Write snap settings for a layer in a convenient way

Author: mhugent

python/core/qgsproject.sip

@@ -240,7 +240,7 @@ public:
       @note added in 1.4 */
     void setBadLayerHandler( QgsProjectBadLayerHandler* handler );
 
-    void setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType type, QgsTolerance::UnitType, double tolerance );
+    void setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType type, QgsTolerance::UnitType unit, double tolerance, bool avoidIntersection );
 
     bool snapSettingsForLayer( const QString& layerId, bool& enabled /Out/, QgsSnapper::SnappingType& type /Out/, QgsTolerance::UnitType& units /Out/, double& tolerance /Out/,
                                bool& avoidIntersection /Out/ );

src/core/qgsproject.cpp

@@ -1621,9 +1621,60 @@ bool QgsProject::createEmbeddedLayer( const QString& layerId, const QString& pro
   return false;
 }
 
-void QgsProject::setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType  type, QgsTolerance::UnitType, double tolerance )
+void QgsProject::setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType  type, QgsTolerance::UnitType unit, double tolerance, bool avoidIntersection )
 {
-  //soon...
+  QStringList layerIdList, enabledList, snapTypeList, toleranceUnitList, toleranceList, avoidIntersectionList;
+  snapSettings( layerIdList, enabledList, snapTypeList, toleranceUnitList, toleranceList, avoidIntersectionList );
+  int idx = layerIdList.indexOf( layerId );
+  if ( idx != -1 )
+  {
+    layerIdList.removeAt( idx );
+    enabledList.removeAt( idx );
+    snapTypeList.removeAt( idx );
+    toleranceUnitList.removeAt( idx );
+    toleranceList.removeAt( idx );
+    avoidIntersectionList.removeOne( layerId );
+  }
+
+  layerIdList.append( layerId );
+
+  //enabled
+  enabledList.append( enabled ? "enabled" : "disabled" );
+
+  //snap type
+  QString typeString;
+  if ( type == QgsSnapper::SnapToSegment )
+  {
+    typeString = "to_segment";
+  }
+  else if ( type == QgsSnapper::SnapToVertexAndSegment )
+  {
+    typeString = "to_vertex_and_segment";
+  }
+  else
+  {
+    typeString = "to_vertex";
+  }
+  snapTypeList.append( typeString );
+
+  //units
+  toleranceUnitList.append( unit == QgsTolerance::Pixels ? "1" : "0" );
+
+  //tolerance
+  toleranceList.append( QString::number( tolerance ) );
+
+  //avoid intersection
+  if ( avoidIntersection )
+  {
+    avoidIntersectionList.append( layerId );
+  }
+
+  writeEntry( "Digitizing", "/LayerSnappingList", layerIdList );
+  writeEntry( "Digitizing", "/LayerSnappingEnabledList", enabledList );
+  writeEntry( "Digitizing", "/LayerSnappingToleranceList", toleranceList );
+  writeEntry( "Digitizing", "/LayerSnappingToleranceUnitList", toleranceUnitList );
+  writeEntry( "Digitizing", "/LayerSnapToList", snapTypeList );
+  writeEntry( "Digitizing", "/AvoidIntersectionsList", avoidIntersectionList );
 }
 
 bool QgsProject::snapSettingsForLayer( const QString& layerId, bool& enabled, QgsSnapper::SnappingType &type, QgsTolerance::UnitType& units, double& tolerance,

src/core/qgsproject.h

@@ -291,7 +291,8 @@ class CORE_EXPORT QgsProject : public QObject
                               QList< QPair< QgsVectorLayer*, QDomElement > >& vectorLayerList, bool saveFlag = true );
 
     //convenience interface for querying / modifying the project snap settings per layer
-    void setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType type, QgsTolerance::UnitType, double tolerance );
+    void setSnapSettingsForLayer( const QString& layerId, bool enabled, QgsSnapper::SnappingType type, QgsTolerance::UnitType unit, double tolerance,
+                                  bool avoidIntersection );
 
     bool snapSettingsForLayer( const QString& layerId, bool& enabled, QgsSnapper::SnappingType& type, QgsTolerance::UnitType& units, double& tolerance,
                                bool& avoidIntersection );