ImGui Handler

Simple library to handle an OpenGL window with Dear ImGui integration

Features

• Class based windows management system
• Built-in OpenGL event handling
• Built-in ImGui handling

Implementation (CMake project)

CMake FetchContent

1. Add the following lines to your CMakeLists.txt:

   include(FetchContent)
   FetchContent_Declare(ImGuiHandler
        GIT_REPOSITORY "https://github.com/Fattorino/ImGuiHandler.git"
        GIT_TAG "origin/master"
        SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/includes/ImGuiHandler"
   )
   FetchContent_MakeAvailable(ImGuiHandler)
   

   target_link_libraries(YourProject ImGuiHandler)
   

2. Make sure you have the following dependencies available for find_package():
   • Dear ImGui
   • OpenGL
   • GLFW

Manually

1. Download and copy, or clone the repo inside your project
2. Add the following lines to your CMakeLists.txt:

   add_subdirectory(path/to/ImGuiHandler)
   target_link_libraries(YourProject ImGuiHandler)
   

3. Make sure you have the following dependencies available for find_package():
   • Dear ImGui
   • OpenGL
   • GLFW

Basic Usage

DemoWindow.h

#include <ImGuiHandler.h>

class DemoWindow : public appLayer
{
private:
    float var = 200.f;

public:
    void onCreate() override;

    void update() override;

    void menuBar() override;
};

DemoWindow.cpp

#include "DemoWindow.h

void DemoWindow::onCreate() { var = 200.f; }

void DemoWindow::update()
{
    ImGui::Begin("DemoWindow");
    ImGui::SliderFloat("Drag me", &var, 0.f, 100.f);
    ImGui::Text("VAL: %f", var);
    ImGui::End();
}

void DemoWindow::menuBar()
{
    if (ImGui::BeginMenu("Demo"))
    {
        if (ImGui::MenuItem("Win")) { }
        if (ImGui::MenuItem("dow")) { }
        ImGui::EndMenu();
    }
}

main.cpp

#include "DemoWindow.h"

void menuBar()
{
    if (ImGui::BeginMenu("Main parent window"))
    {
        if (ImGui::MenuItem("Menu")) { }
        if (ImGui::MenuItem("Bar")) { }
        ImGui::EndMenu();
    }
}

int main()
{
    if (!IGH.init("Example", 650, 200))
        return 1;

    ImGui::GetIO().IniFilename = nullptr;

    IGH.pushLayer<DemoWindow>();

    IGH.menuBar(menuBar);
    IGH.setActiveWin(0);

    bool done = false;
    while (!done)
    {
        IGH.loop(&done);
    }

    IGH.end();
    return 0;
}