Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2017 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.swt.examples.browserexample; import java.io.IOException; import java.io.InputStream; import java.util.MissingResourceException; import java.util.ResourceBundle; import org.eclipse.swt.SWT; import org.eclipse.swt.SWTError; import org.eclipse.swt.browser.Browser; import org.eclipse.swt.browser.LocationListener; import org.eclipse.swt.browser.ProgressEvent; import org.eclipse.swt.browser.ProgressListener; import org.eclipse.swt.browser.VisibilityWindowListener; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.graphics.ImageData; 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.Control; import org.eclipse.swt.widgets.Display; 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[]; Image icon = null; boolean title = false; Composite parent; Text locationBar; Browser browser; ToolBar toolbar; Canvas canvas; ToolItem itemBack, itemForward; Label status; ProgressBar progressBar; SWTError error = null; 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 = "document.gif"; public BrowserExample(Composite parent, boolean top) { this.parent = parent; try { browser = new Browser(parent, SWT.BORDER); } catch (SWTError e) { error = e; /* Browser widget could not be instantiated */ parent.setLayout(new FillLayout()); Label label = new Label(parent, SWT.CENTER | SWT.WRAP); label.setText(getResourceString("BrowserNotCreated")); label.requestLayout(); return; } initResources(); final Display display = parent.getDisplay(); browser.setData("org.eclipse.swt.examples.browserexample.BrowserApplication", this); browser.addOpenWindowListener(event -> { Shell shell = new Shell(display); if (icon != null) shell.setImage(icon); shell.setLayout(new FillLayout()); BrowserExample app = new BrowserExample(shell, false); app.setShellDecoration(icon, true); event.browser = app.getBrowser(); }); if (top) { browser.setUrl(getResourceString("Startup")); show(false, null, null, true, true, true, true); } else { browser.addVisibilityWindowListener(VisibilityWindowListener.showAdapter(e -> { Browser browser = (Browser) e.widget; BrowserExample app = (BrowserExample) browser .getData("org.eclipse.swt.examples.browserexample.BrowserApplication"); app.show(true, e.location, e.size, e.addressBar, e.menuBar, e.statusBar, e.toolBar); })); browser.addCloseWindowListener(event -> { Browser browser = (Browser) event.widget; Shell shell = browser.getShell(); shell.close(); }); } } /** * Disposes of all resources associated with a particular * instance of the BrowserApplication. */ public void dispose() { freeResources(); } /** * 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 resourceBundle.getString(key); } catch (MissingResourceException e) { return key; } catch (NullPointerException e) { return "!" + key + "!"; } } public SWTError getError() { return error; } public Browser getBrowser() { return browser; } public void setShellDecoration(Image icon, boolean title) { this.icon = icon; this.title = title; } void show(boolean owned, Point location, Point size, boolean addressBar, boolean menuBar, boolean statusBar, boolean toolBar) { final Shell shell = browser.getShell(); if (owned) { if (location != null) shell.setLocation(location); if (size != null) shell.setSize(shell.computeSize(size.x, size.y)); } FormData data = null; if (toolBar) { toolbar = new ToolBar(parent, SWT.NONE); data = new FormData(); data.top = new FormAttachment(0, 5); toolbar.setLayoutData(data); itemBack = new ToolItem(toolbar, SWT.PUSH); itemBack.setText(getResourceString("Back")); 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")); itemBack.setEnabled(browser.isBackEnabled()); itemForward.setEnabled(browser.isForwardEnabled()); Listener listener = 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(locationBar.getText()); }; 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); canvas = new Canvas(parent, SWT.NO_BACKGROUND); data = new FormData(); data.width = 24; data.height = 24; data.top = new FormAttachment(0, 5); data.right = new FormAttachment(100, -5); canvas.setLayoutData(data); final Rectangle rect = images[0].getBounds(); canvas.addListener(SWT.Paint, e -> { Point pt = ((Canvas) e.widget).getSize(); e.gc.drawImage(images[index], 0, 0, rect.width, rect.height, 0, 0, pt.x, pt.y); }); canvas.addListener(SWT.MouseDown, e -> browser.setUrl(getResourceString("Startup"))); final Display display = parent.getDisplay(); display.asyncExec(new Runnable() { @Override public void run() { if (canvas.isDisposed()) return; if (busy) { index++; if (index == images.length) index = 0; canvas.redraw(); } display.timerExec(150, this); } }); } if (addressBar) { locationBar = new Text(parent, SWT.BORDER); data = new FormData(); if (toolbar != null) { data.top = new FormAttachment(toolbar, 0, SWT.TOP); data.left = new FormAttachment(toolbar, 5, SWT.RIGHT); data.right = new FormAttachment(canvas, -5, SWT.DEFAULT); } else { data.top = new FormAttachment(0, 0); data.left = new FormAttachment(0, 0); data.right = new FormAttachment(100, 0); } locationBar.setLayoutData(data); locationBar.addListener(SWT.DefaultSelection, e -> browser.setUrl(locationBar.getText())); } if (statusBar) { status = new Label(parent, SWT.NONE); progressBar = new ProgressBar(parent, SWT.NONE); 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); browser.addStatusTextListener(event -> status.setText(event.text)); } parent.setLayout(new FormLayout()); Control aboveBrowser = toolBar ? (Control) canvas : (addressBar ? (Control) locationBar : null); data = new FormData(); data.left = new FormAttachment(0, 0); data.top = aboveBrowser != null ? new FormAttachment(aboveBrowser, 5, SWT.DEFAULT) : new FormAttachment(0, 0); data.right = new FormAttachment(100, 0); data.bottom = status != null ? new FormAttachment(status, -5, SWT.DEFAULT) : new FormAttachment(100, 0); browser.setLayoutData(data); if (statusBar || toolBar) { browser.addProgressListener(new ProgressListener() { @Override public void changed(ProgressEvent event) { if (event.total == 0) return; int ratio = event.current * 100 / event.total; if (progressBar != null) progressBar.setSelection(ratio); busy = event.current != event.total; if (!busy) { index = 0; if (canvas != null) canvas.redraw(); } } @Override public void completed(ProgressEvent event) { if (progressBar != null) progressBar.setSelection(0); busy = false; index = 0; if (canvas != null) { itemBack.setEnabled(browser.isBackEnabled()); itemForward.setEnabled(browser.isForwardEnabled()); canvas.redraw(); } } }); } if (addressBar || statusBar || toolBar) { browser.addLocationListener(LocationListener.changedAdapter(event -> { busy = true; if (event.top && locationBar != null) locationBar.setText(event.location); })); } if (title) { browser.addTitleListener( event -> shell.setText(event.title + " - " + getResourceString("window.title"))); } parent.layout(true); if (owned) shell.open(); } /** * Grabs input focus */ public void focus() { if (locationBar != null) locationBar.setFocus(); else if (browser != null) browser.setFocus(); else parent.setFocus(); } /** * Frees the resources */ void freeResources() { if (images != null) { for (final Image image : images) { if (image != null) image.dispose(); } images = null; } } /** * Loads the resources */ void initResources() { final Class<? extends BrowserExample> clazz = this.getClass(); if (resourceBundle != null) { try { if (images == null) { images = new Image[imageLocations.length]; for (int i = 0; i < imageLocations.length; ++i) { try (InputStream sourceStream = clazz.getResourceAsStream(imageLocations[i])) { ImageData source = new ImageData(sourceStream); ImageData mask = source.getTransparencyMask(); images[i] = new Image(null, source, mask); } } } return; } catch (Throwable t) { } } String error = (resourceBundle != null) ? getResourceString("error.CouldNotLoadResources") : "Unable to load resources"; freeResources(); throw new RuntimeException(error); } public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); shell.setText(getResourceString("window.title")); InputStream stream = BrowserExample.class.getResourceAsStream(iconLocation); Image icon = new Image(display, stream); shell.setImage(icon); try { stream.close(); } catch (IOException e) { e.printStackTrace(); } BrowserExample app = new BrowserExample(shell, true); app.setShellDecoration(icon, true); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } icon.dispose(); app.dispose(); display.dispose(); } }