Client: Expose a way to set window margins via native interface

The lack of such API is a big hassle to me since a long time.
All that time I was forced to have my own fork of the
xdg-shell plugin in the application code in order to have
shadows on Wayland with custom client-side decorations.
I hope I won't have to maintain the fork anymore.

Pick-to: 6.4
Change-Id: Iaf498469843b5cac5c458049164065c4ef15877d
Reviewed-by: David Edmundson <davidedmundson@kde.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/client/qwaylandnativeinterface.cpp b/src/client/qwaylandnativeinterface.cpp
index 6d858348..f2620fc4 100644
--- a/src/client/qwaylandnativeinterface.cpp
+++ b/src/client/qwaylandnativeinterface.cpp
@@ -129,6 +129,17 @@ void *QWaylandNativeInterface::nativeResourceForContext(const QByteArray &resour
 }
 #endif  // opengl
 
+QPlatformNativeInterface::NativeResourceForWindowFunction QWaylandNativeInterface::nativeResourceFunctionForWindow(const QByteArray &resource)
+{
+    QByteArray lowerCaseResource = resource.toLower();
+
+    if (lowerCaseResource == "setmargins") {
+        return NativeResourceForWindowFunction(reinterpret_cast<void *>(setWindowMargins));
+    }
+
+    return nullptr;
+}
+
 QVariantMap QWaylandNativeInterface::windowProperties(QPlatformWindow *window) const
 {
     QWaylandWindow *waylandWindow = static_cast<QWaylandWindow *>(window);
@@ -158,6 +169,12 @@ void QWaylandNativeInterface::emitWindowPropertyChanged(QPlatformWindow *window,
     emit windowPropertyChanged(window,name);
 }
 
+void QWaylandNativeInterface::setWindowMargins(QWindow *window, const QMargins &margins)
+{
+    QWaylandWindow *wlWindow = static_cast<QWaylandWindow*>(window->handle());
+    wlWindow->setCustomMargins(margins);
+}
+
 }
 
 QT_END_NAMESPACE