Qt5: QML hello world with Cmake (+nix package manager)

README.md

Demonstration of QML with Qt5 + meson + nix

If you have nix installed compile and run with:

$ nix build
$ ./result/bin/demo 

Explaination: we load the .qml file with qrc:///main.qml: it uses for that the file qml.qrc (the name is not important) that lists the resource files. This 'qml.qrc file is then given to resources in meson.build in order to compile the resources and include them in the final binary.

derivation_demo.nix

{ lib
, stdenv
, meson
, qt5
, wrapQtAppsHook
, pkg-config
, ninja
}:
stdenv.mkDerivation rec {
  pname = "";
  version = "";

  src = ./.;
  nativeBuildInputs = [ meson ninja pkg-config wrapQtAppsHook ];
  buildInputs = [
    qt5.full
  ];
}

flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1668650906,
        "narHash": "sha256-JuiYfDO23O8oxUUOmhQflmOoJovyC5G4RjcYQMQjrRE=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "3a86856a13c88c8c64ea32082a851fefc79aa700",
        "type": "github"
      },
      "original": {
        "id": "nixpkgs",
        "type": "indirect"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  description = "A very basic flake";

  outputs = { self, nixpkgs }: let
    pkgs = nixpkgs.legacyPackages.x86_64-linux;
  in {

    packages.x86_64-linux.default = pkgs.libsForQt5.callPackage ./derivation_demo.nix {};

  };
}

main.cpp

//https://riptutorial.com/qml/example/14475/creating-a-qtquick-window-from-cplusplus
#include <QGuiApplication>
#include <QQmlApplicationEngine>

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:///main.qml")));
	    
    return app.exec();
}

main.qml

import QtQuick 2.5
import QtQuick.Window 2.2

Window { // Must be this type to be loaded by QQmlApplicationEngine.
    visible: true
    title: qsTr("Hello World")
    Text {
        text: qsTr("Hello World")
        anchors.centerIn: parent
    }
}

meson.build

project('demo', 'cpp')
qt5 = import('qt5')
qt5_dep = dependency('qt5', modules: ['Core', 'Gui', 'Qml'])
resources = qt5.compile_resources(name: 'main.cpp', sources: [ 'qml.qrc' ])
executable('demo', 'main.cpp', resources,
           dependencies : qt5_dep,
           install : true)

qml.qrc

<RCC>
    <qresource prefix="/">
        <file>main.qml</file>
    </qresource>
</RCC>