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e525e12061
When clicking in a TextEditor to position the caret, the caret would be placed at the penultimate position when clicking at the end of a line with trailing non-newline whitespaces. Co-authored-by: Aga Janowicz <aga@roli.com>
621 lines
24 KiB
C++
621 lines
24 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE framework.
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Copyright (c) Raw Material Software Limited
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JUCE is an open source framework subject to commercial or open source
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licensing.
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By downloading, installing, or using the JUCE framework, or combining the
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JUCE framework with any other source code, object code, content or any other
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copyrightable work, you agree to the terms of the JUCE End User Licence
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Agreement, and all incorporated terms including the JUCE Privacy Policy and
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the JUCE Website Terms of Service, as applicable, which will bind you. If you
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do not agree to the terms of these agreements, we will not license the JUCE
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framework to you, and you must discontinue the installation or download
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process and cease use of the JUCE framework.
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JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
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JUCE Privacy Policy: https://juce.com/juce-privacy-policy
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JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/
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Or:
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You may also use this code under the terms of the AGPLv3:
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https://www.gnu.org/licenses/agpl-3.0.en.html
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THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
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WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
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MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.
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==============================================================================
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*/
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namespace juce::detail
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{
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void drawJustifiedText (const JustifiedText& text, const Graphics& g, AffineTransform);
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//==============================================================================
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static constexpr auto maxWidthTolerance = 0.005f;
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static int64 getNumLeadingWhitespaces (Span<const ShapedGlyph> glyphs)
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{
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const auto it = std::find_if_not (glyphs.begin(),
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glyphs.end(),
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[&] (const auto& g) { return g.isWhitespace(); });
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return (int64) std::distance (glyphs.begin(), it);
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}
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static int64 getNumTrailingWhitespaces (Span<const ShapedGlyph> glyphs)
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{
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if (glyphs.empty())
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return 0;
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int64 trailingWhitespaces = 0;
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for (auto it = glyphs.end(); --it >= glyphs.begin() && it->isWhitespace();)
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++trailingWhitespaces;
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return trailingWhitespaces;
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}
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struct NumWhitespaces
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{
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int64 total{}, leading{}, trailing{};
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};
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static NumWhitespaces getNumWhitespaces (Span<const ShapedGlyph> glyphs)
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{
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const auto total = std::count_if (glyphs.begin(),
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glyphs.end(),
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[] (const auto& g) { return g.isWhitespace(); });
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return { total, getNumLeadingWhitespaces (glyphs), getNumTrailingWhitespaces (glyphs) };
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}
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struct LineLength
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{
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float total{}, withoutTrailingWhitespaces{};
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};
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static LineLength getMainAxisLineLength (Span<const ShapedGlyph> glyphs)
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{
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const auto total = std::accumulate (glyphs.begin(),
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glyphs.end(),
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0.0f,
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[] (auto acc, const auto& g) { return acc + g.advance.getX(); });
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auto trailingWhitespacesLength = 0.0f;
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if (glyphs.empty())
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return {};
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for (auto it = glyphs.end(); --it >= glyphs.begin() && it->isWhitespace();)
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trailingWhitespacesLength += it->advance.getX();
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return { total, total - trailingWhitespacesLength };
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}
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static float getMainAxisLineLength (Span<const ShapedGlyph> glyphs, bool trailingWhitespacesShouldFit)
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{
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const auto lengths = getMainAxisLineLength (glyphs);
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return trailingWhitespacesShouldFit ? lengths.total : lengths.withoutTrailingWhitespaces;
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}
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struct MainAxisLineAlignment
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{
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float anchor{}, extraWhitespaceAdvance{}, effectiveLineLength{};
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Range<int64> stretchableWhitespaces;
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};
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static MainAxisLineAlignment getMainAxisLineAlignment (Justification justification,
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Span<const ShapedGlyph> glyphs,
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LineLength lineLength,
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std::optional<float> maxWidthOpt,
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std::optional<float> alignmentWidthOpt,
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bool trailingWhitespacesShouldFit)
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{
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const auto effectiveLineLength = (trailingWhitespacesShouldFit ? lineLength.total
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: lineLength.withoutTrailingWhitespaces);
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const auto alignmentWidth = alignmentWidthOpt.value_or (maxWidthOpt.value_or (0.0f));
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const auto tooLong = alignmentWidth + maxWidthTolerance < effectiveLineLength;
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MainAxisLineAlignment result;
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result.effectiveLineLength = effectiveLineLength;
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// The alignment width opt is supporting the TextEditor use-case where all text remains visible
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// with scrolling, even if longer than the alignment width. We don't need to worry about the
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// front of and RTL text being visually truncated, because nothing is truncated.
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if (tooLong && alignmentWidthOpt.has_value())
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return result;
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const auto mainAxisLineOffset = [&]
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{
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if (tooLong)
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{
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const auto approximateIsLeftToRight = [&]
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{
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if (glyphs.empty())
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return true;
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return glyphs.front().cluster <= glyphs.back().cluster;
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}();
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// We don't have to align LTR text, but we need to ensure that it's the logical back of
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// RTL text that falls outside the bounds.
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if (approximateIsLeftToRight)
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return 0.0f;
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return alignmentWidth - effectiveLineLength;
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}
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if (justification.testFlags (Justification::horizontallyCentred))
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{
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return (alignmentWidth - lineLength.withoutTrailingWhitespaces) / 2.0f;
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}
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if (justification.testFlags (Justification::right))
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return alignmentWidth - effectiveLineLength;
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return 0.0f;
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}();
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const auto numWhitespaces = getNumWhitespaces (glyphs);
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const auto stretchableWhitespaces = [&]() -> Range<int64>
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{
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if (! justification.testFlags (Justification::horizontallyJustified) || tooLong)
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return {};
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return { numWhitespaces.leading, (int64) glyphs.size() - numWhitespaces.trailing };
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}();
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const auto extraWhitespaceAdvance = [&]
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{
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if (! justification.testFlags (Justification::horizontallyJustified) || tooLong)
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return 0.0f;
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const auto numWhitespacesBetweenWords = numWhitespaces.total
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- numWhitespaces.leading
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- numWhitespaces.trailing;
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return numWhitespacesBetweenWords > 0 ? (alignmentWidth - effectiveLineLength) / (float) numWhitespacesBetweenWords
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: 0.0f;
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}();
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return { mainAxisLineOffset, extraWhitespaceAdvance, effectiveLineLength, stretchableWhitespaces };
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}
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struct LineInfo
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{
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float lineHeight{}, maxAscent{};
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MainAxisLineAlignment mainAxisLineAlignment;
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};
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static float getCrossAxisStartingAnchor (Justification justification,
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Span<const LineInfo> lineInfos,
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std::optional<float> height,
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float leading)
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{
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if (lineInfos.empty())
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return 0.0f;
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const auto minimumTop = lineInfos.front().maxAscent * leading;
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if (! height.has_value())
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return minimumTop;
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const auto textHeight = std::accumulate (lineInfos.begin(),
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lineInfos.end(),
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0.0f,
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[leading] (auto acc, const auto info) { return acc + info.lineHeight * leading; });
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if (justification.testFlags (Justification::verticallyCentred))
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return (*height - textHeight) / 2.0f + lineInfos.front().maxAscent;
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if (justification.testFlags (Justification::bottom))
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{
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return *height - textHeight + lineInfos.front().maxAscent * leading;
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}
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return minimumTop;
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}
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JustifiedText::JustifiedText (const SimpleShapedText* t, const ShapedTextOptions& options)
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: shapedText (*t)
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{
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std::vector<LineInfo> lineInfos;
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for (const auto [range, lineNumber] : shapedText.getLineNumbersForGlyphRanges())
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{
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// This is guaranteed by the RangedValues implementation. You can't assign a value to an
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// empty range.
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jassert (! range.isEmpty());
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const auto fonts = shapedText.getResolvedFonts().getIntersectionsWith (range);
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const auto lineHeight = std::accumulate (fonts.begin(),
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fonts.end(),
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0.0f,
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[] (auto acc, const auto& rangedFont)
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{ return std::max (acc, rangedFont.value.getHeight()); });
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const auto maxAscent = std::accumulate (fonts.begin(),
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fonts.end(),
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0.0f,
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[] (auto acc, const auto& rangedFont)
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{ return std::max (acc, rangedFont.value.getAscent()); });
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const auto glyphs = shapedText.getGlyphs (range);
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const auto lineLength = getMainAxisLineLength (glyphs);
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auto m = [&]
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{
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return getMainAxisLineAlignment (options.getJustification(),
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glyphs,
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lineLength,
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options.getWordWrapWidth(),
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options.getAlignmentWidth(),
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options.getTrailingWhitespacesShouldFit());
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}();
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const auto containsHardBreak = shapedText.getCodepoint (range.getEnd() - 1) == 0xa
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|| shapedText.getCodepoint (range.getStart()) == 0xa;
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if (containsHardBreak || lineNumber == shapedText.getLineNumbersForGlyphRanges().back().value)
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{
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m.extraWhitespaceAdvance = {};
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m.stretchableWhitespaces = {};
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}
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lineInfos.push_back ({ lineHeight, maxAscent, std::move (m) });
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minimumRequiredWidthsForLine.push_back (options.getTrailingWhitespacesShouldFit() ? lineLength.total
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: lineLength.withoutTrailingWhitespaces);
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}
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auto baseline = options.isBaselineAtZero() ? 0.0f
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: getCrossAxisStartingAnchor (options.getJustification(),
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lineInfos,
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options.getHeight(),
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options.getLeading());
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detail::Ranges::Operations ops;
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std::optional<float> top;
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for (const auto [lineIndex, lineInfo] : enumerate (lineInfos))
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{
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const auto lineNumber = shapedText.getLineNumbersForGlyphRanges().getItem ((size_t) lineIndex);
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const auto range = lineNumber.range;
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const auto maxDescent = lineInfo.lineHeight - lineInfo.maxAscent;
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const auto nextLineTop = baseline + options.getLeading() * maxDescent + options.getAdditiveLineSpacing();
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if (! top.has_value())
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top = baseline - options.getLeading() * lineInfo.maxAscent;
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lineMetricsForGlyphRange.set (range,
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{ lineNumber.value,
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{ lineInfo.mainAxisLineAlignment.anchor, baseline },
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lineInfo.maxAscent * options.getLeading(),
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(lineInfo.lineHeight - lineInfo.maxAscent) * options.getLeading(),
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lineInfo.mainAxisLineAlignment.effectiveLineLength
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+ lineInfo.mainAxisLineAlignment.extraWhitespaceAdvance,
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*top,
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nextLineTop },
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ops,
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MergeEqualItemsNo{});
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whitespaceStretch.set (range, 0.0f, ops);
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const auto stretchRange = lineInfo.mainAxisLineAlignment.stretchableWhitespaces + range.getStart();
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whitespaceStretch.set (stretchRange,
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lineInfo.mainAxisLineAlignment.extraWhitespaceAdvance,
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ops);
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ops.clear();
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const auto nextLineMaxAscent = lineIndex < (int) lineInfos.size() - 1 ? lineInfos[(size_t) lineIndex + 1].maxAscent : 0.0f;
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baseline = nextLineTop + options.getLeading() * nextLineMaxAscent;
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top = nextLineTop;
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}
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rangesToDraw.set ({ 0, (int64) shapedText.getGlyphs().size() }, DrawType::normal, ops);
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if (options.getDrawLinesInFull())
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return;
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//==============================================================================
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// Everything above this line should work well given none of the lines were too
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// long. When Options::getMaxNumLines() == 0 this is guaranteed by SimpleShapedText.
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// The remaining logic below is for supporting
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// GlyphArrangement::addFittedText() when the maximum number of lines is
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// constrained.
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if (lineMetricsForGlyphRange.isEmpty())
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return;
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const auto lastLineMetrics = lineMetricsForGlyphRange.back();
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const auto lastLineGlyphRange = lastLineMetrics.range;
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const auto lastLineGlyphs = shapedText.getGlyphs (lastLineGlyphRange);
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const auto lastLineLengths = getMainAxisLineLength (lastLineGlyphs);
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const auto effectiveLength = options.getTrailingWhitespacesShouldFit() ? lastLineLengths.total
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: lastLineLengths.withoutTrailingWhitespaces;
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if (! options.getWordWrapWidth().has_value()
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|| effectiveLength <= *options.getWordWrapWidth() + maxWidthTolerance)
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return;
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const auto cutoffAtFront = lastLineMetrics.value.anchor.getX() < 0.0f - maxWidthTolerance;
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const auto getLastLineVisibleRange = [&] (float ellipsisLength)
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{
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const auto r = [&]() -> Range<int64>
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{
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if (cutoffAtFront)
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{
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auto length = lastLineLengths.total;
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for (auto it = lastLineGlyphs.begin(); it < lastLineGlyphs.end(); ++it)
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{
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length -= it->advance.getX();
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if (! options.getWordWrapWidth().has_value()
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|| *options.getWordWrapWidth() >= ellipsisLength + length)
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{
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return { (int64) std::distance (lastLineGlyphs.begin(), it) + 1,
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(int64) lastLineGlyphs.size() };
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}
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}
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}
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else
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{
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auto length = lastLineLengths.total;
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for (auto it = lastLineGlyphs.end() - 1; it >= lastLineGlyphs.begin(); --it)
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{
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length -= it->advance.getX();
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if (! options.getWordWrapWidth().has_value()
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|| *options.getWordWrapWidth() >= ellipsisLength + length)
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{
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return { 0, (int64) std::distance (lastLineGlyphs.begin(), it) };
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}
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}
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}
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return {};
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}();
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return r.movedToStartAt (r.getStart() + lastLineGlyphRange.getStart());
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};
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const auto lastLineVisibleRangeWithoutEllipsis = getLastLineVisibleRange (0.0f);
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const auto eraseLastLineFromRangesToDraw = [&]
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{
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rangesToDraw.eraseFrom (lastLineGlyphRange.getStart(), ops);
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ops.clear();
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};
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eraseLastLineFromRangesToDraw();
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rangesToDraw.set (lastLineVisibleRangeWithoutEllipsis, DrawType::normal, ops);
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ops.clear();
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if (options.getEllipsis().isEmpty())
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{
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return;
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}
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//==============================================================================
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// More logic supporting using ellipses
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const auto fontForEllipsis = [&]
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{
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const auto lastLineFonts = shapedText.getResolvedFonts().getIntersectionsWith (lastLineGlyphRange);
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if (cutoffAtFront)
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return lastLineFonts.front().value;
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return lastLineFonts.back().value;
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}();
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ellipsis.emplace (&options.getEllipsis(), ShapedTextOptions {}.withFont (fontForEllipsis));
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const auto lastLineVisibleRange = getLastLineVisibleRange (getMainAxisLineLength (ellipsis->getGlyphs(),
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options.getTrailingWhitespacesShouldFit()));
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eraseLastLineFromRangesToDraw();
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rangesToDraw.set (lastLineVisibleRange, DrawType::normal, ops);
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ops.clear();
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if (cutoffAtFront)
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rangesToDraw.set (Range<int64>::withStartAndLength (lastLineVisibleRange.getStart() - 1, 1), DrawType::ellipsis, ops);
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else
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rangesToDraw.set (Range<int64>::withStartAndLength (lastLineVisibleRange.getEnd(), 1), DrawType::ellipsis, ops);
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ops.clear();
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const auto lineWithEllipsisGlyphs = [&]
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{
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std::vector<ShapedGlyph> result;
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const auto pushEllipsisGlyphs = [&]
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{
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const auto& range = ellipsis->getGlyphs();
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result.insert (result.begin(), range.begin(), range.end());
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};
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if (cutoffAtFront)
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pushEllipsisGlyphs();
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const auto& range = shapedText.getGlyphs (lastLineVisibleRange);
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result.insert (result.end(), range.begin(), range.end());
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if (! cutoffAtFront)
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pushEllipsisGlyphs();
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return result;
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}();
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const auto realign = [&]
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{
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return getMainAxisLineAlignment (options.getJustification(),
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lineWithEllipsisGlyphs,
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getMainAxisLineLength (lineWithEllipsisGlyphs),
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options.getWordWrapWidth(),
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options.getAlignmentWidth(),
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options.getTrailingWhitespacesShouldFit());
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}();
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lastLineMetrics.value.anchor.setX (realign.anchor);
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whitespaceStretch.set (lastLineGlyphRange, 0.0f, ops);
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whitespaceStretch.set (realign.stretchableWhitespaces + lastLineVisibleRange.getStart(),
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realign.extraWhitespaceAdvance, ops);
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}
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int64 JustifiedText::getGlyphIndexToTheRightOf (Point<float> p) const
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{
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auto lineIt = lineMetricsForGlyphRange.begin();
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float lineTop = 0.0f;
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while (lineIt != lineMetricsForGlyphRange.end())
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{
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const auto nextLineTop = lineIt->value.nextLineTop;
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if (lineTop <= p.getY() && p.getY() < nextLineTop)
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break;
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lineTop = nextLineTop;
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++lineIt;
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}
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if (lineIt == lineMetricsForGlyphRange.end())
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return 0;
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const auto glyphsInLine = shapedText.getGlyphs (lineIt->range);
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auto glyphX = lineIt->value.anchor.getX();
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for (const auto [glyphIndex, glyph] : enumerate (glyphsInLine, lineIt->range.getStart()))
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{
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if (p.getX() < glyphX + glyph.advance.getX() / 2.0f || glyph.isNewline())
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return glyphIndex;
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glyphX += glyph.advance.getX();
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}
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return lineIt->range.getEnd();
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}
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GlyphAnchorResult JustifiedText::getGlyphAnchor (int64 index) const
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{
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jassert (index >= 0);
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|
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if (lineMetricsForGlyphRange.isEmpty())
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return {};
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|
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const auto lineItem = lineMetricsForGlyphRange.getItemWithEnclosingRange (index)
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.value_or (lineMetricsForGlyphRange.back());
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|
|
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const auto indexInLine = index - lineItem.range.getStart();
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|
|
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GlyphAnchorResult anchor { lineItem.value.anchor, lineItem.value.maxAscent, lineItem.value.maxDescent };
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|
|
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for (auto [i, glyph] : enumerate (shapedText.getGlyphs (lineItem.range), int64{}))
|
|
{
|
|
if (i == indexInLine)
|
|
{
|
|
anchor.anchor += glyph.offset;
|
|
return anchor;
|
|
}
|
|
|
|
anchor.anchor += glyph.advance;
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|
}
|
|
|
|
return anchor;
|
|
}
|
|
|
|
RectangleList<float> JustifiedText::getGlyphsBounds (Range<int64> glyphRange) const
|
|
{
|
|
RectangleList<float> bounds;
|
|
|
|
if (lineMetricsForGlyphRange.isEmpty())
|
|
return bounds;
|
|
|
|
const auto getBounds = [&] (const LineMetrics& line, int64 lineStart, int64 boundsStart, int64 boundsEnd) -> Rectangle<float>
|
|
{
|
|
const auto glyphsBefore = shapedText.getGlyphs ({ lineStart, boundsStart });
|
|
|
|
const auto xStart = std::accumulate (glyphsBefore.begin(),
|
|
glyphsBefore.end(),
|
|
line.anchor.getX(),
|
|
[] (auto sum, auto glyph)
|
|
{
|
|
return sum + glyph.advance.getX();
|
|
});
|
|
|
|
const auto glyphs = shapedText.getGlyphs ({ boundsStart, boundsEnd });
|
|
|
|
const auto xEnd = std::accumulate (glyphs.begin(),
|
|
glyphs.end(),
|
|
xStart,
|
|
[&] (auto sum, auto glyph)
|
|
{
|
|
return sum + glyph.advance.getX();
|
|
});
|
|
|
|
return { { xStart, line.top }, { xEnd, line.nextLineTop } };
|
|
};
|
|
|
|
for (auto consumeFrom = glyphRange.getStart(); consumeFrom < glyphRange.getEnd();)
|
|
{
|
|
const auto lineItem = lineMetricsForGlyphRange.getItemWithEnclosingRange (consumeFrom);
|
|
|
|
if (! lineItem.has_value())
|
|
break;
|
|
|
|
const auto consumeTo = std::min (glyphRange.getEnd(), lineItem->range.getEnd());
|
|
bounds.add (getBounds (lineItem->value, lineItem->range.getStart(), consumeFrom, consumeTo));
|
|
|
|
consumeFrom = consumeTo;
|
|
}
|
|
|
|
return bounds;
|
|
}
|
|
|
|
float JustifiedText::getHeight() const
|
|
{
|
|
if (lineMetricsForGlyphRange.isEmpty())
|
|
return 0.0f;
|
|
|
|
return lineMetricsForGlyphRange.back().value.nextLineTop;
|
|
}
|
|
|
|
void drawJustifiedText (const JustifiedText& text, const Graphics& g, AffineTransform transform)
|
|
{
|
|
auto& context = g.getInternalContext();
|
|
context.saveState();
|
|
const ScopeGuard restoreGraphicsContext { [&context] { context.restoreState(); } };
|
|
|
|
text.accessTogetherWith ([&] (auto glyphs, auto positions, auto font, auto, auto)
|
|
{
|
|
if (context.getFont() != font)
|
|
context.setFont (font);
|
|
|
|
std::vector<uint16_t> glyphIds (glyphs.size());
|
|
|
|
std::transform (glyphs.begin(),
|
|
glyphs.end(),
|
|
glyphIds.begin(),
|
|
[] (auto& glyph) { return (uint16_t) glyph.glyphId; });
|
|
|
|
context.drawGlyphs (glyphIds, positions, transform);
|
|
});
|
|
}
|
|
|
|
} // namespace juce::detail
|