Add measurement converter and dpi to layout context

Author: nyalldawson

python/core/layout/qgslayoutcontext.sip

@@ -97,6 +97,28 @@ class QgsLayoutContext
 .. seealso:: layer()
 %End
 
+    void setDpi( double dpi );
+%Docstring
+ Sets the ``dpi`` for outputting the layout. This also sets the
+ corresponding DPI for the context's measurementConverter().
+.. seealso:: dpi()
+%End
+
+    double dpi() const;
+%Docstring
+ Returns the ``dpi`` for outputting the layout.
+.. seealso:: setDpi()
+ :rtype: float
+%End
+
+
+    QgsLayoutMeasurementConverter &measurementConverter();
+%Docstring
+ Returns the layout measurement converter to be used in the layout. This converter is used
+ for translating between other measurement units and the layout's native unit.
+ :rtype: QgsLayoutMeasurementConverter
+%End
+
 };
 
 

src/core/CMakeLists.txt

@@ -672,7 +672,6 @@ SET(QGIS_CORE_MOC_HDRS
   gps/qgsgpsdconnection.h
 
   layout/qgslayout.h
-  layout/qgslayoutcontext.h
   layout/qgslayoutitem.h
   layout/qgslayoutitemregistry.h
   layout/qgslayoutobject.h
@@ -918,7 +917,7 @@ SET(QGIS_CORE_HDRS
   composer/qgscomposertexttable.h
   composer/qgspaperitem.h
 
-  layout/qgslayout.h
+  layout/qgslayoutcontext.h
   layout/qgslayoutmeasurement.h
   layout/qgslayoutmeasurementconverter.h
   layout/qgspagesizeregistry.h

src/core/layout/qgslayoutcontext.cpp

@@ -54,3 +54,13 @@ void QgsLayoutContext::setLayer( QgsVectorLayer *layer )
 {
   mLayer = layer;
 }
+
+void QgsLayoutContext::setDpi( double dpi )
+{
+  mMeasurementConverter.setDpi( dpi );
+}
+
+double QgsLayoutContext::dpi() const
+{
+  return mMeasurementConverter.dpi();
+}

src/core/layout/qgslayoutcontext.h

@@ -19,6 +19,7 @@
 #include "qgis_core.h"
 #include "qgsfeature.h"
 #include "qgsvectorlayer.h"
+#include "qgslayoutmeasurementconverter.h"
 #include <QtGlobal>
 
 class QgsFeature;
@@ -108,13 +109,40 @@ class CORE_EXPORT QgsLayoutContext
      */
     void setLayer( QgsVectorLayer *layer );
 
+    /**
+     * Sets the \a dpi for outputting the layout. This also sets the
+     * corresponding DPI for the context's measurementConverter().
+     * \see dpi()
+     */
+    void setDpi( double dpi );
+
+    /**
+     * Returns the \a dpi for outputting the layout.
+     * \see setDpi()
+     */
+    double dpi() const;
+
+    /**
+     * Returns the layout measurement converter to be used in the layout. This converter is used
+     * for translating between other measurement units and the layout's native unit.
+     */
+    SIP_SKIP const QgsLayoutMeasurementConverter &measurementConverter() const { return mMeasurementConverter; }
+
+    /**
+     * Returns the layout measurement converter to be used in the layout. This converter is used
+     * for translating between other measurement units and the layout's native unit.
+     */
+    QgsLayoutMeasurementConverter &measurementConverter() { return mMeasurementConverter; }
+
   private:
 
     Flags mFlags = 0;
 
     QgsFeature mFeature;
     QPointer< QgsVectorLayer > mLayer;
 
+    QgsLayoutMeasurementConverter mMeasurementConverter;
+
 };
 
 #endif //QGSLAYOUTCONTEXT_H

tests/src/core/testqgslayoutcontext.cpp

@@ -35,6 +35,7 @@ class TestQgsLayoutContext: public QObject
     void flags(); //test QgsLayout flags
     void feature();
     void layer();
+    void dpi();
 
   private:
     QString mReport;
@@ -126,5 +127,13 @@ void TestQgsLayoutContext::layer()
   delete layer;
 }
 
+void TestQgsLayoutContext::dpi()
+{
+  QgsLayoutContext context;
+  context.setDpi( 600 );
+  QCOMPARE( context.dpi(), 600.0 );
+  QCOMPARE( context.measurementConverter().dpi(), 600.0 );
+}
+
 QGSTEST_MAIN( TestQgsLayoutContext )
 #include "testqgslayoutcontext.moc"