summaryrefslogtreecommitdiffstats
path: root/accessible/windows/msaa/EnumVariant.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--accessible/windows/msaa/EnumVariant.cpp90
1 files changed, 90 insertions, 0 deletions
diff --git a/accessible/windows/msaa/EnumVariant.cpp b/accessible/windows/msaa/EnumVariant.cpp
new file mode 100644
index 0000000000..866e8f69a9
--- /dev/null
+++ b/accessible/windows/msaa/EnumVariant.cpp
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "EnumVariant.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+////////////////////////////////////////////////////////////////////////////////
+// ChildrenEnumVariant
+////////////////////////////////////////////////////////////////////////////////
+
+IMPL_IUNKNOWN_QUERY_HEAD(ChildrenEnumVariant)
+IMPL_IUNKNOWN_QUERY_IFACE(IEnumVARIANT)
+IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAnchorMsaa)
+
+STDMETHODIMP
+ChildrenEnumVariant::Next(ULONG aCount, VARIANT FAR* aItems,
+ ULONG FAR* aCountFetched) {
+ if (!aItems || !aCountFetched) return E_INVALIDARG;
+
+ *aCountFetched = 0;
+
+ Accessible* anchor = mAnchorMsaa->Acc();
+ if (!anchor || anchor->ChildAt(mCurIndex) != mCurAcc) {
+ return CO_E_OBJNOTCONNECTED;
+ }
+
+ ULONG countFetched = 0;
+ while (mCurAcc && countFetched < aCount) {
+ VariantInit(aItems + countFetched);
+
+ IDispatch* accNative = MsaaAccessible::NativeAccessible(mCurAcc);
+
+ ++mCurIndex;
+ mCurAcc = anchor->ChildAt(mCurIndex);
+
+ // Don't output the accessible and count it as having been fetched unless
+ // it is non-null
+ MOZ_ASSERT(accNative);
+ if (!accNative) {
+ continue;
+ }
+
+ aItems[countFetched].pdispVal = accNative;
+ aItems[countFetched].vt = VT_DISPATCH;
+ ++countFetched;
+ }
+
+ (*aCountFetched) = countFetched;
+
+ return countFetched < aCount ? S_FALSE : S_OK;
+}
+
+STDMETHODIMP
+ChildrenEnumVariant::Skip(ULONG aCount) {
+ Accessible* anchor = mAnchorMsaa->Acc();
+ if (!anchor || anchor->ChildAt(mCurIndex) != mCurAcc) {
+ return CO_E_OBJNOTCONNECTED;
+ }
+
+ mCurIndex += aCount;
+ mCurAcc = anchor->ChildAt(mCurIndex);
+
+ return mCurAcc ? S_OK : S_FALSE;
+}
+
+STDMETHODIMP
+ChildrenEnumVariant::Reset() {
+ Accessible* anchor = mAnchorMsaa->Acc();
+ if (!anchor) return CO_E_OBJNOTCONNECTED;
+
+ mCurIndex = 0;
+ mCurAcc = anchor->ChildAt(0);
+
+ return S_OK;
+}
+
+STDMETHODIMP
+ChildrenEnumVariant::Clone(IEnumVARIANT** aEnumVariant) {
+ if (!aEnumVariant) return E_INVALIDARG;
+
+ *aEnumVariant = new ChildrenEnumVariant(*this);
+ (*aEnumVariant)->AddRef();
+
+ return S_OK;
+}