PrintableText.java

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import java.io.*;
import java.text.*;
import java.awt.font.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.print.*;
import javax.swing.text.*;

public class PrintableText implements Printable {
    AttributedString text;
    
    public PrintableText(String _text, Font font) {
        text = new AttributedString(_text);
        if (_text.length()>0)
            text.addAttribute(TextAttribute.FONT, font);
    }
    
    public PrintableText(AttributedString _text) {
        text = _text;
    }
    
    public int print(Graphics g, PageFormat format, int page) {
        Graphics2D g2 = (Graphics2D)g;
        //g2.setTransform(new AffineTransform(format.getMatrix()));
        if (printPage(g2,page,
                      format.getImageableX(),format.getImageableY(),
                      format.getImageableWidth(),format.getImageableHeight()))
            return PAGE_EXISTS;
        else
            return NO_SUCH_PAGE;    
    }
    
    int currentPage;
    boolean endOfDocument;
    TextLayout lineLayout;
    int paragraph;
    CharacterIterator paragraphIterator;
    LineBreakMeasurer lineBreak;
    
    int prev_currentPage = -1;
    boolean prev_endOfDocument;
    TextLayout prev_lineLayout;
    int prev_paragraph;
    CharacterIterator prev_paragraphIterator;
    int totalPageNum = -1;
    LineBreakMeasurer prev_lineBreak;
    int prev_lineBreakPos;

    class Previewer {
        int previewPage = 0;
        PageFormat previewFormat;
        JPanel sheet;
        JTextField pageNum;
        JLabel totalPageNumField;
        JFrame frame;
        JButton prev, next, first, last;

        void checkPage() {
            if (previewPage<0) previewPage = 0;
            if (totalPageNum!=-1 && previewPage>=totalPageNum) previewPage = totalPageNum-1;
            pageNum.setText(Integer.toString(previewPage+1));
            if (totalPageNum!=-1) {
                totalPageNumField.setText(" of "+Integer.toString(totalPageNum));
                totalPageNumField.setVisible(true); }
            prev.setEnabled(previewPage>0);
            next.setEnabled(totalPageNum==-1 || previewPage<totalPageNum-1);
            first.setEnabled(previewPage>0);
            last.setEnabled(totalPageNum==-1 || previewPage<totalPageNum-1);
            pageNum.setEnabled(totalPageNum!=0 && totalPageNum!=1);
            sheet.repaint();
        }
        
        Previewer(JFrame _frame, PageFormat format) {
            frame = _frame;
            previewFormat = format;
            sheet = new JPanel() {
                    public void paintComponent(Graphics g) {
                        Graphics2D g2 = (Graphics2D)g;
                        Color oldColor = g2.getColor();
                        g2.setColor(Color.white);
                        g2.fillRect(0,0,
                                    (int)previewFormat.getWidth(),
                                    (int)previewFormat.getHeight());
                        g2.setColor(oldColor);
                        int oldTotalPageNum = totalPageNum;
                        if (previewPage<0 || !printPage(g2,previewPage,
                                                        previewFormat.getImageableX(),
                                                        previewFormat.getImageableY(),
                                                        previewFormat.getImageableWidth(),
                                                        previewFormat.getImageableHeight())) {
                            g2.setColor(Color.gray);
                            Rectangle r = g2.getClipBounds();
                            g2.fillRect(r.x,r.y,r.width,r.height);
                            g2.setColor(oldColor);
                        }
                        if (oldTotalPageNum!=totalPageNum) checkPage();
                    }};
            Dimension sheetSize = 
                new Dimension((int)format.getWidth(),(int)format.getHeight());
            sheet.setPreferredSize(sheetSize);
            JPanel buttons = new JPanel();
            frame.getContentPane().add("Center",sheet);
            frame.getContentPane().add("South",buttons);
            first = new JButton("<<");
            first.setEnabled(false);
            first.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        previewPage = 0;
                        checkPage();
                    }});
            prev = new JButton("<");
            prev.setEnabled(false);
            prev.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        previewPage--;
                        checkPage();
                    }});
            next = new JButton(">");
            next.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        previewPage++;
                        checkPage();
                    }});
            last = new JButton(">>");
            last.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        if (totalPageNum!=-1) previewPage=totalPageNum-1;
                        else previewPage += 1000000;
                        checkPage();
                    }});
            pageNum = new JTextField(3);
            pageNum.setText("1");
            pageNum.addActionListener(new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        try {
                            System.out.println("PN "+pageNum.getText());
                            previewPage = Integer.parseInt(pageNum.getText())-1;
                        } catch (NumberFormatException ex) {};
                        checkPage();
                    }});
            pageNum.setMaximumSize(pageNum.getPreferredSize());
            pageNum.setMinimumSize(pageNum.getPreferredSize());
            totalPageNumField = new JLabel(" of ??");
            //totalPageNumField.setVisible(false);
            //totalPageNumField.setEditable(false);
            //totalPageNumField.setText("??");
            frame.addKeyListener(new KeyListener() {
                    public void keyTyped(KeyEvent e) {};
                    public void keyPressed(KeyEvent e) {};
                    public void keyReleased (KeyEvent e) {
                        switch (e.getKeyCode()) {
                        case KeyEvent.VK_PAGE_DOWN:
                            previewPage++; checkPage(); break;
                        case KeyEvent.VK_PAGE_UP:
                            previewPage--; checkPage(); break;
                        case KeyEvent.VK_HOME:
                            previewPage=0; checkPage(); break;
                        case KeyEvent.VK_END:
                            if (totalPageNum!=-1) previewPage=totalPageNum-1;
                            else previewPage += 100000000;
                            checkPage(); break;
                        case KeyEvent.VK_ESCAPE:
                            frame.setVisible(false); break;
                        }}});

            buttons.add(first);
            buttons.add(prev);

            buttons.add(Box.createHorizontalStrut((int)(pageNum.getPreferredSize().getWidth()/2)));

            buttons.add(pageNum);
            buttons.add(totalPageNumField);

            buttons.add(Box.createHorizontalStrut((int)(pageNum.getPreferredSize().getWidth()/2)));

            buttons.add(next);
            buttons.add(last);
            
            frame.pack();
            frame.setState(Frame.NORMAL);
            frame.setVisible(true);
        }
    }

    /*    public static Box.Filler createThickGlue(int width, int height) {
        return new Box.Filler(new Dimension(0,0),new Dimension(width,height),
                              new Dimension(32767,32767));
                              }*/

    public JFrame showPreview(JFrame frame, PageFormat format) {
        if (frame==null)
            frame = new JFrame("Print preview");
        else
            frame.getContentPane().removeAll();
        new Previewer(frame,format);
        return frame;
    }

    
    public boolean printPage(Graphics2D gfx, int page,
                             double x0, double y0,
                             double width, double height) {
        if (page<0) 
            throw new IllegalArgumentException("page = "+page+" < 0");
        if (prev_currentPage==page) {
            currentPage = prev_currentPage;
            endOfDocument = prev_endOfDocument;
            lineLayout = prev_lineLayout;
            paragraph = prev_paragraph;
            if (prev_paragraphIterator!=null)
                paragraphIterator = (CharacterIterator)prev_paragraphIterator.clone();
            else
                paragraphIterator = null;
            lineBreak = prev_lineBreak;
            if (lineBreak!=null) lineBreak.setPosition(prev_lineBreakPos);
        } else {
            prev_currentPage = currentPage;
            prev_endOfDocument = endOfDocument;
            prev_lineLayout = lineLayout;
            prev_paragraph = paragraph;
            if (paragraphIterator!=null)
                prev_paragraphIterator = (CharacterIterator)paragraphIterator.clone();
            else
                prev_paragraphIterator = null;
            prev_lineBreak = lineBreak;
            if (prev_lineBreak!=null) prev_lineBreakPos = prev_lineBreak.getPosition();
        }
        if (currentPage>page || paragraphIterator==null) {
            paragraphIterator = text.getIterator();
            paragraph = 0;
            currentPage = 0; endOfDocument = false; 
            lineLayout = null; lineBreak = null;
        }
        if (endOfDocument) return false;
        boolean pageEmpty = true;
        while (currentPage<=page) {
            double x = x0, y = y0;
            while (true) {
                if (lineLayout==null) {
                    if (lineBreak==null) {
                        int start = paragraph;

                        if (paragraphIterator.current()==CharacterIterator.DONE) {
                            endOfDocument = true; currentPage++;
                            totalPageNum = pageEmpty?(currentPage-1):currentPage;
                            return !pageEmpty && currentPage-1==page; };
                        while (true) {
                            char c = paragraphIterator.current();
                            //System.out.println("C "+c+"  T "+t);
                            paragraph++;
                            if (paragraphIterator.next()==CharacterIterator.DONE) break;
                            int t = Character.getType(c);
                            if (t==Character.LINE_SEPARATOR ||
                                t==Character.PARAGRAPH_SEPARATOR || c=='\n') break;
                        }
                            
                        lineBreak = new LineBreakMeasurer
                            (text.getIterator(null,start,paragraph),
                             gfx.getFontRenderContext());
                             //new FontRenderContext(null,false,false));
                    }

                    lineLayout = lineBreak.nextLayout((float)width);
                    //System.out.println("LineLayoyt: "+lineLayout);
                    if (lineLayout==null) {
                        lineBreak = null; continue; }
                }

                y += lineLayout.getAscent();

                if (!pageEmpty && y+lineLayout.getDescent() > height) break;

                double dx = lineLayout.isLeftToRight()?0:
                    (width-lineLayout.getAdvance());
                if (currentPage==page)
                    lineLayout.draw(gfx,(float)(x+dx),(float)y);
                y += lineLayout.getDescent()+lineLayout.getLeading();
                lineLayout = null;

                pageEmpty = false;
            }
            currentPage++;
        }
        return true;
    }
}

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