summaryrefslogtreecommitdiffstats
path: root/accessible/windows/msaa/AccessibleWrap.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'accessible/windows/msaa/AccessibleWrap.cpp')
-rw-r--r--accessible/windows/msaa/AccessibleWrap.cpp140
1 files changed, 140 insertions, 0 deletions
diff --git a/accessible/windows/msaa/AccessibleWrap.cpp b/accessible/windows/msaa/AccessibleWrap.cpp
new file mode 100644
index 0000000000..abab007775
--- /dev/null
+++ b/accessible/windows/msaa/AccessibleWrap.cpp
@@ -0,0 +1,140 @@
+/* -*- 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 "AccessibleWrap.h"
+
+#include "mozilla/a11y/DocAccessibleParent.h"
+#include "AccEvent.h"
+#include "nsAccUtils.h"
+#include "nsIAccessibleEvent.h"
+#include "nsIWidget.h"
+#include "nsWindowsHelpers.h"
+#include "mozilla/a11y/HyperTextAccessible.h"
+#include "mozilla/a11y/RemoteAccessible.h"
+#include "ServiceProvider.h"
+#include "sdnAccessible.h"
+#include "LocalAccessible-inl.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+
+/* For documentation of the accessibility architecture,
+ * see http://lxr.mozilla.org/seamonkey/source/accessible/accessible-docs.html
+ */
+
+////////////////////////////////////////////////////////////////////////////////
+// AccessibleWrap
+////////////////////////////////////////////////////////////////////////////////
+AccessibleWrap::AccessibleWrap(nsIContent* aContent, DocAccessible* aDoc)
+ : LocalAccessible(aContent, aDoc) {}
+
+NS_IMPL_ISUPPORTS_INHERITED0(AccessibleWrap, LocalAccessible)
+
+void AccessibleWrap::Shutdown() {
+ if (mMsaa) {
+ mMsaa->MsaaShutdown();
+ // Don't release mMsaa here because this will cause its id to be released
+ // immediately, which will result in immediate reuse, causing problems
+ // for clients. Instead, we release it in the destructor.
+ }
+ LocalAccessible::Shutdown();
+}
+
+//-----------------------------------------------------
+// IUnknown interface methods - see iunknown.h for documentation
+//-----------------------------------------------------
+
+MsaaAccessible* AccessibleWrap::GetMsaa() {
+ if (!mMsaa) {
+ mMsaa = MsaaAccessible::Create(this);
+ }
+ return mMsaa;
+}
+
+void AccessibleWrap::GetNativeInterface(void** aOutAccessible) {
+ RefPtr<IAccessible> result = GetMsaa();
+ return result.forget(aOutAccessible);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// AccessibleWrap
+
+//------- Helper methods ---------
+
+bool AccessibleWrap::IsRootForHWND() {
+ if (IsRoot()) {
+ return true;
+ }
+ HWND thisHwnd = MsaaAccessible::GetHWNDFor(this);
+ AccessibleWrap* parent = static_cast<AccessibleWrap*>(LocalParent());
+ MOZ_ASSERT(parent);
+ HWND parentHwnd = MsaaAccessible::GetHWNDFor(parent);
+ return thisHwnd != parentHwnd;
+}
+
+/* static */
+void AccessibleWrap::UpdateSystemCaretFor(
+ Accessible* aAccessible, const LayoutDeviceIntRect& aCaretRect) {
+ if (LocalAccessible* localAcc = aAccessible->AsLocal()) {
+ // XXX We need the widget for LocalAccessible, so we have to call
+ // HyperTextAccessible::GetCaretRect. We should find some way of avoiding
+ // the need for the widget.
+ UpdateSystemCaretFor(localAcc);
+ } else {
+ UpdateSystemCaretFor(aAccessible->AsRemote(), aCaretRect);
+ }
+}
+
+/* static */
+void AccessibleWrap::UpdateSystemCaretFor(LocalAccessible* aAccessible) {
+ // Move the system caret so that Windows Tablet Edition and tradional ATs with
+ // off-screen model can follow the caret
+ ::DestroyCaret();
+
+ HyperTextAccessible* text = aAccessible->AsHyperText();
+ if (!text) return;
+
+ nsIWidget* widget = nullptr;
+ LayoutDeviceIntRect caretRect = text->GetCaretRect(&widget);
+
+ if (!widget) {
+ return;
+ }
+
+ HWND caretWnd =
+ reinterpret_cast<HWND>(widget->GetNativeData(NS_NATIVE_WINDOW));
+ UpdateSystemCaretFor(caretWnd, caretRect);
+}
+
+/* static */
+void AccessibleWrap::UpdateSystemCaretFor(
+ RemoteAccessible* aProxy, const LayoutDeviceIntRect& aCaretRect) {
+ ::DestroyCaret();
+
+ // The HWND should be the real widget HWND, not an emulated HWND.
+ // We get the HWND from the proxy's outer doc to bypass window emulation.
+ LocalAccessible* outerDoc = aProxy->OuterDocOfRemoteBrowser();
+ UpdateSystemCaretFor(MsaaAccessible::GetHWNDFor(outerDoc), aCaretRect);
+}
+
+/* static */
+void AccessibleWrap::UpdateSystemCaretFor(
+ HWND aCaretWnd, const LayoutDeviceIntRect& aCaretRect) {
+ if (!aCaretWnd || aCaretRect.IsEmpty()) {
+ return;
+ }
+
+ // Create invisible bitmap for caret, otherwise its appearance interferes
+ // with Gecko caret
+ nsAutoBitmap caretBitMap(CreateBitmap(1, aCaretRect.Height(), 1, 1, nullptr));
+ if (::CreateCaret(aCaretWnd, caretBitMap, 1,
+ aCaretRect.Height())) { // Also destroys the last caret
+ ::ShowCaret(aCaretWnd);
+ POINT clientPoint{aCaretRect.X(), aCaretRect.Y()};
+ ::ScreenToClient(aCaretWnd, &clientPoint);
+ ::SetCaretPos(clientPoint.x, clientPoint.y);
+ }
+}