snippet128.java

对于可视的桌面开发系统的一些详细的设计资料

/*******************************************************************************
 * 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
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Browser example snippet: bring up a browser
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.0
 */
import org.eclipse.swt.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.browser.*;

public class Snippet128 {
	public static void main(String [] args) {
		Display display = new Display();
		final Shell shell = new Shell(display);
		GridLayout gridLayout = new GridLayout();
		gridLayout.numColumns = 3;
		shell.setLayout(gridLayout);
		ToolBar toolbar = new ToolBar(shell, SWT.NONE);
		ToolItem itemBack = new ToolItem(toolbar, SWT.PUSH);
		itemBack.setText("Back");
		ToolItem itemForward = new ToolItem(toolbar, SWT.PUSH);
		itemForward.setText("Forward");
		ToolItem itemStop = new ToolItem(toolbar, SWT.PUSH);
		itemStop.setText("Stop");
		ToolItem itemRefresh = new ToolItem(toolbar, SWT.PUSH);
		itemRefresh.setText("Refresh");
		ToolItem itemGo = new ToolItem(toolbar, SWT.PUSH);
		itemGo.setText("Go");
		
		GridData data = new GridData();
		data.horizontalSpan = 3;
		toolbar.setLayoutData(data);

		Label labelAddress = new Label(shell, SWT.NONE);
		labelAddress.setText("Address");
		
		final Text location = new Text(shell, SWT.BORDER);
		data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		data.horizontalSpan = 2;
		data.grabExcessHorizontalSpace = true;
		location.setLayoutData(data);

		final Browser browser;
		try {
			browser = new Browser(shell, SWT.NONE);
		} catch (SWTError e) {
			System.out.println("Could not instantiate Browser: " + e.getMessage());
			return;
		}
		data = new GridData();
		data.horizontalAlignment = GridData.FILL;
		data.verticalAlignment = GridData.FILL;
		data.horizontalSpan = 3;
		data.grabExcessHorizontalSpace = true;
		data.grabExcessVerticalSpace = true;
		browser.setLayoutData(data);

		final Label status = new Label(shell, SWT.NONE);
		data = new GridData(GridData.FILL_HORIZONTAL);
		data.horizontalSpan = 2;
		status.setLayoutData(data);

		final ProgressBar progressBar = new ProgressBar(shell, SWT.NONE);
		data = new GridData();
		data.horizontalAlignment = GridData.END;
		progressBar.setLayoutData(data);

		/* event handling */
		Listener listener = new Listener() {
			public void handleEvent(Event event) {
				ToolItem item = (ToolItem)event.widget;
				String string = item.getText();
				if (string.equals("Back")) browser.back(); 
				else if (string.equals("Forward")) browser.forward();
				else if (string.equals("Stop")) browser.stop();
				else if (string.equals("Refresh")) browser.refresh();
				else if (string.equals("Go")) browser.setUrl(location.getText());
		   }
		};
		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.addStatusTextListener(new StatusTextListener() {
			public void changed(StatusTextEvent event) {
				status.setText(event.text);	
			}
		});
		browser.addLocationListener(new LocationListener() {
			public void changed(LocationEvent event) {
				if (event.top) location.setText(event.location);
			}
			public void changing(LocationEvent event) {
			}
		});
		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());
			}
		});
		
		shell.open();
		browser.setUrl("http://eclipse.org");
		
		while (!shell.isDisposed()) {
			if (!display.readAndDispatch())
				display.sleep();
		}
		display.dispose();
	}
}