WASM Qt: various EMSCRIPTEN adaptions

* Don't create a native window handle
* Use a static QMimeData for non-working clipboard
* Use Qt::Tooltip for LO's popup windows

Change-Id: I6b6edfa26466814cb0500116098eafcbe41bba26
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/128587
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>

4 files changed, 22 insertions, 3 deletions

diff --git a/include/vcl/sysdata.hxx b/include/vcl/sysdata.hxx
index 57d9c2220ecf..00cd5142c2e3 100644
--- a/include/vcl/sysdata.hxx
+++ b/include/vcl/sysdata.hxx
@@ -62,7 +62,7 @@ struct VCL_DLLPUBLIC SystemEnvData
 #elif defined( IOS )
     // Nothing
 #elif defined( UNX )
-    enum class Platform { Wayland, Xcb };
+    enum class Platform { Wayland, Xcb, WASM };
 
     void*               pDisplay;       // the relevant display connection
     SalFrame*           pSalFrame;      // contains a salframe, if object has one
diff --git a/vcl/qt5/QtClipboard.cxx b/vcl/qt5/QtClipboard.cxx
index 55977d36642a..5d1a167a92a2 100644
--- a/vcl/qt5/QtClipboard.cxx
+++ b/vcl/qt5/QtClipboard.cxx
@@ -81,6 +81,9 @@ void QtClipboard::flushClipboard()
 
 css::uno::Reference<css::datatransfer::XTransferable> QtClipboard::getContents()
 {
+#if defined(EMSCRIPTEN)
+    static QMimeData aMimeData;
+#endif
     osl::MutexGuard aGuard(m_aMutex);
 
     // if we're the owner, we might have the XTransferable from setContents. but
@@ -91,6 +94,10 @@ css::uno::Reference<css::datatransfer::XTransferable> QtClipboard::getContents()
 
     // check if we can still use the shared QtClipboardTransferable
     const QMimeData* pMimeData = QApplication::clipboard()->mimeData(m_aClipboardMode);
+#if defined(EMSCRIPTEN)
+    if (!pMimeData)
+        pMimeData = &aMimeData;
+#endif
     if (m_aContents.is())
     {
         const auto* pTrans = dynamic_cast<QtClipboardTransferable*>(m_aContents.get());
diff --git a/vcl/qt5/QtFrame.cxx b/vcl/qt5/QtFrame.cxx
index 9b645205946e..a70b6616c0a7 100644
--- a/vcl/qt5/QtFrame.cxx
+++ b/vcl/qt5/QtFrame.cxx
@@ -151,7 +151,11 @@ QtFrame::QtFrame(QtFrame* pParent, SalFrameStyleFlags nStyle, bool bUseCairo)
         // a focus-out event, reaching the combo box. This used to map to
         // Qt::ToolTip, which doesn't feel that correct...
         else if (isPopup())
+#ifdef EMSCRIPTEN
+            aWinFlags = Qt::ToolTip | Qt::FramelessWindowHint;
+#else
             aWinFlags = Qt::Window | Qt::FramelessWindowHint | Qt::BypassWindowManagerHint;
+#endif
         else if (nStyle & SalFrameStyleFlags::TOOLWINDOW)
             aWinFlags = Qt::Tool;
         // top level windows can't be transient in Qt, so make them dialogs, if they have a parent. At least
@@ -194,6 +198,8 @@ void QtFrame::FillSystemEnvData(SystemEnvData& rData, sal_IntPtr pWindow, QWidge
         rData.platform = SystemEnvData::Platform::Wayland;
     else if (QGuiApplication::platformName() == "xcb")
         rData.platform = SystemEnvData::Platform::Xcb;
+    else if (QGuiApplication::platformName() == "wasm")
+        rData.platform = SystemEnvData::Platform::WASM;
     else
     {
         // maybe add a SystemEnvData::Platform::Unsupported to avoid special cases and not abort?
@@ -349,7 +355,10 @@ QWindow* QtFrame::windowHandle() const
     // set attribute 'Qt::WA_NativeWindow' first to make sure a window handle actually exists
     QWidget* pChild = asChild();
     assert(pChild->window() == pChild);
+#ifndef EMSCRIPTEN
+    // no idea, why this breaks the menubar for EMSCRIPTEN
     pChild->setAttribute(Qt::WA_NativeWindow);
+#endif
     return pChild->windowHandle();
 }
 
@@ -480,7 +489,7 @@ void QtFrame::Show(bool bVisible, bool bNoActivate)
             modalReparent(true);
         pChild->setVisible(true);
         pChild->raise();
-        if (!bNoActivate && !isPopup())
+        if (!bNoActivate)
         {
             pChild->activateWindow();
             pChild->setFocus();
diff --git a/vcl/qt5/QtWidget.cxx b/vcl/qt5/QtWidget.cxx
index 979d345f679a..d999ebbb7bd8 100644
--- a/vcl/qt5/QtWidget.cxx
+++ b/vcl/qt5/QtWidget.cxx
@@ -631,7 +631,10 @@ QtWidget::QtWidget(QtFrame& rFrame, Qt::WindowFlags f)
 {
     create();
     setMouseTracking(true);
-    setFocusPolicy(Qt::StrongFocus);
+    if (!rFrame.isPopup())
+        setFocusPolicy(Qt::StrongFocus);
+    else
+        setFocusPolicy(Qt::ClickFocus);
 }
 
 static ExtTextInputAttr lcl_MapUndrelineStyle(QTextCharFormat::UnderlineStyle us)