Java Tutorial/SWT/Browser

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Add CloseWindowListener to Browser

The following HTML link closes the browser window:








Adding OpenWindowListener

Browser conventions allow spawning new browser windows. Things that can trigger a new browser window include the following:

  1. The user right-clicks a link and selects Open in New Window from the context menu (note that you must build this functionality yourself).
  2. The user holds down Shift while clicking a link.
  3. The user clicks a link that has a named target for which no browser currently exists.

When the user performs an action within the browser that spawns a new browser window, any OpenWindowListeners are first notified. OpenWindowListener declares one method:



public void open(WindowEvent event)





Adding ProgressListener to Browser

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;
public class BrowserProgressListener {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setBounds(5,5,600,600);
    final ProgressBar progressBar = new ProgressBar(shell, SWT.NONE);
    progressBar.setBounds(5,650,600,20);
    
    browser.addProgressListener(new ProgressListener() {
      public void changed(ProgressEvent event) {
          if (event.total == 0) return;                            
          int ratio = event.current * 100 / event.total;
          progressBar.setSelection(ratio);
      }
      public void completed(ProgressEvent event) {
        progressBar.setSelection(0);
      }
    });
    
    browser.setUrl("http://jexp.ru");    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Adding StatusTextListener to Browser

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.StatusTextEvent;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class BroserStatusTextListener {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setBounds(5,5,600,600);
    browser.addStatusTextListener(new StatusTextListener() {
      public void changed(StatusTextEvent event) {
        System.out.println(event.text); 
      }
    });
    
    
    browser.setUrl("http://jexp.ru");    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Adding TitleListener to Browser

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Browser example snippet: modify HTML title tag
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.1
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.TitleEvent;
import org.eclipse.swt.browser.TitleListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class HTMLTagModify {
  public static void main(String[] args) {
    final String newTitle = "New Value for Title";
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Browser browser = new Browser(shell, SWT.NONE);
    browser.addTitleListener(new TitleListener() {
      public void changed(TitleEvent event) {
        System.out.println("TitleEvent: " + event.title);
        shell.setText(event.title);
      }
    });
    browser.addProgressListener(new ProgressListener() {
      public void changed(ProgressEvent event) {
      }
      public void completed(ProgressEvent event) {
        /* Set HTML title tag using JavaScript and DOM when page has been loaded */
        boolean result = browser.execute("document.title="" + newTitle + """);
        if (!result) {
          /* Script may fail or may not be supported on certain platforms. */
          System.out.println("Script was not executed.");
        }
      }
    });
    /* Load an HTML document */
    browser.setUrl("http://www.eclipse.org");
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Adding VisibilityWindowListener

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.VisibilityWindowListener;
import org.eclipse.swt.browser.WindowEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class VisibilityWindowListenerUsing {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setBounds(5, 5, 600, 600);
    browser.addVisibilityWindowListener(new VisibilityWindowListener() {
      public void hide(WindowEvent event) {
        System.out.println("hide");
        Browser browser = (Browser) event.widget;
        Shell shell = browser.getShell();
        shell.setVisible(false);
      }
      public void show(WindowEvent event) {
        Browser browser = (Browser) event.widget;
        final Shell shell = browser.getShell();
        System.out.println("Popup blocked.");
        shell.open();
      }
    });
    browser.setUrl("http://jexp.ru");
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Add LocationListener to Browser

The "Location" in LocationListener refers to URLs the browser is loading.

LocationListener has two methods:



void changed(LocationEvent event)
      void changing(LocationEvent event)





Advanced Browser

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.CloseWindowListener;
import org.eclipse.swt.browser.LocationEvent;
import org.eclipse.swt.browser.LocationListener;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.StatusTextEvent;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.browser.WindowEvent;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.FormAttachment;
import org.eclipse.swt.layout.FormData;
import org.eclipse.swt.layout.FormLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class AdvancedBrowser {
  private static final String AT_REST = "Ready";
  public AdvancedBrowser(String location) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Advanced Browser");
    
    shell.setLayout(new FormLayout());
    Composite controls = new Composite(shell, SWT.NONE);
    FormData data = new FormData();
    data.top = new FormAttachment(0, 0);
    data.left = new FormAttachment(0, 0);
    data.right = new FormAttachment(100, 0);
    controls.setLayoutData(data);
    Label status = new Label(shell, SWT.NONE);
    data = new FormData();
    data.left = new FormAttachment(0, 0);
    data.right = new FormAttachment(100, 0);
    data.bottom = new FormAttachment(100, 0);
    status.setLayoutData(data);
    final Browser browser = new Browser(shell, SWT.BORDER);
    data = new FormData();
    data.top = new FormAttachment(controls);
    data.bottom = new FormAttachment(status);
    data.left = new FormAttachment(0, 0);
    data.right = new FormAttachment(100, 0);
    browser.setLayoutData(data);
    controls.setLayout(new GridLayout(7, false));
    Button button = new Button(controls, SWT.PUSH);
    button.setText("Back");
    button.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        browser.back();
      }
    });
    button = new Button(controls, SWT.PUSH);
    button.setText("Forward");
    button.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        browser.forward();
      }
    });
    button = new Button(controls, SWT.PUSH);
    button.setText("Refresh");
    button.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        browser.refresh();
      }
    });
    button = new Button(controls, SWT.PUSH);
    button.setText("Stop");
    button.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        browser.stop();
      }
    });
    final Text url = new Text(controls, SWT.BORDER);
    url.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
    url.setFocus();
    button = new Button(controls, SWT.PUSH);
    button.setText("Go");
    button.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent event) {
        browser.setUrl(url.getText());
      }
    });
    Label throbber = new Label(controls, SWT.NONE);
    throbber.setText(AT_REST);
    shell.setDefaultButton(button);
    browser.addCloseWindowListener(new AdvancedCloseWindowListener());
    browser.addLocationListener(new AdvancedLocationListener(url));
    browser.addProgressListener(new AdvancedProgressListener(throbber));
    browser.addStatusTextListener(new AdvancedStatusTextListener(status));
    // Go to the initial URL
    if (location != null) {
      browser.setUrl(location);
    }
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
  class AdvancedCloseWindowListener implements CloseWindowListener {
    public void close(WindowEvent event) {
      ((Browser) event.widget).getShell().close();
    }
  }
  class AdvancedLocationListener implements LocationListener {
    private Text location;
    public AdvancedLocationListener(Text text) {
      location = text;
    }
    public void changing(LocationEvent event) {
      location.setText("Loading " + event.location + "...");
    }
    public void changed(LocationEvent event) {
      location.setText(event.location);
    }
  }
  class AdvancedProgressListener implements ProgressListener {
    private Label progress;
    public AdvancedProgressListener(Label label) {
      progress = label;
    }
    public void changed(ProgressEvent event) {
      if (event.total != 0) {
        int percent = (int) (event.current / event.total);
        progress.setText(percent + "%");
      } else {
        progress.setText("?");
      }
    }
    public void completed(ProgressEvent event) {
      progress.setText(AT_REST);
    }
  }
  class AdvancedStatusTextListener implements StatusTextListener {
    private Label status;
    public AdvancedStatusTextListener(Label label) {
      status = label;
    }
    public void changed(StatusTextEvent event) {
      status.setText(event.text);
    }
  }
  public static void main(String[] args) {
    new AdvancedBrowser("http://www.google.ru");
  }
}





Browser: bring up a browser (pop-up blocker)

/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;
/*
 * Browser snippet: bring up a browser (pop-up blocker)
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.1
 */
import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.browser.*;
public class Snippet173 {
public static void main(String[] args) {
  Display display = new Display();
  Shell shell = new Shell(display);
  shell.setText("Main Window");
  shell.setLayout(new FillLayout());
  Browser browser = new Browser(shell, SWT.NONE);
  initialize(display, browser);
  shell.open();
  /* any website with popups */
  browser.setUrl("http://www.cnn.ru");
  while (!shell.isDisposed()) {
    if (!display.readAndDispatch())
      display.sleep();
    }
    display.dispose();
  }
/* register WindowEvent listeners */
static void initialize(final Display display, Browser browser) {
  browser.addOpenWindowListener(new OpenWindowListener() {
    public void open(WindowEvent event) {
      Shell shell = new Shell(display);
      shell.setText("New Window");
      shell.setLayout(new FillLayout());
      Browser browser = new Browser(shell, SWT.NONE);
      initialize(display, browser);
      event.browser = browser;
    }
  });
  browser.addVisibilityWindowListener(new VisibilityWindowListener() {
    public void hide(WindowEvent event) {
      Browser browser = (Browser)event.widget;
      Shell shell = browser.getShell();
      shell.setVisible(false);
    }
    public void show(WindowEvent event) {
      Browser browser = (Browser)event.widget;
      final Shell shell = browser.getShell();
      /* popup blocker - ignore windows with no style */
      if (!event.addressBar && !event.menuBar && !event.statusBar && !event.toolBar) {
        System.out.println("Popup blocked.");
        event.display.asyncExec(new Runnable() {
          public void run() {
            shell.close();
          }
        });
        return;
      }
      if (event.location != null) shell.setLocation(event.location);
      if (event.size != null) {
        Point size = event.size;
        shell.setSize(shell.ruputeSize(size.x, size.y));
      }
      shell.open();
    }
  });
  browser.addCloseWindowListener(new CloseWindowListener() {
    public void close(WindowEvent event) {
      Browser browser = (Browser)event.widget;
      Shell shell = browser.getShell();
      shell.close();
    }
  });
}
}





Browser: modify DOM (executing javascript)

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Browser example snippet: modify DOM (executing javascript)
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.1
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class JavascriptExec {
  public static void main(String[] args) {
    final String html = "<html><title>Snippet</title><body><p id="myid">Best Friends</p><p id="myid2">Cat and Dog</p></body></html>";
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Browser browser = new Browser(shell, SWT.BORDER);
    Composite comp = new Composite(shell, SWT.NONE);
    comp.setLayout(new FillLayout(SWT.VERTICAL));
    final Text text = new Text(comp, SWT.MULTI);
    text.setText("var newNode = document.createElement("P"); \r\n"
        + "var text = document.createTextNode("At least when I am around");\r\n"
        + "newNode.appendChild(text);\r\n"
        + "document.getElementById("myid").appendChild(newNode);\r\n" + "\r\n"
        + "document.bgColor="yellow";");
    final Button button = new Button(comp, SWT.PUSH);
    button.setText("Execute Script");
    button.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event event) {
        boolean result = browser.execute(text.getText());
        if (!result) {
          /* Script may fail or may not be supported on certain platforms. */
          System.out.println("Script was not executed.");
        }
      }
    });
    browser.setText(html);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Browser: query DOM node value

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Browser example snippet: query DOM node value
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.1
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.browser.StatusTextEvent;
import org.eclipse.swt.browser.StatusTextListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class DOMQuerySWTBrowser {
  public static void main(String[] args) {
    final String html = "<html><title>Snippet</title><body><p id="myid">Best Friends</p><p id="myid2">Cat and Dog</p></body></html>";
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final Browser browser = new Browser(shell, SWT.NONE);
    browser.addStatusTextListener(new StatusTextListener() {
      public void changed(StatusTextEvent event) {
        browser.setData("query", event.text);
      }
    });
    browser.addProgressListener(new ProgressListener() {
      public void changed(ProgressEvent event) {
      }
      public void completed(ProgressEvent event) {
        /*
         * Use JavaScript to query the desired node content through the Document
         * Object Model
         * 
         * Assign result to the window property status to pass the result to the
         * StatusTextListener This trick is required since <code>execute</code>
         * does not return the <code>String</code> directly.
         */
        boolean result = browser
            .execute("window.status=document.getElementById("myid").childNodes[0].nodeValue;");
        if (!result) {
          /* Script may fail or may not be supported on certain platforms. */
          System.out.println("Script was not executed.");
          return;
        }
        String value = (String) browser.getData("query");
        System.out.println("Node value: " + value);
      }
    });
    /* Load an HTML document */
    browser.setText(html);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Browser: render HTML that includes relative links from memory

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
/*
 * Browser example snippet: render HTML that includes relative links from memory
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.0
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class HTMLRenderRelativeMemory {
  public static void main(String[] args) {
    /* Relative links: use the HTML base tag */
    String html = "<html><head>" + "<base href=\"http://www.eclipse.org/swt/\" >"
        + "<title>HTML Test</title></head>"
        + "<body></body></html>";
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setText(html);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Browser supports the following listeners:

  1. CloseWindowListener
  2. LocationListener
  3. OpenWindowListener
  4. ProgressListener
  5. StatusTextListener
  6. VisibilityWindowListener


Renderer HTML in memory

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class HTMLRendererInMemory {
  public static void main(String[] args) {
    String html = "<HTML><HEAD><TITLE>HTML Test</TITLE></HEAD><BODY>";
    for (int i = 0; i < 100; i++){
      html += "<br><br>";
    }
    html += "</BODY></HTML>";
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setText(html);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Using Browser to load a website

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class BrowserLoadingWebsite {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setBounds(5,5,600,600);
    browser.setUrl("http://jexp.ru");    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Using ProgressBar to display the Browser progress

import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.browser.ProgressEvent;
import org.eclipse.swt.browser.ProgressListener;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ProgressBar;
import org.eclipse.swt.widgets.Shell;
public class BrowserProgress {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    
    Browser browser = new Browser(shell, SWT.NONE);
    browser.setBounds(5,5,600,600);
    final ProgressBar progressBar = new ProgressBar(shell, SWT.NONE);
    progressBar.setBounds(5,650,600,20);
    
    browser.addProgressListener(new ProgressListener() {
      public void changed(ProgressEvent event) {
          if (event.total == 0) return;                            
          int ratio = event.current * 100 / event.total;
          progressBar.setSelection(ratio);
      }
      public void completed(ProgressEvent event) {
        progressBar.setSelection(0);
      }
    });
    
    browser.setUrl("http://jexp.ru");    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}