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axmol/cocos/2d/CCLabelTextFormatter.cpp

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/****************************************************************************
Copyright (c) 2013 Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies Inc.
http://www.cocos2d-x.org
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
#include "2d/CCLabel.h"
#include <vector>
#include "base/ccUTF8.h"
#include "base/CCDirector.h"
#include "2d/CCFontAtlas.h"
#include "2d/CCFontFNT.h"
NS_CC_BEGIN
void Label::computeAlignmentOffset()
{
_linesOffsetX.clear();
switch (_hAlignment)
{
case cocos2d::TextHAlignment::LEFT:
_linesOffsetX.assign(_numberOfLines, 0);
break;
case cocos2d::TextHAlignment::CENTER:
for (auto lineWidth : _linesWidth)
{
_linesOffsetX.push_back((_contentSize.width - lineWidth) / 2.f);
}
break;
case cocos2d::TextHAlignment::RIGHT:
for (auto lineWidth : _linesWidth)
{
_linesOffsetX.push_back(_contentSize.width - lineWidth);
}
break;
default:
break;
}
switch (_vAlignment)
{
case cocos2d::TextVAlignment::TOP:
_letterOffsetY = _contentSize.height;
break;
case cocos2d::TextVAlignment::CENTER:
_letterOffsetY = (_contentSize.height + _textDesiredHeight) / 2.f;
break;
case cocos2d::TextVAlignment::BOTTOM:
_letterOffsetY = _textDesiredHeight;
break;
default:
break;
}
}
static int getFirstCharLen(const std::u16string& utf16Text, int startIndex, int textLen)
{
return 1;
}
static int getFirstWordLen(const std::u16string& utf16Text, int startIndex, int textLen)
{
auto character = utf16Text[startIndex];
if (StringUtils::isCJKUnicode(character) || StringUtils::isUnicodeSpace(character) || character == '\n')
{
return 1;
}
int len = 1;
for (int index = startIndex + 1; index < textLen; ++index)
{
character = utf16Text[index];
if (character == '\n' || StringUtils::isUnicodeSpace(character) || StringUtils::isCJKUnicode(character))
{
break;
}
len++;
}
return len;
}
void Label::updateBMFontScale()
{
auto font = _fontAtlas->getFont();
if (_currentLabelType == LabelType::BMFONT) {
FontFNT *bmFont = (FontFNT*)font;
float originalFontSize = bmFont->getOriginalFontSize();
_bmfontScale = _bmFontSize * CC_CONTENT_SCALE_FACTOR() / originalFontSize;
}else{
_bmfontScale = 1.0f;
}
}
bool Label::multilineTextWrap(std::function<int(const std::u16string&, int, int)> nextTokenLen)
{
int textLen = getStringLength();
int lineIndex = 0;
float nextTokenX = 0.f;
float nextTokenY = 0.f;
float longestLine = 0.f;
float letterRight = 0.f;
auto contentScaleFactor = CC_CONTENT_SCALE_FACTOR();
float lineSpacing = _lineSpacing * contentScaleFactor;
float highestY = 0.f;
float lowestY = 0.f;
FontLetterDefinition letterDef;
Vec2 letterPosition;
this->updateBMFontScale();
for (int index = 0; index < textLen; )
{
auto character = _utf16Text[index];
if (character == '\n')
{
_linesWidth.push_back(letterRight);
letterRight = 0.f;
lineIndex++;
nextTokenX = 0.f;
nextTokenY -= _lineHeight*_bmfontScale + lineSpacing;
recordPlaceholderInfo(index, character);
index++;
continue;
}
auto tokenLen = nextTokenLen(_utf16Text, index, textLen);
float tokenHighestY = highestY;;
float tokenLowestY = lowestY;
float tokenRight = letterRight;
float nextLetterX = nextTokenX;
bool newLine = false;
for (int tmp = 0; tmp < tokenLen;++tmp)
{
int letterIndex = index + tmp;
character = _utf16Text[letterIndex];
if (character == '\r')
{
recordPlaceholderInfo(letterIndex, character);
continue;
}
if (_fontAtlas->getLetterDefinitionForChar(character, letterDef) == false)
{
recordPlaceholderInfo(letterIndex, character);
CCLOG("LabelTextFormatter error:can't find letter definition in font file for letter: %c", character);
continue;
}
auto letterX = (nextLetterX + letterDef.offsetX * _bmfontScale) / contentScaleFactor;
if (_enableWrap && _maxLineWidth > 0.f && nextTokenX > 0.f && letterX + letterDef.width * _bmfontScale > _maxLineWidth)
{
_linesWidth.push_back(letterRight);
letterRight = 0.f;
lineIndex++;
nextTokenX = 0.f;
nextTokenY -= (_lineHeight*_bmfontScale + lineSpacing);
newLine = true;
break;
}
else
{
letterPosition.x = letterX;
}
letterPosition.y = (nextTokenY - letterDef.offsetY * _bmfontScale) / contentScaleFactor;
recordLetterInfo(letterPosition, character, letterIndex, lineIndex);
if (_horizontalKernings && letterIndex < textLen - 1)
nextLetterX += _horizontalKernings[letterIndex + 1];
nextLetterX += letterDef.xAdvance * _bmfontScale + _additionalKerning;
tokenRight = letterPosition.x + letterDef.width * _bmfontScale;
if (tokenHighestY < letterPosition.y)
tokenHighestY = letterPosition.y;
if (tokenLowestY > letterPosition.y - letterDef.height * _bmfontScale)
tokenLowestY = letterPosition.y - letterDef.height * _bmfontScale;
}
if (newLine)
{
continue;
}
nextTokenX = nextLetterX;
letterRight = tokenRight;
if (highestY < tokenHighestY)
highestY = tokenHighestY;
if (lowestY > tokenLowestY)
lowestY = tokenLowestY;
if (longestLine < letterRight)
longestLine = letterRight;
index += tokenLen;
}
_linesWidth.push_back(letterRight);
_numberOfLines = lineIndex + 1;
_textDesiredHeight = (_numberOfLines * _lineHeight * _bmfontScale) / contentScaleFactor;
if (_numberOfLines > 1)
_textDesiredHeight += (_numberOfLines - 1) * _lineSpacing;
Size contentSize(_labelWidth, _labelHeight);
if (_labelWidth <= 0.f)
contentSize.width = longestLine;
if (_labelHeight <= 0.f)
contentSize.height = _textDesiredHeight;
setContentSize(contentSize);
_tailoredTopY = contentSize.height;
_tailoredBottomY = 0.f;
if (highestY > 0.f)
_tailoredTopY = contentSize.height + highestY;
if (lowestY < -_textDesiredHeight)
_tailoredBottomY = _textDesiredHeight + lowestY;
return true;
}
bool Label::multilineTextWrapByWord()
{
return multilineTextWrap(std::bind(getFirstWordLen, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
}
bool Label::multilineTextWrapByChar()
{
return multilineTextWrap(std::bind(getFirstCharLen, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
}
bool Label::isVerticalClamp()
{
if (_textDesiredHeight > _contentSize.height)
{
return true;
}
else
{
return false;
}
}
bool Label::isHorizontalClamp()
{
bool letterClamp = false;
for (int ctr = 0; ctr < _lengthOfString; ++ctr)
{
if (_lettersInfo[ctr].valid)
{
auto& letterDef = _fontAtlas->_letterDefinitions[_lettersInfo[ctr].utf16Char];
auto px = _lettersInfo[ctr].positionX + letterDef.width/2 * _bmfontScale;
if(_labelWidth > 0.f){
if (px > _contentSize.width) {
letterClamp = true;
break;
}
}
}
}
return letterClamp;
}
void Label::shrinkLabelToContentSize(std::function<bool(void)> lambda)
{
float fontSize = this->getRenderingFontSize();
int i = 0;
auto letterDefinition = _fontAtlas->_letterDefinitions;
auto tempLetterDefinition = letterDefinition;
float originalLineHeight = _lineHeight;
bool flag = true;
while (lambda()) {
++i;
float newFontSize = fontSize - i;
flag = false;
if (newFontSize <= 0) {
break;
}
float scale = newFontSize / fontSize;
std::swap(_fontAtlas->_letterDefinitions, tempLetterDefinition);
_fontAtlas->scaleFontLetterDefinition(scale);
this->setLineHeight(originalLineHeight * scale);
if (_maxLineWidth > 0.f && !_lineBreakWithoutSpaces)
{
multilineTextWrapByWord();
}
else
{
multilineTextWrapByChar();
}
computeAlignmentOffset();
tempLetterDefinition = letterDefinition;
}
this->setLineHeight(originalLineHeight);
std::swap(_fontAtlas->_letterDefinitions, letterDefinition);
if (!flag) {
if (fontSize - i >= 0) {
this->scaleFontSizeDown(fontSize - i);
}
}
}
void Label::recordLetterInfo(const cocos2d::Vec2& point, char16_t utf16Char, int letterIndex, int lineIndex)
{
if (static_cast<std::size_t>(letterIndex) >= _lettersInfo.size())
{
LetterInfo tmpInfo;
_lettersInfo.push_back(tmpInfo);
}
_lettersInfo[letterIndex].lineIndex = lineIndex;
_lettersInfo[letterIndex].utf16Char = utf16Char;
_lettersInfo[letterIndex].valid = _fontAtlas->_letterDefinitions[utf16Char].validDefinition;
_lettersInfo[letterIndex].positionX = point.x;
_lettersInfo[letterIndex].positionY = point.y;
}
void Label::recordPlaceholderInfo(int letterIndex, char16_t utf16Char)
{
if (static_cast<std::size_t>(letterIndex) >= _lettersInfo.size())
{
LetterInfo tmpInfo;
_lettersInfo.push_back(tmpInfo);
}
_lettersInfo[letterIndex].utf16Char = utf16Char;
_lettersInfo[letterIndex].valid = false;
}
NS_CC_END
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