ru.ksu.niimm.cll.mocassin.frontend.viewer.client.StructureViewer.java Source code

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Here is the source code for ru.ksu.niimm.cll.mocassin.frontend.viewer.client.StructureViewer.java

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/*******************************************************************************
 * Copyright (c) 2010-2012 Nikita Zhiltsov.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 * 
 * Contributors:
 *     Nikita Zhiltsov - initial API and implementation
 *     Azat Khasanshin - implementation
 ******************************************************************************/
package ru.ksu.niimm.cll.mocassin.frontend.viewer.client;

import java.util.List;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.Window.Location;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.CaptionPanel;
import com.google.gwt.user.client.ui.Frame;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootLayoutPanel;
import com.google.gwt.user.client.ui.ScrollPanel;
import com.google.gwt.user.client.ui.VerticalPanel;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class StructureViewer implements EntryPoint, NavigationEventHandler {
    interface Binder extends UiBinder<ScrollPanel, StructureViewer> {
    }

    private static final Binder binder = GWT.create(Binder.class);
    private final ViewerServiceAsync viewerService = GWT.create(ViewerService.class);

    private ViewerConstants constants = GWT.create(ViewerConstants.class);
    @UiField
    Frame frame;
    @UiField
    CaptionPanel metadataCaptionPanel;
    @UiField
    DocumentStructureGraphPanel documentStructureGraphPanel;

    private String currentArxivId;

    public void onModuleLoad() {
        ScrollPanel outer = binder.createAndBindUi(this);
        RootLayoutPanel root = RootLayoutPanel.get();
        root.add(outer);
        root.forceLayout();

        String resourceUri = Location.getParameter("resourceuri");
        if (resourceUri == null)
            return;

        App.eventBus.addHandler(NavigationEvent.TYPE, this);

        metadataCaptionPanel.setCaptionText(constants.metadataPanelTitle());

        viewerService.load(resourceUri, new LoadMetadataCallback());

    }

    private class LoadMetadataCallback implements AsyncCallback<ArticleInfo> {

        @Override
        public void onFailure(Throwable caught) {
            Window.alert("couldn't load the metadata: " + caught.getMessage());

        }

        @Override
        public void onSuccess(ArticleInfo result) {
            currentArxivId = result.getKey();
            VerticalPanel metadataPanel = new VerticalPanel();
            metadataPanel.setSpacing(5);

            metadataPanel.setSize("100%", "180");

            String key = currentArxivId != null ? currentArxivId : "";
            Label lblNewLabel = new Label("Article id: " + key);
            lblNewLabel.setStyleName("paper-id");
            metadataPanel.add(lblNewLabel);

            Label lblNewLabel_1 = new Label(result.getTitle());
            lblNewLabel_1.setStyleName("paper-title");
            metadataPanel.add(lblNewLabel_1);

            List<String> authors = result.getAuthors();
            for (String authorName : authors) {
                Label lblNewLabel_2 = new Label(authorName);
                lblNewLabel_2.setStyleName("paper-author");
                metadataPanel.add(lblNewLabel_2);
            }

            int currentPageNumber = result.getCurrentPageNumber() > 0 ? result.getCurrentPageNumber() - 1 : 0;

            String currentSegmentUri = result.getCurrentSegmentUri();
            String url = assembleUrl(currentSegmentUri, currentPageNumber);
            refreshFrame(url);

            metadataCaptionPanel.add(metadataPanel);
            documentStructureGraphPanel.refresh(result);
        }
    }

    private String assembleUrl(String currentSegmentUri, int currentPageNumber) {
        String url = "http://docs.google.com/viewer?url=http://cll.niimm.ksu.ru/mocassin/"
                + "mocassin/download/arxivid/" + currentArxivId
                + (currentSegmentUri != null
                        ? "$" + currentSegmentUri.substring(currentSegmentUri.lastIndexOf("/") + 1)
                        : "")
                + "&embedded=true#:0.page." + currentPageNumber;
        return url;
    }

    @Override
    public void onChange(final NavigationEvent navEvent) {
        refreshFrame(assembleUrl(navEvent.getCurrentUri(), navEvent.getNumPage()));
    }

    private void refreshFrame(final String url) {
        frame.setUrl(url);
        // using Timer is a workaround to refresh the frame
        Timer timer = new Timer() {
            @Override
            public void run() {
                frame.setUrl(url);
                cancel();
            }
        };
        timer.schedule(3000);
    }
}