Advanced Diagram support: first additions/reorganizations

To allow advanced Diagram/SmartArt support in the future
this is a first step to organize imported SmartArt Data in
a way that will allow to re-layout loaded SmartArts, under
re-usage of the oox::Theme (held available).

It is designed to work without holding available the
original XML snippets defining the imported Diagram in any
way, also for performance reasons. It tries to re-use some
of the already basically added functionality, including
the systematic layouting using the generic layout
algorithm, plus some already available text extraction.

Before being sure that the former state can be completely
replaced this is optoinal and used when
SAL_ENABLE_ADVANCED_SMART_ART is defined. Some new stuff
is already done but e.g. the redefined reLayout method will
not (yet) be triggered. It works and reliably produces a
re-layouted identical version, also preserving
transformations.

Change-Id: I08cfbae04afa663d0589530aae549216d853128d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/130171
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/include/svx/svdogrp.hxx b/include/svx/svdogrp.hxx
index eb2f620334b9..1616355c81ce 100644
--- a/include/svx/svdogrp.hxx
+++ b/include/svx/svdogrp.hxx
@@ -26,6 +26,21 @@
 
 // Forward declarations
 class SfxItemSet;
+class SdrObjGroup;
+
+// Helper class to allow administer advanced Diagram related
+// data and functionality
+class SVXCORE_DLLPUBLIC DiagramHelper
+{
+protected:
+    void anchorToSdrObjGroup(SdrObjGroup& rTarget);
+
+public:
+    DiagramHelper();
+    virtual ~DiagramHelper();
+
+    virtual void reLayout() = 0;
+};
 
 //   SdrObjGroup
 class SVXCORE_DLLPUBLIC SdrObjGroup final : public SdrObject, public SdrObjList
@@ -37,6 +52,15 @@ private:
 
     Point maRefPoint; // Reference point inside the object group
 
+    // Allow *only* DiagramHelper itself to set this internal reference to
+    // tightly control usage
+    friend class DiagramHelper;
+    std::unique_ptr<DiagramHelper> mp_DiagramHelper;
+
+public:
+    bool isDiagram() const { return bool(mp_DiagramHelper); }
+    DiagramHelper* getDiagramHelper() { return mp_DiagramHelper.get(); }
+
 private:
     // protected destructor - due to final, make private
     virtual ~SdrObjGroup() override;