do not second-guess which classes use a stylesheet

Change-Id: I76b23bcdca2e7394fd5ab67e8341f4cdb46f8a64

4 files changed, 49 insertions, 1 deletions

diff --git a/svl/Package_inc.mk b/svl/Package_inc.mk
index e51821957c63..5ac424db563f 100644
--- a/svl/Package_inc.mk
+++ b/svl/Package_inc.mk
@@ -97,6 +97,7 @@ $(eval $(call gb_Package_add_file,svl_inc,inc/svl/strmadpt.hxx,svl/strmadpt.hxx)
 $(eval $(call gb_Package_add_file,svl_inc,inc/svl/style.hrc,svl/style.hrc))
 $(eval $(call gb_Package_add_file,svl_inc,inc/svl/style.hxx,svl/style.hxx))
 $(eval $(call gb_Package_add_file,svl_inc,inc/svl/stylepool.hxx,svl/stylepool.hxx))
+$(eval $(call gb_Package_add_file,svl_inc,inc/svl/stylesheetuser.hxx,svl/stylesheetuser.hxx))
 $(eval $(call gb_Package_add_file,svl_inc,inc/svl/svdde.hxx,svl/svdde.hxx))
 $(eval $(call gb_Package_add_file,svl_inc,inc/svl/svl.hrc,svl/svl.hrc))
 $(eval $(call gb_Package_add_file,svl_inc,inc/svl/svldllapi.h,svl/svldllapi.h))
diff --git a/svl/inc/svl/style.hxx b/svl/inc/svl/style.hxx
index 48557c5457d8..18c0cebcf0fb 100644
--- a/svl/inc/svl/style.hxx
+++ b/svl/inc/svl/style.hxx
@@ -34,6 +34,7 @@
 #include <svl/lstner.hxx>
 #include <svl/brdcst.hxx>
 #include <svl/poolitem.hxx>
+#include <svl/stylesheetuser.hxx>
 
 #include <svl/style.hrc>
 
@@ -267,7 +268,7 @@ public:
 //=========================================================================
 
 class SVL_DLLPUBLIC SfxStyleSheet: public SfxStyleSheetBase,
-                     public SfxListener, public SfxBroadcaster
+                     public SfxListener, public SfxBroadcaster, public svl::StyleSheetUser
 {
 public:
                         TYPEINFO();
@@ -276,6 +277,9 @@ public:
                         SfxStyleSheet( const SfxStyleSheet& );
 
     virtual void        Notify( SfxBroadcaster& rBC, const SfxHint& rHint );
+
+    virtual bool        isUsedByModel() const;
+
     virtual bool        SetParent( const UniString& );
 
 protected:
diff --git a/svl/inc/svl/stylesheetuser.hxx b/svl/inc/svl/stylesheetuser.hxx
new file mode 100644
index 000000000000..787263ff4a8e
--- /dev/null
+++ b/svl/inc/svl/stylesheetuser.hxx
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef SVL_STYLESHEETUSER_HXX_INCLUDED
+#define SVL_STYLESHEETUSER_HXX_INCLUDED
+
+namespace svl
+{
+
+/** Test whether object that uses a stylesheet is used itself.
+
+  This interface should be implemented by all classes that use
+  a SfxStyleSheet (and listen on it). It can be queried by the stylesheet
+  to determine if it is really used.
+  */
+class StyleSheetUser
+{
+public:
+    /** Test whether this object is used.
+
+      @return true, if the object is used, false otherwise
+      */
+    virtual bool isUsedByModel() const = 0;
+protected:
+    ~StyleSheetUser() {}
+};
+
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svl/source/items/style.cxx b/svl/source/items/style.cxx
index 6df5bfa71b6e..812567cc830d 100644
--- a/svl/source/items/style.cxx
+++ b/svl/source/items/style.cxx
@@ -913,6 +913,11 @@ void SfxStyleSheet::Notify(SfxBroadcaster& rBC, const SfxHint& rHint )
     Forward(rBC, rHint);
 }
 
+bool SfxStyleSheet::isUsedByModel() const
+{
+    return IsUsed();
+}
+
 //////////////////////// SfxStyleSheetPool ///////////////////////////////
 
 SfxStyleSheetPool::SfxStyleSheetPool( SfxItemPool const& rSet)