Add Window::screenConfiguration() shim

This shim is for 6.6 to maintain compatibility with previous versions.

CMakeLists.txt

@@ -4,7 +4,7 @@
 cmake_minimum_required(VERSION 3.16)
 
 project(layershellqt)
-set(PROJECT_VERSION "6.5.90")
+set(PROJECT_VERSION "6.6.80")
 set(PROJECT_VERSION_MAJOR 6)
 
 set(CMAKE_C_STANDARD 99)

src/interfaces/window.cpp

@@ -11,6 +11,7 @@
 
 #include <QPlatformSurfaceEvent>
 #include <QPointer>
+#include <mutex>
 #include <optional>
 
 #include <QtWaylandClient/private/qwaylandwindow_p.h>
@@ -34,7 +35,8 @@ public:
     Window::Layer layer = Window::LayerTop;
     QMargins margins;
     QSize desiredSize = QSize(0, 0);
-    Window::ScreenConfiguration screenConfiguration = Window::ScreenFromQWindow;
+    QPointer<QScreen> screen;
+    bool wantsToBeOnActiveScreen = false;
     bool closeOnDismissed = true;
     bool activateOnShow = true;
 };
@@ -152,14 +154,73 @@ Window::Layer Window::layer() const
     return d->layer;
 }
 
+#if LAYERSHELLQTINTERFACE_BUILD_DEPRECATED_SINCE(6, 6)
 Window::ScreenConfiguration Window::screenConfiguration() const
 {
-    return d->screenConfiguration;
+    if (wantsToBeOnActiveScreen()) {
+        return ScreenFromCompositor;
+    } else {
+        // If an explicit screen is set, it's quite inaccurate but it should be fine.
+        return ScreenFromQWindow;
+    }
 }
 
-void Window::setScreenConfiguration(Window::ScreenConfiguration screenConfiguration)
+void Window::setScreenConfiguration(ScreenConfiguration screenConfiguration)
 {
-    d->screenConfiguration = screenConfiguration;
+    static std::once_flag deprecationFlag;
+    std::call_once(deprecationFlag, []() {
+        qWarning() << "LayerShellQt.Window.screenConfiguration is deprecated use screen and wantsToBeOnActiveScreen instead";
+    });
+
+    if (screenConfiguration == ScreenFromCompositor) {
+        setWantsToBeOnActiveScreen(true);
+    } else {
+        setWantsToBeOnActiveScreen(false);
+        setScreen(nullptr);
+    }
+}
+#endif
+
+void Window::setWantsToBeOnActiveScreen(bool set)
+{
+    if (d->wantsToBeOnActiveScreen == set) {
+        return;
+    }
+
+    d->wantsToBeOnActiveScreen = set;
+
+    if (d->wantsToBeOnActiveScreen && d->screen) {
+        d->screen = nullptr;
+        Q_EMIT screenChanged();
+    }
+
+    Q_EMIT wantsToBeOnActiveScreenChanged();
+}
+
+bool Window::wantsToBeOnActiveScreen() const
+{
+    return d->wantsToBeOnActiveScreen;
+}
+
+void Window::setScreen(QScreen *screen)
+{
+    if (d->screen == screen) {
+        return;
+    }
+
+    d->screen = screen;
+
+    if (d->screen && d->wantsToBeOnActiveScreen) {
+        d->wantsToBeOnActiveScreen = false;
+        Q_EMIT wantsToBeOnActiveScreenChanged();
+    }
+
+    Q_EMIT screenChanged();
+}
+
+QScreen *Window::screen() const
+{
+    return d->screen;
 }
 
 bool Window::closeOnDismissed() const

src/interfaces/window.h

@@ -27,8 +27,12 @@ class LAYERSHELLQT_EXPORT Window : public QObject
     Q_PROPERTY(qint32 exclusionZone READ exclusionZone WRITE setExclusiveZone NOTIFY exclusionZoneChanged)
     Q_PROPERTY(Layer layer READ layer WRITE setLayer NOTIFY layerChanged)
     Q_PROPERTY(KeyboardInteractivity keyboardInteractivity READ keyboardInteractivity WRITE setKeyboardInteractivity NOTIFY keyboardInteractivityChanged)
-    Q_PROPERTY(ScreenConfiguration screenConfiguration READ screenConfiguration WRITE setScreenConfiguration)
     Q_PROPERTY(bool activateOnShow READ activateOnShow WRITE setActivateOnShow)
+    Q_PROPERTY(bool wantsToBeOnActiveScreen READ wantsToBeOnActiveScreen WRITE setWantsToBeOnActiveScreen NOTIFY wantsToBeOnActiveScreenChanged)
+    Q_PROPERTY(QScreen *screen READ screen WRITE setScreen NOTIFY screenChanged)
+#if LAYERSHELLQTINTERFACE_ENABLE_DEPRECATED_SINCE(6, 6)
+    Q_PROPERTY(ScreenConfiguration screenConfiguration READ screenConfiguration WRITE setScreenConfiguration)
+#endif
 
 public:
     ~Window() override;
@@ -64,17 +68,6 @@ public:
     };
     Q_ENUM(KeyboardInteractivity)
 
-    /**
-     * This enum type is used to specify which screen to place the surface on.
-     * ScreenFromQWindow (the default) reads QWindow::screen() while ScreenFromCompositor
-     * passes nil and lets the compositor decide.
-     */
-    enum ScreenConfiguration {
-        ScreenFromQWindow = 0,
-        ScreenFromCompositor = 1,
-    };
-    Q_ENUM(ScreenConfiguration)
-
     void setAnchors(Anchors anchor);
     Anchors anchors() const;
 
@@ -96,8 +89,48 @@ public:
     void setLayer(Layer layer);
     Layer layer() const;
 
+#if LAYERSHELLQTINTERFACE_ENABLE_DEPRECATED_SINCE(6, 6)
+    /**
+     * This enum type is used to specify which screen to place the surface on.
+     * ScreenFromQWindow (the default) reads QWindow::screen() while ScreenFromCompositor
+     * passes nil and lets the compositor decide.
+     */
+    LAYERSHELLQTINTERFACE_DEPRECATED_VERSION(6, 6, "Use wantsToBeOnActiveScreen and screen instead")
+    enum ScreenConfiguration {
+        ScreenFromQWindow = 0,
+        ScreenFromCompositor = 1,
+    };
+    Q_ENUM(ScreenConfiguration)
+
+    LAYERSHELLQTINTERFACE_DEPRECATED_VERSION(6, 6, "Use wantsToBeOnActiveScreen and screen instead")
     void setScreenConfiguration(ScreenConfiguration screenConfiguration);
+    LAYERSHELLQTINTERFACE_DEPRECATED_VERSION(6, 6, "Use wantsToBeOnActiveScreen and screen instead")
     ScreenConfiguration screenConfiguration() const;
+#endif
+
+    /**
+     * Indicates whether the layer shell surface should be placed on the active screen based on @a set.
+     *
+     * The active screen depends on the compositor policies.
+     *
+     * If the screen() is @c null and the wantsToBeOnActiveScreen() is @c false, then the
+     * QWindow::screen() will be used to decide what screen the layer shell surface should be placed on.
+     *
+     * The screen() will be reset if @a set is @c true.
+     */
+    void setWantsToBeOnActiveScreen(bool set);
+    bool wantsToBeOnActiveScreen() const;
+
+    /**
+     * Indicates that the layer shell surface should be placed on the specified @a screen.
+     *
+     * If the screen() is @c null and the wantsToBeOnActiveScreen() is @c false, then the
+     * QWindow::screen() will be used to decide what screen the layer shell surface should be placed on.
+     *
+     * The wantsToBeOnActiveScreen() will be reset to @c false after calling this function.
+     */
+    void setScreen(QScreen *screen);
+    QScreen *screen() const;
 
     /**
      * Sets a string based identifier for this window.
@@ -148,6 +181,8 @@ Q_SIGNALS:
     void desiredSizeChanged();
     void keyboardInteractivityChanged();
     void layerChanged();
+    void wantsToBeOnActiveScreenChanged();
+    void screenChanged();
 
 private:
     void initializeShell();

src/qwaylandlayersurface.cpp

@@ -27,8 +27,13 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShellIntegration *shell,
     , m_window(window)
 {
     wl_output *output = nullptr;
-    if (m_interface->screenConfiguration() == Window::ScreenFromQWindow) {
+    if (!m_interface->wantsToBeOnActiveScreen()) {
-        auto waylandScreen = dynamic_cast<QtWaylandClient::QWaylandScreen *>(window->window()->screen()->handle());
+        QScreen *desiredScreen = m_interface->screen();
+        if (!desiredScreen) {
+            desiredScreen = window->window()->screen();
+        }
+
+        auto waylandScreen = dynamic_cast<QtWaylandClient::QWaylandScreen *>(desiredScreen->handle());
         // Qt will always assign a screen to a window, but if the compositor has no screens available a dummy QScreen object is created
         // this will not cast to a QWaylandScreen
         if (!waylandScreen) {