Add Linux Accessibility Bridge

This is a plugin that bridges the QAccessible world
to AT-SPI 2 on Linux.

Change-Id: I7af22621ee6a3cefc723b137b7f227a611cf6641
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>

1 files changed, 219 insertions, 0 deletions

diff --git a/src/platformsupport/linuxaccessibility/application.cpp b/src/platformsupport/linuxaccessibility/application.cpp
new file mode 100644
index 0000000000..84f5cef625
--- /dev/null
+++ b/src/platformsupport/linuxaccessibility/application.cpp
@@ -0,0 +1,219 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** 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 "application_p.h"
+
+#include <QtWidgets/qapplication.h>
+#include <QtDBus/qdbuspendingreply.h>
+#include <qdebug.h>
+
+#include "deviceeventcontroller_adaptor.h"
+
+//#define KEYBOARD_DEBUG
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QSpiApplicationAdaptor
+
+    \brief QSpiApplicationAdaptor
+
+    QSpiApplicationAdaptor
+*/
+
+QSpiApplicationAdaptor::QSpiApplicationAdaptor(const QDBusConnection &connection, QObject *parent)
+    : QObject(parent), dbusConnection(connection)
+{
+}
+
+enum QSpiKeyEventType {
+      QSPI_KEY_EVENT_PRESS,
+      QSPI_KEY_EVENT_RELEASE,
+      QSPI_KEY_EVENT_LAST_DEFINED
+};
+
+void QSpiApplicationAdaptor::sendEvents(bool active)
+{
+    if (active) {
+        qApp->installEventFilter(this);
+    } else {
+        qApp->removeEventFilter(this);
+    }
+}
+
+
+bool QSpiApplicationAdaptor::eventFilter(QObject *target, QEvent *event)
+{
+    if (!event->spontaneous())
+        return false;
+
+    switch (event->type()) {
+    case QEvent::WindowActivate:
+        emit windowActivated(target, true);
+        break;
+    case QEvent::WindowDeactivate:
+        emit windowActivated(target, false);
+        break;
+    case QEvent::KeyPress:
+    case QEvent::KeyRelease: {
+        QKeyEvent *keyEvent = static_cast <QKeyEvent *>(event);
+        QSpiDeviceEvent de;
+
+        if (event->type() == QEvent::KeyPress)
+            de.type = QSPI_KEY_EVENT_PRESS;
+        else
+            de.type = QSPI_KEY_EVENT_RELEASE;
+
+        de.id = keyEvent->nativeVirtualKey();
+        de.hardwareCode = keyEvent->nativeScanCode();
+
+        de.modifiers = keyEvent->nativeModifiers();
+        de.timestamp = QDateTime::currentMSecsSinceEpoch();
+
+        if (keyEvent->key() == Qt::Key_Tab)
+            de.text = QStringLiteral("Tab");
+        else if (keyEvent->key() == Qt::Key_Backtab)
+            de.text = QStringLiteral("Backtab");
+        else if (keyEvent->key() == Qt::Key_Left)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Left") : QStringLiteral("Left");
+        else if (keyEvent->key() == Qt::Key_Right)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Right") : QStringLiteral("Right");
+        else if (keyEvent->key() == Qt::Key_Up)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Up") : QStringLiteral("Up");
+        else if (keyEvent->key() == Qt::Key_Down)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Down") : QStringLiteral("Down");
+        else if (keyEvent->key() == Qt::Key_Enter || keyEvent->key() == Qt::Key_Return)
+            de.text = QStringLiteral("Return");
+        else if (keyEvent->key() == Qt::Key_Backspace)
+            de.text = QStringLiteral("BackSpace");
+        else if (keyEvent->key() == Qt::Key_Delete)
+            de.text = QStringLiteral("Delete");
+        else if (keyEvent->key() == Qt::Key_PageUp)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Page_Up") : QStringLiteral("Page_Up");
+        else if (keyEvent->key() == Qt::Key_PageDown)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Page_Up") : QStringLiteral("Page_Down");
+        else if (keyEvent->key() == Qt::Key_Home)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_Home") : QStringLiteral("Home");
+        else if (keyEvent->key() == Qt::Key_End)
+            de.text = (keyEvent->modifiers() & Qt::KeypadModifier) ? QStringLiteral("KP_End") : QStringLiteral("End");
+        else if (keyEvent->key() == Qt::Key_Clear && (keyEvent->modifiers() & Qt::KeypadModifier))
+            de.text = QStringLiteral("KP_Begin"); // Key pad 5
+        else if (keyEvent->key() == Qt::Key_Escape)
+            de.text = QStringLiteral("Escape");
+        else if (keyEvent->key() == Qt::Key_Space)
+            de.text = QStringLiteral("space");
+        else if (keyEvent->key() == Qt::Key_CapsLock)
+            de.text = QStringLiteral("Caps_Lock");
+        else if (keyEvent->key() == Qt::Key_NumLock)
+            de.text = QStringLiteral("Num_Lock");
+        else if (keyEvent->key() == Qt::Key_Insert)
+            de.text = QStringLiteral("Insert");
+        else
+            de.text = keyEvent->text();
+
+        // This is a bit dubious, Gnome uses some gtk function here.
+        // Long term the spec will hopefully change to just use keycodes.
+        de.isText = !de.text.isEmpty();
+
+#ifdef KEYBOARD_DEBUG
+        qDebug() << QStringLiteral("Key event text: ") << event->type() << de.isText << QStringLiteral(" ") << de.text
+                 << QStringLiteral(" hardware code: ") << de.hardwareCode
+                 << QStringLiteral(" native sc: ") << keyEvent->nativeScanCode()
+                 << QStringLiteral(" native mod: ") << keyEvent->nativeModifiers()
+                 << QStringLiteral("native virt: ") << keyEvent->nativeVirtualKey();
+#endif
+
+        QDBusMessage m = QDBusMessage::createMethodCall(QStringLiteral("org.a11y.atspi.Registry"),
+                                                        QStringLiteral("/org/a11y/atspi/registry/deviceeventcontroller"),
+                                                        QStringLiteral("org.a11y.atspi.DeviceEventController"), QStringLiteral("NotifyListenersSync"));
+        m.setArguments(QVariantList() <<QVariant::fromValue(de));
+
+        // FIXME: this is critical, the timeout should probably be pretty low to allow normal processing
+        int timeout = 100;
+        bool sent = dbusConnection.callWithCallback(m, this, SLOT(notifyKeyboardListenerCallback(QDBusMessage)),
+                        SLOT(notifyKeyboardListenerError(QDBusError, QDBusMessage)), timeout);
+        if (sent) {
+            //queue the event and send it after callback
+            keyEvents.enqueue(QPair<QObject*, QKeyEvent*> (target, copyKeyEvent(keyEvent)));
+#ifdef KEYBOARD_DEBUG
+            qDebug() << QStringLiteral("Sent key: ") << de.text;
+#endif
+            return true;
+        }
+    }
+    default:
+        break;
+    }
+    return false;
+}
+
+QKeyEvent* QSpiApplicationAdaptor::copyKeyEvent(QKeyEvent* old)
+{
+    return new QKeyEvent(old->type(), old->key(), old->modifiers(), old->text(), old->isAutoRepeat(), old->count());
+}
+
+void QSpiApplicationAdaptor::notifyKeyboardListenerCallback(const QDBusMessage& message)
+{
+    if (!keyEvents.length()) {
+        qWarning() << QStringLiteral("QSpiApplication::notifyKeyboardListenerCallback with no queued key called");
+        return;
+    }
+    Q_ASSERT(message.arguments().length() == 1);
+    if (message.arguments().at(0).toBool() == true) {
+        QPair<QObject*, QKeyEvent*> event = keyEvents.dequeue();
+        delete event.second;
+    } else {
+        QPair<QObject*, QKeyEvent*> event = keyEvents.dequeue();
+        QApplication::postEvent(event.first, event.second);
+    }
+}
+
+void QSpiApplicationAdaptor::notifyKeyboardListenerError(const QDBusError& error, const QDBusMessage& /*message*/)
+{
+    qWarning() << QStringLiteral("QSpiApplication::keyEventError ") << error.name() << error.message();
+    while (!keyEvents.isEmpty()) {
+        QPair<QObject*, QKeyEvent*> event = keyEvents.dequeue();
+        QApplication::postEvent(event.first, event.second);
+    }
+}
+
+QT_END_NAMESPACE