/*
* Copyright 2009 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.parsers;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLElement;
import com.google.gwt.user.client.ui.StackLayoutPanel;
/**
* Parses {@link StackLayoutPanel} widgets.
*/
public class StackLayoutPanelParser implements ElementParser {
private static final String HEADER_ELEM = "header";
private static final String STACK_ELEM = "stack";
public void parse(XMLElement elem, String fieldName, JClassType type,
UiBinderWriter writer) throws UnableToCompleteException {
// StackLayoutPanel requires a unit ctor.
Unit unit = elem.consumeEnumAttribute("unit", Unit.class);
writer.setFieldInitializerAsConstructor(fieldName,
writer.getOracle().findType(StackLayoutPanel.class.getName()),
DockLayoutPanelParser.getFullyQualifiedEnumName(unit));
// Parse children.
for (XMLElement child : elem.consumeChildElements()) {
// Get the stack element.
if (!isElementType(elem, child, STACK_ELEM)) {
writer.die("In %s, Only <stack> children are allowed.", elem);
}
XMLElement headerElem = null, widgetElem = null;
for (XMLElement stackChild : child.consumeChildElements()) {
// Get the header.
if (isElementType(elem, stackChild, HEADER_ELEM)) {
if (headerElem != null) {
writer.die("In %s, Only one <header> allowed per <stack>", elem);
}
headerElem = stackChild;
continue;
}
// Get the widget.
if (widgetElem != null) {
writer.die("In %s, Only one child widget allowed per <stack>", elem);
}
widgetElem = stackChild;
}
double size = headerElem.consumeDoubleAttribute("size");
XMLElement headerWidgetElem = headerElem.consumeSingleChildElement();
String headerFieldName = writer.parseElementToField(headerWidgetElem);
String childFieldName = writer.parseElementToField(widgetElem);
writer.addStatement("%s.add(%s, %s, %f);", fieldName, childFieldName,
headerFieldName, size);
}
// Emit the layout() call.
writer.addStatement("%s.layout();", fieldName);
}
private boolean isElementType(XMLElement parent, XMLElement child, String type) {
return child.getNamespaceUri().equals(parent.getNamespaceUri())
&& type.equals(child.getLocalName());
}
}