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https://github.com/juce-framework/JUCE.git
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383 lines
10 KiB
C++
383 lines
10 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-9 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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#include "../../../core/juce_StandardHeader.h"
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BEGIN_JUCE_NAMESPACE
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#include "juce_TextLayout.h"
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#include "../contexts/juce_Graphics.h"
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//==============================================================================
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class TextLayout::Token
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{
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public:
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String text;
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Font font;
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int x, y, w, h;
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int line, lineHeight;
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bool isWhitespace, isNewLine;
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Token (const String& t,
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const Font& f,
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const bool isWhitespace_) throw()
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: text (t),
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font (f),
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x(0),
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y(0),
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isWhitespace (isWhitespace_)
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{
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w = font.getStringWidth (t);
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h = roundToInt (f.getHeight());
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isNewLine = t.containsAnyOf (T("\r\n"));
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}
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Token (const Token& other) throw()
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: text (other.text),
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font (other.font),
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x (other.x),
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y (other.y),
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w (other.w),
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h (other.h),
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line (other.line),
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lineHeight (other.lineHeight),
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isWhitespace (other.isWhitespace),
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isNewLine (other.isNewLine)
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{
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}
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~Token() throw()
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{
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}
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void draw (Graphics& g,
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const int xOffset,
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const int yOffset) throw()
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{
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if (! isWhitespace)
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{
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g.setFont (font);
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g.drawSingleLineText (text.trimEnd(),
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xOffset + x,
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yOffset + y + (lineHeight - h)
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+ roundToInt (font.getAscent()));
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}
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}
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juce_UseDebuggingNewOperator
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};
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//==============================================================================
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TextLayout::TextLayout() throw()
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: totalLines (0)
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{
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tokens.ensureStorageAllocated (64);
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}
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TextLayout::TextLayout (const String& text,
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const Font& font) throw()
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: totalLines (0)
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{
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tokens.ensureStorageAllocated (64);
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appendText (text, font);
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}
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TextLayout::TextLayout (const TextLayout& other) throw()
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: totalLines (0)
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{
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*this = other;
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}
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TextLayout& TextLayout::operator= (const TextLayout& other) throw()
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{
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if (this != &other)
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{
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clear();
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totalLines = other.totalLines;
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for (int i = 0; i < other.tokens.size(); ++i)
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tokens.add (new Token (*other.tokens.getUnchecked(i)));
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}
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return *this;
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}
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TextLayout::~TextLayout() throw()
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{
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clear();
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}
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//==============================================================================
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void TextLayout::clear() throw()
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{
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tokens.clear();
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totalLines = 0;
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}
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void TextLayout::appendText (const String& text,
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const Font& font) throw()
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{
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const tchar* t = text;
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String currentString;
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int lastCharType = 0;
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for (;;)
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{
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const tchar c = *t++;
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if (c == 0)
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break;
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int charType;
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if (c == '\r' || c == '\n')
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{
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charType = 0;
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}
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else if (CharacterFunctions::isWhitespace (c))
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{
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charType = 2;
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}
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else
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{
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charType = 1;
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}
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if (charType == 0 || charType != lastCharType)
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{
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if (currentString.isNotEmpty())
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{
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tokens.add (new Token (currentString, font,
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lastCharType == 2 || lastCharType == 0));
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}
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currentString = String::charToString (c);
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if (c == '\r' && *t == '\n')
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currentString += *t++;
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}
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else
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{
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currentString += c;
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}
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lastCharType = charType;
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}
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if (currentString.isNotEmpty())
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tokens.add (new Token (currentString, font, lastCharType == 2));
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}
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void TextLayout::setText (const String& text, const Font& font) throw()
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{
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clear();
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appendText (text, font);
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}
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//==============================================================================
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void TextLayout::layout (int maxWidth,
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const Justification& justification,
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const bool attemptToBalanceLineLengths) throw()
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{
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if (attemptToBalanceLineLengths)
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{
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const int originalW = maxWidth;
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int bestWidth = maxWidth;
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float bestLineProportion = 0.0f;
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while (maxWidth > originalW / 2)
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{
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layout (maxWidth, justification, false);
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if (getNumLines() <= 1)
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return;
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const int lastLineW = getLineWidth (getNumLines() - 1);
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const int lastButOneLineW = getLineWidth (getNumLines() - 2);
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const float prop = lastLineW / (float) lastButOneLineW;
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if (prop > 0.9f)
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return;
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if (prop > bestLineProportion)
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{
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bestLineProportion = prop;
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bestWidth = maxWidth;
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}
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maxWidth -= 10;
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}
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layout (bestWidth, justification, false);
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}
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else
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{
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int x = 0;
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int y = 0;
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int h = 0;
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totalLines = 0;
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int i;
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for (i = 0; i < tokens.size(); ++i)
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{
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Token* const t = tokens.getUnchecked(i);
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t->x = x;
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t->y = y;
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t->line = totalLines;
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x += t->w;
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h = jmax (h, t->h);
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const Token* nextTok = tokens [i + 1];
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if (nextTok == 0)
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break;
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if (t->isNewLine || ((! nextTok->isWhitespace) && x + nextTok->w > maxWidth))
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{
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// finished a line, so go back and update the heights of the things on it
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for (int j = i; j >= 0; --j)
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{
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Token* const tok = tokens.getUnchecked(j);
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if (tok->line == totalLines)
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tok->lineHeight = h;
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else
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break;
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}
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x = 0;
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y += h;
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h = 0;
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++totalLines;
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}
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}
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// finished a line, so go back and update the heights of the things on it
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for (int j = jmin (i, tokens.size() - 1); j >= 0; --j)
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{
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Token* const t = tokens.getUnchecked(j);
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if (t->line == totalLines)
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t->lineHeight = h;
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else
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break;
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}
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++totalLines;
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if (! justification.testFlags (Justification::left))
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{
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int totalW = getWidth();
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for (i = totalLines; --i >= 0;)
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{
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const int lineW = getLineWidth (i);
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int dx = 0;
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if (justification.testFlags (Justification::horizontallyCentred))
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dx = (totalW - lineW) / 2;
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else if (justification.testFlags (Justification::right))
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dx = totalW - lineW;
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for (int j = tokens.size(); --j >= 0;)
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{
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Token* const t = tokens.getUnchecked(j);
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if (t->line == i)
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t->x += dx;
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}
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}
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}
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}
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}
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//==============================================================================
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int TextLayout::getLineWidth (const int lineNumber) const throw()
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{
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int maxW = 0;
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for (int i = tokens.size(); --i >= 0;)
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{
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const Token* const t = tokens.getUnchecked(i);
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if (t->line == lineNumber && ! t->isWhitespace)
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maxW = jmax (maxW, t->x + t->w);
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}
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return maxW;
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}
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int TextLayout::getWidth() const throw()
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{
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int maxW = 0;
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for (int i = tokens.size(); --i >= 0;)
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{
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const Token* const t = tokens.getUnchecked(i);
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if (! t->isWhitespace)
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maxW = jmax (maxW, t->x + t->w);
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}
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return maxW;
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}
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int TextLayout::getHeight() const throw()
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{
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int maxH = 0;
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for (int i = tokens.size(); --i >= 0;)
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{
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const Token* const t = tokens.getUnchecked(i);
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if (! t->isWhitespace)
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maxH = jmax (maxH, t->y + t->h);
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}
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return maxH;
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}
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//==============================================================================
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void TextLayout::draw (Graphics& g,
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const int xOffset,
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const int yOffset) const throw()
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{
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for (int i = tokens.size(); --i >= 0;)
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tokens.getUnchecked(i)->draw (g, xOffset, yOffset);
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}
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void TextLayout::drawWithin (Graphics& g,
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int x, int y, int w, int h,
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const Justification& justification) const throw()
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{
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justification.applyToRectangle (x, y, getWidth(), getHeight(),
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x, y, w, h);
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draw (g, x, y);
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}
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END_JUCE_NAMESPACE
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