Set surface class name.

The class name identifies the general class of applications to
which the surface belongs. The class is the name of the desktop
file and is derived from the process name.

We might want to add a new method to QWindow in order to set
a custom class name.

It's quiet similar to WM_CLASS on X11, for more information
see https://live.gnome.org/GnomeShell/ApplicationBased

Change-Id: I5be90fb45e82e79710dda376f42c18c126d2a80f
Reviewed-by: Andy Nichols <andy.nichols@digia.com>

3 files changed, 14 insertions, 2 deletions

diff --git a/src/compositor/wayland_wrapper/wlshellsurface.cpp b/src/compositor/wayland_wrapper/wlshellsurface.cpp
index 8f837fc7a..aed1ee64f 100644
--- a/src/compositor/wayland_wrapper/wlshellsurface.cpp
+++ b/src/compositor/wayland_wrapper/wlshellsurface.cpp
@@ -284,8 +284,8 @@ void ShellSurface::set_class(struct wl_client *client,
                              const char *class_)
 {
     Q_UNUSED(client);
-    Q_UNUSED(resource);
-    Q_UNUSED(class_);
+    ShellSurface *self = static_cast<ShellSurface *>(resource->data);
+    self->surface()->setClassName(QString::fromUtf8(class_));
 }
 
 const struct wl_shell_surface_interface ShellSurface::shell_surface_interface = {
diff --git a/src/compositor/wayland_wrapper/wlsurface.cpp b/src/compositor/wayland_wrapper/wlsurface.cpp
index d05f36b52..d0586a90b 100644
--- a/src/compositor/wayland_wrapper/wlsurface.cpp
+++ b/src/compositor/wayland_wrapper/wlsurface.cpp
@@ -501,6 +501,14 @@ void Surface::surface_commit(wl_client *client, wl_resource *resource)
     resolve<Surface>(resource)->commit();
 }
 
+void Surface::setClassName(const QString &className)
+{
+    if (m_className != className) {
+        m_className = className;
+        emit waylandSurface()->classNameChanged();
+    }
+}
+
 void Surface::setTitle(const QString &title)
 {
     if (m_title != title) {
diff --git a/src/compositor/wayland_wrapper/wlsurface.h b/src/compositor/wayland_wrapper/wlsurface.h
index 642e8f790..8ec87fa36 100644
--- a/src/compositor/wayland_wrapper/wlsurface.h
+++ b/src/compositor/wayland_wrapper/wlsurface.h
@@ -123,6 +123,9 @@ public:
 
     static const struct wl_surface_interface surface_interface;
 
+    QString className() const { return m_className; }
+    void setClassName(const QString &className);
+
     QString title() const { return m_title; }
     void setTitle(const QString &title);
 
@@ -157,6 +160,7 @@ private:
 
     QPointF m_position;
     QSize m_size;
+    QString m_className;
     QString m_title;
     bool m_transientInactive;