org.lunifera.runtime.web.ecview.presentation.vaadin.internal.LabelPresentation.java Source code

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Here is the source code for org.lunifera.runtime.web.ecview.presentation.vaadin.internal.LabelPresentation.java

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/**
 * Copyright (c) 2011 - 2014, Lunifera GmbH (Gross Enzersdorf), Loetz KG (Heidelberg)
 * 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: 
 *       Florian Pirchner - Initial implementation
 */
package org.lunifera.runtime.web.ecview.presentation.vaadin.internal;

import java.util.Locale;

import org.eclipse.emf.ecp.ecview.common.context.II18nService;
import org.eclipse.emf.ecp.ecview.common.editpart.IElementEditpart;
import org.eclipse.emf.ecp.ecview.extension.model.extension.YLabel;
import org.eclipse.emf.ecp.ecview.ui.core.editparts.extension.ILabelEditpart;

import com.vaadin.data.util.ObjectProperty;
import com.vaadin.ui.Component;
import com.vaadin.ui.ComponentContainer;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.Label;

/**
 * This presenter is responsible to render a text field on the given layout.
 */
public class LabelPresentation extends AbstractEmbeddedWidgetPresenter<Component> {

    private final ModelAccess modelAccess;
    private CssLayout componentBase;
    private Label label;
    private ObjectProperty<String> property;

    /**
     * Constructor.
     * 
     * @param editpart
     *            The editpart of that presenter
     */
    public LabelPresentation(IElementEditpart editpart) {
        super((ILabelEditpart) editpart);
        this.modelAccess = new ModelAccess((YLabel) editpart.getModel());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Component doCreateWidget(Object parent) {
        if (componentBase == null) {
            componentBase = new CssLayout();
            componentBase.addStyleName(CSS_CLASS_CONTROL_BASE);
            if (modelAccess.isCssIdValid()) {
                componentBase.setId(modelAccess.getCssID());
            } else {
                componentBase.setId(getEditpart().getId());
            }

            associateWidget(componentBase, modelAccess.yLabel);

            label = new Label();
            label.addStyleName(CSS_CLASS_CONTROL);
            label.setImmediate(true);

            associateWidget(label, modelAccess.yLabel);

            property = new ObjectProperty<String>("", String.class);
            label.setPropertyDataSource(property);

            // creates the binding for the field
            createBindings(modelAccess.yLabel, label, null);

            componentBase.addComponent(label);

            if (modelAccess.isCssClassValid()) {
                label.addStyleName(modelAccess.getCssClass());
            }

            applyCaptions();
        }
        return componentBase;
    }

    @Override
    protected void doUpdateLocale(Locale locale) {
        // no need to set the locale to the ui elements. Is handled by vaadin
        // internally.

        // update the captions
        applyCaptions();
    }

    /**
     * Applies the labels to the widgets.
     */
    protected void applyCaptions() {
        II18nService service = getI18nService();
        if (service != null && modelAccess.isLabelI18nKeyValid()) {
            componentBase.setCaption(service.getValue(modelAccess.getLabelI18nKey(), getLocale()));
        } else {
            if (modelAccess.isLabelValid()) {
                componentBase.setCaption(modelAccess.getLabel());
            }
        }
    }

    @Override
    public Component getWidget() {
        return componentBase;
    }

    @Override
    public boolean isRendered() {
        return componentBase != null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void doUnrender() {
        if (componentBase != null) {

            // unbind all active bindings
            unbind();

            ComponentContainer parent = ((ComponentContainer) componentBase.getParent());
            if (parent != null) {
                parent.removeComponent(componentBase);
            }

            // remove assocations
            unassociateWidget(componentBase);
            unassociateWidget(label);

            componentBase = null;
            label = null;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void internalDispose() {
        try {
            unrender();
        } finally {
            super.internalDispose();
        }
    }

    /**
     * A helper class.
     */
    private static class ModelAccess {
        private final YLabel yLabel;

        public ModelAccess(YLabel yLabel) {
            super();
            this.yLabel = yLabel;
        }

        /**
         * @return
         * @see org.eclipse.emf.ecp.ecview.ui.core.model.core.YCssAble#getCssClass()
         */
        public String getCssClass() {
            return yLabel.getCssClass();
        }

        /**
         * Returns true, if the css class is not null and not empty.
         * 
         * @return
         */
        public boolean isCssClassValid() {
            return getCssClass() != null && !getCssClass().equals("");
        }

        /**
         * @return
         * @see org.eclipse.emf.ecp.ecview.ui.core.model.core.YCssAble#getCssID()
         */
        public String getCssID() {
            return yLabel.getCssID();
        }

        /**
         * Returns true, if the css id is not null and not empty.
         * 
         * @return
         */
        public boolean isCssIdValid() {
            return getCssID() != null && !getCssID().equals("");
        }

        /**
         * Returns true, if the label is valid.
         * 
         * @return
         */
        public boolean isLabelValid() {
            return yLabel.getDatadescription() != null && yLabel.getDatadescription().getLabel() != null;
        }

        /**
         * Returns the label.
         * 
         * @return
         */
        public String getLabel() {
            return yLabel.getDatadescription().getLabel();
        }

        /**
         * Returns true, if the label is valid.
         * 
         * @return
         */
        public boolean isLabelI18nKeyValid() {
            return yLabel.getDatadescription() != null && yLabel.getDatadescription().getLabelI18nKey() != null;
        }

        /**
         * Returns the label.
         * 
         * @return
         */
        public String getLabelI18nKey() {
            return yLabel.getDatadescription().getLabelI18nKey();
        }
    }
}