Question

Help with Layout manager

Asked by: omahne

Ok.  I need to use the right layout manager so when the user resizes the container, all component sizes and positions are adjusted accordingly.  For example,  when the user uses the mouse to enlarge the container, the components should remain at the middle and in the same arrangement .  This is what I have:

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

public class NestingOne extends JFrame {

     private JPanel panel1, panel2, panel3;
     private Container container;
     private JButton buttons[];
     private JCheckBox snapgrid, showgrid;
     private GridBagLayout gbl1,gbl2, gbl3;
     private GridBagConstraints c;
     private JTextField field1, field2;
     private JLabel label1, label2;

     public NestingOne(){

          super("Nesting Panels");

          container = getContentPane();
          gbl1 = new GridBagLayout();
          c = new GridBagConstraints();
          c.anchor = GridBagConstraints.WEST;
          c.fill  =  GridBagConstraints.NONE;
          Insets i = new Insets(2,6,6,2);
          c.insets = i;

          c.gridx = 0;
          c.gridy = 0;
          c.weightx = 1.0;
          c.weighty = 1.0;
          c.gridwidth = 1;
          c.gridheight = 1;

          panel1 = new JPanel();
          panel1.setLayout(gbl1);
          snapgrid = new JCheckBox("Snap To Grid");
          gbl1.setConstraints(snapgrid, c);
          panel1.add(snapgrid);

          c.gridy = 1;
          showgrid = new JCheckBox("Show Grid");
          gbl1.setConstraints(showgrid, c);
          panel1.add(showgrid);

          container.add(panel1, BorderLayout.WEST);

//panel 2 layout and add for x and y
          gbl2 = new GridBagLayout();
          panel2 = new JPanel();
          panel2.setLayout(gbl2);

          c.gridy = 0;
          c.anchor = GridBagConstraints.EAST;

          label1 = new JLabel("X: ");
          label2 = new JLabel("Y: ");
          gbl2.setConstraints(label1, c);
          panel2.add(label1);

          c.gridy = 1;
          gbl2.setConstraints(label2, c);
          panel2.add(label2);

          c.gridy = 0;
          c.gridx = 1;
          c.anchor = GridBagConstraints.WEST;

          field1 = new JTextField("8",5);
          gbl2.setConstraints(field1, c);
          panel2.add(field1);

          c.gridy = 1;
          field2 = new JTextField("8",5);
          gbl2.setConstraints(field2, c);
          panel2.add(field2);

          container.add(panel2, BorderLayout.CENTER);

//Panel 3 layout and add for OK, Help, Cancel

       c.anchor = GridBagConstraints.CENTER;
       c.gridx = 0;
       c.gridy = 0;
       c.fill  =  GridBagConstraints.BOTH;

       gbl3 = new GridBagLayout();
       buttons = new JButton[3];
       panel3 = new JPanel();
       panel3.setLayout(gbl3);
       buttons[0] = new JButton("OK");
       gbl3.setConstraints(buttons[0], c);
       panel3.add(buttons[0]);
       buttons[1] = new JButton("Cancel");
       c.gridy = 1;
       gbl3.setConstraints(buttons[1], c);
       panel3.add(buttons[1]);
       buttons[2] = new JButton("Help");
       c.gridy = 2;
       gbl3.setConstraints(buttons[2], c);
       panel3.add(buttons[2]);

       container.add(panel3, BorderLayout.EAST);

       setSize(425,150);
       setVisible(true);
   }
   public static void main(String args[])
   {
       NestingOne application = new NestingOne();

       application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   }
}

Thanks so very much.

 

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Asked On
2007-05-22 at 18:09:13ID22588906
Tags

help

,

layout

Topics

Java Programming Language

,

New to Java Programming

Participating Experts
2
Points
500
Comments
3

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Answers

 

by: JavatmPosted on 2007-05-22 at 20:28:09ID: 19139191

Is this good enough?

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

public class NestingOne extends JFrame {

      private JPanel panel1, panel2, panel3;
      private JPanel container;
      private JButton buttons[];
      private JCheckBox snapgrid, showgrid;
      private GridBagLayout gbl1,gbl2, gbl3;
      private GridBagConstraints c;
      private JTextField field1, field2;
      private JLabel label1, label2;

      public NestingOne(){

            super("Nesting Panels");

            container = new JPanel();
            gbl1 = new GridBagLayout();
            c = new GridBagConstraints();
            c.anchor = GridBagConstraints.WEST;
            c.fill  =  GridBagConstraints.NONE;
            Insets i = new Insets(2,6,6,2);
            c.insets = i;

            c.gridx = 0;
            c.gridy = 0;
            c.weightx = 1.0;
            c.weighty = 1.0;
            c.gridwidth = 1;
            c.gridheight = 1;

            panel1 = new JPanel();
            panel1.setLayout(gbl1);
            snapgrid = new JCheckBox("Snap To Grid");
            gbl1.setConstraints(snapgrid, c);
            panel1.add(snapgrid);

            c.gridy = 1;
            showgrid = new JCheckBox("Show Grid");
            gbl1.setConstraints(showgrid, c);
            panel1.add(showgrid);

            container.add(panel1, BorderLayout.WEST);

//            panel 2 layout and add for x and y
            gbl2 = new GridBagLayout();
            panel2 = new JPanel();
            panel2.setLayout(gbl2);

            c.gridy = 0;
            c.anchor = GridBagConstraints.EAST;

            label1 = new JLabel("X: ");
            label2 = new JLabel("Y: ");
            gbl2.setConstraints(label1, c);
            panel2.add(label1);

            c.gridy = 1;
            gbl2.setConstraints(label2, c);
            panel2.add(label2);

            c.gridy = 0;
            c.gridx = 1;
            c.anchor = GridBagConstraints.WEST;

            field1 = new JTextField("8",5);
            gbl2.setConstraints(field1, c);
            panel2.add(field1);

            c.gridy = 1;
            field2 = new JTextField("8",5);
            gbl2.setConstraints(field2, c);
            panel2.add(field2);

            container.add(panel2, BorderLayout.CENTER);

//            Panel 3 layout and add for OK, Help, Cancel
            c.anchor = GridBagConstraints.CENTER;
            c.gridx = 0;
            c.gridy = 0;
            c.fill  =  GridBagConstraints.BOTH;

            gbl3 = new GridBagLayout();
            buttons = new JButton[3];
            panel3 = new JPanel();
            panel3.setLayout(gbl3);
            buttons[0] = new JButton("OK");
            gbl3.setConstraints(buttons[0], c);
            panel3.add(buttons[0]);
            buttons[1] = new JButton("Cancel");
            c.gridy = 1;
            gbl3.setConstraints(buttons[1], c);
            panel3.add(buttons[1]);
            buttons[2] = new JButton("Help");
            c.gridy = 2;
            gbl3.setConstraints(buttons[2], c);
            panel3.add(buttons[2]);

            container.add(panel3, BorderLayout.EAST);
            this.getContentPane().add(container, BorderLayout.CENTER);

            setSize(425,150);
            setVisible(true);
      }
      public static void main(String args[])
      {
            NestingOne application = new NestingOne();
            application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      }
}

 

by: keyurkarnikPosted on 2007-05-23 at 03:50:26ID: 19140523

In your code, your Container is the Content Pane itself

What you should do is create another JPanel as the Container

container = new JPanel();

then at the end you should add :

getConentPane.add(container);
getContentPane().addComponentListener(this);

before setSize and setVisible

Also your NestingOne calss should implement ComponentListener and implement the
public void componentResized(ComponentEvent e)
   {
     
   }

By default, the inner pane (container) will be horizonally centred)
To have it vertically centred, you need to take the dimensions from the event e, and reset it as required.

 

by: omahnePosted on 2007-05-23 at 17:30:01ID: 19146023

Thanks

20120131-EE-VQP-002

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