UNION_HUTB/target/classes/static/components/sign/index.vue

<template>
    <div class="signature-wrap">
        <canvas id="canvas"></canvas>
        <div class="action-buttons">
            <button @click="clear" class="action-button-danger" type="button">清空</button>
            <button @click="undo" class="action-button-warning" type="button">撤销</button>
            <button @click="save" class="action-button-primary" type="button">确定</button>
        </div>
    </div>
</template>

<script>
// function a() {
//     // 检查当前屏幕方向
//     if (window.orientation === 0 || window.orientation === 180) {
//         // 竖屏状态
//         console.log("竖屏状态")
//         alert("当前不支持竖屏，请将设备调整为横屏！")
//     } else {
//         // 横屏状态，执行禁止旋转的操作
//         alert("当前不支持横屏，请将设备调整为竖屏！")
//         // 可以在这里使内容固定在竖屏方向
//         const innerWidth = window.innerWidth
//         const innerHeight = window.innerHeight
//         alert(innerHeight)
//         alert(innerWidth)
//     }
// }
//
// window.addEventListener("orientationchange", a)
// a()

let signature = null
module.exports = {
    name: "sysSignature",
    data() {
        return {
            content: null,
            initialized: false
        }
    },
    methods: {
        clear() {
            signature.clear()
        },
        undo() {
            signature.undo()
        },
        rotate() {
            signature.getRotateCanvas(90)
        },
        save() {
            if (signature.isEmpty()) {
                alert("请签字后再保存")
                return
            }
            // const png = signature.getPNG()
            //旋转一下 横过来
            const rotateCanvas = signature.getRotateCanvas(-90)
            this.$emit("save", rotateCanvas.toDataURL())
        },

        initSignature() {
            if (this.initialized) return;

            const canvas = document.getElementById("canvas");
            if (!canvas) return;

            // 检查 canvas 是否已有有效尺寸
            const rect = canvas.getBoundingClientRect();
            if (rect.width <= 0 || rect.height <= 0) {
                // 尺寸无效，稍后重试
                setTimeout(() => this.initSignature(), 50);
                return;
            }

            const padding = 30;
            const width = window.innerWidth - padding;
            const height = window.innerHeight - padding;

            // 设置 CSS 尺寸
            canvas.style.width = `${width}px`;
            canvas.style.height = `${height}px`;

            // 高清绘制
            const dpr = window.devicePixelRatio || 1;
            canvas.width = width * dpr;
            canvas.height = height * dpr;

            // 销毁旧实例（防止重复）
            if (signature) {
                signature.clear();
            }

            signature = new SmoothSignature(canvas, {
                width: width,
                height: height,
                scale: dpr,
                minWidth: 4,
                maxWidth: 10,
                color: "#000000"
            });

            this.initialized = true;
        }
    },
    mounted() {
        // 延迟初始化，确保 DOM 渲染完成
        this.$nextTick(() => {
            this.initSignature();
        });
    },

    beforeDestroy() {
        signature = null;
        this.initialized = false;
    }
}
</script>

<style scoped>
.signature-wrap {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 15px;
    background: #ffffff;
}

.signature-wrap .action {
    width: 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.signature-wrap .action-buttons {
    white-space: nowrap;
    transform: rotate(90deg);
    display: flex;
    column-gap: 10px;
    position: fixed;
    bottom: 0px;
    left: 60px;
    transform: rotate(90deg);
    display: flex;
    flex-direction: column;
    row-gap: 20px;
}

.action-buttons button {
    color: #ffffff;
    position: relative;
    display: inline-block;
    box-sizing: border-box;
    height: auto;
    padding: 3px 12px;
    margin: 0;
    font-size: 15px;
    line-height: 1.4;
    text-align: center;
    border-radius: 4px;
    cursor: pointer;
    transition: opacity 0.15s ease;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.action-button-primary {
    background-color: #1677ff;
    border: 1px solid #1677ff;
}

.action-button-danger {
    background-color: #ff3141;
    border: 1px solid #ff3141;
}

.action-button-warning {
    background-color: #ff8f1f;
    border: 1px solid #ff8f1f;
}

.signature-wrap canvas {
    flex: 1;
    border-radius: 10px;
    border: 2px dashed #ccc;
}
</style>