Code shuffle, to make QgsLayoutContext aware of parent QgsLayout

python/core/layout/qgslayoutcontext.sip

@@ -32,7 +32,10 @@ class QgsLayoutContext : QObject
     typedef QFlags<QgsLayoutContext::Flag> Flags;
 
 
-    QgsLayoutContext();
+    QgsLayoutContext( QgsLayout *layout /TransferThis/ );
+%Docstring
+Constructor for QgsLayoutContext.
+%End
 
     void setFlags( const QgsLayoutContext::Flags flags );
 %Docstring

src/core/layout/qgslayout.cpp

@@ -30,6 +30,7 @@
 
 QgsLayout::QgsLayout( QgsProject *project )
   : mProject( project )
+  , mContext( new QgsLayoutContext( this ) )
   , mSnapper( QgsLayoutSnapper( this ) )
   , mGridSettings( this )
   , mPageCollection( new QgsLayoutPageCollection( this ) )
@@ -281,32 +282,42 @@ QgsLayoutItem *QgsLayout::layoutItemAt( QPointF position, const QgsLayoutItem *b
 
 double QgsLayout::convertToLayoutUnits( const QgsLayoutMeasurement &measurement ) const
 {
-  return mContext.measurementConverter().convert( measurement, mUnits ).length();
+  return mContext->measurementConverter().convert( measurement, mUnits ).length();
 }
 
 QSizeF QgsLayout::convertToLayoutUnits( const QgsLayoutSize &size ) const
 {
-  return mContext.measurementConverter().convert( size, mUnits ).toQSizeF();
+  return mContext->measurementConverter().convert( size, mUnits ).toQSizeF();
 }
 
 QPointF QgsLayout::convertToLayoutUnits( const QgsLayoutPoint &point ) const
 {
-  return mContext.measurementConverter().convert( point, mUnits ).toQPointF();
+  return mContext->measurementConverter().convert( point, mUnits ).toQPointF();
 }
 
 QgsLayoutMeasurement QgsLayout::convertFromLayoutUnits( const double length, const QgsUnitTypes::LayoutUnit unit ) const
 {
-  return mContext.measurementConverter().convert( QgsLayoutMeasurement( length, mUnits ), unit );
+  return mContext->measurementConverter().convert( QgsLayoutMeasurement( length, mUnits ), unit );
 }
 
 QgsLayoutSize QgsLayout::convertFromLayoutUnits( const QSizeF &size, const QgsUnitTypes::LayoutUnit unit ) const
 {
-  return mContext.measurementConverter().convert( QgsLayoutSize( size.width(), size.height(), mUnits ), unit );
+  return mContext->measurementConverter().convert( QgsLayoutSize( size.width(), size.height(), mUnits ), unit );
 }
 
 QgsLayoutPoint QgsLayout::convertFromLayoutUnits( const QPointF &point, const QgsUnitTypes::LayoutUnit unit ) const
 {
-  return mContext.measurementConverter().convert( QgsLayoutPoint( point.x(), point.y(), mUnits ), unit );
+  return mContext->measurementConverter().convert( QgsLayoutPoint( point.x(), point.y(), mUnits ), unit );
+}
+
+QgsLayoutContext &QgsLayout::context()
+{
+  return *mContext;
+}
+
+const QgsLayoutContext &QgsLayout::context() const
+{
+  return *mContext;
 }
 
 QgsLayoutGuideCollection &QgsLayout::guides()
@@ -709,7 +720,7 @@ void QgsLayout::writeXmlLayoutSettings( QDomElement &element, QDomDocument &docu
   element.setAttribute( QStringLiteral( "name" ), mName );
   element.setAttribute( QStringLiteral( "units" ), QgsUnitTypes::encodeUnit( mUnits ) );
   element.setAttribute( QStringLiteral( "worldFileMap" ), mWorldFileMapId );
-  element.setAttribute( QStringLiteral( "printResolution" ), mContext.dpi() );
+  element.setAttribute( QStringLiteral( "printResolution" ), mContext->dpi() );
 }
 
 QDomElement QgsLayout::writeXml( QDomDocument &document, const QgsReadWriteContext &context ) const
@@ -753,7 +764,7 @@ bool QgsLayout::readXmlLayoutSettings( const QDomElement &layoutElement, const Q
   setName( layoutElement.attribute( QStringLiteral( "name" ) ) );
   setUnits( QgsUnitTypes::decodeLayoutUnit( layoutElement.attribute( QStringLiteral( "units" ) ) ) );
   mWorldFileMapId = layoutElement.attribute( QStringLiteral( "worldFileMap" ) );
-  mContext.setDpi( layoutElement.attribute( QStringLiteral( "printResolution" ), "300" ).toDouble() );
+  mContext->setDpi( layoutElement.attribute( QStringLiteral( "printResolution" ), "300" ).toDouble() );
   emit changed();
 
   return true;

src/core/layout/qgslayout.h

@@ -18,7 +18,6 @@
 
 #include "qgis_core.h"
 #include <QGraphicsScene>
-#include "qgslayoutcontext.h"
 #include "qgslayoutsnapper.h"
 #include "qgsexpressioncontextgenerator.h"
 #include "qgslayoutgridsettings.h"
@@ -30,6 +29,7 @@ class QgsLayoutModel;
 class QgsLayoutMultiFrame;
 class QgsLayoutPageCollection;
 class QgsLayoutUndoStack;
+class QgsLayoutContext;
 
 /**
  * \ingroup core
@@ -318,13 +318,13 @@ class CORE_EXPORT QgsLayout : public QGraphicsScene, public QgsExpressionContext
      * Returns a reference to the layout's context, which stores information relating to the
      * current context and rendering settings for the layout.
      */
-    QgsLayoutContext &context() { return mContext; }
+    QgsLayoutContext &context();
 
     /**
      * Returns a reference to the layout's context, which stores information relating to the
      * current context and rendering settings for the layout.
      */
-    SIP_SKIP const QgsLayoutContext &context() const { return mContext; }
+    SIP_SKIP const QgsLayoutContext &context() const;
 
     /**
      * Returns a reference to the layout's snapper, which stores handles layout snap grids and lines
@@ -629,7 +629,7 @@ class CORE_EXPORT QgsLayout : public QGraphicsScene, public QgsExpressionContext
     QgsObjectCustomProperties mCustomProperties;
 
     QgsUnitTypes::LayoutUnit mUnits = QgsUnitTypes::LayoutMillimeters;
-    QgsLayoutContext mContext;
+    QgsLayoutContext *mContext = nullptr;
     QgsLayoutSnapper mSnapper;
     QgsLayoutGridSettings mGridSettings;
 

src/core/layout/qgslayoutcontext.cpp

@@ -16,10 +16,12 @@
 
 #include "qgslayoutcontext.h"
 #include "qgsfeature.h"
+#include "qgslayout.h"
 
-
-QgsLayoutContext::QgsLayoutContext()
-  : mFlags( FlagAntialiasing | FlagUseAdvancedEffects )
+QgsLayoutContext::QgsLayoutContext( QgsLayout *layout )
+  : QObject( layout )
+  , mFlags( FlagAntialiasing | FlagUseAdvancedEffects )
+  , mLayout( layout )
 {}
 
 void QgsLayoutContext::setFlags( const QgsLayoutContext::Flags flags )

src/core/layout/qgslayoutcontext.h

@@ -49,7 +49,10 @@ class CORE_EXPORT QgsLayoutContext : public QObject
     };
     Q_DECLARE_FLAGS( Flags, Flag )
 
-    QgsLayoutContext();
+    /**
+     * Constructor for QgsLayoutContext.
+     */
+    QgsLayoutContext( QgsLayout *layout SIP_TRANSFERTHIS );
 
     /**
      * Sets the combination of \a flags that will be used for rendering the layout.
@@ -245,6 +248,8 @@ class CORE_EXPORT QgsLayoutContext : public QObject
 
     Flags mFlags = nullptr;
 
+    QgsLayout *mLayout = nullptr;
+
     int mCurrentExportLayer = -1;
 
     QgsFeature mFeature;

tests/src/core/testqgslayoutcontext.cpp

@@ -75,14 +75,14 @@ void TestQgsLayoutContext::cleanup()
 
 void TestQgsLayoutContext::creation()
 {
-  QgsLayoutContext *context = new QgsLayoutContext();
+  QgsLayoutContext *context = new QgsLayoutContext( nullptr );
   QVERIFY( context );
   delete context;
 }
 
 void TestQgsLayoutContext::flags()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
   QSignalSpy spyFlagsChanged( &context, &QgsLayoutContext::flagsChanged );
 
   //test getting and setting flags
@@ -108,7 +108,7 @@ void TestQgsLayoutContext::flags()
 
 void TestQgsLayoutContext::feature()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
 
   //test removing feature
   context.setFeature( QgsFeature() );
@@ -124,7 +124,7 @@ void TestQgsLayoutContext::feature()
 
 void TestQgsLayoutContext::layer()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
 
   //test clearing layer
   context.setLayer( nullptr );
@@ -144,7 +144,7 @@ void TestQgsLayoutContext::layer()
 
 void TestQgsLayoutContext::dpi()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
 
   QSignalSpy spyDpiChanged( &context, &QgsLayoutContext::dpiChanged );
   context.setDpi( 600 );
@@ -160,7 +160,7 @@ void TestQgsLayoutContext::dpi()
 
 void TestQgsLayoutContext::renderContextFlags()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
   context.setFlags( 0 );
   QgsRenderContext::Flags flags = context.renderContextFlags();
   QVERIFY( !( flags & QgsRenderContext::Antialiasing ) );
@@ -182,7 +182,7 @@ void TestQgsLayoutContext::renderContextFlags()
 
 void TestQgsLayoutContext::boundingBoxes()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
   context.setBoundingBoxesVisible( false );
   QVERIFY( !context.boundingBoxesVisible() );
   context.setBoundingBoxesVisible( true );
@@ -191,7 +191,7 @@ void TestQgsLayoutContext::boundingBoxes()
 
 void TestQgsLayoutContext::exportLayer()
 {
-  QgsLayoutContext context;
+  QgsLayoutContext context( nullptr );
   // must default to -1
   QCOMPARE( context.currentExportLayer(), -1 );
   context.setCurrentExportLayer( 1 );