Make GetParent() const-correct.

const method should return const pointer if it points to an object held
internally & prefer taking const pointer as a method argument if possible.

Change-Id: I4dc8c31d55aa0054ea6db521be9ad45fefef8d07

svtools/inc/svtools/treelist.hxx

@@ -256,7 +256,10 @@ public:
     SvTreeListEntry*        GetEntry( SvTreeListEntry* pParent, sal_uLong nPos ) const;
     SvTreeListEntry*        GetEntry( sal_uLong nRootPos ) const;
     SvTreeListEntry*        GetEntryAtAbsPos( sal_uLong nAbsPos ) const;
-    SvTreeListEntry*        GetParent( SvTreeListEntry* pEntry ) const;
+
+    const SvTreeListEntry* GetParent( const SvTreeListEntry* pEntry ) const;
+    SvTreeListEntry* GetParent( SvTreeListEntry* pEntry );
+
     SvTreeListEntry*        GetRootLevelParent( SvTreeListEntry* pEntry ) const;
     const SvTreeListEntries& GetChildList( SvTreeListEntry* pParent ) const;
     SvTreeListEntries& GetChildList( SvTreeListEntry* pParent );

svtools/inc/svtools/treelistbox.hxx

@@ -399,7 +399,8 @@ public:
     void            FillEntryPath( SvTreeListEntry* pEntry, ::std::deque< sal_Int32 >& _rPath ) const;
 
     using Window::GetParent;
-    SvTreeListEntry*    GetParent( SvTreeListEntry* pEntry ) const;
+    const SvTreeListEntry* GetParent( const SvTreeListEntry* pEntry ) const;
+    SvTreeListEntry* GetParent( SvTreeListEntry* pEntry ) const;
     SvTreeListEntry*    GetRootLevelParent(SvTreeListEntry* pEntry ) const;
 
     using Window::GetChildCount;

svtools/source/contnr/treelist.cxx

@@ -1855,11 +1855,19 @@ SvTreeListEntries& SvTreeList::GetChildList( SvTreeListEntry* pParent )
     return pParent->maChildren;
 }
 
-SvTreeListEntry* SvTreeList::GetParent( SvTreeListEntry* pEntry ) const
+const SvTreeListEntry* SvTreeList::GetParent( const SvTreeListEntry* pEntry ) const
+{
+    const SvTreeListEntry* pParent = pEntry->pParent;
+    if (pParent == pRootItem)
+        pParent = NULL;
+    return pParent;
+}
+
+SvTreeListEntry* SvTreeList::GetParent( SvTreeListEntry* pEntry )
 {
     SvTreeListEntry* pParent = pEntry->pParent;
-    if ( pParent==pRootItem )
-        pParent = 0;
+    if (pParent == pRootItem)
+        pParent = NULL;
     return pParent;
 }
 

svtools/source/contnr/treelistbox.cxx

@@ -938,6 +938,11 @@ void SvTreeListBox::FillEntryPath( SvTreeListEntry* pEntry, ::std::deque< sal_In
     }
 }
 
+const SvTreeListEntry* SvTreeListBox::GetParent( const SvTreeListEntry* pEntry ) const
+{
+    return pModel->GetParent(pEntry);
+}
+
 SvTreeListEntry* SvTreeListBox::GetParent( SvTreeListEntry* pEntry ) const
 {
     return pModel->GetParent(pEntry);