AdaptiveDiv

AdaptiveDiv is a regular div that reports it's dimensions to parent component.

Show dimensions

AdaptiveDiv tracks changed dimensions dimensions and reports it in v-model:width, v-model:height and v-model:square.

0x0 = 0

<template>
  <AdaptiveDiv class="adaptive-div red-border" v-model:width="width" v-model:height="height" v-model:square="square">
    {{ width }}x{{ height }} = {{ square }}
    <div class="resize-handler"></div>
  </AdaptiveDiv>
</template>

<style scoped lang="scss">
.adaptive-div {
  width: 300px;
  height: 200px;
  resize: both;
  overflow: auto;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
</style>

<script>
import AdaptiveDiv from '@/AdaptiveDiv.vue';

export default {
  components: { AdaptiveDiv },

  data() {
    return {
      width: 0,
      height: 0,
      square: 0,
    };
  },
}
</script>

Adaptive thumbnail

The main purpose of this component is to create adaptive thumbnails or image viewvers. You can see in browser's developer tools which picture is actualy showed.

<template>
  <AdaptiveDiv class="adaptive-div red-border" v-model:width="width" v-model:height="height" v-model:square="square">
    <img src="/images/300x200.JPG?url" alt="300x200" title="300x200" onload="this.classList.add('loaded')">
    <img src="/images/600x400.JPG?url" alt="600x400" title="600x400" v-if="square > 300 * 200"
      onload="this.classList.add('loaded')">
    <img src="/images/900x600.JPG?url" alt="900x600" title="900x600" v-if="square > 600 * 400"
      onload="this.classList.add('loaded')">
    <img src="/images/1200x800.JPG?url" alt="1200x800" title="1200x800" v-if="square > 900 * 600"
      onload="this.classList.add('loaded')">
    <div class="resize-handler"></div>
  </AdaptiveDiv>
</template>

<style scoped lang="scss">
.adaptive-div {
  width: 300px;
  height: 200px;
  resize: both;
  overflow: auto;
  position: relative;

  img {
    position: absolute;
    width: 100%;
    height: 100%;
    object-fit: cover;

    // Workaround against white background of loading image in FireFox on slow connections
    opacity: 0;

    &.loaded {
      opacity: 1;
    }
  }
}
</style>

<script>
import AdaptiveDiv from '@/AdaptiveDiv.vue';

export default {
  components: { AdaptiveDiv },

  data() {
    return {
      width: 0,
      height: 0,
      square: 0,
    };
  },
}
</script>

AdaptiveDiv inside ImageZoomer

Since ResizeObserver does not relay on CSS translate property, we need the dimensions multiply on the zoom value in parent component.

<template>
  <ImageZoomer ref="zoomer" class="red-border zoomer" v-model:zoom="zoom" transition="all 0.1s ease">
    <AdaptiveDiv class="adaptive-div" v-model:width="width" v-model:height="height" v-model:square="square">
      <img src="/images/300x200.JPG?url" alt="300x200" title="300x200" onload="this.classList.add('loaded')">
      <img src="/images/600x400.JPG?url" alt="600x400" title="600x400" v-if="square * zoom * zoom >= 300 * 200"
        onload="this.classList.add('loaded')">
      <img src="/images/900x600.JPG?url" alt="900x600" title="900x600" v-if="square * zoom * zoom >= 600 * 400"
        onload="this.classList.add('loaded')">
      <img src="/images/DSC08427.JPG?url" alt="1920x1080" title="1920x1080" v-if="square * zoom * zoom >= 900 * 600"
        onload="this.classList.add('loaded')">
    </AdaptiveDiv>
  </ImageZoomer>
</template>

<style scoped lang="scss">
.zoomer {
  width: 100%;
  height: 400px;

  .adaptive-div {
    width: 100%;
    height: 100%;
    position: relative;

    img {
      position: absolute;
      width: 100%;
      height: 100%;
      object-fit: cover;

      // Workaround against white background of loading image in FireFox on slow connections
      opacity: 0;

      &.loaded {
        opacity: 1;
      }
    }
  }
}
</style>

<script>
import ImageZoomer from '@/ImageZoomer.vue';
import AdaptiveDiv from '@/AdaptiveDiv.vue';

export default {
  components: { ImageZoomer, AdaptiveDiv },

  data() {
    return {
      zoom: 1,
      width: 0,
      height: 0,
      square: 0,
    };
  },
}
</script>

API

Models

width: Width of element
height: Height of element
square: widh * height

Note: These values are read-only.

Slots

default