author | rupashka |
Mon, 11 Apr 2011 19:55:15 +0400 | |
changeset 9218 | 883c22142aa9 |
parent 8533 | 0537e84f6e69 |
child 9232 | 9e29d6359705 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package javax.swing.text; |
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import java.lang.reflect.Method; |
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import java.awt.Component; |
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import java.awt.Rectangle; |
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import java.awt.Graphics; |
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import java.awt.FontMetrics; |
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import java.awt.Shape; |
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import java.awt.Toolkit; |
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import java.awt.Graphics2D; |
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import java.awt.font.FontRenderContext; |
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import java.awt.font.TextLayout; |
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import java.awt.font.TextAttribute; |
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import java.text.*; |
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import javax.swing.JComponent; |
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import javax.swing.SwingConstants; |
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import javax.swing.text.ParagraphView.Row; |
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import sun.swing.SwingUtilities2; |
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/** |
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* A collection of methods to deal with various text |
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* related activities. |
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* |
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* @author Timothy Prinzing |
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*/ |
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public class Utilities { |
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/** |
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* If <code>view</code>'s container is a <code>JComponent</code> it |
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* is returned, after casting. |
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*/ |
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static JComponent getJComponent(View view) { |
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if (view != null) { |
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Component component = view.getContainer(); |
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if (component instanceof JComponent) { |
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return (JComponent)component; |
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} |
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} |
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return null; |
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} |
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/** |
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* Draws the given text, expanding any tabs that are contained |
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* using the given tab expansion technique. This particular |
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* implementation renders in a 1.1 style coordinate system |
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* where ints are used and 72dpi is assumed. |
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* |
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* @param s the source of the text |
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* @param x the X origin >= 0 |
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* @param y the Y origin >= 0 |
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* @param g the graphics context |
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* @param e how to expand the tabs. If this value is null, |
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* tabs will be expanded as a space character. |
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* @param startOffset starting offset of the text in the document >= 0 |
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* @return the X location at the end of the rendered 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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return drawTabbedText(null, s, x, y, g, e, startOffset); |
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} |
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/** |
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* Draws the given text, expanding any tabs that are contained |
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* using the given tab expansion technique. This particular |
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* implementation renders in a 1.1 style coordinate system |
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* where ints are used and 72dpi is assumed. |
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* |
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* @param view View requesting rendering, may be null. |
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* @param s the source of the text |
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* @param x the X origin >= 0 |
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* @param y the Y origin >= 0 |
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* @param g the graphics context |
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* @param e how to expand the tabs. If this value is null, |
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* tabs will be expanded as a space character. |
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* @param startOffset starting offset of the text in the document >= 0 |
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* @return the X location at the end of the rendered text |
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*/ |
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static final int drawTabbedText(View view, |
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Segment s, int x, int y, Graphics g, |
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TabExpander e, int startOffset) { |
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return drawTabbedText(view, s, x, y, g, e, startOffset, null); |
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} |
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// In addition to the previous method it can extend spaces for |
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// justification. |
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// |
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// all params are the same as in the preious method except the last |
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// one: |
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// @param justificationData justificationData for the row. |
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// if null not justification is needed |
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static final int drawTabbedText(View view, |
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Segment s, int x, int y, Graphics g, |
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TabExpander e, int startOffset, |
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int [] justificationData) { |
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JComponent component = getJComponent(view); |
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FontMetrics metrics = SwingUtilities2.getFontMetrics(component, g); |
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int nextX = x; |
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char[] txt = s.array; |
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int txtOffset = s.offset; |
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int flushLen = 0; |
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int flushIndex = s.offset; |
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int spaceAddon = 0; |
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int spaceAddonLeftoverEnd = -1; |
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int startJustifiableContent = 0; |
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int endJustifiableContent = 0; |
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if (justificationData != null) { |
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int offset = - startOffset + txtOffset; |
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View parent = null; |
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if (view != null |
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&& (parent = view.getParent()) != null) { |
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offset += parent.getStartOffset(); |
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} |
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spaceAddon = |
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justificationData[Row.SPACE_ADDON]; |
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spaceAddonLeftoverEnd = |
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justificationData[Row.SPACE_ADDON_LEFTOVER_END] + offset; |
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startJustifiableContent = |
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justificationData[Row.START_JUSTIFIABLE] + offset; |
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endJustifiableContent = |
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justificationData[Row.END_JUSTIFIABLE] + offset; |
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} |
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int n = s.offset + s.count; |
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for (int i = txtOffset; i < n; i++) { |
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if (txt[i] == '\t' |
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|| ((spaceAddon != 0 || i <= spaceAddonLeftoverEnd) |
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&& (txt[i] == ' ') |
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&& startJustifiableContent <= i |
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&& i <= endJustifiableContent |
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)) { |
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if (flushLen > 0) { |
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nextX = SwingUtilities2.drawChars(component, g, txt, |
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flushIndex, flushLen, x, y); |
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flushLen = 0; |
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} |
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flushIndex = i + 1; |
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if (txt[i] == '\t') { |
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if (e != null) { |
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nextX = (int) e.nextTabStop((float) nextX, startOffset + i - txtOffset); |
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} else { |
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nextX += metrics.charWidth(' '); |
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} |
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} else if (txt[i] == ' ') { |
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nextX += metrics.charWidth(' ') + spaceAddon; |
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if (i <= spaceAddonLeftoverEnd) { |
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nextX++; |
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} |
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} |
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x = nextX; |
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} else if ((txt[i] == '\n') || (txt[i] == '\r')) { |
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if (flushLen > 0) { |
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nextX = SwingUtilities2.drawChars(component, g, txt, |
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flushIndex, flushLen, x, y); |
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flushLen = 0; |
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} |
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flushIndex = i + 1; |
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x = nextX; |
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} else { |
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flushLen += 1; |
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} |
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} |
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if (flushLen > 0) { |
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nextX = SwingUtilities2.drawChars(component, g,txt, flushIndex, |
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flushLen, x, y); |
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} |
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return nextX; |
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} |
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/** |
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* Determines the width of the given segment of text taking tabs |
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* into consideration. This is implemented in a 1.1 style coordinate |
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* system where ints are used and 72dpi is assumed. |
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* |
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* @param s the source of the text |
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* @param metrics the font metrics to use for the calculation |
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* @param x the X origin >= 0 |
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* @param e how to expand the tabs. If this value is null, |
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* tabs will be expanded as a space character. |
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* @param startOffset starting offset of the text in the document >= 0 |
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* @return the width of the text |
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*/ |
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public static final int getTabbedTextWidth(Segment s, FontMetrics metrics, int x, |
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TabExpander e, int startOffset) { |
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return getTabbedTextWidth(null, s, metrics, x, e, startOffset, null); |
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} |
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// In addition to the previous method it can extend spaces for |
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// justification. |
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// |
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// all params are the same as in the preious method except the last |
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// one: |
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// @param justificationData justificationData for the row. |
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// if null not justification is needed |
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static final int getTabbedTextWidth(View view, Segment s, FontMetrics metrics, int x, |
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TabExpander e, int startOffset, |
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int[] justificationData) { |
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int nextX = x; |
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char[] txt = s.array; |
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int txtOffset = s.offset; |
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int n = s.offset + s.count; |
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int charCount = 0; |
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int spaceAddon = 0; |
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int spaceAddonLeftoverEnd = -1; |
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int startJustifiableContent = 0; |
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int endJustifiableContent = 0; |
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if (justificationData != null) { |
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int offset = - startOffset + txtOffset; |
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View parent = null; |
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if (view != null |
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&& (parent = view.getParent()) != null) { |
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offset += parent.getStartOffset(); |
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} |
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spaceAddon = |
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justificationData[Row.SPACE_ADDON]; |
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spaceAddonLeftoverEnd = |
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justificationData[Row.SPACE_ADDON_LEFTOVER_END] + offset; |
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startJustifiableContent = |
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justificationData[Row.START_JUSTIFIABLE] + offset; |
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endJustifiableContent = |
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justificationData[Row.END_JUSTIFIABLE] + offset; |
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} |
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for (int i = txtOffset; i < n; i++) { |
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if (txt[i] == '\t' |
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|| ((spaceAddon != 0 || i <= spaceAddonLeftoverEnd) |
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&& (txt[i] == ' ') |
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&& startJustifiableContent <= i |
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&& i <= endJustifiableContent |
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)) { |
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nextX += metrics.charsWidth(txt, i-charCount, charCount); |
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charCount = 0; |
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if (txt[i] == '\t') { |
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if (e != null) { |
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nextX = (int) e.nextTabStop((float) nextX, |
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startOffset + i - txtOffset); |
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} else { |
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nextX += metrics.charWidth(' '); |
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} |
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} else if (txt[i] == ' ') { |
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nextX += metrics.charWidth(' ') + spaceAddon; |
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if (i <= spaceAddonLeftoverEnd) { |
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nextX++; |
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} |
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} |
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} else if(txt[i] == '\n') { |
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// Ignore newlines, they take up space and we shouldn't be |
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// counting them. |
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nextX += metrics.charsWidth(txt, i - charCount, charCount); |
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charCount = 0; |
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} else { |
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charCount++; |
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} |
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} |
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nextX += metrics.charsWidth(txt, n - charCount, charCount); |
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return nextX - x; |
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} |
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/** |
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* Determines the relative offset into the given text that |
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* best represents the given span in the view coordinate |
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* system. This is implemented in a 1.1 style coordinate |
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* system where ints are used and 72dpi is assumed. |
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* |
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* @param s the source of the text |
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* @param metrics the font metrics to use for the calculation |
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* @param x0 the starting view location representing the start |
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* of the given text >= 0. |
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* @param x the target view location to translate to an |
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* offset into the text >= 0. |
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* @param e how to expand the tabs. If this value is null, |
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* tabs will be expanded as a space character. |
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* @param startOffset starting offset of the text in the document >= 0 |
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* @return the offset into the text >= 0 |
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*/ |
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public static final int getTabbedTextOffset(Segment s, FontMetrics metrics, |
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int x0, int x, TabExpander e, |
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int startOffset) { |
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return getTabbedTextOffset(s, metrics, x0, x, e, startOffset, true); |
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} |
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static final int getTabbedTextOffset(View view, Segment s, FontMetrics metrics, |
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int x0, int x, TabExpander e, |
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int startOffset, |
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int[] justificationData) { |
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return getTabbedTextOffset(view, s, metrics, x0, x, e, startOffset, true, |
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justificationData); |
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} |
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public static final int getTabbedTextOffset(Segment s, |
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FontMetrics metrics, |
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int x0, int x, TabExpander e, |
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int startOffset, |
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boolean round) { |
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return getTabbedTextOffset(null, s, metrics, x0, x, e, startOffset, round, null); |
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} |
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||
322 |
// In addition to the previous method it can extend spaces for |
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323 |
// justification. |
|
324 |
// |
|
325 |
// all params are the same as in the preious method except the last |
|
326 |
// one: |
|
327 |
// @param justificationData justificationData for the row. |
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328 |
// if null not justification is needed |
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329 |
static final int getTabbedTextOffset(View view, |
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Segment s, |
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FontMetrics metrics, |
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int x0, int x, TabExpander e, |
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int startOffset, |
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boolean round, |
|
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int[] justificationData) { |
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336 |
if (x0 >= x) { |
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337 |
// x before x0, return. |
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338 |
return 0; |
|
339 |
} |
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int currX = x0; |
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int nextX = currX; |
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// s may be a shared segment, so it is copied prior to calling |
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343 |
// the tab expander |
|
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char[] txt = s.array; |
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int txtOffset = s.offset; |
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346 |
int txtCount = s.count; |
|
347 |
int spaceAddon = 0 ; |
|
348 |
int spaceAddonLeftoverEnd = -1; |
|
349 |
int startJustifiableContent = 0 ; |
|
350 |
int endJustifiableContent = 0; |
|
351 |
if (justificationData != null) { |
|
352 |
int offset = - startOffset + txtOffset; |
|
353 |
View parent = null; |
|
354 |
if (view != null |
|
355 |
&& (parent = view.getParent()) != null) { |
|
356 |
offset += parent.getStartOffset(); |
|
357 |
} |
|
358 |
spaceAddon = |
|
359 |
justificationData[Row.SPACE_ADDON]; |
|
360 |
spaceAddonLeftoverEnd = |
|
361 |
justificationData[Row.SPACE_ADDON_LEFTOVER_END] + offset; |
|
362 |
startJustifiableContent = |
|
363 |
justificationData[Row.START_JUSTIFIABLE] + offset; |
|
364 |
endJustifiableContent = |
|
365 |
justificationData[Row.END_JUSTIFIABLE] + offset; |
|
366 |
} |
|
367 |
int n = s.offset + s.count; |
|
368 |
for (int i = s.offset; i < n; i++) { |
|
369 |
if (txt[i] == '\t' |
|
370 |
|| ((spaceAddon != 0 || i <= spaceAddonLeftoverEnd) |
|
371 |
&& (txt[i] == ' ') |
|
372 |
&& startJustifiableContent <= i |
|
373 |
&& i <= endJustifiableContent |
|
374 |
)){ |
|
375 |
if (txt[i] == '\t') { |
|
376 |
if (e != null) { |
|
377 |
nextX = (int) e.nextTabStop((float) nextX, |
|
378 |
startOffset + i - txtOffset); |
|
379 |
} else { |
|
380 |
nextX += metrics.charWidth(' '); |
|
381 |
} |
|
382 |
} else if (txt[i] == ' ') { |
|
383 |
nextX += metrics.charWidth(' ') + spaceAddon; |
|
384 |
if (i <= spaceAddonLeftoverEnd) { |
|
385 |
nextX++; |
|
386 |
} |
|
387 |
} |
|
388 |
} else { |
|
389 |
nextX += metrics.charWidth(txt[i]); |
|
390 |
} |
|
391 |
if ((x >= currX) && (x < nextX)) { |
|
392 |
// found the hit position... return the appropriate side |
|
8533
0537e84f6e69
6760148: Certain fonts are not correctly soft wrapped when using JTextComponent.print()
rupashka
parents:
7668
diff
changeset
|
393 |
int offset = ((round == false) || ((x - currX) < (nextX - x))) ? |
0537e84f6e69
6760148: Certain fonts are not correctly soft wrapped when using JTextComponent.print()
rupashka
parents:
7668
diff
changeset
|
394 |
(i - txtOffset) : (i + 1 - txtOffset); |
0537e84f6e69
6760148: Certain fonts are not correctly soft wrapped when using JTextComponent.print()
rupashka
parents:
7668
diff
changeset
|
395 |
// the length of the string measured as a whole may differ from |
0537e84f6e69
6760148: Certain fonts are not correctly soft wrapped when using JTextComponent.print()
rupashka
parents:
7668
diff
changeset
|
396 |
// the sum of individual character lengths, for example if |
0537e84f6e69
6760148: Certain fonts are not correctly soft wrapped when using JTextComponent.print()
rupashka
parents:
7668
diff
changeset
|
397 |
// fractional metrics are enabled; and we must guard from this. |
9218
883c22142aa9
7030623: closed/javax/accessibility/4864610/bug4864610.java test fails just against jdk7 b134
rupashka
parents:
8533
diff
changeset
|
398 |
while (offset > 0 && metrics.charsWidth(txt, txtOffset, offset) > (x - x0)) { |
8533
0537e84f6e69
6760148: Certain fonts are not correctly soft wrapped when using JTextComponent.print()
rupashka
parents:
7668
diff
changeset
|
399 |
offset--; |
2 | 400 |
} |
9218
883c22142aa9
7030623: closed/javax/accessibility/4864610/bug4864610.java test fails just against jdk7 b134
rupashka
parents:
8533
diff
changeset
|
401 |
return offset; |
2 | 402 |
} |
403 |
currX = nextX; |
|
404 |
} |
|
405 |
||
406 |
// didn't find, return end offset |
|
407 |
return txtCount; |
|
408 |
} |
|
409 |
||
410 |
/** |
|
411 |
* Determine where to break the given text to fit |
|
412 |
* within the given span. This tries to find a word boundary. |
|
413 |
* @param s the source of the text |
|
414 |
* @param metrics the font metrics to use for the calculation |
|
415 |
* @param x0 the starting view location representing the start |
|
416 |
* of the given text. |
|
417 |
* @param x the target view location to translate to an |
|
418 |
* offset into the text. |
|
419 |
* @param e how to expand the tabs. If this value is null, |
|
420 |
* tabs will be expanded as a space character. |
|
421 |
* @param startOffset starting offset in the document of the text |
|
422 |
* @return the offset into the given text |
|
423 |
*/ |
|
424 |
public static final int getBreakLocation(Segment s, FontMetrics metrics, |
|
425 |
int x0, int x, TabExpander e, |
|
426 |
int startOffset) { |
|
427 |
char[] txt = s.array; |
|
428 |
int txtOffset = s.offset; |
|
429 |
int txtCount = s.count; |
|
430 |
int index = Utilities.getTabbedTextOffset(s, metrics, x0, x, |
|
431 |
e, startOffset, false); |
|
432 |
||
433 |
if (index >= txtCount - 1) { |
|
434 |
return txtCount; |
|
435 |
} |
|
436 |
||
437 |
for (int i = txtOffset + index; i >= txtOffset; i--) { |
|
438 |
char ch = txt[i]; |
|
439 |
if (ch < 256) { |
|
440 |
// break on whitespace |
|
441 |
if (Character.isWhitespace(ch)) { |
|
442 |
index = i - txtOffset + 1; |
|
443 |
break; |
|
444 |
} |
|
445 |
} else { |
|
446 |
// a multibyte char found; use BreakIterator to find line break |
|
447 |
BreakIterator bit = BreakIterator.getLineInstance(); |
|
448 |
bit.setText(s); |
|
449 |
int breakPos = bit.preceding(i + 1); |
|
450 |
if (breakPos > txtOffset) { |
|
451 |
index = breakPos - txtOffset; |
|
452 |
} |
|
453 |
break; |
|
454 |
} |
|
455 |
} |
|
456 |
return index; |
|
457 |
} |
|
458 |
||
459 |
/** |
|
460 |
* Determines the starting row model position of the row that contains |
|
461 |
* the specified model position. The component given must have a |
|
462 |
* size to compute the result. If the component doesn't have a size |
|
463 |
* a value of -1 will be returned. |
|
464 |
* |
|
465 |
* @param c the editor |
|
466 |
* @param offs the offset in the document >= 0 |
|
467 |
* @return the position >= 0 if the request can be computed, otherwise |
|
468 |
* a value of -1 will be returned. |
|
469 |
* @exception BadLocationException if the offset is out of range |
|
470 |
*/ |
|
471 |
public static final int getRowStart(JTextComponent c, int offs) throws BadLocationException { |
|
472 |
Rectangle r = c.modelToView(offs); |
|
473 |
if (r == null) { |
|
474 |
return -1; |
|
475 |
} |
|
476 |
int lastOffs = offs; |
|
477 |
int y = r.y; |
|
478 |
while ((r != null) && (y == r.y)) { |
|
479 |
// Skip invisible elements |
|
480 |
if(r.height !=0) { |
|
481 |
offs = lastOffs; |
|
482 |
} |
|
483 |
lastOffs -= 1; |
|
484 |
r = (lastOffs >= 0) ? c.modelToView(lastOffs) : null; |
|
485 |
} |
|
486 |
return offs; |
|
487 |
} |
|
488 |
||
489 |
/** |
|
490 |
* Determines the ending row model position of the row that contains |
|
491 |
* the specified model position. The component given must have a |
|
492 |
* size to compute the result. If the component doesn't have a size |
|
493 |
* a value of -1 will be returned. |
|
494 |
* |
|
495 |
* @param c the editor |
|
496 |
* @param offs the offset in the document >= 0 |
|
497 |
* @return the position >= 0 if the request can be computed, otherwise |
|
498 |
* a value of -1 will be returned. |
|
499 |
* @exception BadLocationException if the offset is out of range |
|
500 |
*/ |
|
501 |
public static final int getRowEnd(JTextComponent c, int offs) throws BadLocationException { |
|
502 |
Rectangle r = c.modelToView(offs); |
|
503 |
if (r == null) { |
|
504 |
return -1; |
|
505 |
} |
|
506 |
int n = c.getDocument().getLength(); |
|
507 |
int lastOffs = offs; |
|
508 |
int y = r.y; |
|
509 |
while ((r != null) && (y == r.y)) { |
|
510 |
// Skip invisible elements |
|
511 |
if (r.height !=0) { |
|
512 |
offs = lastOffs; |
|
513 |
} |
|
514 |
lastOffs += 1; |
|
515 |
r = (lastOffs <= n) ? c.modelToView(lastOffs) : null; |
|
516 |
} |
|
517 |
return offs; |
|
518 |
} |
|
519 |
||
520 |
/** |
|
521 |
* Determines the position in the model that is closest to the given |
|
522 |
* view location in the row above. The component given must have a |
|
523 |
* size to compute the result. If the component doesn't have a size |
|
524 |
* a value of -1 will be returned. |
|
525 |
* |
|
526 |
* @param c the editor |
|
527 |
* @param offs the offset in the document >= 0 |
|
528 |
* @param x the X coordinate >= 0 |
|
529 |
* @return the position >= 0 if the request can be computed, otherwise |
|
530 |
* a value of -1 will be returned. |
|
531 |
* @exception BadLocationException if the offset is out of range |
|
532 |
*/ |
|
533 |
public static final int getPositionAbove(JTextComponent c, int offs, int x) throws BadLocationException { |
|
534 |
int lastOffs = getRowStart(c, offs) - 1; |
|
535 |
if (lastOffs < 0) { |
|
536 |
return -1; |
|
537 |
} |
|
538 |
int bestSpan = Integer.MAX_VALUE; |
|
539 |
int y = 0; |
|
540 |
Rectangle r = null; |
|
541 |
if (lastOffs >= 0) { |
|
542 |
r = c.modelToView(lastOffs); |
|
543 |
y = r.y; |
|
544 |
} |
|
545 |
while ((r != null) && (y == r.y)) { |
|
546 |
int span = Math.abs(r.x - x); |
|
547 |
if (span < bestSpan) { |
|
548 |
offs = lastOffs; |
|
549 |
bestSpan = span; |
|
550 |
} |
|
551 |
lastOffs -= 1; |
|
552 |
r = (lastOffs >= 0) ? c.modelToView(lastOffs) : null; |
|
553 |
} |
|
554 |
return offs; |
|
555 |
} |
|
556 |
||
557 |
/** |
|
558 |
* Determines the position in the model that is closest to the given |
|
559 |
* view location in the row below. The component given must have a |
|
560 |
* size to compute the result. If the component doesn't have a size |
|
561 |
* a value of -1 will be returned. |
|
562 |
* |
|
563 |
* @param c the editor |
|
564 |
* @param offs the offset in the document >= 0 |
|
565 |
* @param x the X coordinate >= 0 |
|
566 |
* @return the position >= 0 if the request can be computed, otherwise |
|
567 |
* a value of -1 will be returned. |
|
568 |
* @exception BadLocationException if the offset is out of range |
|
569 |
*/ |
|
570 |
public static final int getPositionBelow(JTextComponent c, int offs, int x) throws BadLocationException { |
|
571 |
int lastOffs = getRowEnd(c, offs) + 1; |
|
572 |
if (lastOffs <= 0) { |
|
573 |
return -1; |
|
574 |
} |
|
575 |
int bestSpan = Integer.MAX_VALUE; |
|
576 |
int n = c.getDocument().getLength(); |
|
577 |
int y = 0; |
|
578 |
Rectangle r = null; |
|
579 |
if (lastOffs <= n) { |
|
580 |
r = c.modelToView(lastOffs); |
|
581 |
y = r.y; |
|
582 |
} |
|
583 |
while ((r != null) && (y == r.y)) { |
|
584 |
int span = Math.abs(x - r.x); |
|
585 |
if (span < bestSpan) { |
|
586 |
offs = lastOffs; |
|
587 |
bestSpan = span; |
|
588 |
} |
|
589 |
lastOffs += 1; |
|
590 |
r = (lastOffs <= n) ? c.modelToView(lastOffs) : null; |
|
591 |
} |
|
592 |
return offs; |
|
593 |
} |
|
594 |
||
595 |
/** |
|
596 |
* Determines the start of a word for the given model location. |
|
597 |
* Uses BreakIterator.getWordInstance() to actually get the words. |
|
598 |
* |
|
599 |
* @param c the editor |
|
600 |
* @param offs the offset in the document >= 0 |
|
601 |
* @return the location in the model of the word start >= 0 |
|
602 |
* @exception BadLocationException if the offset is out of range |
|
603 |
*/ |
|
604 |
public static final int getWordStart(JTextComponent c, int offs) throws BadLocationException { |
|
605 |
Document doc = c.getDocument(); |
|
606 |
Element line = getParagraphElement(c, offs); |
|
607 |
if (line == null) { |
|
608 |
throw new BadLocationException("No word at " + offs, offs); |
|
609 |
} |
|
610 |
int lineStart = line.getStartOffset(); |
|
611 |
int lineEnd = Math.min(line.getEndOffset(), doc.getLength()); |
|
612 |
||
613 |
Segment seg = SegmentCache.getSharedSegment(); |
|
614 |
doc.getText(lineStart, lineEnd - lineStart, seg); |
|
615 |
if(seg.count > 0) { |
|
616 |
BreakIterator words = BreakIterator.getWordInstance(c.getLocale()); |
|
617 |
words.setText(seg); |
|
618 |
int wordPosition = seg.offset + offs - lineStart; |
|
619 |
if(wordPosition >= words.last()) { |
|
620 |
wordPosition = words.last() - 1; |
|
621 |
} |
|
622 |
words.following(wordPosition); |
|
623 |
offs = lineStart + words.previous() - seg.offset; |
|
624 |
} |
|
625 |
SegmentCache.releaseSharedSegment(seg); |
|
626 |
return offs; |
|
627 |
} |
|
628 |
||
629 |
/** |
|
630 |
* Determines the end of a word for the given location. |
|
631 |
* Uses BreakIterator.getWordInstance() to actually get the words. |
|
632 |
* |
|
633 |
* @param c the editor |
|
634 |
* @param offs the offset in the document >= 0 |
|
635 |
* @return the location in the model of the word end >= 0 |
|
636 |
* @exception BadLocationException if the offset is out of range |
|
637 |
*/ |
|
638 |
public static final int getWordEnd(JTextComponent c, int offs) throws BadLocationException { |
|
639 |
Document doc = c.getDocument(); |
|
640 |
Element line = getParagraphElement(c, offs); |
|
641 |
if (line == null) { |
|
642 |
throw new BadLocationException("No word at " + offs, offs); |
|
643 |
} |
|
644 |
int lineStart = line.getStartOffset(); |
|
645 |
int lineEnd = Math.min(line.getEndOffset(), doc.getLength()); |
|
646 |
||
647 |
Segment seg = SegmentCache.getSharedSegment(); |
|
648 |
doc.getText(lineStart, lineEnd - lineStart, seg); |
|
649 |
if(seg.count > 0) { |
|
650 |
BreakIterator words = BreakIterator.getWordInstance(c.getLocale()); |
|
651 |
words.setText(seg); |
|
652 |
int wordPosition = offs - lineStart + seg.offset; |
|
653 |
if(wordPosition >= words.last()) { |
|
654 |
wordPosition = words.last() - 1; |
|
655 |
} |
|
656 |
offs = lineStart + words.following(wordPosition) - seg.offset; |
|
657 |
} |
|
658 |
SegmentCache.releaseSharedSegment(seg); |
|
659 |
return offs; |
|
660 |
} |
|
661 |
||
662 |
/** |
|
663 |
* Determines the start of the next word for the given location. |
|
664 |
* Uses BreakIterator.getWordInstance() to actually get the words. |
|
665 |
* |
|
666 |
* @param c the editor |
|
667 |
* @param offs the offset in the document >= 0 |
|
668 |
* @return the location in the model of the word start >= 0 |
|
669 |
* @exception BadLocationException if the offset is out of range |
|
670 |
*/ |
|
671 |
public static final int getNextWord(JTextComponent c, int offs) throws BadLocationException { |
|
672 |
int nextWord; |
|
673 |
Element line = getParagraphElement(c, offs); |
|
674 |
for (nextWord = getNextWordInParagraph(c, line, offs, false); |
|
675 |
nextWord == BreakIterator.DONE; |
|
676 |
nextWord = getNextWordInParagraph(c, line, offs, true)) { |
|
677 |
||
678 |
// didn't find in this line, try the next line |
|
679 |
offs = line.getEndOffset(); |
|
680 |
line = getParagraphElement(c, offs); |
|
681 |
} |
|
682 |
return nextWord; |
|
683 |
} |
|
684 |
||
685 |
/** |
|
686 |
* Finds the next word in the given elements text. The first |
|
687 |
* parameter allows searching multiple paragraphs where even |
|
688 |
* the first offset is desired. |
|
689 |
* Returns the offset of the next word, or BreakIterator.DONE |
|
690 |
* if there are no more words in the element. |
|
691 |
*/ |
|
692 |
static int getNextWordInParagraph(JTextComponent c, Element line, int offs, boolean first) throws BadLocationException { |
|
693 |
if (line == null) { |
|
694 |
throw new BadLocationException("No more words", offs); |
|
695 |
} |
|
696 |
Document doc = line.getDocument(); |
|
697 |
int lineStart = line.getStartOffset(); |
|
698 |
int lineEnd = Math.min(line.getEndOffset(), doc.getLength()); |
|
699 |
if ((offs >= lineEnd) || (offs < lineStart)) { |
|
700 |
throw new BadLocationException("No more words", offs); |
|
701 |
} |
|
702 |
Segment seg = SegmentCache.getSharedSegment(); |
|
703 |
doc.getText(lineStart, lineEnd - lineStart, seg); |
|
704 |
BreakIterator words = BreakIterator.getWordInstance(c.getLocale()); |
|
705 |
words.setText(seg); |
|
706 |
if ((first && (words.first() == (seg.offset + offs - lineStart))) && |
|
707 |
(! Character.isWhitespace(seg.array[words.first()]))) { |
|
708 |
||
709 |
return offs; |
|
710 |
} |
|
711 |
int wordPosition = words.following(seg.offset + offs - lineStart); |
|
712 |
if ((wordPosition == BreakIterator.DONE) || |
|
713 |
(wordPosition >= seg.offset + seg.count)) { |
|
714 |
// there are no more words on this line. |
|
715 |
return BreakIterator.DONE; |
|
716 |
} |
|
717 |
// if we haven't shot past the end... check to |
|
718 |
// see if the current boundary represents whitespace. |
|
719 |
// if so, we need to try again |
|
720 |
char ch = seg.array[wordPosition]; |
|
721 |
if (! Character.isWhitespace(ch)) { |
|
722 |
return lineStart + wordPosition - seg.offset; |
|
723 |
} |
|
724 |
||
725 |
// it was whitespace, try again. The assumption |
|
726 |
// is that it must be a word start if the last |
|
727 |
// one had whitespace following it. |
|
728 |
wordPosition = words.next(); |
|
729 |
if (wordPosition != BreakIterator.DONE) { |
|
730 |
offs = lineStart + wordPosition - seg.offset; |
|
731 |
if (offs != lineEnd) { |
|
732 |
return offs; |
|
733 |
} |
|
734 |
} |
|
735 |
SegmentCache.releaseSharedSegment(seg); |
|
736 |
return BreakIterator.DONE; |
|
737 |
} |
|
738 |
||
739 |
||
740 |
/** |
|
741 |
* Determine the start of the prev word for the given location. |
|
742 |
* Uses BreakIterator.getWordInstance() to actually get the words. |
|
743 |
* |
|
744 |
* @param c the editor |
|
745 |
* @param offs the offset in the document >= 0 |
|
746 |
* @return the location in the model of the word start >= 0 |
|
747 |
* @exception BadLocationException if the offset is out of range |
|
748 |
*/ |
|
749 |
public static final int getPreviousWord(JTextComponent c, int offs) throws BadLocationException { |
|
750 |
int prevWord; |
|
751 |
Element line = getParagraphElement(c, offs); |
|
752 |
for (prevWord = getPrevWordInParagraph(c, line, offs); |
|
753 |
prevWord == BreakIterator.DONE; |
|
754 |
prevWord = getPrevWordInParagraph(c, line, offs)) { |
|
755 |
||
756 |
// didn't find in this line, try the prev line |
|
757 |
offs = line.getStartOffset() - 1; |
|
758 |
line = getParagraphElement(c, offs); |
|
759 |
} |
|
760 |
return prevWord; |
|
761 |
} |
|
762 |
||
763 |
/** |
|
764 |
* Finds the previous word in the given elements text. The first |
|
765 |
* parameter allows searching multiple paragraphs where even |
|
766 |
* the first offset is desired. |
|
767 |
* Returns the offset of the next word, or BreakIterator.DONE |
|
768 |
* if there are no more words in the element. |
|
769 |
*/ |
|
770 |
static int getPrevWordInParagraph(JTextComponent c, Element line, int offs) throws BadLocationException { |
|
771 |
if (line == null) { |
|
772 |
throw new BadLocationException("No more words", offs); |
|
773 |
} |
|
774 |
Document doc = line.getDocument(); |
|
775 |
int lineStart = line.getStartOffset(); |
|
776 |
int lineEnd = line.getEndOffset(); |
|
777 |
if ((offs > lineEnd) || (offs < lineStart)) { |
|
778 |
throw new BadLocationException("No more words", offs); |
|
779 |
} |
|
780 |
Segment seg = SegmentCache.getSharedSegment(); |
|
781 |
doc.getText(lineStart, lineEnd - lineStart, seg); |
|
782 |
BreakIterator words = BreakIterator.getWordInstance(c.getLocale()); |
|
783 |
words.setText(seg); |
|
784 |
if (words.following(seg.offset + offs - lineStart) == BreakIterator.DONE) { |
|
785 |
words.last(); |
|
786 |
} |
|
787 |
int wordPosition = words.previous(); |
|
788 |
if (wordPosition == (seg.offset + offs - lineStart)) { |
|
789 |
wordPosition = words.previous(); |
|
790 |
} |
|
791 |
||
792 |
if (wordPosition == BreakIterator.DONE) { |
|
793 |
// there are no more words on this line. |
|
794 |
return BreakIterator.DONE; |
|
795 |
} |
|
796 |
// if we haven't shot past the end... check to |
|
797 |
// see if the current boundary represents whitespace. |
|
798 |
// if so, we need to try again |
|
799 |
char ch = seg.array[wordPosition]; |
|
800 |
if (! Character.isWhitespace(ch)) { |
|
801 |
return lineStart + wordPosition - seg.offset; |
|
802 |
} |
|
803 |
||
804 |
// it was whitespace, try again. The assumption |
|
805 |
// is that it must be a word start if the last |
|
806 |
// one had whitespace following it. |
|
807 |
wordPosition = words.previous(); |
|
808 |
if (wordPosition != BreakIterator.DONE) { |
|
809 |
return lineStart + wordPosition - seg.offset; |
|
810 |
} |
|
811 |
SegmentCache.releaseSharedSegment(seg); |
|
812 |
return BreakIterator.DONE; |
|
813 |
} |
|
814 |
||
815 |
/** |
|
816 |
* Determines the element to use for a paragraph/line. |
|
817 |
* |
|
818 |
* @param c the editor |
|
819 |
* @param offs the starting offset in the document >= 0 |
|
820 |
* @return the element |
|
821 |
*/ |
|
822 |
public static final Element getParagraphElement(JTextComponent c, int offs) { |
|
823 |
Document doc = c.getDocument(); |
|
824 |
if (doc instanceof StyledDocument) { |
|
825 |
return ((StyledDocument)doc).getParagraphElement(offs); |
|
826 |
} |
|
827 |
Element map = doc.getDefaultRootElement(); |
|
828 |
int index = map.getElementIndex(offs); |
|
829 |
Element paragraph = map.getElement(index); |
|
830 |
if ((offs >= paragraph.getStartOffset()) && (offs < paragraph.getEndOffset())) { |
|
831 |
return paragraph; |
|
832 |
} |
|
833 |
return null; |
|
834 |
} |
|
835 |
||
836 |
static boolean isComposedTextElement(Document doc, int offset) { |
|
837 |
Element elem = doc.getDefaultRootElement(); |
|
838 |
while (!elem.isLeaf()) { |
|
839 |
elem = elem.getElement(elem.getElementIndex(offset)); |
|
840 |
} |
|
841 |
return isComposedTextElement(elem); |
|
842 |
} |
|
843 |
||
844 |
static boolean isComposedTextElement(Element elem) { |
|
845 |
AttributeSet as = elem.getAttributes(); |
|
846 |
return isComposedTextAttributeDefined(as); |
|
847 |
} |
|
848 |
||
849 |
static boolean isComposedTextAttributeDefined(AttributeSet as) { |
|
850 |
return ((as != null) && |
|
851 |
(as.isDefined(StyleConstants.ComposedTextAttribute))); |
|
852 |
} |
|
853 |
||
854 |
/** |
|
855 |
* Draws the given composed text passed from an input method. |
|
856 |
* |
|
857 |
* @param view View hosting text |
|
858 |
* @param attr the attributes containing the composed text |
|
859 |
* @param g the graphics context |
|
860 |
* @param x the X origin |
|
861 |
* @param y the Y origin |
|
862 |
* @param p0 starting offset in the composed text to be rendered |
|
863 |
* @param p1 ending offset in the composed text to be rendered |
|
864 |
* @return the new insertion position |
|
865 |
*/ |
|
866 |
static int drawComposedText(View view, AttributeSet attr, Graphics g, |
|
867 |
int x, int y, int p0, int p1) |
|
868 |
throws BadLocationException { |
|
869 |
Graphics2D g2d = (Graphics2D)g; |
|
870 |
AttributedString as = (AttributedString)attr.getAttribute( |
|
871 |
StyleConstants.ComposedTextAttribute); |
|
872 |
as.addAttribute(TextAttribute.FONT, g.getFont()); |
|
873 |
||
874 |
if (p0 >= p1) |
|
875 |
return x; |
|
876 |
||
877 |
AttributedCharacterIterator aci = as.getIterator(null, p0, p1); |
|
878 |
return x + (int)SwingUtilities2.drawString( |
|
879 |
getJComponent(view), g2d,aci,x,y); |
|
880 |
} |
|
881 |
||
882 |
/** |
|
883 |
* Paints the composed text in a GlyphView |
|
884 |
*/ |
|
885 |
static void paintComposedText(Graphics g, Rectangle alloc, GlyphView v) { |
|
886 |
if (g instanceof Graphics2D) { |
|
887 |
Graphics2D g2d = (Graphics2D) g; |
|
888 |
int p0 = v.getStartOffset(); |
|
889 |
int p1 = v.getEndOffset(); |
|
890 |
AttributeSet attrSet = v.getElement().getAttributes(); |
|
891 |
AttributedString as = |
|
892 |
(AttributedString)attrSet.getAttribute(StyleConstants.ComposedTextAttribute); |
|
893 |
int start = v.getElement().getStartOffset(); |
|
894 |
int y = alloc.y + alloc.height - (int)v.getGlyphPainter().getDescent(v); |
|
895 |
int x = alloc.x; |
|
896 |
||
897 |
//Add text attributes |
|
898 |
as.addAttribute(TextAttribute.FONT, v.getFont()); |
|
899 |
as.addAttribute(TextAttribute.FOREGROUND, v.getForeground()); |
|
900 |
if (StyleConstants.isBold(v.getAttributes())) { |
|
901 |
as.addAttribute(TextAttribute.WEIGHT, TextAttribute.WEIGHT_BOLD); |
|
902 |
} |
|
903 |
if (StyleConstants.isItalic(v.getAttributes())) { |
|
904 |
as.addAttribute(TextAttribute.POSTURE, TextAttribute.POSTURE_OBLIQUE); |
|
905 |
} |
|
906 |
if (v.isUnderline()) { |
|
907 |
as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON); |
|
908 |
} |
|
909 |
if (v.isStrikeThrough()) { |
|
910 |
as.addAttribute(TextAttribute.STRIKETHROUGH, TextAttribute.STRIKETHROUGH_ON); |
|
911 |
} |
|
912 |
if (v.isSuperscript()) { |
|
913 |
as.addAttribute(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUPER); |
|
914 |
} |
|
915 |
if (v.isSubscript()) { |
|
916 |
as.addAttribute(TextAttribute.SUPERSCRIPT, TextAttribute.SUPERSCRIPT_SUB); |
|
917 |
} |
|
918 |
||
919 |
// draw |
|
920 |
AttributedCharacterIterator aci = as.getIterator(null, p0 - start, p1 - start); |
|
921 |
SwingUtilities2.drawString(getJComponent(v), |
|
922 |
g2d,aci,x,y); |
|
923 |
} |
|
924 |
} |
|
925 |
||
926 |
/* |
|
927 |
* Convenience function for determining ComponentOrientation. Helps us |
|
928 |
* avoid having Munge directives throughout the code. |
|
929 |
*/ |
|
930 |
static boolean isLeftToRight( java.awt.Component c ) { |
|
931 |
return c.getComponentOrientation().isLeftToRight(); |
|
932 |
} |
|
933 |
||
934 |
||
935 |
/** |
|
936 |
* Provides a way to determine the next visually represented model |
|
937 |
* location that one might place a caret. Some views may not be visible, |
|
938 |
* they might not be in the same order found in the model, or they just |
|
939 |
* might not allow access to some of the locations in the model. |
|
940 |
* <p> |
|
941 |
* This implementation assumes the views are layed out in a logical |
|
942 |
* manner. That is, that the view at index x + 1 is visually after |
|
943 |
* the View at index x, and that the View at index x - 1 is visually |
|
944 |
* before the View at x. There is support for reversing this behavior |
|
945 |
* only if the passed in <code>View</code> is an instance of |
|
946 |
* <code>CompositeView</code>. The <code>CompositeView</code> |
|
947 |
* must then override the <code>flipEastAndWestAtEnds</code> method. |
|
948 |
* |
|
949 |
* @param v View to query |
|
950 |
* @param pos the position to convert >= 0 |
|
951 |
* @param a the allocated region to render into |
|
952 |
* @param direction the direction from the current position that can |
|
953 |
* be thought of as the arrow keys typically found on a keyboard; |
|
954 |
* this may be one of the following: |
|
955 |
* <ul> |
|
956 |
* <li><code>SwingConstants.WEST</code> |
|
957 |
* <li><code>SwingConstants.EAST</code> |
|
958 |
* <li><code>SwingConstants.NORTH</code> |
|
959 |
* <li><code>SwingConstants.SOUTH</code> |
|
960 |
* </ul> |
|
961 |
* @param biasRet an array contain the bias that was checked |
|
962 |
* @return the location within the model that best represents the next |
|
963 |
* location visual position |
|
964 |
* @exception BadLocationException |
|
965 |
* @exception IllegalArgumentException if <code>direction</code> is invalid |
|
966 |
*/ |
|
967 |
static int getNextVisualPositionFrom(View v, int pos, Position.Bias b, |
|
968 |
Shape alloc, int direction, |
|
969 |
Position.Bias[] biasRet) |
|
970 |
throws BadLocationException { |
|
971 |
if (v.getViewCount() == 0) { |
|
972 |
// Nothing to do. |
|
973 |
return pos; |
|
974 |
} |
|
975 |
boolean top = (direction == SwingConstants.NORTH || |
|
976 |
direction == SwingConstants.WEST); |
|
977 |
int retValue; |
|
978 |
if (pos == -1) { |
|
979 |
// Start from the first View. |
|
980 |
int childIndex = (top) ? v.getViewCount() - 1 : 0; |
|
981 |
View child = v.getView(childIndex); |
|
982 |
Shape childBounds = v.getChildAllocation(childIndex, alloc); |
|
983 |
retValue = child.getNextVisualPositionFrom(pos, b, childBounds, |
|
984 |
direction, biasRet); |
|
985 |
if (retValue == -1 && !top && v.getViewCount() > 1) { |
|
986 |
// Special case that should ONLY happen if first view |
|
987 |
// isn't valid (can happen when end position is put at |
|
988 |
// beginning of line. |
|
989 |
child = v.getView(1); |
|
990 |
childBounds = v.getChildAllocation(1, alloc); |
|
991 |
retValue = child.getNextVisualPositionFrom(-1, biasRet[0], |
|
992 |
childBounds, |
|
993 |
direction, biasRet); |
|
994 |
} |
|
995 |
} |
|
996 |
else { |
|
997 |
int increment = (top) ? -1 : 1; |
|
998 |
int childIndex; |
|
999 |
if (b == Position.Bias.Backward && pos > 0) { |
|
1000 |
childIndex = v.getViewIndex(pos - 1, Position.Bias.Forward); |
|
1001 |
} |
|
1002 |
else { |
|
1003 |
childIndex = v.getViewIndex(pos, Position.Bias.Forward); |
|
1004 |
} |
|
1005 |
View child = v.getView(childIndex); |
|
1006 |
Shape childBounds = v.getChildAllocation(childIndex, alloc); |
|
1007 |
retValue = child.getNextVisualPositionFrom(pos, b, childBounds, |
|
1008 |
direction, biasRet); |
|
1009 |
if ((direction == SwingConstants.EAST || |
|
1010 |
direction == SwingConstants.WEST) && |
|
1011 |
(v instanceof CompositeView) && |
|
1012 |
((CompositeView)v).flipEastAndWestAtEnds(pos, b)) { |
|
1013 |
increment *= -1; |
|
1014 |
} |
|
1015 |
childIndex += increment; |
|
1016 |
if (retValue == -1 && childIndex >= 0 && |
|
1017 |
childIndex < v.getViewCount()) { |
|
1018 |
child = v.getView(childIndex); |
|
1019 |
childBounds = v.getChildAllocation(childIndex, alloc); |
|
1020 |
retValue = child.getNextVisualPositionFrom( |
|
1021 |
-1, b, childBounds, direction, biasRet); |
|
1022 |
// If there is a bias change, it is a fake position |
|
1023 |
// and we should skip it. This is usually the result |
|
1024 |
// of two elements side be side flowing the same way. |
|
1025 |
if (retValue == pos && biasRet[0] != b) { |
|
1026 |
return getNextVisualPositionFrom(v, pos, biasRet[0], |
|
1027 |
alloc, direction, |
|
1028 |
biasRet); |
|
1029 |
} |
|
1030 |
} |
|
1031 |
else if (retValue != -1 && biasRet[0] != b && |
|
1032 |
((increment == 1 && child.getEndOffset() == retValue) || |
|
1033 |
(increment == -1 && |
|
1034 |
child.getStartOffset() == retValue)) && |
|
1035 |
childIndex >= 0 && childIndex < v.getViewCount()) { |
|
1036 |
// Reached the end of a view, make sure the next view |
|
1037 |
// is a different direction. |
|
1038 |
child = v.getView(childIndex); |
|
1039 |
childBounds = v.getChildAllocation(childIndex, alloc); |
|
1040 |
Position.Bias originalBias = biasRet[0]; |
|
1041 |
int nextPos = child.getNextVisualPositionFrom( |
|
1042 |
-1, b, childBounds, direction, biasRet); |
|
1043 |
if (biasRet[0] == b) { |
|
1044 |
retValue = nextPos; |
|
1045 |
} |
|
1046 |
else { |
|
1047 |
biasRet[0] = originalBias; |
|
1048 |
} |
|
1049 |
} |
|
1050 |
} |
|
1051 |
return retValue; |
|
1052 |
} |
|
1053 |
} |