Propagate the copy event correctly to Qt widgets on WASM

The event should be propagated when the native clipboard is available.
A recent regression caused it to be suppressed, which resulted in lack
of copy/paste capabilities.

Pick-to: 6.4 6.4.0
Change-Id: I030a31aa0951c3813ce1d38da9a6526010b3bfc8
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

src/plugins/platforms/wasm/qwasmclipboard.cpp

@@ -183,6 +183,21 @@ void QWasmClipboard::setMimeData(QMimeData *mimeData, QClipboard::Mode mode)
     isPaste = false;
 }
 
+bool QWasmClipboard::processKeyboard(const QWasmEventTranslator::TranslatedEvent &event,
+                                     const QFlags<Qt::KeyboardModifier> &modifiers)
+{
+    // Clipboard path: cut/copy/paste are handled by clipboard event or direct clipboard
+    // access.
+    if (hasClipboardApi)
+        return false;
+    if (event.type != QEvent::KeyPress || !modifiers.testFlag(Qt::ControlModifier)
+        || (event.key != Qt::Key_C && event.key != Qt::Key_V && event.key != Qt::Key_X)) {
+        return false;
+    }
+    isPaste = event.key == Qt::Key_V;
+    return true;
+}
+
 bool QWasmClipboard::supportsMode(QClipboard::Mode mode) const
 {
     return mode == QClipboard::Clipboard;

src/plugins/platforms/wasm/qwasmclipboard.h

@@ -12,6 +12,8 @@
 #include <emscripten/bind.h>
 #include <emscripten/val.h>
 
+#include "qwasmeventtranslator.h"
+
 QT_BEGIN_NAMESPACE
 
 class QWasmClipboard : public QObject, public QPlatformClipboard
@@ -27,6 +29,8 @@ public:
     bool ownsMode(QClipboard::Mode mode) const override;
 
     static void qWasmClipboardPaste(QMimeData *mData);
+    bool processKeyboard(const QWasmEventTranslator::TranslatedEvent &event,
+                         const QFlags<Qt::KeyboardModifier> &modifiers);
     void initClipboardPermissions();
     void installEventHandlers(const emscripten::val &canvas);
     bool hasClipboardApi;

src/plugins/platforms/wasm/qwasmcompositor.cpp

@@ -829,13 +829,8 @@ bool QWasmCompositor::processKeyboard(int eventType, const EmscriptenKeyboardEve
 
     const QFlags<Qt::KeyboardModifier> modifiers = KeyboardModifier::getForEvent(*emKeyEvent);
 
-    // Clipboard path: cut/copy/paste are handled by clipboard event or direct clipboard access.
+    if (QWasmIntegration::get()->getWasmClipboard()->processKeyboard(translatedEvent, modifiers))
-    if (translatedEvent.type == QEvent::KeyPress && modifiers.testFlag(Qt::ControlModifier)
+        return false;
-        && (translatedEvent.key == Qt::Key_X || translatedEvent.key == Qt::Key_V
-            || translatedEvent.key == Qt::Key_C)) {
-        QWasmIntegration::get()->getWasmClipboard()->isPaste = translatedEvent.key == Qt::Key_V;
-        return false; // continue on to event
-    }
 
     if (translatedEvent.text.isEmpty())
         translatedEvent.text = QString(emKeyEvent->key);