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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) {}
AccessibleWrap::~AccessibleWrap() = default;
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 UpdateSystemCaretForHwnd(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);
}
}
/* 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));
UpdateSystemCaretForHwnd(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();
UpdateSystemCaretForHwnd(MsaaAccessible::GetHWNDFor(outerDoc), aCaretRect);
}
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