1 /*
   2  * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package javafx.css.converter;
  27 
  28 import javafx.css.Size;
  29 import javafx.css.ParsedValue;
  30 import javafx.css.StyleConverter;
  31 import javafx.geometry.Insets;
  32 import javafx.scene.text.Font;
  33 
  34 /**
  35  * Converts a parsed value array of 1 to 4 size components to an Insets.
  36  * The size values are interpreted as
  37  * top, right, bottom, left.
  38  * If only top is given, that value is used on all sides.
  39  * If there is only top and right, then bottom is set to top and left is set to right.
  40  * If top, right and bottom are given, then left is set to right.
  41  *
  42  * @since 9
  43  */
  44 public final class InsetsConverter extends StyleConverter<ParsedValue[], Insets> {
  45 
  46     // lazy, thread-safe instatiation
  47     private static class Holder {
  48         static final InsetsConverter INSTANCE = new InsetsConverter();
  49         static final SequenceConverter SEQUENCE_INSTANCE = new SequenceConverter();
  50     }
  51 
  52     public static StyleConverter<ParsedValue[], Insets> getInstance() {
  53         return Holder.INSTANCE;
  54     }
  55 
  56     private InsetsConverter() {
  57         super();
  58     }
  59 
  60     @Override
  61     public Insets convert(ParsedValue<ParsedValue[], Insets> value, Font font) {
  62         ParsedValue[] sides = value.getValue();
  63         double top = ((Size)sides[0].convert(font)).pixels(font);
  64         double right = (sides.length > 1) ? ((Size)sides[1].convert(font)).pixels(font) : top;
  65         double bottom = (sides.length > 2) ? ((Size)sides[2].convert(font)).pixels(font) : top;
  66         double left = (sides.length > 3) ? ((Size)sides[3].convert(font)).pixels(font) : right;
  67         return new Insets(top, right, bottom, left);
  68     }
  69 
  70     @Override
  71     public String toString() {
  72         return "InsetsConverter";
  73     }
  74 
  75     /**
  76      * Converts an array of parsed values, each of which is an array
  77      * of 1 to 4 size components, to an array of Insets objects.
  78      */
  79     public static final class SequenceConverter extends StyleConverter<ParsedValue<ParsedValue[], Insets>[], Insets[]> {
  80 
  81         public static SequenceConverter getInstance() {
  82             return Holder.SEQUENCE_INSTANCE;
  83         }
  84 
  85         private SequenceConverter() {
  86             super();
  87         }
  88 
  89         @Override
  90         public Insets[] convert(ParsedValue<ParsedValue<ParsedValue[], Insets>[], Insets[]> value, Font font) {
  91             ParsedValue<ParsedValue[], Insets>[] layers = value.getValue();
  92             Insets[] insets = new Insets[layers.length];
  93             for (int layer = 0; layer < layers.length; layer++) {
  94                 insets[layer] = InsetsConverter.getInstance().convert(layers[layer], font);
  95             }
  96             return insets;
  97         }
  98 
  99         @Override
 100         public String toString() {
 101             return "InsetsSequenceConverter";
 102         }
 103     }
 104 }
 105