org.eclipse.swt.snippets.Snippet372.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet372.java
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/*******************************************************************************
 * Copyright (c) 2018 Red Hat Inc. 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:
 *     Lucas Bullen (Red Hat Inc.) - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Browser: Resize the shell to the fit the html content after it's loaded.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 4.8
 */
import org.eclipse.swt.*;
import org.eclipse.swt.browser.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet372 {
    static Double width = null;

    public static void main(String[] args) {
        int maximumWidth = 200;
        int maximumHeight = 2000;

        String html = "<HTML><HEAD><TITLE>HTML Test</TITLE></HEAD><BODY>";
        for (int i = 0; i < 15; i++)
            html += "<P>This is line " + i + "</P>";
        html += "</BODY></HTML>";

        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 372");
        shell.setLayout(new FillLayout());
        Browser browser;
        try {
            browser = new Browser(shell, SWT.NONE);
        } catch (SWTError e) {
            System.out.println("Could not instantiate Browser: " + e.getMessage());
            display.dispose();
            return;
        }
        browser.setText(html);
        browser.addProgressListener(ProgressListener.completedAdapter(event -> {
            // Set the display to something known to be smaller than the content
            shell.setSize(50, 50);
            browser.execute("document.getElementsByTagName(\"html\")[0].style.whiteSpace = \"nowrap\""); //$NON-NLS-1$
            // Save the width to either be a decided maximum or the browser's content width plus the margin
            Double width = Math.min(maximumWidth,
                    10 + (Double) browser.evaluate("return document.body.scrollWidth;")); //$NON-NLS-1$
            shell.setSize(width.intValue(), 0);
            browser.execute("document.getElementsByTagName(\"html\")[0].style.whiteSpace = \"normal\""); //$NON-NLS-1$
            shell.layout();
            // Set the height to either be a decided maximum or the browser's content height plus the margin
            Double height = Math.min(maximumHeight,
                    5 + (Double) browser.evaluate("return document.body.scrollHeight;")); //$NON-NLS-1$
            shell.setSize(width.intValue(), height.intValue());
        }));

        shell.open();
        while (!shell.isDisposed()) {
            shell.layout();
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}