From d707acfc9e357ffc86feb5d9219372c30c5ff157 Mon Sep 17 00:00:00 2001
From: Frederik Gladhorn <frederik.gladhorn@digia.com>
Date: Mon, 19 May 2014 12:28:32 +0200
Subject: Accessibility iOS

This lays the foundation for iOS accessibility.
The approach is slightly different from other a11y bridges in
that we completely flaten the hierarchy of wigets/quick items to
a list. This works well with VoiceOver since there are comparatively
few elements. The cache implementation for OS X is re-used.

With this patch VoiceOver on iOS works on many applications out of the box.
For now it sends the screen changed notfification somewhat overzealous,
that will need revisiting and potentially new API in QAccessible.

Device orientation changes are not yet supported.

[ChangeLog][iOS] Accessibility was added to the iOS platform port.
This enables Qt applications to be read by VoiceOver on iOS devices.

Task-number: QTBUG-39097
Change-Id: I441e844652d528cc2fdcc444f43b54ed6fa04f0c
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
---
 .../platforms/ios/qiosplatformaccessibility.mm     | 85 ++++++++++++++++++++++
 1 file changed, 85 insertions(+)
 create mode 100644 src/plugins/platforms/ios/qiosplatformaccessibility.mm

(limited to 'src/plugins/platforms/ios/qiosplatformaccessibility.mm')

diff --git a/src/plugins/platforms/ios/qiosplatformaccessibility.mm b/src/plugins/platforms/ios/qiosplatformaccessibility.mm
new file mode 100644
index 0000000000..db579ba559
--- /dev/null
+++ b/src/plugins/platforms/ios/qiosplatformaccessibility.mm
@@ -0,0 +1,85 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the plugins of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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, Digia gives you certain additional
+** rights.  These rights are described in the Digia 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qiosplatformaccessibility.h"
+
+#include <QtGui/QtGui>
+#include "qioswindow.h"
+
+QIOSPlatformAccessibility::QIOSPlatformAccessibility()
+{}
+
+QIOSPlatformAccessibility::~QIOSPlatformAccessibility()
+{}
+
+
+void invalidateCache(QAccessibleInterface *iface)
+{
+    if (!iface || !iface->isValid()) {
+        qWarning() << "invalid accessible interface: " << iface;
+        return;
+    }
+
+    QWindow *win = 0;
+    QAccessibleInterface *parent = iface;
+    do {
+        win = parent->window();
+        parent = parent->parent();
+    } while (!win && parent);
+    Q_ASSERT(win && win->handle());
+    QIOSWindow *window = static_cast<QIOSWindow*>(win->handle());
+    window->clearAccessibleCache();
+}
+
+
+void QIOSPlatformAccessibility::notifyAccessibilityUpdate(QAccessibleEvent *event)
+{
+    switch (event->type()) {
+    case QAccessible::ObjectCreated:
+    case QAccessible::ObjectShow:
+    case QAccessible::ObjectHide:
+    case QAccessible::ObjectDestroyed:
+        invalidateCache(event->accessibleInterface());
+        break;
+    default:
+        break;
+    }
+}
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