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add sip-file for vector overlay
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git-svn-id: c8812cc2-4d05-0410-92ff-de0c093fc19c
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mhugent committed Apr 8, 2009
1 parent cd8ee51 commit ae26704
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56 changes: 56 additions & 0 deletions python/core/qgsvectoroverlay.sip
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class CORE_EXPORT QgsVectorOverlay
#include "qgsvectoroverlay.h"
QgsVectorOverlay( QgsVectorLayer* vl );
virtual ~QgsVectorOverlay();

/**Create the overlay objects contained in a view extent. Subclasses need to implement this method and assign width/height information to the overlay ovbjects*/

virtual void createOverlayObjects( const QgsRenderContext& renderContext ) = 0;

/**Remove the overlay objects and release their memory*/
void removeOverlayObjects();

/**Draw the overlay objects*/
virtual void drawOverlayObjects( QgsRenderContext& context ) const = 0;

/**Gives direct access to oberlay objects*/
QMap<int, QgsOverlayObject*>* overlayObjects() {return &mOverlayObjects;}

/**Describes the overlay type (e.g. "diagram" or "label")*/
virtual QString typeName() const = 0;

/**Set attribute indices necessary to fetch*/
void setAttributes( const QgsAttributeList& list ) {mAttributes = list;}

bool displayFlag() const {return mDisplayFlag;}

/**Display yes/no*/
void setDisplayFlag( bool flag ) {mDisplayFlag = flag;}

/**Restore from project file*/
virtual bool readXML( const QDomNode& overlayNode ) = 0;

/**Save to project file*/
virtual bool writeXML( QDomNode& layer_node, QDomDocument& doc ) const = 0;

/**Pointer to the vector layer for this overlay*/
QgsVectorLayer* mVectorLayer;

/**True if overlay should be displayed*/
bool mDisplayFlag;

/**A list with attribute indexes that are needed for overlay rendering*/
QgsAttributeList mAttributes;

/**Key: feature ids, value: the corresponding overlay objects. Normally, they are created for each redraw and deleted before the next redraw*/
QMap<int, QgsOverlayObject*> mOverlayObjects;

/**Position constraints that may be set to be persistent after redraws. Key is the feature id, value the map point
where the feature should be placed*/
QMap<int, QgsPoint> mPositionConstraints;

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