ImApp 2.0.2

ImApp

ImApp is a lightweight C# application framework for building native desktop applications with Dear ImGui, GLFW, and OpenGL.

It provides a small application/window layer while keeping Dear ImGui as the main UI API.

Status: Early development

Features

• Native desktop windows via GLFW
• Dear ImGui integration
• OpenGL rendering
• Configurable window options
• Borderless and resizable windows
• Maximized windows
• Transparent windows
• Topmost windows
• Mouse passthrough
• Dear ImGui docking
• Optional full-window host
• Target FPS limiter
• Embedded Noto Sans font
• .NET 10

Requirements

• .NET 10 SDK/runtime
• OpenGL 3.2+
• GLFW-compatible desktop environment

Installation

Install ImApp using the .NET CLI:

dotnet add package ImApp

Or add it directly to your .csproj:

<PackageReference Include="ImApp" Version="0.2.0" />

Quick Start

using Hexa.NET.ImGui;
using ImApp;

using var app = new App(new WindowOptions
{
    Title = "My Window",
    Width = 800,
    Height = 600
});

app.Run(() =>
{
    ImGui.Begin("Hello");

    ImGui.Text("Hello from ImApp!");

    if (ImGui.Button("Click Me"))
    {
        Console.WriteLine("Button clicked");
    }

    ImGui.End();
});

Window Options

ImApp provides a WindowOptions class for configuring the application window.

Example:

using var app = new App(new WindowOptions
{
    Title = "ImApp Window",
    Width = 1200,
    Height = 800,

    Decorated = true,
    Resizable = true,

    TargetFps = 144,
    FontSize = 18
});

Host Window

By default, ImApp provides a host ImGui window.

HostWindow = true

You can disable the host window and manage ImGui windows yourself:

using var app = new App(new WindowOptions
{
    HostWindow = false
});

This is useful when you want complete control over the Dear ImGui layout.

Docking

Dear ImGui docking can be enabled through WindowOptions.

using Hexa.NET.ImGui;
using ImApp;

using var app = new App(new WindowOptions
{
    Title = "ImApp Docking",
    Width = 1200,
    Height = 800,
    DockingEnabled = true
});

app.Run(() =>
{
    ImGui.ShowDemoWindow();
});

Transparent / Borderless Window

ImApp supports transparent and borderless windows.

using var app = new App(new WindowOptions
{
    Decorated = false,
    Transparent = true,
    MousePassthrough = true
});

This can be useful for overlays and custom desktop UI.

Font

ImApp includes Noto Sans Regular and loads it automatically.

You can configure the font size through WindowOptions:

using var app = new App(new WindowOptions
{
    FontSize = 18
});

This avoids requiring Noto Sans to be installed on the user's system.

Dependencies

ImApp is built using:

• Dear ImGui
• Hexa.NET.ImGui
• Hexa.NET.GLFW
• Hexa.NET.OpenGL
• Hexa.NET.ImGui.Backends.GLFW
• Hexa.NET.ImGui.Backends.OpenGL3
• HexaGen.Runtime

License

ImApp is released under the MIT License.