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ImReflect

Reflection-based ImGui wrapper.

Automatically generate ImGui widgets for your structs and types.

struct GameSettings {
    int volume = 50;
    float sensitivity = 1.0f;
    bool fullscreen = false;
};
IMGUI_REFLECT(GameSettings, volume, sensitivity, fullscreen)

// Single Call:
ImReflect::Input("Settings", settings);

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Features

• 🎯 Less boilerplate - One macro, automatic UI
• 🔧 Configurable - Fluent builder API for customizing widgets
• 📦 Batteries included - Works with primitives, enums, STL containers, smart pointers
• 🎨 Extensible - Add your own types without modifying the library
• 📄 Single header - Drop in and go

📖 All Types | 📦 Download Latest Release

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Quick Start

1. Installation

Download the single header from releases:

#include "ImReflect.hpp"

2. Reflect Your Struct

struct GameSettings {
    int volume = 50;
    float sensitivity = 1.0f;
    bool fullscreen = false;
};
IMGUI_REFLECT(GameSettings, volume, sensitivity, fullscreen)

3. Render UI

GameSettings settings;
ImReflect::Input("Settings", settings);

Done! ImReflect automatically generates appropriate widgets for each member.

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Supported Types

Most standard types work out of the box. See Wiki for complete reference.

// Primitives
static bool my_bool = true;
ImReflect::Input("my bool", my_bool);

static int my_int = 42;
ImReflect::Input("my int", my_int);

static float my_float = 3.14f;
ImReflect::Input("my float", my_float);

static std::string my_string = "Hello ImReflect!";
ImReflect::Input("my string", my_string);

static MyEnum my_enum = MyEnum::Option1;
ImReflect::Input("my enum", my_enum);

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Most of STL is also included.

std::tuple<int, float, std::string> my_tuple = { 1, 2.0f, "three" };
ImReflect::Input("my tuple", my_tuple);

std::map<std::string, float> my_map = { {"one", 1.0f}, {"two", 2.0f} };
ImReflect::Input("my map", my_map);

std::vector<int> my_vec = { 1, 2, 3 };
ImReflect::Input("my vec", my_vec);

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Configuration

Customize widgets using the fluent builder pattern.

Global Type Settings

Apply settings to all instances of a type:

auto config = ImSettings();
config.push<int>()
    .as_slider()
    .min(0)
    .max(100)
.pop();

GameSettings settings;
ImReflect::Input("Settings", settings, config);

Per-Member Settings

Configure specific struct members:

auto config = ImSettings();
config.push_member<&GameSettings::volume>()
    .as_slider()
    .min(0)
    .max(100)
.pop()
.push_member<&GameSettings::sensitivity>()
    .as_drag()
    .min(0.1f)
    .max(2.0f)
.pop();

ImReflect::Input("Settings", settings, config);

Enum Widgets

Choose how enums are displayed:

enum class GraphicsQuality { Low, Medium, High, Ultra };

struct Graphics {
    GraphicsQuality quality = GraphicsQuality::Medium;
    GraphicsQuality shadows = GraphicsQuality::High;
    GraphicsQuality textures = GraphicsQuality::High;
};
IMGUI_REFLECT(Graphics, quality, shadows, textures)

auto config = ImSettings();
config.push_member<&Graphics::quality>()
    .as_dropdown()  // Dropdown menu
.pop()
.push_member<&Graphics::shadows>()
    .as_slider()    // Slider control
.pop()
.push_member<&Graphics::textures>()
    .as_radio()     // Radio buttons
.pop();

static Graphics gfx;
ImReflect::Input("Graphics", gfx, config);

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Response Handling

Track user interactions with return values:

struct GameSettings {
    int volume = 50;
    float sensitivity = 1.0f;
    bool fullscreen = false;
};

GameSettings settings;
ImResponse response = ImReflect::Input("Settings", settings);

// Check if entire struct changed
if (response.get<GameSettings>().is_changed()) {
    // settings has changed
}

// Check if any int member changed
if (response.get<int>().is_changed()) {
    // any int has changed
}

// Check specific member
if (response.get_member<&GameSettings::volume>().is_changed()) {
    // volume specifically has changed
}

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Advanced Usage

Custom Types

Add support for your own types using tag invoke:

struct vec3 {
	float x = 0, y = 0, z = 0;
};

void tag_invoke(ImReflect::ImInput_t, const char* label, vec3& value, ImSettings& settings, ImResponse& response) {
	auto& vec3_response = response.get<vec3>();

	bool changed = ImGui::InputFloat3(label, &value.x);
	if (changed) vec3_response.changed();

	/* Check hovered, activated, etc*/
	ImReflect::Detail::check_input_states(vec3_response);
}

Custom Settings

Add configurable settings for your custom types:

template<>
struct ImReflect::type_settings<vec3> : ImRequired<vec3> {
private:
	bool _as_color = false;
public:
	// If vec3 needs to be rendered as a color picker
	type_settings<vec3>& as_color(const bool v = true) { _as_color = v; RETURN_THIS_T(vec3); }
	bool is_color() { return _as_color; }
};

void tag_invoke(ImReflect::ImInput_t, const char* label, vec3& value, ImSettings& settings, ImResponse& response) {
	/* Get the vec3 settings and response */
	auto& vec3_settings = settings.get<vec3>();
	auto& vec3_response = response.get<vec3>();

	const bool render_as_color = vec3_settings.is_color();

	bool changed = false;
	if (render_as_color) {
		changed = ImGui::ColorEdit3(label, &value.x);
	} else {
		changed = ImGui::InputFloat3(label, &value.x);
	}
	if (changed) vec3_response.changed();

	/* Check hovered, activated, etc*/
	ImReflect::Detail::check_input_states(vec3_response);
}

// Usage
ImSettings config;
config.push<vec3>()
		.as_color()
	.pop();

static vec3 my_vec3;
ImReflect::Input("my vec3", my_vec3, config);

Requirements for custom settings:

• Use template<> specialization
• Define as ImReflect::type_settings<YOUR_TYPE>
• Inherit from ImRequired
• Return type_settings<YOUR_TYPE>& from setters for chaining

Overriding Built-in Types

Don't like the default implementation? Override it:

void tag_invoke(ImReflect::ImInput_t, const char* label, int& value, ImSettings& settings, ImResponse& response) {
    // Your custom implementation for int
}

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Resolution Order

When rendering a type, ImReflect searches in this order at compile time:

1. User implementations - Your tag_invoke functions
2. Library implementations - Built-in ImReflect types
3. Reflection - Types with IMGUI_REFLECT macro

This means you can always override library behavior with your own implementations.

If no implementation is found:

error C2338: No suitable Input implementation found for type T

Check the console for the missing type. If you think it should be supported, open an issue!

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Building

Option 1: Single Header (Recommended)

Download ImReflect.hpp from releases:

#include "ImReflect.hpp"

Includes all dependencies except ImGui.

Option 2: Multiple Headers

Clone the repository and include the main headers: ImReflect_entry.hpp, ImReflect_helper.hpp, ImReflect_primitives.hpp, ImReflect_std.hpp, and external dependencies.

Dependencies

• magic_enum - Included in single header
• visit_struct - Included in single header
• ImGui - You need to include this separately
  • imgui_stdlib - for std::string
• C++ 17

Documentation

• Type Settings Reference - Complete API documentation
• Fluent Builder Pattern - Details on the configuration system

Contributing

Feedback, issues, and pull requests are welcome! This project is part of my university work, so everything is a learning experience.

License

MIT License - See LICENSE

As a student, credit or a quick note about what you're using it for is greatly appreciated! It motivates me to keep contributing to open source!