AnimTestbed/3rdparty/imgui-node-editor/examples/application/source/imgui_extra_keys.h

49 lines
2.9 KiB
C++

# pragma once
# include <imgui.h>
# include <type_traits>
// https://stackoverflow.com/a/8597498
# define DECLARE_HAS_NESTED(Name, Member) \
\
template<class T> \
struct has_nested_ ## Name \
{ \
typedef char yes; \
typedef yes(&no)[2]; \
\
template<class U> static yes test(decltype(U::Member)*); \
template<class U> static no test(...); \
\
static bool const value = sizeof(test<T>(0)) == sizeof(yes); \
};
# define DECLARE_KEY_TESTER(Key) \
DECLARE_HAS_NESTED(Key, Key) \
struct KeyTester_ ## Key \
{ \
template <typename T> \
static int Get(typename std::enable_if<has_nested_ ## Key<ImGuiKey_>::value, T>::type*) \
{ \
return T::Key; \
} \
\
template <typename T> \
static int Get(typename std::enable_if<!has_nested_ ## Key<ImGuiKey_>::value, T>::type*) \
{ \
return -1; \
} \
}
DECLARE_KEY_TESTER(ImGuiKey_F);
DECLARE_KEY_TESTER(ImGuiKey_D);
static inline int GetEnumValueForF()
{
return KeyTester_ImGuiKey_F::Get<ImGuiKey_>(nullptr);
}
static inline int GetEnumValueForD()
{
return KeyTester_ImGuiKey_D::Get<ImGuiKey_>(nullptr);
}