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packages/steps/src/step.vue

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+<template>
+  <div
+    class="el-step"
+    :style="style"
+    :class="[
+      !isSimple && `is-${$parent.direction}`,
+      isSimple && 'is-simple',
+      isLast && !space && !isCenter && 'is-flex',
+      isCenter && !isVertical && !isSimple && 'is-center'
+     ]">
+    <!-- icon & line -->
+    <div
+      class="el-step__head"
+      :class="`is-${currentStatus}`">
+      <div
+        class="el-step__line"
+        :style="isLast ? '' : { marginRight: $parent.stepOffset + 'px' }"
+      >
+        <i class="el-step__line-inner" :style="lineStyle"></i>
+      </div>
+
+      <div class="el-step__icon" :class="`is-${icon ? 'icon' : 'text'}`">
+        <slot
+          v-if="currentStatus !== 'success' && currentStatus !== 'error'"
+          name="icon">
+          <i v-if="icon" class="el-step__icon-inner" :class="[icon]"></i>
+          <div class="el-step__icon-inner" v-if="!icon && !isSimple">{{ index + 1 }}</div>
+        </slot>
+        <i
+          v-else
+          :class="['el-icon-' + (currentStatus === 'success' ? 'check' : 'close')]"
+          class="el-step__icon-inner is-status"
+        >
+        </i>
+      </div>
+    </div>
+    <!-- title & description -->
+    <div class="el-step__main">
+      <div
+        class="el-step__title"
+        ref="title"
+        :class="['is-' + currentStatus]">
+        <slot name="title">{{ title }}</slot>
+      </div>
+      <div v-if="isSimple" class="el-step__arrow"></div>
+      <div
+        v-else
+        class="el-step__description"
+        :class="['is-' + currentStatus]">
+        <slot name="description">{{ description }}</slot>
+      </div>
+    </div>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'ElStep',
+
+  props: {
+    title: String,
+    icon: String,
+    description: String,
+    status: String
+  },
+
+  data() {
+    return {
+      index: -1,
+      lineStyle: {},
+      internalStatus: ''
+    };
+  },
+
+  beforeCreate() {
+    this.$parent.steps.push(this);
+  },
+
+  beforeDestroy() {
+    const steps = this.$parent.steps;
+    const index = steps.indexOf(this);
+    if (index >= 0) {
+      steps.splice(index, 1);
+    }
+  },
+
+  computed: {
+    currentStatus() {
+      return this.status || this.internalStatus;
+    },
+    prevStatus() {
+      const prevStep = this.$parent.steps[this.index - 1];
+      return prevStep ? prevStep.currentStatus : 'wait';
+    },
+    isCenter() {
+      return this.$parent.alignCenter;
+    },
+    isVertical() {
+      return this.$parent.direction === 'vertical';
+    },
+    isSimple() {
+      return this.$parent.simple;
+    },
+    isLast() {
+      const parent = this.$parent;
+      return parent.steps[parent.steps.length - 1] === this;
+    },
+    stepsCount() {
+      return this.$parent.steps.length;
+    },
+    space() {
+      const { isSimple, $parent: { space } } = this;
+      return isSimple ? '' : space ;
+    },
+    style: function() {
+      const style = {};
+      const parent = this.$parent;
+      const len = parent.steps.length;
+
+      const space = (typeof this.space === 'number'
+        ? this.space + 'px'
+        : this.space
+          ? this.space
+          : 100 / (len - (this.isCenter ? 0 : 1)) + '%');
+      style.flexBasis = space;
+      if (this.isVertical) return style;
+      if (this.isLast) {
+        style.maxWidth = 100 / this.stepsCount + '%';
+      } else {
+        style.marginRight = -this.$parent.stepOffset + 'px';
+      }
+
+      return style;
+    }
+  },
+
+  methods: {
+    updateStatus(val) {
+      const prevChild = this.$parent.$children[this.index - 1];
+
+      if (val > this.index) {
+        this.internalStatus = this.$parent.finishStatus;
+      } else if (val === this.index && this.prevStatus !== 'error') {
+        this.internalStatus = this.$parent.processStatus;
+      } else {
+        this.internalStatus = 'wait';
+      }
+
+      if (prevChild) prevChild.calcProgress(this.internalStatus);
+    },
+
+    calcProgress(status) {
+      let step = 100;
+      const style = {};
+
+      style.transitionDelay = 150 * this.index + 'ms';
+      if (status === this.$parent.processStatus) {
+        step = this.currentStatus !== 'error' ? 0 : 0;
+      } else if (status === 'wait') {
+        step = 0;
+        style.transitionDelay = (-150 * this.index) + 'ms';
+      }
+
+      style.borderWidth = step && !this.isSimple ? '1px' : 0;
+      this.$parent.direction === 'vertical'
+        ? style.height = step + '%'
+        : style.width = step + '%';
+
+      this.lineStyle = style;
+    }
+  },
+
+  mounted() {
+    const unwatch = this.$watch('index', val => {
+      this.$watch('$parent.active', this.updateStatus, { immediate: true });
+      this.$watch('$parent.processStatus', () => {
+        const activeIndex = this.$parent.active;
+        this.updateStatus(activeIndex);
+      }, { immediate: true });
+      unwatch();
+    });
+  }
+};
+</script>

packages/steps/src/steps.vue

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+<template>
+  <div
+    class="el-steps"
+    :class="[
+       !simple && 'el-steps--' + direction,
+       simple && 'el-steps--simple'
+     ]">
+      <slot></slot>
+  </div>
+</template>
+
+<script>
+import Migrating from 'element-ui/src/mixins/migrating';
+
+export default {
+  name: 'ElSteps',
+
+  mixins: [Migrating],
+
+  props: {
+    space: [Number, String],
+    active: Number,
+    direction: {
+      type: String,
+      default: 'horizontal'
+    },
+    alignCenter: Boolean,
+    simple: Boolean,
+    finishStatus: {
+      type: String,
+      default: 'finish'
+    },
+    processStatus: {
+      type: String,
+      default: 'process'
+    }
+  },
+
+  data() {
+    return {
+      steps: [],
+      stepOffset: 0
+    };
+  },
+
+  methods: {
+    getMigratingConfig() {
+      return {
+        props: {
+          'center': 'center is removed.'
+        }
+      };
+    }
+  },
+
+  watch: {
+    active(newVal, oldVal) {
+      this.$emit('change', newVal, oldVal);
+    },
+
+    steps(steps) {
+      steps.forEach((child, index) => {
+        child.index = index;
+      });
+    }
+  }
+};
+</script>