133 lines
3.9 KiB
Java
133 lines
3.9 KiB
Java
package org.gcube.portlets.user.topics.client.panel;
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import java.util.ArrayList;
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import org.gcube.portlets.user.topics.client.TopicService;
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import org.gcube.portlets.user.topics.client.TopicServiceAsync;
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import org.gcube.portlets.user.topics.shared.HashtagsWrapper;
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import com.github.gwtbootstrap.client.ui.Button;
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import com.google.gwt.core.client.GWT;
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import com.google.gwt.event.dom.client.ClickEvent;
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import com.google.gwt.event.dom.client.ClickHandler;
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import com.google.gwt.user.client.rpc.AsyncCallback;
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import com.google.gwt.user.client.ui.Composite;
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import com.google.gwt.user.client.ui.HTML;
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import com.google.gwt.user.client.ui.HasAlignment;
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import com.google.gwt.user.client.ui.HasVerticalAlignment;
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import com.google.gwt.user.client.ui.Image;
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import com.google.gwt.user.client.ui.VerticalPanel;
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/**
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*
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* @author Massimiliano Assante, ISTI-CNR
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*
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*/
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public class TopicsPanel extends Composite {
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/**
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* Create a remote service proxy to talk to the server-side Greeting service.
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*/
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private final TopicServiceAsync topicsService = GWT.create(TopicService.class);
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public static final String loading = GWT.getModuleBaseURL() + "../images/topics-loader.gif";
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public static final String DISPLAY_NAME = "Top Topics";
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public static final int THRESHOLD_SHOW_HASHTAGS = 10; // show the first X ones
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private static final String NO_TOP_TOPICS_MESSAGE = "No Topics Available";
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private Image loadingImage;
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private VerticalPanel mainPanel = new VerticalPanel();
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public TopicsPanel() {
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loadingImage = new Image(loading);
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initWidget(mainPanel);
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showLoader();
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topicsService.getHashtags(new AsyncCallback<HashtagsWrapper>() {
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@Override
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public void onSuccess(HashtagsWrapper result) {
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mainPanel.clear();
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mainPanel.setHorizontalAlignment(HasAlignment.ALIGN_LEFT);
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mainPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_TOP);
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ArrayList<String> hashtags = result.getHashtags();
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if (hashtags == null) {
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showServError();
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}
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else {
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int counter = 0;
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if (hashtags != null && !hashtags.isEmpty()) {
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for (String hashtag : hashtags) {
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counter ++;
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HTML toAdd = new HTML(hashtag);
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toAdd.addStyleName("hashtag-label");
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mainPanel.add(toAdd);
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if(counter > THRESHOLD_SHOW_HASHTAGS) // 11, 12...
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toAdd.setVisible(false);
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}
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// add a show all button if needed
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if(counter > THRESHOLD_SHOW_HASHTAGS){
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final Button showAllHashtags = new Button("Show All");
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showAllHashtags.addClickHandler(new ClickHandler() {
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@Override
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public void onClick(ClickEvent event) {
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int numberChildren = mainPanel.getWidgetCount();
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for (int i = THRESHOLD_SHOW_HASHTAGS; i < numberChildren; i++) {
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mainPanel.getWidget(i).setVisible(true);
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}
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// hide the button
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showAllHashtags.setVisible(false);
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}
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});
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mainPanel.add(showAllHashtags);
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}
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}else{
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mainPanel.add(new HTML(NO_TOP_TOPICS_MESSAGE));
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}
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}
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}
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@Override
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public void onFailure(Throwable caught) {
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showConnError();
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}
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});
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}
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private void showLoader() {
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mainPanel.clear();
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mainPanel.setWidth("100%");
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mainPanel.setHorizontalAlignment(HasAlignment.ALIGN_CENTER);
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mainPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);
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mainPanel.add(loadingImage);
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}
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private void showConnError() {
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mainPanel.clear();
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mainPanel.setHorizontalAlignment(HasAlignment.ALIGN_LEFT);
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mainPanel.setVerticalAlignment(HasVerticalAlignment.ALIGN_TOP);
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mainPanel.add(new HTML("<div class=\"nofeed-message\">" +
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"Sorry, looks like something is broken with the server connection<br> " +
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"Please check your connection and try refresh this page.</div>"));
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}
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private void showServError() {
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mainPanel.clear();
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mainPanel.add(new HTML("<div class=\"nofeed-message\">" +
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"Sorry, we have problems in our servers ...<br> " +
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"Please try in a while or report the issue.</div>"));
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}
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}
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