wasm: begin work on accessibility backend

Implement a11y support by adding html elements of the
appropriate type and/or with the appropriate ARIA attribute
behind the canvas.

Also add a simple manual-test.

Change-Id: I2898fb038c1d326135a1341cdee323bc964420bb
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/src/plugins/platforms/wasm/qwasmintegration.h b/src/plugins/platforms/wasm/qwasmintegration.h
index d996ec3065..db1f928f76 100644
--- a/src/plugins/platforms/wasm/qwasmintegration.h
+++ b/src/plugins/platforms/wasm/qwasmintegration.h
@@ -33,6 +33,7 @@ class QWasmScreen;
 class QWasmCompositor;
 class QWasmBackingStore;
 class QWasmClipboard;
+class QWasmAccessibility;
 class QWasmServices;
 
 class QWasmIntegration : public QObject, public QPlatformIntegration
@@ -66,6 +67,9 @@ public:
     QPlatformTheme *createPlatformTheme(const QString &name) const override;
     QPlatformServices *services() const override;
     QPlatformClipboard *clipboard() const override;
+#ifndef QT_NO_ACCESSIBILITY
+    QPlatformAccessibility *accessibility() const override;
+#endif
     void initialize() override;
     QPlatformInputContext *inputContext() const override;
 
@@ -94,6 +98,8 @@ private:
     mutable QHash<QWindow *, QWasmBackingStore *> m_backingStores;
     QList<QPair<emscripten::val, QWasmScreen *>> m_screens;
     mutable QWasmClipboard *m_clipboard;
+    mutable QWasmAccessibility *m_accessibility;
+
     qreal m_fontDpi = -1;
     mutable QScopedPointer<QPlatformInputContext> m_inputContext;
     static QWasmIntegration *s_instance;