function gradioApp() {
 const elems = document.getElementsByTagName('gradio-app');
 const elem = elems.length === 0 ? document : elems[0];
 if (elem !== document) elem.getElementById = function (id) { return document.getElementById(id); };
 return elem.shadowRoot ? elem.shadowRoot : elem;
}

function get_uiCurrentTab() {
 return gradioApp().querySelector('#tabs button.selected');
}

function get_uiCurrentTabContent() {
 return gradioApp().querySelector('.tabitem[id^=tab_]:not([style*="display: none"])');
}

const uiAfterUpdateCallbacks = [];
const uiUpdateCallbacks = [];
const uiLoadedCallbacks = [];
const uiTabChangeCallbacks = [];
const optionsChangedCallbacks = [];
let uiCurrentTab = null;
let uiAfterUpdateTimeout = null;

function onAfterUiUpdate(callback) {
 uiAfterUpdateCallbacks.push(callback);
}

function onUiUpdate(callback) {
 uiUpdateCallbacks.push(callback);
}

function onUiLoaded(callback) {
 uiLoadedCallbacks.push(callback);
}

function onUiTabChange(callback) {
 uiTabChangeCallbacks.push(callback);
}

function onOptionsChanged(callback) {
 optionsChangedCallbacks.push(callback);
}

function executeCallbacks(queue, arg) {
 // if (!uiLoaded) return
 for (const callback of queue) {
 try {
 callback(arg);
 } catch (e) {
 console.error("error running callback", callback, ":", e);
 }
 }
}

function scheduleAfterUiUpdateCallbacks() {
 clearTimeout(uiAfterUpdateTimeout);
 uiAfterUpdateTimeout = setTimeout(() => executeCallbacks(uiAfterUpdateCallbacks, 500));
}

let executedOnLoaded = false;

document.addEventListener('DOMContentLoaded', () => {
 const mutationObserver = new MutationObserver((m) => {
 if (!executedOnLoaded && gradioApp().querySelector('#txt2img_prompt')) {
 executedOnLoaded = true;
 executeCallbacks(uiLoadedCallbacks);
 }
 executeCallbacks(uiUpdateCallbacks, m);
 scheduleAfterUiUpdateCallbacks();
 const newTab = get_uiCurrentTab();
 if (newTab && (newTab !== uiCurrentTab)) {
 uiCurrentTab = newTab;
 executeCallbacks(uiTabChangeCallbacks);
 }
 });
 mutationObserver.observe(gradioApp(), { childList: true, subtree: true });
});

/**
 * Add a ctrl+enter as a shortcut to start a generation
 */
document.addEventListener('keydown', (e) => {
 let handled = false;
 if (e.key !== undefined) {
 if ((e.key === 'Enter' && (e.metaKey || e.ctrlKey || e.altKey))) handled = true;
 } else if (e.keyCode !== undefined) {
 if ((e.keyCode === 13 && (e.metaKey || e.ctrlKey || e.altKey))) handled = true;
 }
 if (handled) {
 button = get_uiCurrentTabContent().querySelector('button[id$=_generate]');
 if (button) button.click();
 e.preventDefault();
 }
});

/**
 * checks that a UI element is not in another hidden element or tab content
 */
function uiElementIsVisible(el) {
 if (el === document) return true;
 const computedStyle = getComputedStyle(el);
 const isVisible = computedStyle.display !== 'none';
 if (!isVisible) return false;
 return uiElementIsVisible(el.parentNode);
}

function uiElementInSight(el) {
 const clRect = el.getBoundingClientRect();
 const windowHeight = window.innerHeight;
 const isOnScreen = clRect.bottom > 0 && clRect.top < windowHeight;
 return isOnScreen;
}