es.deusto.weblab.client.ui.widgets.WlWebcamSafariBased.java Source code

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Here is the source code for es.deusto.weblab.client.ui.widgets.WlWebcamSafariBased.java

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/*
* Copyright (C) 2005 onwards University of Deusto
* All rights reserved.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution.
*
* This software consists of contributions made by many individuals, 
* listed below:
*
* Author: Pablo Ordua <pablo@ordunya.com>
*
*/
package es.deusto.weblab.client.ui.widgets;

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Vector;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Element;
import com.google.gwt.user.client.ui.Anchor;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.HasHorizontalAlignment;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Widget;

public class WlWebcamSafariBased extends WlWebcam {

    private static enum WebcamFormat {
        jpeg, mjpeg
    }

    private static Map<WebcamFormat, String> NAMES = new HashMap<WebcamFormat, String>();

    static {
        NAMES.put(WebcamFormat.jpeg, "jpg");
        NAMES.put(WebcamFormat.mjpeg, "video (mjpeg)");

        if (NAMES.size() != WebcamFormat.values().length)
            System.err.println("Error: missing value for " + WebcamFormat.class.getName());
    }

    private WebcamFormat currentWebcam = WebcamFormat.jpeg;
    private WebcamFormat lastWebcam = WebcamFormat.jpeg;
    private final HorizontalPanel choicePanel;

    public WlWebcamSafariBased() {
        this(WlWebcam.DEFAULT_REFRESH_TIME, WlWebcam.DEFAULT_IMAGE_URL);
    }

    public WlWebcamSafariBased(int time) {
        this(time, WlWebcam.DEFAULT_IMAGE_URL);
    }

    public WlWebcamSafariBased(int time, String url) {
        this(time, url, WlWebcam.DEFAULT_IMAGE_URL);
    }

    public WlWebcamSafariBased(int time, String url, String streamingUrl) {
        super(time, url, streamingUrl);

        this.choicePanel = new HorizontalPanel();
        this.choicePanel.setWidth("160px");
        this.choicePanel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);
        this.add(this.choicePanel);
    }

    @Override
    public void dispose() {
        this.running = false;

        if (this.timer != null)
            this.timer.cancel();

        this.timer = null;
    }

    @Override
    public void setVisible(boolean visible) {
        super.setVisible(visible);
        this.image.setVisible(visible);
    }

    @Override
    public void reload() {
        if (this.running) {
            switch (this.currentWebcam) {
            case jpeg:
                ensureJpeg();
                reloadJpeg();
                break;
            case mjpeg:
                reloadMJpeg();
                break;
            }
            this.lastWebcam = this.currentWebcam;
        }
    }

    private void ensureJpeg() {
        if (this.lastWebcam != WebcamFormat.jpeg) {
            this.imagePanel.clear();
            this.image = new Image();
            this.imagePanel.add(this.image);
        }
    }

    private void reloadMJpeg() {
        if (this.lastWebcam != WebcamFormat.mjpeg) {
            this.imagePanel.clear();
            final HTML html = new HTML();
            html.setHTML("<div/>");
            this.imagePanel.add(html);
            createJavaScriptCode(html.getElement(), this.streamingWidth, this.streamingHeight, this.streamingUrl);
            System.out.println(html.getHTML());
        }
    }

    private static native void createJavaScriptCode(Element element, int width, int height, String imageUrl) /*-{
                                                                                                             var iFrameHtml   = "<iframe name=\"wlframe\" frameborder=\"0\"  vspace=\"0\"  hspace=\"0\"  marginwidth=\"0\"  marginheight=\"0\" " +
                                                                                                             "width=\"" + width + "\"  scrolling=\"no\"  height=\"" + height + "\" " +
                                                                                                             "></iframe>";
                                                                                                             element.innerHTML = iFrameHtml;
                                                                                                             var wl_iframe    = element.getElementsByTagName('iframe')[0];
                                                                                                                 
                                                                                                             var doc = wl_iframe.contentDocument;
                                                                                                             if (doc == undefined || doc == null)
                                                                                                             doc = wl_iframe.contentWindow.document;
                                                                                                                 
                                                                                                             var completeHtml = "<html>" +
                                                                                                             "<head></head>" +
                                                                                                             "<body><img id=\"webcam\" src=\"" + imageUrl + "\"/></body>" +
                                                                                                             "</html>";
                                                                                                             doc.open();
                                                                                                             doc.write(completeHtml);
                                                                                                             doc.close();
                                                                                                             }-*/;

    @Override
    protected void reloadPanel() {
        reloadPanel(null);
    }

    private void reloadPanel(WebcamFormat format) {
        final List<WebcamFormat> possibleFormats = new Vector<WebcamFormat>();
        if (this.url != DEFAULT_IMAGE_URL) {
            possibleFormats.add(WebcamFormat.jpeg);
        }
        if (this.streamingUrl != DEFAULT_IMAGE_URL) {
            possibleFormats.add(WebcamFormat.mjpeg);
        }

        if (format != null)
            this.currentWebcam = format;
        else if (possibleFormats.size() > 0)
            this.currentWebcam = possibleFormats.get(0);

        this.choicePanel.clear();
        if (possibleFormats.size() > 1) {
            for (final WebcamFormat webcam : possibleFormats) {
                final Widget anchor;
                if (webcam.equals(this.currentWebcam)) {
                    anchor = new HTML("<b>" + NAMES.get(webcam) + "</b>");
                } else {
                    anchor = new Anchor(NAMES.get(webcam));
                    ((Anchor) anchor).addClickHandler(new ClickHandler() {
                        @Override
                        public void onClick(ClickEvent event) {
                            reloadPanel(webcam);
                        }
                    });
                }
                this.choicePanel.add(anchor);
            }
        }
        reload();
        if (this.image.getWidth() > 0)
            this.choicePanel.setWidth((this.image.getWidth() / 2) + "px");
    }
}