mirror of
https://github.com/juce-framework/JUCE.git
synced 2026-01-10 23:44:24 +00:00
592 lines
18 KiB
C++
592 lines
18 KiB
C++
/*
|
|
==============================================================================
|
|
|
|
This file is part of the JUCE 7 technical preview.
|
|
Copyright (c) 2022 - Raw Material Software Limited
|
|
|
|
You may use this code under the terms of the GPL v3
|
|
(see www.gnu.org/licenses).
|
|
|
|
For the technical preview this file cannot be licensed commercially.
|
|
|
|
JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
|
|
EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
|
|
DISCLAIMED.
|
|
|
|
==============================================================================
|
|
*/
|
|
|
|
namespace juce
|
|
{
|
|
|
|
static String substring (const String& text, Range<int> range)
|
|
{
|
|
return text.substring (range.getStart(), range.getEnd());
|
|
}
|
|
|
|
TextLayout::Glyph::Glyph (int glyph, Point<float> anch, float w) noexcept
|
|
: glyphCode (glyph), anchor (anch), width (w)
|
|
{
|
|
}
|
|
|
|
//==============================================================================
|
|
TextLayout::Run::Run (Range<int> range, int numGlyphsToPreallocate)
|
|
: stringRange (range)
|
|
{
|
|
glyphs.ensureStorageAllocated (numGlyphsToPreallocate);
|
|
}
|
|
|
|
Range<float> TextLayout::Run::getRunBoundsX() const noexcept
|
|
{
|
|
Range<float> range;
|
|
bool isFirst = true;
|
|
|
|
for (auto& glyph : glyphs)
|
|
{
|
|
Range<float> r (glyph.anchor.x, glyph.anchor.x + glyph.width);
|
|
|
|
if (isFirst)
|
|
{
|
|
isFirst = false;
|
|
range = r;
|
|
}
|
|
else
|
|
{
|
|
range = range.getUnionWith (r);
|
|
}
|
|
}
|
|
|
|
return range;
|
|
}
|
|
|
|
//==============================================================================
|
|
TextLayout::Line::Line (Range<int> range, Point<float> o, float asc, float desc,
|
|
float lead, int numRunsToPreallocate)
|
|
: stringRange (range), lineOrigin (o),
|
|
ascent (asc), descent (desc), leading (lead)
|
|
{
|
|
runs.ensureStorageAllocated (numRunsToPreallocate);
|
|
}
|
|
|
|
TextLayout::Line::Line (const Line& other)
|
|
: stringRange (other.stringRange), lineOrigin (other.lineOrigin),
|
|
ascent (other.ascent), descent (other.descent), leading (other.leading)
|
|
{
|
|
runs.addCopiesOf (other.runs);
|
|
}
|
|
|
|
TextLayout::Line& TextLayout::Line::operator= (const Line& other)
|
|
{
|
|
auto copy = other;
|
|
swap (copy);
|
|
return *this;
|
|
}
|
|
|
|
Range<float> TextLayout::Line::getLineBoundsX() const noexcept
|
|
{
|
|
Range<float> range;
|
|
bool isFirst = true;
|
|
|
|
for (auto* run : runs)
|
|
{
|
|
auto runRange = run->getRunBoundsX();
|
|
|
|
if (isFirst)
|
|
{
|
|
isFirst = false;
|
|
range = runRange;
|
|
}
|
|
else
|
|
{
|
|
range = range.getUnionWith (runRange);
|
|
}
|
|
}
|
|
|
|
return range + lineOrigin.x;
|
|
}
|
|
|
|
Range<float> TextLayout::Line::getLineBoundsY() const noexcept
|
|
{
|
|
return { lineOrigin.y - ascent,
|
|
lineOrigin.y + descent };
|
|
}
|
|
|
|
Rectangle<float> TextLayout::Line::getLineBounds() const noexcept
|
|
{
|
|
auto x = getLineBoundsX();
|
|
auto y = getLineBoundsY();
|
|
|
|
return { x.getStart(), y.getStart(), x.getLength(), y.getLength() };
|
|
}
|
|
|
|
void TextLayout::Line::swap (Line& other) noexcept
|
|
{
|
|
std::swap (other.runs, runs);
|
|
std::swap (other.stringRange, stringRange);
|
|
std::swap (other.lineOrigin, lineOrigin);
|
|
std::swap (other.ascent, ascent);
|
|
std::swap (other.descent, descent);
|
|
std::swap (other.leading, leading);
|
|
}
|
|
|
|
//==============================================================================
|
|
TextLayout::TextLayout()
|
|
: width (0), height (0), justification (Justification::topLeft)
|
|
{
|
|
}
|
|
|
|
TextLayout::TextLayout (const TextLayout& other)
|
|
: width (other.width), height (other.height),
|
|
justification (other.justification)
|
|
{
|
|
lines.addCopiesOf (other.lines);
|
|
}
|
|
|
|
TextLayout::TextLayout (TextLayout&& other) noexcept
|
|
: lines (std::move (other.lines)),
|
|
width (other.width), height (other.height),
|
|
justification (other.justification)
|
|
{
|
|
}
|
|
|
|
TextLayout& TextLayout::operator= (TextLayout&& other) noexcept
|
|
{
|
|
lines = std::move (other.lines);
|
|
width = other.width;
|
|
height = other.height;
|
|
justification = other.justification;
|
|
return *this;
|
|
}
|
|
|
|
TextLayout& TextLayout::operator= (const TextLayout& other)
|
|
{
|
|
width = other.width;
|
|
height = other.height;
|
|
justification = other.justification;
|
|
lines.clear();
|
|
lines.addCopiesOf (other.lines);
|
|
return *this;
|
|
}
|
|
|
|
TextLayout::~TextLayout()
|
|
{
|
|
}
|
|
|
|
TextLayout::Line& TextLayout::getLine (int index) const noexcept
|
|
{
|
|
return *lines.getUnchecked (index);
|
|
}
|
|
|
|
void TextLayout::ensureStorageAllocated (int numLinesNeeded)
|
|
{
|
|
lines.ensureStorageAllocated (numLinesNeeded);
|
|
}
|
|
|
|
void TextLayout::addLine (std::unique_ptr<Line> line)
|
|
{
|
|
lines.add (line.release());
|
|
}
|
|
|
|
void TextLayout::draw (Graphics& g, Rectangle<float> area) const
|
|
{
|
|
auto origin = justification.appliedToRectangle (Rectangle<float> (width, getHeight()), area).getPosition();
|
|
|
|
auto& context = g.getInternalContext();
|
|
context.saveState();
|
|
|
|
auto clip = context.getClipBounds();
|
|
auto clipTop = (float) clip.getY() - origin.y;
|
|
auto clipBottom = (float) clip.getBottom() - origin.y;
|
|
|
|
for (auto& line : *this)
|
|
{
|
|
auto lineRangeY = line.getLineBoundsY();
|
|
|
|
if (lineRangeY.getEnd() < clipTop)
|
|
continue;
|
|
|
|
if (lineRangeY.getStart() > clipBottom)
|
|
break;
|
|
|
|
auto lineOrigin = origin + line.lineOrigin;
|
|
|
|
for (auto* run : line.runs)
|
|
{
|
|
context.setFont (run->font);
|
|
context.setFill (run->colour);
|
|
|
|
for (auto& glyph : run->glyphs)
|
|
context.drawGlyph (glyph.glyphCode, AffineTransform::translation (lineOrigin.x + glyph.anchor.x,
|
|
lineOrigin.y + glyph.anchor.y));
|
|
|
|
if (run->font.isUnderlined())
|
|
{
|
|
auto runExtent = run->getRunBoundsX();
|
|
auto lineThickness = run->font.getDescent() * 0.3f;
|
|
|
|
context.fillRect ({ runExtent.getStart() + lineOrigin.x, lineOrigin.y + lineThickness * 2.0f,
|
|
runExtent.getLength(), lineThickness });
|
|
}
|
|
}
|
|
}
|
|
|
|
context.restoreState();
|
|
}
|
|
|
|
void TextLayout::createLayout (const AttributedString& text, float maxWidth)
|
|
{
|
|
createLayout (text, maxWidth, 1.0e7f);
|
|
}
|
|
|
|
void TextLayout::createLayout (const AttributedString& text, float maxWidth, float maxHeight)
|
|
{
|
|
lines.clear();
|
|
width = maxWidth;
|
|
height = maxHeight;
|
|
justification = text.getJustification();
|
|
|
|
if (! createNativeLayout (text))
|
|
createStandardLayout (text);
|
|
|
|
recalculateSize();
|
|
}
|
|
|
|
void TextLayout::createLayoutWithBalancedLineLengths (const AttributedString& text, float maxWidth)
|
|
{
|
|
createLayoutWithBalancedLineLengths (text, maxWidth, 1.0e7f);
|
|
}
|
|
|
|
void TextLayout::createLayoutWithBalancedLineLengths (const AttributedString& text, float maxWidth, float maxHeight)
|
|
{
|
|
auto minimumWidth = maxWidth / 2.0f;
|
|
auto bestWidth = maxWidth;
|
|
float bestLineProportion = 0.0f;
|
|
|
|
while (maxWidth > minimumWidth)
|
|
{
|
|
createLayout (text, maxWidth, maxHeight);
|
|
|
|
if (getNumLines() < 2)
|
|
return;
|
|
|
|
auto line1 = lines.getUnchecked (lines.size() - 1)->getLineBoundsX().getLength();
|
|
auto line2 = lines.getUnchecked (lines.size() - 2)->getLineBoundsX().getLength();
|
|
auto shortest = jmin (line1, line2);
|
|
auto longest = jmax (line1, line2);
|
|
auto prop = shortest > 0 ? longest / shortest : 1.0f;
|
|
|
|
if (prop > 0.9f && prop < 1.1f)
|
|
return;
|
|
|
|
if (prop > bestLineProportion)
|
|
{
|
|
bestLineProportion = prop;
|
|
bestWidth = maxWidth;
|
|
}
|
|
|
|
maxWidth -= 10.0f;
|
|
}
|
|
|
|
if (bestWidth != maxWidth)
|
|
createLayout (text, bestWidth, maxHeight);
|
|
}
|
|
|
|
//==============================================================================
|
|
namespace TextLayoutHelpers
|
|
{
|
|
struct Token
|
|
{
|
|
Token (const String& t, const Font& f, Colour c, bool whitespace)
|
|
: text (t), font (f), colour (c),
|
|
area (font.getStringWidthFloat (t), f.getHeight()),
|
|
isWhitespace (whitespace),
|
|
isNewLine (t.containsChar ('\n') || t.containsChar ('\r'))
|
|
{}
|
|
|
|
const String text;
|
|
const Font font;
|
|
const Colour colour;
|
|
Rectangle<float> area;
|
|
int line;
|
|
float lineHeight;
|
|
const bool isWhitespace, isNewLine;
|
|
|
|
Token& operator= (const Token&) = delete;
|
|
};
|
|
|
|
struct TokenList
|
|
{
|
|
TokenList() noexcept {}
|
|
|
|
void createLayout (const AttributedString& text, TextLayout& layout)
|
|
{
|
|
layout.ensureStorageAllocated (totalLines);
|
|
|
|
addTextRuns (text);
|
|
layoutRuns (layout.getWidth(), text.getLineSpacing(), text.getWordWrap());
|
|
|
|
int charPosition = 0;
|
|
int lineStartPosition = 0;
|
|
int runStartPosition = 0;
|
|
|
|
std::unique_ptr<TextLayout::Line> currentLine;
|
|
std::unique_ptr<TextLayout::Run> currentRun;
|
|
|
|
bool needToSetLineOrigin = true;
|
|
|
|
for (int i = 0; i < tokens.size(); ++i)
|
|
{
|
|
auto& t = *tokens.getUnchecked (i);
|
|
|
|
Array<int> newGlyphs;
|
|
Array<float> xOffsets;
|
|
t.font.getGlyphPositions (getTrimmedEndIfNotAllWhitespace (t.text), newGlyphs, xOffsets);
|
|
|
|
if (currentRun == nullptr) currentRun = std::make_unique<TextLayout::Run>();
|
|
if (currentLine == nullptr) currentLine = std::make_unique<TextLayout::Line>();
|
|
|
|
const auto numGlyphs = newGlyphs.size();
|
|
charPosition += numGlyphs;
|
|
|
|
if (numGlyphs > 0
|
|
&& (! (t.isWhitespace || t.isNewLine) || needToSetLineOrigin))
|
|
{
|
|
currentRun->glyphs.ensureStorageAllocated (currentRun->glyphs.size() + newGlyphs.size());
|
|
auto tokenOrigin = t.area.getPosition().translated (0, t.font.getAscent());
|
|
|
|
if (needToSetLineOrigin)
|
|
{
|
|
needToSetLineOrigin = false;
|
|
currentLine->lineOrigin = tokenOrigin;
|
|
}
|
|
|
|
auto glyphOffset = tokenOrigin - currentLine->lineOrigin;
|
|
|
|
for (int j = 0; j < newGlyphs.size(); ++j)
|
|
{
|
|
auto x = xOffsets.getUnchecked (j);
|
|
currentRun->glyphs.add (TextLayout::Glyph (newGlyphs.getUnchecked (j),
|
|
glyphOffset.translated (x, 0),
|
|
xOffsets.getUnchecked (j + 1) - x));
|
|
}
|
|
}
|
|
|
|
if (auto* nextToken = tokens[i + 1])
|
|
{
|
|
if (t.font != nextToken->font || t.colour != nextToken->colour)
|
|
{
|
|
addRun (*currentLine, currentRun.release(), t, runStartPosition, charPosition);
|
|
runStartPosition = charPosition;
|
|
}
|
|
|
|
if (t.line != nextToken->line)
|
|
{
|
|
if (currentRun == nullptr)
|
|
currentRun = std::make_unique<TextLayout::Run>();
|
|
|
|
addRun (*currentLine, currentRun.release(), t, runStartPosition, charPosition);
|
|
currentLine->stringRange = { lineStartPosition, charPosition };
|
|
|
|
if (! needToSetLineOrigin)
|
|
layout.addLine (std::move (currentLine));
|
|
|
|
runStartPosition = charPosition;
|
|
lineStartPosition = charPosition;
|
|
needToSetLineOrigin = true;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
addRun (*currentLine, currentRun.release(), t, runStartPosition, charPosition);
|
|
currentLine->stringRange = { lineStartPosition, charPosition };
|
|
|
|
if (! needToSetLineOrigin)
|
|
layout.addLine (std::move (currentLine));
|
|
|
|
needToSetLineOrigin = true;
|
|
}
|
|
}
|
|
|
|
if ((text.getJustification().getFlags() & (Justification::right | Justification::horizontallyCentred)) != 0)
|
|
{
|
|
auto totalW = layout.getWidth();
|
|
bool isCentred = (text.getJustification().getFlags() & Justification::horizontallyCentred) != 0;
|
|
|
|
for (auto& line : layout)
|
|
{
|
|
auto dx = totalW - line.getLineBoundsX().getLength();
|
|
|
|
if (isCentred)
|
|
dx /= 2.0f;
|
|
|
|
line.lineOrigin.x += dx;
|
|
}
|
|
}
|
|
}
|
|
|
|
private:
|
|
static void addRun (TextLayout::Line& glyphLine, TextLayout::Run* glyphRun,
|
|
const Token& t, int start, int end)
|
|
{
|
|
glyphRun->stringRange = { start, end };
|
|
glyphRun->font = t.font;
|
|
glyphRun->colour = t.colour;
|
|
glyphLine.ascent = jmax (glyphLine.ascent, t.font.getAscent());
|
|
glyphLine.descent = jmax (glyphLine.descent, t.font.getDescent());
|
|
glyphLine.runs.add (glyphRun);
|
|
}
|
|
|
|
static int getCharacterType (juce_wchar c) noexcept
|
|
{
|
|
if (c == '\r' || c == '\n')
|
|
return 0;
|
|
|
|
return CharacterFunctions::isWhitespace (c) ? 2 : 1;
|
|
}
|
|
|
|
void appendText (const String& stringText, const Font& font, Colour colour)
|
|
{
|
|
auto t = stringText.getCharPointer();
|
|
String currentString;
|
|
int lastCharType = 0;
|
|
|
|
for (;;)
|
|
{
|
|
auto c = t.getAndAdvance();
|
|
|
|
if (c == 0)
|
|
break;
|
|
|
|
auto charType = getCharacterType (c);
|
|
|
|
if (charType == 0 || charType != lastCharType)
|
|
{
|
|
if (currentString.isNotEmpty())
|
|
tokens.add (new Token (currentString, font, colour,
|
|
lastCharType == 2 || lastCharType == 0));
|
|
|
|
currentString = String::charToString (c);
|
|
|
|
if (c == '\r' && *t == '\n')
|
|
currentString += t.getAndAdvance();
|
|
}
|
|
else
|
|
{
|
|
currentString += c;
|
|
}
|
|
|
|
lastCharType = charType;
|
|
}
|
|
|
|
if (currentString.isNotEmpty())
|
|
tokens.add (new Token (currentString, font, colour, lastCharType == 2));
|
|
}
|
|
|
|
void layoutRuns (float maxWidth, float extraLineSpacing, AttributedString::WordWrap wordWrap)
|
|
{
|
|
float x = 0, y = 0, h = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < tokens.size(); ++i)
|
|
{
|
|
auto& t = *tokens.getUnchecked (i);
|
|
t.area.setPosition (x, y);
|
|
t.line = totalLines;
|
|
x += t.area.getWidth();
|
|
h = jmax (h, t.area.getHeight() + extraLineSpacing);
|
|
|
|
auto* nextTok = tokens[i + 1];
|
|
|
|
if (nextTok == nullptr)
|
|
break;
|
|
|
|
bool tokenTooLarge = (x + nextTok->area.getWidth() > maxWidth);
|
|
|
|
if (t.isNewLine || ((! nextTok->isWhitespace) && (tokenTooLarge && wordWrap != AttributedString::none)))
|
|
{
|
|
setLastLineHeight (i + 1, h);
|
|
x = 0;
|
|
y += h;
|
|
h = 0;
|
|
++totalLines;
|
|
}
|
|
}
|
|
|
|
setLastLineHeight (jmin (i + 1, tokens.size()), h);
|
|
++totalLines;
|
|
}
|
|
|
|
void setLastLineHeight (int i, float height) noexcept
|
|
{
|
|
while (--i >= 0)
|
|
{
|
|
auto& tok = *tokens.getUnchecked (i);
|
|
|
|
if (tok.line == totalLines)
|
|
tok.lineHeight = height;
|
|
else
|
|
break;
|
|
}
|
|
}
|
|
|
|
void addTextRuns (const AttributedString& text)
|
|
{
|
|
auto numAttributes = text.getNumAttributes();
|
|
tokens.ensureStorageAllocated (jmax (64, numAttributes));
|
|
|
|
for (int i = 0; i < numAttributes; ++i)
|
|
{
|
|
auto& attr = text.getAttribute (i);
|
|
|
|
appendText (substring (text.getText(), attr.range),
|
|
attr.font, attr.colour);
|
|
}
|
|
}
|
|
|
|
static String getTrimmedEndIfNotAllWhitespace (const String& s)
|
|
{
|
|
auto trimmed = s.trimEnd();
|
|
|
|
if (trimmed.isEmpty() && s.isNotEmpty())
|
|
trimmed = s.replaceCharacters ("\r\n\t", " ");
|
|
|
|
return trimmed;
|
|
}
|
|
|
|
OwnedArray<Token> tokens;
|
|
int totalLines = 0;
|
|
|
|
JUCE_DECLARE_NON_COPYABLE (TokenList)
|
|
};
|
|
}
|
|
|
|
//==============================================================================
|
|
void TextLayout::createStandardLayout (const AttributedString& text)
|
|
{
|
|
TextLayoutHelpers::TokenList l;
|
|
l.createLayout (text, *this);
|
|
}
|
|
|
|
void TextLayout::recalculateSize()
|
|
{
|
|
if (! lines.isEmpty())
|
|
{
|
|
auto bounds = lines.getFirst()->getLineBounds();
|
|
|
|
for (auto* line : lines)
|
|
bounds = bounds.getUnion (line->getLineBounds());
|
|
|
|
for (auto* line : lines)
|
|
line->lineOrigin.x -= bounds.getX();
|
|
|
|
width = bounds.getWidth();
|
|
height = bounds.getHeight();
|
|
}
|
|
else
|
|
{
|
|
width = 0;
|
|
height = 0;
|
|
}
|
|
}
|
|
|
|
} // namespace juce
|