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Bug 594413 - Provide QueryService for main tab document accessible; r=marcoz,surkov a=blocking-b7

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This commit is contained in:
David Bolter 2010-09-27 15:01:31 -04:00
parent 334689c512
commit aaf6c6df6a
1 changed files with 47 additions and 1 deletions
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48
accessible/src/msaa/nsAccessNodeWrap.cpp
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@ -134,13 +134,59 @@ STDMETHODIMP nsAccessNodeWrap::QueryInterface(REFIID iid, void** 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 != 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();