QtCompositor: Provide a way to update the clipboard on a client

Clipboard synchronization happens when a client is keyboard-focused, but
some clients may require clipboard access even when not in focus. Add
an updateSelection() slot to QWaylandSurface so that the compositor
implementor can synchronize the clipboard manually or through a
signal-slot connection.

Change-Id: I31475e120ae6efd7bdec4dda453c9ebf20099442
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>

2 files changed, 25 insertions, 0 deletions

diff --git a/src/compositor/compositor_api/qwaylandsurface.cpp b/src/compositor/compositor_api/qwaylandsurface.cpp
index 8ed8bcbd..c5ae0854 100644
--- a/src/compositor/compositor_api/qwaylandsurface.cpp
+++ b/src/compositor/compositor_api/qwaylandsurface.cpp
@@ -47,6 +47,9 @@
 #include "wayland_wrapper/qwlsubsurface_p.h"
 #include "wayland_wrapper/qwlcompositor_p.h"
 #include "wayland_wrapper/qwlshellsurface_p.h"
+#include "wayland_wrapper/qwlinputdevice_p.h"
+#include "wayland_wrapper/qwldatadevice_p.h"
+#include "wayland_wrapper/qwldatadevicemanager_p.h"
 
 #include "qwaylandcompositor.h"
 #include "waylandwindowmanagerintegration.h"
@@ -373,4 +376,22 @@ void QWaylandSurface::ping()
         d->surface->shellSurface()->ping();
 }
 
+/*!
+    Updates the surface with the compositor's retained clipboard selection. While this
+    is done automatically when the surface receives keyboard focus, this function is
+    useful for updating clients which do not have keyboard focus.
+*/
+void QWaylandSurface::updateSelection()
+{
+    Q_D(QWaylandSurface);
+    const QtWayland::InputDevice *inputDevice = d->surface->compositor()->defaultInputDevice();
+    if (inputDevice) {
+        const QtWayland::DataDevice *dataDevice = inputDevice->dataDevice();
+        if (dataDevice) {
+            d->surface->compositor()->dataDeviceManager()->offerRetainedSelection(
+                        dataDevice->resourceMap().value(d->surface->resource()->client())->handle);
+        }
+    }
+}
+
 QT_END_NAMESPACE
diff --git a/src/compositor/compositor_api/qwaylandsurface.h b/src/compositor/compositor_api/qwaylandsurface.h
index 333144a6..c260416a 100644
--- a/src/compositor/compositor_api/qwaylandsurface.h
+++ b/src/compositor/compositor_api/qwaylandsurface.h
@@ -175,6 +175,10 @@ public:
     Q_INVOKABLE void destroySurface();
     Q_INVOKABLE void destroySurfaceByForce();
     Q_INVOKABLE void ping();
+
+public slots:
+    void updateSelection();
+
 signals:
     void mapped();
     void unmapped();