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Telegram/lib_ui/ui/text/text_renderer.h

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+// This file is part of Desktop App Toolkit,
+// a set of libraries for developing nice desktop applications.
+//
+// For license and copyright information please follow this link:
+// https://github.com/desktop-app/legal/blob/master/LEGAL
+//
+#pragma once
+
+#include "ui/text/text.h"
+#include "ui/text/text_block.h"
+#include "ui/text/text_custom_emoji.h"
+
+#include <private/qtextengine_p.h>
+
+class QTextItemInt;
+struct QScriptAnalysis;
+struct QScriptLine;
+struct QScriptItem;
+
+namespace Ui::Text {
+
+inline constexpr auto kQuoteCollapsedLines = 3;
+
+class AbstractBlock;
+
+struct FixedRange {
+	QFixed from;
+	QFixed till;
+
+	[[nodiscard]] bool empty() const {
+		return (till <= from);
+	}
+};
+
+[[nodiscard]] FixedRange Intersected(FixedRange a, FixedRange b);
+[[nodiscard]] bool Intersects(FixedRange a, FixedRange b);
+[[nodiscard]] FixedRange United(FixedRange a, FixedRange b);
+[[nodiscard]] bool Distinct(FixedRange a, FixedRange b);
+
+class Renderer final {
+public:
+	explicit Renderer(const Ui::Text::String &t);
+	~Renderer();
+
+	void draw(QPainter &p, const PaintContext &context);
+	[[nodiscard]] StateResult getState(
+		QPoint point,
+		GeometryDescriptor geometry,
+		StateRequest request);
+
+private:
+	static constexpr int kSpoilersRectsSize = 512;
+
+	struct BidiControl;
+
+	void enumerate();
+
+	[[nodiscard]] crl::time now() const;
+	void initNextParagraph(
+		Blocks::const_iterator i,
+		int16 paragraphIndex,
+		Qt::LayoutDirection direction);
+	void initNextLine();
+	void initParagraphBidi();
+	bool drawLine(
+		uint16 lineEnd,
+		Blocks::const_iterator blocksEnd);
+	[[nodiscard]] FixedRange findSelectEmojiRange(
+		const QScriptItem &si,
+		std::vector<Block>::const_iterator blockIt,
+		QFixed x,
+		TextSelection selection) const;
+	[[nodiscard]] FixedRange findSelectTextRange(
+		const QScriptItem &si,
+		int itemStart,
+		int itemEnd,
+		QFixed x,
+		QFixed itemWidth,
+		const QTextItemInt &gf,
+		TextSelection selection) const;
+	void fillSelectRange(FixedRange range);
+	void pushHighlightRange(FixedRange range);
+	void pushSpoilerRange(
+		FixedRange range,
+		FixedRange selected,
+		bool isElidedItem,
+		bool rtl);
+	void fillRectsFromRanges();
+	void fillRectsFromRanges(
+		QVarLengthArray<QRect, kSpoilersRectsSize> &rects,
+		QVarLengthArray<FixedRange> &ranges);
+	void paintSpoilerRects();
+	void paintSpoilerRects(
+		const QVarLengthArray<QRect, kSpoilersRectsSize> &rects,
+		const style::color &color,
+		int index);
+	void composeHighlightPath();
+	[[nodiscard]] const AbstractBlock *markBlockForElisionGetEnd(
+		int blockIndex);
+	void setElideBidi(int elideStart);
+	void prepareElidedLine(
+		QString &lineText,
+		int lineStart,
+		int &lineLength,
+		const AbstractBlock *&endBlock,
+		int recursed = 0);
+	void prepareElisionAt(
+		QString &lineText,
+		int &lineLength,
+		uint16 position);
+	void restoreAfterElided();
+
+	void fillParagraphBg(int paddingBottom);
+
+	void applyBlockProperties(
+		QTextEngine &e,
+		not_null<const AbstractBlock*> block);
+	[[nodiscard]] ClickHandlerPtr lookupLink(
+		const AbstractBlock *block) const;
+
+	const String *_t = nullptr;
+	GeometryDescriptor _geometry;
+	SpoilerData *_spoiler = nullptr;
+	SpoilerMessCache *_spoilerCache = nullptr;
+	QPainter *_p = nullptr;
+	const style::TextPalette *_palette = nullptr;
+	std::span<SpecialColor> _colors;
+	bool _pausedEmoji = false;
+	bool _pausedSpoiler = false;
+	style::align _align = style::al_topleft;
+	QPen _originalPen;
+	QPen _originalPenSelected;
+	QPen _quoteLinkPenOverride;
+	const QPen *_currentPen = nullptr;
+	const QPen *_currentPenSelected = nullptr;
+	struct {
+		bool spoiler = false;
+		bool selectActiveBlock = false; // For monospace.
+	} _background;
+	int _yFrom = 0;
+	int _yTo = 0;
+	TextSelection _selection = { 0, 0 };
+	bool _fullWidthSelection = true;
+	HighlightInfoRequest *_highlight = nullptr;
+	const QChar *_str = nullptr;
+	mutable crl::time _cachedNow = 0;
+	float64 _spoilerOpacity = 0.;
+	QVarLengthArray<FixedRange> _spoilerRanges;
+	QVarLengthArray<FixedRange> _spoilerSelectedRanges;
+	QVarLengthArray<FixedRange> _highlightRanges;
+	QVarLengthArray<QRect, kSpoilersRectsSize> _spoilerRects;
+	QVarLengthArray<QRect, kSpoilersRectsSize> _spoilerSelectedRects;
+	QVarLengthArray<QRect, kSpoilersRectsSize> _highlightRects;
+
+	std::optional<CustomEmoji::Context> _customEmojiContext;
+	int _customEmojiSkip = 0;
+	int _indexOfElidedBlock = -1; // For spoilers.
+
+	// current paragraph data
+	Blocks::const_iterator _paragraphStartBlock;
+	Qt::LayoutDirection _paragraphDirection = Qt::LayoutDirectionAuto;
+	int _paragraphStart = 0;
+	int _paragraphLength = 0;
+	QVarLengthArray<QScriptAnalysis, 4096> _paragraphAnalysis;
+
+	// current quote data
+	QuoteDetails *_quote = nullptr;
+	Qt::LayoutDirection _quoteDirection = Qt::LayoutDirectionAuto;
+	int _quoteShift = 0;
+	int _quoteIndex = 0;
+	QMargins _quotePadding;
+	int _quoteLinesLeft = -1;
+	int _quoteTop = 0;
+	int _quoteLineTop = 0;
+	QuotePaintCache *_quotePreCache = nullptr;
+	QuotePaintCache *_quoteBlockquoteCache = nullptr;
+	bool _quotePreValid = false;
+	bool _quoteBlockquoteValid = false;
+
+	ClickHandlerPtr _quoteExpandLink;
+	bool _quoteExpandLinkLookup = false;
+
+	// current line data
+	style::font _f;
+	int _startLeft = 0;
+	int _startTop = 0;
+	int _startLineWidth = 0;
+	QFixed _x, _wLeft, _last_rPadding;
+	int _y = 0;
+	int _yDelta = 0;
+	int _lineIndex = 0;
+	int _lineHeight = 0;
+	int _fontHeight = 0;
+	bool _breakEverywhere = false;
+	bool _elidedLine = false;
+
+	// elided hack support
+	int _blocksSize = 0;
+	int _elideSavedIndex = 0;
+	std::optional<Block> _elideSavedBlock;
+
+	int _lineStart = 0;
+	int _localFrom = 0;
+	int _lineStartBlock = 0;
+	QFixed _lineStartPadding = 0;
+	QFixed _lineWidth = 0;
+
+	// link and symbol resolve
+	QFixed _lookupX = 0;
+	int _lookupY = 0;
+	bool _lookupSymbol = false;
+	bool _lookupLink = false;
+	StateRequest _lookupRequest;
+	StateResult _lookupResult;
+
+	bool _elisionMiddle = false;
+
+};
+
+} // namespace Ui::Text