Client: Implement QPlatformWindow::startSystemMove()

Hooks into what we already use for the window decorations.

Task-number: QTBUG-58044
Change-Id: Idcd971f69d52a5bb760bb6bffb26e9f5bdd429df
Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@liri.io>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

src/plugins/platforms/wayland/qwaylandshellsurface_p.h

@@ -78,7 +78,7 @@ public:
     virtual void resize(QWaylandInputDevice * /*inputDevice*/, enum wl_shell_surface_resize /*edges*/)
     {}
 
-    virtual void move(QWaylandInputDevice * /*inputDevice*/) {}
+    virtual bool move(QWaylandInputDevice *) { return false; }
     virtual void setTitle(const QString & /*title*/) {}
     virtual void setAppId(const QString & /*appId*/) {}
 

src/plugins/platforms/wayland/qwaylandwindow.cpp

@@ -1045,6 +1045,14 @@ void QWaylandWindow::addAttachOffset(const QPoint point)
     mOffset += point;
 }
 
+bool QtWaylandClient::QWaylandWindow::startSystemMove(const QPoint &pos)
+{
+    Q_UNUSED(pos);
+    if (auto seat = display()->lastInputDevice())
+        return mShellSurface && mShellSurface->move(seat);
+    return false;
+}
+
 }
 
 QT_END_NAMESPACE

src/plugins/platforms/wayland/qwaylandwindow_p.h

@@ -201,6 +201,8 @@ public:
     void propagateSizeHints() override { }
     void addAttachOffset(const QPoint point);
 
+    bool startSystemMove(const QPoint &pos) override;
+
     void requestUpdate() override;
 
 public slots:

src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp

@@ -74,10 +74,11 @@ void QWaylandWlShellSurface::resize(QWaylandInputDevice *inputDevice, enum wl_sh
            edges);
 }
 
-void QWaylandWlShellSurface::move(QWaylandInputDevice *inputDevice)
+bool QWaylandWlShellSurface::move(QWaylandInputDevice *inputDevice)
 {
     move(inputDevice->wl_seat(),
          inputDevice->serial());
+    return true;
 }
 
 void QWaylandWlShellSurface::setTitle(const QString & title)

src/plugins/platforms/wayland/qwaylandwlshellsurface_p.h

@@ -81,7 +81,7 @@ public:
     void resize(QWaylandInputDevice *inputDevice, enum wl_shell_surface_resize edges) override;
 
     using QtWayland::wl_shell_surface::move;
-    void move(QWaylandInputDevice *inputDevice) override;
+    bool move(QWaylandInputDevice *inputDevice) override;
 
     void setTitle(const QString & title) override;
     void setAppId(const QString &appId) override;

src/plugins/platforms/wayland/qwaylandxdgshellv6.cpp

@@ -142,10 +142,13 @@ void QWaylandXdgSurfaceV6::resize(QWaylandInputDevice *inputDevice, enum wl_shel
 }
 
 
-void QWaylandXdgSurfaceV6::move(QWaylandInputDevice *inputDevice)
+bool QWaylandXdgSurfaceV6::move(QWaylandInputDevice *inputDevice)
 {
-    Q_ASSERT(m_toplevel && m_toplevel->isInitialized());
+    if (m_toplevel && m_toplevel->isInitialized()) {
-    m_toplevel->move(inputDevice->wl_seat(), inputDevice->serial());
+        m_toplevel->move(inputDevice->wl_seat(), inputDevice->serial());
+        return true;
+    }
+    return false;
 }
 
 void QWaylandXdgSurfaceV6::setTitle(const QString &title)

src/plugins/platforms/wayland/qwaylandxdgshellv6_p.h

@@ -79,7 +79,7 @@ public:
 
     void resize(QWaylandInputDevice *inputDevice, enum zxdg_toplevel_v6_resize_edge edges);
     void resize(QWaylandInputDevice *inputDevice, enum wl_shell_surface_resize edges) override;
-    void move(QWaylandInputDevice *inputDevice) override;
+    bool move(QWaylandInputDevice *inputDevice) override;
     void setTitle(const QString &title) override;
     void setAppId(const QString &appId) override;
 

src/plugins/platforms/wayland/qwaylandxdgsurface.cpp

@@ -85,10 +85,11 @@ void QWaylandXdgSurface::resize(QWaylandInputDevice *inputDevice, enum resize_ed
            edges);
 }
 
-void QWaylandXdgSurface::move(QWaylandInputDevice *inputDevice)
+bool QWaylandXdgSurface::move(QWaylandInputDevice *inputDevice)
 {
     move(inputDevice->wl_seat(),
          inputDevice->serial());
+    return true;
 }
 
 void QWaylandXdgSurface::setMaximized()

src/plugins/platforms/wayland/qwaylandxdgsurface_p.h

@@ -85,7 +85,7 @@ public:
     void resize(QWaylandInputDevice *inputDevice, enum wl_shell_surface_resize edges) override;
 
     using QtWayland::xdg_surface::move;
-    void move(QWaylandInputDevice *inputDevice) override;
+    bool move(QWaylandInputDevice *inputDevice) override;
 
     void setTitle(const QString &title) override;
     void setAppId(const QString &appId) override;