GenericTopicView.java

package kornell.gui.client.presentation.classroom.generic.details;

import static kornell.core.util.StringUtils.mkurl;

import java.util.ArrayList;
import java.util.List;

import com.github.gwtbootstrap.client.ui.Collapse;
import com.github.gwtbootstrap.client.ui.CollapseTrigger;
import com.github.gwtbootstrap.client.ui.FluidRow;
import com.github.gwtbootstrap.client.ui.event.HideEvent;
import com.github.gwtbootstrap.client.ui.event.HideHandler;
import com.github.gwtbootstrap.client.ui.event.ShowEvent;
import com.github.gwtbootstrap.client.ui.event.ShowHandler;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.place.shared.PlaceController;
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.ui.Composite;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;
import com.google.web.bindery.event.shared.EventBus;

import kornell.api.client.KornellClient;
import kornell.api.client.KornellSession;
import kornell.core.entity.CourseClassState;
import kornell.core.entity.Enrollment;
import kornell.core.entity.EnrollmentState;
import kornell.core.lom.Content;
import kornell.core.lom.ContentFormat;
import kornell.core.lom.ExternalPage;
import kornell.core.lom.Topic;
import kornell.core.to.CourseClassTO;
import kornell.gui.client.util.ClientConstants;

public class GenericTopicView extends Composite {
	interface MyUiBinder extends UiBinder<Widget, GenericTopicView> {
	}

	private static MyUiBinder uiBinder = GWT.create(MyUiBinder.class);
	private PlaceController placeCtrl;
	private EventBus bus;
	private String IMAGES_PATH = mkurl(ClientConstants.IMAGES_PATH, "courseDetails");
	private Content content;
	private KornellSession session;
	private CourseClassTO currentCourse;
	private int index;
	private boolean enableAnchorOnFirstChild;
	
	@UiField
	CollapseTrigger trigger;
	@UiField
	FlowPanel topicWrapper;
	@UiField
	FlowPanel topicPanel;
	@UiField
	Image topicIcon;
	@UiField
	Label lblTopic;
	@UiField
	Collapse collapse;
	@UiField
	FluidRow childrenPanel;

	public GenericTopicView(EventBus eventBus, KornellClient client,
			PlaceController placeCtrl, KornellSession session,
			CourseClassTO currentCourse, Content content, int index, boolean enableAnchorOnFirstChild) {
		this.bus = eventBus;
		this.placeCtrl = placeCtrl;
		this.session = session;
		this.content = content;
		this.currentCourse = currentCourse;
		this.index = index;
		this.enableAnchorOnFirstChild = enableAnchorOnFirstChild;
		initWidget(uiBinder.createAndBindUi(this));
		
		collapse.addShowHandler(new ShowHandler() {
			@Override
			public void onShow(ShowEvent showEvent) {
				updateIconURL(true);
			}
		});
		collapse.addHideHandler(new HideHandler() {
			@Override
			public void onHide(HideEvent hideEvent) {
				updateIconURL(false);
			}
		});
		Timer timer = new Timer() {
			public void run() {
				display();
			}
		};
		timer.schedule(500);
	}
	
	public void show(final boolean show){
	    Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() {
	        @Override
	        public void execute() {
				if(show)
					collapse.show();
				else
					collapse.hide();
	        }
	    });
	}

	private void display() {
		trigger.setTarget("#toggle" + index);
		collapse.setId("toggle" + index);
		updateIconURL(false);
		
		String topicName = "???Topic???";
		Topic topic = content.getTopic();
		List<Content> children = new ArrayList<Content>();
		if (ContentFormat.Topic.equals(content.getFormat())) {			
			topicName = topic.getName();
			children = topic.getChildren();
		}
		lblTopic.setText(topicName);
			
		ExternalPage page;
		int childrenIndex = 0;
				 
		for (Content contentItem : children) {
			page = contentItem.getExternalPage();
			if (!page.getTitle().startsWith("###")) { // TODO MDA
				Enrollment enrollment = currentCourse != null? currentCourse.getEnrollment() : null;
				EnrollmentState state = enrollment != null ? enrollment.getState() : null;
				boolean enableAnchor = (page.isVisited()
							|| (childrenIndex == 0 && enableAnchorOnFirstChild))
						&& EnrollmentState.enrolled.equals(state)
						&& !CourseClassState.inactive.equals(currentCourse.getCourseClass().getState());
				childrenPanel.add(new GenericPageView(bus, session, placeCtrl, page, currentCourse, enableAnchor));
			}
			childrenIndex++;
		}

		if (childrenPanel.getWidgetCount() > 0) {
			this.addStyleName("cursorPointer");
		} else {
			topicIcon.addStyleName("shy");
			this.addStyleName("cursorDefault");
		}

		topicWrapper.removeStyleName("shy");
	}

	private void updateIconURL(boolean isOpened) {
		if(isOpened)
			topicIcon.setUrl(mkurl(IMAGES_PATH, "topic-expanded.png"));
		else
			topicIcon.setUrl(mkurl(IMAGES_PATH, "topic-contracted.png"));
	}
}