Bug 1221256: Implement IAccessible::put_accValue for editable text. r=MarcoZ

Differential Revision: https://phabricator.services.mozilla.com/D53378

--HG--
extra : moz-landing-system : lando

accessible/ipc/win/handler/AccessibleHandler.cpp

@@ -914,8 +914,11 @@ AccessibleHandler::put_accName(VARIANT varChild, BSTR szName) {
 
 HRESULT
 AccessibleHandler::put_accValue(VARIANT varChild, BSTR szValue) {
-  // This matches AccessibleWrap
-  return E_NOTIMPL;
+  HRESULT hr = ResolveIA2();
+  if (FAILED(hr)) {
+    return hr;
+  }
+  return mIA2PassThru->put_accValue(varChild, szValue);
 }
 
 /*** IAccessible2 ***/

accessible/windows/msaa/AccessibleWrap.cpp

@@ -1016,7 +1016,25 @@ STDMETHODIMP
 AccessibleWrap::put_accValue(
     /* [optional][in] */ VARIANT varChild,
     /* [in] */ BSTR szValue) {
-  return E_NOTIMPL;
+  RefPtr<IAccessible> accessible;
+  HRESULT hr = ResolveChild(varChild, getter_AddRefs(accessible));
+  if (FAILED(hr)) {
+    return hr;
+  }
+
+  if (accessible) {
+    return accessible->put_accValue(kVarChildIdSelf, szValue);
+  }
+
+  HyperTextAccessible* ht = AsHyperText();
+  if (!ht) {
+    return E_NOTIMPL;
+  }
+
+  uint32_t length = ::SysStringLen(szValue);
+  nsAutoString text(szValue, length);
+  ht->ReplaceText(text);
+  return S_OK;
 }
 
 ////////////////////////////////////////////////////////////////////////////////