Android Open Source - caddisfly-app-camera Text Justify Utils

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) TernUp Research Labs//from  ww w.j  a  va 2  s .c  o  m
 *
 * This file is part of Caddisfly
 *
 * Caddisfly is free software: you can redistribute it and modify it under the terms of
 * the GNU Affero General Public License (AGPL) as published by the Free Software Foundation,
 * either version 3 of the License or any later version.
 *
 * Caddisfly 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 Affero General Public License included below for more details.
 *
 * The full license text can also be seen at <http://www.gnu.org/licenses/agpl.html>.
 */

package com.ternup.caddisfly.util;

import android.graphics.Paint;
import android.view.Gravity;
import android.widget.TextView;

/*!
 * 
 * TextJustifyUtils.java
 * @author Mathew Kurian
 *  
 * From TextJustify-Android Library v1.0.2
 * https://github.com/bluejamesbond/TextJustify-Android
 *
 * Please report any issues
 * https://github.com/bluejamesbond/TextJustify-Android/issues
 * 
 * Date: 12/13/2013 12:29:16 PM
 * 
 */

public class TextJustifyUtils {

    final static String SYSTEM_NEWLINE = "\n";

    final static float COMPLEXITY = 5.12f;
            //Reducing this will increase efficiency but will decrease effectiveness

    final static Paint p = new Paint();

    // Please use run(...) instead
    public static void justify(TextView textView) {
        Paint paint = new Paint();

        String[] blocks;
        float spaceOffset = 0;
        float textWrapWidth = 0;

        int spacesToSpread;
        float wrappedEdgeSpace;
        String block;
        String[] lineAsWords;
        String wrappedLine;
        String smb = "";
        Object[] wrappedObj;

        // Pull widget properties
        paint.setColor(textView.getCurrentTextColor());
        paint.setTypeface(textView.getTypeface());
        paint.setTextSize(textView.getTextSize());

        textWrapWidth = textView.getWidth();
        spaceOffset = paint.measureText(" ");
        blocks = textView.getText().toString().split("((?<=\n)|(?=\n))");

        if (textWrapWidth < 20) {
            return;
        }

        for (int i = 0; i < blocks.length; i++) {
            block = blocks[i];

            if (block.length() == 0) {
                continue;
            } else if (block.equals("\n")) {
                smb += block;
                continue;
            }

            block = block.trim();

            if (block.length() == 0) {
                continue;
            }

            wrappedObj = TextJustifyUtils
                    .createWrappedLine(block, paint, spaceOffset, textWrapWidth);
            wrappedLine = ((String) wrappedObj[0]);
            wrappedEdgeSpace = (Float) wrappedObj[1];
            lineAsWords = wrappedLine.split(" ");
            spacesToSpread = (int) (wrappedEdgeSpace != Float.MIN_VALUE ? wrappedEdgeSpace
                    / spaceOffset : 0);

            for (String word : lineAsWords) {
                smb += word + " ";

                if (--spacesToSpread > 0) {
                    smb += " ";
                }
            }

            smb = smb.trim();

            if (blocks[i].length() > 0) {
                blocks[i] = blocks[i].substring(wrappedLine.length());

                if (blocks[i].length() > 0) {
                    smb += "\n";
                }

                i--;
            }
        }

        textView.setGravity(Gravity.LEFT);
        textView.setText(smb);
    }

    public static Object[] createWrappedLine(String block, Paint paint, float spaceOffset,
            float maxWidth) {
        float cacheWidth = maxWidth;
        float origMaxWidth = maxWidth;

        String line = "";

        for (String word : block.split("\\s")) {
            cacheWidth = paint.measureText(word);
            maxWidth -= cacheWidth;

            if (maxWidth <= 0) {
                return new Object[]{line, maxWidth + cacheWidth + spaceOffset};
            }

            line += word + " ";
            maxWidth -= spaceOffset;

        }

        if (paint.measureText(block) <= origMaxWidth) {
            return new Object[]{block, Float.MIN_VALUE};
        }

        return new Object[]{line, maxWidth};
    }

    /* @author Mathew Kurian */

    public static void run(final TextView tv, float origWidth) {
        String s = tv.getText().toString();
        p.setTypeface(tv.getTypeface());
        String[] splits = s.split(SYSTEM_NEWLINE);
        float width = origWidth - 5;
        for (int x = 0; x < splits.length; x++) {
            if (p.measureText(splits[x]) > width) {
                splits[x] = wrap(splits[x], width, p);
                String[] microSplits = splits[x].split(SYSTEM_NEWLINE);
                for (int y = 0; y < microSplits.length - 1; y++) {
                    microSplits[y] = justify(removeLast(microSplits[y], " "), width, p);
                }
                StringBuilder smb_internal = new StringBuilder();
                for (int z = 0; z < microSplits.length; z++) {
                    smb_internal
                            .append(microSplits[z] + ((z + 1 < microSplits.length) ? SYSTEM_NEWLINE
                                    : ""));
                }
                splits[x] = smb_internal.toString();
            }
        }
        final StringBuilder smb = new StringBuilder();
        for (String cleaned : splits) {
            smb.append(cleaned + SYSTEM_NEWLINE);
        }
        tv.setGravity(Gravity.LEFT);
        tv.setText(smb);
    }

    private static String wrap(String s, float width, Paint p) {
        String[] str = s.split("\\s"); //regex
        StringBuilder smb = new StringBuilder(); //save memory
        smb.append(SYSTEM_NEWLINE);
        for (int x = 0; x < str.length; x++) {
            float length = p.measureText(str[x]);
            String[] pieces = smb.toString().split(SYSTEM_NEWLINE);
            try {
                if (p.measureText(pieces[pieces.length - 1]) + length > width) {
                    smb.append(SYSTEM_NEWLINE);
                }
            } catch (Exception e) {
            }
            smb.append(str[x] + " ");
        }
        return smb.toString().replaceFirst(SYSTEM_NEWLINE, "");
    }

    private static String removeLast(String s, String g) {
        if (s.contains(g)) {
            int index = s.lastIndexOf(g);
            int indexEnd = index + g.length();
            if (index == 0) {
                return s.substring(1);
            } else if (index == s.length() - 1) {
                return s.substring(0, index);
            } else {
                return s.substring(0, index) + s.substring(indexEnd);
            }
        }
        return s;
    }

    private static String justifyOperation(String s, float width, Paint p) {
        float holder = (float) (COMPLEXITY * Math.random());
        while (s.contains(Float.toString(holder))) {
            holder = (float) (COMPLEXITY * Math.random());
        }
        String holder_string = Float.toString(holder);
        float lessThan = width;
        int timeOut = 100;
        int current = 0;
        while (p.measureText(s) < lessThan && current < timeOut) {
            s = s.replaceFirst(" ([^" + holder_string + "])", " " + holder_string + "$1");
            lessThan = p.measureText(holder_string) + lessThan - p.measureText(" ");
            current++;
        }
        String cleaned = s.replaceAll(holder_string, " ");
        return cleaned;
    }

    private static String justify(String s, float width, Paint p) {
        while (p.measureText(s) < width) {
            s = justifyOperation(s, width, p);
        }
        return s;
    }
}

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