| /* |
| * Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * (C) Copyright Taligent, Inc. 1996 - 1997, All Rights Reserved |
| * (C) Copyright IBM Corp. 1996 - 1998, All Rights Reserved |
| * |
| * The original version of this source code and documentation is |
| * copyrighted and owned by Taligent, Inc., a wholly-owned subsidiary |
| * of IBM. These materials are provided under terms of a License |
| * Agreement between Taligent and Sun. This technology is protected |
| * by multiple US and International patents. |
| * |
| * This notice and attribution to Taligent may not be removed. |
| * Taligent is a registered trademark of Taligent, Inc. |
| * |
| */ |
| |
| package java.awt.font; |
| import java.lang.String; |
| |
| /** |
| * The <code>TextHitInfo</code> class represents a character position in a |
| * text model, and a <b>bias</b>, or "side," of the character. Biases are |
| * either <EM>leading</EM> (the left edge, for a left-to-right character) |
| * or <EM>trailing</EM> (the right edge, for a left-to-right character). |
| * Instances of <code>TextHitInfo</code> are used to specify caret and |
| * insertion positions within text. |
| * <p> |
| * For example, consider the text "abc". TextHitInfo.trailing(1) |
| * corresponds to the right side of the 'b' in the text. |
| * <p> |
| * <code>TextHitInfo</code> is used primarily by {@link TextLayout} and |
| * clients of <code>TextLayout</code>. Clients of <code>TextLayout</code> |
| * query <code>TextHitInfo</code> instances for an insertion offset, where |
| * new text is inserted into the text model. The insertion offset is equal |
| * to the character position in the <code>TextHitInfo</code> if the bias |
| * is leading, and one character after if the bias is trailing. The |
| * insertion offset for TextHitInfo.trailing(1) is 2. |
| * <p> |
| * Sometimes it is convenient to construct a <code>TextHitInfo</code> with |
| * the same insertion offset as an existing one, but on the opposite |
| * character. The <code>getOtherHit</code> method constructs a new |
| * <code>TextHitInfo</code> with the same insertion offset as an existing |
| * one, with a hit on the character on the other side of the insertion offset. |
| * Calling <code>getOtherHit</code> on trailing(1) would return leading(2). |
| * In general, <code>getOtherHit</code> for trailing(n) returns |
| * leading(n+1) and <code>getOtherHit</code> for leading(n) |
| * returns trailing(n-1). |
| * <p> |
| * <strong>Example</strong>:<p> |
| * Converting a graphical point to an insertion point within a text |
| * model |
| * <blockquote><pre> |
| * TextLayout layout = ...; |
| * Point2D.Float hitPoint = ...; |
| * TextHitInfo hitInfo = layout.hitTestChar(hitPoint.x, hitPoint.y); |
| * int insPoint = hitInfo.getInsertionIndex(); |
| * // insPoint is relative to layout; may need to adjust for use |
| * // in a text model |
| * </pre></blockquote> |
| * |
| * @see TextLayout |
| */ |
| |
| public final class TextHitInfo { |
| private int charIndex; |
| private boolean isLeadingEdge; |
| |
| /** |
| * Constructs a new <code>TextHitInfo</code>. |
| * @param charIndex the index of the character hit |
| * @param isLeadingEdge <code>true</code> if the leading edge of the |
| * character was hit |
| */ |
| private TextHitInfo(int charIndex, boolean isLeadingEdge) { |
| this.charIndex = charIndex; |
| this.isLeadingEdge = isLeadingEdge; |
| } |
| |
| /** |
| * Returns the index of the character hit. |
| * @return the index of the character hit. |
| */ |
| public int getCharIndex() { |
| return charIndex; |
| } |
| |
| /** |
| * Returns <code>true</code> if the leading edge of the character was |
| * hit. |
| * @return <code>true</code> if the leading edge of the character was |
| * hit; <code>false</code> otherwise. |
| */ |
| public boolean isLeadingEdge() { |
| return isLeadingEdge; |
| } |
| |
| /** |
| * Returns the insertion index. This is the character index if |
| * the leading edge of the character was hit, and one greater |
| * than the character index if the trailing edge was hit. |
| * @return the insertion index. |
| */ |
| public int getInsertionIndex() { |
| return isLeadingEdge ? charIndex : charIndex + 1; |
| } |
| |
| /** |
| * Returns the hash code. |
| * @return the hash code of this <code>TextHitInfo</code>, which is |
| * also the <code>charIndex</code> of this <code>TextHitInfo</code>. |
| */ |
| public int hashCode() { |
| return charIndex; |
| } |
| |
| /** |
| * Returns <code>true</code> if the specified <code>Object</code> is a |
| * <code>TextHitInfo</code> and equals this <code>TextHitInfo</code>. |
| * @param obj the <code>Object</code> to test for equality |
| * @return <code>true</code> if the specified <code>Object</code> |
| * equals this <code>TextHitInfo</code>; <code>false</code> otherwise. |
| */ |
| public boolean equals(Object obj) { |
| return (obj instanceof TextHitInfo) && equals((TextHitInfo)obj); |
| } |
| |
| /** |
| * Returns <code>true</code> if the specified <code>TextHitInfo</code> |
| * has the same <code>charIndex</code> and <code>isLeadingEdge</code> |
| * as this <code>TextHitInfo</code>. This is not the same as having |
| * the same insertion offset. |
| * @param hitInfo a specified <code>TextHitInfo</code> |
| * @return <code>true</code> if the specified <code>TextHitInfo</code> |
| * has the same <code>charIndex</code> and <code>isLeadingEdge</code> |
| * as this <code>TextHitInfo</code>. |
| */ |
| public boolean equals(TextHitInfo hitInfo) { |
| return hitInfo != null && charIndex == hitInfo.charIndex && |
| isLeadingEdge == hitInfo.isLeadingEdge; |
| } |
| |
| /** |
| * Returns a <code>String</code> representing the hit for debugging |
| * use only. |
| * @return a <code>String</code> representing this |
| * <code>TextHitInfo</code>. |
| */ |
| public String toString() { |
| return "TextHitInfo[" + charIndex + (isLeadingEdge ? "L" : "T")+"]"; |
| } |
| |
| /** |
| * Creates a <code>TextHitInfo</code> on the leading edge of the |
| * character at the specified <code>charIndex</code>. |
| * @param charIndex the index of the character hit |
| * @return a <code>TextHitInfo</code> on the leading edge of the |
| * character at the specified <code>charIndex</code>. |
| */ |
| public static TextHitInfo leading(int charIndex) { |
| return new TextHitInfo(charIndex, true); |
| } |
| |
| /** |
| * Creates a hit on the trailing edge of the character at |
| * the specified <code>charIndex</code>. |
| * @param charIndex the index of the character hit |
| * @return a <code>TextHitInfo</code> on the trailing edge of the |
| * character at the specified <code>charIndex</code>. |
| */ |
| public static TextHitInfo trailing(int charIndex) { |
| return new TextHitInfo(charIndex, false); |
| } |
| |
| /** |
| * Creates a <code>TextHitInfo</code> at the specified offset, |
| * associated with the character before the offset. |
| * @param offset an offset associated with the character before |
| * the offset |
| * @return a <code>TextHitInfo</code> at the specified offset. |
| */ |
| public static TextHitInfo beforeOffset(int offset) { |
| return new TextHitInfo(offset-1, false); |
| } |
| |
| /** |
| * Creates a <code>TextHitInfo</code> at the specified offset, |
| * associated with the character after the offset. |
| * @param offset an offset associated with the character after |
| * the offset |
| * @return a <code>TextHitInfo</code> at the specified offset. |
| */ |
| public static TextHitInfo afterOffset(int offset) { |
| return new TextHitInfo(offset, true); |
| } |
| |
| /** |
| * Creates a <code>TextHitInfo</code> on the other side of the |
| * insertion point. This <code>TextHitInfo</code> remains unchanged. |
| * @return a <code>TextHitInfo</code> on the other side of the |
| * insertion point. |
| */ |
| public TextHitInfo getOtherHit() { |
| if (isLeadingEdge) { |
| return trailing(charIndex - 1); |
| } else { |
| return leading(charIndex + 1); |
| } |
| } |
| |
| /** |
| * Creates a <code>TextHitInfo</code> whose character index is offset |
| * by <code>delta</code> from the <code>charIndex</code> of this |
| * <code>TextHitInfo</code>. This <code>TextHitInfo</code> remains |
| * unchanged. |
| * @param delta the value to offset this <code>charIndex</code> |
| * @return a <code>TextHitInfo</code> whose <code>charIndex</code> is |
| * offset by <code>delta</code> from the <code>charIndex</code> of |
| * this <code>TextHitInfo</code>. |
| */ |
| public TextHitInfo getOffsetHit(int delta) { |
| return new TextHitInfo(charIndex + delta, isLeadingEdge); |
| } |
| } |