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/* -*- 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);
}
////////////////////////////////////////////////////////////////////////////////
// LocalAccessible
nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
nsresult rv = LocalAccessible::HandleAccEvent(aEvent);
NS_ENSURE_SUCCESS(rv, rv);
if (IPCAccessibilityActive()) {
return NS_OK;
}
uint32_t eventType = aEvent->GetEventType();
// Means we're not active.
NS_ENSURE_TRUE(!IsDefunct(), NS_ERROR_FAILURE);
LocalAccessible* accessible = aEvent->GetAccessible();
if (!accessible) return NS_OK;
if (eventType == nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED ||
eventType == nsIAccessibleEvent::EVENT_FOCUS) {
UpdateSystemCaretFor(accessible);
}
MsaaAccessible::FireWinEvent(accessible, eventType);
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// 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;
}
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);
}
}
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