Example mod

Here's a modified example mod for Geode with some custom API used to change the hook behaviour.

#include <Geode/Geode.hpp>
using namespace geode::prelude;

#define OPENHACK_OPTIONAL
#include <prevter.openhack/api/openhack.hpp>

static bool s_addCustomButton = false;

class $modify(MenuLayer) {
    bool init() {
        if (!MenuLayer::init()) {
            return false;
        }

        // Return early if the custom button is disabled
        if (!s_addCustomButton) {
            return true;
        }

        // Everything else is the same as in example geode mod
        auto myButton = CCMenuItemSpriteExtra::create(
                CCSprite::createWithSpriteFrameName("GJ_likeBtn_001.png"),
                this,
                menu_selector(MyMenuLayer::onMyButton)
        );

        auto menu = this->getChildByID("bottom-menu");
        menu->addChild(myButton);
        myButton->setID("my-button"_spr);
        menu->updateLayout();
        return true;
    }
};

$execute {
    using namespace openhack; // for convenience

    // Check if OpenHack is actually loaded
    if (!isLoaded()) return;

    // Register our own custom window
    ui::createWindow("My cool feature", []() {
        if (ui::button("Show alert")) {
            FLAlertLayer::create(
                    "OpenHack API",
                    "Hello from my custom mod!",
                    "OK"
            )->show();
        }
        if (ui::checkbox("Add custom button", &s_addCustomButton)) {
            FLAlertLayer::create(
                    "Custom Button",
                    fmt::format("Custom button is now {}!", s_addCustomButton ? "enabled" : "disabled").c_str(),
                    "OK"
            )->show();
        }
    });
}