private void DgvCategories_MouseMove(object sender, MouseEventArgs e) { if ((e.Button & MouseButtons.Left) == MouseButtons.Left) { // If the mouse moves outside the rectangle, start the drag. if (dragBoxFromMouseDown != Rectangle.Empty && !dragBoxFromMouseDown.Contains(e.X, e.Y)) { // Proceed with the drag and drop, passing in the list item. DragDropEffects dropEffect = DgvCategories.DoDragDrop( DgvCategories.Rows[rowIndexFromMouseDown], DragDropEffects.Move); } } }
private void DgvCategories_DragDrop(object sender, DragEventArgs e) { // The mouse locations are relative to the screen, so they must be // converted to client coordinates. Point clientPoint = DgvCategories.PointToClient(new Point(e.X, e.Y)); // Get the row index of the item the mouse is below. rowIndexOfItemUnderMouseToDrop = DgvCategories.HitTest(clientPoint.X, clientPoint.Y).RowIndex; // If the drag operation was a move then remove and insert the row. if (e.Effect == DragDropEffects.Move) { DataGridViewRow rowToMove = e.Data.GetData( typeof(DataGridViewRow)) as DataGridViewRow; DgvCategories.Rows.RemoveAt(rowIndexFromMouseDown); DgvCategories.Rows.Insert(rowIndexOfItemUnderMouseToDrop, rowToMove); } }
private void DgvCategories_MouseDown(object sender, MouseEventArgs e) { // Get the index of the item the mouse is below. rowIndexFromMouseDown = DgvCategories.HitTest(e.X, e.Y).RowIndex; if (rowIndexFromMouseDown != -1) { // Remember the point where the mouse down occurred. // The DragSize indicates the size that the mouse can move // before a drag event should be started. Size dragSize = SystemInformation.DragSize; // Create a rectangle using the DragSize, with the mouse position being // at the center of the rectangle. dragBoxFromMouseDown = new Rectangle( new Point(e.X - (dragSize.Width / 2), e.Y - (dragSize.Height / 2)), dragSize); } else { // Reset the rectangle if the mouse is not over an item in the ListBox. dragBoxFromMouseDown = Rectangle.Empty; } }