first

packages/carousel/src/item.vue

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+<template>
+  <div
+    v-show="ready"
+    class="el-carousel__item"
+    :class="{
+      'is-active': active,
+      'el-carousel__item--card': $parent.type === 'card',
+      'is-in-stage': inStage,
+      'is-hover': hover,
+      'is-animating': animating
+    }"
+    @click="handleItemClick"
+    :style="itemStyle">
+    <div
+      v-if="$parent.type === 'card'"
+      v-show="!active"
+      class="el-carousel__mask">
+    </div>
+    <slot></slot>
+  </div>
+</template>
+
+<script>
+  import { autoprefixer } from 'element-ui/src/utils/util';
+  const CARD_SCALE = 0.83;
+  export default {
+    name: 'ElCarouselItem',
+
+    props: {
+      name: String,
+      label: {
+        type: [String, Number],
+        default: ''
+      }
+    },
+
+    data() {
+      return {
+        hover: false,
+        translate: 0,
+        scale: 1,
+        active: false,
+        ready: false,
+        inStage: false,
+        animating: false
+      };
+    },
+
+    methods: {
+      processIndex(index, activeIndex, length) {
+        if (activeIndex === 0 && index === length - 1) {
+          return -1;
+        } else if (activeIndex === length - 1 && index === 0) {
+          return length;
+        } else if (index < activeIndex - 1 && activeIndex - index >= length / 2) {
+          return length + 1;
+        } else if (index > activeIndex + 1 && index - activeIndex >= length / 2) {
+          return -2;
+        }
+        return index;
+      },
+
+      calcCardTranslate(index, activeIndex) {
+        const parentWidth = this.$parent.$el.offsetWidth;
+        if (this.inStage) {
+          return parentWidth * ((2 - CARD_SCALE) * (index - activeIndex) + 1) / 4;
+        } else if (index < activeIndex) {
+          return -(1 + CARD_SCALE) * parentWidth / 4;
+        } else {
+          return (3 + CARD_SCALE) * parentWidth / 4;
+        }
+      },
+
+      calcTranslate(index, activeIndex, isVertical) {
+        const distance = this.$parent.$el[isVertical ? 'offsetHeight' : 'offsetWidth'];
+        return distance * (index - activeIndex);
+      },
+
+      translateItem(index, activeIndex, oldIndex) {
+        const parentType = this.$parent.type;
+        const parentDirection = this.parentDirection;
+        const length = this.$parent.items.length;
+        if (parentType !== 'card' && oldIndex !== undefined) {
+          this.animating = index === activeIndex || index === oldIndex;
+        }
+        if (index !== activeIndex && length > 2 && this.$parent.loop) {
+          index = this.processIndex(index, activeIndex, length);
+        }
+        if (parentType === 'card') {
+          if (parentDirection === 'vertical') {
+            console.warn('[Element Warn][Carousel]vertical direction is not supported in card mode');
+          }
+          this.inStage = Math.round(Math.abs(index - activeIndex)) <= 1;
+          this.active = index === activeIndex;
+          this.translate = this.calcCardTranslate(index, activeIndex);
+          this.scale = this.active ? 1 : CARD_SCALE;
+        } else {
+          this.active = index === activeIndex;
+          const isVertical = parentDirection === 'vertical';
+          this.translate = this.calcTranslate(index, activeIndex, isVertical);
+        }
+        this.ready = true;
+      },
+
+      handleItemClick() {
+        const parent = this.$parent;
+        if (parent && parent.type === 'card') {
+          const index = parent.items.indexOf(this);
+          parent.setActiveItem(index);
+        }
+      }
+    },
+
+    computed: {
+      parentDirection() {
+        return this.$parent.direction;
+      },
+
+      itemStyle() {
+        const translateType = this.parentDirection === 'vertical' ? 'translateY' : 'translateX';
+        const value = `${translateType}(${ this.translate }px) scale(${ this.scale })`;
+        const style = {
+          transform: value
+        };
+        return autoprefixer(style);
+      }
+    },
+
+    created() {
+      this.$parent && this.$parent.updateItems();
+    },
+
+    destroyed() {
+      this.$parent && this.$parent.updateItems();
+    }
+  };
+</script>