File indexing completed on 2024-05-12 17:08:30

 /*
  * SPDX-FileCopyrightText: 2020 Arjen Hiemstra <ahiemstra@heimr.nl>
  *
  * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
  */
 
 #pragma once
 
 #include <QIdentityProxyModel>
 #include <QQmlComponent>
 
 /**
  * Attached property object for ComponentCacheProxyModel
  */
 class ComponentCacheAttached : public QObject
 {
     Q_OBJECT
     Q_PROPERTY(QAbstractItemModel *model MEMBER m_model CONSTANT)
     Q_PROPERTY(int row MEMBER m_row CONSTANT)
     Q_PROPERTY(int column MEMBER m_column CONSTANT)
 
 public:
     explicit ComponentCacheAttached(QObject *parent = nullptr);
 
     QAbstractItemModel *m_model = nullptr;
     int m_row = -1;
     int m_column = -1;
 };
 
 /**
  * A proxy model that adds a cached component as an extra role.
  *
  * This proxy model will return an instance of \property component when data is
  * requested for the CachedComponentRole. If the instance does not yet exist,
  * it will be created.
  *
  * The referenced component can make use of the ComponentCacheAttached
  * attached property.
  *
  * This is mostly a helper for dealing with TableView and QSortFilterProxyModel,
  * which will cause some annoying reordering of cell delegates when sorting is
  * applied.
  */
 class ComponentCacheProxyModel : public QIdentityProxyModel
 {
     Q_OBJECT
     Q_PROPERTY(QQmlComponent *component READ component WRITE setComponent NOTIFY componentChanged)
 
 public:
     enum Roles {
         CachedComponentRole = Qt::UserRole + 88,
     };
     Q_ENUM(Roles)
 
     explicit ComponentCacheProxyModel(QObject *parent = nullptr);
     ~ComponentCacheProxyModel() override;
 
     QHash<int, QByteArray> roleNames() const override;
     QVariant data(const QModelIndex &proxyIndex, int role) const override;
     void setSourceModel(QAbstractItemModel *sourceModel) override;
 
     QQmlComponent *component() const;
     void setComponent(QQmlComponent *newComponent);
     Q_SIGNAL void componentChanged();
 
     Q_INVOKABLE void clear();
 
     static ComponentCacheAttached *qmlAttachedProperties(QObject *object)
     {
         return new ComponentCacheAttached(object);
     }
 
 private:
     void onRowsRemoved(const QModelIndex &parent, int start, int end);
     void onColumnsRemoved(const QModelIndex &parent, int start, int end);
     void createPendingInstance();
 
     QQmlComponent *m_component = nullptr;
     QHash<QPersistentModelIndex, QObject *> m_instances;
 
     mutable QVector<QPersistentModelIndex> m_pendingInstances;
 };
 
 QML_DECLARE_TYPEINFO(ComponentCacheProxyModel, QML_HAS_ATTACHED_PROPERTIES)