STDMETHODIMP
nsAccessNodeWrap::QueryService(REFGUID guidService, REFIID iid, void** ppv)
{
// Can get to IAccessibleApplication from any node via QS
if (iid == IID_IAccessibleApplication) {
nsRefPtr<nsApplicationAccessibleWrap> app =
GetApplicationAccessible();
nsresult rv = app->QueryNativeInterface(iid, ppv);
return NS_SUCCEEDED(rv) ? S_OK : E_NOINTERFACE;
}
/**
* To get an ISimpleDOMNode, ISimpleDOMDocument, ISimpleDOMText
* or any IAccessible2 interface on should use IServiceProvider like this:
* -----------------------------------------------------------------------
* ISimpleDOMDocument *pAccDoc = NULL;
* IServiceProvider *pServProv = NULL;
* pAcc->QueryInterface(IID_IServiceProvider, (void**)&pServProv);
* if (pServProv) {
* const GUID unused;
* pServProv->QueryService(unused, IID_ISimpleDOMDocument, (void**)&pAccDoc);
* pServProv->Release();
* }
*/
return QueryInterface(iid, ppv);
}
STDMETHODIMP
nsAccessNodeWrap::QueryService(REFGUID guidService, REFIID iid, void** ppv)
{
static const GUID IID_SimpleDOMDeprecated = {0x0c539790,0x12e4,0x11cf,0xb6,0x61,0x00,0xaa,0x00,0x4c,0xd6,0xd8};
if (guidService != IID_ISimpleDOMNode &&
guidService != IID_SimpleDOMDeprecated &&
guidService != IID_IAccessible && guidService != IID_IAccessible2 &&
guidService != IID_IAccessibleApplication)
return E_INVALIDARG;
// Can get to IAccessibleApplication from any node via QS
if (iid == IID_IAccessibleApplication) {
nsApplicationAccessible *applicationAcc = GetApplicationAccessible();
if (!applicationAcc)
return E_NOINTERFACE;
nsresult rv = applicationAcc->QueryNativeInterface(iid, ppv);
return NS_SUCCEEDED(rv) ? S_OK : E_NOINTERFACE;
}
/**
* To get an ISimpleDOMNode, ISimpleDOMDocument, ISimpleDOMText
* or any IAccessible2 interface on should use IServiceProvider like this:
* -----------------------------------------------------------------------
* ISimpleDOMDocument *pAccDoc = NULL;
* IServiceProvider *pServProv = NULL;
* pAcc->QueryInterface(IID_IServiceProvider, (void**)&pServProv);
* if (pServProv) {
* const GUID unused;
* pServProv->QueryService(unused, IID_ISimpleDOMDocument, (void**)&pAccDoc);
* pServProv->Release();
* }
*/
return QueryInterface(iid, ppv);
}
STDMETHODIMP
nsAccessNodeWrap::QueryService(REFGUID guidService, REFIID iid, void** ppv)
{
*ppv = nsnull;
static const GUID IID_SimpleDOMDeprecated = {0x0c539790,0x12e4,0x11cf,0xb6,0x61,0x00,0xaa,0x00,0x4c,0xd6,0xd8};
// Provide a special service ID for getting the accessible for the browser tab
// document that contains this accessible object. If this accessible object
// is not inside a browser tab then the service fails with E_NOINTERFACE.
// A use case for this is for screen readers that need to switch context or
// 'virtual buffer' when focus moves from one browser tab area to another.
static const GUID SID_IAccessibleContentDocument = {0xa5d8e1f3,0x3571,0x4d8f,0x95,0x21,0x07,0xed,0x28,0xfb,0x07,0x2e};
if (guidService != IID_ISimpleDOMNode &&
guidService != IID_SimpleDOMDeprecated &&
guidService != IID_IAccessible && guidService != IID_IAccessible2 &&
guidService != IID_IAccessibleApplication &&
guidService != SID_IAccessibleContentDocument)
return E_INVALIDARG;
if (guidService == SID_IAccessibleContentDocument) {
if (iid != IID_IAccessible)
return E_NOINTERFACE;
nsCOMPtr<nsIDocShellTreeItem> docShellTreeItem =
nsCoreUtils::GetDocShellTreeItemFor(mContent);
if (!docShellTreeItem)
return E_UNEXPECTED;
// Walk up the parent chain without crossing the boundary at which item
// types change, preventing us from walking up out of tab content.
nsCOMPtr<nsIDocShellTreeItem> root;
docShellTreeItem->GetSameTypeRootTreeItem(getter_AddRefs(root));
if (!root)
return E_UNEXPECTED;
// If the item type is typeContent, we assume we are in browser tab content.
// Note this includes content such as about:addons, for consistency.
PRInt32 itemType;
root->GetItemType(&itemType);
if (itemType != nsIDocShellTreeItem::typeContent)
return E_NOINTERFACE;
// Make sure this is a document.
nsDocAccessible* docAcc = nsAccUtils::GetDocAccessibleFor(root);
if (!docAcc)
return E_UNEXPECTED;
*ppv = static_cast<IAccessible*>(docAcc);
(reinterpret_cast<IUnknown*>(*ppv))->AddRef();
return NS_OK;
}
// Can get to IAccessibleApplication from any node via QS
if (iid == IID_IAccessibleApplication) {
nsApplicationAccessible *applicationAcc = GetApplicationAccessible();
if (!applicationAcc)
return E_NOINTERFACE;
nsresult rv = applicationAcc->QueryNativeInterface(iid, ppv);
return NS_SUCCEEDED(rv) ? S_OK : E_NOINTERFACE;
}
/**
* To get an ISimpleDOMNode, ISimpleDOMDocument, ISimpleDOMText
* or any IAccessible2 interface on should use IServiceProvider like this:
* -----------------------------------------------------------------------
* ISimpleDOMDocument *pAccDoc = NULL;
* IServiceProvider *pServProv = NULL;
* pAcc->QueryInterface(IID_IServiceProvider, (void**)&pServProv);
* if (pServProv) {
* const GUID unused;
* pServProv->QueryService(unused, IID_ISimpleDOMDocument, (void**)&pAccDoc);
* pServProv->Release();
* }
*/
return QueryInterface(iid, ppv);
}
