wasm: improve clipboard support

Add support for Clipboard API
Add clipboard manual test

Also includes these fixes:

- improve clipboard use for chrome browser
- make QClipboard::setText work
- html copy and paste
- image copy/paste

Chrome browser supports text, html and png

To use the Clipboard API, apps need to be served from
a secure context (https). There is a fallback in the
case of non secure context (http)

- Firefox requires dom.events.asyncClipboard.read,
dom.events.asyncClipboard.clipboardItem and
dom.events.asyncClipboard.dataTransfer to be
set from about:config, in order to support the
Clipboard API.

Change-Id: Ie4cb1bbb1dfc77e9655090a30967632780d15dd9
Fixes: QTBUG-74504
Fixes: QTBUG-93619
Fixes: QTBUG-79365
Fixes: QTBUG-86169
Reviewed-by: Morten Johan Sørvig <morten.sorvig@qt.io>

1 files changed, 7 insertions, 3 deletions

diff --git a/src/plugins/platforms/wasm/qwasmclipboard.h b/src/plugins/platforms/wasm/qwasmclipboard.h
index 3b28e2c381..9a33b79667 100644
--- a/src/plugins/platforms/wasm/qwasmclipboard.h
+++ b/src/plugins/platforms/wasm/qwasmclipboard.h
@@ -51,11 +51,15 @@ public:
     bool ownsMode(QClipboard::Mode mode) const override;
 
     static void qWasmClipboardPaste(QMimeData *mData);
-    void initClipboardEvents();
+    void initClipboardPermissions();
     void installEventHandlers(const emscripten::val &canvas);
     bool hasClipboardApi;
-    void readTextFromClipboard();
-    void writeTextToClipboard();
+    bool hasPermissionsApi;
+    void writeToClipboardApi();
+    void writeToClipboard(const QMimeData *data);
+    bool isPaste;
+    bool m_isListener;
+    bool isSafari;
 };
 
 #endif // QWASMCLIPBOARD_H