gecko-dev/widget/windows/winrt/UIAAccessibilityBridge.h

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#pragma once
#if defined(ACCESSIBILITY)
#include "nsCOMPtr.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsServiceManagerUtils.h"
#include "mozilla/a11y/Accessible.h"
#include "mozwrlbase.h"
namespace mozilla {
namespace widget {
namespace winrt {
// Connects to our accessibility framework to receive
// events and query the dom.
class AccessibilityBridge : public nsIObserver
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
AccessibilityBridge() {}
~AccessibilityBridge() {
Disconnect();
}
bool Init(IUnknown* aBridge, mozilla::a11y::Accessible* aPtr) {
mAccess = aPtr;
mBridge = aBridge;
return Connect();
}
bool Connect() {
nsresult rv;
nsCOMPtr<nsIObserverService> observerService =
do_GetService("@mozilla.org/observer-service;1", &rv);
if (NS_FAILED(rv)) {
return false;
}
rv = observerService->AddObserver(this, "accessible-event", false);
if (NS_FAILED(rv)) {
return false;
}
return true;
}
bool Connected() {
return mAccess ? true : false;
}
void Disconnect() {
nsresult rv;
nsCOMPtr<nsIObserverService> observerService =
do_GetService("@mozilla.org/observer-service;1", &rv);
if (NS_FAILED(rv)) {
NS_WARNING("failed to get observersvc on shutdown.");
return;
}
observerService->RemoveObserver(this, "accessible-event");
mAccess = nullptr;
}
private:
nsRefPtr<mozilla::a11y::Accessible> mAccess;
Microsoft::WRL::ComPtr<IUnknown> mBridge;
};
} } }
#endif // ACCESSIBILITY