ScreenChangedHook

let ScreenType = {
    start_screen: "start_screen",
    hud: "hud_screen",
    ingame: "in_game_play_screen",
    survival_inv: "survival_inventory_screen",
    creative_inv: "creative_inventory_screen",
    pause_screen: "pause_screen",
    options_screen: "options_screen",
    exit_dialog: " -  - gui.warning.exitGameWarning"
};

function screenChangedHook(screenType) {

    if(screenType == ScreenType.hud || screenType == ScreenType.ingame) {
        //show the button here
    } else {
        //hide it here
    }

}