InitializeWithWindow.h

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#pragma once
#include <cppxaml/Controls.h>
#include <cppxaml/XamlWindow.h>
#include <type_traits>
#include <ShObjIdl_core.h>
#include <winrt/Windows.UI.Xaml.Controls.Primitives.h>
namespace cppxaml {
    
    auto SetXamlRoot(winrt::Windows::Foundation::IInspectable obj, cppxaml::xaml::XamlRoot root) {
        if (auto fe = obj.try_as<winrt::Windows::UI::Xaml::FrameworkElement>()) {
            return fe.XamlRoot(root);
        }
        else if (auto fb = obj.try_as<winrt::Windows::UI::Xaml::Controls::Primitives::FlyoutBase>()) {
            return fb.XamlRoot(root);
        }
        throw winrt::hresult_error(E_NOINTERFACE);
    }
    
    template<typename TWindow>
#ifndef DOXY
    std::enable_if_t<
        !std::is_same_v<TWindow, cppxaml::XamlWindow*> &&
        !std::is_same_v<TWindow, HWND>>
#else
    void
#endif
        InitializeWithWindow(winrt::Windows::Foundation::IInspectable obj, TWindow /*winrt::Microsoft::UI::Xaml::Window*/ w) {
#ifdef USE_WINUI3
        if (auto iww = obj.try_as<IInitializeWithWindow>()) {
            HWND hwnd{};
            w.as<IWindowNative>()->get_WindowHandle(&hwnd);
            iww->Initialize(hwnd);
        }
        else if (auto window = w.as<cppxaml::xaml::Window>()) {
            obj.XamlRoot(window.Content().XamlRoot());
        }
        else
#else
        {
            SetXamlRoot(obj, w.XamlRoot());
        }
#endif
    }
 
    bool InitializeWithWindow(winrt::Windows::Foundation::IInspectable obj, HWND hwnd) {
        if (auto iww = obj.try_as<IInitializeWithWindow>()) {
            iww->Initialize(hwnd);
            return true;
        }
        return false;
    }
 
    void InitializeWithWindow(winrt::Windows::Foundation::IInspectable obj, const cppxaml::XamlWindow* xw) {
        if (!InitializeWithWindow(obj, xw->hwnd())) {
            SetXamlRoot(obj, xw->GetUIElement<cppxaml::xaml::FrameworkElement>().XamlRoot());
        }
    }
 
    template<typename TUIElement, typename TWindow>
 #ifndef DOXY
    std::enable_if_t<std::is_assignable_v<cppxaml::xaml::UIElement, TUIElement> &&
        !std::is_same_v<TWindow, const cppxaml::XamlWindow*>, void>
#else
    void
#endif
        InitializeWithWindow(cppxaml::details::Wrapper<TUIElement> obj, TWindow /*winrt::Microsoft::UI::Xaml::Window*/ w) {
        return InitializeWithWindow(*obj, w);
    }
}