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Thread: GridBagLayout can't seem to get it right.

  1. #1
    Junior Member
    Join Date
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    Default GridBagLayout can't seem to get it right.

    Hello. I am trying to get some practice with Java GUI and using GridBagLayout.

    I am trying to create a simple calculator applicatoin, and I am having problems getting the buttons just right. So in the code below, I've only made visible a handful of the buttons, but it illustrates the problem that I am having.

    I want my calculator to look like the following:

    textfield
    1 2 3 +

    where the buttons 1, 2, and 3 are of width 3, + is width 1, and textfield spans the entire width of the application.

    The current code, when it displays, shows that buttons 1,2,3,+ all have the same wdith, yet I didn't specify that in the grid. Can someone find the problem in my code?

    Maybe more importantly, should I be using GridBagLayout to do what I want? Or should I just take complete control of the layout?

    thanks.

    And now the code....


    /* Calculator.java
    */


    import java.awt.Container;
    import java.awt.Component;
    import java.awt.event.ActionListener;
    import java.awt.Insets;
    import java.awt.GridBagLayout;
    import java.awt.GridBagConstraints;

    import javax.swing.JFrame;
    import javax.swing.JTextField;
    import javax.swing.JButton;
    import javax.swing.JPanel;
    import javax.swing.BoxLayout;
    import java.awt.BorderLayout;

    class Calculator {
    JFrame frame;
    JTextField textfield;
    JButton bt1, bt2, bt3, bt4, bt5, bt6, bt7, bt8, bt9, bt0;
    JButton btDecimal, btEquals;
    JButton btPlus, btMinus, btMultiply, btDivide;
    final static Insets insets = new Insets(0,0,0,0);

    public Calculator() {
    frame = new JFrame( "Calculator");
    frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
    frame.setLayout( new GridBagLayout());

    textfield = new JTextField(15);
    bt1 = new JButton("1");
    bt2 = new JButton("2");
    bt3 = new JButton("3");
    bt4 = new JButton("4");
    bt5 = new JButton("5");
    bt6 = new JButton("6");
    bt7 = new JButton("7");
    bt8 = new JButton("8");
    bt9 = new JButton("9");
    bt0 = new JButton("0");

    btDecimal = new JButton( ".");
    btEquals = new JButton( "=");

    btPlus = new JButton( "+");
    btMinus = new JButton( "-");
    btMultiply = new JButton( "*");
    btDivide = new JButton( "/");

    addComponent( frame, textfield, 0,0, 10, 1);

    addComponent( frame, bt1 , 0,1, 3, 1);
    addComponent( frame, bt2 , 3,1, 3, 1);
    addComponent( frame, bt3 , 6,1, 3, 1);
    addComponent( frame, btPlus , 9,1, 1, 1);

    frame.pack();
    //frame.setSize(300,300);
    frame.setVisible(true);
    }

    public void addComponent( Container container, Component component,
    int gridx, int gridy, int widthx, int widthy)
    {
    GridBagConstraints gbc;
    gbc = new GridBagConstraints
    ( gridx, gridy, widthx, widthy, 1.0, 1.0,
    GridBagConstraints.CENTER,
    GridBagConstraints.BOTH,
    insets, 0, 0);

    container.add( component, gbc);
    return;
    }
    }


    public class CalculatorEngine{
    public static void main( String[] args) {
    Calculator gui = new Calculator();
    CalculatorEngine eng = new CalculatorEngine();

    return;
    }
    }


  2. #2
    Junior Member
    Join Date
    Aug 2011
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    Default Re: GridBagLayout can't seem to get it right.

    Sorry about that very first post. Again I am trying to make a calculator and I want the numbers to be fatter buttons than the operators like '+'. However, the GridBagLayout Manager always seems to want to resize the buttons to be the same size.

    So below is much shortened version of the problem code. Notice that when I addComponent(), I specify that the size of the number pads should be 3 times the width of the plus button. But when you run this code, you'll see that the buttons arre all the same width.

    Any suggestions? Thanks.





    /* CalculatorEngine.java
     */
     
     
    import java.awt.Container;
    import java.awt.Component;
    import java.awt.event.ActionListener;
    import java.awt.Insets;
    import java.awt.GridBagLayout;
    import java.awt.GridBagConstraints;
     
    import javax.swing.JFrame;
    import javax.swing.JTextField;
    import javax.swing.JButton;
    import javax.swing.JPanel;
    import javax.swing.BoxLayout;
    import java.awt.BorderLayout;
     
    class Calculator {
        JFrame frame;
        JTextField textfield;
        JButton bt1, bt2, bt3;
        JButton btPlus;
     
        final static Insets insets = new Insets(0,0,0,0);
     
        public Calculator() {
    	frame = new JFrame( "Calculator");
    	frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
    	frame.setLayout( new GridBagLayout());
     
    	textfield = new JTextField(15);
    	bt1 = new JButton("1");
    	bt2 = new JButton("2");
    	bt3 = new JButton("3");
    	btPlus = new JButton( "+");
     
    	addComponent( frame, textfield, 0,0, 10, 1);
     
    	addComponent( frame, bt1      , 0,1, 3,  1);
    	addComponent( frame, bt2      , 3,1, 3,  1);
    	addComponent( frame, bt3      , 6,1, 3,  1);
    	addComponent( frame, btPlus   , 9,1, 1,  1);
     
    	frame.pack();
    	//frame.setSize(300,300);
    	frame.setVisible(true);
        }
     
        public void addComponent( Container container, Component component, 
    			      int gridx, int gridy, int widthx, int widthy)
        {
    	GridBagConstraints gbc;
    	gbc = new GridBagConstraints
    	    ( gridx, gridy, widthx, widthy, 1.0, 1.0,
    	      GridBagConstraints.CENTER,
    	      GridBagConstraints.BOTH,
    	      insets, 0, 0);
     
    	container.add( component, gbc);
    	return;
        }
    }
     
     
    public class CalculatorEngine{
        public static void main( String[] args) {
    	Calculator gui = new Calculator();
    	CalculatorEngine eng = new CalculatorEngine();
     
    	return;
        }
    }

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