https://www.372dirt.com/cp/resources/views/test_slot/slot/plugins/AnimShot.js

1export default function AnimShot(classDef) {
2    return function(opts) {
3        classDef.call(this, opts);
4
5        let oldLeave;
6        let currentOptions = {};
7
8        const oldShow = this.show;
9        this.show = async (comp, opts={}) => {
10            currentOptions = opts;
11
12            // perform leave animation from previous show call:
13            await invoke(oldLeave);
14
15            oldLeave = opts.onLeave;
16            await oldShow(() => comp, opts);
17
18            // perform enter animation:
19            await invoke(opts.onEnter);
20
21        };
22
23        const oldAnswer = this.answer;
24        this.answer = async (...args) => {
25            await invoke(currentOptions.onAnswer ?? currentOptions.onLeave);
26            return await oldAnswer(...args);
27        };
28    };
29}
30
31function invoke(func) {
32    if (typeof func === "function") {
33        return func();
34    }
35    return Promise.resolve();
36}