How to Fix Resizing Issues with Canvas in JScrollPane within JSplitPane?

Addressing the Resizing Issue with Canvas within JScrollPane within JSplitPane

In your application, you have encountered a resizing problem when adjusting the JSplitPane that contains a Canvas within a JScrollPane. Upon reducing the size of the top component, the divider appears to extend below the Canvas and the JScrollPane, resulting in an undesirable appearance.

Solution:

Rather than specifying preferred sizes manually, it is recommended to allow the components to calculate their own preferred sizes dynamically. By doing this, the enclosing window can be sized accordingly using the pack() method.

To demonstrate this approach, the following code sample can be used to create a SplitGraph, which consists of a GraphPanel placed in the top component and a corresponding control panel in the bottom component:

import draw.GraphPanel;
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.Image;
import java.net.URL;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;

public class SplitGraph extends JPanel {

    public SplitGraph() {
        super(new GridLayout());
        JSplitPane split = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
        GraphPanel graphPanel = new GraphPanel();
        Image image = new URL("https://placekitten.com/240/180").getContent();
        graphPanel.setImage(image);
        split.setTopComponent(new JScrollPane(graphPanel));
        split.setBottomComponent(graphPanel.getControlPanel());
        this.add(split);
    }

    private void display() {
        JFrame f = new JFrame("SplitGraph");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(this);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> new SplitGraph().display());
    }
}

In this example, the GraphPanel instance is added to the top component and its associated control panel is placed in the bottom component. The code successfully adjusts the size of the enclosing window to accommodate the components without any manual resizing.

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