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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 javax.swing.*;
    20  import javax.swing.text.Document;
    21  import javax.swing.text.JTextComponent;
    22  import javax.swing.text.html.HTMLDocument;
    23  import java.awt.*;
    24
    25  /**
    26   * Apply system font and size (normal size + 1) rule if the JEditorPane document contains html.
    27   */
    28  public class JTextComponentFormatter {
    29      public static void applySystemFontAndSize(JTextComponent textComponent) {
    30          Document document = textComponent.getDocument();
    31          if (document instanceof HTMLDocument) {
    32              Font font = UIManager.getFont("Label.font");
    33              String bodyRule = "body { font-family: " + font.getFamily() + "; font-size: " + (font.getSize() + 1) + "pt; }";
    34              ((HTMLDocument) document).getStyleSheet().addRule(bodyRule);
    35          }
    36      }
    37  }