mirror of git://gcc.gnu.org/git/gcc.git
731 lines
23 KiB
Java
731 lines
23 KiB
Java
/* Utilities.java --
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Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text;
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import java.awt.FontMetrics;
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import java.awt.Graphics;
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import java.awt.Point;
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import java.text.BreakIterator;
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import javax.swing.text.Position.Bias;
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/**
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* A set of utilities to deal with text. This is used by several other classes
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* inside this package.
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*
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* @author Roman Kennke (roman@ontographics.com)
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* @author Robert Schuster (robertschuster@fsfe.org)
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*/
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public class Utilities
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{
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/**
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* Creates a new <code>Utilities</code> object.
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*/
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public Utilities()
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{
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// Nothing to be done here.
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}
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/**
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* Draws the given text segment. Contained tabs and newline characters
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* are taken into account. Tabs are expanded using the
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* specified {@link TabExpander}.
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*
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*
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* The X and Y coordinates denote the start of the <em>baseline</em> where
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* the text should be drawn.
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*
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* @param s the text fragment to be drawn.
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* @param x the x position for drawing.
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* @param y the y position for drawing.
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* @param g the {@link Graphics} context for drawing.
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* @param e the {@link TabExpander} which specifies the Tab-expanding
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* technique.
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* @param startOffset starting offset in the text.
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* @return the x coordinate at the end of the drawn text.
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*/
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public static final int drawTabbedText(Segment s, int x, int y, Graphics g,
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TabExpander e, int startOffset)
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{
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// This buffers the chars to be drawn.
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char[] buffer = s.array;
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// The font metrics of the current selected font.
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FontMetrics metrics = g.getFontMetrics();
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int ascent = metrics.getAscent();
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// The current x and y pixel coordinates.
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int pixelX = x;
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int pos = s.offset;
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int len = 0;
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int end = s.offset + s.count;
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for (int offset = s.offset; offset < end; ++offset)
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{
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char c = buffer[offset];
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switch (c)
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{
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case '\t':
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if (len > 0) {
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g.drawChars(buffer, pos, len, pixelX, y);
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pixelX += metrics.charsWidth(buffer, pos, len);
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len = 0;
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}
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pos = offset+1;
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if (e != null)
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pixelX = (int) e.nextTabStop((float) pixelX, startOffset + offset
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- s.offset);
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else
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pixelX += metrics.charWidth(' ');
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x = pixelX;
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break;
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case '\n':
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case '\r':
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if (len > 0) {
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g.drawChars(buffer, pos, len, pixelX, y);
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pixelX += metrics.charsWidth(buffer, pos, len);
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len = 0;
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}
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x = pixelX;
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break;
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default:
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len += 1;
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}
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}
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if (len > 0)
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{
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g.drawChars(buffer, pos, len, pixelX, y);
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pixelX += metrics.charsWidth(buffer, pos, len);
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}
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return pixelX;
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}
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/**
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* Determines the width, that the given text <code>s</code> would take
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* if it was printed with the given {@link java.awt.FontMetrics} on the
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* specified screen position.
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* @param s the text fragment
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* @param metrics the font metrics of the font to be used
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* @param x the x coordinate of the point at which drawing should be done
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* @param e the {@link TabExpander} to be used
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* @param startOffset the index in <code>s</code> where to start
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* @returns the width of the given text s. This takes tabs and newlines
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* into account.
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*/
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public static final int getTabbedTextWidth(Segment s, FontMetrics metrics,
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int x, TabExpander e,
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int startOffset)
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{
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// This buffers the chars to be drawn.
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char[] buffer = s.array;
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// The current x coordinate.
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int pixelX = x;
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// The current maximum width.
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int maxWidth = 0;
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int end = s.offset + s.count;
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int count = 0;
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for (int offset = s.offset; offset < end; offset++)
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{
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switch (buffer[offset])
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{
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case '\t':
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// In case we have a tab, we just 'jump' over the tab.
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// When we have no tab expander we just use the width of 'm'.
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if (e != null)
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pixelX = (int) e.nextTabStop(pixelX,
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startOffset + offset - s.offset);
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else
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pixelX += metrics.charWidth(' ');
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break;
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case '\n':
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// In case we have a newline, we must 'draw'
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// the buffer and jump on the next line.
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pixelX += metrics.charsWidth(buffer, offset - count, count);
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count = 0;
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break;
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default:
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count++;
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}
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}
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// Take the last line into account.
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pixelX += metrics.charsWidth(buffer, end - count, count);
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return pixelX - x;
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}
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/**
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* Provides a facility to map screen coordinates into a model location. For a
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* given text fragment and start location within this fragment, this method
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* determines the model location so that the resulting fragment fits best
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* into the span <code>[x0, x]</code>.
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*
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* The parameter <code>round</code> controls which model location is returned
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* if the view coordinates are on a character: If <code>round</code> is
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* <code>true</code>, then the result is rounded up to the next character, so
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* that the resulting fragment is the smallest fragment that is larger than
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* the specified span. If <code>round</code> is <code>false</code>, then the
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* resulting fragment is the largest fragment that is smaller than the
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* specified span.
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*
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* @param s the text segment
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* @param fm the font metrics to use
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* @param x0 the starting screen location
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* @param x the target screen location at which the requested fragment should
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* end
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* @param te the tab expander to use; if this is <code>null</code>, TABs are
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* expanded to one space character
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* @param p0 the starting model location
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* @param round if <code>true</code> round up to the next location, otherwise
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* round down to the current location
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*
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* @return the model location, so that the resulting fragment fits within the
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* specified span
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*/
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public static final int getTabbedTextOffset(Segment s, FontMetrics fm, int x0,
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int x, TabExpander te, int p0,
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boolean round)
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{
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int found = s.count;
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int currentX = x0;
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int nextX = currentX;
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int end = s.offset + s.count;
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for (int pos = s.offset; pos < end && found == s.count; pos++)
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{
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char nextChar = s.array[pos];
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if (nextChar != '\t')
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nextX += fm.charWidth(nextChar);
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else
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{
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if (te == null)
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nextX += fm.charWidth(' ');
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else
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nextX += ((int) te.nextTabStop(nextX, p0 + pos - s.offset));
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}
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if (x >= currentX && x < nextX)
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{
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// Found position.
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if ((! round) || ((x - currentX) < (nextX - x)))
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{
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found = pos - s.offset;
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}
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else
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{
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found = pos + 1 - s.offset;
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}
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}
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currentX = nextX;
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}
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return found;
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}
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/**
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* Provides a facility to map screen coordinates into a model location. For a
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* given text fragment and start location within this fragment, this method
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* determines the model location so that the resulting fragment fits best
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* into the span <code>[x0, x]</code>.
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*
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* This method rounds up to the next location, so that the resulting fragment
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* will be the smallest fragment of the text, that is greater than the
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* specified span.
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*
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* @param s the text segment
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* @param fm the font metrics to use
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* @param x0 the starting screen location
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* @param x the target screen location at which the requested fragment should
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* end
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* @param te the tab expander to use; if this is <code>null</code>, TABs are
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* expanded to one space character
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* @param p0 the starting model location
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*
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* @return the model location, so that the resulting fragment fits within the
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* specified span
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*/
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public static final int getTabbedTextOffset(Segment s, FontMetrics fm, int x0,
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int x, TabExpander te, int p0)
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{
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return getTabbedTextOffset(s, fm, x0, x, te, p0, true);
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}
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/**
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* Finds the start of the next word for the given offset.
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*
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* @param c
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* the text component
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* @param offs
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* the offset in the document
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* @return the location in the model of the start of the next word.
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* @throws BadLocationException
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* if the offset is invalid.
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*/
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public static final int getNextWord(JTextComponent c, int offs)
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throws BadLocationException
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{
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if (offs < 0 || offs > (c.getText().length() - 1))
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throw new BadLocationException("invalid offset specified", offs);
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String text = c.getText();
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BreakIterator wb = BreakIterator.getWordInstance();
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wb.setText(text);
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int last = wb.following(offs);
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int current = wb.next();
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int cp;
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while (current != BreakIterator.DONE)
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{
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for (int i = last; i < current; i++)
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{
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cp = text.codePointAt(i);
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// Return the last found bound if there is a letter at the current
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// location or is not whitespace (meaning it is a number or
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// punctuation). The first case means that 'last' denotes the
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// beginning of a word while the second case means it is the start
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// of something else.
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if (Character.isLetter(cp)
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|| !Character.isWhitespace(cp))
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return last;
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}
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last = current;
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current = wb.next();
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}
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throw new BadLocationException("no more words", offs);
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}
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/**
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* Finds the start of the previous word for the given offset.
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*
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* @param c
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* the text component
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* @param offs
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* the offset in the document
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* @return the location in the model of the start of the previous word.
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* @throws BadLocationException
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* if the offset is invalid.
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*/
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public static final int getPreviousWord(JTextComponent c, int offs)
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throws BadLocationException
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{
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String text = c.getText();
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if (offs <= 0 || offs > text.length())
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throw new BadLocationException("invalid offset specified", offs);
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BreakIterator wb = BreakIterator.getWordInstance();
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wb.setText(text);
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int last = wb.preceding(offs);
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int current = wb.previous();
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int cp;
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while (current != BreakIterator.DONE)
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{
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for (int i = last; i < offs; i++)
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{
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cp = text.codePointAt(i);
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// Return the last found bound if there is a letter at the current
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// location or is not whitespace (meaning it is a number or
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// punctuation). The first case means that 'last' denotes the
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// beginning of a word while the second case means it is the start
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// of some else.
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if (Character.isLetter(cp)
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|| !Character.isWhitespace(cp))
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return last;
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}
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last = current;
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current = wb.previous();
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}
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return 0;
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}
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/**
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* Finds the start of a word for the given location.
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* @param c the text component
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* @param offs the offset location
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* @return the location of the word beginning
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* @throws BadLocationException if the offset location is invalid
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*/
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public static final int getWordStart(JTextComponent c, int offs)
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throws BadLocationException
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{
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String text = c.getText();
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if (offs < 0 || offs > text.length())
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throw new BadLocationException("invalid offset specified", offs);
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BreakIterator wb = BreakIterator.getWordInstance();
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wb.setText(text);
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if (wb.isBoundary(offs))
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return offs;
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return wb.preceding(offs);
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}
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/**
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* Finds the end of a word for the given location.
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* @param c the text component
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* @param offs the offset location
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* @return the location of the word end
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* @throws BadLocationException if the offset location is invalid
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*/
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public static final int getWordEnd(JTextComponent c, int offs)
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throws BadLocationException
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{
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if (offs < 0 || offs >= c.getText().length())
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throw new BadLocationException("invalid offset specified", offs);
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String text = c.getText();
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BreakIterator wb = BreakIterator.getWordInstance();
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wb.setText(text);
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return wb.following(offs);
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}
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/**
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* Get the model position of the end of the row that contains the
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* specified model position. Return null if the given JTextComponent
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* does not have a size.
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* @param c the JTextComponent
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* @param offs the model position
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* @return the model position of the end of the row containing the given
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* offset
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* @throws BadLocationException if the offset is invalid
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*/
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public static final int getRowEnd(JTextComponent c, int offs)
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throws BadLocationException
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{
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String text = c.getText();
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if (text == null)
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return -1;
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// Do a binary search for the smallest position X > offs
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// such that that character at positino X is not on the same
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// line as the character at position offs
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int high = offs + ((text.length() - 1 - offs) / 2);
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int low = offs;
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int oldHigh = text.length() + 1;
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while (true)
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{
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if (c.modelToView(high).y != c.modelToView(offs).y)
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{
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oldHigh = high;
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high = low + ((high + 1 - low) / 2);
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if (oldHigh == high)
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return high - 1;
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}
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else
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{
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low = high;
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high += ((oldHigh - high) / 2);
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if (low == high)
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return low;
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}
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}
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}
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/**
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* Get the model position of the start of the row that contains the specified
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* model position. Return null if the given JTextComponent does not have a
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* size.
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*
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* @param c the JTextComponent
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* @param offs the model position
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* @return the model position of the start of the row containing the given
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* offset
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* @throws BadLocationException if the offset is invalid
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*/
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public static final int getRowStart(JTextComponent c, int offs)
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throws BadLocationException
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{
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String text = c.getText();
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if (text == null)
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return -1;
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// Do a binary search for the greatest position X < offs
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// such that the character at position X is not on the same
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// row as the character at position offs
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int high = offs;
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int low = 0;
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int oldLow = 0;
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while (true)
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{
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if (c.modelToView(low).y != c.modelToView(offs).y)
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{
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oldLow = low;
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low = high - ((high + 1 - low) / 2);
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if (oldLow == low)
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return low + 1;
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}
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else
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{
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high = low;
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low -= ((low - oldLow) / 2);
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if (low == high)
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return low;
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}
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}
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}
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/**
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* Determine where to break the text in the given Segment, attempting to find
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* a word boundary.
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* @param s the Segment that holds the text
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* @param metrics the font metrics used for calculating the break point
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* @param x0 starting view location representing the start of the text
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* @param x the target view location
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* @param e the TabExpander used for expanding tabs (if this is null tabs
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* are expanded to 1 space)
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* @param startOffset the offset in the Document of the start of the text
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* @return the offset at which we should break the text
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*/
|
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public static final int getBreakLocation(Segment s, FontMetrics metrics,
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int x0, int x, TabExpander e,
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int startOffset)
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{
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int mark = Utilities.getTabbedTextOffset(s, metrics, x0, x, e, startOffset,
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false);
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int breakLoc = mark;
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// If mark is equal to the end of the string, just use that position.
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if (mark < s.count - 1)
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{
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for (int i = s.offset + mark; i >= s.offset; i--)
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|
{
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char ch = s.array[i];
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|
if (ch < 256)
|
|
{
|
|
// For ASCII simply scan backwards for whitespace.
|
|
if (Character.isWhitespace(ch))
|
|
{
|
|
breakLoc = i - s.offset + 1;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Only query BreakIterator for complex chars.
|
|
BreakIterator bi = BreakIterator.getLineInstance();
|
|
bi.setText(s);
|
|
int pos = bi.preceding(i + 1);
|
|
if (pos > s.offset)
|
|
{
|
|
breakLoc = breakLoc - s.offset;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return breakLoc;
|
|
}
|
|
|
|
/**
|
|
* Returns the paragraph element in the text component <code>c</code> at
|
|
* the specified location <code>offset</code>.
|
|
*
|
|
* @param c the text component
|
|
* @param offset the offset of the paragraph element to return
|
|
*
|
|
* @return the paragraph element at <code>offset</code>
|
|
*/
|
|
public static final Element getParagraphElement(JTextComponent c, int offset)
|
|
{
|
|
Document doc = c.getDocument();
|
|
Element par = null;
|
|
if (doc instanceof StyledDocument)
|
|
{
|
|
StyledDocument styledDoc = (StyledDocument) doc;
|
|
par = styledDoc.getParagraphElement(offset);
|
|
}
|
|
else
|
|
{
|
|
Element root = c.getDocument().getDefaultRootElement();
|
|
int parIndex = root.getElementIndex(offset);
|
|
par = root.getElement(parIndex);
|
|
}
|
|
return par;
|
|
}
|
|
|
|
/**
|
|
* Returns the document position that is closest above to the specified x
|
|
* coordinate in the row containing <code>offset</code>.
|
|
*
|
|
* @param c the text component
|
|
* @param offset the offset
|
|
* @param x the x coordinate
|
|
*
|
|
* @return the document position that is closest above to the specified x
|
|
* coordinate in the row containing <code>offset</code>
|
|
*
|
|
* @throws BadLocationException if <code>offset</code> is not a valid offset
|
|
*/
|
|
public static final int getPositionAbove(JTextComponent c, int offset, int x)
|
|
throws BadLocationException
|
|
{
|
|
int offs = getRowStart(c, offset);
|
|
|
|
if(offs == -1)
|
|
return -1;
|
|
|
|
// Effectively calculates the y value of the previous line.
|
|
Point pt = c.modelToView(offs-1).getLocation();
|
|
|
|
pt.x = x;
|
|
|
|
// Calculate a simple fitting offset.
|
|
offs = c.viewToModel(pt);
|
|
|
|
// Find out the real x positions of the calculated character and its
|
|
// neighbour.
|
|
int offsX = c.modelToView(offs).getLocation().x;
|
|
int offsXNext = c.modelToView(offs+1).getLocation().x;
|
|
|
|
// Chose the one which is nearer to us and return its offset.
|
|
if (Math.abs(offsX-x) <= Math.abs(offsXNext-x))
|
|
return offs;
|
|
else
|
|
return offs+1;
|
|
}
|
|
|
|
/**
|
|
* Returns the document position that is closest below to the specified x
|
|
* coordinate in the row containing <code>offset</code>.
|
|
*
|
|
* @param c the text component
|
|
* @param offset the offset
|
|
* @param x the x coordinate
|
|
*
|
|
* @return the document position that is closest above to the specified x
|
|
* coordinate in the row containing <code>offset</code>
|
|
*
|
|
* @throws BadLocationException if <code>offset</code> is not a valid offset
|
|
*/
|
|
public static final int getPositionBelow(JTextComponent c, int offset, int x)
|
|
throws BadLocationException
|
|
{
|
|
int offs = getRowEnd(c, offset);
|
|
|
|
if(offs == -1)
|
|
return -1;
|
|
|
|
Point pt = null;
|
|
|
|
// Note: Some views represent the position after the last
|
|
// typed character others do not. Converting offset 3 in "a\nb"
|
|
// in a PlainView will return a valid rectangle while in a
|
|
// WrappedPlainView this will throw a BadLocationException.
|
|
// This behavior has been observed in the RI.
|
|
try
|
|
{
|
|
// Effectively calculates the y value of the next line.
|
|
pt = c.modelToView(offs+1).getLocation();
|
|
}
|
|
catch(BadLocationException ble)
|
|
{
|
|
return offset;
|
|
}
|
|
|
|
pt.x = x;
|
|
|
|
// Calculate a simple fitting offset.
|
|
offs = c.viewToModel(pt);
|
|
|
|
if (offs == c.getDocument().getLength())
|
|
return offs;
|
|
|
|
// Find out the real x positions of the calculated character and its
|
|
// neighbour.
|
|
int offsX = c.modelToView(offs).getLocation().x;
|
|
int offsXNext = c.modelToView(offs+1).getLocation().x;
|
|
|
|
// Chose the one which is nearer to us and return its offset.
|
|
if (Math.abs(offsX-x) <= Math.abs(offsXNext-x))
|
|
return offs;
|
|
else
|
|
return offs+1;
|
|
}
|
|
|
|
/** This is an internal helper method which is used by the
|
|
* <code>javax.swing.text</code> package. It simply delegates the
|
|
* call to a method with the same name on the <code>NavigationFilter</code>
|
|
* of the provided <code>JTextComponent</code> (if it has one) or its UI.
|
|
*
|
|
* If the underlying method throws a <code>BadLocationException</code> it
|
|
* will be swallowed and the initial offset is returned.
|
|
*/
|
|
static int getNextVisualPositionFrom(JTextComponent t, int offset, int direction)
|
|
{
|
|
NavigationFilter nf = t.getNavigationFilter();
|
|
|
|
try
|
|
{
|
|
return (nf != null)
|
|
? nf.getNextVisualPositionFrom(t,
|
|
offset,
|
|
Bias.Forward,
|
|
direction,
|
|
new Position.Bias[1])
|
|
: t.getUI().getNextVisualPositionFrom(t,
|
|
offset,
|
|
Bias.Forward,
|
|
direction,
|
|
new Position.Bias[1]);
|
|
}
|
|
catch (BadLocationException ble)
|
|
{
|
|
return offset;
|
|
}
|
|
|
|
}
|
|
|
|
}
|