chenhaodong / mew-iview

  <template>

      <div
          :class="[prefixCls + '-saturation-wrapper']"
          tabindex="0"
          @keydown.esc="handleEscape"
          @click="$el.focus()"
          @keydown.left="handleLeft"
          @keydown.right="handleRight"
          @keydown.up="handleUp"
          @keydown.down="handleDown"
      >

          <div

              ref="container"

              :style="bgColorStyle"
              :class="[prefixCls + '-saturation']"

              @mousedown="handleMouseDown">

              <div :class="[prefixCls + '-saturation--white']"></div>
              <div :class="[prefixCls + '-saturation--black']"></div>
              <div
                  :style="pointerStyle"
                  :class="[prefixCls + '-saturation-pointer']">
                  <div :class="[prefixCls + '-saturation-circle']"></div>

              </div>
          </div>
      </div>
  </template>

  <script>

  import HSAMixin from './hsaMixin';
  import Prefixes from './prefixMixin';
  import {clamp, getIncrement} from './utils';
  
  export default {
      name: 'Saturation',
  
      mixins: [HSAMixin, Prefixes],
  
      data() {
          const normalStep = 0.01;
  
          return {
              left: -normalStep,
              right: normalStep,
              up: normalStep,
              down: -normalStep,
              multiplier: 10,
              powerKey: 'shiftKey',
          };
      },
  
      computed: {
          bgColorStyle() {
              return {background: `hsl(${this.value.hsv.h}, 100%, 50%)`};
          },
          pointerStyle() {
              return {top: `${-(this.value.hsv.v * 100) + 1 + 100}%`, left: `${this.value.hsv.s * 100}%`};
          },
      },
  
      methods: {
          change(h, s, v, a) {
              this.$emit('change', {h, s, v, a, source: 'hsva'});
          },
          handleSlide(e, direction, key) {
              e.preventDefault();
              e.stopPropagation();
  
              const isPowerKey = e[this.powerKey];
              const increment = isPowerKey ? direction * this.multiplier : direction;
              const {h, s, v, a} = this.value.hsv;
              const saturation = clamp(s + getIncrement(key, ['left', 'right'], increment), 0, 1);
              const bright = clamp(v + getIncrement(key, ['up', 'down'], increment), 0, 1);
  
              this.change(h, saturation, bright, a);
          },
          handleChange(e) {
              e.preventDefault();
              e.stopPropagation();
  
              const {clientWidth, clientHeight} = this.$refs.container;
              const left = clamp(this.getLeft(e), 0, clientWidth);
              const top = clamp(this.getTop(e), 0, clientHeight);
              const saturation = left / clientWidth;
              const bright = clamp(1 - top / clientHeight, 0, 1);

              this.change(this.value.hsv.h, saturation, bright, this.value.hsv.a);

          },

          handleMouseDown(e) {
              HSAMixin.methods.handleMouseDown.call(this, e);
              window.addEventListener('mouseup', this.handleChange, false);

          },

          unbindEventListeners(e) {
              HSAMixin.methods.unbindEventListeners.call(this, e);
              window.removeEventListener('mouseup', this.handleChange);

          },

      },
  };
  </script>