com.google.gwt.uibinder.elementparsers.DisclosurePanelParser Maven / Gradle / Ivy
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/*
* 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.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;
/**
* Parses {@link com.google.gwt.user.client.ui.DisclosurePanel} widgets.
*/
public class DisclosurePanelParser implements ElementParser {
private static class Children {
XMLElement body;
XMLElement header;
XMLElement customHeader;
}
private static final String CUSTOM = "customHeader";
private static final String HEADER = "header";
private static final String OPEN_IMAGE = "openImage";
private static final String CLOSED_IMAGE = "closedImage";
public void parse(final XMLElement panelElem, String panelField,
JClassType type, final UiBinderWriter writer)
throws UnableToCompleteException {
Children children = findChildren(panelElem, writer);
if (children.body != null) {
if (!writer.isWidgetElement(children.body)) {
writer.die(children.body, "Must be a widget");
}
FieldWriter bodyField = writer.parseElementToField(children.body);
writer.addStatement("%s.add(%s);", panelField, bodyField.getNextReference());
}
if (children.customHeader != null) {
XMLElement headerElement = children.customHeader.consumeSingleChildElement();
if (!writer.isWidgetElement(headerElement)) {
writer.die(headerElement, "Must be a widget");
}
FieldWriter headerField = writer.parseElementToField(headerElement);
writer.addStatement("%s.setHeader(%s);", panelField, headerField.getNextReference());
}
if (children.header != null) {
String openImage = children.header.consumeImageResourceAttribute(OPEN_IMAGE);
String closedImage = children.header.consumeImageResourceAttribute(CLOSED_IMAGE);
String headerText = children.header.consumeInnerTextEscapedAsHtmlStringLiteral(new TextInterpreter(
writer));
if (openImage == null ^ closedImage == null) {
writer.die(children.header,
"Both %s and %s must be specified, or neither", OPEN_IMAGE,
CLOSED_IMAGE);
}
String panelTypeName = type.getQualifiedSourceName();
if (openImage != null) {
writer.setFieldInitializer(panelField, String.format(
"new %s(%s, %s, \"%s\")", panelTypeName, openImage, closedImage,
headerText));
} else {
writer.setFieldInitializer(panelField,
String.format("new %s(\"%s\")", panelTypeName, headerText));
}
}
}
private Children findChildren(final XMLElement elem,
final UiBinderWriter writer) throws UnableToCompleteException {
final Children children = new Children();
elem.consumeChildElements(new XMLElement.Interpreter() {
public Boolean interpretElement(XMLElement child)
throws UnableToCompleteException {
if (hasTag(child, HEADER)) {
assertFirstHeader();
children.header = child;
return true;
}
if (hasTag(child, CUSTOM)) {
assertFirstHeader();
children.customHeader = child;
return true;
}
// Must be the body, then
if (children.body != null) {
writer.die(elem, "May have only one body element");
}
children.body = child;
return true;
}
void assertFirstHeader() throws UnableToCompleteException {
if (children.header != null || children.customHeader != null) {
writer.die(elem, "May have only one <%1$s:header> "
+ "or <%1$s:customHeader>", elem.getPrefix());
}
}
private boolean hasTag(XMLElement child, String tag) {
return elem.getNamespaceUri().equals(child.getNamespaceUri())
&& tag.equals(child.getLocalName());
}
});
return children;
}
}