toolbar.java

这是《Java图形用户界面设计与实例》一书配套的源代码

//ToolBar.java
//Tool bar which contains interface components

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ToolBar extends JToolBar implements ActionListener{

    private JButton jbBack = new JButton(new ImageIcon("./Back16.gif"));
    private JButton jbForward = new JButton(new ImageIcon("./Forward16.gif"));
    private JButton jbRefresh = new JButton(new ImageIcon("./Refresh16.gif"));
    private JButton jbGo = new JButton("Go");
    private JButton jbShogun = new JButton(new ImageIcon("./s.gif"));
    private JTextField jtfLocation = new JTextField(20);

    private BrowserFrame bfRef;

    public ToolBar() {

       this(new BrowserFrame());
    }

    public ToolBar(BrowserFrame bf) {
        bfRef = bf;

        setName("Toolbar");
        setLayout(new FlowLayout(FlowLayout.LEFT,5,0));

        jbBack.setToolTipText("Back");        //Tool tip 
        jbForward.setToolTipText("Forward");
        jbRefresh.setToolTipText("Refresh");
        jbGo.setToolTipText("Go");
        jbShogun.setToolTipText("Homepage");

        this.add(jbBack);
        this.add(jbForward);
        this.add(jbRefresh);
        this.add(new JLabel("Location:"));
        this.add(jtfLocation);
        this.add(jbGo);
        this.add(new JLabel("   "));
        this.add(jbShogun);

        jbBack.addActionListener(this); //注册 action listeners
        jbForward.addActionListener(this);
        jbRefresh.addActionListener(this);
        jtfLocation.addActionListener(this);
        jbGo.addActionListener(this);
        jbShogun.addActionListener(this);
    }


    public void actionPerformed(ActionEvent e) {

        if ((e.getSource() == jbGo) || (e.getSource() == jtfLocation))//转到
            bfRef.setCurrentURL(jtfLocation.getText());

        else if(e.getSource() == jbRefresh)//刷新
            bfRef.refreshURL();

        else if(e.getSource() == jbBack)//后退
            bfRef.goBack();

        else if (e.getSource() == jbForward)//前进
            bfRef.goForward();

        else if (e.getSource() == jbShogun)//默认值
            bfRef.setCurrentURL("http://www.zsu.edu.cn");
    }


    public void setTextField(String s) {
        jtfLocation.setText(s);
    }

}