print.html

jdbc书

    g2.setColor(Color.black);
    paint(g2);
    return Printable.PAGE_EXISTS;
   }
</PRE><FONT FACE="Verdana, Arial, Helvetica">

<BLOCKQUOTE>
<STRONG><FONT COLOR=PURPLE>Note:</FONT></STRONG>
The printing Graphics2D is based on the <code>BufferedImage</code> class and
on some platforms does not default to a foreground color of black. If
this is the case on your platform, you have to add 
<code>g2.setColor(Color.black)</code> to the <code>print</code> method 
before the <code>paint</code> invocation.
</BLOCKQUOTE>

<H3>Printing a Swing Component</H3>

<IMG SRC="./Art/swbutton.gif" ALIGN=LEFT>
Printing a Swing component is almost the same as printing an AWT
component, except the <code>MyButton</code> subclass does not 
need a <code>paint</code> method implementation. It does, however, have 
a <code>print</code> method that calls the <CODE>paint</CODE>
method for the component. The <code>paint</code> method implementation
is not needed because Swing components know how to paint themselves. 
<P>
Here 
is the complete <A HREF="./Code/Swing/printbutton.java">printbutton.java</A>
source code for Swing.

</FONT><PRE>
class MyButton extends JButton implements Printable {

  public MyButton() {
    super("MyButton");
  }

  public int print(Graphics g, PageFormat pf, int pi)
                                throws PrinterException {
    if (pi >= 1) {
      return Printable.NO_SUCH_PAGE;
    }

    Graphics2D g2 = (Graphics2D) g;
    g2.translate(pf.getImageableX(), pf.getImageableY());
    Font  f = new Font("Monospaced", Font.PLAIN,12);
    g2.setFont (f);
    paint(g2);
    return Printable.PAGE_EXISTS;
   }
</PRE><FONT FACE="Verdana, Arial, Helvetica">

If you extend a <code>JPanel</code> and implement <code>Printable</code>,
you can print a panel component and all of its contents.  

</FONT><PRE>
public class printpanel extends JPanel 
			implements ActionListener, Printable {
</PRE><FONT FACE="Verdana, Arial, Helvetica">

Here is
the <A HREF="./Code/Swing/printpanel.java">printpanel.java</A> code
that prints a <code>JPanel</code> object and the <code>JButton</code>
it contains, and the 
<A HREF="./Code/Swing/ComponentPrinterFrame.java">ComponentPrinterFrame.java</A>
code that prints a <code>JFrame</code> object and the 
<code>JButton</code>, <code>JList</code>, <code>JCheckBox</code>,
and <code>JComboBox</code> components it contains.


<H3>Printing Graphics in Swing</H3>

In the same way the AWT example subclassed a <code>Button</code>
component and implemented the <code>paint</code> method to
draw the button, you can subclass an AWT or Swing component and implement 
the <code>paint</code> method to render 2D graphics to the screen or printer.
The <A HREF="./Code/Swing/ShapesPrint.java">ShapesPrint.java"</A> 
Swing application borrowed from 
<A HREF="http://java.sun.com/docs/books/tutorial/index.html">The Java Tutorial</A>
shows how this is done.  It is modified for this article to include
a <code>TextLayout</code> object.
<P>
<IMG SRC="./Art/shapes.gif">
<P>
The <code>paintComponent</code> method calls the <code>drawShapes</code> 
method to render the 2D graphics to the screen when the application starts.  
When you click the <code>Print</code> button, a printer graphics context 
is created and passed to the <code>drawShapes</code> method for printing.

<H3>Print Dialog</H3>

It is easy to display a Print dialog
so the end user can interactively change the print job
properties.  The <code>actionPerformed</code> method of
the previous Swing example is modified here
to do just that.
<P>
<IMG SRC="./Art/dialog.gif">
<P>

</FONT><PRE>
public void actionPerformed(ActionEvent e) {
  PrinterJob printJob = PrinterJob.getPrinterJob();
  printJob.setPrintable((MyButton) e.getSource());
  if(printJob.printDialog()){
    try { printJob.print(); } 
    catch (Exception PrinterExeption) { }
  }
}
</PRE><FONT FACE="Verdana, Arial, Helvetica">

<BLOCKQUOTE>
<STRONG><FONT COLOR=PURPLE>Note:</FONT></STRONG>In Swing, the 
<code>printJob.setPageable((MyButton) e.getSource());</code>
statement can be written as
<code>printJob.setPrintable((MyButton) e.getSource());</code>. The
difference is <code>setPrintable</code> is for applications that
do not know the number of pages they are printing.  
If you use <code>setPrintable</code>, you need to add 
<code>if(pi >= 1){ return Printable.NO_SUCH_PAGE: }</code>
to the beginnig of the <code>print</code> method.
</BLOCKQUOTE>

<H3>Page Setup Dialog</H3>

You can add a line of code that tells the <code>PrinterJob</code> object
to display a Page dialog so the end user can interactively modify the 
page format for printing in portrait, landscape, or reverse landscape mode.
The <code>actionPerformed</code> method of the previous Swing example is 
modified here to display Page and Print dialogs.
<P>
<BLOCKQUOTE>
<STRONG><FONT COLOR=PURPLE>Note:</FONT></STRONG> Some platforms
do not support a page dialog. On those platforms, the <code>pageDialog</code>
call simply returns the passed-in <code>PageFormat</code> object
and no dialog appears.
</BLOCKQUOTE>

</FONT><PRE>
public void actionPerformed(ActionEvent e) {
  PrinterJob printJob = PrinterJob.getPrinterJob();
  printJob.setPrintable((MyButton) e.getSource());
  PageFormat pf = printJob.pageDialog(printJob.defaultPage());
  if(printJob.printDialog()){
    try { printJob.print(); } catch (Exception ex) { }
  }
}
</PRE><FONT FACE="Verdana, Arial, Helvetica">

<H3>Printing a Collection of Pages</H3>

You can use the <code>Book</code> class to print a collection
of pages that you append to the book. The pages can be in any order 
and have different page formats.
<P>
<IMG SRC="./Art/print2.gif" ALIGN=LEFT>
The <A HREF="./Code/Swing/print2button.java">print2button.java</A>
example puts the <code>Print</code> and <code>Print 2</code> buttons of 
type <code>MyButton</code> on a panel. 
It creates a book that contains the pages to print.
When you click either button, the book prints one copy of the 
<code>Print</code> button in
landscape mode and two copies of the <code>Print 2</code> button
in portrait more, as specified in the <code>actionPerformed</code> 
method implementation shown here.

<BLOCKQUOTE>
<HR>
<STRONG>Note:</STRONG>
Currently a bug restricts the Solaris platform to
only print in portrait mode.
<HR>
</BLOCKQUOTE>

</FONT><PRE>
public void actionPerformed(ActionEvent e) {
  PrinterJob printJob = PrinterJob.getPrinterJob();

/* Set up Book */
  PageFormat landscape = printJob.defaultPage();
  PageFormat portrait = printJob.defaultPage();
  landscape.setOrientation(PageFormat.LANDSCAPE);
  portrait.setOrientation(PageFormat.PORTRAIT);
  Book bk = new Book();
  bk.append((Printable)b, landscape);
  bk.append((Printable)b2, portrait, 2);
  printJob.setPageable(bk);

  try { printJob.print(); } catch (Exception ex) { }
}
</PRE><FONT FACE="Verdana, Arial, Helvetica">


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