| // Copyright 2019 Google LLC. |
| #ifndef TextLine_DEFINED |
| #define TextLine_DEFINED |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/private/SkTArray.h" |
| #include "include/private/SkTHash.h" |
| #include "modules/skparagraph/include/DartTypes.h" |
| #include "modules/skparagraph/include/Metrics.h" |
| #include "modules/skparagraph/include/TextStyle.h" |
| #include "modules/skparagraph/src/Run.h" |
| #include "src/core/SkSpan.h" |
| |
| namespace skia { |
| namespace textlayout { |
| |
| class TextLine { |
| public: |
| |
| struct ClipContext { |
| const Run* run; |
| size_t pos; |
| size_t size; |
| SkScalar fTextShift; // Shifts the text inside the run so it's placed at the right position |
| SkRect clip; |
| bool clippingNeeded; |
| }; |
| |
| TextLine() = default; |
| ~TextLine() = default; |
| |
| TextLine(ParagraphImpl* master, |
| SkVector offset, |
| SkVector advance, |
| BlockRange blocks, |
| TextRange text, |
| TextRange textWithSpaces, |
| ClusterRange clusters, |
| ClusterRange clustersWithGhosts, |
| SkScalar widthWithSpaces, |
| InternalLineMetrics sizes); |
| |
| void setMaster(ParagraphImpl* master) { fMaster = master; } |
| |
| TextRange trimmedText() const { return fTextRange; } |
| TextRange textWithSpaces() const { return fTextWithWhitespacesRange; } |
| ClusterRange clusters() const { return fClusterRange; } |
| ClusterRange clustersWithSpaces() { return fGhostClusterRange; } |
| Run* ellipsis() const { return fEllipsis.get(); } |
| InternalLineMetrics sizes() const { return fSizes; } |
| bool empty() const { return fTextRange.empty(); } |
| |
| SkScalar height() const { return fAdvance.fY; } |
| SkScalar width() const { |
| return fAdvance.fX + (fEllipsis != nullptr ? fEllipsis->fAdvance.fX : 0); |
| } |
| SkScalar shift() const { return fShift; } |
| SkVector offset() const; |
| |
| SkScalar alphabeticBaseline() const { return fSizes.alphabeticBaseline(); } |
| SkScalar ideographicBaseline() const { return fSizes.ideographicBaseline(); } |
| SkScalar baseline() const { return fSizes.baseline(); } |
| |
| using RunVisitor = std::function<bool(const Run* run, SkScalar runOffset, TextRange textRange, SkScalar* width)>; |
| void iterateThroughVisualRuns(bool includingGhostSpaces, const RunVisitor& runVisitor) const; |
| using RunStyleVisitor = std::function<void(TextRange textRange, const TextStyle& style, const ClipContext& context)>; |
| SkScalar iterateThroughSingleRunByStyles(const Run* run, SkScalar runOffset, TextRange textRange, |
| StyleType styleType, const RunStyleVisitor& visitor) const; |
| |
| |
| using ClustersVisitor = std::function<bool(const Cluster* cluster, ClusterIndex index, bool leftToRight, bool ghost)>; |
| void iterateThroughClustersInGlyphsOrder(bool reverse, bool includeGhosts, const ClustersVisitor& visitor) const; |
| |
| void format(TextAlign effectiveAlign, SkScalar maxWidth); |
| void paint(SkCanvas* canvas); |
| |
| void createEllipsis(SkScalar maxWidth, const SkString& ellipsis, bool ltr); |
| |
| // For testing internal structures |
| void scanStyles(StyleType style, const RunStyleVisitor& visitor); |
| |
| TextAlign assumedTextAlign() const; |
| |
| void setMaxRunMetrics(const InternalLineMetrics& metrics) { fMaxRunMetrics = metrics; } |
| InternalLineMetrics getMaxRunMetrics() const { return fMaxRunMetrics; } |
| |
| ClipContext measureTextInsideOneRun(TextRange textRange, |
| const Run* run, |
| SkScalar runOffsetInLine, |
| SkScalar textOffsetInRunInLine, |
| bool includeGhostSpaces, |
| bool limitToClusters) const; |
| |
| LineMetrics getMetrics() const; |
| |
| private: |
| |
| Run* shapeEllipsis(const SkString& ellipsis, Run* run); |
| void justify(SkScalar maxWidth); |
| |
| void paintText(SkCanvas* canvas, TextRange textRange, const TextStyle& style, const ClipContext& context) const; |
| void paintBackground(SkCanvas* canvas, TextRange textRange, const TextStyle& style, const ClipContext& context) const; |
| void paintShadow(SkCanvas* canvas, TextRange textRange, const TextStyle& style, const ClipContext& context) const; |
| void paintDecorations(SkCanvas* canvas, TextRange textRange, const TextStyle& style, const ClipContext& context) const; |
| |
| void computeDecorationPaint(SkPaint& paint, SkRect clip, const TextStyle& style, SkScalar thickness, |
| SkPath& path) const; |
| |
| bool contains(const Cluster* cluster) const { |
| return fTextRange.contains(cluster->textRange()); |
| } |
| |
| ParagraphImpl* fMaster; |
| BlockRange fBlockRange; |
| TextRange fTextRange; |
| TextRange fTextWithWhitespacesRange; |
| ClusterRange fClusterRange; |
| ClusterRange fGhostClusterRange; |
| |
| SkTArray<size_t, true> fRunsInVisualOrder; |
| SkVector fAdvance; // Text size |
| SkVector fOffset; // Text position |
| SkScalar fShift; // Left right |
| SkScalar fWidthWithSpaces; |
| std::shared_ptr<Run> fEllipsis; // In case the line ends with the ellipsis |
| InternalLineMetrics fSizes; // Line metrics as a max of all run metrics and struts |
| InternalLineMetrics fMaxRunMetrics; // No struts - need it for GetRectForRange(max height) |
| bool fHasBackground; |
| bool fHasShadows; |
| bool fHasDecorations; |
| }; |
| } // namespace textlayout |
| } // namespace skia |
| |
| #endif // TextLine_DEFINED |