Thank you for downloading Nana C++ Library

#include <nana/gui.hpp>
#include <nana/gui/widgets/label.hpp>
#include <nana/gui/widgets/button.hpp>

int main()
{
    using namespace nana;

    //Define a form.
    form fm;

    //Define a label and display a text.
    label lab{fm, "Hello, <bold blue size=16>Nana C++ Library</>"};
    lab.format(true);

    //Define a button and answer the click event.
    button btn{fm, "Quit"};
    btn.events().click([&fm]{
        fm.close();
    });

    //Layout management
    fm.div("vert <><<><weight=80% text><>><><weight=24<><button><>><>");
    fm["text"]<<lab;
    fm["button"] << btn;
    fm.collocate();
	
    //Show the form
    fm.show();

    //Start to event loop process, it blocks until the form is closed.
    exec();
}

#include <nana/gui.hpp>
#include <nana/gui/widgets/label.hpp>
#include <nana/gui/widgets/button.hpp>

int main()
{
    using namespace nana;

    form fm;
    fm.caption("Calculator");

    fm.div("vert<proc weight=10%><result weight=15%>"
        "<weight=2>"
        "<keys margin=2 grid=[4, 5] gap=2 collapse(0,4,2,1)>");

    label procedure(fm, "(1 + 7) X 9 +"), result(fm, "72");

    //Make the label right aligned.
    procedure.text_align(align::right);
    result.text_align(align::right);
    result.typeface(paint::font("", 14, true));

    fm["proc"] << procedure;
    fm["result"] << result;

    std::vector<std::unique_ptr<button>> keys;

    paint::font keyfont("", 10, true);

    wchar_t keys_char[] = L"C\261%/789X456-123+0.=";
    for (auto kchar : keys_char)
    {
        keys.emplace_back(std::make_unique<button>(fm,
                             to_utf8(std::wstring(1, kchar))));	//C++14
        auto& key = *keys.back();
        key.typeface(keyfont);

        if ('=' == kchar)
        {
            key.bgcolor(color_rgb(0x7ACC));
            key.fgcolor(colors::white);
        }
        fm["keys"] << key;
    }

    fm.collocate();
    fm.show();
    exec();
}