openFrameworks / ImGui toggle button. styled and with animation

ofApp.cpp

//2 snippets from here:
//https://github.com/ocornut/imgui/issues/1537

//1. styled rounded toggle button with animation
//add into ofApp.cpp
namespace ImGui {
    void ToggleButton(const char* str_id, bool* v)
    {
        ImVec2 p = ImGui::GetCursorScreenPos();
        ImDrawList* draw_list = ImGui::GetWindowDrawList();

        float height = ImGui::GetFrameHeight();
        float width = height * 1.55f;
        float radius = height * 0.50f;

        ImGui::InvisibleButton(str_id, ImVec2(width, height));
        if (ImGui::IsItemClicked())
            *v = !*v;

        float t = *v ? 1.0f : 0.0f;

        ImGuiContext& g = *GImGui;
        float ANIM_SPEED = 0.08f;
        if (g.LastActiveId == g.CurrentWindow->GetID(str_id))// && g.LastActiveIdTimer < ANIM_SPEED)
        {
            float t_anim = ImSaturate(g.LastActiveIdTimer / ANIM_SPEED);
            t = *v ? (t_anim) : (1.0f - t_anim);
        }

        ImU32 col_bg;
        if (ImGui::IsItemHovered())
            col_bg = ImGui::GetColorU32(ImLerp(ImVec4(0.78f, 0.78f, 0.78f, 1.0f), ImVec4(0.64f, 0.83f, 0.34f, 1.0f), t));
        else
            col_bg = ImGui::GetColorU32(ImLerp(ImVec4(0.85f, 0.85f, 0.85f, 1.0f), ImVec4(0.56f, 0.83f, 0.26f, 1.0f), t));

        draw_list->AddRectFilled(p, ImVec2(p.x + width, p.y + height), col_bg, height * 0.5f);
        draw_list->AddCircleFilled(ImVec2(p.x + radius + t * (width - radius * 2.0f), p.y + radius), radius - 1.5f, IM_COL32(255, 255, 255, 255));
    }
}

//--

//2. rectangle box button with colors
static bool enable_7m = false;  // default value, the button is disabled 
static float b = 1.0f; //  test whatever color you need from imgui_demo.cpp e.g.
static float c = 0.5f; // 
static int i = 3;

( some code...  )

if (enable_7m == true)
{

    ImGui::PushID(" 7m ");
    ImGui::PushStyleColor(ImGuiCol_Button, (ImVec4)ImColor::HSV(i/7.0f, b, b));
    ImGui::PushStyleColor(ImGuiCol_ButtonHovered, (ImVec4)ImColor::HSV(i/7.0f, b, b));
    ImGui::PushStyleColor(ImGuiCol_ButtonActive, (ImVec4)ImColor::HSV(i/7.0f, c, c));
    ImGui::Button(" 7m ");
    if (ImGui::IsItemClicked(0))
    {
                        enable_7m = !enable_7m;
    }
    ImGui::PopStyleColor(3);
    ImGui::PopID();
}
else
{
    if (ImGui::Button(" 7m "))
       enable_7m = true;
}

+ add wherever you need in the code (e.g. after some action):