    001// Licensed under the Apache License, Version 2.0 (the "License");
    002// you may not use this file except in compliance with the License.
    003// You may obtain a copy of the License at
    004//
    005// http://www.apache.org/licenses/LICENSE-2.0
    006//
    007// Unless required by applicable law or agreed to in writing, software
    008// distributed under the License is distributed on an "AS IS" BASIS,
    009// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    010// See the License for the specific language governing permissions and
    011// limitations under the License.
    012
    013package org.apache.tapestry5.internal.services.javascript;
    014
    015import org.apache.tapestry5.MarkupWriter;
    016import org.apache.tapestry5.dom.Element;
    017import org.apache.tapestry5.services.MarkupRenderer;
    018import org.apache.tapestry5.services.MarkupRendererFilter;
    019
    020/**
    021 * Responsible for adding additional style tags that contain directives for non-standards compatible browsers
    022 *
    023 * @since 5.4
    024 */
    025public class AddBrowserCompatibilityStyles implements MarkupRendererFilter
    026{
    027    private final String ie9, ie8;
    028
    029    public AddBrowserCompatibilityStyles()
    030    {
    031        this(.25);
    032    }
    033
    034    public AddBrowserCompatibilityStyles(double opacity)
    035    {
    036        // IE9 does not support CSS animations, so we make the loading mask translucent
    037        ie9 = String.format("<!--[if IE 9]><style type=\"text/css\">.pageloading-mask{opacity:%.2f;}</style><![endif]-->", opacity);
    038        // Older IE versions do not even support opacity, we'll have to resort to a filter
    039        ie8 = String.format("<!--[if lt IE 9]><style type=\"text/css\">.pageloading-mask{filter:alpha(opacity=%d);}</style><![endif]-->",
    040                (int) (100. * opacity));
    041    }
    042
    043    public void renderMarkup(MarkupWriter writer, MarkupRenderer renderer)
    044    {
    045        renderer.renderMarkup(writer);
    046
    047        Element head = writer.getDocument().find("html/head");
    048
    049        // Only add the respective style documents if we've rendered an HTML document
    050        if (head != null)
    051        {
    052            head.raw(ie9);
    053            head.raw(ie8);
    054        }
    055    }
    056}