package com.szallcom.tools;import java.awt.event.*;import java.awt.*;import java.awt.print.*;import javax.swing.*;import wf.common.SystemProperties;import java.awt.geom.*;public class PrintPreviewDialog extends JDialogimplements ActionListener{    private JButton nextButton = new JButton("Next");    private JButton previousButton = new JButton("Previous");    private JButton closeButton = new JButton("Close");    private JPanel buttonPanel = new JPanel();    private PreviewCanvas canvas;    public PrintPreviewDialog(Frame parent, String title, boolean modal, PrintTest pt, String str)    {        super(parent, title, modal);        canvas = new PreviewCanvas(pt, str);        setLayout();    }    private void setLayout()    {        this.getContentPane().setLayout(new BorderLayout());        this.getContentPane().add(canvas, BorderLayout.CENTER);        nextButton.setMnemonic('N');        nextButton.addActionListener(this);        buttonPanel.add(nextButton);        previousButton.setMnemonic('N');        previousButton.addActionListener(this);        buttonPanel.add(previousButton);        closeButton.setMnemonic('N');        closeButton.addActionListener(this);        buttonPanel.add(closeButton);        this.getContentPane().add(buttonPanel, BorderLayout.SOUTH);        this.setBounds((int)((SystemProperties.SCREEN_WIDTH - 400) / 2), (int)((SystemProperties.SCREEN_HEIGHT - 400) / 2), 400, 400);    }    public void actionPerformed(ActionEvent evt)    {        Object src = evt.getSource();        if (src == nextButton)            nextAction();        else if (src == previousButton)            previousAction();        else if (src == closeButton)            closeAction();    }    private void closeAction()    {        this.setVisible(false);        this.dispose();    }    private void nextAction()    {        canvas.viewPage(1);    }    private void previousAction()    {        canvas.viewPage(-1);    }    class PreviewCanvas extends JPanel    {        private String printStr;        private int currentPage = 0;        private PrintTest preview;        public PreviewCanvas(PrintTest pt, String str)        {            printStr = str;            preview = pt;        }        public void paintComponent(Graphics g)        {            super.paintComponent(g);            Graphics2D g2 = (Graphics2D)g;            PageFormat pf = PrinterJob.getPrinterJob().defaultPage();            double xoff;            double yoff;            double scale;            double px = pf.getWidth();            double py = pf.getHeight();            double sx = getWidth() - 1;            double sy = getHeight() - 1;            if (px / py < sx / sy)            {                scale = sy / py;                xoff = 0.5 * (sx - scale * px);                yoff = 0;            }            else            {                scale = sx / px;                xoff = 0;                yoff = 0.5 * (sy - scale * py);            }            g2.translate((float)xoff, (float)yoff);            g2.scale((float)scale, (float)scale);            Rectangle2D page = new Rectangle2D.Double(0, 0, px, py);            g2.setPaint(Color.white);            g2.fill(page);            g2.setPaint(Color.black);            g2.draw(page);            try            {                preview.print(g2, pf, currentPage);            }            catch(PrinterException pe)            {                g2.draw(new Line2D.Double(0, 0, px, py));                g2.draw(new Line2D.Double(0, px, 0, py));            }        }        public void viewPage(int pos)        {            int newPage = currentPage + pos;            if (0 <= newPage && newPage < preview.getPagesCount(printStr))            {                currentPage = newPage;                repaint();            }        }    }}