Expose the Window interface to QML

If we are designing our UI's windows from QML, it makes sense that we
might want to configure how they're placed from the same place.

Everything was already in place but for a few technical bits which this
change adds.

Signed-off-by: Victoria Fischer <victoria.fischer@mbition.io>

.gitlab-ci.yml

@@ -2,5 +2,8 @@
 # SPDX-License-Identifier: CC0-1.0
 
 include:
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/reuse-lint.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux.yml
   - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/freebsd.yml
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux-qt6.yml
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/freebsd-qt6.yml

CMakeLists.txt

@@ -4,20 +4,18 @@
 cmake_minimum_required(VERSION 3.16)
 
 project(layershellqt)
-set(PROJECT_VERSION "5.24.7")
+set(PROJECT_VERSION "5.27.6")
 set(PROJECT_VERSION_MAJOR 5)
 
 set(CMAKE_C_STANDARD 99)
 
-set(QT_MIN_VERSION "5.15.0")
+set(QT_MIN_VERSION "5.15.2")
-set(KF5_MIN_VERSION "5.86")
+set(KF5_MIN_VERSION "5.102.0")
 set(KDE_COMPILERSETTINGS_LEVEL "5.82")
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
-find_package(Qt5 ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS WaylandClient Qml)
-find_package(Qt5XkbCommonSupport REQUIRED PRIVATE)
 find_package(ECM ${KF5_MIN_VERSION} REQUIRED NO_MODULE)
 set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${ECM_MODULE_PATH})
 
@@ -25,15 +23,22 @@ include(KDEInstallDirs)
 include(KDECMakeSettings)
 include(KDECompilerSettings NO_POLICY_SCOPE)
 include(ECMSetupVersion)
+include(ECMDeprecationSettings)
 include(ECMGenerateHeaders)
 include(CMakePackageConfigHelpers)
 include(FeatureSummary)
 include(GenerateExportHeader)
 include(KDEClangFormat)
+include(ECMQmlModule)
 include(ECMQtDeclareLoggingCategory)
 
+
+find_package(Qt${QT_MAJOR_VERSION} ${QT_MIN_VERSION} CONFIG REQUIRED COMPONENTS WaylandClient Qml)
+if (QT_MAJOR_VERSION EQUAL "5")
+    find_package(Qt5XkbCommonSupport REQUIRED PRIVATE)
+    find_package(QtWaylandScanner REQUIRED)
+endif()
 find_package(WaylandScanner REQUIRED)
-find_package(QtWaylandScanner REQUIRED)
 find_package(Wayland 1.3 COMPONENTS Client Server)
 find_package(WaylandProtocols REQUIRED)
 find_package(PkgConfig REQUIRED)
@@ -51,10 +56,15 @@ ecm_setup_version(${PROJECT_VERSION} VARIABLE_PREFIX LAYERSHELLQT
 
 file(GLOB_RECURSE ALL_CLANG_FORMAT_SOURCE_FILES *.cpp *.h)
 kde_clang_format(${ALL_CLANG_FORMAT_SOURCE_FILES})
+
+ecm_set_disabled_deprecation_versions(QT 5.15.2
+    KF 5.101
+)
+
 add_subdirectory(src)
 add_subdirectory(tests)
 
-set(CMAKECONFIG_INSTALL_DIR ${KDE_INSTALL_LIBDIR}/cmake/LayerShellQt)
+set(CMAKECONFIG_INSTALL_DIR ${KDE_INSTALL_CMAKEPACKAGEDIR}/LayerShellQt)
 install(EXPORT LayerShellQtTargets
         NAMESPACE LayerShellQt::
         DESTINATION ${CMAKECONFIG_INSTALL_DIR}

LayerShellQtConfig.cmake.in

@@ -4,6 +4,6 @@
 @PACKAGE_INIT@
 
 include(CMakeFindDependencyMacro)
-find_dependency(Qt5Gui "@QT_MIN_VERSION@")
+find_dependency(Qt@QT_MAJOR_VERSION@Gui "@QT_MIN_VERSION@")
 
 include("${CMAKE_CURRENT_LIST_DIR}/LayerShellQtTargets.cmake")

metainfo.yaml

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: None
+# SPDX-License-Identifier: CC0-1.0
+
+maintainer:
+- vladz
+description: Layer Shell Qt
+platforms:
+    - name: Linux
+    - name: FreeBSD
+portingAid: false
+deprecated: false
+release: true
+
+group: Plasma
+public_lib: true
+public_source_dirs:
+    - src/interfaces

src/CMakeLists.txt

@@ -3,8 +3,16 @@
 
 remove_definitions(-DQT_NO_SIGNALS_SLOTS_KEYWORDS)
 
-ecm_add_qtwayland_client_protocol(LAYER_SHELL_SOURCES PROTOCOL ${WaylandProtocols_DATADIR}/stable/xdg-shell/xdg-shell.xml BASENAME xdg-shell)
+add_library(LayerShellQtInterface)
-ecm_add_qtwayland_client_protocol(LAYER_SHELL_SOURCES PROTOCOL wlr-layer-shell-unstable-v1.xml BASENAME wlr-layer-shell-unstable-v1)
+if (QT_MAJOR_VERSION EQUAL "5")
+    ecm_add_qtwayland_client_protocol(LAYER_SHELL_SOURCES PROTOCOL ${WaylandProtocols_DATADIR}/stable/xdg-shell/xdg-shell.xml BASENAME xdg-shell)
+    ecm_add_qtwayland_client_protocol(LAYER_SHELL_SOURCES PROTOCOL wlr-layer-shell-unstable-v1.xml BASENAME wlr-layer-shell-unstable-v1)
+else()
+    qt6_generate_wayland_protocol_client_sources(LayerShellQtInterface FILES
+        ${WaylandProtocols_DATADIR}/stable/xdg-shell/xdg-shell.xml
+        ${CMAKE_CURRENT_SOURCE_DIR}/wlr-layer-shell-unstable-v1.xml
+    )
+endif()
 
 ecm_qt_declare_logging_category(LAYER_SHELL_SOURCES
     HEADER
@@ -15,8 +23,12 @@ ecm_qt_declare_logging_category(LAYER_SHELL_SOURCES
         layershellqt
 )
 
-add_library(LayerShellQtInterface SHARED qwaylandlayersurface.cpp interfaces/window.cpp interfaces/shell.cpp qwaylandlayershellintegration.cpp qwaylandlayershell.cpp ${LAYER_SHELL_SOURCES})
+target_sources(LayerShellQtInterface PRIVATE qwaylandlayersurface.cpp interfaces/window.cpp interfaces/shell.cpp qwaylandlayershellintegration.cpp qwaylandlayershell.cpp ${LAYER_SHELL_SOURCES})
-target_link_libraries(LayerShellQtInterface PRIVATE Qt::Gui Qt::WaylandClientPrivate Qt::XkbCommonSupportPrivate Wayland::Client PkgConfig::XKBCOMMON)
+target_link_libraries(LayerShellQtInterface PUBLIC Qt::Gui)
+target_link_libraries(LayerShellQtInterface PRIVATE Qt::WaylandClientPrivate Wayland::Client PkgConfig::XKBCOMMON)
+if (TARGET Qt::XkbCommonSupportPrivate)
+    target_link_libraries(LayerShellQtInterface PRIVATE Qt::XkbCommonSupportPrivate)
+endif()
 target_include_directories(LayerShellQtInterface PUBLIC "$<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/LayerShellQt>"
                                               INTERFACE "$<INSTALL_INTERFACE:${KDE_INSTALL_INCLUDEDIR}/>"
 )
@@ -27,7 +39,10 @@ set_target_properties(LayerShellQtInterface PROPERTIES VERSION   ${LAYERSHELLQT_
 )
 
 add_library(layer-shell SHARED qwaylandlayershellintegrationplugin.cpp)
-target_link_libraries(layer-shell LayerShellQtInterface Qt::WaylandClient Qt::WaylandClientPrivate Qt::XkbCommonSupportPrivate Wayland::Client PkgConfig::XKBCOMMON)
+target_link_libraries(layer-shell LayerShellQtInterface Qt::WaylandClient Qt::WaylandClientPrivate Wayland::Client PkgConfig::XKBCOMMON)
+if (TARGET Qt::XkbCommonSupportPrivate)
+    target_link_libraries(layer-shell Qt::XkbCommonSupportPrivate)
+endif()
 
 ecm_generate_headers(LayerShellQt_HEADERS
     HEADER_NAMES
@@ -45,7 +60,7 @@ generate_export_header(LayerShellQtInterface
 )
 
 install(TARGETS layer-shell
-        LIBRARY DESTINATION ${QT_PLUGIN_INSTALL_DIR}/wayland-shell-integration)
+        LIBRARY DESTINATION ${KDE_INSTALL_QTPLUGINDIR}/wayland-shell-integration)
 
 install(TARGETS LayerShellQtInterface EXPORT LayerShellQtTargets ${KDE_INSTALL_TARGETS_DEFAULT_ARGS})
 
@@ -54,3 +69,5 @@ install(FILES
     ${CMAKE_CURRENT_BINARY_DIR}/LayerShellQt/layershellqt_export.h
     DESTINATION ${KDE_INSTALL_INCLUDEDIR}/LayerShellQt COMPONENT Devel
 )
+
+add_subdirectory(declarative)

src/declarative/CMakeLists.txt

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: 2021 Aleix Pol Gonzalez <aleix.pol_gonzalez@mercedes-benz.com>
+# SPDX-License-Identifier: BSD-3-Clause
+
+ecm_add_qml_module(LayerShellQtQml URI "org.kde.layershell")
+target_sources(LayerShellQtQml PRIVATE layershellqtplugin.cpp)
+target_link_libraries(LayerShellQtQml PRIVATE Qt::Qml LayerShellQtInterface)
+
+ecm_finalize_qml_module(LayerShellQtQml DESTINATION ${KDE_INSTALL_QMLDIR})

src/declarative/layershellqtplugin.cpp

@@ -0,0 +1,24 @@
+/*
+ *   SPDX-FileCopyrightText: 2023 Aleix Pol Gonzalez <aleix.pol_gonzalez@mercedes-benz.com>
+ *
+ *   SPDX-License-Identifier: LGPL-3.0-or-later
+ */
+
+#include <QQmlExtensionPlugin>
+#include "../interfaces/window.h"
+#include <qqml.h>
+
+QML_DECLARE_TYPEINFO(LayerShellQt::Window, QML_HAS_ATTACHED_PROPERTIES)
+
+class Plugin : public QQmlExtensionPlugin
+{
+    Q_PLUGIN_METADATA(IID "org.kde.layershellqt")
+    Q_OBJECT
+public:
+    void registerTypes(const char *uri) override {
+        Q_ASSERT(QLatin1String(uri) == QLatin1String("org.kde.layershell"));
+        qmlRegisterType<LayerShellQt::Window>(uri, 1, 0, "Window");
+    }
+};
+
+#include "layershellqtplugin.moc"

src/interfaces/window.cpp

@@ -5,10 +5,10 @@
  */
 
 #include "window.h"
-#include "../qwaylandlayersurface_p.h"
 #include <layershellqt_logging.h>
-#include <private/qwaylandshellsurface_p.h>
+
-#include <private/qwaylandwindow_p.h>
+#include <QPointer>
+#include <optional>
 
 using namespace LayerShellQt;
 
@@ -27,7 +27,7 @@ public:
     Window::KeyboardInteractivity keyboardInteractivity = Window::KeyboardInteractivityExclusive;
     Window::Layer layer = Window::LayerTop;
     QMargins margins;
-    QWaylandLayerSurface *getSurface() const;
+    std::optional<QPointer<QScreen>> desiredOutput;
 };
 
 static QMap<QWindow *, Window *> s_map;
@@ -40,9 +40,7 @@ Window::~Window()
 void Window::setAnchors(Anchors anchors)
 {
     d->anchors = anchors;
-    if (auto surface = d->getSurface()) {
+    Q_EMIT anchorsChanged();
-        surface->setAnchor(anchors);
-    }
 }
 
 Window::Anchors Window::anchors() const
@@ -53,9 +51,7 @@ Window::Anchors Window::anchors() const
 void Window::setExclusiveZone(int32_t zone)
 {
     d->exclusionZone = zone;
-    if (auto surface = d->getSurface()) {
+    Q_EMIT exclusionZoneChanged();
-        surface->setExclusiveZone(zone);
-    }
 }
 
 int32_t Window::exclusionZone() const
@@ -66,9 +62,7 @@ int32_t Window::exclusionZone() const
 void Window::setMargins(const QMargins &margins)
 {
     d->margins = margins;
-    if (auto surface = d->getSurface()) {
+    Q_EMIT marginsChanged();
-        surface->setMargins(margins);
-    }
 }
 
 QMargins Window::margins() const
@@ -79,9 +73,7 @@ QMargins Window::margins() const
 void Window::setKeyboardInteractivity(KeyboardInteractivity interactivity)
 {
     d->keyboardInteractivity = interactivity;
-    if (auto surface = d->getSurface()) {
+    Q_EMIT keyboardInteractivityChanged();
-        surface->setKeyboardInteractivity(interactivity);
-    }
 }
 
 Window::KeyboardInteractivity Window::keyboardInteractivity() const
@@ -92,9 +84,6 @@ Window::KeyboardInteractivity Window::keyboardInteractivity() const
 void Window::setLayer(Layer layer)
 {
     d->layer = layer;
-    if (auto surface = d->getSurface()) {
-        surface->setLayer(layer);
-    }
 }
 
 void Window::setScope(const QString &scope)
@@ -113,6 +102,21 @@ Window::Layer Window::layer() const
     return d->layer;
 }
 
+QScreen *Window::desiredOutput() const
+{
+    // Don't use .value_or here to avoid a temporary QPointer
+    if (d->desiredOutput.has_value()) {
+        return d->desiredOutput.value();
+    }
+
+    return d->parentWindow->screen();
+}
+
+void Window::setDesiredOutput(QScreen *output)
+{
+    d->desiredOutput = output;
+}
+
 Window::Window(QWindow *window)
     : QObject(window)
     , d(new WindowPrivate(window))
@@ -122,6 +126,10 @@ Window::Window(QWindow *window)
 
 Window *Window::get(QWindow *window)
 {
+    if (!window) {
+        return nullptr;
+    }
+
     auto layerShellWindow = s_map.value(window);
     if (layerShellWindow) {
         return layerShellWindow;
@@ -129,20 +137,7 @@ Window *Window::get(QWindow *window)
     return new Window(window);
 }
 
-QWaylandLayerSurface *WindowPrivate::getSurface() const
+Window *Window::qmlAttachedProperties(QObject *object)
 {
-    if (!parentWindow) {
+    return get(qobject_cast<QWindow *>(object));
-        return nullptr;
-    }
-    auto ww = dynamic_cast<QtWaylandClient::QWaylandWindow *>(parentWindow->handle());
-    if (!ww) {
-        qCDebug(LAYERSHELLQT) << "window not a wayland window" << parentWindow;
-        return nullptr;
-    }
-    QWaylandLayerSurface *s = qobject_cast<QWaylandLayerSurface *>(ww->shellSurface());
-    if (!s) {
-        qCDebug(LAYERSHELLQT) << "window not using wlr-layer-shell" << parentWindow << ww->shellSurface();
-        return nullptr;
-    }
-    return s;
 }

src/interfaces/window.h

@@ -9,6 +9,7 @@
 #define LAYERSHELLQTWINDOW_H
 
 #include <QObject>
+#include <QScreen>
 #include <QWindow>
 
 #include "layershellqt_export.h"
@@ -20,14 +21,22 @@ class WindowPrivate;
 class LAYERSHELLQT_EXPORT Window : public QObject
 {
     Q_OBJECT
+    Q_PROPERTY(int anchors READ anchors WRITE setAnchorsInt NOTIFY anchorsChanged)
+    Q_PROPERTY(QString scope READ scope WRITE setScope)
+    Q_PROPERTY(QMargins margins READ margins WRITE setMargins NOTIFY marginsChanged)
+    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)
+
 public:
+    Window(QWindow *window = nullptr);
     ~Window() override;
 
     enum Anchor {
-        AnchorTop = 1, // the top edge of the anchor rectangle
+        AnchorTop = 1, ///< The top edge of the anchor rectangle
-        AnchorBottom = 2, // the bottom edge of the anchor rectangle
+        AnchorBottom = 2, ///< The bottom edge of the anchor rectangle
-        AnchorLeft = 4, // the left edge of the anchor rectangle
+        AnchorLeft = 4, ///< The left edge of the anchor rectangle
-        AnchorRight = 8, // the right edge of the anchor rectangle
+        AnchorRight = 8, ///< The right edge of the anchor rectangle
     };
     Q_ENUM(Anchor);
     Q_DECLARE_FLAGS(Anchors, Anchor)
@@ -68,6 +77,14 @@ public:
     void setLayer(Layer layer);
     Layer layer() const;
 
+    /**
+     * If set, the compositor will try to put the window on the given screen.
+     * If its not set, then the compositor will decide where to put the window.
+     * Under normal circumstances, this should be the active output.
+     */
+    void setDesiredOutput(QScreen *output);
+    QScreen *desiredOutput() const;
+
     /**
      * Sets a string based identifier for this window.
      * This may be used by a compositor to determine stacking
@@ -78,14 +95,25 @@ public:
     void setScope(const QString &scope);
     QString scope() const;
 
+    /// Workaround needed for Qt 5 not to get confused with types, not necessary on Qt 6
+    void setAnchorsInt(int x) { setAnchors(Anchors(x)); }
+
     /**
      * Gets the LayerShell Window for a given Qt Window
      * Ownership is not transferred
      */
     static Window *get(QWindow *window);
 
+    static Window *qmlAttachedProperties(QObject *object);
+
+Q_SIGNALS:
+    void anchorsChanged();
+    void exclusionZoneChanged();
+    void marginsChanged();
+    void keyboardInteractivityChanged();
+    void layerChanged();
+
 private:
-    Window(QWindow *window);
     QScopedPointer<WindowPrivate> d;
 };
 

src/qwaylandlayershellintegration.cpp

@@ -24,7 +24,9 @@ QWaylandLayerShellIntegration::~QWaylandLayerShellIntegration()
 
 bool QWaylandLayerShellIntegration::initialize(QtWaylandClient::QWaylandDisplay *display)
 {
+#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
     QWaylandShellIntegration::initialize(display);
+#endif
     display->addRegistryListener(registryLayer, this);
     return m_layerShell != nullptr;
 }

src/qwaylandlayersurface.cpp

@@ -6,9 +6,9 @@
  */
 
 #include "interfaces/shell.h"
+#include "layershellqt_logging.h"
 #include "qwaylandlayershell_p.h"
 #include "qwaylandlayersurface_p.h"
-#include "layershellqt_logging.h"
 
 #include <QtWaylandClient/private/qwaylandscreen_p.h>
 #include <QtWaylandClient/private/qwaylandsurface_p.h>
@@ -23,23 +23,44 @@ QWaylandLayerSurface::QWaylandLayerSurface(QWaylandLayerShell *shell, QtWaylandC
     LayerShellQt::Window *interface = Window::get(window->window());
     Q_ASSERT(interface);
 
+    wl_output *output = nullptr;
+    QScreen *screen = interface->desiredOutput();
+    if (screen) {
+        auto waylandScreen = dynamic_cast<QtWaylandClient::QWaylandScreen *>(screen->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
-    QtWaylandClient::QWaylandScreen *screen = window->waylandScreen();
+        if (!waylandScreen) {
-    if (screen->isPlaceholder()) {
             qCWarning(LAYERSHELLQT) << "Creating a layer shell for placeholder screen. This will be positioned incorrectly";
+        } else {
+            output = waylandScreen->output();
         }
-
+    }
-    init(shell->get_layer_surface(window->waylandSurface()->object(), screen->isPlaceholder() ? nullptr : screen->output(), interface->layer(), interface->scope()));
+    init(shell->get_layer_surface(window->waylandSurface()->object(), output, interface->layer(), interface->scope()));
-
+    connect(interface, &Window::layerChanged, this, [this, interface]() {
-    Window::Anchors anchors = interface->anchors();
+        setLayer(interface->layer());
+    });
 
     set_anchor(interface->anchors());
-    setMargins(interface->margins());
+    connect(interface, &Window::anchorsChanged, this, [this, interface]() {
-    setKeyboardInteractivity(interface->keyboardInteractivity());
+        set_anchor(interface->anchors());
+    });
     setExclusiveZone(interface->exclusionZone());
+    connect(interface, &Window::exclusionZoneChanged, this, [this, interface]() {
+        setExclusiveZone(interface->exclusionZone());
+    });
+
+    setMargins(interface->margins());
+    connect(interface, &Window::marginsChanged, this, [this, interface]() {
+        setMargins(interface->margins());
+    });
+
+    setKeyboardInteractivity(interface->keyboardInteractivity());
+    connect(interface, &Window::keyboardInteractivityChanged, this, [this, interface]() {
+        setKeyboardInteractivity(interface->keyboardInteractivity());
+    });
 
     QSize size = window->surfaceSize();
+    const Window::Anchors anchors = interface->anchors();
     if ((anchors & Window::AnchorLeft) && (anchors & Window::AnchorRight)) {
         size.setWidth(0);
     }

tests/quicktest.qml

@@ -0,0 +1,115 @@
+/*
+ *   SPDX-FileCopyrightText: 2021 Aleix Pol Gonzalez <aleix.pol_gonzalez@mercedes-benz.com>
+ *
+ *   SPDX-License-Identifier: LGPL-3.0-or-later
+ */
+
+import QtQuick 2.15
+import QtQuick.Window 2.15
+import org.kde.layershell 1.0 as LayerShell
+
+Item
+{
+    Text {
+        text: "A normal Window"
+        anchors.centerIn: parent
+    }
+
+    Window {
+        LayerShell.Window.anchors: LayerShell.Window.AnchorLeft
+        LayerShell.Window.layer: LayerShell.Window.LayerBackground
+        LayerShell.Window.exclusionZone: -1
+
+        Component.onCompleted: {
+            console.log("xxxx", LayerShell.Window.AnchorLeft, LayerShell.Window.anchors)
+        }
+
+        width: 200
+        height: 150
+        Rectangle {
+            anchors.fill: parent
+            color: "green"
+
+            Text {
+                anchors.centerIn: parent
+                text: "left bg"
+            }
+        }
+        visible: true
+    }
+
+
+    Window {
+        LayerShell.Window.scope: "dock"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorLeft
+        LayerShell.Window.layer: LayerShell.Window.LayerTop
+        LayerShell.Window.exclusionZone: width
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "left"
+            }
+        }
+        visible: true
+    }
+
+    Window {
+        LayerShell.Window.scope: "normal"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorRight
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "right"
+            }
+        }
+        visible: true
+    }
+
+    Window {
+        LayerShell.Window.scope: "normal"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorTop
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "top"
+            }
+        }
+        visible: true
+    }
+
+    Window {
+        LayerShell.Window.scope: "normal"
+        LayerShell.Window.anchors: LayerShell.Window.AnchorBottom
+
+        width: 100
+        height: 100
+        Rectangle {
+            anchors.fill: parent
+            color: "red"
+
+            Text {
+                anchors.centerIn: parent
+                text: "bottom"
+            }
+        }
+        visible: true
+    }
+}