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3883547da4
Without this change, stats are calculated when users simply open the combo box to select a new field. With large datasets, it freezes QGIS for a long time, and the combo box end up never opening.
101 lines
3.3 KiB
C++
101 lines
3.3 KiB
C++
/***************************************************************************
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qgsstatisticalsummarydockwidget.h
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---------------------------------
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begin : May 2015
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copyright : (C) 2015 by Nyall Dawson
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email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#ifndef QGSSTATISTICALSUMMARYDOCKWIDGET_H
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#define QGSSTATISTICALSUMMARYDOCKWIDGET_H
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#include <QMap>
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#include "ui_qgsstatisticalsummarybase.h"
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#include "qgsstatisticalsummary.h"
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#include "qgsstringstatisticalsummary.h"
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#include "qgsdatetimestatisticalsummary.h"
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#include "qgsdockwidget.h"
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#include "qgis_app.h"
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class QMenu;
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class QgsBrowserModel;
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class QModelIndex;
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class QgsDockBrowserTreeView;
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class QgsLayerItem;
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class QgsDataItem;
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class QgsBrowserTreeFilterProxyModel;
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/**
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* A dock widget which displays a statistical summary of the values in a field or expression
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*/
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class APP_EXPORT QgsStatisticalSummaryDockWidget : public QgsDockWidget, private Ui::QgsStatisticalSummaryWidgetBase, private QgsExpressionContextGenerator
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{
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Q_OBJECT
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public:
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QgsStatisticalSummaryDockWidget( QWidget *parent = nullptr );
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/**
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* Returns the currently active layer for the widget
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* \since QGIS 2.12
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*/
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QgsVectorLayer *layer() const { return mLayer; }
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public slots:
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/**
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* Recalculates the displayed statistics
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*/
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void refreshStatistics();
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private slots:
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void layerChanged( QgsMapLayer *layer );
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void fieldChanged();
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void statActionTriggered( bool checked );
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void layersRemoved( const QStringList &layers );
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void layerSelectionChanged();
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private:
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//! Enumeration of supported statistics types
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enum DataType
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{
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Numeric, //!< Numeric fields: int, double, etc
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String, //!< String fields
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DateTime //!< Date and DateTime fields
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};
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QgsVectorLayer *mLayer = nullptr;
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QMap< int, QAction * > mStatsActions;
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static QList< QgsStatisticalSummary::Statistic > sDisplayStats;
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static QList< QgsStringStatisticalSummary::Statistic > sDisplayStringStats;
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static QList< QgsDateTimeStatisticalSummary::Statistic > sDisplayDateTimeStats;
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void updateNumericStatistics( bool selectedOnly );
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void updateStringStatistics( bool selectedOnly );
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void updateDateTimeStatistics( bool selectedOnly );
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void addRow( int row, const QString &name, const QString &value, bool showValue );
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QgsExpressionContext createExpressionContext() const override;
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void refreshStatisticsMenu();
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DataType fieldType( const QString &fieldName );
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QMenu *mStatisticsMenu = nullptr;
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DataType mFieldType;
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DataType mPreviousFieldType;
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QString mExpression;
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};
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#endif // QGSSTATISTICALSUMMARYDOCKWIDGET_H
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