qgsattributetablemodel.h

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/***************************************************************************
  QgsAttributeTableModel.h - Models for attribute table
  -------------------
         date                 : Feb 2009
         copyright            : (C) 2009 by Vita Cizek
         email                : weetya (at) gmail.com
 
 ***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
 
#ifndef QGSATTRIBUTETABLEMODEL_H
#define QGSATTRIBUTETABLEMODEL_H
 
#include <QAbstractTableModel>
#include "qgis_sip.h"
#include <QModelIndex>
#include <QObject>
#include <QHash>
#include <QQueue>
#include <QMap>
 
#include "qgsconditionalstyle.h"
#include "qgsattributeeditorcontext.h"
#include "qgsvectorlayercache.h"
#include "qgis_gui.h"
 
class QgsMapCanvas;
class QgsMapLayerAction;
class QgsEditorWidgetFactory;
class QgsFieldFormatter;
 
class GUI_EXPORT QgsAttributeTableModel: public QAbstractTableModel
{
    Q_OBJECT
 
  public:
    enum Role
    {
      FeatureIdRole = Qt::UserRole, 
      FieldIndexRole,               
      UserRole,                     
      // Insert new values here, SortRole needs to be the last one
      SortRole,                     
    };
 
  public:
 
    QgsAttributeTableModel( QgsVectorLayerCache *layerCache, QObject *parent = nullptr );
 
    int rowCount( const QModelIndex &parent = QModelIndex() ) const override;
 
    int columnCount( const QModelIndex &parent = QModelIndex() ) const override;
 
    QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const override;
 
    QVariant data( const QModelIndex &index, int role ) const override;
 
    bool setData( const QModelIndex &index, const QVariant &value, int role = Qt::EditRole ) override;
 
    Qt::ItemFlags flags( const QModelIndex &index ) const override;
 
    void reload( const QModelIndex &index1, const QModelIndex &index2 );
 
    bool removeRows( int row, int count, const QModelIndex &parent = QModelIndex() ) override;
 
    inline void resetModel() { loadLayer(); }
 
    int idToRow( QgsFeatureId id ) const;
 
    QModelIndex idToIndex( QgsFeatureId id ) const;
 
    QModelIndexList idToIndexList( QgsFeatureId id ) const;
 
    int fieldIdx( int col ) const;
 
    int fieldCol( int idx ) const;
 
    QgsFeatureId rowToId( int row ) const;
 
    void swapRows( QgsFeatureId a, QgsFeatureId b );
 
    inline QgsVectorLayer *layer() const { return mLayerCache ? mLayerCache->layer() : nullptr; }
 
    inline QgsVectorLayerCache *layerCache() const { return mLayerCache; }
 
    void executeAction( QUuid action, const QModelIndex &idx ) const;
 
    void executeMapLayerAction( QgsMapLayerAction *action, const QModelIndex &idx ) const;
 
    QgsFeature feature( const QModelIndex &idx ) const;
 
    void prefetchColumnData( int column );
 
    void prefetchSortData( const QString &expression, unsigned long cacheIndex = 0 );
 
    QString sortCacheExpression( unsigned long cacheIndex = 0 ) const;
 
    void setRequest( const QgsFeatureRequest &request );
 
    // TODO QGIS 4: return copy instead of reference
 
    const QgsFeatureRequest &request() const;
 
    void setEditorContext( const QgsAttributeEditorContext &context ) { mEditorContext = context; }
 
    const QgsAttributeEditorContext &editorContext() const { return mEditorContext; }
 
    int extraColumns() const;
 
    void setExtraColumns( int extraColumns );
 
  public slots:
 
    virtual void loadLayer();
 
    void fieldConditionalStyleChanged( const QString &fieldName );
 
  signals:
 
    void modelChanged();
 
    void progress( int i, bool &cancel ) SIP_SKIP;
    void finished();
 
  private slots:
 
    virtual void updatedFields();
 
    virtual void editCommandEnded();
 
    virtual void attributeDeleted( int idx );
 
    virtual void attributeValueChanged( QgsFeatureId fid, int idx, const QVariant &value );
 
    virtual void featuresDeleted( const QgsFeatureIds &fids );
 
    virtual void featureAdded( QgsFeatureId fid );
 
    virtual void layerDeleted();
 
    virtual void fieldFormatterRemoved( QgsFieldFormatter *fieldFormatter );
 
  private:
    QgsVectorLayerCache *mLayerCache = nullptr;
    int mFieldCount = 0;
 
    mutable QgsFeature mFeat;
 
    QgsAttributeList mAttributes;
    QVector<QgsEditorWidgetFactory *> mWidgetFactories;
    QVector<QgsFieldFormatter *> mFieldFormatters;
    QVector<QVariant> mAttributeWidgetCaches;
    QVector<QVariantMap> mWidgetConfigs;
 
    QHash<QgsFeatureId, int> mIdRowMap;
    QHash<int, QgsFeatureId> mRowIdMap;
    mutable QHash<int, QList<QgsConditionalStyle> > mRowStylesMap;
 
    mutable QgsExpressionContext mExpressionContext;
 
    virtual void loadAttributes();
 
    virtual bool loadFeatureAtId( QgsFeatureId fid ) const;
 
    QgsFeatureRequest mFeatureRequest;
 
    struct SortCache
    {
      int sortFieldIndex;
      QgsExpression sortCacheExpression;
      QgsAttributeList sortCacheAttributes;
      QHash<QgsFeatureId, QVariant> sortCache;
    };
 
    std::vector<SortCache> mSortCaches;
 
    QgsAttributeEditorContext mEditorContext;
 
    int mExtraColumns = 0;
 
    bool mBulkEditCommandRunning = false;
 
    bool mResettingModel = false;
 
    void bulkEditCommandStarted();
 
    void bulkEditCommandEnded();
 
    QMap<QPair<QgsFeatureId, int>, QVariant> mAttributeValueChanges;
 
    friend class TestQgsAttributeTable;
 
};
 
 
#endif