119 lines
2.0 KiB
C++
119 lines
2.0 KiB
C++
/*
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This file is part of KDDockWidgets.
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SPDX-FileCopyrightText: 2023 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
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Author: Sérgio Martins <sergio.martins@kdab.com>
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SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
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Contact KDAB at <info@kdab.com> for commercial licensing options.
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*/
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#pragma once
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/// ObjectGuard provides a weak reference to an object
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/// i.e., it becomes null automatically once the object is destroyed
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/// For Qt, this is simply QPointer, for Flutter it's an equivalent.
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#if defined(KDDW_FRONTEND_QT) || defined(KDDW_FLUTTER_QWINDOW)
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#include <QPointer>
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namespace KDDockWidgets::Core {
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template<typename T>
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using ObjectGuard = QT_PREPEND_NAMESPACE(QPointer<T>);
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}
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#else
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#include "Logging_p.h"
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#include "Controller_p.h"
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#include "core/layouting/Item_p.h"
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namespace KDDockWidgets::Core {
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template<typename T>
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class ObjectGuard
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{
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public:
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ObjectGuard() = default;
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ObjectGuard(T *o)
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{
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setObject(o);
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}
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ObjectGuard(const ObjectGuard &other)
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{
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setObject(other.obj);
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}
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ObjectGuard &
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operator=(T *o)
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{
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setObject(o);
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return *this;
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}
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~ObjectGuard()
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{
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clear();
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}
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operator bool() const
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{
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return obj != nullptr;
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}
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bool isNull() const
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{
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return obj == nullptr;
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}
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T *operator->() const
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{
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return obj;
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}
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operator T *() const
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{
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return obj;
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}
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T *data() const
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{
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return obj;
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}
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void clear()
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{
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if (obj) {
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conn = KDBindings::ScopedConnection();
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obj = nullptr;
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}
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}
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private:
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void setObject(T *o)
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{
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if (obj == o)
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return;
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clear();
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obj = o;
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if (auto object = dynamic_cast<Core::Object *>(o)) {
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conn = object->aboutToBeDeleted.connect([this] {
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obj = nullptr;
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});
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}
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}
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T *obj = nullptr;
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KDBindings::ScopedConnection conn;
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};
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}
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#endif
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