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qgsattributetablefiltermodel.h
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qgsattributetablefiltermodel.h
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/***************************************************************************
QgsAttributeTableFilterModel.h - Filter Model 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 QGSATTRIBUTETABLEFILTERMODEL_H
#define QGSATTRIBUTETABLEFILTERMODEL_H
#include <QSortFilterProxyModel>
#include <QModelIndex>
#include "qgsattributetablemodel.h"
#include "qgsfeaturemodel.h"
#include "qgis_gui.h"
class QgsVectorLayerCache;
class QgsMapCanvas;
class QItemSelectionModel;
/**
* \ingroup gui
* \class QgsAttributeTableFilterModel
*/
class GUI_EXPORT QgsAttributeTableFilterModel: public QSortFilterProxyModel, public QgsFeatureModel
{
Q_OBJECT
public:
/**
* The filter mode defines how the rows should be filtered.
*/
enum FilterMode
{
ShowAll, //!< Show all features
ShowSelected, //!< Show only selected features
ShowVisible, //!< Show only visible features (depends on the map canvas)
ShowFilteredList, //!< Show only features whose ids are on the filter list. {\see setFilteredFeatures}
ShowEdited //!< Show only features which have unsaved changes
};
Q_ENUM( FilterMode )
/**
* The type of a column.
*/
enum ColumnType
{
ColumnTypeField, //!< This column shows a field
ColumnTypeActionButton //!< This column shows action buttons
};
Q_ENUM( ColumnType )
/**
* The additional roles defined by this filter model.
* The values of these roles start just after the roles defined by
* QgsAttributeTableModel so they do not conflict.
*/
enum Role
{
TypeRole = QgsAttributeTableModel::UserRole //!< The type of a given column
};
/**
* Make sure, the master model is already loaded, so the selection will get synchronized.
*
* \param parent parent object (owner)
* \param sourceModel The QgsAttributeTableModel to use as source (mostly referred to as master model)
* \param canvas The mapCanvas. Used to identify the currently visible features.
*/
QgsAttributeTableFilterModel( QgsMapCanvas *canvas, QgsAttributeTableModel *sourceModel, QObject *parent SIP_TRANSFERTHIS = nullptr );
/**
* Set the attribute table model that backs this model
*
* \param sourceModel The model
*
* \since QGIS 2.0
*/
void setSourceModel( QgsAttributeTableModel *sourceModel );
/**
* Changes the sort order of the features. If set to TRUE, selected features
* will be sorted on top, regardless of the current sort column
*
* \param selectedOnTop Specify, if selected features should be sorted on top
*/
void setSelectedOnTop( bool selectedOnTop );
/**
* Returns if selected features are currently shown on top
*
* \returns TRUE if selected are shown on top
*/
bool selectedOnTop();
/**
* Specify a list of features, which the filter will accept.
* The filter mode will automatically be adjusted to show only these features (ShowFilteredList).
*
* \param ids The list of feature ids which will be accepted by the filter
*/
virtual void setFilteredFeatures( const QgsFeatureIds &ids );
/**
* Gets a list of currently filtered feature ids
*
* \returns A list of feature ids
*/
QgsFeatureIds filteredFeatures();
/**
* Set the filter mode the filter will use.
*
* \param filterMode Sets the current mode of the filter
*/
void setFilterMode( FilterMode filterMode );
/**
* The current filterModel
*/
FilterMode filterMode() { return mFilterMode; }
/**
* Returns the layer this filter acts on.
*
* \returns Abovementioned layer
*/
inline QgsVectorLayer *layer() const { return masterModel()->layer(); }
/**
* Returns the layerCache this filter acts on.
*
* \returns The layer cache
*/
inline QgsVectorLayerCache *layerCache() const { return masterModel()->layerCache(); }
/**
* Returns the table model this filter is using
*
* \returns the table model in quesion
*/
inline QgsAttributeTableModel *masterModel() const { return mTableModel; }
/**
* Returns the feature id for a given model index.
*
* \param row A model index of the row in question
*
* \returns The feature id of the feature visible in the provided row
*/
QgsFeatureId rowToId( const QModelIndex &row );
QModelIndex fidToIndex( QgsFeatureId fid ) override;
QModelIndexList fidToIndexList( QgsFeatureId fid );
inline QModelIndex mapToMaster( const QModelIndex &proxyIndex ) const { return mapToSource( proxyIndex ); }
inline QModelIndex mapFromMaster( const QModelIndex &sourceIndex ) const { return mapFromSource( sourceIndex ); }
QModelIndex mapToSource( const QModelIndex &proxyIndex ) const override;
QModelIndex mapFromSource( const QModelIndex &sourceIndex ) const override;
Qt::ItemFlags flags( const QModelIndex &index ) const override;
/**
* Sort by the given column using the given order.
* Prefetches all the data from the layer to speed up sorting.
*
* \param column The column which should be sorted
* \param order The order ( Qt::AscendingOrder or Qt::DescendingOrder )
*/
void sort( int column, Qt::SortOrder order = Qt::AscendingOrder ) override;
/**
* Sort by the given expression using the given order.
* Prefetches all the data from the layer to speed up sorting.
*
* \param expression The expression which should be used for sorting
* \param order The order ( Qt::AscendingOrder or Qt::DescendingOrder )
*/
void sort( const QString &expression, Qt::SortOrder order = Qt::AscendingOrder );
/**
* The expression which is used to sort the attribute table.
*/
QString sortExpression() const;
//! Returns the map canvas
QgsMapCanvas *mapCanvas() const { return mCanvas; }
QVariant data( const QModelIndex &index, int role ) const override;
QVariant headerData( int section, Qt::Orientation orientation, int role ) const override;
/**
* Gets the index of the first column that contains an action widget.
* Returns -1 if none is defined.
*/
int actionColumnIndex() const;
int columnCount( const QModelIndex &parent ) const override;
/**
* Set the attribute table configuration to control which fields are shown,
* in which order they are shown as well as if and where an action column
* is shown.
*/
void setAttributeTableConfig( const QgsAttributeTableConfig &config );
/**
* Set the \a expression and the \a context to be stored in case of the features
* need to be filtered again (like on filter or on main model data change).
*
* \since QGIS 3.10.3
*/
void setFilterExpression( const QgsExpression &expression, const QgsExpressionContext &context );
signals:
/**
* Emitted whenever the sort column is changed
* \param column The sort column
* \param order The sort order
*/
void sortColumnChanged( int column, Qt::SortOrder order );
protected:
/**
* Returns TRUE if the source row will be accepted
*
* \param sourceRow row from the source model
* \param sourceParent parent index in the source model
*/
bool filterAcceptsRow( int sourceRow, const QModelIndex &sourceParent ) const override;
/**
* Updates the list of currently visible features on the map canvas.
* Is called automatically when the filter mode is adjusted or the extents changed.
*/
void generateListOfVisibleFeatures();
/**
* Used by the sorting algorithm. Compares the two model indices. Will also consider the
* selection state of the feature in case selected features are to be shown on top.
*/
bool lessThan( const QModelIndex &left, const QModelIndex &right ) const override;
public slots:
/**
* Is called upon every change of the visible extents on the map canvas.
* When a change is signalled, the filter is updated and invalidated if needed.
*
* \deprecated since QGIS 3.10.3 - made private as reloadVisible()
*/
Q_DECL_DEPRECATED void extentsChanged();
/**
* Updates the filtered features in the filter model. It is called when the data of the
* main table or the filter expression changed.
*
* \since QGIS 3.10.3
*/
void filterFeatures();
private slots:
void selectionChanged();
void onColumnsChanged();
void reloadVisible();
void onAttributeValueChanged( QgsFeatureId fid, int idx, const QVariant &value );
void onGeometryChanged();
private:
QgsFeatureIds mFilteredFeatures;
QgsMapCanvas *mCanvas = nullptr;
FilterMode mFilterMode = FilterMode::ShowAll;
bool mSelectedOnTop = false;
QgsAttributeTableModel *mTableModel = nullptr;
QgsAttributeTableConfig mConfig;
QVector<int> mColumnMapping;
QgsExpression mFilterExpression;
QgsExpressionContext mFilterExpressionContext;
int mapColumnToSource( int column ) const;
int mapColumnFromSource( int column ) const;
};
#endif