Hook up snap to guides menu option

python/core/layout/qgslayoutsnapper.sip

@@ -50,6 +50,19 @@ class QgsLayoutSnapper
 %Docstring
  Sets whether snapping to grid is ``enabled``.
 .. seealso:: snapToGrid()
+%End
+
+    bool snapToGuides() const;
+%Docstring
+ Returns true if snapping to guides is enabled.
+.. seealso:: setSnapToGuides()
+ :rtype: bool
+%End
+
+    void setSnapToGuides( bool enabled );
+%Docstring
+ Sets whether snapping to guides is ``enabled``.
+.. seealso:: snapToGuides()
 %End
 
     QPointF snapPoint( QPointF point, double scaleFactor, bool &snapped /Out/ ) const;

src/app/layout/qgslayoutdesignerdialog.cpp

@@ -134,6 +134,7 @@ QgsLayoutDesignerDialog::QgsLayoutDesignerDialog( QWidget *parent, Qt::WindowFla
   connect( mActionSnapGrid, &QAction::triggered, this, &QgsLayoutDesignerDialog::snapToGrid );
 
   connect( mActionShowGuides, &QAction::triggered, this, &QgsLayoutDesignerDialog::showGuides );
+  connect( mActionSnapGuides, &QAction::triggered, this, &QgsLayoutDesignerDialog::snapToGuides );
 
   mView = new QgsLayoutView();
   //mView->setMapCanvas( mQgis->mapCanvas() );
@@ -314,6 +315,7 @@ void QgsLayoutDesignerDialog::setCurrentLayout( QgsLayout *layout )
   mActionShowGrid->setChecked( mLayout->context().gridVisible() );
   mActionSnapGrid->setChecked( mLayout->snapper().snapToGrid() );
   mActionShowGuides->setChecked( mLayout->guides().visible() );
+  mActionSnapGuides->setChecked( mLayout->snapper().snapToGuides() );
 
   createLayoutPropertiesWidget();
 }
@@ -406,7 +408,7 @@ void QgsLayoutDesignerDialog::showGuides( bool visible )
 
 void QgsLayoutDesignerDialog::snapToGuides( bool enabled )
 {
-
+  mLayout->snapper().setSnapToGuides( enabled );
 }
 
 void QgsLayoutDesignerDialog::closeEvent( QCloseEvent * )

src/core/layout/qgslayoutsnapper.cpp

@@ -107,6 +107,10 @@ QPointF QgsLayoutSnapper::snapPointToGrid( QPointF point, double scaleFactor, bo
 double QgsLayoutSnapper::snapPointToGuides( double original, QgsLayoutGuide::Orientation orientation, double scaleFactor, bool &snapped ) const
 {
   snapped = false;
+  if ( !mLayout || !mSnapToGuides )
+  {
+    return original;
+  }
 
   //convert snap tolerance from pixels to layout units
   double alignThreshold = mTolerance / scaleFactor;

src/core/layout/qgslayoutsnapper.h

@@ -65,6 +65,18 @@ class CORE_EXPORT QgsLayoutSnapper
      */
     void setSnapToGrid( bool enabled ) { mSnapToGrid = enabled; }
 
+    /**
+     * Returns true if snapping to guides is enabled.
+     * \see setSnapToGuides()
+     */
+    bool snapToGuides() const { return mSnapToGuides; }
+
+    /**
+     * Sets whether snapping to guides is \a enabled.
+     * \see snapToGuides()
+     */
+    void setSnapToGuides( bool enabled ) { mSnapToGuides = enabled; }
+
     /**
      * Snaps a layout coordinate \a point. If \a point was snapped, \a snapped will be set to true.
      *
@@ -108,6 +120,7 @@ class CORE_EXPORT QgsLayoutSnapper
 
     int mTolerance = 5;
     bool mSnapToGrid = false;
+    bool mSnapToGuides = true;
 
 };
 

tests/src/python/test_qgslayoutsnapper.py

@@ -43,6 +43,11 @@ def testGettersSetters(self):
         s.setSnapToGrid(True)
         self.assertTrue(s.snapToGrid())
 
+        s.setSnapToGuides(False)
+        self.assertFalse(s.snapToGuides())
+        s.setSnapToGuides(True)
+        self.assertTrue(s.snapToGuides())
+
         s.setSnapTolerance(15)
         self.assertEqual(s.snapTolerance(), 15)