/*
* Copyright 2008 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.libideas.client;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.StyleElement;
import com.google.gwt.libideas.resources.client.DataResource;
import com.google.gwt.libideas.resources.client.ImmutableResourceBundle;
import com.google.gwt.libideas.resources.client.ResourcePrototype;
/**
* Used to add stylesheets to the document.
*/
public class StyleInjector {
/**
* The DOM-compatible way of adding stylesheets.
*/
static class StyleInjectorImpl {
void injectStyleSheet(String contents) {
StyleElement style = Document.get().createStyleElement();
style.setPropertyString("language", "text/css");
style.setInnerText(contents);
Document.get().getElementsByTagName("head").getItem(0).appendChild(style);
}
}
/**
* IE doesn't allow manipulation of a style element through DOM methods.
*/
static class StyleInjectorImplIE extends StyleInjectorImpl {
native void injectStyleSheet(String contents) /*-{
$doc.createStyleSheet().cssText = contents;
}-*/;
}
/**
* Add a stylesheet to the document.
*
* @param contents the CSS contents of the stylesheet
*/
public static void injectStylesheet(String contents) {
injectStylesheet(contents, null);
}
/**
* Add a stylesheet to the document. Any occurrence of
* <code>%resourceName%</code> in the stylesheet's contents will be replaced
* by the URL of the named {@link DataResource} contained in
* <code>references</code>.
*
* @param contents the CSS contents of the stylesheet
* @param references the resources to substitute into the stylesheet.
*/
public static void injectStylesheet(String contents,
ImmutableResourceBundle references) {
if (references != null) {
for (ResourcePrototype p : references.getResources()) {
if (p instanceof DataResource) {
contents = contents.replaceAll("%" + p.getName() + "%",
((DataResource) p).getUrl());
}
}
}
((StyleInjectorImpl) GWT.create(StyleInjectorImpl.class)).injectStyleSheet(contents);
}
/**
* Utility class.
*/
private StyleInjector() {
}
}