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<script>
import { GlIntersectionObserver, GlSafeHtmlDirective } from '@gitlab/ui';
import ChunkLine from './chunk_line.vue';
/*
* We only highlight the chunk that is currently visible to the user.
* By making use of the Intersection Observer API we can determine when a chunk becomes visible and highlight it accordingly.
*
* Content that is not visible to the user (i.e. not highlighted) do not need to look nice,
* so by making text transparent and rendering raw (non-highlighted) text,
* the browser spends less resources on painting content that is not immediately relevant.
*
* Why use transparent text as opposed to hiding content entirely?
* 1. If content is hidden entirely, native find text (⌘ + F) won't work.
* 2. When URL contains line numbers, the browser needs to be able to jump to the correct line.
*/
export default {
components: {
ChunkLine,
GlIntersectionObserver,
},
directives: {
SafeHtml: GlSafeHtmlDirective,
},
props: {
chunkIndex: {
type: Number,
required: false,
default: 0,
},
isHighlighted: {
type: Boolean,
required: true,
},
content: {
type: String,
required: true,
},
startingFrom: {
type: Number,
required: false,
default: 0,
},
totalLines: {
type: Number,
required: false,
default: 0,
},
language: {
type: String,
required: false,
default: null,
},
blamePath: {
type: String,
required: true,
},
},
computed: {
lines() {
return this.content.split('\n');
},
},
methods: {
handleChunkAppear() {
if (!this.isHighlighted) {
this.$emit('appear', this.chunkIndex);
}
},
},
};
</script>
<template>
<div>
<gl-intersection-observer @appear="handleChunkAppear">
<div v-if="isHighlighted">
<chunk-line
v-for="(line, index) in lines"
:key="index"
:number="startingFrom + index + 1"
:content="line"
:language="language"
:blame-path="blamePath"
/>
</div>
<div v-else class="gl-display-flex">
<div class="gl-display-flex gl-flex-direction-column">
<a
v-for="(n, index) in totalLines"
:id="`L${startingFrom + index + 1}`"
:key="index"
class="gl-ml-5 gl-text-transparent"
:href="`#L${startingFrom + index + 1}`"
:data-line-number="startingFrom + index + 1"
data-testid="line-number"
>
{{ startingFrom + index + 1 }}
</a>
</div>
<div
class="gl-white-space-pre-wrap! gl-text-transparent"
data-testid="content"
v-text="content"
></div>
</div>
</gl-intersection-observer>
</div>
</template>
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