ActionListener interface

[tsantana]

Hello All,

I am studying Java as a personal goal for this year. In a attempt to convert a batch time entry program into a visual interface program, I decided to learn about Gui programming on java. I am still getting AWT though. I got my self into the following issue:

Given the following class, I am not able to get a dialog BOX displayed when I press the "Press Me" button:

package mainProgram;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class GraphicTest extends Button implements ActionListener{

private Frame mainScreen;
private List mainList;
private Button mainButton;
private Dialog dialogBox;

public void actionPerformed(ActionEvent actEvent){

String pressedButton = actEvent.getActionCommand();

if (pressedButton.equals("Press Me")) {

dialogBox.setVisible(true);

}

}

public void load() {

mainScreen = new Frame("Main Window");
mainList = new List();
mainButton = new Button("Press Me");
dialogBox = new Dialog(mainScreen, "Dialog", true);

mainList.add("A", 0);
mainList.add("List", 1);

mainScreen.setLayout(new GridLayout(9,2));
mainScreen.add(new Label("Button"));
mainScreen.add(mainButton);
mainScreen.add(new Label("Choice"));
mainScreen.add(new Choice());
mainScreen.add(new Label("Label"));
mainScreen.add(new Label("This is a Label"));
mainScreen.add(new Label("ScrollBar"));
mainScreen.add(new Scrollbar());
mainScreen.add(new Label("TextField"));
mainScreen.add(new TextField());
mainScreen.add(new Label("Canvas"));
mainScreen.add(new Canvas());
mainScreen.add(new Label("List"));
mainScreen.add(mainList);
mainScreen.add(new Label("TextArea"));
mainScreen.add(new TextArea());

mainScreen.pack();
mainScreen.setVisible(true);

mainButton.setActionCommand("Press Me");
this.addActionListener(this);

}

public static void main(String[] args){

GraphicTest graphictest = new GraphicTest();
graphictest.load();

}
}



Could anyone tell me what I did wrong and help me fix it, please?

Thanks all for the help.

[hardwired]

Code:

// change this
this.addActionListener(this);
// to this
mainButton.addActionListener(this);

Code:

import java.awt.*;
import java.awt.event.*;

public class GraphicTestRx extends Button implements ActionListener {
    private Frame mainScreen;
    private List mainList;
    private Button mainButton;
    private Dialog dialogBox;

    public void actionPerformed(ActionEvent actEvent){
        String pressedButton = actEvent.getActionCommand();
        if (pressedButton.equals("Press Me")) {
            dialogBox.setVisible(true);
        }
    }

    public void load() {
        mainScreen = new Frame("Main Window");
        mainScreen.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
        mainList = new List();
        mainButton = new Button("Press Me");
        dialogBox = new Dialog(mainScreen, "Dialog", true);
        dialogBox.setSize(200,200);
        dialogBox.setLocation(200,200);
        dialogBox.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                ((Dialog)e.getSource()).dispose();
            }
        });

        mainList.add("A", 0);
        mainList.add("List", 1);

//        mainScreen.setLayout(new GridLayout(9,2));
        mainScreen.setLayout(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(2,0,2,0);
        addComponents(new Label("Button"), mainButton, mainScreen, gbc);
        addComponents(new Label("Choice"), new Choice(), mainScreen, gbc);
        addComponents(new Label("Label"),
                      new Label("This is a Label"), mainScreen, gbc);
        addComponents(new Label("ScrollBar"),
                      new Scrollbar(), mainScreen, gbc);
        addComponents(new Label("TextField"),
                      new TextField(), mainScreen, gbc);
        Canvas canvas = new Canvas();
        canvas.setBackground(Color.blue);
        addComponents(new Label("Canvas"), canvas, mainScreen, gbc);
        addComponents(new Label("List"), mainList, mainScreen, gbc);
        addComponents(new Label("TextArea"),
                      new TextArea("hello world"), mainScreen, gbc);

        mainScreen.pack();
        mainScreen.setVisible(true);

        mainButton.setActionCommand("Press Me");
        mainButton.addActionListener(this);
    }

    private void addComponents(Component c1, Component c2, Container c,
                               GridBagConstraints gbc) {
        gbc.gridwidth = GridBagConstraints.RELATIVE;
        c.add(c1, gbc);
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        c.add(c2, gbc);
    }

    public static void main(String[] args){
        GraphicTestRx graphictest = new GraphicTestRx();
        graphictest.load();
    }
}

[tsantana]

hardwired,

Your code looks wonderfull. The frame looks really nice, not to mention the code to close the window which I was missing and looking forward to learn.

Oh boy, I wish I had your knowledge.

Thanks a lot!!!