68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#pragma once
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#include <memory>
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#include <functional>
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#include <QObject>
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#include <QMetaProperty>
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class QVariant;
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class Resource;
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/// Base class for things that can use a resource
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class ResourceObserver
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{
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public:
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virtual ~ResourceObserver();
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protected: // these methods are called by the Resource when something changes
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virtual void resourceUpdated() = 0;
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virtual void setFailure(const QString &) {}
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virtual void setProgress(const int) {}
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private:
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friend class Resource;
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void setSource(std::shared_ptr<Resource> resource) { m_resource = resource; }
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protected:
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template<typename T>
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T get() const { return getInternal(qMetaTypeId<T>()).template value<T>(); }
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QVariant getInternal(const int typeId) const;
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private:
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std::shared_ptr<Resource> m_resource;
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};
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/** Observer for QObject properties
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*
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* Give it a target and the name of a property, and that property will be set when the resource changes.
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*
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* If no name is given an attempt to find a default property for some common classes is done.
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*/
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class QObjectResourceObserver : public QObject, public ResourceObserver
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{
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public:
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explicit QObjectResourceObserver(QObject *target, const char *property = nullptr);
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void resourceUpdated() override;
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private:
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QObject *m_target;
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QMetaProperty m_property;
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};
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template <typename Ret, typename Arg, typename Func>
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class FunctionResourceObserver : public ResourceObserver
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{
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std::function<Ret(Arg)> m_function;
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public:
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template <typename T>
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explicit FunctionResourceObserver(T &&func)
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: m_function(std::forward<Func>(func)) {}
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void resourceUpdated() override
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{
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m_function(get<Arg>());
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}
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};
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