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| ** Copyright (C) 2016 Ford Motor Company |
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| |
| #ifndef QQMLCHILDRENPRIVATE_H |
| #define QQMLCHILDRENPRIVATE_H |
| |
| #include <QAbstractState> |
| #include <QAbstractTransition> |
| #include <QStateMachine> |
| #include <QQmlInfo> |
| #include <QQmlListProperty> |
| |
| enum class ChildrenMode { |
| None = 0x0, |
| State = 0x1, |
| Transition = 0x2, |
| StateOrTransition = State | Transition |
| }; |
| |
| template<typename T> |
| static T *parentObject(QQmlListProperty<QObject> *prop) { return static_cast<T *>(prop->object); } |
| |
| template<class T, ChildrenMode Mode> |
| struct ParentHandler |
| { |
| static bool unparentItem(QQmlListProperty<QObject> *prop, QObject *oldItem); |
| static bool parentItem(QQmlListProperty<QObject> *prop, QObject *item); |
| }; |
| |
| template<class T> |
| struct ParentHandler<T, ChildrenMode::None> |
| { |
| static bool unparentItem(QQmlListProperty<QObject> *, QObject *) { return true; } |
| static bool parentItem(QQmlListProperty<QObject> *, QObject *) { return true; } |
| }; |
| |
| template<class T> |
| struct ParentHandler<T, ChildrenMode::State> |
| { |
| static bool parentItem(QQmlListProperty<QObject> *prop, QObject *item) |
| { |
| if (QAbstractState *state = qobject_cast<QAbstractState *>(item)) { |
| state->setParent(parentObject<T>(prop)); |
| return true; |
| } |
| return false; |
| } |
| |
| static bool unparentItem(QQmlListProperty<QObject> *, QObject *oldItem) |
| { |
| if (QAbstractState *state = qobject_cast<QAbstractState *>(oldItem)) { |
| state->setParent(nullptr); |
| return true; |
| } |
| return false; |
| } |
| }; |
| |
| template<class T> |
| struct ParentHandler<T, ChildrenMode::Transition> |
| { |
| static bool parentItem(QQmlListProperty<QObject> *prop, QObject *item) |
| { |
| if (QAbstractTransition *trans = qobject_cast<QAbstractTransition *>(item)) { |
| parentObject<T>(prop)->addTransition(trans); |
| return true; |
| } |
| return false; |
| } |
| |
| static bool unparentItem(QQmlListProperty<QObject> *prop, QObject *oldItem) |
| { |
| if (QAbstractTransition *trans = qobject_cast<QAbstractTransition *>(oldItem)) { |
| parentObject<T>(prop)->removeTransition(trans); |
| return true; |
| } |
| return false; |
| } |
| }; |
| |
| template<class T> |
| struct ParentHandler<T, ChildrenMode::StateOrTransition> |
| { |
| static bool parentItem(QQmlListProperty<QObject> *prop, QObject *oldItem) |
| { |
| return ParentHandler<T, ChildrenMode::State>::parentItem(prop, oldItem) |
| || ParentHandler<T, ChildrenMode::Transition>::parentItem(prop, oldItem); |
| } |
| |
| static bool unparentItem(QQmlListProperty<QObject> *prop, QObject *oldItem) |
| { |
| return ParentHandler<T, ChildrenMode::State>::unparentItem(prop, oldItem) |
| || ParentHandler<T, ChildrenMode::Transition>::unparentItem(prop, oldItem); |
| } |
| }; |
| |
| template <class T, ChildrenMode Mode> |
| class ChildrenPrivate |
| { |
| public: |
| static void append(QQmlListProperty<QObject> *prop, QObject *item) |
| { |
| Handler::parentItem(prop, item); |
| static_cast<Self *>(prop->data)->children.append(item); |
| emit parentObject<T>(prop)->childrenChanged(); |
| } |
| |
| static int count(QQmlListProperty<QObject> *prop) |
| { |
| return static_cast<Self *>(prop->data)->children.count(); |
| } |
| |
| static QObject *at(QQmlListProperty<QObject> *prop, int index) |
| { |
| return static_cast<Self *>(prop->data)->children.at(index); |
| } |
| |
| static void clear(QQmlListProperty<QObject> *prop) |
| { |
| auto &children = static_cast<Self *>(prop->data)->children; |
| for (QObject *oldItem : qAsConst(children)) |
| Handler::unparentItem(prop, oldItem); |
| |
| children.clear(); |
| emit parentObject<T>(prop)->childrenChanged(); |
| } |
| |
| static void replace(QQmlListProperty<QObject> *prop, int index, QObject *item) |
| { |
| auto &children = static_cast<Self *>(prop->data)->children; |
| |
| Handler::unparentItem(prop, children.at(index)); |
| Handler::parentItem(prop, item); |
| |
| children.replace(index, item); |
| emit parentObject<T>(prop)->childrenChanged(); |
| } |
| |
| static void removeLast(QQmlListProperty<QObject> *prop) |
| { |
| Handler::unparentItem(prop, static_cast<Self *>(prop->data)->children.takeLast()); |
| emit parentObject<T>(prop)->childrenChanged(); |
| } |
| |
| private: |
| using Self = ChildrenPrivate<T, Mode>; |
| using Handler = ParentHandler<T, Mode>; |
| |
| QList<QObject *> children; |
| }; |
| |
| #endif |