Swing组件的打印

 打印功能的实现

Vista.java

import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.geom.Point2D; import java.awt.print.PageFormat; import java.awt.print.Pageable; import java.awt.print.Printable; import java.awt.print.PrinterException; import java.awt.print.PrinterGraphics; /** * A simple Pageable class that can split a large drawing canvas over multiple * pages. * * The pages in a canvas are laid out on pages going left to right and then top * to bottom. */ public class Vista implements Pageable { private int mNumPagesX; private int mNumPagesY; private int mNumPages; private Printable mPainter; private PageFormat mFormat; /** * Create a java.awt.Pageable that will print a canvas over as many pages as * are needed. A Vista can be passed to PrinterJob.setPageable. * * @param width * The width, in 1/72nds of an inch, of the vist's canvas. * * @param height * The height, in 1/72nds of an inch, of the vista's canvas. * * @param painter * The object that will drawn the contents of the canvas. * * @param format * The description of the pages on to which the canvas will be * drawn. */ public Vista(float width, float height, Printable painter, PageFormat format) { setPrintable(painter); setPageFormat(format); setSize(width, height); } /** * Create a vista over a canvas whose width and height are zero and whose * Printable and PageFormat are null. */ protected Vista() { } /** * Set the object responsible for drawing the canvas. */ protected void setPrintable(Printable painter) { mPainter = painter; } /** * Set the page format for the pages over which the canvas will be drawn. */ protected void setPageFormat(PageFormat pageFormat) { mFormat = pageFormat; } /** * Set the size of the canvas to be drawn. * * @param width * The width, in 1/72nds of an inch, of the vist's canvas. * * @param height * The height, in 1/72nds of an inch, of the vista's canvas. */ protected void setSize(float width, float height) { mNumPagesX = (int) ((width + mFormat.getImageableWidth() - 1) / mFormat .getImageableWidth()); mNumPagesY = (int) ((height + mFormat.getImageableHeight() - 1) / mFormat .getImageableHeight()); mNumPages = mNumPagesX * mNumPagesY; } /** * Returns the number of pages over which the canvas will be drawn. */ public int getNumberOfPages() { return mNumPages; } protected PageFormat getPageFormat() { return mFormat; } /** * Returns the PageFormat of the page specified by pageIndex. For a Vista * the PageFormat is the same for all pages. * * @param pageIndex * the zero based index of the page whose PageFormat is being * requested * @return the PageFormat describing the size and orientation. * @exception IndexOutOfBoundsException * the Pageable does not contain the requested page. */ public PageFormat getPageFormat(int pageIndex) throws IndexOutOfBoundsException { if (pageIndex >= mNumPages) { throw new IndexOutOfBoundsException(); } return getPageFormat(); } /** * Returns the <code>Printable</code> instance responsible for rendering the * page specified by <code>pageIndex</code>. In a Vista, all of the pages * are drawn with the same Printable. This method however creates a * Printable which calls the canvas's Printable. This new Printable is * responsible for translating the coordinate system so that the desired * part of the canvas hits the page. * * The Vista's pages cover the canvas by going left to right and then top to * bottom. In order to change this behavior, override this method. * * @param pageIndex * the zero based index of the page whose Printable is being * requested * @return the Printable that renders the page. * @exception IndexOutOfBoundsException * the Pageable does not contain the requested page. */ public Printable getPrintable(int pageIndex) throws IndexOutOfBoundsException { if (pageIndex >= mNumPages) { throw new IndexOutOfBoundsException(); } double originX = (pageIndex % mNumPagesX) * mFormat.getImageableWidth(); double originY = (pageIndex / mNumPagesX) * mFormat.getImageableHeight(); Point2D.Double origin = new Point2D.Double(originX, originY); return new TranslatedPrintable(mPainter, origin); } /** * This inner class's sole responsibility is to translate the coordinate * system before invoking a canvas's painter. The coordinate system is * translated in order to get the desired portion of a canvas to line up * with the top of a page. */ public static final class TranslatedPrintable implements Printable { /** * The object that will draw the canvas. */ private Printable mPainter; /** * The upper-left corner of the part of the canvas that will be * displayed on this page. This corner is lined up with the upper-left * of the imageable area of the page. */ private Point2D mOrigin; /** * Create a new Printable that will translate the drawing done by * painter on to the imageable area of a page. * * @param painter * The object responsible for drawing the canvas * * @param origin * The point in the canvas that will be mapped to the * upper-left corner of the page's imageable area. */ public TranslatedPrintable(Printable painter, Point2D origin) { mPainter = painter; mOrigin = origin; } /** * Prints the page at the specified index into the specified * {@link Graphics} context in the specified format. A PrinterJob calls * the Printableinterface to request that a page be rendered into the * context specified by graphics. The format of the page to be drawn is * specified by pageFormat. The zero based index of the requested page * is specified by pageIndex. If the requested page does not exist then * this method returns NO_SUCH_PAGE; otherwise PAGE_EXISTS is returned. * The Graphics class or subclass implements the {@link PrinterGraphics} * interface to provide additional information. If the Printable object * aborts the print job then it throws a {@link PrinterException}. * * @param graphics * the context into which the page is drawn * @param pageFormat * the size and orientation of the page being drawn * @param pageIndex * the zero based index of the page to be drawn * @return PAGE_EXISTS if the page is rendered successfully or * NO_SUCH_PAGE if pageIndex specifies a non-existent page. * @exception java.awt.print.PrinterException * thrown when the print job is terminated. */ public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException { Graphics2D g2 = (Graphics2D) graphics; g2.translate(-mOrigin.getX(), -mOrigin.getY()); mPainter.print(g2, pageFormat, 1); return PAGE_EXISTS; } } }

 

 JComponentVista.java

import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.print.PageFormat; import java.awt.print.Printable; import java.awt.print.PrinterException; import javax.swing.JComponent; public class JComponentVista extends Vista implements Printable { private static final boolean SYMMETRIC_SCALING = true; private static final boolean ASYMMETRIC_SCALING = false; private double mScaleX; private double mScaleY; /** * The Swing component to print. */ private JComponent mComponent; /** * Create a Pageable that can print a Swing JComponent over multiple pages. * * @param c * The swing JComponent to be printed. * * @param format * The size of the pages over which the componenent will be * printed. */ public JComponentVista(JComponent c, PageFormat format) { setPageFormat(format); setPrintable(this); setComponent(c); /* * Tell the Vista we subclassed the size of the canvas. */ Rectangle componentBounds = c.getBounds(null); setSize(componentBounds.width, componentBounds.height); setScale(1, 1); } protected void setComponent(JComponent c) { mComponent = c; } protected void setScale(double scaleX, double scaleY) { mScaleX = scaleX; mScaleY = scaleY; } public void scaleToFitX() { PageFormat format = getPageFormat(); Rectangle componentBounds = mComponent.getBounds(null); double scaleX = format.getImageableWidth() / componentBounds.width; double scaleY = scaleX; if (scaleX < 1) { setSize((float) format.getImageableWidth(), (float) (componentBounds.height * scaleY)); setScale(scaleX, scaleY); } } public void scaleToFitY() { PageFormat format = getPageFormat(); Rectangle componentBounds = mComponent.getBounds(null); double scaleY = format.getImageableHeight() / componentBounds.height; double scaleX = scaleY; if (scaleY < 1) { setSize((float) (componentBounds.width * scaleX), (float) format .getImageableHeight()); setScale(scaleX, scaleY); } } public void scaleToFit(boolean useSymmetricScaling) { PageFormat format = getPageFormat(); Rectangle componentBounds = mComponent.getBounds(null); double scaleX = format.getImageableWidth() / componentBounds.width; double scaleY = format.getImageableHeight() / componentBounds.height; if (scaleX < 1 || scaleY < 1) { if (useSymmetricScaling) { if (scaleX < scaleY) { scaleY = scaleX; } else { scaleX = scaleY; } } setSize((float) (componentBounds.width * scaleX), (float) (componentBounds.height * scaleY)); setScale(scaleX, scaleY); } } public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException { Graphics2D g2 = (Graphics2D) graphics; g2.translate(pageFormat.getImageableX(), pageFormat.getImageableY()); Rectangle componentBounds = mComponent.getBounds(null); g2.translate(-componentBounds.x, -componentBounds.y); g2.scale(mScaleX, mScaleY); boolean wasBuffered = mComponent.isDoubleBuffered(); mComponent.paint(g2); mComponent.setDoubleBuffered(wasBuffered); return PAGE_EXISTS; } }   

工具类

PrintFactory.java

import java.awt.print.PageFormat; import java.awt.print.PrinterException; import java.awt.print.PrinterJob; import javax.swing.JComponent; import org.apache.log4j.Logger; public class PrintFactory { static Logger logger = Logger.getLogger(PrintFactory.class); private static PrintFactory instance; private JComponentVista vista; public static PrintFactory getInstance() { if (instance == null) { instance = new PrintFactory(); } return instance; } private PrintFactory() { } public void printJComponent(JComponent c, PageFormat format) { vista = new JComponentVista(c, format); vista.scaleToFitX(); PrinterJob pj = PrinterJob.getPrinterJob(); pj.setPageable(vista); try { if (pj.printDialog()) { pj.print(); } } catch (PrinterException e) { logger.error(e); } } public void printJComponent(JComponent c) { printJComponent(c, new PageFormat()); } }   

 

带打印功能的文本编辑器
import java.awt.BorderLayout; import java.awt.Point; import java.awt.event.ActionEvent; import java.io.IOException; import java.net.URL; import java.util.ArrayList; import java.util.List; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JToolBar; import org.jdesktop.swingx.JXEditorPane; import org.jdesktop.swingx.action.AbstractActionExt; import org.jdesktop.swingx.action.ActionContainerFactory; import org.jdesktop.swingx.action.ActionManager; import org.jdesktop.swingx.action.TargetableAction; public class PrintableEditorPane extends JPanel { private JScrollPane scrlpnEditor; private JXEditorPane editorPane; private List toolbarActions = new ArrayList(); private ActionManager manager; public PrintableEditorPane() { super(); setLayout(new BorderLayout()); manager = ActionManager.getInstance(); // manager.addAction(save); // manager.addAction(new BoundAction("保存", "save", // loadIcon("general/Save24.gif"))); manager.addAction(print); manager.addAction(new TargetableAction("剪切", "cut", ImageIconUtil .getImageIcon("text/Cut16.gif"))); manager.addAction(new TargetableAction("复制", "copy", ImageIconUtil .getImageIcon("text/Copy16.gif"))); manager.addAction(new TargetableAction("粘贴", "paste", ImageIconUtil .getImageIcon("text/Paste16.gif"))); manager.addAction(new TargetableAction("撤销", "undo", ImageIconUtil .getImageIcon("text/Undo16.gif"))); manager.addAction(new TargetableAction("重复", "redo", ImageIconUtil .getImageIcon("text/Redo16.gif"))); manager.addAction(new TargetableAction("查找", "find", ImageIconUtil .getImageIcon("text/Search16.gif"))); manager.addAction(new TargetableAction("左对齐", "left-justify", ImageIconUtil.getImageIcon("text/AlignLeft16.gif"))); manager.addAction(new TargetableAction("居中对齐", "center-justify", ImageIconUtil.getImageIcon("text/AlignCenter16.gif"))); manager.addAction(new TargetableAction("右对齐", "right-justify", ImageIconUtil.getImageIcon("text/AlignRight16.gif"))); manager.addAction(new TargetableAction("加粗", "font-bold", ImageIconUtil .getImageIcon("text/Bold16.gif"))); manager.addAction(new TargetableAction("斜体", "font-italic", ImageIconUtil.getImageIcon("text/Italic16.gif"))); manager.addAction(new TargetableAction("普通", "font-normal", ImageIconUtil.getImageIcon("text/Normal16.gif"))); manager.addAction(new TargetableAction("下划线", "font-underline", ImageIconUtil.getImageIcon("text/Underline16.gif"))); manager.addAction(new TargetableAction("10号字", "font-size-10")); // manager.addAction(new TargetableAction("12号字", "font-size-12")); manager.addAction(new TargetableAction("16号字", "font-size-16")); manager.addAction(new TargetableAction("24号字", "font-size-24")); manager.addAction(new TargetableAction("36号字", "font-size-36")); ((AbstractActionExt) manager.getAction("left-justify")) .setGroup("alignment"); ((AbstractActionExt) manager.getAction("center-justify")) .setGroup("alignment"); ((AbstractActionExt) manager.getAction("right-justify")) .setGroup("alignment"); ((AbstractActionExt) manager.getAction("font-bold")) .setStateAction(true); ((AbstractActionExt) manager.getAction("font-italic")) .setStateAction(true); ((AbstractActionExt) manager.getAction("font-underline")) .setStateAction(true); ((AbstractActionExt) manager.getAction("font-normal")) .setStateAction(true); ((AbstractActionExt) manager.getAction("font-size-10")) .setGroup("font-size"); // ((AbstractActionExt) manager.getAction("font-size-12")) // .setGroup("font-size"); ((AbstractActionExt) manager.getAction("font-size-16")) .setGroup("font-size"); ((AbstractActionExt) manager.getAction("font-size-24")) .setGroup("font-size"); ((AbstractActionExt) manager.getAction("font-size-36")) .setGroup("font-size"); toolbarActions.add("print"); toolbarActions.add(null); toolbarActions.add("cut"); toolbarActions.add("copy"); toolbarActions.add("paste"); toolbarActions.add("undo"); toolbarActions.add("redo"); toolbarActions.add("find"); toolbarActions.add(null); toolbarActions.add("left-justify"); toolbarActions.add("center-justify"); toolbarActions.add("right-justify"); toolbarActions.add(null); toolbarActions.add("font-bold"); toolbarActions.add("font-italic"); toolbarActions.add("font-underline"); toolbarActions.add("font-normal"); toolbarActions.add(null); toolbarActions.add("font-size-10"); // toolbarActions.add("font-size-12"); toolbarActions.add("font-size-16"); toolbarActions.add("font-size-24"); toolbarActions.add("font-size-36"); final JToolBar toolBar = new ActionContainerFactory(manager) .createToolBar(toolbarActions); toolBar.setFloatable(false); add(toolBar, BorderLayout.NORTH); scrlpnEditor = new JScrollPane(); add(scrlpnEditor, BorderLayout.CENTER); editorPane = new JXEditorPane("text/html", ""); scrlpnEditor.setViewportView(editorPane); } AbstractActionExt print = new AbstractActionExt("打印", "print", ImageIconUtil.getImageIcon("text/Print16.gif")) { @Override public void actionPerformed(ActionEvent e) { printAction(); } }; public void printAction() { scrlpnEditor.getViewport().setViewPosition(new Point(0, 0)); PrintFactory.getInstance().printJComponent(editorPane); } public void setPage(URL url) { try { editorPane.setPage(url); } catch (IOException e) { } } public String getText() { return editorPane.getText(); } public void setText(String text) { editorPane.setText(text); } public JXEditorPane getEditorPane() { return editorPane; } }