printabletextarea.java

java文本编辑器

import java.awt.*; 
import java.io.*; 
import java.awt.print.*; 

import javax.swing.*; 
import javax.swing.text.*; 

class PrintableTextArea extends JTextArea 
implements Printable { 

String str; 
Font font; 
PrinterJob pj; 
PageFormat defaultFormat; 
int visiblePageWidth = 0, visiblePageHeight = 0; 
final static int PageX = 10, PageY = 10; 

PrintableTextArea(int rows, int columns) { 
super(rows, columns); 
} 

public void printIt(String str, Font font) { 
this.str = str; 
this.font = font; 
pj = PrinterJob.getPrinterJob(); 
defaultFormat = pj.defaultPage(); 
pj.setPrintable(this, defaultFormat); 
visiblePageWidth = (int)defaultFormat.getImageableWidth(); 
visiblePageHeight = (int)defaultFormat.getImageableHeight(); 
if(pj.printDialog()) { 
try { 
pj.print(); 
} catch(PrinterException e) { 
} 
} 
} 

public int print(Graphics g, PageFormat pf, int page) throws PrinterException { 
if(page >= 1) 
return Printable.NO_SUCH_PAGE; 
Graphics2D g2 = (Graphics2D) g; 
g2.translate((int)pf.getImageableX(), (int)pf.getImageableY()); 
g2.setFont(font); 
int fontHeight = 0, fontStringWidth = 0; 
int line = 0; 
String s = null; 
FontMetrics fm = getFontMetrics(font); 
fontHeight = fm.getHeight(); 
try{ 
DataOutputStream osw = new DataOutputStream(new FileOutputStream("$temp.$$p")); 
osw.writeBytes(str); 
osw.close(); 
} catch(IOException e) { 
} 
try { 
BufferedReader br = new BufferedReader(new FileReader("$temp.$$p")); 
s = br.readLine(); 
while(s != null) { 
if(s.length() == 0) 
g2.drawString(" ", PageX, PageY + fontHeight*(line++)); 
else { 
//g2.drawString(s, PageX, PageY + fontHeight*(line++)); 
fontStringWidth = fm.stringWidth(s); 
if(fontStringWidth > visiblePageWidth) { 
String s1, s2; 
int goBack = 0; 
while( fm.stringWidth(s1 = s.substring(0, s.length() - goBack)) > 
visiblePageWidth) { 
goBack++; 
} 
s1 = s.substring(0, s.length() - goBack); 
s2 = s.substring(s.length() - goBack - 1); 
g2.drawString(s1, PageX, PageY + fontHeight*(line++)); 
g2.drawString(s2, PageX, PageY + fontHeight*(line++)); 
} 
else { 
g2.drawString(s, PageX, PageY + fontHeight*(line++)); 
} 
} 
s = br.readLine(); 
} 
br.close(); 
} catch(IOException e) { 
} 
return Printable.PAGE_EXISTS; 
} 

} 

/* other usefull functions 
PageFormat defaultFormat = pj.defaultPage(); 
defaultFormat.getImageableX(); 
defaultFormat.getImageableY(); 
defaultFormat.getWidth(); 
defaultFormat.getHeight(); 
defaultFormat.getImageableWidth(); 
defaultFormat.getImageableHeight(); 


PageFormat selectedFormat = pj.pageDialog(defaultFormat); 
selectFormat.getImageableX(); 
selectFormat.getImageableY(); 
selectFormat.getWidth(); 
selectFormat.getHeight(); 
selectFormat.getImageableWidth(); 
selectFormat.getImageableHeight(); 

stringWidth(String str) 

*/