fontpanel.java

一个小公司要求给写的很简单的任务管理系统。

            /// Push the actual draw area 60 down to allow info to be printed
            g.translate( (int) pf.getImageableX(), (int) pf.getImageableY() + 60 );
            try {
                drawText( g, pageWidth, pageHeight - 60 );
            }
            catch ( CannotDrawException e ) {
                f2dt.fireChangeStatus( ERRORS[ e.id ], true );
                return NO_SUCH_PAGE;
            }

            /// Draw information about what is being printed
            String hints = ( " with antialias " + antiAliasType + "and" +
                             " fractional metrics " + fractionalMetricsType +
			     " and lcd contrast = " + lcdContrast);
            String infoLine1 = ( "Printing" + MS_OPENING[textToUse] +
                                 modeSpecificNumStr( drawStart ) + " to " +
                                 modeSpecificNumStr( drawEnd ) + MS_CLOSING[textToUse] );
            String infoLine2 = ( "With " + fontName + " " + STYLES[fontStyle] + " at " +
                                 fontSize + " point size " + TRANSFORMS[fontTransform] );
            String infoLine3 = "Using " + METHODS[drawMethod] + hints;
            String infoLine4 = "Page: " + ( pageIndex + 1 );
            g.setFont( new Font( "dialog", Font.PLAIN, 12 ));
            g.setColor( Color.black );
            g.translate( 0, -60 );
            g.drawString( infoLine1, 15, 10 );
            g.drawString( infoLine2, 15, 22 );
            g.drawString( infoLine3, 15, 34 );
            g.drawString( infoLine4, 15, 46 );

            if ( drawEnd == drawLimit )
              /// This indicates that the draw will be completed with this page
              lastPage = pageIndex;

            /// Restore the changed values back...
            /// This is important for JScrollBar settings and LineBreak'ed TLs
            drawStart = backupDrawStart;
            drawEnd = backupDrawEnd;
            numCharAcross = backupNumCharAcross;
            numCharDown = backupNumCharDown;
            if ( textToUse == FILE_TEXT )
              lineBreakTLs = backupLineBreakTLs;
            return PAGE_EXISTS;
        }

        /// Ouputs the current canvas into a given PNG file
        public void writePNG( String fileName ) {
            try {
		ImageIO.write(backBuffer, "png", new java.io.File(fileName));
            }
            catch ( Exception e ) {
                f2dt.fireChangeStatus( "ERROR: Failed to Save PNG image; See stack trace", true );
                e.printStackTrace();
            }
        }

        /// Figures out whether a character at the pointer location is valid
        /// And if so, updates mouse location informations, as well as
        /// the information on the status bar
        private boolean checkMouseLoc( MouseEvent e ) {
            if ( gridWidth != 0 && gridHeight != 0 )
              if ( textToUse == RANGE_TEXT || textToUse == ALL_GLYPHS ) {
                  int charLocX = ( e.getX() - canvasInset_X ) / gridWidth;
                  int charLocY = ( e.getY() - canvasInset_Y ) / gridHeight;

                  /// Check to make sure the mouse click location is within drawn area
                  if ( charLocX >= 0 && charLocY >= 0 &&
                       charLocX < numCharAcross && charLocY < numCharDown ) {
                      int mouseOverChar =
                        charLocX + ( verticalBar.getValue() + charLocY ) * numCharAcross;
                      if ( textToUse == RANGE_TEXT )
                        mouseOverChar += drawRange[0];
                      if ( mouseOverChar > drawEnd )
                        return false;

                      mouseOverCharX = charLocX;
                      mouseOverCharY = charLocY;
                      currMouseOverChar = mouseOverChar;
                      /// Update status bar
                      f2dt.fireChangeStatus( "Pointing to" + MS_OPENING[textToUse] +
                                             modeSpecificNumStr( mouseOverChar ), false );
                      return true;
                  }
              }
            return false;
        }

        /// Shows (updates) the character zoom window
        public void showZoomed() {
            GlyphVector gv;
            Font backup = testFont;
            Point canvasLoc = this.getLocationOnScreen();

            /// Calculate the zoom area's location and size...
            int dialogOffsetX = (int) ( gridWidth * ( ZOOM - 1 ) / 2 );
            int dialogOffsetY = (int) ( gridHeight * ( ZOOM - 1 ) / 2 );
            int zoomAreaX =
              mouseOverCharX * gridWidth + canvasInset_X - dialogOffsetX;
            int zoomAreaY =
              mouseOverCharY * gridHeight + canvasInset_Y - dialogOffsetY;
            int zoomAreaWidth = (int) ( gridWidth * ZOOM );
            int zoomAreaHeight = (int) ( gridHeight * ZOOM );

            /// Position and set size of zoom window as needed
            zoomWindow.setLocation( canvasLoc.x + zoomAreaX, canvasLoc.y + zoomAreaY );
            if ( !nowZooming ) {
                if ( zoomWindow.getWarningString() != null )
                  /// If this is not opened as a "secure" window,
                  /// it has a banner below the zoom dialog which makes it look really BAD
                  /// So enlarge it by a bit
                  zoomWindow.setSize( zoomAreaWidth + 1, zoomAreaHeight + 20 );
                else
                  zoomWindow.setSize( zoomAreaWidth + 1, zoomAreaHeight + 1 );
            }

            /// Prepare zoomed image
            zoomImage =
              (BufferedImage) zoomWindow.createImage( zoomAreaWidth + 1,
                                                      zoomAreaHeight + 1 );
            Graphics2D g2 = (Graphics2D) zoomImage.getGraphics();
            testFont = testFont.deriveFont( fontSize * ZOOM );
            setParams( g2 );
            g2.setColor( Color.white );
            g2.fillRect( 0, 0, zoomAreaWidth, zoomAreaHeight );
            g2.setColor( Color.black );
            g2.drawRect( 0, 0, zoomAreaWidth, zoomAreaHeight );
            modeSpecificDrawChar( g2, currMouseOverChar,
                                  zoomAreaWidth / 2, (int) ( maxAscent * ZOOM ));
            g2.dispose();
            if ( !nowZooming )
              zoomWindow.show();
            /// This is sort of redundant... since there is a paint function
            /// inside zoomWindow definition that does the drawImage.
            /// (I should be able to call just repaint() here)
            /// However, for some reason, that paint function fails to respond
            /// from second time and on; So I have to force the paint here...
            zoomWindow.getGraphics().drawImage( zoomImage, 0, 0, this );

            nowZooming = true;
            prevZoomChar = currMouseOverChar;
            testFont = backup;
            
            // Windows does not repaint correctly, after
            // a zoom. Thus, we need to force the canvas
            // to repaint, but only once. After the first repaint,
            // everything stabilizes. [ABP]
            if ( firstTime() ) {
                refresh();
            }
        }

        /// Listener Functions

        /// MouseListener interface function
        /// Zooms a character when mouse is pressed above it
        public void mousePressed( MouseEvent e ) {
            if ( !showingError) {
                if ( checkMouseLoc( e )) {
                    showZoomed();
                    this.setCursor( blankCursor );
                }
            }
        }

        /// MouseListener interface function
        /// Redraws the area that was drawn over by zoomed character
        public void mouseReleased( MouseEvent e ) {
            if ( textToUse == RANGE_TEXT || textToUse == ALL_GLYPHS ) {
                if ( nowZooming )
                  zoomWindow.hide();
                nowZooming = false;
            }
            this.setCursor( Cursor.getDefaultCursor() );
        }

        /// MouseListener interface function
        /// Resets the status bar to display range instead of a specific character
        public void mouseExited( MouseEvent e ) {
            if ( !showingError && !nowZooming )
              f2dt.fireChangeStatus( backupStatusString, false );
        }

        /// MouseMotionListener interface function
        /// Adjusts the status bar message when mouse moves over a character
        public void mouseMoved( MouseEvent e ) {
            if ( !showingError ) {
                if ( !checkMouseLoc( e ))
                  f2dt.fireChangeStatus( backupStatusString, false );
            }
        }

        /// MouseMotionListener interface function
        /// Scrolls the zoomed character when mouse is dragged
        public void mouseDragged( MouseEvent e ) {
            if ( !showingError )
              if ( nowZooming ) {
                  if ( checkMouseLoc( e ) && currMouseOverChar != prevZoomChar )
                    showZoomed();
              }
        }

        /// Empty function to comply with interface requirement
        public void mouseClicked( MouseEvent e ) {}
        public void mouseEntered( MouseEvent e ) {}
    }

    private final class CannotDrawException extends RuntimeException {
        /// Error ID
        public final int id;

        public CannotDrawException( int i ) {
            id = i;
        }
    }

    enum FMValues {
       FMDEFAULT ("DEFAULT",  VALUE_FRACTIONALMETRICS_DEFAULT),
       FMOFF     ("OFF",      VALUE_FRACTIONALMETRICS_OFF),
       FMON      ("ON",       VALUE_FRACTIONALMETRICS_ON);

        private String name;
        private Object hint;

        private static FMValues[] valArray;

        FMValues(String s, Object o) {
            name = s;
            hint = o;
        }

        public String toString() {
            return name;
        }

       public Object getHint() {
           return hint;
       }
       public static Object getValue(int ordinal) {
	   if (valArray == null) {
	       valArray = (FMValues[])EnumSet.allOf(FMValues.class).toArray(new FMValues[0]);
	   }
	   for (int i=0;i<valArray.length;i++) {
	       if (valArray[i].ordinal() == ordinal) {
		   return valArray[i];
	       }
	   }
	   return valArray[0];
       }
       private static FMValues[] getArray() {
	   if (valArray == null) {
	       valArray = (FMValues[])EnumSet.allOf(FMValues.class).toArray(new FMValues[0]);
	   }
	   return valArray;
       }

       public static int getHintVal(Object hint) {
	   getArray();
	   for (int i=0;i<valArray.length;i++) {
	       if (valArray[i].getHint() == hint) {
		   return i;
	       }
	   }
	   return 0;
       }
    }

   enum AAValues {
       AADEFAULT ("DEFAULT",  VALUE_TEXT_ANTIALIAS_DEFAULT),
       AAOFF     ("OFF",      VALUE_TEXT_ANTIALIAS_OFF),
       AAON      ("ON",       VALUE_TEXT_ANTIALIAS_ON),
       AAGASP    ("GASP",     VALUE_TEXT_ANTIALIAS_GASP),
       AALCDHRGB ("LCD_HRGB", VALUE_TEXT_ANTIALIAS_LCD_HRGB),
       AALCDHBGR ("LCD_HBGR", VALUE_TEXT_ANTIALIAS_LCD_HBGR),
       AALCDVRGB ("LCD_VRGB", VALUE_TEXT_ANTIALIAS_LCD_VRGB),
       AALCDVBGR ("LCD_VBGR", VALUE_TEXT_ANTIALIAS_LCD_VBGR);

        private String name;
        private Object hint;

        private static AAValues[] valArray;

        AAValues(String s, Object o) {
            name = s;
            hint = o;
        }

        public String toString() {
            return name;
        }

       public Object getHint() {
           return hint;
       }

       public static boolean isLCDMode(Object o) {
	   return (o instanceof AAValues &&
		   ((AAValues)o).ordinal() >= AALCDHRGB.ordinal());
       }
       
       public static Object getValue(int ordinal) {
	   if (valArray == null) {
	       valArray = (AAValues[])EnumSet.allOf(AAValues.class).toArray(new AAValues[0]);
	   }
	   for (int i=0;i<valArray.length;i++) {
	       if (valArray[i].ordinal() == ordinal) {
		   return valArray[i];
	       }
	   }
	   return valArray[0];
       }

       private static AAValues[] getArray() {
	   if (valArray == null) {
	       Object [] oa = EnumSet.allOf(AAValues.class).toArray(new AAValues[0]);
	       valArray = (AAValues[])(EnumSet.allOf(AAValues.class).toArray(new AAValues[0]));
	   }
	   return valArray;
       }

       public static int getHintVal(Object hint) {
	   getArray();
	   for (int i=0;i<valArray.length;i++) {
	       if (valArray[i].getHint() == hint) {
		   return i;
	       }
	   }
	   return 0;
       }

    }

    private static Integer defaultContrast;
    static Integer getDefaultLCDContrast() {
	if (defaultContrast == null) {
	    GraphicsConfiguration gc =
	    GraphicsEnvironment.getLocalGraphicsEnvironment().
		getDefaultScreenDevice().getDefaultConfiguration();
	Graphics2D g2d =
	    (Graphics2D)(gc.createCompatibleImage(1,1).getGraphics());
	defaultContrast = (Integer)
	    g2d.getRenderingHint(RenderingHints.KEY_TEXT_LCD_CONTRAST);
	}
	return defaultContrast;
    }
}