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#ifndef IMGUI_CONTEXT_HPP
#define IMGUI_CONTEXT_HPP
#include "gl_context.hpp"
#include "sdl_context.hpp"
#include "sdl_main_window.hpp"
#include <imgui/imgui.h>
namespace bookmouse {
class ImguiContext {
public:
ImguiContext(GlContext& glContext, SdlContext& sdlContext, SdlMainWindow& mainWindow);
~ImguiContext();
const ImGuiIO& getIO() const;
void setIOFlag(ImGuiConfigFlags_ flag) const;
bool processEvent(SDL_Event& event) const;
void startFrame() const;
void render() const;
private:
SdlMainWindow& m_mainWindow;
};
template <typename Expr, typename Cleanup>
class ConditionalRaii {
public:
template <typename... Args>
ConditionalRaii(Args&&... args) : m_expr{false}
{
Expr expr{};
m_expr = expr(std::forward<Args>(args)...);
}
~ConditionalRaii()
{
Cleanup cleanup{};
if (m_expr) {
cleanup();
}
}
ConditionalRaii(const ConditionalRaii& rhs) = delete;
ConditionalRaii(ConditionalRaii&& rhs) = delete;
ConditionalRaii& operator=(const ConditionalRaii& rhs) = delete;
ConditionalRaii& operator=(ConditionalRaii&& rhs) = delete;
operator bool() const
{
return m_expr;
}
private:
bool m_expr;
};
#define Imgui ImGui
#define STRUCT_FUNCTOR(FUNCTOR_NAME, FUNCTOR_FUNCTION) \
struct FUNCTOR_NAME { \
auto operator()() -> decltype(FUNCTOR_FUNCTION()) \
{ \
return FUNCTOR_FUNCTION(); \
} \
};
#define STRUCT_FUNCTOR_ARGS(FUNCTOR_NAME, FUNCTOR_FUNCTION) \
struct FUNCTOR_NAME { \
template <typename... Args> \
auto operator()(Args&&... args) -> /* FORCE BREAK */ \
decltype(FUNCTOR_FUNCTION(std::forward<Args>(args)...)) \
{ \
return FUNCTOR_FUNCTION(std::forward<Args>(args)...); \
} \
};
STRUCT_FUNCTOR_ARGS(ImguiBeginMenuBar, Imgui::BeginMenuBar)
STRUCT_FUNCTOR(ImguiEndMenuBar, Imgui::EndMenuBar)
using ImguiMenuBar = ConditionalRaii<ImguiBeginMenuBar, ImguiEndMenuBar>;
STRUCT_FUNCTOR_ARGS(ImguiBeginMenu, Imgui::BeginMenu)
STRUCT_FUNCTOR(ImguiEndMenu, Imgui::EndMenu)
using ImguiMenu = ConditionalRaii<ImguiBeginMenu, ImguiEndMenu>;
STRUCT_FUNCTOR_ARGS(ImguiBeginPopupModal, Imgui::BeginPopupModal)
// N.B. EndPopup is needed for BeginPopupModal
STRUCT_FUNCTOR(ImguiEndPopupModal, Imgui::EndPopup)
using ImguiPopupModal = ConditionalRaii<ImguiBeginPopupModal, ImguiEndPopupModal>;
// STRUCT_FUNCTOR_ARGS(Imgui
#undef Imgui
#undef STRUCT_FUNCTOR
#undef STRUCT_FUNCTOR_ARGS
} // namespace bookmouse
#endif
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