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<script>
import { GlTab } from '@gitlab/ui';
/**
* Wrapper of <gl-tab> to optionally lazily render this tab's content
* when its shown **without dismounting after its hidden**.
*
* Usage:
*
* API is the same as <gl-tab>, for example:
*
* <gl-tabs>
* <editor-tab title="Tab 1" :lazy="true">
* lazily mounted content (gets mounted if this is first tab)
* </editor-tab>
* <editor-tab title="Tab 2" :lazy="true">
* lazily mounted content
* </editor-tab>
* <editor-tab title="Tab 3">
* eagerly mounted content
* </editor-tab>
* </gl-tabs>
*
* Once the tab is selected it is permanently set as "not-lazy"
* so it's contents are not dismounted.
*
* lazy is "false" by default, as in <gl-tab>.
*/
export default {
components: {
GlTab,
// Use a small renderless component to know when the tab content mounts because:
// - gl-tab always gets mounted, even if lazy is `true`. See:
// https://github.com/bootstrap-vue/bootstrap-vue/blob/dev/src/components/tabs/tab.js#L180
// - we cannot listen to events on <slot />
MountSpy: {
render: () => null,
},
},
inheritAttrs: false,
props: {
lazy: {
type: Boolean,
required: false,
default: false,
},
},
data() {
return {
isLazy: this.lazy,
};
},
methods: {
onContentMounted() {
// When a child is first mounted make the entire tab
// permanently mounted by setting 'lazy' to false.
this.isLazy = false;
},
},
};
</script>
<template>
<gl-tab :lazy="isLazy" v-bind="$attrs" v-on="$listeners">
<slot v-for="slot in Object.keys($slots)" :slot="slot" :name="slot"></slot>
<mount-spy @hook:mounted="onContentMounted" />
</gl-tab>
</template>
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