Java Swing Text Format getBidiVisualPosition(final int start, final int end, final Element neighbouringElement, final int pos, final Position.Bias b0, final Position.Bias[] biasRet, final int length, final boolean toWest, final boolean isLTR)

Description

get Bidi Visual Position

License

Apache License

Declaration

static final int getBidiVisualPosition(final int start, final int end, final Element neighbouringElement,
            final int pos, final Position.Bias b0, final Position.Bias[] biasRet, final int length,
            final boolean toWest, final boolean isLTR) 

Method Source Code

//package com.java2s;
/*//from w  ww. j a  v  a 2s.c o m
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

import javax.swing.text.Element;

import javax.swing.text.Position;

public class Main {
    static final Position.Bias backward = Position.Bias.Backward;
    static final Position.Bias forward = Position.Bias.Forward;

    static final int getBidiVisualPosition(final int start, final int end, final Element neighbouringElement,
            final int pos, final Position.Bias b0, final Position.Bias[] biasRet, final int length,
            final boolean toWest, final boolean isLTR) {
        boolean direction = toWest ^ isLTR;
        if (pos == end && direction && b0 == forward) {
            biasRet[0] = backward;
            return pos + 1;
        } else if (pos == start + 1 && pos <= end && !direction) {
            return pos - 1;
        } else if (pos == start) {
            if (direction) {
                return (b0 == forward) ? pos + 1 : pos - 1;
            }
            biasRet[0] = b0;
            return neighbouringElement.getStartOffset();
        } else {
            return getTrivialVisualPosition(toWest, pos, b0, length, biasRet, isLTR);
        }
    }

    private static int getTrivialVisualPosition(final boolean toWest, final int pos, final Position.Bias bias,
            final int docLength, final Position.Bias[] biasRet, final boolean isLTR) {
        boolean condition = (toWest && isLTR) || (!toWest && !isLTR);
        return condition ? Math.max(pos - 1, 0) : Math.min(pos + 1, docLength);
    }
}

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