Ronaldo7 Ronaldo7 - 5 months ago 16
Java Question

How can I create two dimensional SplitPane in Java Swing

I want to create a two dimensional

JSplitpane
like design in Java swing.
Such that the
JFrame
will be split into 4 parts, and upper and lower parts are separated by another split, and left and right part are separated by yet another split line. Also if I click and drag any part of vertical split line, the complete line should move in dragged direction.

ScreenShot

I am trying to achieve this, by using split pane within split pane. But then on dragging vertical split line, it only drags either components below horizontal line or above horizontal split line.

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Demo extends JFrame {

int screenwidth=760,screenheigth=550;

JSplitPane top_sp,bottom_sp,main_sp;

JButton b1,b2,b3,b4,b5,b6;
JButton b7,b8,b9,b10;

MailClient(){
setSize(screenwidth,screenheigth);
setLayout(new BorderLayout());
setTitle("Demo");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);

b1=new JButton("B1");
b2=new JButton("B2");
b3=new JButton("B3");
b4=new JButton("B4");
b5=new JButton("B5");
b6=new JButton("B6");
b7=new JButton("B7");
b8=new JButton("B8");
b9=new JButton("B9");
b10=new JButton("B10");

JPanel topleft=new JPanel(new FlowLayout());
topleft.add(b1);
topleft.add(b2);

JPanel topright=new JPanel(new FlowLayout(FlowLayout.CENTER));
topright.add(b3);
topright.add(b4);
topright.add(b5);
topright.add(b6);

JPanel bottomleft=new JPanel(new FlowLayout(FlowLayout.CENTER));

bottomleft.add(b7);
bottomleft.add(b8);
bottomleft.add(b9);
bottomleft.add(b10);

JPanel bottomright=new JPanel(new FlowLayout(FlowLayout.CENTER));
bottomright.add(new JLabel("TABLE"));

top_sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,topleft,topright);
bottom_sp=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,bottomleft,bottomright);

main_sp=new JSplitPane(JSplitPane.VERTICAL_SPLIT,true,top_sp,bottom_sp);

add(main_sp,"Center");

setVisible(true);
}

public static void main(String args[]){
Demo demo=new Demo();

}

}

Answer

You can use a property change listener to detect when the split pane divider has been moved, and then set the location of the other split pane:

import javax.swing.*;
import java.awt.*;

public class Example extends JFrame {

    public Example() {

        JPanel topLeftPanel = new JPanel();
        JPanel topRightPanel = new JPanel();
        JPanel bottomLeftPanel = new JPanel();
        JPanel bottomRightPanel = new JPanel();

        JSplitPane topPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, topLeftPanel, topRightPanel);

        JSplitPane bottomPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, bottomLeftPanel, bottomRightPanel);

        topPane.addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, pce -> {
            bottomPane.setDividerLocation((int) pce.getNewValue());
        });

        bottomPane.addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, pce -> {
            topPane.setDividerLocation((int) pce.getNewValue());
        });

        JSplitPane mainPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, topPane, bottomPane);

        setContentPane(mainPane);
        setLocationRelativeTo(null);
        setMinimumSize(new Dimension(400, 400));
        setVisible(true);
    }

    public static void main(String[] args) {
        new Example();
    }
}
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