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SWT(JFace) 打印功能

时间：2022-08-23 22:57 编辑：来源：阅读：
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摘要：SWT(JFace) 打印功能

演示代码如下：

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();
            }
            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();
    }
}

常规Main菜单加入打印按钮：

[u]复制代码[/u] 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);
        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();
            }
        }
    }
}

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