llvm-gcc-4.0/libjava/javax/swing/text/Utilities.java - llvm-archive - Git at Google

 /* Utilities.java --
    Copyright (C) 2004, 2005  Free Software Foundation, Inc.

 This file is part of GNU Classpath.

 GNU Classpath is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2, or (at your option)
 any later version.

 GNU Classpath is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GNU Classpath; see the file COPYING.  If not, write to the
 Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 02111-1307 USA.

 Linking this library statically or dynamically with other modules is
 making a combined work based on this library.  Thus, the terms and
 conditions of the GNU General Public License cover the whole
 combination.

 As a special exception, the copyright holders of this library give you
 permission to link this library with independent modules to produce an
 executable, regardless of the license terms of these independent
 modules, and to copy and distribute the resulting executable under
 terms of your choice, provided that you also meet, for each linked
 independent module, the terms and conditions of the license of that
 module.  An independent module is a module which is not derived from
 or based on this library.  If you modify this library, you may extend
 this exception to your version of the library, but you are not
 obligated to do so.  If you do not wish to do so, delete this
 exception statement from your version. */


 package javax.swing.text;

 import java.awt.FontMetrics;
 import java.awt.Graphics;

 /**
  * A set of utilities to deal with text. This is used by several other classes
  * inside this package.
  *
  * @author Roman Kennke (roman@ontographics.com)
  */
 public class Utilities
 {
   /**
    * The length of the char buffer that holds the characters to be drawn.
    */
   private static final int BUF_LENGTH = 64;

   /**
    * Creates a new <code>Utilities</code> object.
    */
   public Utilities()
   {
     // Nothing to be done here.
   }

   /**
    * Draws the given text segment. Contained tabs and newline characters
    * are taken into account. Tabs are expanded using the
    * specified {@link TabExpander}.
    *
    * @param s the text fragment to be drawn.
    * @param x the x position for drawing.
    * @param y the y position for drawing.
    * @param g the {@link Graphics} context for drawing.
    * @param e the {@link TabExpander} which specifies the Tab-expanding
    *     technique.
    * @param startOffset starting offset in the text.
    * @return the x coordinate at the end of the drawn text.
    */
   public static final int drawTabbedText(Segment s, int x, int y, Graphics g,
                                          TabExpander e, int startOffset)
   {
     // This buffers the chars to be drawn.
     char[] buffer = s.array;


     // The current x and y pixel coordinates.
     int pixelX = x;
     int pixelY = y;

     // The font metrics of the current selected font.
     FontMetrics metrics = g.getFontMetrics();
     int ascent = metrics.getAscent();

     int pixelWidth = 0;
     int pos = 0;
     int len = 0;

     for (int offset = s.offset; offset < (s.offset + s.count); ++offset)
       {
         char c = buffer[offset];
         if (c == '\t' || c == '\n')
           {
             if (len > 0) {
               g.drawChars(buffer, pos, len, pixelX, pixelY + ascent);
               pixelX += pixelWidth;
               pixelWidth = 0;
             }
             pos = offset+1;
             len = 0;
           }

 	switch (c)
 	  {
 	  case '\t':
 	    // In case we have a tab, we just 'jump' over the tab.
 	    // When we have no tab expander we just use the width of ' '.
 	    if (e != null)
 	      pixelX = (int) e.nextTabStop((float) pixelX,
 					   startOffset + offset - s.offset);
 	    else
 	      pixelX += metrics.charWidth(' ');
 	    break;
 	  case '\n':
 	    // In case we have a newline, we must jump to the next line.
 	    pixelY += metrics.getHeight();
 	    pixelX = x;
 	    break;
 	  default:
             ++len;
 	    pixelWidth += metrics.charWidth(buffer[offset]);
 	    break;
 	  }
       }

     if (len > 0)
       g.drawChars(buffer, pos, len, pixelX, pixelY + ascent);

     return pixelX;
   }

   /**
    * Determines the width, that the given text <code>s</code> would take
    * if it was printed with the given {@link java.awt.FontMetrics} on the
    * specified screen position.
    * @param s the text fragment
    * @param metrics the font metrics of the font to be used
    * @param x the x coordinate of the point at which drawing should be done
    * @param e the {@link TabExpander} to be used
    * @param startOffset the index in <code>s</code> where to start
    * @returns the width of the given text s. This takes tabs and newlines
    * into account.
    */
   public static final int getTabbedTextWidth(Segment s, FontMetrics metrics,
                                              int x, TabExpander e,
                                              int startOffset)
   {
     // This buffers the chars to be drawn.
     char[] buffer = s.array;

     // The current x coordinate.
     int pixelX = x;

     // The current maximum width.
     int maxWidth = 0;

     for (int offset = s.offset; offset < (s.offset + s.count); ++offset)
       {
 	switch (buffer[offset])
 	  {
 	  case '\t':
 	    // In case we have a tab, we just 'jump' over the tab.
 	    // When we have no tab expander we just use the width of 'm'.
 	    if (e != null)
 	      pixelX = (int) e.nextTabStop((float) pixelX,
 					   startOffset + offset - s.offset);
 	    else
 	      pixelX += metrics.charWidth(' ');
 	    break;
 	  case '\n':
 	    // In case we have a newline, we must 'draw'
 	    // the buffer and jump on the next line.
 	    pixelX += metrics.charWidth(buffer[offset]);
 	    maxWidth = Math.max(maxWidth, pixelX - x);
 	    pixelX = x;
 	    break;
 	  default:
 	    // Here we draw the char.
 	    pixelX += metrics.charWidth(buffer[offset]);
 	    break;
 	  }
       }

     // Take the last line into account.
     maxWidth = Math.max(maxWidth, pixelX - x);

     return maxWidth;
   }
 }
	/* Utilities.java --
	Copyright (C) 2004, 2005 Free Software Foundation, Inc.

	This file is part of GNU Classpath.

	GNU Classpath is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	GNU Classpath is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with GNU Classpath; see the file COPYING. If not, write to the
	Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	02111-1307 USA.

	Linking this library statically or dynamically with other modules is
	making a combined work based on this library. Thus, the terms and
	conditions of the GNU General Public License cover the whole
	combination.

	As a special exception, the copyright holders of this library give you
	permission to link this library with independent modules to produce an
	executable, regardless of the license terms of these independent
	modules, and to copy and distribute the resulting executable under
	terms of your choice, provided that you also meet, for each linked
	independent module, the terms and conditions of the license of that
	module. An independent module is a module which is not derived from
	or based on this library. If you modify this library, you may extend
	this exception to your version of the library, but you are not
	obligated to do so. If you do not wish to do so, delete this
	exception statement from your version. */


	package javax.swing.text;

	import java.awt.FontMetrics;
	import java.awt.Graphics;

	/**
	* A set of utilities to deal with text. This is used by several other classes
	* inside this package.
	*
	* @author Roman Kennke (roman@ontographics.com)
	*/
	public class Utilities
	{
	/**
	* The length of the char buffer that holds the characters to be drawn.
	*/
	private static final int BUF_LENGTH = 64;

	/**
	* Creates a new <code>Utilities</code> object.
	*/
	public Utilities()
	{
	// Nothing to be done here.
	}

	/**
	* Draws the given text segment. Contained tabs and newline characters
	* are taken into account. Tabs are expanded using the
	* specified {@link TabExpander}.
	*
	* @param s the text fragment to be drawn.
	* @param x the x position for drawing.
	* @param y the y position for drawing.
	* @param g the {@link Graphics} context for drawing.
	* @param e the {@link TabExpander} which specifies the Tab-expanding
	* technique.
	* @param startOffset starting offset in the text.
	* @return the x coordinate at the end of the drawn text.
	*/
	public static final int drawTabbedText(Segment s, int x, int y, Graphics g,
	TabExpander e, int startOffset)
	{
	// This buffers the chars to be drawn.
	char[] buffer = s.array;


	// The current x and y pixel coordinates.
	int pixelX = x;
	int pixelY = y;

	// The font metrics of the current selected font.
	FontMetrics metrics = g.getFontMetrics();
	int ascent = metrics.getAscent();

	int pixelWidth = 0;
	int pos = 0;
	int len = 0;

	for (int offset = s.offset; offset < (s.offset + s.count); ++offset)
	{
	char c = buffer[offset];
	if (c == '\t' \|\| c == '\n')
	{
	if (len > 0) {
	g.drawChars(buffer, pos, len, pixelX, pixelY + ascent);
	pixelX += pixelWidth;
	pixelWidth = 0;
	}
	pos = offset+1;
	len = 0;
	}

	switch (c)
	{
	case '\t':
	// In case we have a tab, we just 'jump' over the tab.
	// When we have no tab expander we just use the width of ' '.
	if (e != null)
	pixelX = (int) e.nextTabStop((float) pixelX,
	startOffset + offset - s.offset);
	else
	pixelX += metrics.charWidth(' ');
	break;
	case '\n':
	// In case we have a newline, we must jump to the next line.
	pixelY += metrics.getHeight();
	pixelX = x;
	break;
	default:
	++len;
	pixelWidth += metrics.charWidth(buffer[offset]);
	break;
	}
	}

	if (len > 0)
	g.drawChars(buffer, pos, len, pixelX, pixelY + ascent);

	return pixelX;
	}

	/**
	* Determines the width, that the given text <code>s</code> would take
	* if it was printed with the given {@link java.awt.FontMetrics} on the
	* specified screen position.
	* @param s the text fragment
	* @param metrics the font metrics of the font to be used
	* @param x the x coordinate of the point at which drawing should be done
	* @param e the {@link TabExpander} to be used
	* @param startOffset the index in <code>s</code> where to start
	* @returns the width of the given text s. This takes tabs and newlines
	* into account.
	*/
	public static final int getTabbedTextWidth(Segment s, FontMetrics metrics,
	int x, TabExpander e,
	int startOffset)
	{
	// This buffers the chars to be drawn.
	char[] buffer = s.array;

	// The current x coordinate.
	int pixelX = x;

	// The current maximum width.
	int maxWidth = 0;

	for (int offset = s.offset; offset < (s.offset + s.count); ++offset)
	{
	switch (buffer[offset])
	{
	case '\t':
	// In case we have a tab, we just 'jump' over the tab.
	// When we have no tab expander we just use the width of 'm'.
	if (e != null)
	pixelX = (int) e.nextTabStop((float) pixelX,
	startOffset + offset - s.offset);
	else
	pixelX += metrics.charWidth(' ');
	break;
	case '\n':
	// In case we have a newline, we must 'draw'
	// the buffer and jump on the next line.
	pixelX += metrics.charWidth(buffer[offset]);
	maxWidth = Math.max(maxWidth, pixelX - x);
	pixelX = x;
	break;
	default:
	// Here we draw the char.
	pixelX += metrics.charWidth(buffer[offset]);
	break;
	}
	}

	// Take the last line into account.
	maxWidth = Math.max(maxWidth, pixelX - x);

	return maxWidth;
	}
	}