动态更改嵌套的 Swing 组件

Question

Here is my problem: I have a JPanel that contains a JTabbedPane which has a JScrollPane using a customized JPanel . Quite simply, I change customized JPanel a ways into my program, and I need all of the parent components to reflect the change. However, I have no idea what I need to use in order to accomplish this. This is what I have now:

    infoScroller.remove(infoPanel);
    this.reevaluateInfoPanel();
    infoScroller.setViewportView(infoPanel);
    infoScroller.revalidate();
    infoScroller.repaint();

where infoScoller is the JScrollPane and infoPanel is the customized JPanel .

It should go from saying | Hi! | | Hi! | (or something like that, you get the idea) to saying | Bye! | | Bye! | but instead it goes from | Hi! | | Hi! | to | | | |

EDIT: By customized all I mean is that it extends JPanel, and has some components, etc. reevaluateInfoPane() sets the infoPanel equal to a new infoPanel based upon new information. I know that the reevalutateInfoPanel() does what I want, as I can put it is a new JFrame and it is correct... here is the code anyway... this will probably confuse more than help, as it is really not necessary...

private void reevaluateInfoPanel(){
    infoPanel = new JPanel();
    GridLayout gl = new GridLayout(infoNum, 1);
    infoPanel.setLayout(gl);

    //Create a display panel for every info block available
    DisplayPanel[] panels = new InfoViewer[infoList.length];
    for(int i = 0; i < panels.length; i++){
        panels[i] = new InfoViewer(infoList[i]);
    }

    //Assign a new SelectionPanel for every info selection necessary
    for(int i = 0; i < infoNum; i++){
        infoPanel.add(new SelectionPanel(panels, "info"));
    }
}

UPDATE: I have figured out that the problem lies somewhere with the JTabbedPane , which is not rendering the updated JScrollPane . Instead, it just removes it altogether when I revalidate and repaint it (the JTabbedPane ).

Answer 1

You should call revalidate() and repaint() on the container you changed. From the description, it sounds like you should call them on infoPanel . Also, make sure your calls happen on the Event Dispatch Thread.

Perhaps it would be helpful to also see how you change the content of infoPanel .

Answer 2

As already was suggested, calling revalidate() and repaint() on the parent component will be enough. It automatically propagates revalidation and repainting to all components inside that component.