ImInputBinder

Input binding widget for Dear ImGui library. The widget was developed for the Universal System Emulator. Check out the project for an example of usage.

How to build and run the example

Linux

In the project directory execute:

mkdir build
cd build
cmake -DBUILD_EXAMPLE=ON ..
make
./ImInputBinderExample

How to use

Prerequisites

• C++11 (C++17 to run the example),
• imgui.h available the in include path.

1) Get the sources

You can add the widget to your project directly by downloading ZIP of the repo and adding ImInputBinder.h to your include path and ImInputBinder.cpp to your build.

Or, if you use CMake, you can download the sources using this CMake snippet:

include(FetchContent)
FetchContent_Declare(
        ImInputBinder
        GIT_REPOSITORY https://github.com/andreondra/ImInputBinder
        GIT_PROGRESS TRUE
)
FetchContent_MakeAvailable(ImInputBinder)
include_directories(${ImInputBinder_SOURCE_DIR})
file(GLOB ImInputBinder_sources ${ImInputBinder_SOURCE_DIR}/ImInputBinder.cpp)

# Do not forget to add ${ImInputBinder_sources} to your build. For example like this:
add_executable(your_app mySource1.cpp mySource2.cpp mySourceX.cpp ${ImInputBinder_sources})

2) Add to code

Setup

You have to create an instance of ImInputBinder:

ImInputBinder imInputBinder;

Then you add actions. The action is a representation of a reaction to the specified user input. It consists of:

• name_id: a unique name,
• key: a key (or a button) which will trigger callbacks,
• pressCallback and releaseCallback: callbacks for press and release of the specified key/button,

imInputBinder.addAction({
    .name_id ="Example Up Arrow",
    .key = ImGuiKey_UpArrow,
    .pressCallback = [](){ std::cout << "Example Up Arrow press callback." << std::endl; },
    .releaseCallback = [](){ std::cout << "Example Up Arrow release callback." << std::endl; },
});

You can also add multiple actions at a same time using addActions:

imInputBinder.addActions({
    {
        .name_id = "Test A key press",
        .key = ImGuiKey_A,
        .pressCallback = [](){ std::cout << "A key pressed!" << std::endl; }
    },
    {
            .name_id = "Test B key release",
            .key = ImGuiKey_B,
            .releaseCallback = [](){ std::cout << "B key released!" << std::endl; }
    },
});

Then you can load existing bindings from a file. You can specify a file name, stream in a binary mode, or nothing and a default file will be used.

imInputBinder.loadBindings("myfile.iib");

Running

After the setup is complete, you have the call imInputBinder.update() periodically to check for keys pressed.

To show a configuration dialog, call imInputBinder.renderEditorWindow() to render the dialog in its own window, or imInputBinder.renderEditor() to render only contents (you have to provide the ImGui window).

Saving the state

To save the state, you can call imInputBinder.saveBindings() with same parameters as loadBindings().

License

This project is licensed under the MIT license.

© 2023, Ondrej Golasowski