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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.log4j.chainsaw;
18  
19  import java.awt.Font;
20  
21  import javax.swing.UIManager;
22  import javax.swing.text.Document;
23  import javax.swing.text.JTextComponent;
24  import javax.swing.text.html.HTMLDocument;
25  
26  /**
27   * Apply system font and size (normal size + 1) rule if the JEditorPane document contains html.
28   */
29  public class JTextComponentFormatter
30  {
31      public static void applySystemFontAndSize(JTextComponent textComponent) {
32          Document document = textComponent.getDocument();
33          if (document instanceof HTMLDocument) {
34            Font font = UIManager.getFont("Label.font");
35            String bodyRule = "body { font-family: " + font.getFamily() + "; font-size: " + (font.getSize() + 1) + "pt; }";
36            ((HTMLDocument)document).getStyleSheet().addRule(bodyRule);
37          }
38      }
39  }