Set layer overlay for dropdown terminal on wayland

CMakeLists.txt

@@ -24,6 +24,7 @@ endif()
 set(LXQTBT_MINIMUM_VERSION "2.0.0")
 set(QT_MINIMUM_VERSION "6.3.0")
 set(QT_MAJOR_VERSION "6")
+set(SHELLQT_MINIMUM_VERSION "6.0.0")
 
 find_package(Qt6Core ${QT_MINIMUM_VERSION} REQUIRED)
 find_package(Qt6Gui ${QT_MINIMUM_VERSION} REQUIRED)
@@ -40,6 +41,8 @@ if (BUILD_TESTS)
     find_package(Qt6 ${QT_MINIMUM_VERSION} CONFIG REQUIRED Test)
 endif()
 
+find_package(LayerShellQt ${SHELLQT_MINIMUM_VERSION} REQUIRED)
+
 include(LXQtPreventInSourceBuilds)
 include(FindPkgConfig)
 pkg_check_modules(LIBCANBERRA libcanberra)
@@ -211,6 +214,7 @@ target_link_libraries(${EXE_NAME}
     Qt6::Gui
     Qt6::Widgets
     qtermwidget6
+    LayerShellQtInterface
     util
 )
 if(QXT_FOUND)

src/mainwindow.cpp

@@ -42,6 +42,10 @@
 #include "qterminalapp.h"
 #include "dbusaddressable.h"
 
+#include <LayerShellQt/Shell>
+#include <LayerShellQt/Window>
+
+
 typedef std::function<bool(MainWindow&, QAction *)> checkfn;
 Q_DECLARE_METATYPE(checkfn)
 
@@ -166,6 +170,21 @@ MainWindow::~MainWindow()
 
 void MainWindow::enableDropMode()
 {
+    if (QGuiApplication::platformName() == QStringLiteral("wayland"))
+    {
+        winId();
+        if (QWindow *win = windowHandle())
+        {
+            if (LayerShellQt::Window* layershell = LayerShellQt::Window::get(win))
+            {
+                layershell->setLayer(LayerShellQt::Window::Layer::LayerOverlay);
+                layershell->setKeyboardInteractivity(LayerShellQt::Window::KeyboardInteractivityOnDemand);
+                LayerShellQt::Window::Anchors anchors = {LayerShellQt::Window::AnchorTop};
+                layershell->setAnchors(anchors);
+            }
+        }
+    }
+
     setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint | Qt::CustomizeWindowHint);
 
     m_dropLockButton = new QToolButton(this);