squareseries.h - mozsearch

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// Copyright (C) 2026 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#ifndef SQUARESERIES_H

#define SQUARESERIES_H

#include <QtGraphs/qcustomseries.h>

#include <QtGraphs/qcustomseriescanvasrenderer.h>

#include <QtCore/qlist.h>

#include <QtCore/qrect.h>

#include <QtGui/qcolor.h>

// Handed to SquareSeries via setCustomSeriesPainter() (see below), which takes

// ownership until the CanvasPainter-backend renderer adopts it; from then on

// it's owned and eventually destroyed by the renderer, never by SquareSeries.

// Copies square geometry/color out of SquareSeries in synchronizeData(), which

// runs on the GUI thread while it is blocked at the Qt Quick sync point, so

// that canvasPaint() (render thread) never touches the live series.

class SquarePainter : public QCustomSeriesCanvasRenderer

public:

    void synchronizeData(QCustomSeries *series, QCanvasPainterItem *item) override;

    void canvasPaint(QCanvasPainter *p) override;

private:

    struct RenderSquare

        QRectF rect;

        QColor color;

};

    QList<RenderSquare> m_squares;

};

class SquareSeries : public QCustomSeries

    Q_OBJECT

    QML_ELEMENT

public:

    struct Square

        qreal x = 0;

        qreal y = 0;

        qreal size = 0;

        QColor color;

};

    explicit SquareSeries(QObject *parent = nullptr);

    Q_INVOKABLE void addSquare(qreal x, qreal y, qreal size, const QColor &color);

    Q_INVOKABLE void clearSquares();

    QList<Square> squares() const;

private:

    QList<Square> m_squares;

};

#endif // SQUARESERIES_H