qt5 based implementation

[mgerhardy]

note: this is not integrated into the build - I have no idea of premake in combination with qt
but I still hope it can serve as a reference

I tried to match your coding style - if something isn't how you wanna it to be, please let me know.

[mgerhardy]

just for reference (as no premake is there) - here is the cmake build script that i'm using.

set(LIB nativefiledialog)
set(SRCS nfd_common.c nfd.h)

set(EXTRA_INCLUDE_DIRS)
set(EXTRA_LIBRARIES)

if (APPLE)
    set(SRCS ${SRCS} nfd_cocoa.mm)
    set(EXTRA_LIBRARIES ${EXTRA_LIBRARIES} AppKit)
endif()

if (MSVC)
    set(SRCS ${SRCS} nfd_win.cpp)
endif()

set(QT FALSE)
if (LINUX)
    find_package(Qt5Widgets)
    if (${Qt5Widgets_FOUND})
        set(SRCS ${SRCS} nfd_qt.cpp)
        set(QT TRUE)
    else()
        pkg_check_modules(GTK3 gtk+-3.0)
        if (GTK3_FOUND)
            link_directories(${GTK3_LIBRARY_DIRS})
            add_definitions(${GTK3_CFLAGS_OTHER})
            set(SRCS ${SRCS} nfd_gtk.c)
            set(EXTRA_INCLUDE_DIRS "${EXTRA_INCLUDE_DIRS} ${GTK3_INCLUDE_DIRS}")
            set(EXTRA_LIBRARIES "${EXTRA_LIBRARIES} ${GTK3_LIBRARIES}")
        else()
            find_program(ZENITY zenity)
            if(ZENITY)
                set(SRCS ${SRCS} nfd_zenity.c)
            else()
                message(FATAL "Could not find any working dialog")
            endif()
        endif()
    endif()
endif()

add_library(${LIB} ${SRCS})

if (QT)
    qt5_use_modules(${LIB} Widgets)
endif()

if (EXTRA_INCLUDE_DIRS)
    target_include_directories(${LIB} PRIVATE ${EXTRA_INCLUDE_DIRS})
endif()
if (EXTRA_LIBRARIES)
    target_link_libraries(${LIB} ${EXTRA_LIBRARIES})
endif()

[MrSapps]

I think this is wrong, the output should be utf8

[mlabbe]

I see the primary benefit of NFD being avoiding large libraries like QT. If you are linking QT, why would you want NFD?

[mgerhardy]

There is also gtk; )
And it just allows me to us the lib on different desktop environments with native support for the directory picker.

[mlabbe]

Unfortunately, Qt's Cmake is incompatible with our build system. I will not be maintaining Cmake or incorporating it into NFD. Pre-generating build scripts with Premake as we do is far better for our users.

I have no idea how to maintainably support Qt via Premake and I find the rationale for Qt's existence in NFD at all circumspect, as one of the main goals is to allow library users to avoid linking Qt or Wx. There is also a question of license compatibility which I am not even going to render an opinion on at this point.

I am going to pass on this PR. Thanks for giving it a shot and paying attention to NFD though.