// See if we should allow this kind of drag.
private void treeView_DragEnter(object sender, DragEventArgs e)
{
TreeView tree = sender as TreeView;
// Allow a Move for DragItem objects that are
// dragged to the control that started the drag.
if (!e.Data.GetDataPresent(typeof(DragItem)))
{
// Not a DragItem. Don't allow it.
e.Effect = DragDropEffects.None;
}
else if ((e.AllowedEffect & DragDropEffects.Move) == 0)
{
// Not a Move. Do not allow it.
e.Effect = DragDropEffects.None;
}
else
{
// Get the DragItem.
DragItem drag_item = (DragItem)e.Data.GetData(typeof(DragItem));
// Verify that this is the control that started the drag.
if (drag_item.Client != listView1)
{
// Not the congtrol that started the drag. Do not allow it.
e.Effect = DragDropEffects.None;
}
else
{
// Allow it.
e.Effect = DragDropEffects.Move;
}
}
}
// Drop the item here.
private void tree_DragDrop(object sender, DragEventArgs e)
{
TreeView tree = sender as TreeView;
// Get the ListBox item data.
DragItem drag_item = (DragItem)e.Data.GetData(typeof(DragItem));
// Get the index of the item at this position.
TreeNode new_node = tree.NodeFromScreenPoint(new Point(e.X, e.Y));
foreach (var item in drag_item.Items)
{
var category = Categories.getCategoryByPath(new_node.FullPath);
item.Item.MoveCategory(category).Update();
}
// Select the item.
tree.SelectedNode = new_node;
treeView1_NodeMouseClick(tree, new TreeNodeMouseClickEventArgs(new_node, MouseButtons.Left, 1, e.X, e.Y));
}
private void listBox1_MouseMove(object sender, MouseEventArgs e)
{
if (!isMouseDown || isDragAndDrop)
{
return;
}
var lst = sender as ListView;
// Find the item under the mouse.
//var point = lst.PointToClient(e.Location);
//var index = lst.GetItemAt(point.X, point.Y) as ListItem;
//lst.SelectedItems = new ListView.SelectedListViewItemCollection(lst) { index as ListItem; };
//if (index < 0) return;
// Drag the item.
DragItem drag_item = new DragItem(lst, lst.SelectedItems.ToArray <ListItem>());
lst.DoDragDrop(drag_item, DragDropEffects.Move);
isDragAndDrop = true;
}