X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9a83f860948059b0273b5cc6d9e43fadad3ebfca..f239a20092359e3c914adb79bd39f3f5d2b2e06f:/src/generic/vscroll.cpp?ds=sidebyside

diff --git a/src/generic/vscroll.cpp b/src/generic/vscroll.cpp
index a98c29da79..c1b5a4071a 100644
--- a/src/generic/vscroll.cpp
+++ b/src/generic/vscroll.cpp
@@ -97,10 +97,6 @@ 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 +123,7 @@ bool wxVarScrollHelperEvtHandler::ProcessEvent(wxEvent& event)
     }
 #endif // wxUSE_MOUSEWHEEL
 
-    if ( processed )
-        event.Skip(wasSkipped);
+    event.Skip(wasSkipped);
 
     return processed;
 }
@@ -674,6 +669,39 @@ bool wxVarScrollHelperBase::DoScrollPages(int pages)
 
 void wxVarScrollHelperBase::HandleOnSize(wxSizeEvent& event)
 {
+    if ( m_unitMax )
+    {
+        // sometimes change in varscrollable window's size can result in
+        // unused empty space after the last item. Fix it by decrementing
+        // first visible item position according to the available space.
+
+        // determine free space
+        const wxCoord sWindow = GetOrientationTargetSize();
+        wxCoord s = 0;
+        size_t unit;
+        for ( unit = m_unitFirst; unit < m_unitMax; ++unit )
+        {
+            if ( s > sWindow )
+                break;
+
+            s += OnGetUnitSize(unit);
+        }
+        wxCoord freeSpace = sWindow - s;
+
+        // decrement first visible item index as long as there is free space
+        size_t idealUnitFirst;
+        for ( idealUnitFirst = m_unitFirst;
+              idealUnitFirst > 0;
+              idealUnitFirst-- )
+        {
+            wxCoord us = OnGetUnitSize(idealUnitFirst-1);
+            if ( freeSpace < us )
+                break;
+            freeSpace -= us;
+        }
+        m_unitFirst = idealUnitFirst;
+    }
+
     UpdateScrollbar();
 
     event.Skip();
@@ -794,7 +822,7 @@ 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;
@@ -861,7 +889,7 @@ 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;
@@ -936,7 +964,7 @@ IMPLEMENT_ABSTRACT_CLASS(wxHVScrolledWindow, wxPanel)
 // wxVarVScrollLegacyAdaptor
 // ===========================================================================
 
-size_t wxVarVScrollLegacyAdaptor::GetFirstVisibleLine() const 
+size_t wxVarVScrollLegacyAdaptor::GetFirstVisibleLine() const
 { return GetVisibleRowsBegin(); }
 
 size_t wxVarVScrollLegacyAdaptor::GetLastVisibleLine() const
@@ -953,13 +981,13 @@ void wxVarVScrollLegacyAdaptor::RefreshLine(size_t line)
 
 void wxVarVScrollLegacyAdaptor::RefreshLines(size_t from, size_t to)
 { RefreshRows(from, to); }
-        
+
 bool wxVarVScrollLegacyAdaptor::ScrollToLine(size_t line)
 { return ScrollToRow(line); }
 
 bool wxVarVScrollLegacyAdaptor::ScrollLines(int lines)
 { return ScrollRows(lines); }
-        
+
 bool wxVarVScrollLegacyAdaptor::ScrollPages(int pages)
 { return ScrollRowPages(pages); }