Advanced Diagram support: UNDO/REDO support for Diagram DataModel

Added support for UNDO/REDO for changes in Diagram ModelData.
This is currenly applied/used in the DiagramDialog for it's
Add/Remove actions (also supports Cancel of that dialog 1st
time ever). But it is defined more general to add/support
manipulating actions like clone/change_text etc. Also the
UI/dialog at he end will not be/stay modal, so this is a
test implemenation how to use it.

It uses an extract/apply mechanism to get/set the Diagram
ModelData at/for the UNDO action. That may be expanded as
needed for additional data in he future. It may also be
considered to modify the Connection/Point ModelData to
shared_ptr internally completely to avoid copying these
at all. OTOH it is not that much data to handle at all.

Change-Id: I4702ed908b79a476177fe66c0e3284898c6adda5
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134118
Tested-by: Jenkins
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/svx/source/diagram/datamodel.cxx b/svx/source/diagram/datamodel.cxx
index fd562645eaa0..e45fe7fb4c3a 100644
--- a/svx/source/diagram/datamodel.cxx
+++ b/svx/source/diagram/datamodel.cxx
@@ -141,6 +141,33 @@ bool DiagramData::removeNode(const OUString& rNodeId)
     return true;
 }
 
+DiagramDataState::DiagramDataState(const Connections& rConnections, const Points& rPoints)
+: maConnections(rConnections)
+, maPoints(rPoints)
+{
+}
+
+DiagramDataStatePtr DiagramData::extractDiagramDataState() const
+{
+    // Just copy all Connections && Points. The shared_ptr data in
+    // Point-entries is no problem, it just continues exiting shared
+    return std::make_shared< DiagramDataState >(maConnections, maPoints);
+}
+
+void DiagramData::applyDiagramDataState(const DiagramDataStatePtr& rState)
+{
+    if(rState)
+    {
+        maConnections = rState->getConnections();
+        maPoints = rState->getPoints();
+
+        // Reset temporary buffered ModelData association lists & rebuild them
+        // and the Diagram DataModel. Do that here *immediately* to prevent
+        // re-usage of potentially invalid Connection/Point objects
+        buildDiagramDataModel(true);
+    }
+}
+
 void DiagramData::getChildrenString(
     OUStringBuffer& rBuf,
     const svx::diagram::Point* pPoint,
diff --git a/svx/source/svdraw/svdundo.cxx b/svx/source/svdraw/svdundo.cxx
index f1c97c4c16a8..b61ad93fde90 100644
--- a/svx/source/svdraw/svdundo.cxx
+++ b/svx/source/svdraw/svdundo.cxx
@@ -45,6 +45,7 @@
 #include <svx/svdoashp.hxx>
 #include <sal/log.hxx>
 #include <osl/diagnose.h>
+#include <svx/diagram/datamodel.hxx>
 
 
 // iterates over all views and unmarks this SdrObject if it is marked
@@ -628,6 +629,52 @@ OUString SdrUndoGeoObj::GetComment() const
     return ImpGetDescriptionStr(STR_DragMethObjOwn);
 }
 
+SdrUndoDiagramModelData::SdrUndoDiagramModelData(SdrObject& rNewObj, svx::diagram::DiagramDataStatePtr& rStartState)
+: SdrUndoObj(rNewObj)
+, m_aStartState(rStartState)
+, m_aEndState()
+{
+    SdrObjGroup* pDiagram(dynamic_cast<SdrObjGroup*>(&rNewObj));
+
+    if(pDiagram && pDiagram->isDiagram())
+    {
+        m_aEndState = pDiagram->getDiagramHelper()->extractDiagramDataState();
+    }
+}
+
+SdrUndoDiagramModelData::~SdrUndoDiagramModelData()
+{
+}
+
+void SdrUndoDiagramModelData::implUndoRedo(bool bUndo)
+{
+    if(nullptr == pObj)
+        return;
+
+    SdrObjGroup* pDiagram(dynamic_cast<SdrObjGroup*>(pObj));
+
+    if(nullptr == pDiagram || !pDiagram->isDiagram())
+        return;
+
+    pDiagram->getDiagramHelper()->applyDiagramDataState(
+        bUndo ? m_aStartState : m_aEndState);
+    pDiagram->getDiagramHelper()->reLayout(*pDiagram);
+}
+
+void SdrUndoDiagramModelData::Undo()
+{
+    implUndoRedo(true);
+}
+
+void SdrUndoDiagramModelData::Redo()
+{
+    implUndoRedo(false);
+}
+
+OUString SdrUndoDiagramModelData::GetComment() const
+{
+    return ImpGetDescriptionStr(STR_DiagramModelDataChange);
+}
 
 SdrUndoObjList::SdrUndoObjList(SdrObject& rNewObj, bool bOrdNumDirect)
     : SdrUndoObj(rNewObj)
@@ -1676,6 +1723,12 @@ std::unique_ptr<SdrUndoAction> SdrUndoFactory::CreateUndoGeoObject( SdrObject& r
     return std::make_unique<SdrUndoGeoObj>( rObject );
 }
 
+// Diagram ModelData changes
+std::unique_ptr<SdrUndoAction> SdrUndoFactory::CreateUndoDiagramModelData( SdrObject& rObject, std::shared_ptr< svx::diagram::DiagramDataState >& rStartState )
+{
+    return std::make_unique<SdrUndoDiagramModelData>( rObject, rStartState );
+}
+
 std::unique_ptr<SdrUndoAction> SdrUndoFactory::CreateUndoAttrObject( SdrObject& rObject, bool bStyleSheet1, bool bSaveText )
 {
     return std::make_unique<SdrUndoAttrObj>( rObject, bStyleSheet1, bSaveText );