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 * Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.javafx.scene.layout.region;

import javafx.scene.text.Font;

import javafx.css.Size;
import javafx.css.SizeUnits;
import javafx.css.ParsedValue;
import javafx.css.StyleConverter;
import com.sun.javafx.logging.PlatformLogger;
import com.sun.javafx.logging.PlatformLogger.Level;

Similar to Insets but with flag denoting values are proportional.
If proportional is true, then the values represent fractions or percentages
and are in the range 0..1, although this is not enforced.
/**
 * Similar to Insets but with flag denoting values are proportional.
 * If proportional is true, then the values represent fractions or percentages
 * and are in the range 0..1, although this is not enforced.
 */
public class Margins {

    // lazy, thread-safe instantiation
    private static class Holder {
        static Converter CONVERTER_INSTANCE = new Converter();
        static SequenceConverter SEQUENCE_CONVERTER_INSTANCE = new SequenceConverter();
    }

    final double top;
    public final double getTop() { return top; }

    final double right;
    public final double getRight() { return right; }

    final double bottom;
    public final double getBottom() { return bottom; }

    final double left;
    public final double getLeft() { return left; }

    final boolean proportional;
    public final boolean isProportional() { return proportional; }

    public Margins(double top, double right, double bottom, double left, boolean proportional) {
        this.top = top;
        this.right = right;
        this.bottom = bottom;
        this.left = left;
        this.proportional = proportional;
    }

    @Override
    public String toString() {
        return "top: "+top+"\nright: "+right+"\nbottom: "+bottom+"\nleft: "+left;
    }

    
Convert a sequence of sizes to an Margins
/**
     * Convert a sequence of sizes to an Margins
     */
    public static final class Converter extends StyleConverter<ParsedValue[], Margins> {

        public static Converter getInstance() {
            return Holder.CONVERTER_INSTANCE;
        }

        private Converter() {
            super();
        }

        @Override
        public Margins convert(ParsedValue<ParsedValue[], Margins> value, Font font) {
            ParsedValue<?, Size>[] sides = value.getValue();
            Size topSz = (sides.length > 0) ? sides[0].convert(font) : new Size(0.0F, SizeUnits.PX);
            Size rightSz = (sides.length > 1) ? sides[1].convert(font) : topSz;
            Size bottomSz = (sides.length > 2) ? sides[2].convert(font) : topSz;
            Size leftSz = (sides.length > 3) ? sides[3].convert(font) : rightSz;

            // assume proportional if any units are percent
            boolean proportional =
                    (topSz.getUnits() == SizeUnits.PERCENT)    ||
                    (rightSz.getUnits() == SizeUnits.PERCENT)  ||
                    (bottomSz.getUnits() == SizeUnits.PERCENT) ||
                    (leftSz.getUnits() == SizeUnits.PERCENT);

            // if any of the units is percent, then make sure they all are.
            boolean unitsMatch =
                !proportional ||
                ((topSz.getUnits() == SizeUnits.PERCENT)    &&
                 (rightSz.getUnits() == SizeUnits.PERCENT)  &&
                 (bottomSz.getUnits() == SizeUnits.PERCENT) &&
                 (leftSz.getUnits() == SizeUnits.PERCENT));

            // unitsMatch will only be false if proportional is true and
            // not all of the units are percent.
            if (unitsMatch == false) {
                   final PlatformLogger LOGGER = com.sun.javafx.util.Logging.getCSSLogger();
                    if (LOGGER.isLoggable(Level.WARNING)) {
                        final String msg =
                            new StringBuilder("units do no match: ")
                                .append(topSz.toString())
                                .append(" ,").append(rightSz.toString())
                                .append(" ,").append(bottomSz.toString())
                                .append(" ,").append(leftSz.toString())
                            .toString();
                        LOGGER.warning(msg);
                    }
            }

            proportional = proportional && unitsMatch;

            double top = topSz.pixels(font);
            double right = rightSz.pixels(font);
            double bottom = bottomSz.pixels(font);
            double left = leftSz.pixels(font);
            return new Margins(top, right, bottom, left, proportional);
        }

        @Override
        public String toString() {
            return "MarginsConverter";
        }
    }

    
Convert a sequence of sizes to an Insets
/**
     * Convert a sequence of sizes to an Insets
     */
    public static final class SequenceConverter extends StyleConverter<ParsedValue<ParsedValue[], Margins>[], Margins[]> {

        public static SequenceConverter getInstance() {
            return Holder.SEQUENCE_CONVERTER_INSTANCE;
        }

        private SequenceConverter() {
            super();
        }

        @Override
        public Margins[] convert(ParsedValue<ParsedValue<ParsedValue[], Margins>[], Margins[]> value, Font font) {
            ParsedValue<ParsedValue[], Margins>[] layers = value.getValue();
            Margins[] margins = new Margins[layers.length];
            for (int layer = 0; layer < layers.length; layer++) {
                margins[layer] = Converter.getInstance().convert(layers[layer], font);
            }
            return margins;
        }

        @Override
        public String toString() {
            return "MarginsSequenceConverter";
        }
    }

}