Avoid an assert when m_dir is empty

[wxWidgets.git] / src / msw / listctrl.cpp

diff --git a/src/msw/listctrl.cpp b/src/msw/listctrl.cpp
index c8635708c8ff172f687e834cf0506ade3c409c7b..1e1c9a722c4ccf43c34192c48d0190df29ef7ccc 100644 (file)
--- a/src/msw/listctrl.cpp
+++ b/src/msw/listctrl.cpp
@@ -34,6 +34,7 @@
     #include "wx/intl.h"
     #include "wx/log.h"
     #include "wx/settings.h"
+    #include "wx/stopwatch.h"
     #include "wx/dcclient.h"
     #include "wx/textctrl.h"
 #endif
@@ -1441,7 +1442,7 @@ void wxListCtrl::InitEditControl(WXHWND hWnd)
     m_textCtrl->SubclassWin(hWnd);
     m_textCtrl->SetParent(this);
 
-    // we must disallow TABbing away from the control while the edit contol is
+    // we must disallow TABbing away from the control while the edit control is
     // shown because this leaves it in some strange state (just try removing
     // this line and then pressing TAB while editing an item in  listctrl
     // inside a panel)
@@ -1726,7 +1727,9 @@ long wxListCtrl::InsertItem(long index, const wxString& label, int imageIndex)
     wxListItem info;
     info.m_image = imageIndex;
     info.m_text = label;
-    info.m_mask = wxLIST_MASK_IMAGE | wxLIST_MASK_TEXT;
+    info.m_mask = wxLIST_MASK_TEXT;
+    if (imageIndex > -1)
+        info.m_mask |= wxLIST_MASK_IMAGE;
     info.m_itemId = index;
     return InsertItem(info);
 }
@@ -1820,8 +1823,8 @@ int CALLBACK wxInternalDataCompareFunc(LPARAM lParam1, LPARAM lParam2,  LPARAM l
     wxMSWListItemData *data1 = (wxMSWListItemData *) lParam1;
     wxMSWListItemData *data2 = (wxMSWListItemData *) lParam2;
 
-    long d1 = (data1 == NULL ? 0 : data1->lParam);
-    long d2 = (data2 == NULL ? 0 : data2->lParam);
+    wxIntPtr d1 = (data1 == NULL ? 0 : data1->lParam);
+    wxIntPtr d2 = (data2 == NULL ? 0 : data2->lParam);
 
     return internalData->user_fn(d1, d2, internalData->data);
 
@@ -2366,12 +2369,8 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
 
 #ifdef HAVE_NMLVFINDITEM
             case LVN_ODFINDITEM:
-                // this message is only used with the virtual list control but
-                // even there we don't want to always use it: in a control with
-                // sufficiently big number of items (defined as > 1000 here),
-                // accidentally pressing a key could result in hanging an
-                // application waiting while it performs linear search
-                if ( IsVirtual() && GetItemCount() <= 1000 )
+                // Find an item in a (necessarily virtual) list control.
+                if ( IsVirtual() )
                 {
                     NMLVFINDITEM* pFindInfo = (NMLVFINDITEM*)lParam;
 
@@ -2411,6 +2410,12 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                         startPos = 0;
                     }
 
+                    // Linear search in a control with a lot of items can take
+                    // a long time so we limit the total time of the search to
+                    // ensure that the program doesn't appear to hang.
+#if wxUSE_STOPWATCH
+                    wxStopWatch sw;
+#endif // wxUSE_STOPWATCH
                     for ( int currentPos = startPos; ; )
                     {
                         // does this item begin with searchstr?
@@ -2440,6 +2445,26 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
                             // item by default in this case.
                             return true;
                         }
+
+#if wxUSE_STOPWATCH
+                        // Check the time elapsed only every thousand
+                        // iterations for performance reasons: if we did it
+                        // more often calling wxStopWatch::Time() could take
+                        // noticeable time on its own.
+                        if ( !((currentPos - startPos)%1000) )
+                        {
+                            // We use half a second to limit the search time
+                            // which is about as long as we can take without
+                            // annoying the user.
+                            if ( sw.Time() > 500 )
+                            {
+                                // As above, return true to prevent the control
+                                // from selecting the first item by default.
+                                return true;
+                            }
+                        }
+#endif // wxUSE_STOPWATCH
+
                     }
 
                     SetItemState(*result,