Switch from QT to Slint

CMakeLists.txt

@@ -1,7 +1,44 @@
-cmake_minimum_required(VERSION 3.14)
-
-project(lali VERSION 0.1 LANGUAGES CXX)
+cmake_minimum_required(VERSION 3.21)
+project(lali LANGUAGES CXX)
 
+set(CMAKE_CXX_STANDARD 23)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+set(SLINT_FEATURE_RENDERER_SKIA ON)
+set(SLINT_FEATURE_RENDERER_SOFTWARE ON)
 
-add_subdirectory(src)
+find_package(Slint QUIET)
+if (NOT Slint_FOUND)
+  message("Slint could not be located in the CMake module search path. Downloading it from Git and building it locally")
+  include(FetchContent)
+  FetchContent_Declare(
+    Slint
+    GIT_REPOSITORY https://github.com/slint-ui/slint.git
+    # `release/1` will auto-upgrade to the latest Slint >= 1.0.0 and < 2.0.0
+    # `release/1.0` will auto-upgrade to the latest Slint >= 1.0.0 and < 1.1.0
+    GIT_TAG release/1.8
+    SOURCE_SUBDIR api/cpp
+  )
+  FetchContent_MakeAvailable(Slint)
+endif (NOT Slint_FOUND)
+
+add_executable(lali src/main.cpp)
+target_include_directories(lali PRIVATE "external")
+target_link_libraries(lali PRIVATE Slint::Slint)
+slint_target_sources(
+	lali ui/app-window.slint
+	NAMESPACE ui
+	LIBRARY_PATHS selenite=${CMAKE_CURRENT_SOURCE_DIR}/external/selenite/index.slint
+)
+
+add_subdirectory(external/rei-json)
+
+target_include_directories(lali PRIVATE "external/rei-json/include")
+target_link_libraries(lali PRIVATE rei-json)
+
+target_link_libraries(lali PRIVATE crypto)
+target_link_libraries(lali PRIVATE ssl)
+
+# On Windows, copy the Slint DLL next to the application binary so that it's found.
+if (WIN32)
+    add_custom_command(TARGET lali POST_BUILD COMMAND ${CMAKE_COMMAND} -E copy $<TARGET_RUNTIME_DLLS:lali> $<TARGET_FILE_DIR:lali> COMMAND_EXPAND_LISTS)
+endif()