com.google.gwt.uibinder.elementparsers.LazyPanelParser Maven / Gradle / Ivy
/*
* 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);
}
}