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Editorial Team
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Asked: 2026-06-12T20:39:06+00:00

I have a GUI where the left side holds an image and the right

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I have a GUI where the left side holds an image and the right side is a panel which holds some label objects. I want it so that if there are more objects on the right panel than can fit, a scroll bar will appear.

The problem I have is that when a lot of objects are added to the right panel, the whole frame resizes.

Here are some screenshots. THe first one is the size I want the window to always be and the second image shows the resizing issue.

Correct size
Second image:
Incorrect size

Here is the code for the panel which holds the image panel and the side bar panel:

/**
 * image panel - displays image and editing area
 */
ImagePanel imagePanel = null;

// Holds the labels
private LabelHolder lHolder = new LabelHolder();

/**
 * handles New Object button action
 */
public void addNewPolygon() {
  imagePanel.addNewPolygon(null);
}

public ContainerPanel(String imageFilename, JFrame frame) {
  //setup main window panel 
  addComponents(imageFilename, frame);
}

public void addComponents(String imageFilename, JFrame frame) {
  setLayout(new FlowLayout());

  // Polygon Title
  JLabel labelPanelTitle = new JLabel("<html><b>Polygons</b></html>");
  labelPanelTitle.setBorder(new EmptyBorder(0, 0, 0, 150));
  Font f = new Font("LabelPanel", Font.PLAIN, 24);     
  labelPanelTitle.setFont(f);
  labelPanelTitle.setAlignmentX(CENTER_ALIGNMENT);

  // Create and set up the image panel.
  try {
    imagePanel = new ImagePanel(imageFilename, frame, this);
  } catch (Exception e1) {
    e1.printStackTrace();
  }
  imagePanel.setOpaque(true); //content panes must be opaque

  JPanel objectsPanel = new JPanel();
  objectsPanel.setLayout(new BoxLayout(objectsPanel, BoxLayout.Y_AXIS));

  JPanel labelHolderContainer = new JPanel();
  labelHolderContainer.setLayout(new BoxLayout(labelHolderContainer, BoxLayout.Y_AXIS));

  labelHolderContainer.add(lHolder);        

  JScrollPane scroller = new JScrollPane(labelHolderContainer); 

  // add the title
  objectsPanel.add(labelPanelTitle);
  // Add a spacer
  objectsPanel.add(Box.createRigidArea(new Dimension(0,25)));
  // Add all the labels
  objectsPanel.add(scroller);

  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
  addNewLabel("Some Object");
//      addNewLabel("Some Object");
//      addNewLabel("Some Object");
//      addNewLabel("Some Object");
//      addNewLabel("Some Object");

  add(imagePanel);
  add(Box.createRigidArea(new Dimension(10,0)));
  add(objectsPanel);

}   

public void addNewLabel(String labelName) {
  lHolder.add(new Label(labelName, imagePanel.getCurrentColour()));
  lHolder.add(Box.createRigidArea(new Dimension(10,10)));

  // set new colour 
  imagePanel.setCurrentColour(imagePanel.getRandomColour());
}
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1 Answer

  1. Editorial Team

    • have to override max size for parent of JScrollPane, or override JPanel (inside JScrollPane) helt whatever demonstrated on pictures, no idea for better help sooner post an SSCCE

    • in the case that you want to natural scrolling (no issue to put Icons with narrative) then to

    • use JList

    • use JTable with one Column

    EDIT

    remove JFrame#pack() from method(s) to add / modify / remove Items in JScrollPane, otherwise isn’t possible change size of Top-Level Containers on the Screen

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