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<span class="cdx-thumbnail">
<span
v-if="!thumbnailLoaded"
class="cdx-thumbnail__placeholder"
>
<cdx-icon
:icon="placeholderIcon"
class="cdx-thumbnail__placeholder__icon--vue"
/>
</span>
<Transition name="cdx-thumbnail__image">
<span
v-if="thumbnailLoaded"
:style="thumbnailStyle"
:class="NoInvertClass"
class="cdx-thumbnail__image"
/>
</Transition>
</span>
</template>
<script lang="ts">
import { PropType, defineComponent, ref, onMounted } from 'vue';
import { cdxIconImageLayoutFrameless, Icon } from '@wikimedia/codex-icons';
import CdxIcon from '../icon/Icon.vue';
import { Thumbnail } from '../../types';
import { NoInvertClass } from '../../constants';
/**
* A small preview of an image.
*
* The placeholder icon will display until thumbnail image loads, or if a thumbnail image is not
* provided.
*/
export default defineComponent( {
name: 'CdxThumbnail',
components: { CdxIcon },
props: {
/**
* Thumbnail data.
*/
thumbnail: {
type: [ Object, null ] as PropType<Thumbnail|null>,
default: null
},
/**
* Thumbnail placeholder icon.
*/
placeholderIcon: {
type: [ String, Object ] as PropType<Icon>,
default: cdxIconImageLayoutFrameless
}
},
setup: ( props ) => {
const thumbnailLoaded = ref( false );
const thumbnailStyle = ref( {} );
const preloadThumbnail = ( url: string ) => {
const escapedUrl = url.replace( /([\\"\n])/g, '\\$1' );
const image = new Image();
image.onload = () => {
thumbnailStyle.value = { backgroundImage: `url("${ escapedUrl }")` };
thumbnailLoaded.value = true;
};
image.onerror = () => {
thumbnailLoaded.value = false;
};
image.src = escapedUrl;
};
onMounted( () => {
if ( props.thumbnail?.url ) {
preloadThumbnail( props.thumbnail.url );
}
} );
return {
thumbnailStyle,
thumbnailLoaded,
NoInvertClass
};
}
} );
</script>
<style lang="less">
@import ( reference ) '@wikimedia/codex-design-tokens/theme-wikimedia-ui.less';
@import ( reference ) '../../themes/mixins/public/css-icon.less';
.cdx-thumbnail {
// `flex` prevents a descender from being added below the image; `inline` limits width of this
// element to the width of the image.
display: inline-flex;
&__placeholder,
&__image {
background-position: @background-position-base;
background-repeat: no-repeat;
background-size: @background-size-search-figure;
// Thumbnail should never shrink when it's in a flex layout with other elements.
flex-shrink: 0;
box-sizing: @box-sizing-base;
// Values of thumbnail as declared within the MenuItem component, f.e. in TypeaheadSearch.
min-width: @min-size-search-figure;
min-height: @min-size-search-figure;
width: @size-search-figure;
height: @size-search-figure;
border: @border-subtle;
border-radius: @border-radius-base;
}
&__image {
display: inline-block;
// Fade in transition applied to the thumbnail on show.
&-enter-active {
transition-property: @transition-property-fade;
transition-duration: @transition-duration-base;
}
&-enter-from {
opacity: @opacity-transparent;
}
}
&__placeholder {
background-color: @background-color-interactive-subtle;
display: inline-flex;
align-items: center;
justify-content: center;
&__icon {
.cdx-mixin-css-icon( @cdx-icon-image-layout-frameless, @color-placeholder );
&--vue.cdx-icon {
color: @color-placeholder;
}
}
}
}
</style>
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