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2012/04/26

aterai

Select multiple items in a JList by clicking and dragging

Code

JList list = new JList(model) {
  private ClearSelectionListener listener;
  @Override public void setSelectionInterval(int anchor, int lead) {
    if(anchor==lead && lead >= 0 && anchor >= 0) {
      if(listener.isDragging) {
        addSelectionInterval(anchor, anchor);
      }else if(!listener.isInCellDragging) {
        if(isSelectedIndex(anchor)) {
          removeSelectionInterval(anchor, anchor);
        }else{
          addSelectionInterval(anchor, anchor);
        }
        listener.isInCellDragging = true;
      }
    }else{
      super.setSelectionInterval(anchor, lead);
    }
  }
};

References