chenhaodong / mew-iview

  <template>
      <div :class="classes" @mouseleave="handleMouseleave">

          <div
              v-for="item in count"
              :class="starCls(item)"
              @mousemove="handleMousemove(item, $event)"
              @click="handleClick(item)">
              <span :class="[prefixCls + '-star-content']" type="half"></span>

          </div>
      </div>
  </template>
  <script>
      const prefixCls = 'ivu-rate';
  
      export default {
          props: {
              count: {
                  type: Number,
                  default: 5
              },
              value: {
                  type: Number,
                  default: 0
              },
              allowHalf: {
                  type: Boolean,
                  default: false
              },
              disabled: {
                  type: Boolean,
                  default: false
              }
          },
          data () {
              return {
                  prefixCls: prefixCls,

                  hoverIndex: -1,
                  isHover: false,
                  isHalf: false

              };
          },
          computed: {
              classes () {
                  return [
                      `${prefixCls}`,
                      {
                          [`${prefixCls}-disabled`]: this.disabled
                      }

                  ];

              }
          },

          watch: {
              value: {
                  immediate: true,
                  handler (val) {
                      this.setHalf(val);
                  }
              }
          },

          methods: {
              starCls (value) {
                  const hoverIndex = this.hoverIndex;

                  const currentIndex = this.isHover ? hoverIndex : this.value;
  

                  let full = false;

                  let isLast = false;
  
                  if (currentIndex > value) full = true;

                  if (this.isHover) {
                      isLast = currentIndex === value + 1;
                  } else {
                      isLast = Math.ceil(this.value) === value + 1;

                  }
  
                  return [
                      `${prefixCls}-star`,
                      {

                          [`${prefixCls}-star-full`]: (!isLast && full) || (isLast && !this.isHalf),
                          [`${prefixCls}-star-half`]: isLast && this.isHalf,

                          [`${prefixCls}-star-zero`]: !full
                      }

                  ];

              },

              handleMousemove(value, event) {

                  if (this.disabled) return;
  

                  this.isHover = true;

                  if (this.allowHalf) {

                      const type = event.target.getAttribute('type') || false;
                      this.isHalf = type === 'half';

                  } else {

                      this.isHalf = false;

                  }

                  this.hoverIndex = value + 1;

              },
              handleMouseleave () {

                  if (this.disabled) return;
  
                  this.isHover = false;
                  this.setHalf(this.value);

                  this.hoverIndex = -1;
              },

              setHalf (val) {
                  this.isHalf = val.toString().indexOf('.') >= 0;
              },
              handleClick (value) {
                  if (this.disabled) return;
                  value++;
                  if (this.isHalf) value -= 0.5;
                  this.value = value;
                  this.$emit('on-change', value);
                  this.$dispatch('on-form-change', value);

              }
          }
      };
  </script>