enfrancais-app/src/components/nodes/NodeView.vue

<template>
  <article
    class="node-view"
    :class="['node-view-' + mode, 'node-view-' + type, 'node-view-' + nodeVariant, { 'preview': preview }]"
    :style="`--scroll-top: ${scrollValue}px; --h-height: ${h}px;`"
  >
    <div v-if="!loading" class="node-view-wrapper" :id="`node-${mode}-${node.id}`">
      <component
        ref="header"
        :is="'node-view-header-' + (nodeType === 'prod' && (node.preTitle || node.italTitle) ? 'ref' : nodeType)"
        v-bind="{ node, mode, showOrigin }"
        class="node-view-header"
        :class="{ scrolling: scrollValue }"
        :first-char="firstChar"
      />

      <node-view-body v-bind="{ node, type: nodeType, mode }" :class="{ scrolling: scrollValue }"/>

      <node-view-footer
        v-bind="{ node, mode, type: nodeType, preview, showOrigin }"
        class="node-view-footer"
      />
    </div>

    <node-view-child-list-group
      v-if="!loading && preview && node.children && node.children.length"
      :children="node.children" :id="node.id"
    />

    <b-overlay
      :show="loading"
      :spinner-variant="nodeVariant === 'depart' ? 'dark' : 'light'"
      no-wrap
    />

  </article>
</template>

<script>
import {
  NodeViewChildListGroup,
  NodeViewHeaderRef,
  NodeViewHeaderProd,
  NodeViewBody,
  NodeViewFooter
} from '@/components/nodes'


export default {
  name: 'NodeView',

  components: {
    NodeViewChildListGroup,
    NodeViewHeaderRef,
    NodeViewHeaderProd,
    NodeViewFooter,
    NodeViewBody
  },

  props: {
    node: { type: Object, default: undefined },
    variant: { type: String, default: 'dark' },
    type: { type: String, default: 'ref' },
    forceType: { type: String, default: null },
    mode: { type: String, default: 'view' },
    preview: { type: Boolean, default: false },
    showOrigin: { type: Boolean, default: false },
    firstChar: { type: [String, null], default: null }
  },

  data () {
    return {
      scrollValue: 0,
      h: 0
    }
  },

  computed: {
    loading () {
      const dataLevel = this.mode === 'view' ? 2 : 1
      return this.node === undefined || this.node.dataLevel < dataLevel
    },

    nodeVariant () {
      return this.node !== undefined ? this.node.variant : this.variant
    },

    nodeType () {
      if (this.forceType) return this.forceType
      return this.node !== undefined ? this.node.type : this.type
    }
  },

  methods: {
    onScroll ({ target = this.$el }, fix = false) {
      const prev = this.scrollValue
      this.scrollValue = target.scrollTop

      if (this.scrollValue && !prev) {
        const h = this.$refs.header.$el.getBoundingClientRect().height
        this.$nextTick(() => {
          this.h = h - this.$refs.header.$el.getBoundingClientRect().height
        })
      }

      if (fix) {
        setTimeout(() => {
          if (this.scrollValue > 0 && target.scrollTop === 0) {
            target.scrollTop = this.scrollValue
          }
        }, 50)
      }
    }
  },

  mounted () {
    this.scrolling = this.$el.scrollTop !== 0
    this.$el.addEventListener('scroll', this.onScroll)
  },

  beforeDestroy () {
    this.$el.removeEventListener('scroll', this.onScroll)
  }
}
</script>

<style lang="scss">
.node-view {
  position: relative;

  &-wrapper {
    display: flex;
    flex-direction: column;
  }


  // ╭─╴╭─┐┌─╮┌─╮
  // │  ├─┤├┬╯│ │
  // ╰─╴╵ ╵╵ ╰└─╯

  &-card {
    width: 100%;

    .node-view-wrapper {
      pointer-events: none;
      width: 100%;
      height: 100%;
      overflow: hidden;
    }

    &.node-view-depart {
      box-shadow: .5rem .5rem 1rem rgba($black, .25);

      .node-view-child-list-group {
        box-shadow: .5rem .5rem 1rem rgba($black, .25);
      }
    }
  }

  &-card &-header {
    padding: $node-card-spacer-sm-y $node-card-spacer-sm-x 0;

    @include media-breakpoint-up($size-bp) {
      padding: $node-card-spacer-y $node-card-spacer-x 0;
    }
  }

  &-card &-footer {
    padding: $node-card-spacer-sm-y $node-card-spacer-sm-x $node-card-spacer-sm-y * 2;
    position: sticky;
    bottom: 0;

    @include media-breakpoint-up($size-bp) {
      padding: $node-card-spacer-y $node-card-spacer-x $node-card-spacer-y * 2;
    }
  }


  // ╷ ╷╶┬╴┌─╴╷╷╷
  // │╭╯ │ ├─╴│││
  // ╰╯ ╶┴╴╰─╴╰╯╯

  &-view {
    width: 100%;

    @include media-breakpoint-up($layout-bp) {
      height: 100%;
      overflow-y: auto;

      .node-view-wrapper {
        min-height: 100%;
      }
    }
  }

  &-view &-header {
    padding: $node-view-spacer-sm-y $node-view-spacer-sm-x 0;

    @include media-breakpoint-up($size-bp) {
      padding: $node-view-spacer-y $node-view-spacer-x $node-view-spacer-y * .75;

      h4 {
        margin-bottom: 0;
      }
    }

    @include media-breakpoint-up($layout-bp) {
      position: sticky;
      top: 0;
      z-index: 1;

      &-ref.scrolling {
        h4 {
          font-size: 1.2rem;
        }

        .edition {
          font-size: 0.8rem;
        }

        .btn-url {
          width: 20px;
          height: 20px;
        }
      }
    }
  }

  &-view &-body {
    @include media-breakpoint-up($layout-bp) {
      max-height: 100%;

      &.scrolling {
        clip-path: inset(var(--scroll-top) 0px 0px 0px);

        &.node-view-body-ref {
          padding-top: var(--h-height);
        }
      }
    }
  }

  &-view &-footer {
    padding: $node-view-spacer-sm-y $node-view-spacer-sm-x;

    @include media-breakpoint-up($size-bp) {
      padding: $node-view-spacer-y $node-view-spacer-x;
    }

    @include media-breakpoint-up($layout-bp) {
      position: sticky;
      bottom: 0;
    }
  }

  @each $color, $value in $theme-colors {
    &-#{$color} {
      background-color: lighten($value, 3.25%);

      .node-view-header,
      .node-view-footer {
        background-color: lighten($value, 3.25%);
      }
    }
  }
}
</style>