layer_world.cpp

#include <QApplication>
#include <QMainWindow>
#include <QPushButton>
#include <LayerShellQt/shell.h>
#include <LayerShellQt/window.h>

int main(int argc, char **argv) {
	QApplication app(argc, argv);

	LayerShellQt::Shell::useLayerShell();

	QMainWindow main_window;
	QPushButton button;
	button.setText("foobar");
	main_window.setCentralWidget(&button);

	/* Ensure platform window is created */
	main_window.winId();

	QWindow *window = main_window.windowHandle();
	LayerShellQt::Window *layershell = LayerShellQt::Window::get(window);

	layershell->setAnchors({
		LayerShellQt::Window::Anchor::AnchorTop,
		LayerShellQt::Window::Anchor::AnchorLeft,
		LayerShellQt::Window::Anchor::AnchorRight
	});
	layershell->setLayer(LayerShellQt::Window::Layer::LayerBottom);

	layershell->setExclusiveZone(30);
	main_window.resize(0, 30);

	main_window.show();
	return app.exec();
}

CMakeLists.txt additions:

find_package(LayerShellQt REQUIRED)
target_link_libraries(example PRIVATE LayerShellQtInterface Qt5::Widgets)