plugins/qpa: implement platform accessibility

This allows screen readers to read window titles in a tabbox.

BUG: 472643
FIXED-IN: 5.27.9

src/plugins/qpa/integration.cpp

@@ -7,6 +7,7 @@
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
+
 #include "integration.h"
 #include "backingstore.h"
 #include "eglplatformcontext.h"
@@ -24,6 +25,7 @@
 #include <QTimer>
 #include <QtConcurrentRun>
 
+#include <qpa/qplatformaccessibility.h>
 #include <qpa/qplatformnativeinterface.h>
 #include <qpa/qplatformwindow.h>
 #include <qpa/qwindowsysteminterface.h>
@@ -31,6 +33,7 @@
 #include <QtGui/private/qgenericunixeventdispatcher_p.h>
 #include <QtGui/private/qgenericunixfontdatabase_p.h>
 #include <QtGui/private/qgenericunixthemes_p.h>
+#include <QtGui/private/qspiaccessiblebridge_p.h>
 #include <QtGui/private/qunixeventdispatcher_qpa_p.h>
 
 namespace KWin
@@ -154,6 +157,14 @@ QPlatformOpenGLContext *Integration::createPlatformOpenGLContext(QOpenGLContext
     return nullptr;
 }
 
+QPlatformAccessibility *Integration::accessibility() const
+{
+    if (!m_accessibility) {
+        m_accessibility.reset(new QSpiAccessibleBridge());
+    }
+    return m_accessibility.get();
+}
+
 void Integration::handleWorkspaceCreated()
 {
     connect(workspace(), &Workspace::outputAdded,

src/plugins/qpa/integration.h

@@ -41,6 +41,7 @@ public:
     QStringList themeNames() const override;
     QPlatformTheme *createPlatformTheme(const QString &name) const override;
     QPlatformOpenGLContext *createPlatformOpenGLContext(QOpenGLContext *context) const override;
+    QPlatformAccessibility *accessibility() const override;
     QPlatformNativeInterface *nativeInterface() const override;
     QPlatformServices *services() const override;
     void initialize() override;
@@ -54,6 +55,7 @@ private Q_SLOTS:
 
 private:
     std::unique_ptr<QPlatformFontDatabase> m_fontDb;
+    mutable std::unique_ptr<QPlatformAccessibility> m_accessibility;
     std::unique_ptr<QPlatformNativeInterface> m_nativeInterface;
     QPlatformPlaceholderScreen *m_dummyScreen = nullptr;
     QHash<Output *, Screen *> m_screens;