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-rw-r--r--logic/resources/ResourceProxyModel.h36
1 files changed, 36 insertions, 0 deletions
diff --git a/logic/resources/ResourceProxyModel.h b/logic/resources/ResourceProxyModel.h
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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;
+};