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0016ab6230
approach of automatically fetching the values on demand was resulting in graphical corruption to the parent tab widget.
139 lines
4.1 KiB
Plaintext
139 lines
4.1 KiB
Plaintext
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/** \ingroup gui
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* \class QgsHistogramWidget
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* \brief Graphical histogram for displaying distributions of field values.
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*
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* \note Added in version 2.9
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*/
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class QgsHistogramWidget : QWidget
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{
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%TypeHeaderCode
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#include <qgshistogramwidget.h>
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%End
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public:
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/** QgsHistogramWidget constructor. If layer and fieldOrExp are specified then the histogram
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* will be initially populated with the corresponding values.
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* @param parent parent widget
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* @param layer source vector layer
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* @param fieldOrExp field name or expression string
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*/
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QgsHistogramWidget( QWidget *parent /TransferThis/ = 0, QgsVectorLayer* layer = 0, const QString& fieldOrExp = QString() );
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~QgsHistogramWidget();
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/** Returns the layer currently associated with the widget.
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* @see setLayer
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* @see sourceFieldExp
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*/
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QgsVectorLayer* layer();
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/** Returns the source field name or expression used to calculate values displayed
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* in the histogram.
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* @see setSourceFieldExp
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* @see layer
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*/
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QString sourceFieldExp() const;
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/** Sets the pen to use when drawing histogram bars. If set to Qt::NoPen then the
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* pen will be automatically calculated. If ranges have been set using @link setGraduatedRanges @endlink
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* then the pen and brush will have no effect.
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* @param pen histogram pen
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* @see pen
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* @see setBrush
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*/
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void setPen( const QPen& pen );
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/** Returns the pen used when drawing histogram bars.
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* @see setPen
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* @see brush
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*/
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QPen pen() const;
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/** Sets the brush used for drawing histogram bars. If ranges have been set using @link setGraduatedRanges @endlink
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* then the pen and brush will have no effect.
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* @param brush histogram brush
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* @see brush
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* @see setPen
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*/
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void setBrush( const QBrush& brush );
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/** Returns the brush used when drawing histogram bars.
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* @see setBrush
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* @see pen
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*/
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QBrush brush() const;
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/** Sets the graduated ranges associated with the histogram. If set, the ranges will be used to colour the histogram
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* bars and for showing vertical dividers at the histogram breaks.
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* @param ranges graduated range list
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*/
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void setGraduatedRanges( const QgsRangeList& ranges );
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/** Returns the graduated ranges associated with the histogram. If set, the ranges will be used to colour the histogram
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* bars and for showing vertical dividers at the histogram breaks.
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* @returns graduated range list
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* @see setGraduatedRanges
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*/
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QgsRangeList graduatedRanges() const;
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/** Returns the title for the histogram's x-axis.
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* @see setXAxisTitle
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* @see yAxisTitle
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*/
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QString xAxisTitle() const;
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/** Sets the title for the histogram's x-axis.
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* @param title x-axis title, or empty string to remove title
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* @see xAxisTitle
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* @see setYAxisTitle
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*/
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void setXAxisTitle( const QString& title );
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/** Returns the title for the histogram's y-axis.
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* @see setYAxisTitle
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* @see xAxisTitle
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*/
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QString yAxisTitle() const;
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/** Sets the title for the histogram's y-axis.
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* @param title y-axis title, or empty string to remove title
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* @see yAxisTitle
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* @see setXAxisTitle
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*/
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void setYAxisTitle( const QString& title );
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public slots:
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/** Refreshes the values for the histogram by fetching them from the layer.
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*/
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void refreshValues();
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/** Redraws the histogram. Calling this slot does not update the values
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* for the histogram, use @link refreshValues @endlink to do this.
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*/
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void refresh();
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/** Sets the vector layer associated with the histogram.
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* @param layer source vector layer
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* @see setSourceFieldExp
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*/
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void setLayer( QgsVectorLayer* layer );
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/** Sets the source field or expression to use for values in the histogram.
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* @param fieldOrExp field name or expression string
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* @see setLayer
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*/
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void setSourceFieldExp( const QString& fieldOrExp );
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protected:
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/** Updates and redraws the histogram.
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*/
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virtual void drawHistogram();
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virtual void paintEvent( QPaintEvent * event );
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};
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