X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0fa9b2ed61307e4cc7ccf19441b1c047daee2a7f..c44db939d6fb7975ee95747cdfb158001675e0e1:/src/generic/vscroll.cpp

diff --git a/src/generic/vscroll.cpp b/src/generic/vscroll.cpp
index 809ae48576..0572b8e07b 100644
--- a/src/generic/vscroll.cpp
+++ b/src/generic/vscroll.cpp
@@ -31,6 +31,8 @@
 
 #include "wx/vscroll.h"
 
+#include "wx/utils.h"   // For wxMin/wxMax().
+
 // ============================================================================
 // wxVarScrollHelperEvtHandler declaration
 // ============================================================================
@@ -97,10 +99,6 @@ bool wxVarScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
     if ( wasSkipped )
         event.Skip(false);
 
-    // reset the skipped flag to false as it might have been set to true in
-    // ProcessEvent() above
-    event.Skip(false);
-
     if ( evType == wxEVT_SCROLLWIN_TOP ||
          evType == wxEVT_SCROLLWIN_BOTTOM ||
          evType == wxEVT_SCROLLWIN_LINEUP ||
@@ -127,8 +125,7 @@ bool wxVarScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
     }
 #endif // wxUSE_MOUSEWHEEL
 
-    if ( processed )
-        event.Skip(wasSkipped);
+    event.Skip(wasSkipped);
 
     return processed;
 }
@@ -313,14 +310,17 @@ size_t wxVarScrollHelperBase::GetNewScrollPosition(wxScrollWinEvent& event) cons
     }
     else if ( evtType == wxEVT_SCROLLWIN_PAGEUP )
     {
-        return FindFirstVisibleFromLast(m_unitFirst);
+        // Page up should do at least as much as line up.
+        return wxMin(FindFirstVisibleFromLast(m_unitFirst),
+                    m_unitFirst ? m_unitFirst - 1 : 0);
     }
     else if ( evtType == wxEVT_SCROLLWIN_PAGEDOWN )
     {
+        // And page down should do at least as much as line down.
         if ( GetVisibleEnd() )
-            return GetVisibleEnd() - 1;
+            return wxMax(GetVisibleEnd() - 1, m_unitFirst + 1);
         else
-            return GetVisibleEnd();
+            return wxMax(GetVisibleEnd(), m_unitFirst + 1);
     }
     else if ( evtType == wxEVT_SCROLLWIN_THUMBRELEASE )
     {
@@ -827,7 +827,7 @@ void wxVarHVScrollHelper::RefreshRowColumn(size_t row, size_t column)
         h_rect.x += OnGetColumnWidth(n);
     }
 
-    // refresh but specialize the behavior if we have a single target window
+    // refresh but specialize the behaviour if we have a single target window
     if ( wxVarVScrollHelper::GetTargetWindow() == wxVarHScrollHelper::GetTargetWindow() )
     {
         v_rect.x = h_rect.x;
@@ -894,7 +894,7 @@ void wxVarHVScrollHelper::RefreshRowsColumns(size_t fromRow, size_t toRow,
         h_rect.width += OnGetColumnWidth(nBetween);
     }
 
-    // refresh but specialize the behavior if we have a single target window
+    // refresh but specialize the behaviour if we have a single target window
     if ( wxVarVScrollHelper::GetTargetWindow() == wxVarHScrollHelper::GetTargetWindow() )
     {
         v_rect.x = h_rect.x;