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qgsrulebasedrendererv2.h
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1 /***************************************************************************
2  qgsrulebasedrendererv2.h - Rule-based renderer (symbology-ng)
3  ---------------------
4  begin : May 2010
5  copyright : (C) 2010 by Martin Dobias
6  email : wonder dot sk at gmail dot com
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSRULEBASEDRENDERERV2_H
17 #define QGSRULEBASEDRENDERERV2_H
18 
19 #include "qgsfield.h"
20 #include "qgsfeature.h"
21 #include "qgis.h"
22 
23 #include "qgsrendererv2.h"
24 
25 class QgsExpression;
26 
29 
34 class CORE_EXPORT QgsRuleBasedRendererV2 : public QgsFeatureRendererV2
35 {
36  public:
37 
38 
39  // TODO: use QVarLengthArray instead of QList
40 
41  enum FeatureFlags { FeatIsSelected = 1, FeatDrawMarkers = 2 };
42 
43  // feature for rendering: QgsFeature and some flags
45  {
46  FeatureToRender( QgsFeature& _f, int _flags ) : feat( _f ), flags( _flags ) {}
48  int flags; // selected and/or draw markers
49  };
50 
51  // rendering job: a feature to be rendered with a particular symbol
52  // (both f, symbol are _not_ owned by this class)
53  struct RenderJob
54  {
55  RenderJob( FeatureToRender& _ftr, QgsSymbolV2* _s ) : ftr( _ftr ), symbol( _s ) {}
58  };
59 
60  // render level: a list of jobs to be drawn at particular level
61  // (jobs are owned by this class)
62  struct RenderLevel
63  {
64  RenderLevel( int z ): zIndex( z ) {}
65  ~RenderLevel() { foreach ( RenderJob* j, jobs ) delete j; }
66  int zIndex;
68  };
69 
70  // rendering queue: a list of rendering levels
72 
73  class Rule;
74  typedef QList<Rule*> RuleList;
75 
84  class CORE_EXPORT Rule
85  {
86  public:
88  Rule( QgsSymbolV2* symbol, int scaleMinDenom = 0, int scaleMaxDenom = 0, QString filterExp = QString(),
89  QString label = QString(), QString description = QString(), bool elseRule = false );
90  ~Rule();
91  QString dump( int offset = 0 ) const;
92  QSet<QString> usedAttributes();
93  QgsSymbolV2List symbols( const QgsRenderContext& context = QgsRenderContext() );
95  QgsLegendSymbolList legendSymbolItems( double scaleDenominator = -1, QString rule = "" );
97  QgsLegendSymbolListV2 legendSymbolItemsV2( int currentLevel = -1 ) const;
98  bool isFilterOK( QgsFeature& f, QgsRenderContext *context = 0 ) const;
99  bool isScaleOK( double scale ) const;
100 
101  QgsSymbolV2* symbol() { return mSymbol; }
102  QString label() const { return mLabel; }
103  bool dependsOnScale() const { return mScaleMinDenom != 0 || mScaleMaxDenom != 0; }
104  int scaleMinDenom() const { return mScaleMinDenom; }
105  int scaleMaxDenom() const { return mScaleMaxDenom; }
106  QgsExpression* filter() const { return mFilter; }
107  QString filterExpression() const { return mFilterExp; }
108  QString description() const { return mDescription; }
110  bool checkState() const { return mCheckState; }
111 
114  QString ruleKey() const { return mRuleKey; }
117  void setRuleKey( const QString& key ) { mRuleKey = key; }
118 
120  void setSymbol( QgsSymbolV2* sym );
121  void setLabel( QString label ) { mLabel = label; }
122  void setScaleMinDenom( int scaleMinDenom ) { mScaleMinDenom = scaleMinDenom; }
123  void setScaleMaxDenom( int scaleMaxDenom ) { mScaleMaxDenom = scaleMaxDenom; }
124  void setFilterExpression( QString filterExp ) { mFilterExp = filterExp; initFilter(); }
125  void setDescription( QString description ) { mDescription = description; }
127  void setCheckState( bool state ) { mCheckState = state; }
128 
130  Rule* clone() const;
131 
132  void toSld( QDomDocument& doc, QDomElement &element, QgsStringMap props );
133  static Rule* createFromSld( QDomElement& element, QGis::GeometryType geomType );
134 
135  QDomElement save( QDomDocument& doc, QgsSymbolV2Map& symbolMap );
136 
138  Q_DECL_DEPRECATED bool startRender( QgsRenderContext& context, const QgsFields& fields );
140  bool startRender( QgsRenderContext& context, const QgsFields& fields, QString& filter );
142  QSet<int> collectZLevels();
145  void setNormZLevels( const QMap<int, int>& zLevelsToNormLevels );
146 
147  bool renderFeature( FeatureToRender& featToRender, QgsRenderContext& context, RenderQueue& renderQueue );
148 
150  bool willRenderFeature( QgsFeature& feat, QgsRenderContext* context = 0 );
151 
153  QgsSymbolV2List symbolsForFeature( QgsFeature& feat, QgsRenderContext* context = 0 );
154 
156  RuleList rulesForFeature( QgsFeature& feat, QgsRenderContext* context = 0 );
157 
158  void stopRender( QgsRenderContext& context );
159 
160  static Rule* create( QDomElement& ruleElem, QgsSymbolV2Map& symbolMap );
161 
162  RuleList& children() { return mChildren; }
163  RuleList descendants() const { RuleList l; foreach ( Rule *c, mChildren ) { l += c; l += c->descendants(); } return l; }
164  Rule* parent() { return mParent; }
165 
167  void appendChild( Rule* rule );
169  void insertChild( int i, Rule* rule );
171  void removeChild( Rule* rule );
173  void removeChildAt( int i );
175  void takeChild( Rule* rule );
177  Rule* takeChildAt( int i );
178 
181  Rule* findRuleByKey( QString key );
182 
183  void updateElseRules();
184 
185  void setIsElse( bool iselse ) { mElseRule = iselse; }
186  bool isElse() { return mElseRule; }
187 
188  protected:
189  void initFilter();
190 
191  Rule* mParent; // parent rule (NULL only for root rule)
193  int mScaleMinDenom, mScaleMaxDenom;
194  QString mFilterExp, mLabel, mDescription;
195  bool mElseRule;
196  RuleList mChildren;
197  RuleList mElseRules;
198  bool mCheckState; // whether it is enabled or not
199 
200  QString mRuleKey; // string used for unique identification of rule within renderer
201 
202  // temporary
204  // temporary while rendering
206  RuleList mActiveChildren;
207  };
208 
210 
211  static QgsFeatureRendererV2* create( QDomElement& element );
212 
216  QgsRuleBasedRendererV2( QgsSymbolV2* defaultSymbol );
217 
219 
221  virtual QgsSymbolV2* symbolForFeature( QgsFeature& feature, QgsRenderContext& context ) override;
222 
223  virtual bool renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer = -1, bool selected = false, bool drawVertexMarker = false ) override;
224 
225  virtual void startRender( QgsRenderContext& context, const QgsFields& fields ) override;
226 
227  virtual void stopRender( QgsRenderContext& context ) override;
228 
229  virtual QString filter() override;
230 
231  virtual QList<QString> usedAttributes() override;
232 
233  virtual QgsFeatureRendererV2* clone() const override;
234 
235  virtual void toSld( QDomDocument& doc, QDomElement &element ) const override;
236 
237  static QgsFeatureRendererV2* createFromSld( QDomElement& element, QGis::GeometryType geomType );
238 
239  virtual QgsSymbolV2List symbols( QgsRenderContext& context ) override;
240 
242  virtual QDomElement save( QDomDocument& doc ) override;
243 
245  virtual QgsLegendSymbologyList legendSymbologyItems( QSize iconSize ) override;
246 
249  virtual bool legendSymbolItemsCheckable() const override;
250 
253  virtual bool legendSymbolItemChecked( QString key ) override;
254 
257  virtual void checkLegendSymbolItem( QString key, bool state = true ) override;
258 
261  virtual QgsLegendSymbolList legendSymbolItems( double scaleDenominator = -1, QString rule = "" ) override;
262 
266  virtual QgsLegendSymbolListV2 legendSymbolItemsV2() const override;
267 
269  virtual QString dump() const override;
270 
273  virtual bool willRenderFeature( QgsFeature& feat, QgsRenderContext& context ) override;
274 
278  virtual QgsSymbolV2List symbolsForFeature( QgsFeature& feat, QgsRenderContext& context ) override;
279 
280  virtual QgsSymbolV2List originalSymbolsForFeature( QgsFeature& feat, QgsRenderContext& context ) override;
281 
283  virtual int capabilities() override { return MoreSymbolsPerFeature | Filter | ScaleDependent; }
284 
286 
287  Rule* rootRule() { return mRootRule; }
288 
290 
292  static void refineRuleCategories( Rule* initialRule, QgsCategorizedSymbolRendererV2* r );
294  static void refineRuleRanges( Rule* initialRule, QgsGraduatedSymbolRendererV2* r );
296  static void refineRuleScales( Rule* initialRule, QList<int> scales );
297 
301  static QgsRuleBasedRendererV2* convertFromRenderer( const QgsFeatureRendererV2 *renderer );
302 
304  static void convertToDataDefinedSymbology( QgsSymbolV2* symbol, QString sizeScaleField, QString rotationField = QString() );
305 
306  protected:
309 
310  // temporary
311  RenderQueue mRenderQueue;
313 
315 };
316 
317 #endif // QGSRULEBASEDRENDERERV2_H
Class for parsing and evaluation of expressions (formerly called "search strings").
Definition: qgsexpression.h:88
void setScaleMaxDenom(int scaleMaxDenom)
Container of fields for a vector layer.
Definition: qgsfield.h:177
GeometryType
Definition: qgis.h:155
RenderJob(FeatureToRender &_ftr, QgsSymbolV2 *_s)
The feature class encapsulates a single feature including its id, geometry and a list of field/values...
Definition: qgsfeature.h:162
virtual int capabilities() override
returns bitwise OR-ed capabilities of the renderer
This class keeps data about a rules for rule-based renderer.
void setRuleKey(const QString &key)
Override the assigned rule key (should be used just internally by rule-based renderer) ...
QgsExpression * filter() const
QString ruleKey() const
Unique rule identifier (for identification of rule within renderer)
Rule * mRootRule
the root node with hierarchical list of rules
Contains information about the context of a rendering operation.
When drawing a vector layer with rule-based renderer, it goes through the rules and draws features wi...
void setDescription(QString description)
QList< RenderLevel > RenderQueue
void setScaleMinDenom(int scaleMinDenom)
void setFilterExpression(QString filterExp)
QList< FeatureToRender > mCurrentFeatures