robert
/
xjs


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Callbacks (update / begin / complete) - Animal.js</title>
    <link rel="stylesheet" href="demo.css">
    <style>
        .circle {
            width: 50px;
            height: 50px;
            background-color: var(--highlight-color);
            border-radius: 50%;
        }
        .value {
            font-size: 20px;
            font-weight: bold;
            color: #fff;
            margin-bottom: 20px;
            font-family: monospace;
        }
        .demo-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            width: 100%;
        }
    </style>
</head>
<body>

    <div class="container">
        <div style="font-size: 10px; font-weight: bold; letter-spacing: 1px; color: #ff4b4b; margin-bottom: 20px;">ANIMATION > CALLBACKS</div>
        
        <h1>Callbacks</h1>
        <p class="description">
            Pass <code class="inline">begin</code>, <code class="inline">update</code>, and <code class="inline">complete</code>
            to <code class="inline">animate()</code>. The <code class="inline">update</code> callback receives
            <code class="inline">{ target, progress, time }</code>.
        </p>

        <h2>Accepts</h2>
        <p>A <code class="inline">Function</code>. For <code class="inline">update</code>, the first argument is an object: <code class="inline">{ target, progress, time }</code>.</p>
        
        <h2>Default</h2>
        <p><code class="inline">noop</code></p>
        
        <div style="background: rgba(33, 150, 243, 0.1); border-left: 4px solid #2196F3; padding: 15px; border-radius: 4px; margin-bottom: 30px; font-size: 14px;">
            <div style="font-weight: bold; color: #2196F3; margin-bottom: 5px; font-size: 10px; letter-spacing: 1px;">INFO</div>
            <div style="color: #90caf9; margin-bottom: 10px;">Callbacks are configured per animation via the params object.</div>
            <div style="background: rgba(0,0,0,0.3); padding: 10px; border-radius: 4px; font-family: monospace; font-size: 12px; color: #a9b7c6; white-space: pre-wrap;">
xjs('.box').animate({
  x: 200,
  update: ({ progress }) => console.log(progress)
});
            </div>
        </div>

        <div class="box-container">
            <div class="box-header">
                <div class="box-title">Callbacks code example</div>
                <div class="tabs">
                    <div class="tab active" onclick="switchTab('js')">JavaScript</div>
                    <div class="tab" onclick="switchTab('html')">HTML</div>
                    <div class="tab" onclick="switchTab('css')">CSS</div>
                </div>
            </div>

            <!-- JS Code View -->
            <div id="js-code" class="code-view active">
<span class="kwd">const</span> $value <span class="punc">=</span> document.querySelector<span class="punc">(</span><span class="str">'.value'</span><span class="punc">);</span>

<span class="kwd">let</span> updates <span class="punc">=</span> <span class="num">0</span><span class="punc">;</span>

<span class="fun">xjs</span><span class="punc">(</span><span class="str">'.circle'</span><span class="punc">)</span>.<span class="fun">animate</span><span class="punc">({</span>
  x<span class="punc">:</span> <span class="str">'16rem'</span><span class="punc">,</span>
  loop<span class="punc">:</span> Infinity<span class="punc">,</span>
  direction<span class="punc">:</span> <span class="str">'alternate'</span><span class="punc">,</span>
  begin<span class="punc">:</span> <span class="punc">()</span> <span class="punc">=></span> $value.textContent <span class="punc">=</span> <span class="str">'0'</span><span class="punc">,</span>
  update<span class="punc">:</span> <span class="punc">({</span> progress <span class="punc">})</span> <span class="punc">=></span> $value.textContent <span class="punc">=</span> Math.round(progress <span class="punc">*</span> <span class="num">100</span>) <span class="punc">+</span> <span class="str">'%'</span>
<span class="punc">}</span><span class="punc">)</span><span class="punc">;</span>
            </div>

            <!-- HTML Code View -->
            <div id="html-code" class="html-view">
<span class="tag">&lt;div</span> <span class="attr">class</span>=<span class="val">"value"</span><span class="tag">&gt;</span>0<span class="tag">&lt;/div&gt;</span>
<span class="tag">&lt;div</span> <span class="attr">class</span>=<span class="val">"circle"</span><span class="tag">&gt;&lt;/div&gt;</span>
            </div>

            <pre id="css-code" class="css-view">.circle {
  width: 50px;
  height: 50px;
  background-color: var(--highlight-color);
  border-radius: 50%;
}
.value {
  font-size: 20px;
  font-weight: bold;
  color: #fff;
  margin-bottom: 20px;
  font-family: monospace;
}
.demo-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}</pre>

            <div class="feature-desc">
                <strong>功能说明：</strong>通过 <code class="inline">begin/update/complete</code> 回调拿到动画进度与时间，适合做进度条、数字跟随、状态同步等“联动”效果。
            </div>

            <!-- Live Demo -->
            <div class="demo-visual">
                <div class="demo-content">
                    <div class="value">0</div>
                    <div class="circle"></div>
                </div>
            </div>
            
            <div class="action-bar">
                <button class="play-btn" onclick="runDemo()">REPLAY</button>
                <button class="play-btn secondary" onclick="pauseDemo()">PAUSE</button>
                <button class="play-btn secondary" onclick="resumeDemo()">RESUME</button>
            </div>
        </div>

    </div>

    <script src="highlight_css.js"></script>
    <script src="../xjs.js"></script>
    <script>
        const utils = {
            $: (selector) => document.querySelectorAll(selector)
        };

        function switchTab(tab) {
            document.querySelectorAll('.tab').forEach(t => t.classList.remove('active'));
            document.querySelectorAll('.code-view, .html-view, .css-view').forEach(v => v.classList.remove('active'));
            
            if (tab === 'js') {
                document.querySelector('.tabs .tab:nth-child(1)').classList.add('active');
                document.getElementById('js-code').classList.add('active');
            } else if (tab === 'html') {
                document.querySelector('.tabs .tab:nth-child(2)').classList.add('active');
                document.getElementById('html-code').classList.add('active');
            } else {
                document.querySelector('.tabs .tab:nth-child(3)').classList.add('active');
                document.getElementById('css-code').classList.add('active');
            }
        }

        let __demoControls = [];

        function runDemo() {
                        const $value = document.querySelector('.value');
            const $circle = document.querySelector('.circle');
            $circle.style.transform = 'none';
            $value.textContent = '0';

            __demoControls = [];
            __demoControls.push(xjs('.circle').animate({
                x: '16rem',
                duration: 1000,
                loop: Infinity, 
                direction: 'alternate',
                begin: () => { $value.textContent = '0'; },
                update: ({ progress }) => { $value.textContent = Math.round(progress * 100) + '%'; },
                complete: () => { /* not reached when loop is Infinity */ }
            }));
        }

        function pauseDemo() {
            __demoControls.forEach(c => { try { c?.pause?.(); } catch {} });
        }

        function resumeDemo() {
            __demoControls.forEach(c => {
                try {
                    if (typeof c?.resume === 'function') c.resume();
                    else if (typeof c?.play === 'function') c.play();
                } catch {}
            });
        }
        
        setTimeout(runDemo, 500);
    </script>
</body>
</html>