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7.4

button action listener

Asked by allelopath in Java AWT & Swing, Java Programming Language

Tags: swing java

I making my own JDialog class, because I want the buttons a certain way.
I've got something that works, but it seems inelegant.
Two classes here: ThreeButtonDialog and ButtonPanel (ignore TextPanel, not relevant)

My concern is that in ButtonPanel, I have this:
            buttonMiddle = new JButton (options[1]);
            buttonMiddle.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
      System.out.println ("Action [" + ae.getActionCommand() + "] performed");
      ThreeButtonDialog.performCenterButtonAction();
}

});

What seems ugly is that has to call a static function in ThreeButtonDialog.
Is there a better way to do this?

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             package threeButtonDialog;
 
import javax.swing.*;
import java.awt.*;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
 
/**
 * Dialog with lots of space between the left and middle/right buttons
 * 
 */
public class ThreeButtonDialog extends JDialog {
 
	/**
	 * constructor
	 * 
	 * @param parent JFrame parent
	 * @param title title of dialog box
	 */
	public ThreeButtonDialog(JFrame parent, String title) {
		
		super(parent, title, true); // true = modal;
 
	}
	
 
	/**
	 *  
	 * @param message message to display
	 * @param options array of 3 Strings for button labels
	 * @param icon icon to display
	 */
	public void showDialog (String message,
			                             String[] options,
			                             Image icon) {
 
		// must have 3 button labels
		if (options.length != 3) {
			System.out.println ("ThreeButtonDialog: incorrect number of button labels");
		}
		else { // no input errors, so carry on
			
			this.setLayout (new BorderLayout());
			
			// build message panel
			TextPanel textPanel = new TextPanel(message);
			this.add (textPanel, BorderLayout.CENTER);
			
			ButtonPanel buttonPanel = new ButtonPanel(options);
			this.add(buttonPanel, BorderLayout.PAGE_END);
			
			pack();
			setVisible(true);
		 
		}
	}
 
	public static void performLeftButtonAction () {
		System.out.println ("leftButton");
	}
	
 
	public static void performCenterButtonAction () {
		System.out.println ("centerButton");
	}
 
	public static void performRightButtonAction () {
		System.out.println ("rightButton");
	}
}
---------------------------------------------------
 
package threeButtonDialog;
import java.awt.GridLayout;
import java.awt.Insets;
 
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.event.AncestorEvent;
import javax.swing.event.AncestorListener;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
public class ButtonPanel extends JPanel implements ActionListener {
	
    private final Insets insets =  new Insets(10,10,10,10);
		    
	private JButton buttonLeft; // button on left side
	private JButton buttonMiddle; // button between left and right button
	private JButton buttonRight; // button on right side
			
	/**
	 * constructor
	 * 
	 * @param options
	 */
    public ButtonPanel(String[] options) {
		    	
    	// 1 row,
    	// 5 columns (button, empty, empty, button, button)
    	setLayout (new GridLayout (1,5));
			
    	// build button panel
		buttonLeft = new JButton (options[0]);
		buttonLeft.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
            	System.out.println ("Action [" + ae.getActionCommand() + "] performed");
            	ThreeButtonDialog.performLeftButtonAction();
            }
 
        });
	        
		buttonMiddle = new JButton (options[1]);
		buttonMiddle.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
            	System.out.println ("Action [" + ae.getActionCommand() + "] performed");
            	ThreeButtonDialog.performCenterButtonAction();
            }
 
        });
		
		buttonRight = new JButton (options[2]);
		buttonRight.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
            	System.out.println ("Action [" + ae.getActionCommand() + "] performed");
            	ThreeButtonDialog.performRightButtonAction();
            }
 
        });
 
		// add buttons
		add(buttonLeft);
		add(new JLabel()); // empty space
		add(new JLabel()); // empty space
		add(buttonMiddle);
		add(buttonRight);
				
		// set focus
        // listen for change in the button panel or one of its ancestors
        addAncestorListener(new AncestorListener() {
        	public void ancestorAdded(AncestorEvent e) {
        		buttonLeft.requestFocus();
        	}
 
        	// don't need these
        	public void ancestorRemoved(AncestorEvent e){}
        	public void ancestorMoved(AncestorEvent e){}
        });
		        
	    }
		    
	    public Insets getInsets() 
	    {
	    	return insets;
	    }
		    
	    /**
	     * 
	     * @param ae
	     */
        public void actionPerformed (ActionEvent ae) {
        	System.out.println ("Action [" + ae.getActionCommand() + "] performed");
        }
}

           
         

	Title
1	ActionListener
2	Problems with ActionListener
3	Action Listener Q
4	Java Swing ActionListener
5	Where to put action listeners.......
6	Help creating ActionListeners for butoons

button action listener

Asked by allelopath in Java AWT & Swing, Java Programming Language

Tags: swing java

About this solution