michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #pragma once
michael@0: 
michael@0: #if defined(ACCESSIBILITY)
michael@0: 
michael@0: #include "nsCOMPtr.h"
michael@0: #include "nsIObserver.h"
michael@0: #include "nsIObserverService.h"
michael@0: #include "nsServiceManagerUtils.h"
michael@0: #include "mozilla/a11y/Accessible.h"
michael@0: 
michael@0: #include "mozwrlbase.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace widget {
michael@0: namespace winrt {
michael@0: 
michael@0: // Connects to our accessibility framework to receive
michael@0: // events and query the dom.
michael@0: class AccessibilityBridge : public nsIObserver
michael@0: {
michael@0: public:
michael@0:   NS_DECL_ISUPPORTS
michael@0:   NS_DECL_NSIOBSERVER
michael@0: 
michael@0:   AccessibilityBridge() {}
michael@0: 
michael@0:   ~AccessibilityBridge() {
michael@0:     Disconnect();
michael@0:   }
michael@0: 
michael@0:   bool Init(IUnknown* aBridge, mozilla::a11y::Accessible* aPtr) {
michael@0:     mAccess = aPtr;
michael@0:     mBridge = aBridge;
michael@0:     return Connect();
michael@0:   }
michael@0: 
michael@0:   bool Connect() {
michael@0:     nsresult rv;
michael@0: 
michael@0:     nsCOMPtr<nsIObserverService> observerService = 
michael@0:       do_GetService("@mozilla.org/observer-service;1", &rv);
michael@0:     if (NS_FAILED(rv)) {
michael@0:       return false;
michael@0:     }
michael@0:     rv = observerService->AddObserver(this, "accessible-event", false);
michael@0:     if (NS_FAILED(rv)) {
michael@0:       return false;
michael@0:     }
michael@0:     return true;
michael@0:   }
michael@0: 
michael@0:   bool Connected() {
michael@0:     return mAccess ? true : false;
michael@0:   }
michael@0: 
michael@0:   void Disconnect() {
michael@0:     nsresult rv;
michael@0:     nsCOMPtr<nsIObserverService> observerService = 
michael@0:       do_GetService("@mozilla.org/observer-service;1", &rv);
michael@0:     if (NS_FAILED(rv)) {
michael@0:       NS_WARNING("failed to get observersvc on shutdown.");
michael@0:       return;
michael@0:     }
michael@0:     observerService->RemoveObserver(this, "accessible-event");
michael@0:     mAccess = nullptr;
michael@0:   }
michael@0: 
michael@0: private:
michael@0:   nsRefPtr<mozilla::a11y::Accessible> mAccess;
michael@0:   Microsoft::WRL::ComPtr<IUnknown> mBridge;
michael@0: };
michael@0: 
michael@0: } } }
michael@0: 
michael@0: #endif // ACCESSIBILITY