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Thread: Help with GridBagLayout

  1. #1
    Junior Member
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    Feb 2012
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    Default Help with GridBagLayout

    This is my first attempt at using the GridBagLayout. Here is a screen shot of the program I made with C# that I am trying to remake in Java:

    Here is my code:
    package ISAPI;
    import java.awt.BorderLayout;
    import java.awt.Container;
    import java.awt.Dimension;
    import java.awt.GridBagConstraints;
    import java.awt.GridBagLayout;
    import java.awt.GridLayout;
    import javax.swing.JButton;
    import javax.swing.JComboBox;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JTextArea;
    import javax.swing.JTextField;
    public class MainFrame extends JFrame 
    	final int WIDTH = 850;
    	final int HEIGHT = 600;
    	private String[] ComboArry ={" ", "IAgentManagement", "IContactManagment", "ISessionManagement"};
    	public MainFrame(String title)
    		Dimension size = getPreferredSize();
    		size.width = WIDTH;
    		size.height = HEIGHT;
    		JLabel hostLabel = new JLabel("IS Host");
    		JLabel generatedLabel = new JLabel("Generated URL to Post to integration Services");
    		JLabel responseHtmlLabel = new JLabel("Response from the API in HTML");
    		JLabel responseTextLabel = new JLabel("Response from the API in Text");
    		JLabel interfaceLabel = new JLabel("Interface");
    		JTextField hostTextField = new JTextField(22);
    		JTextArea generatedTextArea = new JTextArea(3, 20);
    		JTextArea responseHTMLTextArea = new JTextArea(10, 10);
    		JTextArea responseTextTextArea = new JTextArea(10, 4);
    		JButton createURLButton = new JButton("Create URL");
    		JButton postButton = new JButton("Post");
    		JComboBox interfaceBox = new JComboBox(ComboArry);
    		interfaceBox.setPreferredSize(new Dimension(250,20));
    		ActivityPanel Ap = new ActivityPanel();
    		Container pane = getContentPane();
    		pane.setLayout(new GridBagLayout());
    		GridBagConstraints gc = new GridBagConstraints();
    		//first row
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 0.2;
    		gc.weighty = 1;
    		gc.gridx = 0;
    		gc.gridy = 0;
    		add(hostLabel, gc);
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 0.5;
    		gc.gridx = 1;
    		gc.gridy = 0;
    		add(hostTextField, gc);
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 2;
    		gc.gridx = 2;
    		gc.gridy = 0;
    		add(generatedLabel, gc);
    		//second row
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 0.5;
    		gc.weighty = 1;
    		gc.gridx = 0;
    		gc.gridy = 1;
    		add(interfaceLabel, gc);
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 0.5;
    		gc.gridx = 1;
    		gc.gridy = 1;
    		add(interfaceBox, gc);
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 0.5;
    		gc.weighty = 10;
    		gc.gridx = 2;
    		gc.gridy = 1;
    		add(generatedTextArea, gc);
    		//third row
    		gc.fill = GridBagConstraints.HORIZONTAL;
    		gc.weightx = 0.5;
    		gc.weighty = 10;
    		gc.gridx =0;
    		gc.gridy = 2;
    		add(Ap, gc);

    Here is a screen shot of what I have so far:

    The ActivityPanel has a set width and height of 250 x 450 with a red background(which I did just to see what was going on).

    I tried using the GridBagConstraint Constants to no avail.

    is there a way to set a margin or padding in between cells?

    basically I am lost, I have to use the gridbaglayout, I went through the demo at docs.oracle.com, if someone could point me in the right direction I would appreciate it.

    Thanks in advance!

  2. #2
    Member snowguy13's Avatar
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    Default Re: Help with GridBagLayout

    What I've noticed is that GridBagLayout seems to care nothing about the sizes you set for your Components. Instead, you have to be tricky with your organization.

    GridBagConstraints also has these variables:

    gridwidth and gridheight (which allow a Component to span more than 1 cell by 1 cell; for example, gridheight = 2 would make a Component span two cells vertically in the GridBagLayout)
    ipadx and ipady (internal padding, which makes a component larger or smaller).
    anchor (controls where a Component will be aligned in its grid area)

    I think you should try messing with ipadx and ipady. You could use them to make your JTextAreas fill large areas of the JFrame. Also note that you can set

    <GridBagConstraints>.fill = GridBagConstraints.BOTH;

    This will make a Component fill its area both horizontally and vertically.

    anchor and gridwidth/gridheight could be beneficial to you, too.

    Here's a quick tip: if you want to create a space between all of your Components and the edge of a JFrame, use an EmptyBorder.
    Last edited by snowguy13; February 20th, 2012 at 07:55 AM.
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