CRadioButton.vue

<template>
  <c-input-container v-bind="$attrs" class="c-radio-button">
    <div class="inner" :style="rows">
      <div
        class="option"
        v-for="(option, index) in options"
        :key="index"
        @click="$emit('input', option)"
       >
        <div class="borderline">
          <div :class="isSelected(option)"/>
        </div>
        <p class="label">{{ getLabel(option) }}</p>
      </div>
    </div>
  </c-input-container>
</template>

<script>
import CInputContainer from '../CInputContainer'

/**
 * A radio button component. When an option is selected, it emits an 'input'
 * event with the chosen option.
 */
export default {
  name: 'CRadioButton',
  components: { CInputContainer },

  props: {
    /**
     * Array of strings or objects
     */
    options: {
      type: Array,
      default: () => ([])
    },

    /**
     * If `options` is an array of objects, CRadioButon will use this prop
     * to compare the currently selected item.
     */
    trackBy: {
      type: String,
      default: ''
    },

    /**
     * If `options` is an array of objects, CRadioButton will use this prop
     * to get the label of the option/value to be displayed for the user.
     */
    displayBy: {
      type: String,
      default: ''
    },

    /**
     * Number of columns
     */
    columns: {
      type: Number,
      default: 1
    },

    /**
     * Selected option's value
     */
    value: {
      type: [Object, String, Boolean],
      default: ''
    }
  },
  computed: {
    rows() {
      return 'grid-template-rows: repeat(' + ~~(this.options.length/this.columns) + ', 1fr);'
    },
  },
  methods: {
    isSelected(option) {
      if (this.trackBy && option instanceof Object) {
        return this.value[this.trackBy] === option[this.trackBy]
          ? 'selected'
          : 'unselected'
      }
      return this.value === option
        ? 'selected'
        : 'unselected'
    },

    getLabel(option) {
      if (this.displayBy && option instanceof Object) {
        return option[this.displayBy]
      }
      return option
    }
  }
}
</script>

<style lang="scss">
.c-radio-button > .inner {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  grid-column-gap: 30px;
  grid-row-gap: 15px;
  justify-content: space-around;

  & > .option {
    display: flex;
    flex-flow: row;
    align-items: center;

    & > .borderline {
      display: flex;
      flex-flow: row;
      align-items: center;
      justify-content: center;
      width: 25px;
      height: 25px;
      border: 1px solid $base-border-color;
      border-radius: 50%;
      background-color: white;

      & > .selected {
        width: 15px;
        height: 15px;
        border-radius: 50%;
        background-color: map-get($disabled-color-map, dark);
        transition: width .4s, height .4s;
        transition-timing-function: cubic-bezier(.45,1.8,.5,.75);
      }

      & > .unselected {
        width: 0;
        height: 0;
      }
    }

    & > .label {
      vertical-align: middle;
      margin-left: 10px;
      font-size: 15px;
      color: map-get($disabled-color-map, dark);
    }
  }
}
</style>