两张图片对比clip功能

html 复制代码
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>图片拖动Clip对比功能</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            padding: 20px;
        }

        .container {
            max-width: 800px;
            width: 100%;
            height: 500px;
            border-radius: 12px;
            overflow: hidden;
            background-color: white;
            box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            border: 1px solid #e0e0e0;
        }

        .image-comparison {
            position: relative;
            height: 100%;
            width: 100%;
            display: flex;
            overflow: hidden;
            touch-action: none;
            user-select: none;
        }

        .image-comparison img {
            display: block;
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center center;
        }

        .clip-item {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            user-select: none;
            will-change: clip-path;
            clip-path: inset(0 0 0 50%);
            transition: clip-path 0.1s ease-out;
        }

        .handle-container {
            position: absolute;
            top: 0;
            height: 100%;
            background: none;
            border: 0;
            padding: 0;
            pointer-events: all;
            appearance: none;
            outline: 0;
            transform: translate3d(-50%, 0, 0);
            left: 50%;
            cursor: ew-resize;
            z-index: 10;
        }

        .handle-root {
            display: flex;
            flex-direction: column;
            place-items: center;
            height: 100%;
            cursor: ew-resize;
            pointer-events: none;
            color: white;
        }

        .handle-line {
            flex-grow: 1;
            height: 100%;
            width: 2px;
            background-color: currentColor;
            pointer-events: auto;
            box-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
        }

        .handle-button {
            display: grid;
            grid-auto-flow: column;
            gap: 8px;
            place-content: center;
            flex-shrink: 0;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            border: 2px solid currentColor;
            pointer-events: auto;
            backdrop-filter: blur(7px);
            background-color: rgba(0, 0, 0, 0.125);
            box-shadow: 0 0 4px rgba(0, 0, 0, 0.35);
        }

        .handle-arrow {
            width: 0;
            height: 0;
            border-top: 8px solid transparent;
            border-right: 10px solid currentColor;
            border-bottom: 8px solid transparent;
        }

        .handle-arrow:last-child {
            transform: rotate(180deg);
        }

        .info {
            position: absolute;
            bottom: 20px;
            left: 20px;
            background: rgba(0, 0, 0, 0.7);
            color: white;
            padding: 10px 15px;
            border-radius: 8px;
            font-size: 14px;
            z-index: 5;
        }

        @media (max-width: 768px) {
            .container {
                height: 400px;
            }
            
            .handle-button {
                width: 48px;
                height: 48px;
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="image-comparison" id="imageComparison">
            <img alt="Original Image" src="./img/demo5.png">
            
            <div class="clip-item" id="clipItem">
                <img alt="Translated Image" src="./img/demo6.png">
            </div>
            
            <button class="handle-container" id="handleContainer" 
                    aria-label="拖动移动或聚焦并使用箭头键" 
                    aria-orientation="horizontal" 
                    aria-valuemin="0" 
                    aria-valuemax="100" 
                    aria-valuenow="50" 
                    role="slider">
                <div class="handle-root">
                    <div class="handle-line"></div>
                    <div class="handle-button">
                        <div class="handle-arrow"></div>
                        <div class="handle-arrow"></div>
                    </div>
                    <div class="handle-line"></div>
                </div>
            </button>
            
            <div class="info">
                拖动中间的滑块来对比两张图片
            </div>
        </div>
    </div>

    <script>
        class ImageComparison {
            constructor(container) {
                this.container = container;
                this.clipItem = container.querySelector('#clipItem');
                this.handleContainer = container.querySelector('#handleContainer');
                this.isDragging = false;
                this.currentPosition = 50; // 初始位置 50%
                
                this.init();
            }
            
            init() {
                this.bindEvents();
                this.updatePosition(this.currentPosition);
            }
            
            bindEvents() {
                // 鼠标事件
                this.handleContainer.addEventListener('mousedown', this.handleMouseDown.bind(this));
                document.addEventListener('mousemove', this.handleMouseMove.bind(this));
                document.addEventListener('mouseup', this.handleMouseUp.bind(this));
                
                // 触摸事件
                this.handleContainer.addEventListener('touchstart', this.handleTouchStart.bind(this));
                document.addEventListener('touchmove', this.handleTouchMove.bind(this));
                document.addEventListener('touchend', this.handleTouchEnd.bind(this));
                
                // 键盘事件
                this.handleContainer.addEventListener('keydown', this.handleKeyDown.bind(this));
                
                // 防止拖动时选中文本
                this.container.addEventListener('selectstart', (e) => e.preventDefault());
            }
            
            handleMouseDown(e) {
                e.preventDefault();
                this.isDragging = true;
                this.container.style.cursor = 'ew-resize';
                this.clipItem.style.transition = 'none';
            }
            
            handleMouseMove(e) {
                if (!this.isDragging) return;
                
                e.preventDefault();
                const rect = this.container.getBoundingClientRect();
                const x = e.clientX - rect.left;
                const percentage = (x / rect.width) * 100;
                
                this.updatePosition(Math.max(0, Math.min(100, percentage)));
            }
            
            handleMouseUp() {
                this.isDragging = false;
                this.container.style.cursor = '';
                this.clipItem.style.transition = 'clip-path 0.1s ease-out';
            }
            
            handleTouchStart(e) {
                e.preventDefault();
                this.isDragging = true;
                this.clipItem.style.transition = 'none';
            }
            
            handleTouchMove(e) {
                if (!this.isDragging) return;
                
                e.preventDefault();
                const touch = e.touches[0];
                const rect = this.container.getBoundingClientRect();
                const x = touch.clientX - rect.left;
                const percentage = (x / rect.width) * 100;
                
                this.updatePosition(Math.max(0, Math.min(100, percentage)));
            }
            
            handleTouchEnd() {
                this.isDragging = false;
                this.clipItem.style.transition = 'clip-path 0.1s ease-out';
            }
            
            handleKeyDown(e) {
                const step = 5;
                
                switch(e.key) {
                    case 'ArrowLeft':
                        e.preventDefault();
                        this.updatePosition(Math.max(0, this.currentPosition - step));
                        break;
                    case 'ArrowRight':
                        e.preventDefault();
                        this.updatePosition(Math.min(100, this.currentPosition + step));
                        break;
                    case 'Home':
                        e.preventDefault();
                        this.updatePosition(0);
                        break;
                    case 'End':
                        e.preventDefault();
                        this.updatePosition(100);
                        break;
                }
            }
            
            updatePosition(percentage) {
                this.currentPosition = percentage;
                
                // 更新clip-path
                this.clipItem.style.clipPath = `inset(0 0 0 ${percentage}%)`;
                
                // 更新滑块位置
                this.handleContainer.style.left = `${percentage}%`;
                
                // 更新ARIA属性
                this.handleContainer.setAttribute('aria-valuenow', Math.round(percentage));
            }
        }
        
        // 初始化
        document.addEventListener('DOMContentLoaded', () => {
            const container = document.getElementById('imageComparison');
            new ImageComparison(container);
        });
    </script>
</body>
</html>
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