SWT Browser

《Eclipse SWT/JFACE 核心应用》 清华大学出版社 9.12 浏览器

◆ CloseWindowListener：当关闭浏览器时所触发的事件。
◆ LocationListener：当浏览器转到另一个地址时所触发的事件。
◆ OpenWindowListener：当打开一个浏览器窗口时触发的事件。
◆ ProgressListener：当装载一个网页时进行的事件。
◆ StatusTextListener：当浏览器状态栏改变时触发的事件。
◆ TitleListener：当浏览器标题改变时触发的事件。
◆ VisibilityWindowListener：当浏览器窗口隐藏或显示时触发的事件。

package www.swt.com.ch9;

import org.eclipse.swt.layout.GridLayout;

public class SimpleSWTBrowser {

//定义浏览器的标题
public static final String APP_TITLE = "Simple SWT Browser";
//定义主页的url
public static final String HOME_URL = "http://www.eclipse.org/vep/";
//声明主窗口和其它控件
private org.eclipse.swt.widgets.Shell sShell = null;
private Button backButton = null;//后退按钮
private Button forwardButton = null;//前进按钮
private Button stopButton = null;//停止按钮
private Text locationText = null;//显示url的文本框
private Button goButton = null;//转向按钮
private Browser browser = null;//浏览器对象
private Button homeButton = null;//主页按钮
private Label statusText = null;//显示浏览器状态的文本框
private ProgressBar progressBar = null;//装载页面时的进度条
private Button refreshButton = null;//刷新按钮

//初始化浏览器
private void createBrowser() {
   org.eclipse.swt.layout.GridData gridData3 = new org.eclipse.swt.layout.GridData();
   //创建浏览器对象
   browser = new Browser(sShell, SWT.BORDER);
   gridData3.horizontalSpan = 7;
   gridData3.horizontalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData3.verticalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData3.grabExcessVerticalSpace = true;
   //设置浏览器布局
   browser.setLayoutData(gridData3);
   //为浏览器注册标题改变事件
   browser.addTitleListener(new org.eclipse.swt.browser.TitleListener() {
    public void changed(org.eclipse.swt.browser.TitleEvent e) {
     sShell.setText(APP_TITLE + " - " + e.title);
    }
   });
   //为浏览器注册地址改变事件
   browser.addLocationListener(new org.eclipse.swt.browser.LocationListener() {
    public void changing(org.eclipse.swt.browser.LocationEvent e) {
     locationText.setText(e.location);
    }

    public void changed(org.eclipse.swt.browser.LocationEvent e) {
    }
   });
   //为浏览器注册装载网页事件
   browser.addProgressListener(new org.eclipse.swt.browser.ProgressListener() {
    //当装载时，设置装载的进度，并且设置停止按钮可用
    public void changed(org.eclipse.swt.browser.ProgressEvent e) {
     if (!stopButton.isEnabled() && e.total != e.current) {
      stopButton.setEnabled(true);
     }
     progressBar.setMaximum(e.total);
     progressBar.setSelection(e.current);
    }
    //装载完成后设置停止按钮，后退按钮，前进按钮和进度条的状态
    public void completed(org.eclipse.swt.browser.ProgressEvent e) {
     stopButton.setEnabled(false);
     backButton.setEnabled(browser.isBackEnabled());
     forwardButton.setEnabled(browser.isForwardEnabled());
     progressBar.setSelection(0);
    }
   });
   //注册浏览器状态改变事件
   browser.addStatusTextListener(new org.eclipse.swt.browser.StatusTextListener() {
    public void changed(org.eclipse.swt.browser.StatusTextEvent e) {
     statusText.setText(e.text);
    }
   });
   //初始状态打开主页的url
   browser.setUrl(HOME_URL);
}

public static void main(String[] args) {
   org.eclipse.swt.widgets.Display display = org.eclipse.swt.widgets.Display.getDefault();
   SimpleSWTBrowser thisClass = new SimpleSWTBrowser();
   thisClass.createSShell();
   thisClass.sShell.open();

   while (!thisClass.sShell.isDisposed()) {
    if (!display.readAndDispatch())
     display.sleep();
   }
   display.dispose();
}

//创建窗口和窗口的控件
private void createSShell() {
   sShell = new org.eclipse.swt.widgets.Shell();
   org.eclipse.swt.layout.GridLayout gridLayout1 = new GridLayout();
   org.eclipse.swt.layout.GridData gridData2 = new org.eclipse.swt.layout.GridData();
   org.eclipse.swt.layout.GridData gridData4 = new org.eclipse.swt.layout.GridData();
   org.eclipse.swt.layout.GridData gridData5 = new org.eclipse.swt.layout.GridData();
   org.eclipse.swt.layout.GridData gridData6 = new org.eclipse.swt.layout.GridData();
   org.eclipse.swt.layout.GridData gridData7 = new org.eclipse.swt.layout.GridData();
   org.eclipse.swt.layout.GridData gridData8 = new org.eclipse.swt.layout.GridData();
   backButton = new Button(sShell, SWT.ARROW | SWT.LEFT);
   forwardButton = new Button(sShell, SWT.ARROW | SWT.RIGHT);
   stopButton = new Button(sShell, SWT.NONE);
   refreshButton = new Button(sShell, SWT.NONE);
   homeButton = new Button(sShell, SWT.NONE);
   locationText = new Text(sShell, SWT.BORDER);
   goButton = new Button(sShell, SWT.NONE);
   createBrowser();
   progressBar = new ProgressBar(sShell, SWT.BORDER);
   statusText = new Label(sShell, SWT.NONE);
   sShell.setText(APP_TITLE);
   sShell.setLayout(gridLayout1);
   gridLayout1.numColumns = 7;
   backButton.setEnabled(false);
   backButton.setToolTipText("Navigate back to the previous page");
   backButton.setLayoutData(gridData6);
   forwardButton.setEnabled(false);
   forwardButton.setToolTipText("Navigate forward to the next page");
   forwardButton.setLayoutData(gridData5);
   stopButton.setText("Stop");
   stopButton.setEnabled(false);
   stopButton.setToolTipText("Stop the loading of the current page");
   goButton.setText("Go!");
   goButton.setLayoutData(gridData8);
   goButton.setToolTipText("Navigate to the selected web address");
   gridData2.grabExcessHorizontalSpace = true;
   gridData2.horizontalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData2.verticalAlignment = org.eclipse.swt.layout.GridData.CENTER;
   locationText.setLayoutData(gridData2);
   locationText.setText(HOME_URL);
   locationText.setToolTipText("Enter a web address");
   homeButton.setText("Home");
   homeButton.setToolTipText("Return to home page");
   statusText.setText("Done");
   statusText.setLayoutData(gridData7);
   gridData4.horizontalSpan = 5;
   progressBar.setLayoutData(gridData4);
   progressBar.setEnabled(false);
   progressBar.setSelection(0);
   gridData5.horizontalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData5.verticalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData6.horizontalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData6.verticalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData7.horizontalSpan = 1;
   gridData7.grabExcessHorizontalSpace = true;
   gridData7.horizontalAlignment = org.eclipse.swt.layout.GridData.FILL;
   gridData7.verticalAlignment = org.eclipse.swt.layout.GridData.CENTER;
   gridData8.horizontalAlignment = org.eclipse.swt.layout.GridData.END;
   gridData8.verticalAlignment = org.eclipse.swt.layout.GridData.CENTER;
   refreshButton.setText("Refresh");
   refreshButton.setToolTipText("Refresh the current page");
   sShell.setSize(new org.eclipse.swt.graphics.Point(553, 367));
   //注册显示地址的文本框事件
   locationText.addMouseListener(new org.eclipse.swt.events.MouseAdapter() {
    public void mouseUp(org.eclipse.swt.events.MouseEvent e) {
     locationText.selectAll();
    }
   });
   locationText.addKeyListener(new org.eclipse.swt.events.KeyAdapter() {
    public void keyPressed(org.eclipse.swt.events.KeyEvent e) {
     // Handle the press of the Enter key in the locationText.
     // This will browse to the entered text.
     if (e.character == SWT.LF || e.character == SWT.CR) {
      e.doit = false;
      browser.setUrl(locationText.getText());
     }
    }
   });
   refreshButton.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.refresh();//重新载入
    }
   });
   locationText.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.setUrl(locationText.getText());//设置浏览器的指向的url
    }
   });
   stopButton.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.stop();//停止装载网页
    }
   });
   backButton.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.back();//后退
    }
   });
   forwardButton.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.forward();//前进
    }
   });
   homeButton.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.setUrl(HOME_URL);//设置主页
    }
   });
   goButton.addSelectionListener(new org.eclipse.swt.events.SelectionAdapter() {
    public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
     browser.setUrl(locationText.getText());//转向地址的网页
    }
   });
}
}
显示效果：