Jave Swing Eclipse-JPanel和组件自动调整大小

Question

I am maintaining a system which requires me to make components in the dialog resizable, the dialog box calls out a java class Panel.

What is supposed to happen:

What is currently happening:

Note: The image on the bottom layer represents the resized one. While the image at the top layer is the dialog box which is not yet resized.

As you can see, the component JPanel(the one with the black border) is not resized. I am trying to achieve what happend to the bottom layer image of the first attachment.

I tried to apply the answer in How to dynamically control auto-resize components in Java Swing and pattern it in current code but since my panel is only called in a dialog box so there are limitations. The problem is that the components and its hierarchy have been already implemented, I just have to make it auto-resize.

Here is my current outline:

Answer 1

If you want a simple solution you can use a layout manager as described here . Or, if you wish to avoid a layout manager(like me) then you can have your program resize your elements every time there is a resize event. Here is some sudo-code

frameOrPanel.addComponentListener(new ComponentAdapter() {
   public void componentResized(ComponentEvent componentEvent) {
    element.setLocation(frameOrPanel.getWidth()*1/4, frameOrPanel.getHeight*1/4);
    element.setSize(frameOrPanel.getWidth()*1/2, frameOrPanel.getHeight()*1/2);
   }
});

You will have to add unimplemented methods.

Note: the 1/4 and 1/2 is merely a ratio you can change those to fit your application.