JSplitPane with Top-component maximized on start: Java swing JSplitPane oneTouchExpandable

JSplitPane with Top-component maximized on start

Asked by: avl

I'd like a splitpane to initially come up such, as if the user had clicked the button (of the slider) to maximize the first component.

(If for some L&F these buttons do not exist, then either maximizing or showing both is ok. If the buttons exist, then maximizing must be done when the splitpane becomes first visible.)

Just setting the slider location to a large value is not a solution, because when user clicks the "unmaximize" button of the slider, it would then behave like maximizing the other component instantly, rather than show both.

jsp = new JSplitPane();
jsp.add(comp1); jsp.add(comp2);
// set various properties of jsp, like dividerLocation, where the divider
//   is supposed to jump back to, once the user unmaximizes comp1.
 
// now do magic, so only comp1 (and the slider) will be initially visible.

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I think this does what you want:

import java.awt.Dimension;
 
import javax.swing.*;
 
public class LayoutDemo extends JFrame {
	
    private JSplitPane splitPane;
    private JButton leftBtn;
    private JButton rightBtn;
    
    /** Creates new form LayoutDemo */
    public LayoutDemo() {
        initComponents();
        setSize(300,400);
        setLocationRelativeTo(null);
    }
    
    private void initComponents() {
        getContentPane().add(getSplitPane(), java.awt.BorderLayout.CENTER);
        pack();
    }
    
    public static void main(String args[]) {
        new LayoutDemo().setVisible(true);
    }
    
    private JSplitPane getSplitPane() {
    	if (splitPane==null) {
    		splitPane = new JSplitPane();
    		splitPane.setOneTouchExpandable(true);
    		splitPane.setResizeWeight(0.5);
    		splitPane.setLeftComponent(getLeftBtn());
    		splitPane.setRightComponent(getRightBtn());
    		splitPane.setDividerLocation(1000);
    	}
    	return splitPane;
    }
    
    private JButton getLeftBtn() {
    	if (leftBtn==null) {
    		leftBtn = new JButton("LEFT");
    		leftBtn.setMinimumSize(new Dimension(0,0));
    	}
    	return leftBtn;
    }
 
    private JButton getRightBtn() {
    	if (rightBtn==null) {
    		rightBtn = new JButton("RIGHT");
    		rightBtn.setMinimumSize(new Dimension(0,0));
    	}
    	return rightBtn;
    }
}

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JSplitPane with Top-component maximized on start

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Java swing JSplitPane oneTouchExpandable

Java AWT & Swing

UI Design

Java Standard Edition

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