libqgis-dev 1.7.4+1.7.5~20120320-1.1+b1 / usr / include / qgis / qgscategorizedsymbolrendererv2.h

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#ifndef QGSCATEGORIZEDSYMBOLRENDERERV2_H
#define QGSCATEGORIZEDSYMBOLRENDERERV2_H

#include "qgsrendererv2.h"

#include <QHash>

class QgsVectorColorRampV2;
class QgsVectorLayer;

/* \brief categorized renderer */
class CORE_EXPORT QgsRendererCategoryV2
{
  public:

    //! takes ownership of symbol
    QgsRendererCategoryV2( QVariant value, QgsSymbolV2* symbol, QString label );

    //! copy constructor
    QgsRendererCategoryV2( const QgsRendererCategoryV2& cat );

    ~QgsRendererCategoryV2();

    QVariant value() const;
    QgsSymbolV2* symbol() const;
    QString label() const;

    void setValue( const QVariant &value );
    void setSymbol( QgsSymbolV2* s );
    void setLabel( const QString &label );

    // debugging
    QString dump();

  protected:
    QVariant mValue;
    QgsSymbolV2* mSymbol;
    QString mLabel;
};

typedef QList<QgsRendererCategoryV2> QgsCategoryList;

class CORE_EXPORT QgsCategorizedSymbolRendererV2 : public QgsFeatureRendererV2
{
  public:

    QgsCategorizedSymbolRendererV2( QString attrName = QString(), QgsCategoryList categories = QgsCategoryList() );

    virtual ~QgsCategorizedSymbolRendererV2();

    virtual QgsSymbolV2* symbolForFeature( QgsFeature& feature );

    virtual void startRender( QgsRenderContext& context, const QgsVectorLayer *vlayer );

    virtual void stopRender( QgsRenderContext& context );

    virtual QList<QString> usedAttributes();

    virtual QString dump();

    virtual QgsFeatureRendererV2* clone();

    virtual QgsSymbolV2List symbols();

    const QgsCategoryList& categories() { return mCategories; }

    //! return index of category with specified value (-1 if not found)
    int categoryIndexForValue( QVariant val );

    bool updateCategoryValue( int catIndex, const QVariant &value );
    bool updateCategorySymbol( int catIndex, QgsSymbolV2* symbol );
    bool updateCategoryLabel( int catIndex, QString label );

    void addCategory( const QgsRendererCategoryV2 &category );
    bool deleteCategory( int catIndex );
    void deleteAllCategories();

    QString classAttribute() const { return mAttrName; }
    void setClassAttribute( QString attr ) { mAttrName = attr; }

    //! create renderer from XML element
    static QgsFeatureRendererV2* create( QDomElement& element );

    //! store renderer info to XML element
    virtual QDomElement save( QDomDocument& doc );

    //! return a list of symbology items for the legend
    virtual QgsLegendSymbologyList legendSymbologyItems( QSize iconSize );

    //! return a list of item text / symbol
    //! @note: this method was added in version 1.5
    virtual QgsLegendSymbolList legendSymbolItems();

    QgsSymbolV2* sourceSymbol();
    void setSourceSymbol( QgsSymbolV2* sym );

    QgsVectorColorRampV2* sourceColorRamp();
    void setSourceColorRamp( QgsVectorColorRampV2* ramp );

    //! @note added in 1.6
    void setRotationField( QString fieldName ) { mRotationField = fieldName; }
    //! @note added in 1.6
    QString rotationField() const { return mRotationField; }

    //! @note added in 1.6
    void setSizeScaleField( QString fieldName ) { mSizeScaleField = fieldName; }
    //! @note added in 1.6
    QString sizeScaleField() const { return mSizeScaleField; }

  protected:
    QString mAttrName;
    QgsCategoryList mCategories;
    QgsSymbolV2* mSourceSymbol;
    QgsVectorColorRampV2* mSourceColorRamp;
    QString mRotationField;
    QString mSizeScaleField;

    //! attribute index (derived from attribute name in startRender)
    int mAttrNum;
    int mRotationFieldIdx, mSizeScaleFieldIdx;

    //! hashtable for faster access to symbols
    QHash<QString, QgsSymbolV2*> mSymbolHash;

    //! temporary symbols, used for data-defined rotation and scaling
    QHash<QString, QgsSymbolV2*> mTempSymbols;

    void rebuildHash();

    QgsSymbolV2* symbolForValue( QVariant value );
};


#endif // QGSCATEGORIZEDSYMBOLRENDERERV2_H

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