qohoswindowproperty.h

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// Copyright (C) 2025 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QOHOSWINDOWPROPERTY_H
#define QOHOSWINDOWPROPERTY_H
 
#include <qohosutils.h>
#include <QtCore/qpointer.h>
#include <QtCore/private/qohoscommon_p.h>
#include <QtCore/qglobal.h>
#include <QtCore/qvariant.h>
#include <QtGui/qwindow.h>
#include <memory>
#include <optional>
 
QT_BEGIN_NAMESPACE
 
template<typename T>
class QOhosPropertyDescriptor
{
public:
    explicit QOhosPropertyDescriptor(const char *name);
 
    const char *name() const;
 
private:
    const char *m_name;
};
 
template<typename T>
QOhosPropertyDescriptor<T>::QOhosPropertyDescriptor(const char *name)
    : m_name(name)
{
    qMetaTypeId<T>();
}
 
template<typename T>
const char *QOhosPropertyDescriptor<T>::name() const
{
    return m_name;
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
void setQOhosPropertyOnQObject(QObject *qObject, T propertyValue);
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::optional<T> tryGetQOhosPropertyFromQObject(QObject *qObject);
 
class QOhosPropertiesStore
{
public:
    explicit QOhosPropertiesStore(QObject *qObject);
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    std::optional<T> tryGetProperty() const;
 
    void notifyPropertyWrite(const QByteArray &propertyName);
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    std::shared_ptr<void> addPropertyWriteCallback(QOhosConsumer<T> propertyWriteCallback);
 
private:
    template<typename T>
    class PropertyWriteConsumersStore
    {
    public:
        void notify(T value);
        std::shared_ptr<void> addConsumer(QOhosConsumer<T> consumer);
 
    private:
        std::vector<std::weak_ptr<QOhosConsumer<T>>> m_consumers;
    };
 
    QObject *objectOrFail() const;
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    void notifyPropertyWriteInternal();
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    std::shared_ptr<PropertyWriteConsumersStore<T>> getOrCreatePropertyWriteConsumersStore();
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    std::shared_ptr<PropertyWriteConsumersStore<T>> getPropertyWriteConsumersStoreOrNull();
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    void registerPropertyNotifierIfMissing();
 
    QPointer<QObject> m_object;
    std::map<const void *, std::shared_ptr<void>> m_propertyWriteConsumersStoresMap;
    std::map<QByteArray, std::function<void()>> m_propertyNameToNotifierMap;
};
 
class QOhosPropertiesProvider
{
public:
    explicit QOhosPropertiesProvider(QOhosPropertiesStore &store);
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    std::optional<T> tryGetProperty() const;
 
    template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
    std::shared_ptr<void> addPropertyWriteCallback(QOhosConsumer<T> propertyWriteCallback);
 
private:
    QOhosPropertiesStore *m_store;
};
 
namespace qohoswindowproperty_h_detail {
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
const char *qObjectOhosPropertyName();
 
template<typename T>
std::optional<T> tryMapFromQVariant(QVariant variant);
 
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
void setQOhosPropertyOnQObject(QObject *qObject, T propertyValue)
{
    qObject->setProperty(
        qohoswindowproperty_h_detail::qObjectOhosPropertyName<T, propertyPtr>(),
        QVariant::fromValue(propertyValue));
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::optional<T> tryGetQOhosPropertyFromQObject(QObject *qObject)
{
    const char *propertyName = qohoswindowproperty_h_detail::qObjectOhosPropertyName<T, propertyPtr>();
    const auto propertyTypeId = qMetaTypeId<T>();
    auto value = qObject->property(propertyName);
 
    if (!value.isValid())
        return {};
 
    auto optValue = qohoswindowproperty_h_detail::tryMapFromQVariant<T>(value);
    if (!optValue.has_value()) {
        qOhosPrintfError(
            "Property \"%s\" type mismatch, expected: %d, got: %d",
            propertyName, propertyTypeId, value.userType());
    }
 
    return optValue;
}
 
inline QOhosPropertiesStore::QOhosPropertiesStore(QObject *qObject)
    : m_object(qObject)
{
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::optional<T> QOhosPropertiesStore::tryGetProperty() const
{
    return tryGetQOhosPropertyFromQObject<T, propertyPtr>(objectOrFail());
}
 
inline void QOhosPropertiesStore::notifyPropertyWrite(const QByteArray &propertyName)
{
    auto notifierIt = m_propertyNameToNotifierMap.find(propertyName);
    if (notifierIt != m_propertyNameToNotifierMap.end())
        notifierIt->second();
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::shared_ptr<void> QOhosPropertiesStore::addPropertyWriteCallback(QOhosConsumer<T> propertyWriteCallback)
{
    registerPropertyNotifierIfMissing<T, propertyPtr>();
    return getOrCreatePropertyWriteConsumersStore<T, propertyPtr>()->addConsumer(std::move(propertyWriteCallback));
}
 
template<typename T>
void QOhosPropertiesStore::PropertyWriteConsumersStore<T>::notify(T value)
{
    auto weakConsumersPendingNotify = std::exchange(m_consumers, {});
    std::vector<std::weak_ptr<QOhosConsumer<T>>> weakConsumersToAdd;
    for (auto &weakConsumerPendingNotify: weakConsumersPendingNotify) {
        auto sharedConsumer = weakConsumerPendingNotify.lock();
        if (sharedConsumer) {
            weakConsumersToAdd.push_back(weakConsumerPendingNotify);
            (*sharedConsumer)(value);
        }
    }
    m_consumers.insert(m_consumers.begin(), weakConsumersToAdd.begin(), weakConsumersToAdd.end());
}
 
template<typename T>
std::shared_ptr<void> QOhosPropertiesStore::PropertyWriteConsumersStore<T>::addConsumer(QOhosConsumer<T> consumer)
{
    auto sharedConsumer = QtOhos::moveToSharedPtr(std::move(consumer));
    m_consumers.emplace_back(sharedConsumer);
    return sharedConsumer;
}
 
inline QObject *QOhosPropertiesStore::objectOrFail() const
{
    QObject *object = m_object;
    if (object == nullptr)
        qOhosReportFatalErrorAndAbort("%s: m_object was null", Q_FUNC_INFO);
    return object;
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
void QOhosPropertiesStore::notifyPropertyWriteInternal()
{
    auto propertyWriteConsumersStore = getPropertyWriteConsumersStoreOrNull<T, propertyPtr>();
    if (!propertyWriteConsumersStore)
        return;
 
    auto propertyValue = tryGetProperty<T, propertyPtr>();
    if (propertyValue.has_value())
        propertyWriteConsumersStore->notify(propertyValue.value());
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::shared_ptr<QOhosPropertiesStore::PropertyWriteConsumersStore<T>> QOhosPropertiesStore::getOrCreatePropertyWriteConsumersStore()
{
    auto propertyWriteConsumersStore = getPropertyWriteConsumersStoreOrNull<T, propertyPtr>();
    if (!propertyWriteConsumersStore) {
        propertyWriteConsumersStore = std::make_shared<PropertyWriteConsumersStore<T>>();
        m_propertyWriteConsumersStoresMap.insert({propertyPtr, propertyWriteConsumersStore});
    }
 
    return propertyWriteConsumersStore;
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::shared_ptr<QOhosPropertiesStore::PropertyWriteConsumersStore<T>> QOhosPropertiesStore::getPropertyWriteConsumersStoreOrNull()
{
    auto propertyWriteConsumersStoresMapIt = m_propertyWriteConsumersStoresMap.find(propertyPtr);
    if (propertyWriteConsumersStoresMapIt == m_propertyWriteConsumersStoresMap.end())
        return nullptr;
    return std::static_pointer_cast<PropertyWriteConsumersStore<T>>(propertyWriteConsumersStoresMapIt->second);
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
void QOhosPropertiesStore::registerPropertyNotifierIfMissing()
{
    auto propertyName = QByteArray(qohoswindowproperty_h_detail::qObjectOhosPropertyName<T, propertyPtr>());
    auto propertyNotifierIt = m_propertyNameToNotifierMap.find(propertyName);
    if (propertyNotifierIt == m_propertyNameToNotifierMap.end()) {
        m_propertyNameToNotifierMap.emplace(
            propertyName,
            [this]() {
                this->notifyPropertyWriteInternal<T, propertyPtr>();
            });
    }
}
 
inline QOhosPropertiesProvider::QOhosPropertiesProvider(QOhosPropertiesStore &store)
    : m_store(&store)
{
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::optional<T> QOhosPropertiesProvider::tryGetProperty() const
{
    return m_store->tryGetProperty<T, propertyPtr>();
}
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
std::shared_ptr<void> QOhosPropertiesProvider::addPropertyWriteCallback(QOhosConsumer<T> propertyWriteCallback)
{
    return m_store->addPropertyWriteCallback<T, propertyPtr>(std::move(propertyWriteCallback));
}
 
namespace qohoswindowproperty_h_detail {
 
template<typename T, const QOhosPropertyDescriptor<T> *propertyPtr>
const char *qObjectOhosPropertyName()
{
    return propertyPtr->name();
}
 
template<typename T>
std::optional<T> tryMapFromQVariant(QVariant variant)
{
    return qMetaTypeId<T>() == variant.userType()
        ? std::optional(variant.value<T>())
        : std::nullopt;
}
 
template<>
inline std::optional<QWindow *> tryMapFromQVariant<QWindow *>(QVariant variant)
{
    if (!variant.canConvert<QWindow *>())
        return {};
    return !variant.isNull()
        ? std::optional(reinterpret_cast<QWindow *>(variant.value<QObject*>()))
        : std::optional<QWindow *>(nullptr);
}
 
}
 
QT_END_NAMESPACE
 
#endif