SWT (JFace) printing function

The Demo code is as follows: Copy codeThe Code is as follows: package swt_jface.demo11;
Import org. eclipse. swt. graphics. GC;
Import org. eclipse. swt. printing. PrintDialog;
Import org. eclipse. swt. printing. Printer;
Import org. eclipse. swt. printing. PrinterData;
Import org. eclipse. swt. widgets. Display;
Import org. eclipse. swt. widgets. Shell;
Public class SimplePrint {
Display display = new Display ();
Shell shell = new Shell (display );
Public SimplePrint (){
Shell. pack ();
Shell. open ();
PrintDialog dialog = new PrintDialog (shell );
PrinterData printerData = dialog. open ();
If (printerData! = Null ){
Printer printer = new Printer (printerData );
If (printer. startJob ("Text ")){
GC gc = new GC (printer );
If (printer. startPage ()){
Gc. drawString ("Eclipse", 200,200 );
Printer. endPage ();
}
Gc. dispose ();
Printer. endJob ();
}
Printer. dispose ();
System. out. println ("Print job done .");
}
While (! Shell. isDisposed ()){
If (! Display. readAndDispatch ()){
Display. sleep ();
}
}
Display. dispose ();
}
Public static void main (String [] args ){
New SimplePrint ();
}
}

Add the print button to the General Main Menu:Copy codeThe Code is as follows: package swt_jface.demo11;
Import java. io. BufferedReader;
Import java. io. File;
Import java. io. FileInputStream;
Import java. io. FileNotFoundException;
Import java. io. IOException;
Import java. io. InputStreamReader;
Import java. io. Reader;
Import org. eclipse. jface. window. ApplicationWindow;
Import org. eclipse. jface. window. WindowManager;
Import org. eclipse. swt. SWT;
Import org. eclipse. swt. custom. StyledText;
Import org. eclipse. swt. custom. StyledTextPrintOptions;
Import org. eclipse. swt. events. SelectionAdapter;
Import org. eclipse. swt. events. SelectionEvent;
Import org. eclipse. swt. graphics. Color;
Import org. eclipse. swt. graphics. Font;
Import org. eclipse. swt. graphics. FontData;
Import org. eclipse. swt. graphics. GC;
Import org. eclipse. swt. graphics. Point;
Import org. eclipse. swt. graphics. RGB;
Import org. eclipse. swt. graphics. Rectangle;
Import org. eclipse. swt. layout. FillLayout;
Import org. eclipse. swt. printing. PrintDialog;
Import org. eclipse. swt. printing. Printer;
Import org. eclipse. swt. printing. PrinterData;
Import org. eclipse. swt. widgets. ColorDialog;
Import org. eclipse. swt. widgets. Display;
Import org. eclipse. swt. widgets. FileDialog;
Import org. eclipse. swt. widgets. FontDialog;
Import org. eclipse. swt. widgets. Menu;
Import org. eclipse. swt. widgets. MenuItem;
Import org. eclipse. swt. widgets. MessageBox;
Import org. eclipse. swt. widgets. Shell;
Import org. eclipse. swt. widgets. Text;
Public class Main {

ApplicationWindow applicationWindow;
WindowManager manager;

StyledTextPrintOptions styledTextPrintOptions;
StyledText styledText;

Display display;
Shell shell;
Text text;
Font font;
Color foregroundColor, backgroundColor;

Printer printer;
GC;
Font printerFont;
Color printerForegroundColor, printerBackgroundColor;
Int lineHeight = 0;
Int tabWidth = 0;
Int leftMargin, rightMargin, topMargin, bottomMargin;
Int x, y;
Int index, end;
String textToPrint;
String tabs;
StringBuffer wordBuffer;
Public static void main (String [] args ){
New Main (). open ();
}

Void open (){
Display = new Display ();
Font = new Font (display, "Courier", 10, SWT. NORMAL );
ForegroundColor = display. getSystemColor (SWT. COLOR_BLACK );
BackgroundColor = display. getSystemColor (SWT. COLOR_WHITE );
Shell = new Shell (display );
Shell. setLayout (new FillLayout ());
Shell. setText ("Print Text ");
Shell. setMaximized (true );
Text = new Text (shell, SWT. BORDER | SWT. MULTI | SWT. V_SCROLL | SWT. H_SCROLL );
Text. setFont (font );
Text. setForeground (foregroundColor );
Text. setBackground (backgroundColor );

Menu menuBar = new Menu (shell, SWT. BAR );
Shell. setMenuBar (menuBar );
MenuItem item = new MenuItem (menuBar, SWT. CASCADE );
Item. setText ("& File ");
Menu fileMenu = new Menu (shell, SWT. DROP_DOWN );
Item. setMenu (fileMenu );
Item = new MenuItem (fileMenu, SWT. PUSH );
Item. setText ("& Open ...");
Item. setAccelerator (SWT. CTRL + 'O ');
Item. addSelectionListener (new SelectionAdapter (){
Public void widgetSelected (SelectionEvent event ){
MenuOpen ();
}
});
Item = new MenuItem (fileMenu, SWT. PUSH );
Item. setText ("Font ...");
Item. addSelectionListener (new SelectionAdapter (){
Public void widgetSelected (SelectionEvent event ){
MenuFont ();
}
});
Item = new MenuItem (fileMenu, SWT. PUSH );
Item. setText ("Foreground Color ...");
Item. addSelectionListener (new SelectionAdapter (){
Public void widgetSelected (SelectionEvent event ){
MenuForegroundColor ();
}
});
Item = new MenuItem (fileMenu, SWT. PUSH );
Item. setText ("Background Color ...");
Item. addSelectionListener (new SelectionAdapter (){
Public void widgetSelected (SelectionEvent event ){
MenuBackgroundColor ();
}
});
Item = new MenuItem (fileMenu, SWT. PUSH );
Item. setText ("& Print ...");
Item. setAccelerator (SWT. CTRL + 'P ');
Item. addSelectionListener (new SelectionAdapter (){
Public void widgetSelected (SelectionEvent event ){
MenuPrint ();
}
});
New MenuItem (fileMenu, SWT. SEPARATOR );
Item = new MenuItem (fileMenu, SWT. PUSH );
Item. setText ("E & xit ");
Item. addSelectionListener (new SelectionAdapter (){
Public void widgetSelected (SelectionEvent event ){
System. exit (0 );
}
});

Shell. pack ();
Shell. open ();
While (! Shell. isDisposed ()){
If (! Display. readAndDispatch () display. sleep ();
}
If (font! = Null) font. dispose ();
If (foregroundColor! = Null) foregroundColor. dispose ();
If (backgroundColor! = Null) backgroundColor. dispose ();
}

Void menuOpen (){
Final String textString;
FileDialog dialog = new FileDialog (shell, SWT. OPEN );
Dialog. setFilterExtensions (new String [] {"*. java ","*.*"});
String name = dialog. open ();
If (name = null) | (name. length () = 0) return;

Try {
File file = new File (name );
FileInputStream stream = new FileInputStream (file. getPath ());
Try {
Reader in = new BufferedReader (new InputStreamReader (stream ));
Char [] readBuffer = new char [2048];
StringBuffer buffer = new StringBuffer (int) file. length ());
Int n;
While (n = in. read (readBuffer)> 0 ){
Buffer. append (readBuffer, 0, n );
}
TextString = buffer. toString ();
Stream. close ();
} Catch (IOException e ){
MessageBox box = new MessageBox (shell, SWT. ICON_ERROR );
Box. setMessage ("Error reading file: \ n" + name );
Box. open ();
Return;
}
} Catch (FileNotFoundException e ){
MessageBox box = new MessageBox (shell, SWT. ICON_ERROR );
Box. setMessage ("File not found: \ n" + name );
Box. open ();
Return;
}
Text. setText (textString );
}
Void menuFont (){
FontDialog fontDialog = new FontDialog (shell );
FontDialog. setFontList (font. getFontData ());
FontData fontData = fontDialog. open ();
If (fontData! = Null ){
If (font! = Null) font. dispose ();
Font = new Font (display, fontData );
Text. setFont (font );
}
}
Void menuForegroundColor (){
ColorDialog colorDialog = new ColorDialog (shell );
ColorDialog. setRGB (foregroundColor. getRGB ());
RGB rgb = colorDialog. open ();
If (rgb! = Null ){
If (foregroundColor! = Null) foregroundColor. dispose ();
ForegroundColor = new Color (display, rgb );
Text. setForeground (foregroundColor );
}
}
Void menuBackgroundColor (){
ColorDialog colorDialog = new ColorDialog (shell );
ColorDialog. setRGB (backgroundColor. getRGB ());
RGB rgb = colorDialog. open ();
If (rgb! = Null ){
If (backgroundColor! = Null) backgroundColor. dispose ();
BackgroundColor = new Color (display, rgb );
Text. setBackground (backgroundColor );
}
}
Void menuPrint (){
PrintDialog dialog = new PrintDialog (shell, SWT. NULL );
PrinterData data = dialog. open ();
If (data = null) return;
If (data. printToFile ){
Data. fileName = "print. out ";
}

TextToPrint = text. getText ();
Printer = new Printer (data );
Thread printingThread = new Thread ("Printing "){
Public void run (){
Print (printer );
Printer. dispose ();
}
};
PrintingThread. start ();
}

Void print (Printer printer ){
If (printer. startJob ("Text ")){
Rectangle clientArea = printer. getClientArea ();
Rectangle trim = printer. computeTrim (0, 0, 0, 0 );
Point dpi = printer. getDPI ();
LeftMargin = dpi. x + trim. x;
RightMargin = clientArea. width-dpi. x + trim. x + trim. width;
TopMargin = dpi. y + trim. y;
BottomMargin = clientArea. height-dpi. y + trim. y + trim. height;

Int tabSize = 4;
StringBuffer tabBuffer = new StringBuffer (tabSize );
For (int I = 0; I <tabSize; I ++) tabBuffer. append ('');
Tabs = tabBuffer. toString ();
Gc = new GC (printer );

FontData fontData = font. getFontData () [0];
PrinterFont = new Font (printer, fontData. getName (), fontData. getHeight (), fontData. getStyle ());
Gc. setFont (printerFont );
TabWidth = gc. stringExtent (tabs). x;
LineHeight = gc. getFontMetrics (). getHeight ();

RGB rgb = foregroundColor. getRGB ();
PrinterForegroundColor = new Color (printer, rgb );
Gc. setForeground (printerForegroundColor );

Rgb = backgroundColor. getRGB ();
PrinterBackgroundColor = new Color (printer, rgb );
Gc. setBackground (printerBackgroundColor );

PrintText ();
Printer. endJob ();
PrinterFont. dispose ();
PrinterForegroundColor. dispose ();
PrinterBackgroundColor. dispose ();
Gc. dispose ();
}
}

Void printText (){
Printer. startPage ();
WordBuffer = new StringBuffer ();
X = leftMargin;
Y = topMargin;
Index = 0;
End = textToPrint. length ();
While (index <end ){
Char c = textToPrint. charAt (index );
Index ++;
If (c! = 0 ){
If (c = 0x0a | c = 0x0d ){
If (c = 0x0d & index <end & textToPrint. charAt (index) = 0x0a ){
Index ++;
}
PrintWordBuffer ();
Newline ();
} Else {
If (c! = '\ T '){
WordBuffer. append (c );
}
If (Character. isWhitespace (c )){
PrintWordBuffer ();
If (c = '\ t '){
X + = tabWidth;
}
}
}
}
}
If (y + lineHeight <= bottomMargin ){
Printer. endPage ();
}
}
Void printWordBuffer (){
If (wordBuffer. length ()> 0 ){
String word = wordBuffer. toString ();
Int wordWidth = gc. stringExtent (word). x;
If (x + wordWidth> rightMargin ){
Newline ();
}
Gc. drawString (word, x, y, false );
X + = wordWidth;
WordBuffer = new StringBuffer ();
}
}
Void newline (){
X = leftMargin;
Y + = lineHeight;
If (y + lineHeight> bottomMargin ){
Printer. endPage ();
If (index + 1 <end ){
Y = topMargin;
Printer. startPage ();
}
}
}
}