Start of multiframe porting

python/core/core_auto.sip

@@ -406,6 +406,7 @@
 %Include layout/qgslayoutcontext.sip
 %Include layout/qgslayouteffect.sip
 %Include layout/qgslayoutguidecollection.sip
+%Include layout/qgslayoutframe.sip
 %Include layout/qgslayoutitem.sip
 %Include layout/qgslayoutitemgroup.sip
 %Include layout/qgslayoutitemlabel.sip
@@ -422,6 +423,7 @@
 %Include layout/qgslayoutitemregistry.sip
 %Include layout/qgslayoutitemshape.sip
 %Include layout/qgslayoutmodel.sip
+%Include layout/qgslayoutmultiframe.sip
 %Include layout/qgslayoutpagecollection.sip
 %Include layout/qgslayoutobject.sip
 %Include layout/qgslayoutundostack.sip

python/core/layout/qgslayout.sip

@@ -379,6 +379,28 @@ class QgsLayout : QGraphicsScene, QgsExpressionContextGenerator, QgsLayoutUndoOb
  The item will also be deleted.
 %End
 
+    void addMultiFrame( QgsLayoutMultiFrame *multiFrame /Transfer/ );
+%Docstring
+ Adds a ``multiFrame`` to the layout. The object is owned by the layout until removeMultiFrame() is called.
+.. seealso:: removeMultiFrame()
+.. seealso:: multiFrames()
+%End
+
+    void removeMultiFrame( QgsLayoutMultiFrame *multiFrame );
+%Docstring
+ Removes a ``multiFrame`` from the layout (but does not delete it).
+.. seealso:: addMultiFrame()
+.. seealso:: multiFrames()
+%End
+
+    QSet< QgsLayoutMultiFrame * > multiFrames() const;
+%Docstring
+ Returns a list of multi frames contained in the layout.
+.. seealso:: addMultiFrame()
+.. seealso:: removeMultiFrame()
+ :rtype: set of QgsLayoutMultiFrame
+%End
+
     QDomElement writeXml( QDomDocument &document, const QgsReadWriteContext &context ) const;
 %Docstring
  Returns the layout's state encapsulated in a DOM element.

python/core/layout/qgslayoutframe.sip

@@ -0,0 +1,115 @@
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/layout/qgslayoutframe.h                                     *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/
+
+
+
+
+class QgsLayoutFrame: QgsLayoutItem
+{
+%Docstring
+ Base class for frame items, which form a layout multiframe item.
+.. versionadded:: 3.0
+%End
+
+%TypeHeaderCode
+#include "qgslayoutframe.h"
+%End
+  public:
+
+    QgsLayoutFrame( QgsLayout *layout, QgsLayoutMultiFrame *multiFrame );
+%Docstring
+ Constructor for QgsLayoutFrame, with the specified parent ``layout``
+ and belonging to a ``multiFrame``.
+%End
+
+    virtual int type() const;
+
+    virtual QString stringType() const;
+
+
+    virtual QString displayName() const;
+
+
+    void setContentSection( const QRectF &section );
+%Docstring
+ Sets the visible part of the multiframe's content which is visible within
+ this frame (relative to the total multiframe extent in layout units).
+.. seealso:: extent()
+%End
+
+    QgsLayoutMultiFrame *multiFrame() const;
+%Docstring
+ Returns the parent multiframe for the frame.
+ :rtype: QgsLayoutMultiFrame
+%End
+
+
+    QRectF extent() const;
+%Docstring
+ Returns the visible portion of the multi frame's content which
+ is shown in this frame, in layout units.
+.. seealso:: setContentSection()
+ :rtype: QRectF
+%End
+
+    bool hidePageIfEmpty() const;
+%Docstring
+ Returns whether the page should be hidden (ie, not included in layout exports) if this frame is empty
+ :return: true if page should be hidden if frame is empty
+.. seealso:: setHidePageIfEmpty()
+ :rtype: bool
+%End
+
+    void setHidePageIfEmpty( const bool hidePageIfEmpty );
+%Docstring
+ Sets whether the page should be hidden (ie, not included in layout exports) if this frame is empty
+ \param hidePageIfEmpty set to true if page should be hidden if frame is empty
+.. seealso:: hidePageIfEmpty()
+%End
+
+    bool hideBackgroundIfEmpty() const;
+%Docstring
+ Returns whether the background and frame stroke should be hidden if this frame is empty
+ :return: true if background and stroke should be hidden if frame is empty
+.. seealso:: setHideBackgroundIfEmpty()
+ :rtype: bool
+%End
+
+    void setHideBackgroundIfEmpty( const bool hideBackgroundIfEmpty );
+%Docstring
+ Sets whether the background and frame stroke should be hidden if this frame is empty
+ \param hideBackgroundIfEmpty set to true if background and stroke should be hidden if frame is empty
+.. seealso:: hideBackgroundIfEmpty()
+%End
+
+    bool isEmpty() const;
+%Docstring
+ Returns whether the frame is empty.
+.. seealso:: hidePageIfEmpty()
+ :rtype: bool
+%End
+
+    virtual QgsExpressionContext createExpressionContext() const;
+
+
+  protected:
+
+    virtual void draw( QgsRenderContext &context, const QStyleOptionGraphicsItem *itemStyle = 0 );
+
+    void drawFrame( QgsRenderContext &context );
+    void drawBackground( QgsRenderContext &context );
+
+};
+
+/************************************************************************
+ * This file has been generated automatically from                      *
+ *                                                                      *
+ * src/core/layout/qgslayoutframe.h                                     *
+ *                                                                      *
+ * Do not edit manually ! Edit header and run scripts/sipify.pl again   *
+ ************************************************************************/

python/core/layout/qgslayoutitemregistry.sip

@@ -109,6 +109,7 @@ class QgsLayoutItemRegistry : QObject
       LayoutShape,
       LayoutPolygon,
       LayoutPolyline,
+      LayoutFrame,
 
       // item
       PluginItem,