wasm: add clipboard support

This feature uses the js Clipboard API and is supported only in Chrome,
as Firefox only supports reading the clipboard in browser extensions.

It also requires https or localhost access, otherwise access to the
clipboard is blocked by chrome.

Chrome users will be able to copy/paste text to and from the system
clipbaord.
Other browsers will be able to use the clipboard from within the same
application.

Currently only supports text and html.

Task-number: QTBUG-64638
Change-Id: Ie6de9d10812b776519bd6115593b433fe77059fe
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 20 insertions, 3 deletions

diff --git a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
index ea88ef59a0..df81413d5c 100644
--- a/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
+++ b/src/plugins/platforms/wasm/qwasmeventtranslator.cpp
@@ -31,6 +31,7 @@
 #include "qwasmeventdispatcher.h"
 #include "qwasmcompositor.h"
 #include "qwasmintegration.h"
+#include "qwasmclipboard.h"
 
 #include <QtGui/qevent.h>
 #include <qpa/qwindowsysteminterface.h>
@@ -175,10 +176,26 @@ int QWasmEventTranslator::keyboard_cb(int eventType, const EmscriptenKeyboardEve
     if (keyType == QEvent::None)
         return 0;
 
-    QString keyText = alphanumeric ? QString(keyEvent->key) : QString();
-    bool accepted = QWindowSystemInterface::handleKeyEvent<QWindowSystemInterface::SynchronousDelivery>(
-        0, keyType, qtKey, translateKeyboardEventModifier(keyEvent), keyText);
+    QFlags<Qt::KeyboardModifier> mods = translateKeyboardEventModifier(keyEvent);
+    bool accepted = false;
+
+    if (keyType == QEvent::KeyPress &&
+            mods.testFlag(Qt::ControlModifier)
+            && qtKey == Qt::Key_V) {
+        QWasmIntegration::get()->getWasmClipboard()->readTextFromClipboard();
+    } else {
+        QString keyText = alphanumeric ? QString(keyEvent->key) : QString();
+        accepted = QWindowSystemInterface::handleKeyEvent<QWindowSystemInterface::SynchronousDelivery>(
+                    0, keyType, qtKey, translateKeyboardEventModifier(keyEvent), keyText);
+    }
+
+    if (keyType == QEvent::KeyPress &&
+            mods.testFlag(Qt::ControlModifier)
+            && qtKey == Qt::Key_C) {
+        QWasmIntegration::get()->getWasmClipboard()->writeTextToClipboard();
+    }
     QWasmEventDispatcher::maintainTimers();
+
     return accepted ? 1 : 0;
 }