printpreview.java

外国人写的Java打印程序

package printtable;

import java.awt.*;
import java.awt.event.*;
import java.awt.print.*;

import javax.swing.*;

/**
 * Title:        PrintTable
 * Description:  A java jTable Print Programme.
 * Enable set the wighth and highth.
 * Copyright:    Copyright (c) 2002
 * Company:      TopShine
 * @author ghostliang
 * @version 1.0
 */

public class PrintPreview extends JPanel{
  protected Pageable pageable;
  protected int pageIndex;

//declare component
//*************************************************************
  BorderLayout thisLayout = new BorderLayout();

  JPanel mainPanel = new JPanel();
  BorderLayout mainPanelLayout = new BorderLayout();

  JPanel previewPanel = new JPanel();
  BorderLayout previewPanelLayout = new BorderLayout();
  JScrollPane previewScroll = new JScrollPane();
  PrintComponent printComponent;

  JPanel controlPanel = new JPanel();
  FlowLayout controlPanelLayout = new FlowLayout();

  JButton bPreviousPage = new JButton();
  JButton bNextPage = new JButton();
  JTextField tScale = new JTextField(3);
  JButton bFitToPage = new JButton();
  JButton bPrint = new JButton();

  JPanel leftPanel = new JPanel();
  JPanel rightPanel = new JPanel();
  JPanel topPanel = new JPanel();
  JLabel lPage = new JLabel();
//*************************************************************

  //init PrintPreview with pageable and page
  public PrintPreview(Pageable newPageable,int page) {
    try {
      pageable = newPageable;
      pageIndex = page;

      printComponent = new PrintComponent(null,null);
      jbInit();

      displayPage(pageIndex);
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  //layout the component
  private void jbInit() throws Exception {
    this.setLayout(thisLayout);

    lPage.setText("0");
    this.add(mainPanel,BorderLayout.CENTER);
    this.add(topPanel, BorderLayout.NORTH);
    topPanel.add(lPage, null);
    this.add(leftPanel, BorderLayout.WEST);
    this.add(rightPanel, BorderLayout.EAST);

    mainPanel.setLayout(mainPanelLayout);

    mainPanel.add(controlPanel, BorderLayout.SOUTH);
    mainPanel.add(previewPanel, BorderLayout.CENTER);

    previewPanel.setLayout(previewPanelLayout);
    previewPanel.add(previewScroll, BorderLayout.CENTER);

    previewScroll.getViewport().add(printComponent, null);

    controlPanel.setLayout(controlPanelLayout);

    controlPanel.add(bPrint, null);
    controlPanel.add(bPreviousPage, null);
    controlPanel.add(bNextPage, null);
    controlPanel.add(tScale, null);
    controlPanel.add(bFitToPage, null);

    bPreviousPage.setText("Previous");
    bPreviousPage.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        bPreviousPage_actionPerformed(e);
      }
    });

    //actions fot the component
    bNextPage.setText("Next");
    bNextPage.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        bNextPage_actionPerformed(e);
      }
    });

    tScale.addKeyListener(new java.awt.event.KeyAdapter() {
      public void keyReleased(KeyEvent e) {
        tScale_keyReleased(e);
      }
    });

    bFitToPage.setText("Fit To Page");
    bFitToPage.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        bFitToPage_actionPerformed(e);
      }
    });

    bPrint.setText("PrintAll");
    bPrint.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        bPrint_actionPerformed(e);
      }
    });
  }

  void bPreviousPage_actionPerformed(ActionEvent e) {
    displayPage(pageIndex - 1);
  }

  void bNextPage_actionPerformed(ActionEvent e) {
    displayPage(pageIndex + 1);
  }

  void tScale_keyReleased(KeyEvent e) {
    try
    {
      int scale = Integer.parseInt(tScale.getText());
      printComponent.setScaleFactor(scale);
      repaint();
    }
    catch(NumberFormatException nfe)
    {
    }
  }

  protected void displayPage(int index)
  {
    pageIndex = index;
    printComponent.setPrintabel(pageable.getPrintable(pageIndex));
    printComponent.setPageFormat(pageable.getPageFormat(pageIndex));
    printComponent.setDisplayPage(pageIndex);
    bPreviousPage.setEnabled(pageIndex > 0);
    bNextPage.setEnabled(pageIndex < (pageable.getNumberOfPages() - 1));

    lPage.setText("NO: " + (index + 1) + " of Total " + pageable.getNumberOfPages());
    repaint();
  }

  void bFitToPage_actionPerformed(ActionEvent e) {
    fitToPage();
  }

  protected void fitToPage()
  {
    int newScaleFactor;
    Dimension compSize = printComponent.getSizeWithScale(100);
    Dimension viewSize = previewScroll.getSize();

    int scaleX = (viewSize.width - 25) * 100 / compSize.width;
    int scaleY = (viewSize.height - 25) * 100 / compSize.height;

    newScaleFactor = Math.min(scaleX,scaleY);

    printComponent.setScaleFactor(newScaleFactor);
    tScale.setText(Integer.toString(newScaleFactor));
    repaint();
  }

  void bPrint_actionPerformed(ActionEvent e) {
    PrintMonitor printMonitor = new PrintMonitor(pageable,"ghostliang");
    try
    {
      printMonitor.performPrint(false);
    }
    catch(PrinterException pe)
    {
     JOptionPane.showMessageDialog(null,"Print Error:" + pe.getMessage());
    }
  }
}