org.semanticsoft.vaaclipse.presentation.renderers.PlaceholderRenderer.java Source code

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Here is the source code for org.semanticsoft.vaaclipse.presentation.renderers.PlaceholderRenderer.java

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/*******************************************************************************
 * Copyright (c) 2012 Rushan R. Gilmullin and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Rushan R. Gilmullin - initial API and implementation
 *******************************************************************************/

package org.semanticsoft.vaaclipse.presentation.renderers;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;

import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.model.application.ui.MContext;
import org.eclipse.e4.ui.model.application.ui.MElementContainer;
import org.eclipse.e4.ui.model.application.ui.MUIElement;
import org.eclipse.e4.ui.model.application.ui.advanced.MPlaceholder;
import org.eclipse.e4.ui.model.application.ui.basic.MPartStack;
import org.eclipse.e4.ui.workbench.IPresentationEngine;
import org.eclipse.e4.ui.workbench.UIEvents;
import org.eclipse.e4.ui.workbench.UIEvents.EventTags;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
import org.semanticsoft.vaaclipse.presentation.utils.HierarchyUtils;
import org.semanticsoft.vaaclipse.widgets.ExtendedVerticalLayout;
import org.semanticsoft.vaaclipse.widgets.StackWidget;

import com.vaadin.ui.Component;
import com.vaadin.ui.VerticalLayout;

/**
 * @author rushan
 *
 */
public class PlaceholderRenderer extends VaadinRenderer {
    @Inject
    IPresentationEngine renderingEngine;

    @Inject
    private IEventBroker eventBroker;

    @Override
    public void createWidget(MUIElement element, MElementContainer<MUIElement> parent) {
        MPlaceholder ph = (MPlaceholder) element;
        final MUIElement ref = ph.getRef();
        ref.setCurSharedRef(ph);

        VerticalLayout phComp = new VerticalLayout();
        //ExtendedVerticalLayout phComp = new ExtendedVerticalLayout();
        phComp.setSizeFull();
        phComp.setMargin(false);
        ph.setWidget(phComp);

        Component refWidget = (Component) ref.getWidget();
        if (refWidget == null) {
            ref.setToBeRendered(true);
            refWidget = (Component) renderingEngine.createGui(ref);
        }

        if (refWidget.getParent() != phComp) {
            phComp.addComponent(refWidget);
        }

        if (ref instanceof MContext) {
            IEclipseContext context = ((MContext) ref).getContext();
            IEclipseContext newParentContext = getContext(ph);
            if (context.getParent() != newParentContext) {
                context.setParent(newParentContext);
            }
        }
    }

    EventHandler tagListener = new EventHandler() {
        @Override
        public void handleEvent(Event event) {
            Object changedObj = event.getProperty(EventTags.ELEMENT);
            String eventType = (String) event.getProperty(UIEvents.EventTags.TYPE);
            String tag = (String) event.getProperty(UIEvents.EventTags.NEW_VALUE);

            if (!(changedObj instanceof MPlaceholder)) {
                return;
            }

            final MPlaceholder ph = (MPlaceholder) changedObj;
            MPartStack topLeftStack = HierarchyUtils.findTopLeftFolder(ph.getRef());
            if (topLeftStack != null) {
                StackWidget stackWidget = (StackWidget) topLeftStack.getWidget();

                if (UIEvents.EventTypes.ADD.equals(eventType)) {
                    if (IPresentationEngine.MINIMIZED.equals(tag)) {
                        stackWidget.setState(-1);
                    } else if (IPresentationEngine.MAXIMIZED.equals(tag)) {
                        stackWidget.setState(1);
                    }
                } else if (UIEvents.EventTypes.REMOVE.equals(eventType)) {
                    stackWidget.setState(0);
                }
            }
        }
    };

    @PostConstruct
    void postConstruct() {
        eventBroker.subscribe(UIEvents.ApplicationElement.TOPIC_TAGS, tagListener);
    }

    @PreDestroy
    void preDestroy() {
        eventBroker.unsubscribe(tagListener);
    }
}