Java Swing Print() method

Diskutiere Java Swing Print() method im AWT, Swing, JavaFX & SWT Bereich.
S

Selmau

Hallo zusammen

Ich habe ein kleines Java Problem, denn ich möchte eine JTable per Knopfdruck über einen Etikettendrucker drucken, ohne Druckfenster.

Nun ist das Problem, wenn in der print() Methode kein Druckfenster möchte, muss ich bei den Parametertn einen Header und einen Footer angeben, sobald ich dies tue, ist auf der Etikette der Header und der Footer viel zu gross, und meine Tabelle viel zu klein. Die Proportionen stimmen nicht. Wie kann ich bei der Print Methode Header und Footer weglassen und kein Druckfenster anzeigen lassen?

Hier mein Code:
Code:
    try {
                        table_3.print(JTable.PrintMode.FIT_WIDTH, header, footer,false, null,true);
                } catch (PrinterException e) {
                }
 
S

Selmau

Ja das kann ich schon, jedoch wird der header und der footer auf der Etikette trotzdem einberechnet doch nicht gedruckt, die Tabelle ist aber weiterhin zu klein.
 
M

Meniskusschaden

Kann ich so nicht reproduzieren. Wenn du print()ohne Parameter aufrufst, werden die fehlenden Parameter aber ohnehin mit Standardwerten aufgefüllt (header und footer mit null). Du kannst ja mal in einer Version, bei der der Ausdruck in Ordnung ist, mit dem Debugger verfolgen, mit welchen Parametern die print-Methode letztendlich wirklich aufgerufen wird und es dann genauso machen.
 
S

Selmau

Ich bin jetzt im Internet auf einen anderen Forumbeitrag gestossen. Dort lösst jemand das Problem mit einer neuen Klasse als Implementierung zu Printable. Die neue Klasse wird dann über getPrintable() aufgerufen, dedoch hat die Klasse meiner Meinung nach keinen Cunstractor oder ich rufe Sie falsch auf.
http://stackoverflow.com/questions/7344328/printing-the-data-of-a-jtable-without-any-border

Hier die neue Klasse
Code:
/*
* @(#)TablePrintable.java  1.41 05/11/17
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.text.MessageFormat;

import javax.swing.JTable;
import javax.swing.JTable.PrintMode;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumnModel;

/**
* An implementation of <code>Printable</code> for printing
* <code>JTable</code>s.
* <p>
* This implementation spreads table rows naturally in sequence
* across multiple pages, fitting as many rows as possible per page.
* The distribution of columns, on the other hand, is controlled by a
* printing mode parameter passed to the constructor. When
* <code>JTable.PrintMode.NORMAL</code> is used, the implementation
* handles columns in a similar manner to how it handles rows, spreading them
* across multiple pages (in an order consistent with the table's
* <code>ComponentOrientation</code>).
* When <code>JTable.PrintMode.FIT_WIDTH</code> is given, the implementation
* scales the output smaller if necessary, to ensure that all columns fit on
* the page. (Note that width and height are scaled equally, ensuring that the
* aspect ratio remains the same).
* <p>
* The portion of table printed on each page is headed by the
* appropriate section of the table's <code>JTableHeader</code>.
* <p>
* Header and footer text can be added to the output by providing
* <code>MessageFormat</code> instances to the constructor. The
* printing code requests Strings from the formats by calling
* their <code>format</code> method with a single parameter:
* an <code>Object</code> array containing a single element of type
* <code>Integer</code>, representing the current page number.
* <p>
* There are certain circumstances where this <code>Printable</code>
* cannot fit items appropriately, resulting in clipped output.
* These are:
* <ul>
*   <li>In any mode, when the header or footer text is too wide to
*       fit completely in the printable area. The implementation
*       prints as much of the text as possible starting from the beginning,
*       as determined by the table's <code>ComponentOrientation</code>.
*   <li>In any mode, when a row is too tall to fit in the
*       printable area. The upper most portion of the row
*       is printed and no lower border is shown.
*   <li>In <code>JTable.PrintMode.NORMAL</code> when a column
*       is too wide to fit in the printable area. The center of the
*       column is printed and no left and right borders are shown.
* </ul>
* <p>
* It is entirely valid for a developer to wrap this <code>Printable</code>
* inside another in order to create complex reports and documents. They may
* even request that different pages be rendered into different sized
* printable areas. The implementation was designed to handle this by
* performing most of its calculations on the fly. However, providing different
* sizes works best when <code>JTable.PrintMode.FIT_WIDTH</code> is used, or
* when only the printable width is changed between pages. This is because when
* it is printing a set of rows in <code>JTable.PrintMode.NORMAL</code> and the
* implementation determines a need to distribute columns across pages,
* it assumes that all of those rows will fit on each subsequent page needed
* to fit the columns.
* <p>
* It is the responsibility of the developer to ensure that the table is not
* modified in any way after this <code>Printable</code> is created (invalid
* modifications include changes in: size, renderers, or underlying data).
* The behavior of this <code>Printable</code> is undefined if the table is
* changed at any time after creation.
*
* @author  Shannon Hickey
* @version 1.41 11/17/05
*/
class MyPrintable implements Printable {

   /** The table to print. */
   private JTable table;

   /** For quick reference to the table's header. */
   private JTableHeader header;

   /** For quick reference to the table's column model. */
   private TableColumnModel colModel;

   /** To save multiple calculations of total column width. */
   private int totalColWidth;

   /** The printing mode of this printable. */
   private JTable.PrintMode printMode;

   /** Provides the header text for the table. */
   private MessageFormat headerFormat;

   /** Provides the footer text for the table. */
   private MessageFormat footerFormat;

   /** The most recent page index asked to print. */
   private int last = -1;

   /** The next row to print. */
   private int row = 0;

   /** The next column to print. */
   private int col = 0;

   /** Used to store an area of the table to be printed. */
   private final Rectangle clip = new Rectangle(0, 0, 0, 0);

   /** Used to store an area of the table's header to be printed. */
   private final Rectangle hclip = new Rectangle(0, 0, 0, 0);

   /** Saves the creation of multiple rectangles. */
   private final Rectangle tempRect = new Rectangle(0, 0, 0, 0);

   /** Vertical space to leave between table and header/footer text. */
   private static final int H_F_SPACE = 8;

   /** Font size for the header text. */
   private static final float HEADER_FONT_SIZE = 18.0f;

   /** Font size for the footer text. */
   private static final float FOOTER_FONT_SIZE = 12.0f;

   /** The font to use in rendering header text. */
   private Font headerFont;

   /** The font to use in rendering footer text. */
   private Font footerFont;

 


/**
    * Create a new <code>TablePrintable</code> for the given
    * <code>JTable</code>. Header and footer text can be specified using the
    * two <code>MessageFormat</code> parameters. When called upon to provide
    * a String, each format is given the current page number.
    *
    * @param  table         the table to print
    * @param  printMode     the printing mode for this printable
    * @param  headerFormat  a <code>MessageFormat</code> specifying the text to
    *                       be used in printing a header, or null for none
    * @param  footerFormat  a <code>MessageFormat</code> specifying the text to
    *                       be used in printing a footer, or null for none
* @return
    * @throws IllegalArgumentException if passed an invalid print mode
    */
   public void TablePrintable(JTable table,
                         JTable.PrintMode printMode,
                         MessageFormat headerFormat,
                         MessageFormat footerFormat) {

       this.table = table;

       header = table.getTableHeader();
       colModel = table.getColumnModel();
       totalColWidth = colModel.getTotalColumnWidth();

       if (header != null) {
           // the header clip height can be set once since it's unchanging
           hclip.height = header.getHeight();
       }

       this.printMode = printMode;

       this.headerFormat = headerFormat;
       this.footerFormat = footerFormat;

       // derive the header and footer font from the table's font
       headerFont = table.getFont().deriveFont(Font.BOLD,
                                               HEADER_FONT_SIZE);
       footerFont = table.getFont().deriveFont(Font.PLAIN,
                                               FOOTER_FONT_SIZE);
   }

   /**
    * Prints the specified page of the table into the given {@link Graphics}
    * context, in the specified format.
    *
    * @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 a non-existent page index is specified
    * @throws  PrinterException if an error causes printing to be aborted
    */
   @Override
   public int print(Graphics graphics, PageFormat pageFormat, int pageIndex)
                                                      throws PrinterException {

       // for easy access to these values
       final int imgWidth = (int)pageFormat.getImageableWidth();
       final int imgHeight = (int)pageFormat.getImageableHeight();

       if (imgWidth <= 0) {
           throw new PrinterException("Width of printable area is too small.");
       }

       // to pass the page number when formatting the header and footer text
       Object[] pageNumber = new Object[]{new Integer(pageIndex + 1)};

       // fetch the formatted header text, if any
       String headerText = null;
       if (headerFormat != null) {
           headerText = headerFormat.format(pageNumber);
       }

       // fetch the formatted footer text, if any
       String footerText = null;
       if (footerFormat != null) {
           footerText = footerFormat.format(pageNumber);
       }

       // to store the bounds of the header and footer text
       Rectangle2D hRect = null;
       Rectangle2D fRect = null;

       // the amount of vertical space needed for the header and footer text
       int headerTextSpace = 0;
       int footerTextSpace = 0;

       // the amount of vertical space available for printing the table
       int availableSpace = imgHeight;

       // if there's header text, find out how much space is needed for it
       // and subtract that from the available space
       if (headerText != null) {
           graphics.setFont(headerFont);
           hRect = graphics.getFontMetrics().getStringBounds(headerText,
                                                             graphics);

           headerTextSpace = (int)Math.ceil(hRect.getHeight());
           availableSpace -= headerTextSpace + H_F_SPACE;
       }

       // if there's footer text, find out how much space is needed for it
       // and subtract that from the available space
       if (footerText != null) {
           graphics.setFont(footerFont);
           fRect = graphics.getFontMetrics().getStringBounds(footerText,
                                                             graphics);

           footerTextSpace = (int)Math.ceil(fRect.getHeight());
           availableSpace -= footerTextSpace + H_F_SPACE;
       }

       if (availableSpace <= 0) {
           throw new PrinterException("Height of printable area is too small.");
       }

       // depending on the print mode, we may need a scale factor to
       // fit the table's entire width on the page
       double sf = 1.0D;
       if (printMode == JTable.PrintMode.FIT_WIDTH &&
               totalColWidth > imgWidth) {

           // if not, we would have thrown an acception previously
           assert imgWidth > 0;

           // it must be, according to the if-condition, since imgWidth > 0
           assert totalColWidth > 1;

           sf = (double)imgWidth / (double)totalColWidth;
       }

       // dictated by the previous two assertions
       assert sf > 0;

       // This is in a loop for two reasons:
       // First, it allows us to catch up in case we're called starting
       // with a non-zero pageIndex. Second, we know that we can be called
       // for the same page multiple times. The condition of this while
       // loop acts as a check, ensuring that we don't attempt to do the
       // calculations again when we are called subsequent times for the
       // same page.
       while (last < pageIndex) {
           // if we are finished all columns in all rows
           if (row >= table.getRowCount() && col == 0) {
               return NO_SUCH_PAGE;
           }

           // rather than multiplying every row and column by the scale factor
           // in findNextClip, just pass a width and height that have already
           // been divided by it
           int scaledWidth = (int)(imgWidth / sf);
           int scaledHeight = (int)((availableSpace - hclip.height) / sf);

           // calculate the area of the table to be printed for this page
           findNextClip(scaledWidth, scaledHeight);

           last++;
       }

       // translate into the co-ordinate system of the pageFormat
       Graphics2D g2d = (Graphics2D)graphics;
       g2d.translate(pageFormat.getImageableX(), pageFormat.getImageableY());

       // to save and store the transform
       AffineTransform oldTrans;

       // if there's footer text, print it at the bottom of the imageable area
       if (footerText != null) {
           oldTrans = g2d.getTransform();

           g2d.translate(0, imgHeight - footerTextSpace);

           printText(g2d, footerText, fRect, footerFont, imgWidth);

           g2d.setTransform(oldTrans);
       }

       // if there's header text, print it at the top of the imageable area
       // and then translate downwards
       if (headerText != null) {
           printText(g2d, headerText, hRect, headerFont, imgWidth);

           g2d.translate(0, headerTextSpace + H_F_SPACE);
       }

       // constrain the table output to the available space
       tempRect.x = 0;
       tempRect.y = 0;
       tempRect.width = imgWidth;
       tempRect.height = availableSpace;
       g2d.clip(tempRect);

       // if we have a scale factor, scale the graphics object to fit
       // the entire width
       if (sf != 1.0D) {
           g2d.scale(sf, sf);

       // otherwise, ensure that the current portion of the table is
       // centered horizontally
       } else {
           int diff = (imgWidth - clip.width) / 2;
           g2d.translate(diff, 0);
       }

       // store the old transform and clip for later restoration
       oldTrans = g2d.getTransform();
       Shape oldClip = g2d.getClip();

       // if there's a table header, print the current section and
       // then translate downwards
       if (header != null) {
           hclip.x = clip.x;
           hclip.width = clip.width;

           g2d.translate(-hclip.x, 0);
           g2d.clip(hclip);
           header.print(g2d);

           // restore the original transform and clip
           g2d.setTransform(oldTrans);
           g2d.setClip(oldClip);

           // translate downwards
           g2d.translate(0, hclip.height);
       }

       // print the current section of the table
       g2d.translate(-clip.x, -clip.y);
       g2d.clip(clip);
       table.print(g2d);

       // restore the original transform and clip
       g2d.setTransform(oldTrans);
       g2d.setClip(oldClip);

       // draw a box around the table
       g2d.setColor(Color.BLACK);
       g2d.drawRect(0, 0, clip.width, hclip.height + clip.height);

       return PAGE_EXISTS;
   }

   /**
    * A helper method that encapsulates common code for rendering the
    * header and footer text.
    *
    * @param  g2d       the graphics to draw into
    * @param  text      the text to draw, non null
    * @param  rect      the bounding rectangle for this text,
    *                   as calculated at the given font, non null
    * @param  font      the font to draw the text in, non null
    * @param  imgWidth  the width of the area to draw into
    */
   private void printText(Graphics2D g2d,
                          String text,
                          Rectangle2D rect,
                          Font font,
                          int imgWidth) {

           int tx;

           // if the text is small enough to fit, center it
           if (rect.getWidth() < imgWidth) {
               tx = (int)((imgWidth - rect.getWidth()) / 2);

           // otherwise, if the table is LTR, ensure the left side of
           // the text shows; the right can be clipped
           } else if (table.getComponentOrientation().isLeftToRight()) {
               tx = 0;

           // otherwise, ensure the right side of the text shows
           } else {
               tx = -(int)(Math.ceil(rect.getWidth()) - imgWidth);
           }

           int ty = (int)Math.ceil(Math.abs(rect.getY()));
           g2d.setColor(Color.BLACK);
           g2d.setFont(font);
           g2d.drawString(text, tx, ty);
   }

   /**
    * Calculate the area of the table to be printed for
    * the next page. This should only be called if there
    * are rows and columns left to print.
    *
    * To avoid an infinite loop in printing, this will
    * always put at least one cell on each page.
    *
    * @param  pw  the width of the area to print in
    * @param  ph  the height of the area to print in
    */
   private void findNextClip(int pw, int ph) {
       final boolean ltr = table.getComponentOrientation().isLeftToRight();

       // if we're ready to start a new set of rows
       if (col == 0) {
           if (ltr) {
               // adjust clip to the left of the first column
               clip.x = 0;
           } else {
               // adjust clip to the right of the first column
               clip.x = totalColWidth;
           }

           // adjust clip to the top of the next set of rows
           clip.y += clip.height;

           // adjust clip width and height to be zero
           clip.width = 0;
           clip.height = 0;

           // fit as many rows as possible, and at least one
           int rowCount = table.getRowCount();
           int rowHeight = table.getRowHeight(row);
           do {
               clip.height += rowHeight;

               if (++row >= rowCount) {
                   break;
               }

               rowHeight = table.getRowHeight(row);
           } while (clip.height + rowHeight <= ph);
       }

       // we can short-circuit for JTable.PrintMode.FIT_WIDTH since
       // we'll always fit all columns on the page
       if (printMode == JTable.PrintMode.FIT_WIDTH) {
           clip.x = 0;
           clip.width = totalColWidth;
           return;
       }

       if (ltr) {
           // adjust clip to the left of the next set of columns
           clip.x += clip.width;
       }

       // adjust clip width to be zero
       clip.width = 0;

       // fit as many columns as possible, and at least one
       int colCount = table.getColumnCount();
       int colWidth = colModel.getColumn(col).getWidth();
       do {
           clip.width += colWidth;
           if (!ltr) {
               clip.x -= colWidth;
           }

           if (++col >= colCount) {
               // reset col to 0 to indicate we're finished all columns
               col = 0;

               break;
           }

           colWidth = colModel.getColumn(col).getWidth();
       } while (clip.width + colWidth <= pw);

   }

}

Und hier So wie sie aufgerufen wird, jedoch bekomme ich so immer einen Fehler:
Code:
                try {
                     table_4 = new javax.swing.JTable(){
                            @Override
                            public Printable getPrintable( PrintMode printMode, MessageFormat headerFormat, MessageFormat footerFormat ) {
                                return new MyPrintable( this, printMode, header, footer );
                            }
                        };
                   
                   
                    //MyPrintable print = new MyPrintable();
                    //print.TablePrintable(table_4, JTable.PrintMode.FIT_WIDTH, null, null);
                    //table_tisch_print.print(JTable.PrintMode.FIT_WIDTH, null, null, false, null, false);   
                    //table_1.print(JTable.PrintMode.FIT_WIDTH, header, footer,false, null,true);
                } catch (Exception e) {
                   
                }
                }
 
Thema: 

Java Swing Print() method

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