Java tutorial
/******************************************************************************* * All Right Reserved. Copyright (c) 1998, 2004 Jackwind Li Guojie * * Created on 2004-4-10 20:04:08 by JACK $Id$ * ******************************************************************************/ import java.text.MessageFormat; import java.util.MissingResourceException; import org.eclipse.swt.SWT; import org.eclipse.swt.SWTError; 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.OpenWindowListener; 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.TitleEvent; import org.eclipse.swt.browser.TitleListener; import org.eclipse.swt.browser.VisibilityWindowListener; import org.eclipse.swt.browser.WindowEvent; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.graphics.Rectangle; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.layout.FormAttachment; import org.eclipse.swt.layout.FormData; import org.eclipse.swt.layout.FormLayout; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.ProgressBar; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Text; import org.eclipse.swt.widgets.ToolBar; import org.eclipse.swt.widgets.ToolItem; public class BrowserExample { //static ResourceBundle resourceBundle = // ResourceBundle.getBundle("examples_browser"); int index; boolean busy; Image images[]; Text location; Browser browser; static final String[] imageLocations = { "eclipse01.bmp", "eclipse02.bmp", "eclipse03.bmp", "eclipse04.bmp", "eclipse05.bmp", "eclipse06.bmp", "eclipse07.bmp", "eclipse08.bmp", "eclipse09.bmp", "eclipse10.bmp", "eclipse11.bmp", "eclipse12.bmp", }; static final String iconLocation = "java2s.gif"; /** * Creates an instance of a ControlExample embedded inside the supplied * parent Composite. * * @param parent * the container of the example */ public BrowserExample(Composite parent) { final Display display = parent.getDisplay(); FormLayout layout = new FormLayout(); parent.setLayout(layout); ToolBar toolbar = new ToolBar(parent, SWT.NONE); final ToolItem itemBack = new ToolItem(toolbar, SWT.PUSH); itemBack.setText(getResourceString("Back")); final ToolItem itemForward = new ToolItem(toolbar, SWT.PUSH); itemForward.setText(getResourceString("Forward")); final ToolItem itemStop = new ToolItem(toolbar, SWT.PUSH); itemStop.setText(getResourceString("Stop")); final ToolItem itemRefresh = new ToolItem(toolbar, SWT.PUSH); itemRefresh.setText(getResourceString("Refresh")); final ToolItem itemGo = new ToolItem(toolbar, SWT.PUSH); itemGo.setText(getResourceString("Go")); location = new Text(parent, SWT.BORDER); images = new Image[] { new Image(display, "java2s.gif") }; final Canvas canvas = new Canvas(parent, SWT.NO_BACKGROUND); final Rectangle rect = images[0].getBounds(); canvas.addListener(SWT.Paint, new Listener() { public void handleEvent(Event e) { Point pt = canvas.getSize(); e.gc.drawImage(images[index], 0, 0, rect.width, rect.height, 0, 0, pt.x, pt.y); } }); canvas.addListener(SWT.MouseDown, new Listener() { public void handleEvent(Event e) { browser.setUrl(getResourceString("Startup")); } }); display.asyncExec(new Runnable() { public void run() { if (canvas.isDisposed()) return; if (busy) { index++; if (index == images.length) index = 0; canvas.redraw(); } display.timerExec(150, this); } }); final Label status = new Label(parent, SWT.NONE); final ProgressBar progressBar = new ProgressBar(parent, SWT.NONE); FormData data = new FormData(); data.top = new FormAttachment(0, 5); toolbar.setLayoutData(data); data = new FormData(); data.left = new FormAttachment(0, 0); data.right = new FormAttachment(100, 0); data.top = new FormAttachment(canvas, 5, SWT.DEFAULT); data.bottom = new FormAttachment(status, -5, SWT.DEFAULT); try { browser = new Browser(parent, SWT.NONE); browser.setLayoutData(data); } catch (SWTError e) { /* Browser widget could not be instantiated */ Label label = new Label(parent, SWT.CENTER | SWT.WRAP); label.setText(getResourceString("BrowserNotCreated")); label.setLayoutData(data); } data = new FormData(); data.width = 24; data.height = 24; data.top = new FormAttachment(0, 5); data.right = new FormAttachment(100, -5); canvas.setLayoutData(data); data = new FormData(); data.top = new FormAttachment(toolbar, 0, SWT.TOP); data.left = new FormAttachment(toolbar, 5, SWT.RIGHT); data.right = new FormAttachment(canvas, -5, SWT.DEFAULT); location.setLayoutData(data); data = new FormData(); data.left = new FormAttachment(0, 5); data.right = new FormAttachment(progressBar, 0, SWT.DEFAULT); data.bottom = new FormAttachment(100, -5); status.setLayoutData(data); data = new FormData(); data.right = new FormAttachment(100, -5); data.bottom = new FormAttachment(100, -5); progressBar.setLayoutData(data); if (browser != null) { itemBack.setEnabled(browser.isBackEnabled()); itemForward.setEnabled(browser.isForwardEnabled()); Listener listener = new Listener() { public void handleEvent(Event event) { ToolItem item = (ToolItem) event.widget; if (item == itemBack) browser.back(); else if (item == itemForward) browser.forward(); else if (item == itemStop) browser.stop(); else if (item == itemRefresh) browser.refresh(); else if (item == itemGo) browser.setUrl(location.getText()); } }; browser.addLocationListener(new LocationListener() { public void changed(LocationEvent event) { busy = true; if (event.top) location.setText(event.location); } public void changing(LocationEvent event) { } }); browser.addProgressListener(new ProgressListener() { public void changed(ProgressEvent event) { if (event.total == 0) return; int ratio = event.current * 100 / event.total; progressBar.setSelection(ratio); busy = event.current != event.total; if (!busy) { index = 0; canvas.redraw(); } } public void completed(ProgressEvent event) { itemBack.setEnabled(browser.isBackEnabled()); itemForward.setEnabled(browser.isForwardEnabled()); progressBar.setSelection(0); busy = false; index = 0; canvas.redraw(); } }); browser.addStatusTextListener(new StatusTextListener() { public void changed(StatusTextEvent event) { status.setText(event.text); } }); if (parent instanceof Shell) { final Shell shell = (Shell) parent; browser.addTitleListener(new TitleListener() { public void changed(TitleEvent event) { shell.setText(event.title + " - " + getResourceString("window.title")); } }); } itemBack.addListener(SWT.Selection, listener); itemForward.addListener(SWT.Selection, listener); itemStop.addListener(SWT.Selection, listener); itemRefresh.addListener(SWT.Selection, listener); itemGo.addListener(SWT.Selection, listener); location.addListener(SWT.DefaultSelection, new Listener() { public void handleEvent(Event e) { browser.setUrl(location.getText()); } }); initialize(display, browser); browser.setUrl(getResourceString("Startup")); } } /** * Gets a string from the resource bundle. We don't want to crash because of * a missing String. Returns the key if not found. */ static String getResourceString(String key) { try { return "key"; } catch (MissingResourceException e) { return key; } catch (NullPointerException e) { return "!" + key + "!"; } } /** * Gets a string from the resource bundle and binds it with the given * arguments. If the key is not found, return the key. */ static String getResourceString(String key, Object[] args) { try { return MessageFormat.format(getResourceString(key), args); } catch (MissingResourceException e) { return key; } catch (NullPointerException e) { return "!" + key + "!"; } } static void initialize(final Display display, Browser browser) { browser.addOpenWindowListener(new OpenWindowListener() { public void open(WindowEvent event) { System.out.println("Open"); Shell shell = new Shell(display); 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) { } public void show(WindowEvent event) { System.out.println("Show"); Browser browser = (Browser) event.widget; Shell shell = browser.getShell(); if (event.location != null) shell.setLocation(event.location); if (event.size != null) { Point size = event.size; shell.setSize(shell.computeSize(size.x, size.y)); } shell.open(); } }); browser.addCloseWindowListener(new CloseWindowListener() { public void close(WindowEvent event) { System.out.println("Close"); Browser browser = (Browser) event.widget; Shell shell = browser.getShell(); shell.close(); } }); } /** * Disposes of all resources associated with a particular instance of the * BrowserExample. */ public void dispose() { freeResources(); } /** * Frees the resources */ void freeResources() { if (images != null) { for (int i = 0; i < images.length; ++i) { final Image image = images[i]; if (image != null) image.dispose(); } images = null; } } /** * Grabs input focus. */ public void setFocus() { location.setFocus(); } public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); shell.setText("Browser example"); BrowserExample instance = new BrowserExample(shell); Image icon = new Image(display, "java2s.gif"); shell.setImage(icon); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } icon.dispose(); instance.dispose(); display.dispose(); } }