edu.caltech.ipac.firefly.ui.JSLoad.java Source code

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Here is the source code for edu.caltech.ipac.firefly.ui.JSLoad.java

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/*
 * License information at https://github.com/Caltech-IPAC/firefly/blob/master/License.txt
 */
package edu.caltech.ipac.firefly.ui;
/**
 * User: roby
 * Date: 6/10/11
 * Time: 1:47 PM
 */

import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.ScriptElement;
import com.google.gwt.user.client.Event;
import edu.caltech.ipac.firefly.util.BrowserUtil;

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

/**
 * @author Trey Roby
 */
public class JSLoad {

    private List<Loaded> _callbackList = new ArrayList<Loaded>(5);
    public Map<JavaScriptObject, Boolean> _map = new HashMap<JavaScriptObject, Boolean>(10);
    public boolean _allLoaded = false;

    public JSLoad(Loaded loaded, String... url) {
        _callbackList.add(loaded);
        Document document = Document.get();

        for (String u : url) {
            ScriptElement script = document.createScriptElement();
            script.setSrc(u);
            script.setType("text/javascript");
            _map.put(script, false);
            if (BrowserUtil.isIE() && BrowserUtil.getMajorVersion() < 9) {
                addIEListener(this, script, loaded);
            } else {
                addListener(this, script, loaded);
            }
            document.getBody().appendChild(script);
        }

    }

    public void addCallback(Loaded loaded) {
        if (!isAllLoaded()) {
            _callbackList.add(loaded);
        } else {
            loaded.allLoaded();
        }
    }

    //    public native static  void addIEListener(ScriptElement script, Loaded loaded) /*-{
    //        script.onreadystatechange= function() {
    //            GwtUtil.showDebugMsg("ie to not yet complete");
    //            if (this.readyState=='complete') {
    //                GwtUtil.showDebugMsg("ie to complete");
    //                loaded.@edu.caltech.ipac.firefly.ui.JSLoad.Loaded::allLoaded()();
    //            }
    //        }
    //
    //    }-*/;

    public native void addIEListener(JSLoad jsload, ScriptElement script, Loaded loaded) /*-{
                                                                                         var listener= @edu.caltech.ipac.firefly.ui.JSLoad::doneListenerStatic(Ledu/caltech/ipac/firefly/ui/JSLoad;Lcom/google/gwt/user/client/Event;);
                                                                                         script.attachEvent(
                                                                                         "onload",
                                                                                         $entry(
                                                                                         function(event) {
                                                                                         listener(jsload, event);
                                                                                         })
                                                                                         );
                                                                                         }-*/;

    public native void addListener(JSLoad jsload, ScriptElement script, Loaded loaded) /*-{
                                                                                       var listener= @edu.caltech.ipac.firefly.ui.JSLoad::doneListenerStatic(Ledu/caltech/ipac/firefly/ui/JSLoad;Lcom/google/gwt/user/client/Event;);
                                                                                       script.addEventListener(
                                                                                       "load",
                                                                                       $entry(
                                                                                       function(event) { listener(jsload, event); }),
                                                                                       false);
                                                                                       }-*/;

    public void doneListener(Event ev) {
        JavaScriptObject source = ev.getEventTarget();
        if (_map.containsKey(source) && ScriptElement.is(source)) {
            _map.put(source, true);
        } else {
            // some error here
        }
        if (isAllLoaded())
            allCompleteNotify();
    }

    public boolean isAllLoaded() {
        if (!_allLoaded) {
            _allLoaded = true;
            for (Boolean done : _map.values()) {
                _allLoaded = done;
                if (!_allLoaded)
                    break;
            }
        }
        return _allLoaded;
    }

    private void allCompleteNotify() {
        if (_map.size() > 0) {
            for (Loaded cb : _callbackList)
                cb.allLoaded();
        }

    }

    public static void doneListenerStatic(JSLoad jsload, Event ev) {
        jsload.doneListener(ev);
    }

    public interface Loaded {
        void allLoaded();
    }
}