ListTransferHandler.java 文件源码

@Override public boolean importData(TransferHandler.TransferSupport info) {
    if (!info.isDrop()) {
        return false;
    }

    JList list = (JList) info.getComponent();
    DefaultListModel listModel = (DefaultListModel) list.getModel();
    JList.DropLocation dl = (JList.DropLocation) info.getDropLocation();
    int index = dl.getIndex();
    boolean insert = dl.isInsert();

    // Get the string that is being dropped.
    Transferable t = info.getTransferable();
    String data;
    try {
        data = (String) t.getTransferData(DataFlavor.stringFlavor);
    } catch (Exception e) {
        return false;
    }

    // Perform the actual import.
    if (insert) {
        listModel.add(index, data);
    } else {
        listModel.set(index, data);
    }
    return true;
}