38 lines
1.2 KiB
C++
38 lines
1.2 KiB
C++
#pragma once
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#include <QIdentityProxyModel>
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#include <memory>
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/// Convenience proxy model that transforms resource identifiers (strings) for Qt::DecorationRole into other types.
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class ResourceProxyModel : public QIdentityProxyModel
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{
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Q_OBJECT
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public:
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// resultTypeId is found using qMetaTypeId<T>()
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explicit ResourceProxyModel(const int resultTypeId, QObject *parent = nullptr);
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enum
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{
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// provide this role from your model if you want to show a placeholder
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PlaceholderRole = Qt::UserRole + 0xabc // some random offset to not collide with other stuff
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};
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QVariant data(const QModelIndex &proxyIndex, int role) const override;
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void setSourceModel(QAbstractItemModel *model) override;
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/// Helper function, usage: m_view->setModel(ResourceProxyModel::mixin<QIcon>(m_model));
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template <typename T>
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static QAbstractItemModel *mixin(QAbstractItemModel *model)
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{
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ResourceProxyModel *proxy = new ResourceProxyModel(qMetaTypeId<T>(), model);
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proxy->setSourceModel(model);
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return proxy;
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}
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private:
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// mutable because it needs to be available from the const data()
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mutable QMap<QPersistentModelIndex, std::shared_ptr<class Resource>> m_resources;
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const int m_resultTypeId;
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};
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