如何定义从一个不同的类中的多个动作的JButton

问题描述

我写一个程序，我需要为一个单独的类取决于被点击的按钮做不同的动作。

I am writing a program where I need to do different actions for a separate class depending on which button is clicked.

public class NewJFrame{
    public static JButton b1;
    public static JButton b2;
    public static JButton b3;
}

public class Slot{

    int value;
    JButton button;

    Slot(int value, JButton button)
    {
        this.value=value;
        this.button=button;
    }
}

public class Game{
    Slot[] slots=new Slot[3];
    Game(){
        slots[0]=new Slot(1,NewJFrame.b1);
        slots[1]=new Slot(2,NewJFrame.b2);
        slots[2]=new Slot(3,NewJFrame.b3);
    }
    public void actionPerformed(ActionEvent e) {
        for(int i=0;i<3;i++){
            if(e.getSource()==slots[i].button)
                slots[i].button.setText(String.valueOf(value));
        }
    }
}

这样的事情。需要注意的是，我在GUI设计完全的新手。

Something like this. Note that, I'm completely novice at GUI designing.

推荐答案

使用动作其他地方在你的程序，例如封装使用功能按钮，菜单和工具栏。下面所示的 BeaconPanel 出口的几个动作，可以很容易在控制面板中使用它们。限制实例的增殖，动作本身可以是类成员。作为一个练习，修改控制到或相同的动作添加到菜单。

Use Action to encapsulate functionality for use elsewhere in your program, e.g. buttons, menus and toolbars. The BeaconPanel shown below exports several actions that make it easy to use them in a control panel. To limit the proliferation of instances, the actions themselves can be class members. As an exercise, change controls to a JToolBar or add the same actions to a menu.

JPanel controls = new JPanel();
controls.add(new JButton(beaconPanel.getFlashAction()));
controls.add(new JButton(beaconPanel.getOnAction()));
controls.add(new JButton(beaconPanel.getOffAction()));

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.Timer;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

/** @see http://stackoverflow.com/a/37063037/230513 */
public class Beacon {

    private static class BeaconPanel extends JPanel {

        private static final int N = 16;
        private final Ellipse2D.Double ball = new Ellipse2D.Double();
        private final Timer timer;
        private final Color on;
        private final Color off;
        private final AbstractAction flashAction = new AbstractAction("Flash") {
            @Override
            public void actionPerformed(ActionEvent e) {
                timer.restart();
            }
        };
        private final AbstractAction onAction = new AbstractAction("On") {
            @Override
            public void actionPerformed(ActionEvent e) {
                stop(on);
            }
        };
        private final AbstractAction offAction = new AbstractAction("Off") {
            @Override
            public void actionPerformed(ActionEvent e) {
                stop(off);
            }
        };
        private Color currentColor;

        public BeaconPanel(Color on, Color off) {
            this.on = on;
            this.off = off;
            this.currentColor = on;
            timer = new Timer(500, new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    changeColors();
                }
            });
        }

        public void start() {
            timer.start();
        }

        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
            int x = getX() + N;
            int y = getY() + N;
            int w = getWidth() - 2 * N;
            int h = getHeight() - 2 * N;
            ball.setFrame(x, y, w, h);
            g2.setColor(currentColor);
            g2.fill(ball);
            g2.setColor(Color.black);
            g2.draw(ball);
        }

        private void changeColors() {
            currentColor = currentColor == on ? off : on;
            repaint();
        }

        private void stop(Color color) {
            timer.stop();
            currentColor = color;
            repaint();
        }

        public Action getFlashAction() {
            return flashAction;
        }

        public Action getOnAction() {
            return onAction;
        }

        public Action getOffAction() {
            return offAction;
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(N * N, N * N);
        }
    }

    public static void display() {
        JFrame f = new JFrame("Beacon");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        final BeaconPanel beaconPanel = new BeaconPanel(Color.orange, Color.orange.darker());
        f.add(beaconPanel);
        JPanel controls = new JPanel();
        controls.add(new JButton(beaconPanel.getFlashAction()));
        controls.add(new JButton(beaconPanel.getOnAction()));
        controls.add(new JButton(beaconPanel.getOffAction()));
        f.add(controls, BorderLayout.SOUTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        beaconPanel.start();
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                Beacon.display();
            }
        });
    }
}

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