UiStackLayoutPanelTagFactory.java

package com.googlecode.gwt.test.uibinder.widget;

import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NodeList;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.StackLayoutPanel;
import com.googlecode.gwt.test.uibinder.UiBinderXmlUtils;
import com.googlecode.gwt.test.uibinder.UiObjectTag;
import com.googlecode.gwt.test.uibinder.UiObjectTagFactory;

import java.util.List;
import java.util.Map;

/**
 * Handles <g:StackLayoutPanel> tags.
 *
 * @author Gael Lazzari
 */
public class UiStackLayoutPanelTagFactory implements UiObjectTagFactory<StackLayoutPanel> {

    private static class UiStackLayoutPanelTag extends UiObjectTag<StackLayoutPanel> {

        @Override
        protected void appendElement(StackLayoutPanel wrapped, Element element, String namespaceURI,
                                     List<IsWidget> childWidgets) {

            if (!UiBinderXmlUtils.CLIENTUI_NSURI.equals(namespaceURI)) {
                super.appendElement(wrapped, element, namespaceURI, childWidgets);
            } else {
                handleStackLayoutPanelSpecifics(wrapped, element, childWidgets);
            }
        }

        @Override
        protected void finalizeObject(StackLayoutPanel widget) {
            // nothing to do
        }

        @Override
        protected void initializeObject(StackLayoutPanel wrapped, Map<String, Object> attributes,
                                        Object owner) {
            // nothing to do
        }

        @Override
        protected StackLayoutPanel instanciate(Class<? extends StackLayoutPanel> clazz,
                                               Map<String, Object> attributes, Object owner) {

            if (clazz != StackLayoutPanel.class) {
                // use default instanciation system
                return super.instanciate(clazz, attributes, owner);
            }

            String unit = (String) attributes.get("unit");
            Unit styleUnit = unit != null ? Unit.valueOf(unit) : Unit.PX;

            return new StackLayoutPanel(styleUnit);
        }

        private void handleStackLayoutPanelSpecifics(StackLayoutPanel wrapped, Element element,
                                                     List<IsWidget> childWidgets) {

            if ("stack".equals(element.getTagName())) {
                NodeList<Element> headers = element.getElementsByTagName("header");
                if (headers.getLength() == 1 && childWidgets.size() == 1) {
                    // case of "header"
                    String header = headers.getItem(0).getInnerHTML();
                    String headerSize = headers.getItem(0).getAttribute("size");
                    wrapped.add(childWidgets.get(0).asWidget(), header, Double.valueOf(headerSize));
                } else {
                    NodeList<Element> customHeaders = element.getElementsByTagName("customHeader");
                    if (customHeaders.getLength() == 1 && childWidgets.size() == 1) {
                        // case of "customHeader"
                        List<IsWidget> customHeaderChilds = UiBinderXmlUtils.getChildWidgets(customHeaders.getItem(0));
                        if (customHeaderChilds.size() == 1) {
                            String customHeaderSize = customHeaders.getItem(0).getAttribute("size");
                            wrapped.add(childWidgets.get(0), customHeaderChilds.get(0),
                                    Double.valueOf(customHeaderSize));
                        }
                    }
                }
            }

        }

    }

    /*
     * (non-Javadoc)
     *
     * @see com.googlecode.gwt.test.uibinder.UiWidgetTagFactory#createUiObjectTag( java.lang .Class,
     * java.util.Map)
     */
    public UiObjectTag<StackLayoutPanel> createUiObjectTag(Class<?> clazz,
                                                           Map<String, Object> attributes) {

        if (StackLayoutPanel.class.isAssignableFrom(clazz)) {
            return new UiStackLayoutPanelTag();
        }

        return null;
    }

}