merlin/examples/stopwatch.html at main · marcodpt/merlin · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="shortcut icon" type="image/x-icon" href="../favicon.ico">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/water.css@2/out/water.css">
    <title>Stopwatch - The Merlin JS framework</title>
  </head>
  <body>
    <main>
      <h1><img src="../favicon.ico"> Stopwatch</h1>
      <h2 text:="clock">0.000</h2>
      <button onclick:="start">Start</button>
      <button onclick:="stop">Stop</button>
      <button onclick:="reset">Reset</button>
    </main>
    <script type="module">
      import {app} from "../index.js"

      app({
        node: document.body.querySelector('main'),
        init: {
          clock: 0,
          offset: 0
        },
        register: (update, dispatch) => ({
          reset: () => update(state => ({
            ...state,
            clock: 0
          })),
          start: () => {
            var tick
            update(state => {
              tick = !state.offset
              return {
                ...state,
                offset: Date.now()
              }
            })
            if (tick) {
              dispatch('tick')
            }
          },
          stop: () => update(state => ({
            ...state,
            offset: 0
          })),
          tick: () => {
            update(({offset, clock}) => {
              if (offset) {
                const now = Date.now()
                setTimeout(() => dispatch('tick'), 100)
                return {
                  clock: clock + (now - offset) / 1000,
                  offset: now
                }
              } else {
                return {offset, clock}
              }
            })
          }
        }),
        view: ({clock}, events) => ({
          clock: clock.toFixed(3),
          ...events
        })
      })
    </script>
  </body>
</html>