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#pragma once
#include <Corrade/Containers/StringView.h>
#include <Magnum/Math/Color.h>
#include <imgui.h>
#include <imgui_internal.h>
namespace floormat::imgui {
struct raii_wrapper final
{
using F = void(*)(void);
raii_wrapper(F fn) : dtor{fn} {}
raii_wrapper() = default;
~raii_wrapper() { if (dtor) dtor(); }
raii_wrapper(const raii_wrapper&) = delete;
raii_wrapper& operator=(const raii_wrapper&) = delete;
raii_wrapper& operator=(raii_wrapper&&) = delete;
raii_wrapper(raii_wrapper&& other) noexcept : dtor{other.dtor} { other.dtor = nullptr; }
inline operator bool() const noexcept { return dtor != nullptr; }
F dtor = nullptr;
};
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper begin_window(Containers::StringView name = {}, ImGuiWindowFlags_ flags = ImGuiWindowFlags_None)
{
if (name.isEmpty())
name = "floormat editor";
if (ImGui::Begin(name.data(), nullptr, flags))
return {&ImGui::End};
else
return {};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper begin_main_menu()
{
if (ImGui::BeginMainMenuBar())
return {&ImGui::EndMainMenuBar};
else
return {};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper begin_menu(Containers::StringView name, bool enabled = true)
{
if (ImGui::BeginMenu(name.data(), enabled))
return {&ImGui::EndMenu};
else
return {};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper begin_list_box(Containers::StringView name, ImVec2 size = {})
{
if (ImGui::BeginListBox(name.data(), size))
return {&ImGui::EndListBox};
else
return {};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper tree_node(Containers::StringView name, ImGuiTreeNodeFlags_ flags = ImGuiTreeNodeFlags_None)
{
if (ImGui::TreeNodeEx(name.data(), flags))
return {&ImGui::TreePop};
else
return {};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper push_style_var(ImGuiStyleVar_ var, Vector2 value)
{
ImGui::PushStyleVar(var, {value[0], value[1]});
return {[]{ ImGui::PopStyleVar(); }};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper push_style_var(ImGuiStyleVar_ var, float value)
{
ImGui::PushStyleVar(var, value);
return {[]{ ImGui::PopStyleVar(); }};
}
[[nodiscard]] [[maybe_unused]] static inline raii_wrapper push_style_color(ImGuiCol_ var, const Color4& value)
{
ImGui::PushStyleColor(var, {value[0], value[1], value[2], value[3]});
return {[]{ ImGui::PopStyleColor(); }};
}
[[maybe_unused]] static inline void text(const char* str, std::size_t len, ImGuiTextFlags_ flags = ImGuiTextFlags_NoWidthForLargeClippedText)
{
ImGui::TextEx(str, str + len, flags);
}
template<std::size_t N>
[[maybe_unused]] static inline void text(const char (&buf)[N], ImGuiTextFlags_ flags = ImGuiTextFlags_NoWidthForLargeClippedText)
{
static_assert(N > 0);
ImGui::TextEx(buf, buf + N - 1, flags);
}
struct style_saver final
{
style_saver() : style{ImGui::GetStyle()} {}
~style_saver() { ImGui::GetStyle() = style; }
private:
ImGuiStyle style;
};
struct font_saver final
{
font_saver(float size) : font_saver{*ImGui::GetCurrentContext(), size} {}
~font_saver();
private:
font_saver(ImGuiContext& ctx, float size);
float font_size, font_base_size;
};
font_saver::~font_saver()
{
auto& ctx = *ImGui::GetCurrentContext();
ctx.FontSize = font_size;
ctx.FontBaseSize = font_base_size;
}
font_saver::font_saver(ImGuiContext& ctx, float size) :
font_size{ctx.FontSize}, font_base_size{ctx.FontBaseSize}
{
ctx.FontSize = size;
ctx.FontBaseSize = size;
}
} // namespace floormat::imgui
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