QGIS API Documentation  3.17.0-Master (a035f434f4)
qgsgraduatedhistogramwidget.h
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1 /***************************************************************************
2  qgsgraduatedhistogramwidget.h
3  -----------------------------
4  begin : May 2015
5  copyright : (C) 2015 by Nyall Dawson
6  email : nyall dot dawson at gmail dot com
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 #ifndef QGSGRADUATEDHISTOGRAMWIDGET_H
18 #define QGSGRADUATEDHISTOGRAMWIDGET_H
19 
20 #include "qgshistogramwidget.h"
21 #include "qgis_sip.h"
22 #include "qgis_gui.h"
23 
24 class QwtPlotPicker;
25 class QgsGraduatedHistogramEventFilter;
26 
37 {
38  Q_OBJECT
39 
40  public:
41 
46  QgsGraduatedHistogramWidget( QWidget *parent SIP_TRANSFERTHIS = nullptr );
47 
53  void setRenderer( QgsGraduatedSymbolRenderer *renderer );
54 
55  signals:
56 
62  void rangesModified( bool rangesAdded );
63 
64  protected:
65 
66  void drawHistogram() override;
67 
68  private slots:
69 
70  void mousePress( double value );
71  void mouseRelease( double value );
72 
73  private:
74 
75  QgsGraduatedSymbolRenderer *mRenderer = nullptr;
76  QwtPlotPicker *mHistoPicker = nullptr;
77  QgsGraduatedHistogramEventFilter *mFilter = nullptr;
78  double mPressedValue = 0;
79 
80  void findClosestRange( double value, int &closestRangeIndex, int &pixelDistance ) const;
81 
82  QwtPlotHistogram *createPlotHistogram( const QString &title, const QColor &color ) const;
83 
84 };
85 
86 
87 #ifndef SIP_RUN
88 //
89 // NOTE:
90 // For private use by QgsGraduatedHistogramWidget only,
91 // not part of stable api or exposed to Python bindings
92 //
94 class GUI_EXPORT QgsGraduatedHistogramEventFilter: public QObject
95 {
96  Q_OBJECT
97 
98  public:
99 
100  QgsGraduatedHistogramEventFilter( QwtPlot *plot );
101 
102  bool eventFilter( QObject *object, QEvent *event ) override;
103 
104  signals:
105 
106  void mousePress( double );
107  void mouseRelease( double );
108 
109  private:
110 
111  QwtPlot *mPlot = nullptr;
112  double posToValue( QPointF point ) const;
113 };
115 #endif
116 
117 #endif //QGSGRADUATEDHISTOGRAMWIDGET_H
#define SIP_TRANSFERTHIS
Definition: qgis_sip.h:53
Graphical histogram for displaying distribution of field values and editing range breaks for a QgsGra...
virtual void drawHistogram()
Updates and redraws the histogram.
Graphical histogram for displaying distributions of field values.