caimei-applets-store/components/views/cm-number-box/cm-number-box.vue

<template>
    <view class="cm-number-box">
        <view @click="_calcValue('minus')" class="cm-number-box__minus cm-number-box-btns">
            <text
                class="cm-number-box--text"
                :class="{ 'cm-number-box--disabled': inputValue <= min || disabled }"
                :style="{ color }"
            >
                -
            </text>
        </view>
        <input
            :disabled="disabled"
            @focus="_onFocus"
            @blur="_onBlur"
            class="cm-number-box__value"
            type="number"
            v-model="inputValue"
            :style="{ background, color }"
        />
        <view @click="_calcValue('plus')" class="cm-number-box__plus cm-number-box-btns">
            <text
                class="cm-number-box--text"
                :class="{ 'cm-number-box--disabled': inputValue >= max || disabled }"
                :style="{ color }"
            >
                +
            </text>
        </view>
    </view>
</template>
<script>
/**
 * NumberBox 数字输入框
 * @description 带加减按钮的数字输入框
 * @tutorial https://ext.dcloud.net.cn/plugin?id=31
 * @property {Number} value 输入框当前值
 * @property {Number} min 最小值
 * @property {Number} max 最大值
 * @property {Number} step 每次点击改变的间隔大小
 * @property {String} background 背景色
 * @property {String} color 字体颜色（前景色）
 * @property {Boolean} disabled = [true|false] 是否为禁用状态
 * @event {Function} change 输入框值改变时触发的事件，参数为输入框当前的 value
 * @event {Function} focus 输入框聚焦时触发的事件，参数为 event 对象
 * @event {Function} blur 输入框失焦时触发的事件，参数为 event 对象
 */

export default {
    name: 'UniNumberBox',
    emits: ['change', 'input', 'update:modelValue', 'blur', 'focus'],
    props: {
        value: {
            type: [Number, String],
            default: 1
        },
        modelValue: {
            type: [Number, String],
            default: 1
        },
        min: {
            type: Number,
            default: 1
        },
        max: {
            type: Number,
            default: 100
        },
        step: {
            type: Number,
            default: 1
        },
        background: {
            type: String,
            default: '#f5f5f5'
        },
        color: {
            type: String,
            default: '#333'
        },
        disabled: {
            type: Boolean,
            default: false
        }
    },
    data() {
        return {
            inputValue: 0
        }
    },
    watch: {
        value(val) {
            this.inputValue = +val
        },
        modelValue(val) {
            this.inputValue = +val
        }
    },
    created() {
        if (this.value === 1) {
            this.inputValue = +this.modelValue
        }
        if (this.modelValue === 1) {
            this.inputValue = +this.value
        }
    },
    methods: {
        _calcValue(type) {
            if (this.disabled) {
                return
            }
            const scale = this._getDecimalScale()
            let value = this.inputValue * scale
            let step = this.step * scale
            if (type === 'minus') {
                value -= step
                if (value < this.min * scale) {
                    return
                }
                if (value > this.max * scale) {
                    value = this.max * scale
                }
            }

            if (type === 'plus') {
                value += step
                if (value > this.max * scale) {
                    return
                }
                if (value < this.min * scale) {
                    value = this.min * scale
                }
            }

            this.inputValue = (value / scale).toFixed(String(scale).length - 1)
            this.$emit('change', +this.inputValue)
            // TODO vue2 兼容
            this.$emit('input', +this.inputValue)
            // TODO vue3 兼容
            this.$emit('update:modelValue', +this.inputValue)
        },
        _getDecimalScale() {
            let scale = 1
            // 浮点型
            if (~~this.step !== this.step) {
                scale = Math.pow(10, String(this.step).split('.')[1].length)
            }
            return scale
        },
        _onBlur(event) {
            this.$emit('blur', event)
            let value = event.detail.value
            if (!value) {
                // this.inputValue = 0;
                return
            }
            value = +value
            if (value > this.max) {
                value = this.max
            } else if (value < this.min) {
                value = this.min
            }
            const scale = this._getDecimalScale()
            this.inputValue = value.toFixed(String(scale).length - 1)
            this.$emit('change', +this.inputValue)
            this.$emit('input', +this.inputValue)
        },
        _onFocus(event) {
            this.$emit('focus', event)
        }
    }
}
</script>
<style lang="scss" scoped>
$box-height: 48rpx;
$bg: #fff;
$br: 4rpx;
$color: #333;

.cm-number-box {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
}

.cm-number-box-btns {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: 0 16rpx;
    background-color: $bg;
    /* #ifdef H5 */
    cursor: pointer;
    /* #endif */
    border: 1rpx solid #e1e1e1;
}

.cm-number-box__value {
    background-color: $bg;
    width: 48rpx;
    height: $box-height;
    text-align: center;
    font-size: 26rpx;
    border: 2rpx solid #e1e1e1;
    border-left-width: 0;
    border-right-width: 0;
    color: $color;
    background-color: #e1e1e1;
}

.cm-number-box__minus {
    border-top-left-radius: $box-height / 2;
    border-bottom-left-radius: $box-height / 2;
}

.cm-number-box__plus {
    border-top-right-radius: $box-height / 2;
    border-bottom-right-radius: $box-height / 2;
}

.cm-number-box--text {
    // fix nvue
    line-height: 44rpx;

    font-size: 32rpx;
    font-weight: 300;
    color: $color;
}

.cm-number-box .cm-number-box--disabled {
    color: #c0c0c0 !important;
    /* #ifdef H5 */
    cursor: not-allowed;
    /* #endif */
}
</style>