57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
#ifndef QOBJECTLISTCAST_H
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#define QOBJECTLISTCAST_H
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#include <QObject>
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template<class T>
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/**
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* @brief Statically cast a QObjectList (aka QList<QObject*>) to a QList of any type (must be a QObject derivative)
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*
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* Best used to convert the list from a QObject's children() list to a list of another type, assuming it's known that
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* all children are of a certain type.
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*
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* As a static cast, the objects in the QObjectList must all be of the SAME type or the behavior
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* is undefined.
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*/
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QList<T*> static_qobjectlist_cast(const QObjectList& list) {
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QList<T*> new_list;
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new_list.reserve(list.size());
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for (int i=0;i<list.size();i++) {
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new_list.append(static_cast<T*>(list.at(i)));
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}
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return new_list;
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}
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template<class T>
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/**
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* @brief Dynamically cast a QObjectList (aka QList<QObject*>) to a QList of any type (must be a QObject derivative)
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*
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* Best used to convert the list from a QObject's children() list to a list of another type, assuming it's known that
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* all children are of a certain type.
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*
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* Unlike static_qobjectlist_cast(), not all of the objects must be of the same type. Objects that are of a different
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* type are not added to the list. Therefore it is guarantee the list will contain valid objects of the type you
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* specify (or an empty list if there are none).
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*/
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QList<T*> dynamic_qobjectlist_cast(const QObjectList& list) {
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QList<T*> new_list;
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new_list.reserve(list.size());
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for (int i=0;i<list.size();i++) {
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T* casted_obj = dynamic_cast<T*>(list.at(i));
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// Test cast (casted_obj will be nullptr if the dynamic_cast fails)
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if (casted_obj != nullptr) {
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new_list.append(casted_obj);
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}
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}
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return new_list;
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}
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#endif // QOBJECTLISTCAST_H
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