tdf#98175 fix Impress crash

Caused by my commit f29c0b2b3e8861909fa2c6c37bf631ab01590541
"boost::shared_ptr->std::shared_ptr in slideshow"

where I foolishly converted
shared_from_this()
to
std::shared_ptr<Activity>((Activity*)this) )
all over the place, which is bad, I should have used
std::dynamic_pointer_cast<ViewEventHandler>(shared_from_this())

Ah, the joys of C++ memory management.

Change-Id: I9b538e78730c9107870f406cb8ba482d491dd568

5 files changed, 8 insertions, 5 deletions

diff --git a/slideshow/source/engine/rehearsetimingsactivity.cxx b/slideshow/source/engine/rehearsetimingsactivity.cxx
index eb3b835650c0..4dc66f19c109 100644
--- a/slideshow/source/engine/rehearsetimingsactivity.cxx
+++ b/slideshow/source/engine/rehearsetimingsactivity.cxx
@@ -217,7 +217,7 @@ void RehearseTimingsActivity::start()
     for_each_sprite( []( const ::cppcanvas::CustomSpriteSharedPtr& pSprite )
                      { return pSprite->show(); } );
 
-    mrActivitiesQueue.addActivity( std::shared_ptr<Activity>(this) );
+    mrActivitiesQueue.addActivity( std::dynamic_pointer_cast<Activity>(shared_from_this()) );
 
     mpMouseHandler->reset();
     mrEventMultiplexer.addClickHandler(
diff --git a/slideshow/source/engine/shapes/drawinglayeranimation.cxx b/slideshow/source/engine/shapes/drawinglayeranimation.cxx
index 5083a4a34ef1..08b53cef34ca 100644
--- a/slideshow/source/engine/shapes/drawinglayeranimation.cxx
+++ b/slideshow/source/engine/shapes/drawinglayeranimation.cxx
@@ -859,7 +859,7 @@ ActivityImpl::ActivityImpl(
 bool ActivityImpl::enableAnimations()
 {
     mbIsActive = true;
-    return maContext.mrActivitiesQueue.addActivity( ActivitySharedPtr(this) );
+    return maContext.mrActivitiesQueue.addActivity( std::dynamic_pointer_cast<Activity>(shared_from_this()) );
 }
 
 ActivityImpl::~ActivityImpl()
diff --git a/slideshow/source/engine/shapes/intrinsicanimationactivity.cxx b/slideshow/source/engine/shapes/intrinsicanimationactivity.cxx
index 8740272be899..dfefa44bad4f 100644
--- a/slideshow/source/engine/shapes/intrinsicanimationactivity.cxx
+++ b/slideshow/source/engine/shapes/intrinsicanimationactivity.cxx
@@ -248,7 +248,8 @@ namespace slideshow
         bool IntrinsicAnimationActivity::enableAnimations()
         {
             mbIsActive = true;
-            return maContext.mrActivitiesQueue.addActivity( ActivitySharedPtr(this) );
+            return maContext.mrActivitiesQueue.addActivity( std::dynamic_pointer_cast<Activity>(shared_from_this()) );
+
         }
 
 
diff --git a/slideshow/source/engine/transitions/slidechangebase.cxx b/slideshow/source/engine/transitions/slidechangebase.cxx
index e5a24e8450a2..a13dd27be25f 100644
--- a/slideshow/source/engine/transitions/slidechangebase.cxx
+++ b/slideshow/source/engine/transitions/slidechangebase.cxx
@@ -176,7 +176,7 @@ void SlideChangeBase::prefetch( const AnimatableShapeSharedPtr&,
         return;
 
     // register ourselves for view change events
-    mrEventMultiplexer.addViewHandler( std::shared_ptr<ViewEventHandler>(this) );
+    mrEventMultiplexer.addViewHandler( std::dynamic_pointer_cast<ViewEventHandler>(shared_from_this()) );
 
     // init views and create slide bitmaps
     for( const auto& pView : mrViewContainer )
@@ -251,7 +251,7 @@ void SlideChangeBase::end()
     mbSpritesVisible = false;
 
     // remove also from event multiplexer, we're dead anyway
-    mrEventMultiplexer.removeViewHandler( std::shared_ptr<ViewEventHandler>(this) );
+    mrEventMultiplexer.removeViewHandler( std::dynamic_pointer_cast<ViewEventHandler>(shared_from_this()) );
 }
 
 bool SlideChangeBase::operator()( double nValue )
diff --git a/slideshow/source/inc/disposable.hxx b/slideshow/source/inc/disposable.hxx
index c85e3698e953..f1f693a23e33 100644
--- a/slideshow/source/inc/disposable.hxx
+++ b/slideshow/source/inc/disposable.hxx
@@ -36,6 +36,8 @@ namespace slideshow
          */
         class SharedPtrAble : public std::enable_shared_from_this<SharedPtrAble>
         {
+        public:
+            virtual ~SharedPtrAble() {}
         };
 
         /** Disposable interface