Quantity: rename to Stepper

packages/stepper/index.vue

@@ -0,0 +1,115 @@
+<template>
+  <div class="van-stepper" :class="{ 'van-stepper--disabled': disabled }">
+    <button
+      @click="handleChange('minus')"
+      class="van-stepper__stepper van-stepper__minus"
+      :class="{
+        'van-stepper__minus--disabled': isMinusDisabled
+      }">
+    </button>
+    <input
+      type="text"
+      class="van-stepper__input"
+      :value="currentValue"
+      @input="handleInputChange"
+      :disabled="disabled">
+    <button
+      @click="handleChange('plus')"
+      class="van-stepper__stepper van-stepper__plus"
+      :class="{
+        'van-stepper__plus--disabled': isPlusDisabled
+      }">
+    </button>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'van-stepper',
+
+  props: {
+    min: {
+      type: [String, Number],
+      default: 1
+    },
+    max: {
+      type: [String, Number],
+      default: Infinity
+    },
+    value: {},
+    step: {
+      type: [String, Number],
+      default: 1
+    },
+    disabled: Boolean,
+    defaultValue: {
+      type: [String, Number],
+      default: 1
+    }
+  },
+
+  data() {
+    let value = this.value ? +this.value : +this.defaultValue;
+    const correctedValue = this.correctValue(value);
+    if (value !== correctedValue) {
+      value = correctedValue;
+      this.$emit('input', value);
+    }
+    return {
+      currentValue: value
+    };
+  },
+
+  computed: {
+    isMinusDisabled() {
+      const min = +this.min;
+      const step = +this.step;
+      const currentValue = +this.currentValue;
+      return min === currentValue || (currentValue - step) < min || this.disabled;
+    },
+    isPlusDisabled() {
+      const max = +this.max;
+      const step = +this.step;
+      const currentValue = +this.currentValue;
+      return max === currentValue || (currentValue + step) > max || this.disabled;
+    }
+  },
+
+  watch: {
+    currentValue(val) {
+      this.$emit('input', val);
+      this.$emit('change', val);
+    },
+    value(val) {
+      val = this.correctValue(+val);
+      if (val !== this.currentValue) {
+        this.currentValue = val;
+      }
+    }
+  },
+
+  methods: {
+    // 纠正value值
+    correctValue(value) {
+      value = Math.max(this.min, value);
+      value = Math.min(this.max, value);
+      return value;
+    },
+    handleInputChange(event) {
+      const val = +event.target.value;
+
+      this.currentValue = this.correctValue(val);
+    },
+    handleChange(type) {
+      if ((this.isMinusDisabled && type === 'minus') || (this.isPlusDisabled && type === 'plus')) {
+        this.$emit('overlimit', type);
+        return;
+      }
+
+      const step = +this.step;
+      const currentValue = +this.currentValue;
+      this.currentValue = type === 'minus' ? (currentValue - step) : (currentValue + step);
+    }
+  }
+};
+</script>