how do i divide JPanel in 70% 30%

Question

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Swing: How do I set a component height to the container's height?

how do i divide JPanel like the picture shown below there are 2 panels panel1 and panel2 panel1 should take 70% and panel2 30% or panel1 should be bigger than panel2... I have tried Gridlayout, Border Layout but its not working.any help would be appreciated.

public class TestApplication extends JApplet {

private static final long serialVersionUID = 1L;

    JPanel p1,p2;

    public void init(){         
        setLayout(new GridLayout(3,1));
        p1=new JPanel();
        p2=new JPanel();

        p1.setBackground(Color.RED);
        p2.setBackground(Color.GREEN);

        add(p1);
        add(p2);
    }   
}

enter image description here

image uploaded was created in paint :) – madhur Sep 05 '12 at 07:18 — madhur, Sep 05 '12 at 07:18
Use GridBagLayout and use weighty=0.7 and 0.3 respectively – prajeesh kumar Sep 05 '12 at 07:22 — prajeesh kumar, Sep 05 '12 at 07:22

score 13 · Accepted Answer · edited Mar 29 '14 at 04:53

Have you considered using a JSplitPane (How to Use Split Panes)?

import java.awt.BorderLayout;
import java.awt.Color;

import javax.swing.JApplet;
import javax.swing.JPanel;
import javax.swing.JSplitPane;

public class TestApplication extends JApplet {

private static final long serialVersionUID = 1L;

    JPanel p1,p2;

    @Override
    public void init(){         
        setLayout(new BorderLayout());

        p1=new JPanel();
        p2=new JPanel();

        p1.setBackground(Color.RED);
        p2.setBackground(Color.GREEN);
        JSplitPane sp = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
        sp.setResizeWeight(0.7);
        sp.setEnabled(false);
        sp.setDividerSize(0);

        sp.add(p1);
        sp.add(p2);
        add(sp, BorderLayout.CENTER);
    }   
}

enter image description here

score 1 · Answer 2 · answered Sep 05 '12 at 07:32

1

If you have an external JFrame (or another JPanel) f, you can apply a BorderLayout and put p1 in NORTH and p2 in SOUTH. Then, using

Dimension df = f.getSize();

You will get the Dimension of the external Container (f). Next, call to:

void setSize(Dimension d)

this way:

p1.setSize(new Dimension(df.getWidth(), df.getHeight()*0.7));
p2.setSize(new Dimension(df.getWidth(), df.getHeight()*0.3));

Finally, add these JPanels to its container.

answered Sep 05 '12 at 07:32

arutaku

5,937
1
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38

If you use a LayoutManager, you should never call setSize. Either use LayoutManager's, constraints and as a last resort you can force pref/min/max size, or use absolute layout (`null`-layout) and you invoke setBounds/setLocation/setSize yourself. Mixing both in the same container is only looking for troubles. – Guillaume Polet Sep 05 '12 at 09:44

how do i divide JPanel in 70% 30%

2 Answers2