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Thread: Need help understanding GUI screen layouts and labels

  1. #1
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    Default Need help understanding GUI screen layouts and labels

    Ok, I have to make a program which converts binary to decimal and decimal to binary, making my own calculations for it. That part is no problem, but right now I'm trying to construct the basic layout of what the screen should look like, but I'm having problems with it.

    The general idea of what I want is:

    --------------------------------------------------------------
    |                                            ___________              
    |                  Binary number: |  (text field)  |             
    |                                                                                
    |                               Decimal number:                       
    |            _______________________________      
    |           |                      (text field)                      |      
    |                                                                                 
    |  [Button 1]    [Button 2]    [Button 3]    [Button 4] 
    |                                                                                 
    ---------------------------------------------------------------

    Now, with my current code, which I will show soon, this is basically what I am getting:


    --------------------------------------------------------------
    |       [Button 1]    [Button 2]    [Button 3]    [Button 4] 
    |                                                                                
    |   Binary number:                                                     
    |                                                                                
    |   Decimal number:                                                   
    |            _______________________________      
    |           |                      (text field)                      |      
    |                                                                                 
    |            _______________________________      
    |           |                      (text field)                      |      
    ---------------------------------------------------------------

    I've tried messing with some things, but I only end up really messing it up. Here is my code:

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    import javax.swing.JLabel;
    import java.awt.Color;
    import java.awt.Container;
    import java.awt.BorderLayout;
    import java.awt.FlowLayout;
    import java.awt.GridLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    public class BinaryDecimalConverter extends JFrame implements ActionListener
    {
        public static final int WIDTH = 400;
        public static final int HEIGHT = 300;
     
     
        private JTextField binaryText;
        private JTextField decimalText;
     
        private String decimal = "No Binary to Convert";
        private String binary = "No Decimal to Convert";
     
        public BinaryDecimalConverter( )
        {
    		setSize(WIDTH, HEIGHT);
            addWindowListener(new WindowDestroyer( ));
            setTitle("Binary/Decimal Number Converter");
            Container contentPane = getContentPane( );
            contentPane.setLayout(new BorderLayout( ));
     
            JPanel buttonPanel = new JPanel( );
     
            buttonPanel.setLayout(new FlowLayout( ));
     
            JButton toDecButton = new JButton("To Base 10");
            toDecButton.addActionListener(this);
            buttonPanel.add(toDecButton);
     
            JButton toBinButton = new JButton("To Base 2");
            toBinButton.addActionListener(this);
            buttonPanel.add(toBinButton);
     
            JButton clearButton = new JButton("Clear");
            clearButton.addActionListener(this);
            buttonPanel.add(clearButton);
     
            JButton exitButton = new JButton("Exit");
            exitButton.addActionListener(this);
            buttonPanel.add(exitButton);
     
            contentPane.add(buttonPanel, BorderLayout.SOUTH);
     
            JPanel textPanel = new JPanel( );
     
    		contentPane.setLayout(new GridLayout(6, 1));
     
    		JLabel binLabel = new JLabel("Binary number:");
            contentPane.add(binLabel);
     
            binaryText = new JTextField(20);
            binaryText.setBackground(Color.WHITE);
            textPanel.add(binaryText);
            contentPane.add(textPanel);
     
    		JLabel decLabel = new JLabel("Decimal number:");
            contentPane.add(decLabel);
     
    		decimalText = new JTextField(20);
    		decimalText.setBackground(Color.WHITE);
    		textPanel.add(decimalText);
            contentPane.add(textPanel);
     
        }
     
        public void actionPerformed(ActionEvent e)
        {
            String actionCommand = e.getActionCommand( );
            if (actionCommand.equals("To Base 10"))
                decimal = binaryText.getText( );
            else if (actionCommand.equals("To Base 2"))
                binary = decimalText.getText( );
            else if (actionCommand.equals("Clear")) {
                binaryText.setText("");
                decimalText.setText("");
    		}
            else if (actionCommand.equals("Exit"))
                System.exit(0);
            else
                binaryText.setText("Error in conversion");
         }
     
        public static void main(String[] args)
        {
            BinaryDecimalConverter guiMemo = new BinaryDecimalConverter( );
            guiMemo.setVisible(true);
        }
    }

    If anyone can give me a better idea of how to manipulate and use a layout and arrange objects the way I want, it would be much appreciated.

    Thanks!


  2. #2
    Java kindergarten chronoz13's Avatar
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    Default Re: Need help understanding GUI screen layouts and labels

    Last edited by chronoz13; December 2nd, 2009 at 02:56 AM.

  3. The Following User Says Thank You to chronoz13 For This Useful Post:

    Bill_H (December 2nd, 2009)

  4. #3
    Super Moderator copeg's Avatar
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    Default Re: Need help understanding GUI screen layouts and labels

    The problems you see have to do with you change in layout in the contentPane and order of addition to the contentPane. A layout you may wish to consider is the BoxLayout (I personally always tend to lean toward BoxLayout because it is both easy and versatile when used in combinations): create a JPanel that has a page axis box layout, then add the components to this layout
    Here's a quick revision, you can of course alter the prettiness of the layout bay adding borders and/or chaning the layouts of the other panels.

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JTextField;
    import javax.swing.JLabel;
    import javax.swing.BoxLayout;
    import java.awt.Color;
    import java.awt.Container;
    import java.awt.BorderLayout;
    import java.awt.FlowLayout;
    import java.awt.GridLayout;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
     
    public class Test extends JFrame implements ActionListener
    {
        public static final int WIDTH = 400;
        public static final int HEIGHT = 300;
     
     
        private JTextField binaryText;
        private JTextField decimalText;
     
        private String decimal = "No Binary to Convert";
        private String binary = "No Decimal to Convert";
     
        public Test( )
        {
    		setSize(WIDTH, HEIGHT);
     
    		JPanel main = new JPanel(  );
    		main.setLayout( new BoxLayout(main, BoxLayout.PAGE_AXIS ));
            //addWindowListener(new WindowDestroyer( ));
            setTitle("Binary/Decimal Number Converter");
            Container contentPane = getContentPane( );
     
     
           // contentPane.setLayout(new BorderLayout( ));
     
            JPanel buttonPanel = new JPanel( );
     
            buttonPanel.setLayout(new FlowLayout( ));
     
            JButton toDecButton = new JButton("To Base 10");
            toDecButton.addActionListener(this);
            buttonPanel.add(toDecButton);
     
            JButton toBinButton = new JButton("To Base 2");
            toBinButton.addActionListener(this);
            buttonPanel.add(toBinButton);
     
            JButton clearButton = new JButton("Clear");
            clearButton.addActionListener(this);
            buttonPanel.add(clearButton);
     
            JButton exitButton = new JButton("Exit");
            exitButton.addActionListener(this);
            buttonPanel.add(exitButton);
     
           // contentPane.add(buttonPanel, BorderLayout.SOUTH);
     
            JPanel textPanel = new JPanel( );
     
    		//contentPane.setLayout(new GridLayout(6, 1));
     
    		JLabel binLabel = new JLabel("Binary number:");
            //contentPane.add(binLabel);
     
            binaryText = new JTextField(20);
            binaryText.setBackground(Color.WHITE);
    		textPanel.add(binLabel);
            textPanel.add(binaryText);
            //contentPane.add(textPanel);
     
    		JLabel decLabel = new JLabel("Decimal number:");
            //contentPane.add(decLabel);
     
    		decimalText = new JTextField(20);
    		decimalText.setBackground(Color.WHITE);
    		//textPanel.add(decimalText);
     
    		main.add( textPanel );
    		main.add( decLabel );
    		main.add( decimalText );
    		main.add( buttonPanel );
    		getContentPane().add(main);
    		pack();
            //contentPane.add(textPanel);
     
        }
     
        public void actionPerformed(ActionEvent e)
        {
            String actionCommand = e.getActionCommand( );
            if (actionCommand.equals("To Base 10"))
                decimal = binaryText.getText( );
            else if (actionCommand.equals("To Base 2"))
                binary = decimalText.getText( );
            else if (actionCommand.equals("Clear")) {
                binaryText.setText("");
                decimalText.setText("");
    		}
            else if (actionCommand.equals("Exit"))
                System.exit(0);
            else
                binaryText.setText("Error in conversion");
         }
     
        public static void main(String[] args)
        {
            Test guiMemo = new Test( );
            guiMemo.setVisible(true);
        }
    }

  5. The Following User Says Thank You to copeg For This Useful Post:

    Bill_H (December 2nd, 2009)

  6. #4
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    Default Re: Need help understanding GUI screen layouts and labels

    Thanks for the help you two! I have the outlay I'm looking for, now I have another problem I've run into: my buttons don't appear to be working correctly.

    I've started writing my method to convert to decimal, but the setText method doesn't do anything to change what is shown in the textfield. Even if I do something like:

    binaryText.setText("random text");

    It doesn't change the status of the box at all. I also noticed that while my Clear button appears to work with:

    binaryText.setText("");
    decimalText.setText("");

    If I change the parameter to:

    binaryText.setText("Do something");

    It still clears the text box, but does not replace it with "Do something"

    Any ideas?



    EDIT: After some alterations, I have managed to fully complete the program. Thanks for the help!
    Last edited by Bill_H; December 3rd, 2009 at 01:06 AM.

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