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Final (hopefully) version of the DeleteAllItems fix for 2.4

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@18881 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robin Dunn
2003-01-23 05:55:04 +00:00
parent 238027e84e
commit f7530f9459
1 changed files with 29 additions and 8 deletions
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37
src/msw/listctrl.cpp
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@@ -53,6 +53,24 @@
#include "wx/msw/missing.h"
// ----------------------------------------------------------------------------
// private globals (yuck!)
// ----------------------------------------------------------------------------
// Some versions of comctl32.dll don't do what MSDN says it should and still
// sends LVN_DELETEITEM after LVN_DELETEALLITEMS has returned TRUE. This flag
// will be used to enable us to ignore the LVN_DELETEITEM message in these cases.
// Also note that sometimes when there are large numbers of items in the listctrl
// and items have attribute data then when the data is being deleted a
// LVN_ITEMCHANGING message can be sent that will have a bogus value, causing a
// memory fault. This flag will also be used to ignore those change messages.
//
// 2.5 will have a better fix that avoids the use of a global. It was unavoidable
// for 2.4.x because of binary compatibility concerns.
static bool gs_ignoreChangeDeleteItem = FALSE;
// ----------------------------------------------------------------------------
// private functions
// ----------------------------------------------------------------------------
@@ -388,7 +406,9 @@ void wxListCtrl::FreeAllInternalData()
wxListCtrl::~wxListCtrl()
{
gs_ignoreChangeDeleteItem = TRUE;
FreeAllInternalData();
gs_ignoreChangeDeleteItem = FALSE;
if ( m_textCtrl )
{
@@ -1233,7 +1253,11 @@ bool wxListCtrl::DeleteItem(long item)
// Deletes all items
bool wxListCtrl::DeleteAllItems()
{
return ListView_DeleteAllItems(GetHwnd()) != 0;
gs_ignoreChangeDeleteItem = TRUE;
FreeAllInternalData();
bool rval = ListView_DeleteAllItems(GetHwnd()) != 0;
gs_ignoreChangeDeleteItem = FALSE;
return rval;
}
// Deletes all items
@@ -1641,10 +1665,6 @@ bool wxListCtrl::MSWCommand(WXUINT cmd, WXWORD id)
}
// Prevent fetching item data when in the process of deleting it. See
// wxDeleteInternalData below.
static bool gs_deletingItemData = FALSE;
bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
{
// prepare the event
@@ -1787,7 +1807,7 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
case LVN_ITEMCHANGING:
if ( iItem != -1 )
{
if ( iItem >= GetItemCount() || gs_deletingItemData )
if ( iItem >= GetItemCount() || gs_ignoreChangeDeleteItem )
{
// there is apparently a bug in comctl32.dll version
// 5.50.4704.1100 (note that the MS DLL database
@@ -1896,6 +1916,9 @@ bool wxListCtrl::MSWOnNotify(int idCtrl, WXLPARAM lParam, WXLPARAM *result)
break;
case LVN_DELETEITEM:
if ( gs_ignoreChangeDeleteItem )
return FALSE;
eventType = wxEVT_COMMAND_LIST_DELETE_ITEM;
event.m_itemIndex = iItem;
// delete the assoicated internal data
@@ -2444,9 +2467,7 @@ static void wxDeleteInternalData(wxListCtrl* ctl, long itemId)
item.iItem = itemId;
item.mask = LVIF_PARAM;
item.lParam = (LPARAM) 0;
gs_deletingItemData = TRUE;
ListView_SetItem((HWND)ctl->GetHWND(), &item);
gs_deletingItemData = FALSE;
}
}