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Add support for the WinUI DispatcherQueue #648

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Merged
kennykerr merged 1 commit into from
Jun 2, 2020
Merged

Add support for the WinUI DispatcherQueue #648

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4 changes: 4 additions & 0 deletions cppwinrt/code_writers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -3168,6 +3168,10 @@ struct __declspec(empty_bases) produce_dispatch_to_overridable<T, D, %>
{
w.write(strings::base_coroutine_system);
}
else if (namespace_name == "Microsoft.System")
{
w.write(strings::base_coroutine_system_winui);
}
else if (namespace_name == "Windows.UI.Core")
{
w.write(strings::base_coroutine_ui_core);
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1 change: 1 addition & 0 deletions cppwinrt/cppwinrt.vcxproj
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Expand Up @@ -56,6 +56,7 @@
<ClInclude Include="..\strings\base_coroutine_system.h" />
<ClInclude Include="..\strings\base_coroutine_threadpool.h" />
<ClInclude Include="..\strings\base_coroutine_ui_core.h" />
<ClInclude Include="..\strings\base_coroutine_system_winui.h" />
<ClInclude Include="..\strings\base_deferral.h" />
<ClInclude Include="..\strings\base_delegate.h" />
<ClInclude Include="..\strings\base_error.h" />
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3 changes: 3 additions & 0 deletions cppwinrt/cppwinrt.vcxproj.filters
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Expand Up @@ -157,6 +157,9 @@
<ClInclude Include="..\strings\base_includes.h">
<Filter>strings</Filter>
</ClInclude>
<ClInclude Include="..\strings\base_coroutine_system_winui.h">
<Filter>strings</Filter>
</ClInclude>
</ItemGroup>
<ItemGroup>
<ResourceCompile Include="$(OutDir)version.rc" />
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50 changes: 50 additions & 0 deletions strings/base_coroutine_system_winui.h
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Original file line number Diff line number Diff line change
@@ -0,0 +1,50 @@

WINRT_EXPORT namespace winrt
{
[[nodiscard]] inline auto resume_foreground(
Microsoft::System::DispatcherQueue const& dispatcher,
Microsoft::System::DispatcherQueuePriority const priority = Microsoft::System::DispatcherQueuePriority::Normal) noexcept
{
struct awaitable
{
awaitable(Microsoft::System::DispatcherQueue const& dispatcher, Microsoft::System::DispatcherQueuePriority const priority) noexcept :
m_dispatcher(dispatcher),
m_priority(priority)
{
}

bool await_ready() const noexcept
{
return false;
}

bool await_resume() const noexcept
{
return m_queued;
}

bool await_suspend(std::experimental::coroutine_handle<> handle)
{
return m_dispatcher.TryEnqueue(m_priority, [handle, this]
{
m_queued = true;
handle();
});
}

private:
Microsoft::System::DispatcherQueue const& m_dispatcher;
Microsoft::System::DispatcherQueuePriority const m_priority;
bool m_queued{};
};

return awaitable{ dispatcher, priority };
};

#ifdef __cpp_coroutines
inline auto operator co_await(Microsoft::System::DispatcherQueue const& dispatcher)
{
return resume_foreground(dispatcher);
}
#endif
}