[英]How can I use addActionListener on a panel
I have to classes that extends Panel and i want that one of the class to can use addActionListener and one to use addMouseListener. 我必须扩展面板的类,并且我希望该类之一可以使用addActionListener,而另一类使用addMouseListener。 I know that i have to override this methods but i tried and i really don't know how. 我知道我必须重写此方法,但我尝试过,但我真的不知道如何做。
public class QButton extends Panel implements MouseListener,ActionListener{
public Label text;
ImagePanel image;
ActionListener listener;
//.........
public void addActionListener(ActionListener listener)
{
// What do i write here?`enter code here`
}
}
public class ImagePanel extends Component {
public Image resized;
public String image;
public MouseListener l;
//...........
public void paint(Graphics g) {
g.drawImage(resized, 0, 0, this);
}
public void addMouseListener(MouseListener l) {
//What do i write here?`enter code here`
}
}
you can use inbuilt moselistener same as actionlistener or for specific use your custom adapter Listner 您可以使用与动作侦听器相同的内置moselistener,也可以将自定义适配器侦听器用于特定用途
...//where initialization occurs: ... //发生初始化的位置:
MyListener myListener = new MyListener();
addMouseListener(myListener);
addMouseMotionListener(myListener);
as specified at http://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html 如http://docs.oracle.com/javase/tutorial/uiswing/events/mousemotionlistener.html中指定的
you can add MouseListener (or MouseAdapter) to any JComponents , but you can't add ActionListener to the JComponents
that didn't implements this method, otherwise Compiler or IDE returns Exceptions 您可以将MouseListener (或MouseAdapter)添加到任何JComponents中 ,但是不能将ActionListener添加到未实现此方法的JComponents
中,否则Compiler或IDE返回Exceptions
for example 例如
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class CustomComponent extends JFrame {
private static final long serialVersionUID = 1L;
public CustomComponent() {
setTitle("Custom Component Graphics2D");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void display() {
add(new CustomComponents());//
pack();
// enforces the minimum size of both frame and component
setMinimumSize(getSize());
setVisible(true);
}
public static void main(String[] args) {
CustomComponent main = new CustomComponent();
main.display();
}
}
class CustomComponents extends JPanel implements MouseListener, ActionListener {
private static final long serialVersionUID = 1L;
public CustomComponents() {
addMouseListener(this);
//addActionListener(this);//JPanel doesn't implements ActionListener directly
}
@Override
public Dimension getMinimumSize() {
return new Dimension(100, 100);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(400, 300);
}
@Override
public void paintComponent(Graphics g) {
int margin = 10;
Dimension dim = getSize();
super.paintComponent(g);
g.setColor(Color.red);
g.fillRect(margin, margin, dim.width - margin * 2, dim.height - margin * 2);
}
public void mouseClicked(MouseEvent e) {
System.out.println("mouseClicked");
}
public void mousePressed(MouseEvent e) {
System.out.println("mousePressed");
}
public void mouseReleased(MouseEvent e) {
System.out.println("mouseReleased");
}
public void mouseEntered(MouseEvent e) {
System.out.println("mouseEntered");
}
public void mouseExited(MouseEvent e) {
System.out.println("mouseExited");
}
public void actionPerformed(ActionEvent e) {
System.out.println("actionPerformed");
}
}
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