如何添加ActionListener来自定义组件 [英] How to add ActionListener to customize component

问题描述

我创建了一个组件，并想添加 ActionListener 来自定义组件。

我想创建一个类似于的组件JButton 并在 Events 设计视图对话框中显示 actionPerformed 事件。

JBaseComponent 类将从 JComponent 派生。

代码：

 公共类JCButton扩展了JBaseComponent实现ActionListener， ItemSelectable，ChangeListener {
 
 private JButton _button = new JButton（）; 
 private ActionEvent _actevent = new ActionEvent（this，ActionEvent.ACTION_PERFORMED，）; 
 
 public JCButton（）{
 super（）; 
 _button.setPreferredSize（new Dimension（105，25））; 
 _button.setFocusTraversalKeysEnabled（false）; 
 
 _button.addMouseListener（new MouseAdapter（）{
 
 public void mousePressed（MouseEvent e）{
 JComponent c =（JComponent）e.getSource（）; 
 TransferHandler handler = c.getTransferHandler（）; 
 handler.exportAsDrag（c，e，TransferHandler.COPY）; 
} 
}）; 
 
 _button.setTransferHandler（new TransferHandler（ btn））; 
 
 setColorFocus（false）; 
 
 _button.addActionListener（this）; 
 actionPerformed（_actevent）; 
 addActionListener（this）; 
 revalidate（）; 
 repaint（）; 
 add（_button）; 
} 
 
 public void setText（String txt）{
 _button.setText（txt）; 
} 
 
 public void setIcon（Icon ico）{
 _button.setIcon（ico）; 
} 
 
 public void addActionListener（ActionListener act）{
 _button.addActionListener（act）; 
} 
 
 @Override 
 public void actionPerformed（ActionEvent e）{
} 
 
 @Override 
 public Object [] getSelectedObjects（）{
返回null; 
} 
 
 @Override 
 public void addItemListener（ItemListener l）{
 
} 
 
 @Override 
 public void removeItemListener（ItemListener l）{
 
} 
 
 @Override 
 public void stateChanged（ChangeEvent e）{
 
} 
} 
  

解决方案

如果您真的是不能为此使用 JButton ，您的下一个最佳选择是扩展 AbstractButton ，其中包括 EventListenerList 在

 导入java.awt.EventQueue; 
 import java.awt.event.ActionEvent; 
 import javax.swing.AbstractAction; 
 import javax.swing.AbstractButton; 
 import javax.swing.Action; 
 import javax.swing.DefaultButtonModel; 
 import javax.swing.JFrame; 
 import javax.swing.UIManager; 
 import javax.swing.plaf.ButtonUI; 
 
 / ** @see https://stackoverflow.com/a/14429304/230513 * / 
公共类JCButtonTest {
 
 private void display（）{ 
 JFrame f = new JFrame（ JCButtonTest）; 
 f.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）; 
 f.add（new JCButton（new AbstractAction（ JCButton））{
 
 @Override 
 public void actionPerformed（ActionEvent e）{
 System.out.println （e）; 
} 
}））； 
 f.pack（）; 
 f.setLocationRelativeTo（null）; 
 f.setVisible（true）; 
} 
 
私有静态类JCButton扩展了AbstractButton {
 
 public static final int SIZE = 32; 
 
 public JCButton（Action action）{
 this.setModel（new DefaultButtonModel（））; 
 System.out.println（action.getValue（Action.NAME））; 
 this.init（（String）action.getValue（Action.NAME），null）; 
 this.addActionListener（action）; 
} 
 
 @Override 
 public void updateUI（）{
 setUI（（ButtonUI）UIManager.getUI（this））; 
} 
 
 @Override 
 public String getUIClassID（）{
 return ButtonUI; 
} 
} 
 
 public static void main（String [] args）{
 EventQueue.invokeLater（new Runnable（）{
 
 @Override 
 public void run（）{
 new JCButtonTest（）。display（）; 
} 
}）; 
} 
} 
  

I created a component and want to add ActionListener to customize component.
I want to create a component like JButton and show actionPerformed event in Events Dialog on design view.

JBaseComponent class will be derived from JComponent.

Code:

public class JCButton extends JBaseComponent implements ActionListener,ItemSelectable,ChangeListener{

private JButton _button=new JButton();
private ActionEvent _actevent=new ActionEvent(this,ActionEvent.ACTION_PERFORMED,"");

public JCButton() {
    super();
    _button.setPreferredSize(new Dimension(105, 25));
    _button.setFocusTraversalKeysEnabled(false);

     _button.addMouseListener(new MouseAdapter() {

        public void mousePressed(MouseEvent e) {
            JComponent c = (JComponent) e.getSource();
            TransferHandler handler = c.getTransferHandler();
            handler.exportAsDrag(c, e, TransferHandler.COPY);
        }
    });

    _button.setTransferHandler(new TransferHandler("btn"));

    setColorFocus(false);

    _button.addActionListener(this);
    actionPerformed(_actevent);
    addActionListener(this);
   revalidate();
   repaint();
    add(_button);
}

public void setText(String txt){
    _button.setText(txt);
}

public void setIcon(Icon ico){
    _button.setIcon(ico);
}

public void addActionListener(ActionListener act){
    _button.addActionListener(act);
}

@Override
public void actionPerformed(ActionEvent e) {
}

@Override
public Object[] getSelectedObjects() {
    return null;
}

@Override
public void addItemListener(ItemListener l) {

}

@Override
public void removeItemListener(ItemListener l) {

}

@Override
public void stateChanged(ChangeEvent e) {

}
}

解决方案

If you really can't use a JButton for this, your next best option is extending AbstractButton, which includes the EventListenerList plumbing mentioned here. For example,

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.AbstractButton;
import javax.swing.Action;
import javax.swing.DefaultButtonModel;
import javax.swing.JFrame;
import javax.swing.UIManager;
import javax.swing.plaf.ButtonUI;

/** @see https://stackoverflow.com/a/14429304/230513 */
public class JCButtonTest {

    private void display() {
        JFrame f = new JFrame("JCButtonTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new JCButton(new AbstractAction("JCButton") {

            @Override
            public void actionPerformed(ActionEvent e) {
                System.out.println(e);
            }
        }));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }

    private static class JCButton extends AbstractButton {

        public static final int SIZE = 32;

        public JCButton(Action action) {
            this.setModel(new DefaultButtonModel());
            System.out.println(action.getValue(Action.NAME));
            this.init((String) action.getValue(Action.NAME), null);
            this.addActionListener(action);
        }

        @Override
        public void updateUI() {
            setUI((ButtonUI) UIManager.getUI(this));
        }

        @Override
        public String getUIClassID() {
            return "ButtonUI";
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new JCButtonTest().display();
            }
        });
    }
}

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