gridbaglayoutdemo.java

详细介绍了gridbglayout的使用

package layout;

/*
 * GridBagLayoutDemo.java requires no other files.
 */

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

public class GridBagLayoutDemo {
    final static boolean shouldFill = true;
    final static boolean shouldWeightX = true;
    final static boolean RIGHT_TO_LEFT = false;

    public static void addComponentsToPane(Container pane) {
        if (RIGHT_TO_LEFT) {
            pane.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        }

        JButton button;
	pane.setLayout(new GridBagLayout());
	GridBagConstraints c = new GridBagConstraints();
	if (shouldFill) {
	//natural height, maximum width
	c.fill = GridBagConstraints.HORIZONTAL;
	}

	button = new JButton("Button 1");
	if (shouldWeightX) {
	c.weightx = 0.5;
	}
	c.fill = GridBagConstraints.HORIZONTAL;
	c.gridx = 0;
	c.gridy = 0;
	pane.add(button, c);

	button = new JButton("Button 2");
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 0.5;
	c.gridx = 1;
	c.gridy = 0;
	pane.add(button, c);

	button = new JButton("Button 3");
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weightx = 0.5;
	c.gridx = 2;
	c.gridy = 0;
	pane.add(button, c);

	button = new JButton("Long-Named Button 4");
	c.fill = GridBagConstraints.HORIZONTAL;
	c.weighty = 0.0;
	c.ipady = 40;      //make this component tall,在Y方向上填充
	c.weightx = 0.0;
	c.gridwidth = 3;
	c.gridx = 0;
	c.gridy = 1;
	pane.add(button, c);

	button = new JButton("5");
	c.fill = GridBagConstraints.HORIZONTAL;
	c.ipady = 0;       //reset to default
	c.weighty = 1;   //request any extra vertical space
	c.anchor = GridBagConstraints.PAGE_END; //bottom of space
	c.insets = new Insets(10,0,0,0);  //top padding
	c.gridx = 1;       //aligned with button 2
	c.gridwidth = 2;   //2 columns wide
	c.gridy = 2;       //third row
	pane.add(button, c);
    }

    /**
     * Create the GUI and show it.  For thread safety,
     * this method should be invoked from the
     * event-dispatching thread.
     */
    private static void createAndShowGUI() {
        //Create and set up the window.
        JFrame frame = new JFrame("GridBagLayoutDemo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Set up the content pane.
        addComponentsToPane(frame.getContentPane());

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }
}