private void treeView_DragOver(object sender, DragEventArgs e)
{
try
{
Point currentPosition = e.GetPosition(mainBuilder);
if ((Math.Abs(currentPosition.X - _lastMouseDown.X) > 10.0) ||
(Math.Abs(currentPosition.Y - _lastMouseDown.Y) > 10.0))
{
// Verify that this is a valid drop and then store the drop target
builderItem item = GetNearestContainer(e.OriginalSource as UIElement);
if (CheckDropTarget(draggedItem, item))
{
e.Effects = DragDropEffects.Move;
}
else
{
e.Effects = DragDropEffects.None;
}
}
e.Handled = true;
}
catch (Exception)
{
}
}
private bool CheckDropTarget(builderItem _sourceItem, builderItem _targetItem)
{
//Check whether the target item is meeting your condition
bool _isEqual = false;
if (!_sourceItem.Header.ToString().Equals(_targetItem.Header.ToString()))
{
_isEqual = true;
}
return(_isEqual);
}
private builderItem GetNearestContainer(UIElement element)
{
// Walk up the element tree to the nearest tree view item.
builderItem container = element as builderItem;
while ((container == null) && (element != null))
{
element = VisualTreeHelper.GetParent(element) as UIElement;
container = element as builderItem;
}
return(container);
}
private void mainBuilder_Drop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent("myFormat"))
{
Point p = e.GetPosition(mainBuilder);
Core.ToolBox.Tool tool = e.Data.GetData("myFormat") as Core.ToolBox.Tool;
TreeView treeView = sender as TreeView;
builderItem itemToAdd = new builderItem();
itemToAdd.builderTool = tool;
itemToAdd.Header = tool.toolHeader;
treeView.Items.Add(itemToAdd);
}
}
public void addChild(builderItem _sourceItem, builderItem _targetItem)
{
// add item in target customTreeViewItem
builderItem item1 = new builderItem();
item1.Header = _sourceItem.Header;
item1.builderTool = _sourceItem.builderTool;
_targetItem.Items.Add(item1);
foreach (builderItem item in _sourceItem.Items)
{
addChild(item, item1);
}
}
private void treeView_Drop(object sender, DragEventArgs e)
{
try
{
e.Effects = DragDropEffects.None;
e.Handled = true;
// Verify that this is a valid drop and then store the drop target
builderItem TargetItem = GetNearestContainer(e.OriginalSource as UIElement);
if (TargetItem != null && draggedItem != null)
{
_target = TargetItem;
e.Effects = DragDropEffects.Move;
}
}
catch (Exception)
{
}
}
private void CopyItem(builderItem _sourceItem, builderItem _targetItem)
{
try
{
//adding dragged customTreeViewItem in target customTreeViewItem
addChild(_sourceItem, _targetItem);
//finding Parent customTreeViewItem of dragged customTreeViewItem
builderItem ParentItem = FindVisualParent <builderItem>(_sourceItem);
// if parent is null then remove from TreeView else remove from Parent customTreeViewItem
if (ParentItem == null)
{
mainBuilder.Items.Remove(_sourceItem);
}
else
{
ParentItem.Items.Remove(_sourceItem);
}
}
catch
{
}
//}
}
private void treeView_MouseMove(object sender, MouseEventArgs e)
{
try
{
if (e.LeftButton == MouseButtonState.Pressed)
{
Point currentPosition = e.GetPosition(mainBuilder);
if ((Math.Abs(currentPosition.X - _lastMouseDown.X) > 10.0) ||
(Math.Abs(currentPosition.Y - _lastMouseDown.Y) > 10.0))
{
draggedItem = (builderItem)mainBuilder.SelectedItem;
if (draggedItem != null)
{
DragDropEffects finalDropEffect = DragDrop.DoDragDrop(mainBuilder, mainBuilder.SelectedValue,
DragDropEffects.Move);
//Checking target is not null and item is dragging(moving)
if ((finalDropEffect == DragDropEffects.Move) && (_target != null))
{
// A Move drop was accepted
if (!draggedItem.Header.ToString().Equals(_target.Header.ToString()))
{
CopyItem(draggedItem, _target);
_target = null;
draggedItem = null;
}
}
}
}
}
}
catch (Exception)
{
}
}