utils.h

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#pragma once
 
namespace cppxaml {
 
#ifdef USE_WINUI3
    namespace xaml = winrt::Microsoft::UI::Xaml;
#else
    namespace xaml = winrt::Windows::UI::Xaml;
#endif
 
 
    namespace utils {
        inline auto tolower(std::wstring_view sv) {
            std::wstring copy(sv);
            std::transform(copy.begin(), copy.end(), copy.begin(), [](wchar_t x) { return (wchar_t)::tolower(x); });
            return copy;
        }
 
        template<template<typename...> typename TOutContainer = std::vector, typename TInContainer, typename UnaryOp>
        auto transform(TInContainer const& iterable, UnaryOp&& unary_op) {
            using result_t = std::invoke_result_t<UnaryOp, typename TInContainer::value_type>;
            TOutContainer<result_t> out{};
            auto o = std::inserter(out, out.end());
            for (auto i = iterable.cbegin(); i != iterable.cend(); i++) {
                o = unary_op(*i);
            }
            return out;
        }
 
        template<template<typename...> typename TOutContainer = std::vector, typename TInContainer, typename UnaryOp>
        auto transform_with_index(TInContainer const& iterable, UnaryOp&& unary_op) {
            using result_t = std::invoke_result_t<UnaryOp, typename TInContainer::value_type, typename TInContainer::const_iterator::difference_type>;
            TOutContainer<result_t> out{};
            auto o = std::inserter(out, out.end());
            for (auto i = iterable.cbegin(); i != iterable.cend(); i++) {
                o = unary_op(*i, i - iterable.cbegin());
            }
            return out;
        }
 
    }
 
    template<typename T = cppxaml::xaml::DependencyObject>
    T FindChildByName(cppxaml::xaml::DependencyObject d, std::wstring_view name) {
        if (auto fe = d.try_as<cppxaml::xaml::FrameworkElement>()) {
            if (fe.Name() == name) return d.as<T>();
        }
        for (int i = 0; i < cppxaml::xaml::Media::VisualTreeHelper::GetChildrenCount(d); i++) {
            auto r = FindChildByName<T>(cppxaml::xaml::Media::VisualTreeHelper::GetChild(d, i), name);
            if (r) return r.as<T>();
        }
        return nullptr;
    }
 
 
}
 
#ifndef DOXY
#define IF_ASSIGNABLE_CONTROL(XAMLTYPE)     std::enable_if_t<std::is_assignable_v<cppxaml::xaml::Controls::XAMLTYPE, T>, cppxaml::details::Wrapper<T>>
#define IF_ASSIGNABLE_CONTROL_TITEMS(XAMLTYPE, TITEMS)     std::enable_if_t<std::is_assignable_v<cppxaml::xaml::Controls::XAMLTYPE, T>, cppxaml::details::Wrapper<T, TITEMS>>
#define DOXY_RT(...) auto
#else
#define IF_ASSIGNABLE_CONTROL(XAMLTYPE)     cppxaml::details::Wrapper<T>
#define IF_ASSIGNABLE_CONTROL_TITEMS(XAMLTYPE, TITEMS)     cppxaml::details::Wrapper<T, TITEMS>
#define DOXY_RT(...) __VA_ARGS__
#endif