Implement window alert with xdg-activation

This is implemented by not specifying serial, as mentioned in
https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/9#note_854977

Tested on KDE Plasma

Change-Id: I4ef0975040bbce581b615b0318f90601e080235c
Reviewed-by: David Edmundson <davidedmundson@kde.org>

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgactivationv1.cpp

@@ -23,7 +23,8 @@ QWaylandXdgActivationV1::~QWaylandXdgActivationV1()
 
 QWaylandXdgActivationTokenV1 *
 QWaylandXdgActivationV1::requestXdgActivationToken(QWaylandDisplay *display,
-                                                   struct ::wl_surface *surface, uint32_t serial,
+                                                   struct ::wl_surface *surface,
+                                                   std::optional<uint32_t> serial,
                                                    const QString &app_id)
 {
     auto wl = get_activation_token();
@@ -36,8 +37,8 @@ QWaylandXdgActivationV1::requestXdgActivationToken(QWaylandDisplay *display,
     if (!app_id.isEmpty())
         provider->set_app_id(app_id);
 
-    if (display->lastInputDevice())
-        provider->set_serial(serial, display->lastInputDevice()->wl_seat());
+    if (serial && display->lastInputDevice())
+        provider->set_serial(*serial, display->lastInputDevice()->wl_seat());
     provider->commit();
     return provider;
 }

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgactivationv1_p.h

@@ -47,7 +47,8 @@ public:
 
     QWaylandXdgActivationTokenV1 *requestXdgActivationToken(QWaylandDisplay *display,
                                                             struct ::wl_surface *surface,
-                                                            uint32_t serial, const QString &app_id);
+                                                            std::optional<uint32_t> serial,
+                                                            const QString &app_id);
 };
 
 QT_END_NAMESPACE

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgshell.cpp

@@ -541,6 +541,29 @@ void QWaylandXdgSurface::setXdgActivationToken(const QString &token)
     }
 }
 
+void QWaylandXdgSurface::setAlertState(bool enabled)
+{
+    if (m_alertState == enabled)
+        return;
+
+    m_alertState = enabled;
+
+    if (!m_alertState)
+        return;
+
+    auto *activation = m_shell->activation();
+    if (!activation)
+        return;
+
+    const auto tokenProvider = activation->requestXdgActivationToken(
+            m_shell->m_display, m_window->wlSurface(), std::nullopt, m_appId);
+    connect(tokenProvider, &QWaylandXdgActivationTokenV1::done, this,
+            [this, tokenProvider](const QString &token) {
+                m_shell->activation()->activate(token, m_window->wlSurface());
+                tokenProvider->deleteLater();
+            });
+}
+
 QString QWaylandXdgSurface::externWindowHandle()
 {
     if (!m_toplevel || !m_shell->exporter()) {

src/plugins/platforms/wayland/plugins/shellintegration/xdg-shell/qwaylandxdgshell_p.h

@@ -64,6 +64,8 @@ public:
     bool requestActivate() override;
     void setXdgActivationToken(const QString &token) override;
     void requestXdgActivationToken(quint32 serial) override;
+    void setAlertState(bool enabled) override;
+    bool isAlertState() const override { return m_alertState; }
     QString externWindowHandle() override;
 
     void setSizeHints();
@@ -132,6 +134,7 @@ private:
     uint m_appliedConfigureSerial = 0;
     QString m_activationToken;
     QString m_appId;
+    bool m_alertState = false;
 
     friend class QWaylandXdgShell;
 };

src/plugins/platforms/wayland/qwaylandshellsurface_p.h

@@ -71,6 +71,9 @@ public:
     virtual void setXdgActivationToken(const QString &token);
     virtual void requestXdgActivationToken(quint32 serial);
 
+    virtual void setAlertState(bool enabled) { Q_UNUSED(enabled); }
+    virtual bool isAlertState() const { return false; }
+
     virtual QString externWindowHandle() { return QString(); }
 
     inline QWaylandWindow *window() { return m_window; }

src/plugins/platforms/wayland/qwaylandwindow.cpp

@@ -502,6 +502,20 @@ void QWaylandWindow::setMask(const QRegion &mask)
     mSurface->commit();
 }
 
+void QWaylandWindow::setAlertState(bool enabled)
+{
+    if (mShellSurface)
+        mShellSurface->setAlertState(enabled);
+}
+
+bool QWaylandWindow::isAlertState() const
+{
+    if (mShellSurface)
+        return mShellSurface->isAlertState();
+
+    return false;
+}
+
 void QWaylandWindow::applyConfigureWhenPossible()
 {
     QMutexLocker resizeLocker(&mResizeLock);

src/plugins/platforms/wayland/qwaylandwindow_p.h

@@ -143,6 +143,9 @@ public:
 
     void setMask(const QRegion &region) override;
 
+    void setAlertState(bool enabled) override;
+    bool isAlertState() const override;
+
     qreal scale() const;
     qreal devicePixelRatio() const override;