itemtest.h - mozsearch

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// Copyright (C) 2025 The Qt Company Ltd.

// Copyright (C) 2015 QUIt Coding <info@quitcoding.com>

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

#ifndef ITEMTEST_H

#define ITEMTEST_H

#include "qcanvaspainteritem.h"

#include "qcanvaspainteritemrenderer.h"

#include "../shared/painthelper.h"

class HelloItemRenderer : public QCanvasPainterItemRenderer

public:

    HelloItemRenderer()

        // why this is interesting: because moving an item to a new QQuickWindow

        // automatically destroys and creates a new renderer object, thus

        // ensuring that no graphicsResourcesInvalidated() and similar are

        // needed, unlike the widget that has no dedicated renderer object.

        qDebug() << "HelloItemRenderer" << this << "created";

    void initializeResources(QCanvasPainter *p) override

        qDebug() << "initializeResources" << this;

        // Provide our own QCanvasImage, to verify that a "load-if-not-yet-done"

        // logic works as expected, and it does not break down when the item

        // is moved between windows (and so changes QRhis, losing all graphics

        // resources in the process).

        static QImage logoImage(":/quitlogo.png");

        if (logo.isNull())

            logo = p->addImage(logoImage, QCanvasPainter::ImageFlag::Repeat);

    inline void synchronizeData(QCanvasPainterItem *painterItem) override;

    void paint(QCanvasPainter *p) override

        p->setAntialias(m_antialiasAmount);

        paintHelloItem(p, width(), height(), &logo);

    QCanvasImage logo;

    float m_antialiasAmount;

};

class HelloItem : public QCanvasPainterItem

    Q_OBJECT

    Q_PROPERTY(float aa READ aa WRITE setAa NOTIFY aaChanged)

public:

    HelloItem(QQuickItem *parent = nullptr)

        :  QCanvasPainterItem(parent)

    float aa() const { return m_aa; }

    void setAa(float a)

        if (qFuzzyCompare(a, m_aa))

            return;

        m_aa = a;

        emit aaChanged();

        update();

    QCanvasPainterItemRenderer *createItemRenderer() const override

        return new HelloItemRenderer;

signals:

    void aaChanged();

public:

    float m_aa = 1.0f;

};

inline void HelloItemRenderer::synchronizeData(QCanvasPainterItem *painterItem)

    //qDebug() << "synchronizeData";

    auto *item = static_cast<HelloItem *>(painterItem);

    m_antialiasAmount = item->m_aa;

#endif // ITEMTEST_H