author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 11 May 2010 17:13:44 +0300 | |
branch | RCL_3 |
changeset 70 | 8bfb9186a8b8 |
parent 0 | dd21522fd290 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
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* its contributors may be used to endorse or promote products derived |
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* from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#include "config.h" |
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#include "StringTruncator.h" |
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#include "CharacterNames.h" |
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#include "Font.h" |
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#include "FontPlatformData.h" |
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#include "TextBreakIterator.h" |
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#include "TextStyle.h" |
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#include <wtf/Assertions.h> |
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#include <wtf/Vector.h> |
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namespace WebCore { |
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#define STRING_BUFFER_SIZE 2048 |
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typedef unsigned TruncationFunction(const String&, unsigned length, unsigned keepCount, UChar* buffer); |
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static inline int textBreakAtOrPreceding(TextBreakIterator* it, int offset) |
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{ |
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if (isTextBreak(it, offset)) |
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return offset; |
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int result = textBreakPreceding(it, offset); |
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return result == TextBreakDone ? 0 : result; |
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} |
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static inline int boundedTextBreakFollowing(TextBreakIterator* it, int offset, int length) |
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{ |
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int result = textBreakFollowing(it, offset); |
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return result == TextBreakDone ? length : result; |
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} |
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static unsigned centerTruncateToBuffer(const String& string, unsigned length, unsigned keepCount, UChar* buffer) |
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{ |
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ASSERT(keepCount < length); |
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ASSERT(keepCount < STRING_BUFFER_SIZE); |
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unsigned omitStart = (keepCount + 1) / 2; |
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TextBreakIterator* it = characterBreakIterator(string.characters(), length); |
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unsigned omitEnd = boundedTextBreakFollowing(it, omitStart + (length - keepCount) - 1, length); |
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omitStart = textBreakAtOrPreceding(it, omitStart); |
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unsigned truncatedLength = omitStart + 1 + (length - omitEnd); |
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ASSERT(truncatedLength <= length); |
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memcpy(buffer, string.characters(), sizeof(UChar) * omitStart); |
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buffer[omitStart] = horizontalEllipsis; |
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memcpy(&buffer[omitStart + 1], &string.characters()[omitEnd], sizeof(UChar) * (length - omitEnd)); |
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return truncatedLength; |
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} |
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static unsigned rightTruncateToBuffer(const String& string, unsigned length, unsigned keepCount, UChar* buffer) |
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{ |
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ASSERT(keepCount < length); |
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ASSERT(keepCount < STRING_BUFFER_SIZE); |
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TextBreakIterator* it = characterBreakIterator(string.characters(), length); |
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unsigned keepLength = textBreakAtOrPreceding(it, keepCount); |
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unsigned truncatedLength = keepLength + 1; |
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memcpy(buffer, string.characters(), sizeof(UChar) * keepLength); |
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buffer[keepLength] = horizontalEllipsis; |
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return truncatedLength; |
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} |
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static float stringWidth(const Font& renderer, const UChar* characters, unsigned length, bool disableRoundingHacks) |
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{ |
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TextRun run(characters, length); |
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TextStyle style; |
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if (disableRoundingHacks) |
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style.disableRoundingHacks(); |
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return renderer.floatWidth(run, style); |
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} |
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static String truncateString(const String& string, float maxWidth, const Font& font, TruncationFunction truncateToBuffer, bool disableRoundingHacks) |
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{ |
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if (string.isEmpty()) |
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return string; |
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|
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ASSERT(maxWidth >= 0); |
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111 |
|
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float currentEllipsisWidth = stringWidth(font, &horizontalEllipsis, 1, disableRoundingHacks); |
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|
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UChar stringBuffer[STRING_BUFFER_SIZE]; |
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unsigned truncatedLength; |
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unsigned keepCount; |
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unsigned length = string.length(); |
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|
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if (length > STRING_BUFFER_SIZE) { |
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keepCount = STRING_BUFFER_SIZE - 1; // need 1 character for the ellipsis |
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truncatedLength = centerTruncateToBuffer(string, length, keepCount, stringBuffer); |
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} else { |
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keepCount = length; |
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memcpy(stringBuffer, string.characters(), sizeof(UChar) * length); |
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truncatedLength = length; |
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} |
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|
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float width = stringWidth(font, stringBuffer, truncatedLength, disableRoundingHacks); |
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if (width <= maxWidth) |
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return string; |
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|
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unsigned keepCountForLargestKnownToFit = 0; |
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float widthForLargestKnownToFit = currentEllipsisWidth; |
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|
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unsigned keepCountForSmallestKnownToNotFit = keepCount; |
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float widthForSmallestKnownToNotFit = width; |
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|
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if (currentEllipsisWidth >= maxWidth) { |
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keepCountForLargestKnownToFit = 1; |
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keepCountForSmallestKnownToNotFit = 2; |
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} |
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142 |
|
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while (keepCountForLargestKnownToFit + 1 < keepCountForSmallestKnownToNotFit) { |
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ASSERT(widthForLargestKnownToFit <= maxWidth); |
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ASSERT(widthForSmallestKnownToNotFit > maxWidth); |
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|
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float ratio = (keepCountForSmallestKnownToNotFit - keepCountForLargestKnownToFit) |
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/ (widthForSmallestKnownToNotFit - widthForLargestKnownToFit); |
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keepCount = static_cast<unsigned>(maxWidth * ratio); |
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|
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if (keepCount <= keepCountForLargestKnownToFit) { |
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keepCount = keepCountForLargestKnownToFit + 1; |
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} else if (keepCount >= keepCountForSmallestKnownToNotFit) { |
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keepCount = keepCountForSmallestKnownToNotFit - 1; |
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} |
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|
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ASSERT(keepCount < length); |
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ASSERT(keepCount > 0); |
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ASSERT(keepCount < keepCountForSmallestKnownToNotFit); |
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ASSERT(keepCount > keepCountForLargestKnownToFit); |
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|
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truncatedLength = truncateToBuffer(string, length, keepCount, stringBuffer); |
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163 |
|
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width = stringWidth(font, stringBuffer, truncatedLength, disableRoundingHacks); |
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if (width <= maxWidth) { |
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keepCountForLargestKnownToFit = keepCount; |
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widthForLargestKnownToFit = width; |
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} else { |
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keepCountForSmallestKnownToNotFit = keepCount; |
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widthForSmallestKnownToNotFit = width; |
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} |
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} |
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|
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if (keepCountForLargestKnownToFit == 0) { |
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keepCountForLargestKnownToFit = 1; |
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} |
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177 |
|
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if (keepCount != keepCountForLargestKnownToFit) { |
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keepCount = keepCountForLargestKnownToFit; |
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truncatedLength = truncateToBuffer(string, length, keepCount, stringBuffer); |
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} |
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|
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return String(stringBuffer, truncatedLength); |
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} |
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|
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String StringTruncator::centerTruncate(const String& string, float maxWidth, const Font& font, bool disableRoundingHacks) |
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{ |
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return truncateString(string, maxWidth, font, centerTruncateToBuffer, disableRoundingHacks); |
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} |
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|
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String StringTruncator::rightTruncate(const String& string, float maxWidth, const Font& font, bool disableRoundingHacks) |
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{ |
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return truncateString(string, maxWidth, font, rightTruncateToBuffer, disableRoundingHacks); |
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} |
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|
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float StringTruncator::width(const String& string, const Font& font, bool disableRoundingHacks) |
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{ |
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return stringWidth(font, string.characters(), string.length(), disableRoundingHacks); |
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} |
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|
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} // namespace WebCore |