X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/e02c72fa45b840601743e11bc6550481a36fa437..55bfbcb92b41ab1c6a0d490f2f3fcadefc069bb7:/include/wx/vscroll.h

diff --git a/include/wx/vscroll.h b/include/wx/vscroll.h
index 06437b0a14..4b18ca6333 100644
--- a/include/wx/vscroll.h
+++ b/include/wx/vscroll.h
@@ -351,7 +351,7 @@ protected:
 
     // forward calls to OnGetRowsHeightHint()
     virtual void OnGetUnitsSizeHint(size_t unitMin, size_t unitMax) const
-        { return OnGetRowsHeightHint(unitMin, unitMax); }
+        { OnGetRowsHeightHint(unitMin, unitMax); }
 
     // again, if not overridden, it will fall back on default method
     virtual wxCoord EstimateTotalHeight() const
@@ -434,7 +434,7 @@ protected:
 
     // forward calls to OnGetColumnsWidthHint()
     virtual void OnGetUnitsSizeHint(size_t unitMin, size_t unitMax) const
-        { return OnGetColumnsWidthHint(unitMin, unitMax); }
+        { OnGetColumnsWidthHint(unitMin, unitMax); }
 
     // again, if not overridden, it will fall back on default method
     virtual wxCoord EstimateTotalWidth() const { return DoEstimateTotalSize(); }
@@ -618,9 +618,15 @@ public:
     virtual bool ScrollPages(int pages) { return ScrollRowPages(pages); }
 
 protected:
+    // unless the code has been updated to override OnGetRowHeight() instead,
     // this function must be overridden in the derived class and it should
     // return the height of the given row in pixels
-    virtual wxCoord OnGetLineHeight(size_t n) const = 0;
+    virtual wxCoord OnGetLineHeight(size_t WXUNUSED(n)) const
+    {
+        wxFAIL_MSG( _T("must be overridden if OnGetRowHeight() isn't!") );
+
+        return -1;
+    }
 
     // forwards the calls from base class pure virtual function to pure virtual
     // OnGetLineHeight instead (backwards compatible name)
@@ -648,7 +654,7 @@ protected:
     // forwards the calls from base class pure virtual function to pure virtual
     // OnGetLinesHint instead (backwards compatible name)
     void OnGetRowsHeightHint(size_t rowMin, size_t rowMax) const
-        { return OnGetLinesHint(rowMin, rowMax); }
+        { OnGetLinesHint(rowMin, rowMax); }
 
 
     // get the total height of the lines between lineMin (inclusive) and