| /* |
| * Copyright 2011 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.uibinder.elementparsers; |
| |
| import com.google.gwt.core.ext.UnableToCompleteException; |
| import com.google.gwt.core.ext.typeinfo.JClassType; |
| import com.google.gwt.uibinder.rebind.FieldWriter; |
| import com.google.gwt.uibinder.rebind.UiBinderWriter; |
| import com.google.gwt.uibinder.rebind.XMLElement; |
| import com.google.gwt.user.client.ui.LazyPanel; |
| import com.google.gwt.user.client.ui.Widget; |
| |
| /** |
| * Parses {@link com.google.gwt.user.client.ui.LazyPanel} widgets. |
| */ |
| public class LazyPanelParser implements ElementParser { |
| |
| private static final String INITIALIZER_FORMAT = "new %s() {\n" |
| + " protected %s createWidget() {\n" |
| + " return %s;\n" |
| + " }\n" |
| + "}"; |
| |
| public void parse(XMLElement elem, String fieldName, JClassType type, |
| UiBinderWriter writer) throws UnableToCompleteException { |
| |
| if (writer.getOwnerClass().getUiField(fieldName).isProvided()) { |
| return; |
| } |
| |
| if (!writer.useLazyWidgetBuilders()) { |
| writer.die("LazyPanel only works with UiBinder.useLazyWidgetBuilders enabled."); |
| } |
| |
| XMLElement child = elem.consumeSingleChildElement(); |
| if (!writer.isWidgetElement(child)) { |
| writer.die(child, "Expecting only widgets in %s", elem); |
| } |
| |
| FieldWriter childField = writer.parseElementToField(child); |
| |
| String lazyPanelClassPath = LazyPanel.class.getName(); |
| String widgetClassPath = Widget.class.getName(); |
| |
| String code = String.format(INITIALIZER_FORMAT, lazyPanelClassPath, |
| widgetClassPath, childField.getNextReference()); |
| writer.setFieldInitializer(fieldName, code); |
| } |
| } |