/*
* 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.uibinder.rebind.FieldManager;
import com.google.gwt.uibinder.rebind.FieldWriter;
import com.google.gwt.uibinder.rebind.UiBinderWriter;
import com.google.gwt.uibinder.rebind.XMLElement;
/**
* Used by {@link RenderablePanelParser} to interpret renderable elements.
* Declares the appropriate {@link IsRenderable}, and returns the correct HTML
* to be inlined in the {@link RenderablePanel}.
*/
class IsRenderableInterpreter implements XMLElement.Interpreter<String> {
private final String fieldName;
private final UiBinderWriter uiWriter;
public IsRenderableInterpreter(String fieldName, UiBinderWriter writer) {
this.fieldName = fieldName;
this.uiWriter = writer;
assert writer.useLazyWidgetBuilders();
}
public String interpretElement(XMLElement elem)
throws UnableToCompleteException {
if (!uiWriter.isRenderableElement(elem)) {
return null;
}
String idHolder = uiWriter.declareDomIdHolder();
FieldManager fieldManager = uiWriter.getFieldManager();
FieldWriter fieldWriter = fieldManager.require(fieldName);
FieldWriter childFieldWriter = uiWriter.parseElementToFieldWriter(elem);
String elementPointer = idHolder + "Element";
fieldWriter.addAttachStatement(
"com.google.gwt.user.client.Element %s = " +
"com.google.gwt.dom.client.Document.get().getElementById(%s).cast();",
elementPointer, fieldManager.convertFieldToGetter(idHolder));
fieldWriter.addAttachStatement(
"%s.wrapElement(%s);",
fieldManager.convertFieldToGetter(childFieldWriter.getName()),
elementPointer);
// Some operations are more efficient when the Widget isn't attached to
// the document. Perform them here.
fieldWriter.addDetachStatement(
"%s.performDetachedInitialization();",
fieldManager.convertFieldToGetter(childFieldWriter.getName()));
fieldWriter.addDetachStatement(
"%s.logicalAdd(%s);",
fieldManager.convertFieldToGetter(fieldName),
fieldManager.convertFieldToGetter(childFieldWriter.getName()));
// TODO(rdcastro): use the render() call that receives the SafeHtmlBuilder
String elementHtml = fieldManager.convertFieldToGetter(childFieldWriter.getName()) + ".render("
+ fieldManager.convertFieldToGetter(idHolder) + ")";
return uiWriter.tokenForSafeHtmlExpression(elementHtml);
}
}