83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
#pragma once
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#include <QColor>
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#include <QImage>
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#include <QObject>
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#include <QString>
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#include <QUrl>
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#include <QtQml>
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#include <memory>
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#include <jkqtmathtext/jkqtmathtext.h>
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namespace ZShell::llm {
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// QML wrapper around JKQTMathText (JKQtPlotter's LaTeX renderer).
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//
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// Parses a display-math string and renders it into a transparent
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// QImage at the given device pixel ratio, off the GUI thread (with a
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// process-wide cache keyed on the full render state, so re-opening a
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// chat does not re-render the same equations). QML displays the image
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// (scaling it to the bubble width when needed) and falls back to the
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// raw LaTeX when parsing fails.
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class LlmMathText : public QObject {
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Q_OBJECT
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QML_ELEMENT
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Q_PROPERTY(QString latex READ latex WRITE setLatex NOTIFY changed)
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Q_PROPERTY(QColor color READ color WRITE setColor NOTIFY changed)
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Q_PROPERTY(double fontPointSize READ fontPointSize WRITE setFontPointSize NOTIFY changed)
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Q_PROPERTY(qreal devicePixelRatio READ devicePixelRatio WRITE setDevicePixelRatio NOTIFY changed)
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Q_PROPERTY(QImage image READ image NOTIFY changed)
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// data: URL of the rendered equation; usable directly as
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// Image.source (a raw QImage is not).
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Q_PROPERTY(QUrl imageUrl READ imageUrl NOTIFY changed)
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// Logical (CSS pixel) size of the rendered equation.
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Q_PROPERTY(qreal width READ width NOTIFY changed)
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Q_PROPERTY(qreal height READ height NOTIFY changed)
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Q_PROPERTY(bool ok READ ok NOTIFY changed)
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public:
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explicit LlmMathText(QObject* parent = nullptr);
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[[nodiscard]] QString latex() const { return m_latex; }
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void setLatex(const QString& value);
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[[nodiscard]] QColor color() const { return m_color; }
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void setColor(const QColor& value);
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[[nodiscard]] double fontPointSize() const { return m_fontPointSize; }
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void setFontPointSize(double value);
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[[nodiscard]] qreal devicePixelRatio() const { return m_devicePixelRatio; }
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void setDevicePixelRatio(qreal value);
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[[nodiscard]] QImage image() const { return m_image; }
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[[nodiscard]] QUrl imageUrl() const { return m_imageUrl; }
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[[nodiscard]] qreal width() const { return m_width; }
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[[nodiscard]] qreal height() const { return m_height; }
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[[nodiscard]] bool ok() const { return m_ok; }
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Q_SIGNALS:
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void changed();
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private:
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void reRender();
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// Shared so an in-flight worker render keeps the renderer alive if
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// this object (and its QML item) is destroyed mid-render.
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std::shared_ptr<JKQTMathText> m_renderer;
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QString m_latex;
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QColor m_color;
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double m_fontPointSize = 12.0;
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qreal m_devicePixelRatio = 1.0;
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QImage m_image;
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QUrl m_imageUrl;
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qreal m_width = 0;
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qreal m_height = 0;
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bool m_ok = false;
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// Bumps on every reRender; a delivery carrying an older id was
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// superseded and is dropped.
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int m_requestId = 0;
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bool m_inFlight = false;
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};
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} // namespace ZShell::llm
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