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<script>
export default {
inject: ['vscrollParent'],
props: {
maxLength: {
type: Number,
required: true,
},
},
data() {
return {
nextIndex: -1,
nextItem: null,
startedRender: false,
width: 0,
};
},
mounted() {
this.width = this.$el.parentNode.offsetWidth;
this.$_itemsWithSizeWatcher = this.$watch('vscrollParent.itemsWithSize', async () => {
await this.$nextTick();
const nextItem = this.findNextToRender();
if (nextItem) {
this.startedRender = true;
requestIdleCallback(() => {
this.nextItem = nextItem;
if (this.nextIndex === this.maxLength - 1) {
this.$nextTick(() => {
if (this.vscrollParent.itemsWithSize[this.maxLength - 1].size !== 0) {
this.clearRendering();
}
});
}
});
} else if (this.startedRender) {
this.clearRendering();
}
});
},
beforeDestroy() {
this.$_itemsWithSizeWatcher();
},
methods: {
clearRendering() {
this.nextItem = null;
if (this.maxLength === this.vscrollParent.itemsWithSize.length) {
this.$_itemsWithSizeWatcher();
}
},
findNextToRender() {
return this.vscrollParent.itemsWithSize.find(({ size }, index) => {
const isNext = size === 0;
if (isNext) {
this.nextIndex = index;
}
return isNext;
});
},
},
};
</script>
<template>
<div v-if="nextItem" :style="{ width: `${width}px` }" class="gl-absolute diff-file-offscreen">
<slot
v-bind="{ item: nextItem.item, index: nextIndex, active: true, itemWithSize: nextItem }"
></slot>
</div>
</template>
<style scoped>
.diff-file-offscreen {
top: -200%;
left: -200%;
}
</style>
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