Refactor accessibility for Qt5

* Moved most stuff to gui\accessible
* Moved widget-specific stuff to widgets\accessible
* Moved platform-specific code to either the bridge plugin (this was already the case)
  or to the platform plugin.
* Added several classes and functions. These have not yet gone through an API
  review. The plan is to do that in a later commit.
  Classes:
   - QPlatformAccessibility
   - QWindowsAccessibility
  Functions:
   - QWindow *QAccessibleInterface::window();
   - QPlatformAccessibility *QPlatformIntegration::accessibility()

* The bridge code can now either be a plugin or integrated into the platform plugin
* Mac accessibility is left out for now. Unix "should still work" (tm). These platforms
  should be fixed soon.

Change-Id: Ib49ffa73b647ee0af90864544c2769440157f562
Reviewed-on: http://codereview.qt-project.org/5330
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@nokia.com>
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/src/gui/accessible/qplatformaccessibility_qpa.cpp b/src/gui/accessible/qplatformaccessibility_qpa.cpp
new file mode 100644
index 0000000000..f912907db3
--- /dev/null
+++ b/src/gui/accessible/qplatformaccessibility_qpa.cpp
@@ -0,0 +1,148 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qplatformaccessibility_qpa.h"
+#include <private/qfactoryloader_p.h>
+#include "qaccessibleplugin.h"
+#include "qaccessibleobject.h"
+#include "qaccessiblebridge.h"
+#include <QtGui/QGuiApplication>
+
+/* accessiblebridge plugin discovery stuff */
+#ifndef QT_NO_LIBRARY
+Q_GLOBAL_STATIC_WITH_ARGS(QFactoryLoader, bridgeloader,
+    (QAccessibleBridgeFactoryInterface_iid, QLatin1String("/accessiblebridge")))
+#endif
+
+Q_GLOBAL_STATIC(QVector<QAccessibleBridge *>, bridges)
+
+/*!
+    \class QPlatformAccessibility
+    \brief The QPlatformAccessibility class is the base class for
+    integrating accessibility backends
+
+    \preliminary
+    \ingroup accessibility
+
+    \sa QAccessible
+*/
+QPlatformAccessibility::QPlatformAccessibility()
+{
+}
+
+QPlatformAccessibility::~QPlatformAccessibility()
+{
+}
+
+void QPlatformAccessibility::notifyAccessibilityUpdate(QObject *o,
+                                                       int who,
+                                                       QAccessible::Event reason)
+{
+    initialize();
+
+    if (!bridges() || bridges()->isEmpty())
+        return;
+
+    QAccessibleInterface *iface = QAccessible::queryAccessibleInterface(o);
+    if (!iface)
+        return;
+
+    // updates for List/Table/Tree should send child
+    if (who) {
+        QAccessibleInterface *child;
+        iface->navigate(QAccessible::Child, who, &child);
+        if (child) {
+            delete iface;
+            iface = child;
+            who = 0;
+        }
+    }
+
+    for (int i = 0; i < bridges()->count(); ++i)
+        bridges()->at(i)->notifyAccessibilityUpdate(reason, iface, who);
+    delete iface;
+
+}
+
+void QPlatformAccessibility::setRootObject(QObject *o)
+{
+    initialize();
+    if (bridges()->isEmpty())
+        return;
+
+    if (!o)
+        return;
+
+    for (int i = 0; i < bridges()->count(); ++i) {
+        QAccessibleInterface *iface = QAccessible::queryAccessibleInterface(o);
+        bridges()->at(i)->setRootObject(iface);
+    }
+}
+
+void QPlatformAccessibility::initialize()
+{
+    static bool isInit = false;
+    if (isInit)
+        return;
+    isInit = true;      // ### not atomic
+#ifdef Q_OS_UNIX
+    if (qgetenv("QT_ACCESSIBILITY") != "1")
+        return;
+#endif
+#ifndef QT_NO_LIBRARY
+    const QStringList l = bridgeloader()->keys();
+    for (int i = 0; i < l.count(); ++i) {
+        if (QAccessibleBridgeFactoryInterface *factory =
+                qobject_cast<QAccessibleBridgeFactoryInterface*>(bridgeloader()->instance(l.at(i)))) {
+            QAccessibleBridge * bridge = factory->create(l.at(i));
+            if (bridge) {
+                bridges()->append(bridge);
+#
+            }
+        }
+    }
+#endif
+}
+
+void QPlatformAccessibility::cleanup()
+{
+    qDeleteAll(*bridges());
+}
+