fdo#68961: Check visible range during scrolling, and re-paint if necessary.

Change-Id: I47383cc0c4cf0ec48ce621ba5acac33db44ba313
(cherry picked from commit e36c8a674845ab19577fc06d44b780549757e1e7)
Reviewed-on: https://gerrit.libreoffice.org/7352
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>
(cherry picked from commit 1f349d3240115651346da04daeb3459b31782301)
Reviewed-on: https://gerrit.libreoffice.org/7368
Reviewed-by: Eike Rathke <erack@redhat.com>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>
Tested-by: Markus Mohrhard <markus.mohrhard@googlemail.com>

4 files changed, 24 insertions, 9 deletions

diff --git a/sc/source/ui/inc/tabview.hxx b/sc/source/ui/inc/tabview.hxx
index e13d088f2804..056942575487 100644
--- a/sc/source/ui/inc/tabview.hxx
+++ b/sc/source/ui/inc/tabview.hxx
@@ -208,6 +208,12 @@ private:
 
     void            PaintRangeFinderEntry (ScRangeFindData* pData, SCTAB nTab);
 
+    /**
+     * Check the visible grid area to see if the visible range has changed. If
+     * so, update the stored visible range, and re-paint the grid area.
+     */
+    void UpdateGrid();
+
 protected:
     void            UpdateHeaderWidth( const ScVSplitPos* pWhich = NULL,
                                         const SCROW* pPosY = NULL );
diff --git a/sc/source/ui/view/tabview.cxx b/sc/source/ui/view/tabview.cxx
index 1c52550dd280..219653ba5ebe 100644
--- a/sc/source/ui/view/tabview.cxx
+++ b/sc/source/ui/view/tabview.cxx
@@ -1236,6 +1236,8 @@ void ScTabView::ScrollX( long nDeltaX, ScHSplitPos eWhich, bool bUpdBars )
         if (pColOutline[eWhich]) pColOutline[eWhich]->ScrollPixel( nDiff );
         if (bUpdBars)
             UpdateScrollBars();
+        else
+            UpdateGrid();
     }
 
     if (nDeltaX==1 || nDeltaX==-1)
@@ -1321,6 +1323,8 @@ void ScTabView::ScrollY( long nDeltaY, ScVSplitPos eWhich, bool bUpdBars )
         if (pRowOutline[eWhich]) pRowOutline[eWhich]->ScrollPixel( nDiff );
         if (bUpdBars)
             UpdateScrollBars();
+        else
+            UpdateGrid();
     }
 
     if (nDeltaY==1 || nDeltaY==-1)
diff --git a/sc/source/ui/view/tabview3.cxx b/sc/source/ui/view/tabview3.cxx
index cedb9bab0194..9553184ed7c0 100644
--- a/sc/source/ui/view/tabview3.cxx
+++ b/sc/source/ui/view/tabview3.cxx
@@ -2105,6 +2105,19 @@ void ScTabView::PaintRangeFinderEntry (ScRangeFindData* pData, const SCTAB nTab)
     }
 }
 
+void ScTabView::UpdateGrid()
+{
+    if (!aViewData.IsActive())
+        return;
+
+    if (!UpdateVisibleRange())
+        // Visible range hasn't changed. No need to re-paint.
+        return;
+
+    SC_MOD()->AnythingChanged();                // if visible area has changed
+    PaintGrid();
+}
+
 void ScTabView::PaintRangeFinder( long nNumber )
 {
     ScInputHandler* pHdl = SC_MOD()->GetInputHdl( aViewData.GetViewShell() );
diff --git a/sc/source/ui/view/tabview4.cxx b/sc/source/ui/view/tabview4.cxx
index 3aa9a47efeea..ab0208129438 100644
--- a/sc/source/ui/view/tabview4.cxx
+++ b/sc/source/ui/view/tabview4.cxx
@@ -424,15 +424,7 @@ void ScTabView::UpdateScrollBars()
     }
 
     //      set visible area for online spelling
-
-    if ( aViewData.IsActive() )
-    {
-        if (UpdateVisibleRange())
-        {
-            SC_MOD()->AnythingChanged();                // if visible area has changed
-            PaintGrid();
-        }
-    }
+    UpdateGrid();
 }
 
 #ifndef HDR_SLIDERSIZE