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<template>
<div ref="waterfall" class="waterfall">
<WaterfallItem
v-for="item in items"
:key="item.id"
:style="{ width: `${itemWidth}px`, marginBottom: `${gutterHeight}px` }"
:width="itemWidth">
<slot :item="item" />
</WaterfallItem>
</div>
</template>
<script>
import WaterfallItem from './WaterfallItem.vue';
const isBrowser = typeof window !== 'undefined';
// eslint-disable-next-line global-require
const Masonry = isBrowser ? window.Masonry || require('masonry-layout') : null;
const imagesloaded = isBrowser ? require('imagesloaded') : null;
export default {
name: 'Waterfall',
components: {
WaterfallItem,
},
props: {
options: {
type: Object,
default: () => {},
},
items: {
type: Array,
default: () => [],
},
itemWidth: {
type: Number,
default: 150,
},
gutterWidth: {
type: Number,
default: 10,
},
gutterHeight: {
type: Number,
default: 4,
},
},
mounted() {
this.initializeMasonry();
this.imagesLoaded();
},
updated() {
this.performLayout();
this.imagesLoaded();
},
unmounted() {
this.masonry.destroy();
},
methods: {
imagesLoaded() {
const node = this.$refs.waterfall;
imagesloaded(
node,
() => {
this.masonry.layout();
},
);
},
performLayout() {
const diff = this.diffDomChildren();
if (diff.removed.length > 0) {
this.masonry.remove(diff.removed);
this.masonry.reloadItems();
}
if (diff.appended.length > 0) {
this.masonry.appended(diff.appended);
this.masonry.reloadItems();
}
if (diff.prepended.length > 0) {
this.masonry.prepended(diff.prepended);
}
if (diff.moved.length > 0) {
this.masonry.reloadItems();
}
this.masonry.layout();
},
diffDomChildren() {
const oldChildren = this.domChildren.filter((element) => !!element.parentNode);
const newChildren = this.getNewDomChildren();
const removed = oldChildren.filter((oldChild) => !newChildren.includes(oldChild));
const domDiff = newChildren.filter((newChild) => !oldChildren.includes(newChild));
const prepended = domDiff.filter((newChild, index) => newChildren[index] === newChild);
const appended = domDiff.filter((el) => !prepended.includes(el));
let moved = [];
if (removed.length === 0) {
moved = oldChildren.filter((child, index) => index !== newChildren.indexOf(child));
}
this.domChildren = newChildren;
return {
old: oldChildren,
new: newChildren,
removed,
appended,
prepended,
moved,
};
},
initializeMasonry() {
if (!this.masonry) {
this.masonry = new Masonry(
this.$refs.waterfall,
{
columnWidth: this.itemWidth,
gutter: this.gutterWidth,
...this.options,
},
);
this.domChildren = this.getNewDomChildren();
}
},
getNewDomChildren() {
const node = this.$refs.waterfall;
const children = this.options && this.options.itemSelector
? node.querySelectorAll(this.options.itemSelector) : node.children;
return Array.prototype.slice.call(children);
},
},
};
</script>
<style lang="scss" scoped>
.wfi {
}
</style>
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