private void DGV_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
var row = GetSelectedDownloadRow();
if (row == null)
{
return;
}
var ht = DGV.HitTest(e.X, e.Y);
if ((ht.RowIndex < 0) || (ht.ColumnIndex < 0))
{
return;
}
if (_DGV_MouseDown_HitTestInfo.Type != DataGridViewHitTestType.Cell)
{
return;
}
const int MOVE_DELTA = 5;
if (Math.Abs(_DGV_MouseDown_ButtonLeft_Location.X - e.X) < MOVE_DELTA &&
Math.Abs(_DGV_MouseDown_ButtonLeft_Location.Y - e.Y) < MOVE_DELTA)
{
return;
}
//-----------------------------------------------------//
_DragOver_RowIndex = null;
DGV.AllowDrop = true;
DGV.DragOver += DGV_DragOver;
DGV.DragDrop += DGV_DragDrop;
DGV.CellPainting += DGV_DragDrop_CellPainting;
try
{
var dragDropEffect = DGV.DoDragDrop(row, DragDropEffects.Move);
if (dragDropEffect == DragDropEffects.Move)
{
SelectDownloadRow(row);
}
else
{
DGV.Invalidate();
}
}
finally
{
DGV.DragOver -= DGV_DragOver;
DGV.DragDrop -= DGV_DragDrop;
DGV.CellPainting -= DGV_DragDrop_CellPainting;
DGV.AllowDrop = false;
}
}