600 lines
18 KiB
C++
600 lines
18 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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static String substring (const String& text, Range<int> range)
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{
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return text.substring (range.getStart(), range.getEnd());
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}
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TextLayout::Glyph::Glyph (int glyph, Point<float> anch, float w) noexcept
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: glyphCode (glyph), anchor (anch), width (w)
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{
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}
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//==============================================================================
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TextLayout::Run::Run (Range<int> range, int numGlyphsToPreallocate)
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: stringRange (range)
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{
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glyphs.ensureStorageAllocated (numGlyphsToPreallocate);
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}
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Range<float> TextLayout::Run::getRunBoundsX() const noexcept
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{
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Range<float> range;
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bool isFirst = true;
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for (auto& glyph : glyphs)
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{
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Range<float> r (glyph.anchor.x, glyph.anchor.x + glyph.width);
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if (isFirst)
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{
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isFirst = false;
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range = r;
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}
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else
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{
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range = range.getUnionWith (r);
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}
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}
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return range;
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}
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//==============================================================================
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TextLayout::Line::Line (Range<int> range, Point<float> o, float asc, float desc,
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float lead, int numRunsToPreallocate)
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: stringRange (range), lineOrigin (o),
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ascent (asc), descent (desc), leading (lead)
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{
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runs.ensureStorageAllocated (numRunsToPreallocate);
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}
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TextLayout::Line::Line (const Line& other)
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: stringRange (other.stringRange), lineOrigin (other.lineOrigin),
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ascent (other.ascent), descent (other.descent), leading (other.leading)
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{
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runs.addCopiesOf (other.runs);
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}
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TextLayout::Line& TextLayout::Line::operator= (const Line& other)
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{
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auto copy = other;
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swap (copy);
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return *this;
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}
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Range<float> TextLayout::Line::getLineBoundsX() const noexcept
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{
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Range<float> range;
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bool isFirst = true;
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for (auto* run : runs)
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{
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auto runRange = run->getRunBoundsX();
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if (isFirst)
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{
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isFirst = false;
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range = runRange;
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}
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else
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{
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range = range.getUnionWith (runRange);
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}
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}
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return range + lineOrigin.x;
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}
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Range<float> TextLayout::Line::getLineBoundsY() const noexcept
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{
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return { lineOrigin.y - ascent,
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lineOrigin.y + descent };
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}
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Rectangle<float> TextLayout::Line::getLineBounds() const noexcept
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{
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auto x = getLineBoundsX();
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auto y = getLineBoundsY();
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return { x.getStart(), y.getStart(), x.getLength(), y.getLength() };
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}
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void TextLayout::Line::swap (Line& other) noexcept
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{
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std::swap (other.runs, runs);
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std::swap (other.stringRange, stringRange);
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std::swap (other.lineOrigin, lineOrigin);
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std::swap (other.ascent, ascent);
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std::swap (other.descent, descent);
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std::swap (other.leading, leading);
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}
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//==============================================================================
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TextLayout::TextLayout()
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: width (0), height (0), justification (Justification::topLeft)
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{
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}
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TextLayout::TextLayout (const TextLayout& other)
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: width (other.width), height (other.height),
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justification (other.justification)
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{
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lines.addCopiesOf (other.lines);
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}
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TextLayout::TextLayout (TextLayout&& other) noexcept
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: lines (std::move (other.lines)),
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width (other.width), height (other.height),
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justification (other.justification)
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{
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}
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TextLayout& TextLayout::operator= (TextLayout&& other) noexcept
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{
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lines = std::move (other.lines);
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width = other.width;
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height = other.height;
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justification = other.justification;
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return *this;
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}
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TextLayout& TextLayout::operator= (const TextLayout& other)
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{
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width = other.width;
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height = other.height;
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justification = other.justification;
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lines.clear();
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lines.addCopiesOf (other.lines);
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return *this;
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}
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TextLayout::~TextLayout()
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{
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}
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TextLayout::Line& TextLayout::getLine (int index) const noexcept
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{
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return *lines.getUnchecked (index);
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}
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void TextLayout::ensureStorageAllocated (int numLinesNeeded)
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{
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lines.ensureStorageAllocated (numLinesNeeded);
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}
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void TextLayout::addLine (std::unique_ptr<Line> line)
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{
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lines.add (line.release());
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}
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void TextLayout::draw (Graphics& g, Rectangle<float> area) const
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{
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auto origin = justification.appliedToRectangle (Rectangle<float> (width, getHeight()), area).getPosition();
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auto& context = g.getInternalContext();
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context.saveState();
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auto clip = context.getClipBounds();
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auto clipTop = (float) clip.getY() - origin.y;
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auto clipBottom = (float) clip.getBottom() - origin.y;
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for (auto& line : *this)
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{
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auto lineRangeY = line.getLineBoundsY();
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if (lineRangeY.getEnd() < clipTop)
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continue;
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if (lineRangeY.getStart() > clipBottom)
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break;
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auto lineOrigin = origin + line.lineOrigin;
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for (auto* run : line.runs)
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{
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context.setFont (run->font);
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context.setFill (run->colour);
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for (auto& glyph : run->glyphs)
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context.drawGlyph (glyph.glyphCode, AffineTransform::translation (lineOrigin.x + glyph.anchor.x,
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lineOrigin.y + glyph.anchor.y));
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if (run->font.isUnderlined())
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{
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auto runExtent = run->getRunBoundsX();
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auto lineThickness = run->font.getDescent() * 0.3f;
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context.fillRect ({ runExtent.getStart() + lineOrigin.x, lineOrigin.y + lineThickness * 2.0f,
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runExtent.getLength(), lineThickness });
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}
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}
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}
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context.restoreState();
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}
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void TextLayout::createLayout (const AttributedString& text, float maxWidth)
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{
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createLayout (text, maxWidth, 1.0e7f);
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}
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void TextLayout::createLayout (const AttributedString& text, float maxWidth, float maxHeight)
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{
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lines.clear();
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width = maxWidth;
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height = maxHeight;
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justification = text.getJustification();
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if (! createNativeLayout (text))
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createStandardLayout (text);
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recalculateSize();
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}
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void TextLayout::createLayoutWithBalancedLineLengths (const AttributedString& text, float maxWidth)
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{
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createLayoutWithBalancedLineLengths (text, maxWidth, 1.0e7f);
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}
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void TextLayout::createLayoutWithBalancedLineLengths (const AttributedString& text, float maxWidth, float maxHeight)
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{
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auto minimumWidth = maxWidth / 2.0f;
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auto bestWidth = maxWidth;
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float bestLineProportion = 0.0f;
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while (maxWidth > minimumWidth)
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{
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createLayout (text, maxWidth, maxHeight);
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if (getNumLines() < 2)
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return;
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auto line1 = lines.getUnchecked (lines.size() - 1)->getLineBoundsX().getLength();
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auto line2 = lines.getUnchecked (lines.size() - 2)->getLineBoundsX().getLength();
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auto shortest = jmin (line1, line2);
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auto longest = jmax (line1, line2);
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auto prop = shortest > 0 ? longest / shortest : 1.0f;
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if (prop > 0.9f && prop < 1.1f)
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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 -= 10.0f;
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}
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if (bestWidth != maxWidth)
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createLayout (text, bestWidth, maxHeight);
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}
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//==============================================================================
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namespace TextLayoutHelpers
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{
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struct Token
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{
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Token (const String& t, const Font& f, Colour c, bool whitespace)
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: text (t), font (f), colour (c),
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area (font.getStringWidthFloat (t), f.getHeight()),
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isWhitespace (whitespace),
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isNewLine (t.containsChar ('\n') || t.containsChar ('\r'))
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{}
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const String text;
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const Font font;
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const Colour colour;
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Rectangle<float> area;
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int line;
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float lineHeight;
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const bool isWhitespace, isNewLine;
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Token& operator= (const Token&) = delete;
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};
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struct TokenList
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{
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TokenList() noexcept {}
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void createLayout (const AttributedString& text, TextLayout& layout)
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{
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layout.ensureStorageAllocated (totalLines);
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addTextRuns (text);
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layoutRuns (layout.getWidth(), text.getLineSpacing(), text.getWordWrap());
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int charPosition = 0;
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int lineStartPosition = 0;
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int runStartPosition = 0;
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std::unique_ptr<TextLayout::Line> currentLine;
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std::unique_ptr<TextLayout::Run> currentRun;
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bool needToSetLineOrigin = true;
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for (int i = 0; i < tokens.size(); ++i)
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{
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auto& t = *tokens.getUnchecked (i);
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Array<int> newGlyphs;
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Array<float> xOffsets;
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t.font.getGlyphPositions (getTrimmedEndIfNotAllWhitespace (t.text), newGlyphs, xOffsets);
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if (currentRun == nullptr) currentRun = std::make_unique<TextLayout::Run>();
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if (currentLine == nullptr) currentLine = std::make_unique<TextLayout::Line>();
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const auto numGlyphs = newGlyphs.size();
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charPosition += numGlyphs;
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if (numGlyphs > 0
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&& (! (t.isWhitespace || t.isNewLine) || needToSetLineOrigin))
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{
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currentRun->glyphs.ensureStorageAllocated (currentRun->glyphs.size() + newGlyphs.size());
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auto tokenOrigin = t.area.getPosition().translated (0, t.font.getAscent());
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if (needToSetLineOrigin)
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{
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needToSetLineOrigin = false;
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currentLine->lineOrigin = tokenOrigin;
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}
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auto glyphOffset = tokenOrigin - currentLine->lineOrigin;
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for (int j = 0; j < newGlyphs.size(); ++j)
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{
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auto x = xOffsets.getUnchecked (j);
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currentRun->glyphs.add (TextLayout::Glyph (newGlyphs.getUnchecked (j),
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glyphOffset.translated (x, 0),
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xOffsets.getUnchecked (j + 1) - x));
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}
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}
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if (auto* nextToken = tokens[i + 1])
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{
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if (t.font != nextToken->font || t.colour != nextToken->colour)
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{
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addRun (*currentLine, currentRun.release(), t, runStartPosition, charPosition);
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runStartPosition = charPosition;
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}
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if (t.line != nextToken->line)
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{
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if (currentRun == nullptr)
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currentRun = std::make_unique<TextLayout::Run>();
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addRun (*currentLine, currentRun.release(), t, runStartPosition, charPosition);
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currentLine->stringRange = { lineStartPosition, charPosition };
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if (! needToSetLineOrigin)
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layout.addLine (std::move (currentLine));
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runStartPosition = charPosition;
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lineStartPosition = charPosition;
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needToSetLineOrigin = true;
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||
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|
}
|
||
|
|
}
|
||
|
|
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
|