textfield.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * Copyright 2003-2005 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.pdf;

import java.awt.Color;
import java.io.IOException;
import java.util.ArrayList;

import com.lowagie.text.Chunk;
import com.lowagie.text.DocumentException;
import com.lowagie.text.Element;
import com.lowagie.text.Font;
import com.lowagie.text.Phrase;
import com.lowagie.text.Rectangle;

/** Supports text, combo and list fields generating the correct appearances.
 * All the option in the Acrobat GUI are supported in an easy to use API.
 * @author Paulo Soares ([e-mail])
 */
public class TextField extends BaseField {
    
    /** Holds value of property defaultText. */
    private String defaultText;
    
    /** Holds value of property choices. */
    private String[] choices;
    
    /** Holds value of property choiceExports. */
    private String[] choiceExports;
    
    /** Holds value of property choiceSelection. */
    private int choiceSelection;
    
    private int topFirst;
    
    private float extraMarginLeft;
    private float extraMarginTop;
    
    /** Creates a new <CODE>TextField</CODE>.
     * @param writer the document <CODE>PdfWriter</CODE>
     * @param box the field location and dimensions
     * @param fieldName the field name. If <CODE>null</CODE> only the widget keys
     * will be included in the field allowing it to be used as a kid field.
     */
    public TextField(PdfWriter writer, Rectangle box, String fieldName) {
        super(writer, box, fieldName);
    }
    
    private static boolean checkRTL(String text) {
        if (text == null || text.length() == 0)
            return false;
        char[] cc = text.toCharArray();
        for (int k = 0; k < cc.length; ++k) {
            int c = (int)cc[k];
            if (c >= 0x590 && c < 0x0780)
                return true;
        }
        return false;
    }
    
    private static void changeFontSize(Phrase p, float size) {
        for (int k = 0; k < p.size(); ++k) {
            ((Chunk)p.get(k)).getFont().setSize(size);
        }
    }
    
    private Phrase composePhrase(String text, BaseFont ufont, Color color, float fontSize) {
        Phrase phrase = null;
        if (extensionFont == null && (substitutionFonts == null || substitutionFonts.isEmpty()))
            phrase = new Phrase(new Chunk(text, new Font(ufont, fontSize, 0, color)));
        else {
            FontSelector fs = new FontSelector();
            fs.addFont(new Font(ufont, fontSize, 0, color));
            if (extensionFont != null)
                fs.addFont(new Font(extensionFont, fontSize, 0, color));
            if (substitutionFonts != null) {
                for (int k = 0; k < substitutionFonts.size(); ++k) {
                    fs.addFont(new Font((BaseFont)substitutionFonts.get(k), fontSize, 0, color));
                }
            }
            phrase = fs.process(text);
        }
        return phrase;
    }
    
    private static String removeCRLF(String text) {
        if (text.indexOf('\n') >= 0 || text.indexOf('\r') >= 0) {
            char[] p = text.toCharArray();
            StringBuffer sb = new StringBuffer(p.length);
            for (int k = 0; k < p.length; ++k) {
                char c = p[k];
                if (c == '\n')
                    sb.append(' ');
                else if (c == '\r') {
                    sb.append(' ');
                    if (k < p.length - 1 && p[k + 1] == '\n')
                        ++k;
                }
                else
                    sb.append(c);
            }
            return sb.toString();
        }
        return text;
    }
    
    public PdfAppearance getAppearance() throws IOException, DocumentException {
        PdfAppearance app = getBorderAppearance();
        app.beginVariableText();
        if (text == null || text.length() == 0) {
            app.endVariableText();
            return app;
        }
        BaseFont ufont = getRealFont();
        boolean borderExtra = borderStyle == PdfBorderDictionary.STYLE_BEVELED || borderStyle == PdfBorderDictionary.STYLE_INSET;
        float h = box.getHeight() - borderWidth * 2;
        float bw2 = borderWidth;
        if (borderExtra) {
            h -= borderWidth * 2;
            bw2 *= 2;
        }
        h -= extraMarginTop;
        float offsetX = (borderExtra ? 2 * borderWidth : borderWidth);
        offsetX = Math.max(offsetX, 1);
        float offX = Math.min(bw2, offsetX);
        app.saveState();
        app.rectangle(offX, offX, box.getWidth() - 2 * offX, box.getHeight() - 2 * offX);
        app.clip();
        app.newPath();
        Color fcolor = (textColor == null) ? GrayColor.GRAYBLACK : textColor;
        String ptext = text; //fixed by Kazuya Ujihara (ujihara.jp)
        if ((options & PASSWORD) != 0) { 
            char[] pchar = new char[text.length()];
            for (int i = 0; i < text.length(); i++)
                pchar[i] = '*';
            ptext = new String(pchar);
        }
        int rtl = checkRTL(ptext) ? PdfWriter.RUN_DIRECTION_LTR : PdfWriter.RUN_DIRECTION_NO_BIDI;
        if ((options & MULTILINE) == 0) {
            ptext = removeCRLF(text);
        }
        Phrase phrase = composePhrase(ptext, ufont, fcolor, fontSize);
        if ((options & MULTILINE) != 0) {
            float usize = fontSize;
            float width = box.getWidth() - 4 * offsetX - extraMarginLeft;
            float factor = ufont.getFontDescriptor(BaseFont.BBOXURY, 1) - ufont.getFontDescriptor(BaseFont.BBOXLLY, 1);
            ColumnText ct = new ColumnText(null);
            if (usize == 0) {
                usize = h / factor;
                if (usize > 4) {
                    if (usize > 12)
                        usize = 12;
                    float step = Math.max((usize - 4) / 10, 0.2f);
                    ct.setSimpleColumn(0, -h, width, 0);
                    ct.setAlignment(alignment);
                    ct.setRunDirection(rtl);
                    for (; usize > 4; usize -= step) {
                        ct.setYLine(0);
                        changeFontSize(phrase, usize);
                        ct.setText(phrase);
                        ct.setLeading(factor * usize);
                        int status = ct.go(true);
                        if ((status & ColumnText.NO_MORE_COLUMN) == 0)
                            break;
                    }
                }
                if (usize < 4) {
                    usize = 4;
                }
            }
            changeFontSize(phrase, usize);
            ct.setCanvas(app);
            float leading = usize * factor;
            float offsetY = offsetX + h - ufont.getFontDescriptor(BaseFont.BBOXURY, usize);
            ct.setSimpleColumn(extraMarginLeft + 2 * offsetX, -20000, box.getWidth() - 2 * offsetX, offsetY + leading);
            ct.setLeading(leading);
            ct.setAlignment(alignment);
            ct.setRunDirection(rtl);
            ct.setText(phrase);
            ct.go();
        }
        else {
            float usize = fontSize;
            if (usize == 0) {
                float maxCalculatedSize = h / (ufont.getFontDescriptor(BaseFont.BBOXURX, 1) - ufont.getFontDescriptor(BaseFont.BBOXLLY, 1));
                changeFontSize(phrase, 1);
                float wd = ColumnText.getWidth(phrase, rtl, 0);
                if (wd == 0)
                    usize = maxCalculatedSize;
                else
                    usize = (box.getWidth() - extraMarginLeft - 4 * offsetX) / wd;
                if (usize > maxCalculatedSize)
                    usize = maxCalculatedSize;
                if (usize < 4)
                    usize = 4;
            }
            changeFontSize(phrase, usize);
            float offsetY = offX + ((box.getHeight() - 2*offX) - ufont.getFontDescriptor(BaseFont.ASCENT, usize)) / 2;
            if (offsetY < offX)
                offsetY = offX;
            if (offsetY - offX < -ufont.getFontDescriptor(BaseFont.DESCENT, usize)) {
                float ny = -ufont.getFontDescriptor(BaseFont.DESCENT, usize) + offX;
                float dy = box.getHeight() - offX - ufont.getFontDescriptor(BaseFont.ASCENT, usize);
                offsetY = Math.min(ny, Math.max(offsetY, dy));
            }
            if ((options & COMB) != 0 && maxCharacterLength > 0) {
                int textLen = Math.min(maxCharacterLength, ptext.length());
                int position = 0;
                if (alignment == Element.ALIGN_RIGHT) {
                    position = maxCharacterLength - textLen;
                }
                else if (alignment == Element.ALIGN_CENTER) {
                    position = (maxCharacterLength - textLen) / 2;
                }
                float step = (box.getWidth() - extraMarginLeft) / maxCharacterLength;
                float start = step / 2 + position * step;
                if (textColor == null)
                    app.setGrayFill(0);
                else
                    app.setColorFill(textColor);
                app.beginText();
                for (int k = 0; k < phrase.size(); ++k) {
                    Chunk ck = (Chunk)phrase.get(k);
                    BaseFont bf = ck.getFont().getBaseFont();
                    app.setFontAndSize(bf, usize);
                    StringBuffer sb = ck.append("");
                    for (int j = 0; j < sb.length(); ++j) {
                        String c = sb.substring(j, j + 1);
                        float wd = bf.getWidthPoint(c, usize);
                        app.setTextMatrix(extraMarginLeft + start - wd / 2, offsetY - extraMarginTop);
                        app.showText(c);
                        start += step;
                    }
                }
                app.endText();
            }
            else {
                if (alignment == Element.ALIGN_RIGHT) {
                    ColumnText.showTextAligned(app, Element.ALIGN_RIGHT, phrase, extraMarginLeft + box.getWidth() - 2 * offsetX, offsetY - extraMarginTop, 0, rtl, 0);
                }
                else if (alignment == Element.ALIGN_CENTER) {
                    ColumnText.showTextAligned(app, Element.ALIGN_CENTER, phrase, extraMarginLeft + box.getWidth() / 2, offsetY - extraMarginTop, 0, rtl, 0);
                }
                else
                    ColumnText.showTextAligned(app, Element.ALIGN_LEFT, phrase, extraMarginLeft + 2 * offsetX, offsetY - extraMarginTop, 0, rtl, 0);
            }
        }
        app.restoreState();
        app.endVariableText();
        return app;
    }

    PdfAppearance getListAppearance() throws IOException, DocumentException {
        PdfAppearance app = getBorderAppearance();
        app.beginVariableText();
        if (choices == null || choices.length == 0) {
            app.endVariableText();
            return app;
        }
        int topChoice = choiceSelection;
        if (topChoice >= choices.length) {
            topChoice = choices.length - 1;
        }
        if (topChoice < 0)
            topChoice = 0;
        BaseFont ufont = getRealFont();
        float usize = fontSize;
        if (usize == 0)
            usize = 12;
        boolean borderExtra = borderStyle == PdfBorderDictionary.STYLE_BEVELED || borderStyle == PdfBorderDictionary.STYLE_INSET;
        float h = box.getHeight() - borderWidth * 2;
        if (borderExtra)
            h -= borderWidth * 2;
        float offsetX = (borderExtra ? 2 * borderWidth : borderWidth);
        float leading = ufont.getFontDescriptor(BaseFont.BBOXURY, usize) - ufont.getFontDescriptor(BaseFont.BBOXLLY, usize);
        int maxFit = (int)(h / leading) + 1;
        int first = 0;
        int last = 0;
        last = topChoice + maxFit / 2 + 1;
        first = last - maxFit;
        if (first < 0) {
            last += first;
            first = 0;
        }
//        first = topChoice;
        last = first + maxFit;
        if (last > choices.length)