pdfchunk.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

            if (wordIdx > lastSpace) {
                String pre = hyphenationEvent.getHyphenatedWordPre(value.substring(lastSpace, wordIdx), font.getFont(), font.size(), width - lastSpaceWidth);
                String post = hyphenationEvent.getHyphenatedWordPost();
                if (pre.length() > 0) {
                    String returnValue = post + value.substring(wordIdx);
                    value = trim(value.substring(0, lastSpace) + pre);
                    PdfChunk pc = new PdfChunk(returnValue, this);
                    return pc;
                }
            }
        }
        String returnValue = value.substring(splitPosition);
        value = trim(value.substring(0, splitPosition));
        PdfChunk pc = new PdfChunk(returnValue, this);
        return pc;
    }
    
/**
 * Truncates this <CODE>PdfChunk</CODE> if it's too long for the given width.
 * <P>
 * Returns <VAR>null</VAR> if the <CODE>PdfChunk</CODE> wasn't truncated.
 *
 * @param		width		a given width
 * @return		the <CODE>PdfChunk</CODE> that doesn't fit into the width.
 */
    
    PdfChunk truncate(float width) {
        if (image != null) {
            if (image.getScaledWidth() > width) {
                PdfChunk pc = new PdfChunk("", this);
                value = "";
                attributes.remove(Chunk.IMAGE);
                image = null;
                font = PdfFont.getDefaultFont();
                return pc;
            }
            else
                return null;
        }
        
        int currentPosition = 0;
        float currentWidth = 0;
        
        // it's no use trying to split if there isn't even enough place for a space
        if (width < font.width()) {
            String returnValue = value.substring(1);
            value = value.substring(0, 1);
            PdfChunk pc = new PdfChunk(returnValue, this);
            return pc;
        }
        
        // loop over all the characters of a string
        // or until the totalWidth is reached
        int length = value.length();
        char character;
        while (currentPosition < length) {
            // the width of every character is added to the currentWidth
            character = value.charAt(currentPosition);
            currentWidth += font.width(character);
            if (currentWidth > width)
                break;
            currentPosition++;
        }
        
        // if all the characters fit in the total width, null is returned (there is no overflow)
        if (currentPosition == length) {
            return null;
        }
        
        // otherwise, the string has to be truncated
        //currentPosition -= 2;
        // we have to chop off minimum 1 character from the chunk
        if (currentPosition == 0) {
            currentPosition = 1;
        }
        String returnValue = value.substring(currentPosition);
        value = value.substring(0, currentPosition);
        PdfChunk pc = new PdfChunk(returnValue, this);
        return pc;
    }
    
    // methods to retrieve the membervariables
    
/**
 * Returns the font of this <CODE>Chunk</CODE>.
 *
 * @return	a <CODE>PdfFont</CODE>
 */
    
    PdfFont font() {
        return font;
    }
    
/**
 * Returns the color of this <CODE>Chunk</CODE>.
 *
 * @return	a <CODE>Color</CODE>
 */
    
    Color color() {
        return (Color)noStroke.get(Chunk.COLOR);
    }
    
/**
 * Returns the width of this <CODE>PdfChunk</CODE>.
 *
 * @return	a width
 */
    
    float width() {
        return font.width(value);
    }
    
/**
 * Checks if the <CODE>PdfChunk</CODE> split was caused by a newline.
 * @return <CODE>true</CODE> if the <CODE>PdfChunk</CODE> split was caused by a newline.
 */
    
    public boolean isNewlineSplit()
    {
        return newlineSplit;
    }
    
/**
 * Gets the width of the <CODE>PdfChunk</CODE> taking into account the
 * extra character and word spacing.
 * @param charSpacing the extra character spacing
 * @param wordSpacing the extra word spacing
 * @return the calculated width
 */
    
    public float getWidthCorrected(float charSpacing, float wordSpacing)
    {
        if (image != null) {
            return image.getScaledWidth() + charSpacing;
        }
        int numberOfSpaces = 0;
        int idx = -1;
        while ((idx = value.indexOf(' ', idx + 1)) >= 0)
            ++numberOfSpaces;
        return width() + (value.length() * charSpacing + numberOfSpaces * wordSpacing);
    }
    
    /**
     * Gets the text displacement relatiev to the baseline.
     * @return a displacement in points
     */
    public float getTextRise() {
    	Float f = (Float) getAttribute(Chunk.SUBSUPSCRIPT);
    	if (f != null) {
    		return f.floatValue();
    	}
    	return 0.0f;
    }
    
/**
 * Trims the last space.
 * @return the width of the space trimmed, otherwise 0
 */
    
    public float trimLastSpace()
    {
        BaseFont ft = font.getFont();
        if (ft.getFontType() == BaseFont.FONT_TYPE_CJK && ft.getUnicodeEquivalent(' ') != ' ') {
            if (value.length() > 1 && value.endsWith("\u0001")) {
                value = value.substring(0, value.length() - 1);
                return font.width('\u0001');
            }
        }
        else {
            if (value.length() > 1 && value.endsWith(" ")) {
                value = value.substring(0, value.length() - 1);
                return font.width(' ');
            }
        }
        return 0;
    }    
    public float trimFirstSpace()
    {
        BaseFont ft = font.getFont();
        if (ft.getFontType() == BaseFont.FONT_TYPE_CJK && ft.getUnicodeEquivalent(' ') != ' ') {
            if (value.length() > 1 && value.startsWith("\u0001")) {
                value = value.substring(1);
                return font.width('\u0001');
            }
        }
        else {
            if (value.length() > 1 && value.startsWith(" ")) {
                value = value.substring(1);
                return font.width(' ');
            }
        }
        return 0;
    }
    
/**
 * Gets an attribute. The search is made in <CODE>attributes</CODE>
 * and <CODE>noStroke</CODE>.
 * @param name the attribute key
 * @return the attribute value or null if not found
 */
    
    Object getAttribute(String name)
    {
        if (attributes.containsKey(name))
            return attributes.get(name);
        return noStroke.get(name);
    }
    
/**
 *Checks if the attribute exists.
 * @param name the attribute key
 * @return <CODE>true</CODE> if the attribute exists
 */
    
    boolean isAttribute(String name)
    {
        if (attributes.containsKey(name))
            return true;
        return noStroke.containsKey(name);
    }
    
/**
 * Checks if this <CODE>PdfChunk</CODE> needs some special metrics handling.
 * @return <CODE>true</CODE> if this <CODE>PdfChunk</CODE> needs some special metrics handling.
 */
    
    boolean isStroked()
    {
        return (!attributes.isEmpty());
    }
    
/**
 * Checks if there is an image in the <CODE>PdfChunk</CODE>.
 * @return <CODE>true</CODE> if an image is present
 */
    
    boolean isImage()
    {
        return image != null;
    }
    
/**
 * Gets the image in the <CODE>PdfChunk</CODE>.
 * @return the image or <CODE>null</CODE>
 */
    
    Image getImage()
    {
        return image;
    }
    
/**
 * Sets the image offset in the x direction
 * @param  offsetX the image offset in the x direction
 */
    
    void setImageOffsetX(float offsetX)
    {
        this.offsetX = offsetX;
    }
    
/**
 * Gets the image offset in the x direction
 * @return the image offset in the x direction
 */
    
    float getImageOffsetX()
    {
        return offsetX;
    }
    
/**
 * Sets the image offset in the y direction
 * @param  offsetY the image offset in the y direction
 */
    
    void setImageOffsetY(float offsetY)
    {
        this.offsetY = offsetY;
    }
    
/**
 * Gets the image offset in the y direction
 * @return Gets the image offset in the y direction
 */
    
    float getImageOffsetY()
    {
        return offsetY;
    }
    
/**
 * sets the value.
 * @param value content of the Chunk
 */
    
    void setValue(String value)
    {
        this.value = value;
    }

    /**
     * @see java.lang.Object#toString()
     */
    public String toString() {
        return value;
    }

    /**
     * Tells you if this string is in Chinese, Japanese, Korean or Identity-H.
     * @return true if the Chunk has a special encoding
     */
    
    boolean isSpecialEncoding() {
        return encoding.equals(CJKFont.CJK_ENCODING) || encoding.equals(BaseFont.IDENTITY_H);
    }
    
    /**
     * Gets the encoding of this string.
     *
     * @return		a <CODE>String</CODE>
     */
    
    String getEncoding() {
        return encoding;
    }

    int length() {
        return value.length();
    }
/**
 * Checks if a character can be used to split a <CODE>PdfString</CODE>.
 * <P>
 * for the moment every character less than or equal to SPACE and the character '-' are 'splitCharacters'.
 * 
 * @param start start position in the array
 * @param current current position in the array
 * @param end end position in the array
 * @param	cc		the character array that has to be checked
 * @param ck chunk array
 * @return	<CODE>true</CODE> if the character can be used to split a string, <CODE>false</CODE> otherwise
 */
    public boolean isSplitCharacter(int start, int current, int end, char[] cc, PdfChunk[] ck) {
        char c;
        if (ck == null)
            c = cc[current];
        else
            c = ck[Math.min(current, ck.length - 1)].getUnicodeEquivalent(cc[current]);
        if (c <= ' ' || c == '-') {
            return true;
        }
        if (c < 0x2e80)
            return false;
        return ((c >= 0x2e80 && c < 0xd7a0)
        || (c >= 0xf900 && c < 0xfb00)
        || (c >= 0xfe30 && c < 0xfe50)
        || (c >= 0xff61 && c < 0xffa0));
    }
    
    boolean isExtSplitCharacter(int start, int current, int end, char[] cc, PdfChunk[] ck) {
        return splitCharacter.isSplitCharacter(start, current, end, cc, ck);
    }
    
/**
 * Removes all the <VAR>' '</VAR> and <VAR>'-'</VAR>-characters on the right of a <CODE>String</CODE>.
 * <P>
 * @param	string		the <CODE>String<CODE> that has to be trimmed.
 * @return	the trimmed <CODE>String</CODE>
 */    
    String trim(String string) {
        BaseFont ft = font.getFont();
        if (ft.getFontType() == BaseFont.FONT_TYPE_CJK && ft.getUnicodeEquivalent(' ') != ' ') {
            while (string.endsWith("\u0001")) {
                string = string.substring(0, string.length() - 1);
            }
        }
        else {
            while (string.endsWith(" ") || string.endsWith("\t")) {
                string = string.substring(0, string.length() - 1);
            }
        }
        return string;
    }

    public boolean changeLeading() {
        return changeLeading;
    }
    
    float getCharWidth(char c) {
        if (noPrint(c))
            return 0;
        return font.width(c);
    }
    
    public static boolean noPrint(char c) {
        return ((c >= 0x200b && c <= 0x200f) || (c >= 0x202a && c <= 0x202e));
    }
    
}