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