Hide guides from layout exports

python/core/layout/qgslayoutguidecollection.sip

@@ -206,6 +206,11 @@ Resets all other pages' guides to match the guides from the specified ``sourcePa
     void update();
 %Docstring
 Updates the position (and visibility) of all guide line items.
+%End
+
+    QList< QgsLayoutGuide * > guides();
+%Docstring
+Returns a list of all guides contained in the collection.
 %End
 
     QList< QgsLayoutGuide * > guides( Qt::Orientation orientation, int page = -1 );

src/core/layout/qgslayoutexporter.cpp

@@ -20,6 +20,7 @@
 #include "qgslayoutpagecollection.h"
 #include "qgsogrutils.h"
 #include "qgspaintenginehack.h"
+#include "qgslayoutguidecollection.h"
 #include <QImageWriter>
 #include <QSize>
 
@@ -48,6 +49,34 @@ class LayoutContextPreviewSettingRestorer
     bool mPreviousSetting = false;
 };
 
+class LayoutGuideHider
+{
+  public:
+
+    LayoutGuideHider( QgsLayout *layout )
+      : mLayout( layout )
+    {
+      const QList< QgsLayoutGuide * > guides = mLayout->guides().guides();
+      for ( QgsLayoutGuide *guide : guides )
+      {
+        mPrevVisibility.insert( guide, guide->item()->isVisible() );
+        guide->item()->setVisible( false );
+      }
+    }
+
+    ~LayoutGuideHider()
+    {
+      for ( auto it = mPrevVisibility.constBegin(); it != mPrevVisibility.constEnd(); ++it )
+      {
+        it.key()->item()->setVisible( it.value() );
+      }
+    }
+
+  private:
+    QgsLayout *mLayout = nullptr;
+    QHash< QgsLayoutGuide *, bool > mPrevVisibility;
+};
+
 ///@endcond PRIVATE
 
 QgsLayoutExporter::QgsLayoutExporter( QgsLayout *layout )
@@ -150,18 +179,12 @@ void QgsLayoutExporter::renderRegion( QPainter *painter, const QRectF &region )
   ( void )cacheRestorer;
   LayoutContextPreviewSettingRestorer restorer( mLayout );
   ( void )restorer;
-
-#if 0 //TODO
-  setSnapLinesVisible( false );
-#endif
+  LayoutGuideHider guideHider( mLayout );
+  ( void ) guideHider;
 
   painter->setRenderHint( QPainter::Antialiasing, mLayout->context().flags() & QgsLayoutContext::FlagAntialiasing );
 
   mLayout->render( painter, QRectF( 0, 0, paintDevice->width(), paintDevice->height() ), region );
-
-#if 0 // TODO
-  setSnapLinesVisible( true );
-#endif
 }
 
 QImage QgsLayoutExporter::renderRegionToImage( const QRectF &region, QSize imageSize, double dpi ) const

src/core/layout/qgslayoutguidecollection.cpp

@@ -467,6 +467,11 @@ void QgsLayoutGuideCollection::update()
   }
 }
 
+QList<QgsLayoutGuide *> QgsLayoutGuideCollection::guides()
+{
+  return mGuides;
+}
+
 QList<QgsLayoutGuide *> QgsLayoutGuideCollection::guides( Qt::Orientation orientation, int page )
 {
   QList<QgsLayoutGuide *> res;

src/core/layout/qgslayoutguidecollection.h

@@ -235,6 +235,11 @@ class CORE_EXPORT QgsLayoutGuideCollection : public QAbstractTableModel, public
      */
     void update();
 
+    /**
+     * Returns a list of all guides contained in the collection.
+     */
+    QList< QgsLayoutGuide * > guides();
+
     /**
      * Returns the list of guides contained in the collection with the specified
      * \a orientation and on a matching \a page.

tests/src/python/test_qgslayoutexporter.py

@@ -25,10 +25,13 @@
                        QgsProject,
                        QgsMargins,
                        QgsLayoutItemShape,
+                       QgsLayoutGuide,
                        QgsRectangle,
                        QgsLayoutItemPage,
                        QgsLayoutItemMap,
                        QgsLayoutPoint,
+                       QgsLayoutMeasurement,
+                       QgsUnitTypes,
                        QgsSimpleFillSymbolLayer,
                        QgsFillSymbol)
 from qgis.PyQt.QtCore import QSize, QSizeF, QDir, QRectF, Qt
@@ -188,6 +191,10 @@ def testRenderRegion(self):
         l = QgsLayout(QgsProject.instance())
         l.initializeDefaults()
 
+        # add a guide, to ensure it is not included in export
+        g1 = QgsLayoutGuide(Qt.Horizontal, QgsLayoutMeasurement(15, QgsUnitTypes.LayoutMillimeters), l.pageCollection().page(0))
+        l.guides().addGuide(g1)
+
         # add some items
         item1 = QgsLayoutItemShape(l)
         item1.attemptSetSceneRect(QRectF(10, 20, 100, 150))