File indexing completed on 2024-05-12 05:36:09

 /*
  *   SPDX-FileCopyrightText: 2014 Aleix Pol Gonzalez <aleixpol@blue-systems.com>
  *
  *   SPDX-License-Identifier: LGPL-2.0-or-later
  */
 
 #pragma once
 
 #include <QAbstractListModel>
 #include <qqmlregistration.h>
 
 /**
  * @class PaginateModel
  *
  * This class can be used to create representations of only a chunk of a model.
  *
  * With this component it will be possible to create views that only show a page
  * of a model, instead of drawing all the elements in the model.
  */
 class PaginateModel : public QAbstractListModel
 {
     Q_OBJECT
     QML_ELEMENT
 
     /** Holds the number of elements that will fit in a page */
     Q_PROPERTY(int pageSize READ pageSize WRITE setPageSize NOTIFY pageSizeChanged)
 
     /** Tells what is the first row shown in the model */
     Q_PROPERTY(int firstItem READ firstItem WRITE setFirstItem NOTIFY firstItemChanged)
 
     /** The model we will be proxying */
     Q_PROPERTY(QAbstractItemModel *sourceModel READ sourceModel WRITE setSourceModel NOTIFY sourceModelChanged)
 
     /** Among the totality of elements, indicates the one we're currently offering */
     Q_PROPERTY(int currentPage READ currentPage NOTIFY firstItemChanged)
 
     /** Provides the number of pages available, given the sourceModel size */
     Q_PROPERTY(int pageCount READ pageCount NOTIFY pageCountChanged)
 
     /** If enabled, ensures that pageCount and pageSize are the same. */
     Q_PROPERTY(bool staticRowCount READ hasStaticRowCount WRITE setStaticRowCount NOTIFY staticRowCountChanged)
 
 public:
     explicit PaginateModel(QObject *object = nullptr);
     ~PaginateModel() override;
 
     int pageSize() const;
     void setPageSize(int count);
 
     int firstItem() const;
     void setFirstItem(int row);
 
     /**
      * @returns Last visible item.
      *
      * Convenience function
      */
     int lastItem() const;
 
     QAbstractItemModel *sourceModel() const;
     void setSourceModel(QAbstractItemModel *model);
 
     QModelIndex mapToSource(const QModelIndex &idx) const;
     QModelIndex mapFromSource(const QModelIndex &idx) const;
     int rowCount(const QModelIndex &parent = QModelIndex()) const override;
     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
 
     int currentPage() const;
     int pageCount() const;
     QHash<int, QByteArray> roleNames() const override;
 
     void setStaticRowCount(bool src);
     bool hasStaticRowCount() const;
 
     /** Display the first rows of the model */
     Q_SCRIPTABLE void firstPage();
 
     /** Display the rows right after the ones that are currently being served */
     Q_SCRIPTABLE void nextPage();
 
     /** Display the rows right before the ones that are currently being served */
     Q_SCRIPTABLE void previousPage();
 
     /** Display the last set of rows of the source model */
     Q_SCRIPTABLE void lastPage();
 
 private Q_SLOTS:
     void _k_sourceRowsAboutToBeInserted(const QModelIndex &parent, int start, int end);
     void _k_sourceRowsInserted(const QModelIndex &parent, int start, int end);
     void _k_sourceRowsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
     void _k_sourceRowsRemoved(const QModelIndex &parent, int start, int end);
     void _k_sourceRowsAboutToBeMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destParent, int dest);
     void _k_sourceRowsMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destParent, int dest);
 
     void _k_sourceColumnsAboutToBeInserted(const QModelIndex &parent, int start, int end);
     void _k_sourceColumnsInserted(const QModelIndex &parent, int start, int end);
     void _k_sourceColumnsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
     void _k_sourceColumnsRemoved(const QModelIndex &parent, int start, int end);
     void _k_sourceColumnsAboutToBeMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destParent, int dest);
     void _k_sourceColumnsMoved(const QModelIndex &sourceParent, int sourceStart, int sourceEnd, const QModelIndex &destParent, int dest);
 
     void _k_sourceDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles);
     void _k_sourceHeaderDataChanged(Qt::Orientation orientation, int first, int last);
 
     void _k_sourceModelAboutToBeReset();
     void _k_sourceModelReset();
 
 Q_SIGNALS:
     void pageSizeChanged();
     void firstItemChanged();
     void sourceModelChanged();
     void pageCountChanged();
     void staticRowCountChanged();
 
 private:
     bool canSizeChange() const;
     bool isIntervalValid(const QModelIndex &parent, int start, int end) const;
     int rowsByPageSize(int size) const;
 
     class PaginateModelPrivate;
     QScopedPointer<PaginateModelPrivate> d;
 };