How to made JAWS readout ListView Item use Server Annotation - c++

Question

I have write a windows client, which UI framework is ATL/WTL. And There is a ListView (CListViewCtrl in ATL) with LVS_OWNERDRAWFIXED style.
For support Accessibility tool JAWS.I Want Jaws read ListView item.
I follow the doc:https://learn.microsoft.com/en-us/windows/win32/winauto/server-annotation-sample
0.Impl of IAccPropServer for support GetPropValue .
class ListViewAccServer : public IAccPropServer
{
ULONG m_Ref;
IAccPropServices * m_pAccPropSvc;
public:
/* skip over ListViewAccServer/ ~ListViewAccServer
*/
static ListViewAccServer * CreateProvider(HWND hControl)
{
ATL::CComPtr<IAccPropServices> pAccPropSvc;
HRESULT hr = pAccPropSvc.CoCreateInstance(CLSID_AccPropServices, NULL, CLSCTX_SERVER);
if (hr == S_OK && pAccPropSvc)
{
ListViewAccServer * pLVServer = new (std::nothrow) ListViewAccServer(pAccPropSvc);
if (pLVServer)
{
MSAAPROPID propid = PROPID_ACC_NAME;
//pAccPropSvc->SetHwndPropServer(hControl, (DWORD)OBJID_CLIENT, CHILDID_SELF, &propid, 1, pLVServer, ANNO_CONTAINER);
pAccPropSvc->SetHwndPropServer(hControl, (DWORD)OBJID_CLIENT, CHILDID_SELF, &propid, 1, pLVServer, ANNO_CONTAINER);
pLVServer->Release();
}
return pLVServer;
}
return NULL;
}
/* skip over: Addref/Release/QI
*/
HRESULT STDMETHODCALLTYPE GetPropValue(const BYTE * pIDString,
DWORD dwIDStringLen, MSAAPROPID idProp, VARIANT * pvarValue,
BOOL * pfGotProp)
{
if (!pfGotProp)
return E_POINTER;
pvarValue->vt = VT_EMPTY;
*pfGotProp = FALSE;
//HWND hwnd;
DWORD idObject;
DWORD idChild;
HWND dwHcontrol;
if (S_OK != m_pAccPropSvc->DecomposeHwndIdentityString(pIDString,
dwIDStringLen, &dwHcontrol, &idObject, &idChild))
{
return S_OK;
}
HWND Hwnd = dwHcontrol;
// Only supply name string for child elements, not the listview itself
if (idChild != CHILDID_SELF)
{
if (idProp == PROPID_ACC_NAME)//Jaws should read acc name?
{
CString str;
str.Format(L"Line index %d", idChild);
OutputDebugPrintfW(_T("GetPropValue str =%s\n"), str);
BSTR bstr = ::SysAllocString((LPCTSTR)str.GetString());
pvarValue->vt = VT_BSTR;
pvarValue->bstrVal = bstr;
*pfGotProp = TRUE;
}
}
return S_OK;
}
};
1.initUI
//if Set 'LVS_OWNERDRAWFIXED',JAWS will read onDraw Item "Dummy List Item"
m_lvMain.Create(m_hWnd, rc, NULL,
WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN |
LVS_REPORT | LVS_AUTOARRANGE | LVS_SHOWSELALWAYS | LVS_SHAREIMAGELISTS | WS_TABSTOP|LVS_OWNERDRAWFIXED,
WS_EX_CLIENTEDGE, LIST_ID);
/*
m_lvMain.Create(m_hWnd, rc, NULL,
WS_CHILD | WS_VISIBLE | WS_CLIPSIBLINGS | WS_CLIPCHILDREN |
LVS_REPORT | LVS_AUTOARRANGE | LVS_SHOWSELALWAYS | LVS_SHAREIMAGELISTS | WS_TABSTOP ,
WS_EX_CLIENTEDGE, LIST_ID);
*/
//otherwise JAWS will read Hello,Hello1,Hello2...
m_lvMain.InsertColumn(0, _T("Column"), LVCFMT_LEFT, 200);
m_lvMain.InsertItem(0, _T("Hello"));
m_lvMain.InsertItem(0, _T("Hello1"));
m_lvMain.InsertItem(0, _T("Hello2"));
m_lvMain.InsertItem(0, _T("Hello3"));
2.Bind Listview m_hwnd with ListViewAccServer
m_pAccServer = ListViewAccServer::CreateProvider(m_lvMain.m_hWnd);
3
LRESULT OnDrawItem(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
//LRESULT onDraw(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
LPDRAWITEMSTRUCT pDIS = (LPDRAWITEMSTRUCT)(lParam);
//OutputDebugPrintfW(_T("OnDrawItem i = %d, %d, %08x \n"), pDIS->itemID, pDIS->itemData, pDIS->hwndItem);
BOOL bSelected = ((pDIS->itemState & ODS_SELECTED) == ODS_SELECTED);
BOOL bFocus = ((pDIS->itemState & ODS_FOCUS) == ODS_FOCUS);
HDC hDC = pDIS->hDC;
RECT rc = pDIS->rcItem;
HBRUSH bg = (HBRUSH)(::GetStockObject(WHITE_BRUSH));
if (bSelected)
{
bg = (HBRUSH)(::GetStockObject(LTGRAY_BRUSH));
}
if (bFocus)
{
bg = (HBRUSH)(::GetStockObject(LTGRAY_BRUSH));
}
HPEN pn = (HPEN)(::GetStockObject(BLACK_PEN));
::SelectObject(hDC, bg);
::SelectObject(hDC, pn);
::SetTextColor(hDC, RGB(0, 0, 0));
const wchar_t *text = L"Dummy List Item";
::Rectangle(hDC, rc.left, rc.top, rc.right, rc.bottom);
::DrawText(hDC, text, wcslen(text), &rc, DT_SINGLELINE | DT_VCENTER);
return S_OK;
}
When use UP and down array By Keyboard alert in ListView items.I want Jaws read out "Line index i" in GetPropValue.
But
1: If I set ListView with style:LVS_OWNERDRAWFIXED.On some PC, Jaws will read out "Dummy List Item". On Some PC, It read nothing.
2: If remove style:LVS_OWNERDRAWFIXED. Jaws will read out 'Hello','Hello1'...
both 1 or 2 do not read out GetPropValue give string"Line index i".
The log shows GetPropValue is be called:
GetPropValue str =Line index 1
GetPropValue str =Line index 2
My test PC machine OSs are Win10,Win7
So what's the problem?
Thanks a lot.
PS:At last , I found this:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=73496
I can use Insert+6 to bring up the JAWS Configuration Manager.
- click OK to Add a New Configuration (for your application)
- in the Configuration Manager dialog, type "listv" in the filter to see the page containing the "Rely on MSAA for ListViews" checkbox.
- check "Rely on MSAA for ListViews"
- click OK to save and exit the Configuration Manager.
So Jaws default do not use MSAA to get information?