private void dataGrid_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button.HasFlag(MouseButtons.Left))
{
// If the mouse moves outside the rectangle, start the drag.
if (dragBoxFromMouseDown != Rectangle.Empty && !dragBoxFromMouseDown.Contains(e.X, e.Y))
{
dataGrid.PreventSelectionChange();
// Prepare drag-n-drop data.
AppListDragData dragData = new AppListDragData(this);
foreach (DataGridViewRow selectedRow in dataGrid.SelectedRows)
{
dragData.Apps.Add((selectedRow.DataBoundItem as GridViewItem).App);
}
// Start drag-n-drop operation.
if (dataGrid.DoDragDrop(dragData, DragDropEffects.Move) == DragDropEffects.Move)
{
// In case of successful move clear the moved items from the library.
foreach (SteamApp movedApp in dragData.Apps)
{
gridViewItems.Remove(gridViewItems.First(i => i.App == movedApp));
}
// Suppress the automatic selection.
dataGrid.ClearSelection();
}
}
}
}
private void dataGrid_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(AppListDragData)))
{
AppListDragData dragData = (AppListDragData)e.Data.GetData(typeof(AppListDragData));
if (dragData.Origin != this)
{
e.Effect = DragDropEffects.Move;
}
}
}
private void dataGrid_DragDrop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(AppListDragData)))
{
AppListDragData dragData = (AppListDragData)e.Data.GetData(typeof(AppListDragData));
if (dragData.Origin != this)
{
e.Effect = DragDropEffects.Move;
// Determine an insert position.
// The height offset is applying to attain more natural inserting behavior:
// items are insert into nearest line between rows.
Point clientPoint = dataGrid.PointToClient(new Point(e.X, e.Y));
int heightOffset = dataGrid.Rows.Count > 0 ? dataGrid.Rows[0].Height / 2 : 0;
var hitInfo = dataGrid.HitTest(clientPoint.X, clientPoint.Y + heightOffset);
int insertIndex = hitInfo.RowIndex >= 0 ? hitInfo.RowIndex : gridViewItems.Count;
// Insert the dragging items into the found position.
foreach (SteamApp app in dragData.Apps.Reverse <SteamApp>())
{
gridViewItems.Insert(insertIndex, new GridViewItem(app));
}
// Select the moved rows.
dataGrid.ClearSelection();
for (int i = insertIndex; i < insertIndex + dragData.Apps.Count; ++i)
{
dataGrid.Rows[insertIndex].Selected = true;
}
// Change the target library.
foreach (SteamApp app in dragData.Apps.Reverse <SteamApp>())
{
app.TargetLibrary = Library;
}
}
}
}
