItem != null)
{
_DragOverItem.BorderThickness = new Thickness(0);
}
_DragOverItem = panel;
if (_TreeView.Items[_TreeView.Items.Count - 1] == panel.DataContext)
{
Point point = e.GetPosition(panel);
if (point.Y < panel.ActualHeight * 0.5d)
{
_IsButtom = false;
panel.BorderThickness = new Thickness(0, 5, 0, 0);
}
else
{
_IsButtom = true;
panel.BorderThickness = new Thickness(0, 0, 0, 5);
}
}
else
{
_IsButtom = false;
panel.BorderThickness = new Thickness(0, 5, 0, 0);
}
}
else
{
//e.Effects = DragDropEffects.None;
}
//是否需要滚动
Point panelPos = e.GetPosition(_TreeViewPanel);
if (panelPos.Y < panel.ActualHeight)
{
_ScrollViewer.ScrollToVerticalOffset(_ScrollViewer.VerticalOffset - panel.ActualHeight);
}
else if (panelPos.Y > (this.ActualHeight - panel.ActualHeight))
{
_ScrollViewer.ScrollToVerticalOffset(_ScrollViewer.VerticalOffset + panel.ActualHeight);
}
}
