org.eclipse.scada.vi.details.swt.widgets.BrowserComponent.java Source code

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Here is the source code for org.eclipse.scada.vi.details.swt.widgets.BrowserComponent.java

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/*******************************************************************************
 * Copyright (c) 2014 IBH SYSTEMS GmbH 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:
 *     IBH SYSTEMS GmbH - initial API and implementation
 *******************************************************************************/
package org.eclipse.scada.vi.details.swt.widgets;

import java.util.Map;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.scada.vi.data.DataValue;
import org.eclipse.scada.vi.data.SummaryInformation;
import org.eclipse.scada.vi.details.swt.data.DataItemDescriptor;
import org.eclipse.scada.vi.details.swt.widgets.control.ControlImage;
import org.eclipse.swt.SWT;
import org.eclipse.swt.browser.Browser;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class BrowserComponent extends GenericComposite {
    private static final Logger logger = LoggerFactory.getLogger(BrowserComponent.class);

    private final org.eclipse.scada.vi.details.model.BrowserComponent component;

    private final Browser browser;

    private final LocalResourceManager resourceManager;

    private String currentUrl;

    private Image currentImage;

    private final ControlImage controlImage;

    public BrowserComponent(final Composite parent, final int style, final DataItemDescriptor descriptor,
            final org.eclipse.scada.vi.details.model.BrowserComponent component) {
        super(parent, style, null, null);
        this.component = component;

        final GridLayout layout = new GridLayout(2, false);
        layout.marginHeight = layout.marginWidth = 3;
        layout.horizontalSpacing = layout.verticalSpacing = 3;

        setLayout(layout);

        this.resourceManager = new LocalResourceManager(JFaceResources.getResources());

        this.controlImage = new ControlImage(this, this.registrationManager);

        this.browser = new Browser(this, SWT.NONE);

        final GridData gd = new GridData(SWT.CENTER, SWT.CENTER, true, true);
        if (component.getHeight() != null && component.getWidth() != null) {
            gd.minimumHeight = component.getHeight();
            gd.minimumWidth = component.getWidth();
            // this.label.setLayoutData ( new GridData ( component.getWidth (), component.getHeight () ) );
            this.browser.setSize(component.getWidth(), component.getHeight());
        }
        this.browser.setLayoutData(gd);

        if (descriptor != null) {
            this.controlImage.setDetailItem(descriptor.asItem());
            this.registrationManager.registerItem("value", descriptor.getItemId(),
                    descriptor.getConnectionInformation(), false, false);
        }

        showUrl(makeUrl());
        if (component.getReloadTimer() != null && component.getReloadTimer() > 0) {
            triggerReload(component.getReloadTimer());
        }
    }

    private void triggerReload(final long delay) {
        if (this.browser.isDisposed()) {
            return;
        }
        if (this.browser.getDisplay().isDisposed()) {
            return;
        }

        this.browser.getDisplay().timerExec((int) delay, new Runnable() {

            @Override
            public void run() {
                if (!BrowserComponent.this.browser.isDisposed()) {
                    reload();
                    triggerReload(delay);
                }
            }
        });
    }

    private String makeUrl() {
        if (this.component.getUrl() == null) {
            return "about:blank";
        }

        return this.component.getUrl();
    }

    @Override
    protected void handleDispose() {
        if (this.currentImage != null) {
            this.currentImage.dispose();
            this.currentImage = null;
        }

        this.resourceManager.dispose();
    }

    @Override
    protected void updateState(final Map<String, DataValue> values, final SummaryInformation aggregatedState) {
        if (isDisposed()) {
            logger.info("No updateView cause widget is disposed"); //$NON-NLS-1$
            return;
        }

        showUrl(makeUrl());
    }

    protected void showUrl(final String url) {
        logger.debug("Requesting URL: {}", url);

        synchronized (this) {
            if (this.currentUrl != null && this.currentUrl.equals(url)) {
                logger.debug("URL did not change");
                return;
            }

            this.currentUrl = url;
            this.browser.setUrl(this.currentUrl);
        }
    }

    public void reload() {
        this.browser.refresh();
    }

}