SWT(JFace) 打印功能

演示代码如下：

复制代码 代码如下:

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();

            }

            printyJmSmer.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();

    }

}

常规Main菜单加入打印按钮：

复制代码 代码如下:

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 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);

        backgroundColwww.devze.comor = 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);

  yJmSm      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 MenuIt开发者_开发学习em(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("&Pr编程客栈int...");

        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);

   &nbshttp://www.devze.comp;    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();

            }

        }

    }

}