Add a way to have out of source shell integrations

Some platforms (especially non-desktop ones) may use a custom
Wayland shell extension, more tailored to the form factor than
the generic and desktoppy wl_shell or xdg_shell. Instead of stuffing
N protocol implementations in the QPA plugin use a plugin architecture
to allow them to live out of tree.
When creating a shell surface the QT_WAYLAND_SHELL_INTEGRATION env
variable will be checked, and if it points to a valid plugin that
will be used to create the shell surface, falling back to wl_shell
or xdg_shell if no plugin is specified.

Change-Id: I05019174bb915199dd726f5fdcc0385ef846e8de
Reviewed-by: Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
Reviewed-by: Philippe Coval <rzr@gna.org>
Reviewed-by: Jan Arne Petersen <jan.petersen@kdab.com>
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/src/client/qwaylandintegration_p.h b/src/client/qwaylandintegration_p.h
index 7c062c0ee..025e0b4df 100644
--- a/src/client/qwaylandintegration_p.h
+++ b/src/client/qwaylandintegration_p.h
@@ -51,6 +51,7 @@ class QWaylandBuffer;
 class QWaylandDisplay;
 class QWaylandClientBufferIntegration;
 class QWaylandServerBufferIntegration;
+class QWaylandShellIntegration;
 
 class Q_WAYLAND_CLIENT_EXPORT QWaylandIntegration : public QPlatformIntegration
 {
@@ -90,12 +91,15 @@ public:
 
     virtual QWaylandClientBufferIntegration *clientBufferIntegration() const;
     virtual QWaylandServerBufferIntegration *serverBufferIntegration() const;
+    virtual QWaylandShellIntegration *shellIntegration() const;
 protected:
     QWaylandClientBufferIntegration *mClientBufferIntegration;
     QWaylandServerBufferIntegration *mServerBufferIntegration;
+    QWaylandShellIntegration *mShellIntegration;
 private:
     void initializeClientBufferIntegration();
     void initializeServerBufferIntegration();
+    void initializeShellIntegration();
     QPlatformFontDatabase *mFontDb;
     QPlatformClipboard *mClipboard;
     QPlatformDrag *mDrag;
@@ -105,6 +109,7 @@ private:
     QPlatformAccessibility *mAccessibility;
     bool mClientBufferIntegrationInitialized;
     bool mServerBufferIntegrationInitialized;
+    bool mShellIntegrationInitialized;
 };
 
 QT_END_NAMESPACE