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WikiLambda Vue component for Visual Editor Wikifunctions function call
insertion and edit plugin.
@copyright 2020– Abstract Wikipedia team; see AUTHORS.txt
@license MIT
-->
<template>
<div class="ext-wikilambda-app-expandable-description">
<span
ref="descriptionComponent"
class="ext-wikilambda-app-expandable-description__text"
:class="{ 'ext-wikilambda-app-expandable-description__text--expanded': isExpanded }"
:lang="description.langCode"
:dir="description.langDir"
>
{{ description.label }}
</span>
<button
v-if="isExpandable"
type="button"
class="ext-wikilambda-app-expandable-description__toggle-button"
@click.stop="toggleExpanded"
>
{{ isExpanded ?
i18n( 'wikilambda-visualeditor-wikifunctionscall-dialog-read-less-description' ) :
i18n( 'wikilambda-visualeditor-wikifunctionscall-dialog-read-more-description' ) }}
</button>
</div>
</template>
<script>
const { defineComponent, inject, onBeforeUnmount, onMounted, ref, watch } = require( 'vue' );
const { throttle } = require( '../../utils/miscUtils.js' );
const LabelData = require( '../../store/classes/LabelData.js' );
module.exports = exports = defineComponent( {
name: 'wl-expandable-description',
props: {
description: {
type: LabelData,
required: true
}
},
setup( props ) {
const i18n = inject( 'i18n' );
// State
const isExpanded = ref( false );
const isExpandable = ref( false );
const descriptionComponent = ref( null );
let throttledResizeHandler = null;
// Expansion actions
/**
* Checks if the description is clamped and updates `isExpandable`.
*/
function checkClamped() {
const element = descriptionComponent.value;
isExpandable.value = element && element.scrollHeight > element.clientHeight;
}
/**
* Toggles the expanded state of the description.
*/
function toggleExpanded() {
isExpanded.value = !isExpanded.value;
}
// Watch
/**
* Re-checks clamping when the description changes.
* This is needed because on mounted the scrollHeight and clientHeight might be 0
*/
watch( () => props.description, () => {
checkClamped();
} );
// Lifecycle
/**
* Sets up resize handling and checks clamping on mount.
*/
onMounted( () => {
// Use a small delay to ensure the DOM is fully rendered
setTimeout( () => {
checkClamped();
}, 10 );
throttledResizeHandler = throttle( checkClamped, 200 );
window.addEventListener( 'resize', throttledResizeHandler );
} );
/**
* Cleans up resize handling before unmounting.
*/
onBeforeUnmount( () => {
window.removeEventListener( 'resize', throttledResizeHandler );
} );
return {
descriptionComponent,
isExpandable,
isExpanded,
toggleExpanded,
i18n
};
}
} );
</script>
<style lang="less">
@import 'mediawiki.skin.variables.less';
.ext-wikilambda-app-expandable-description {
position: relative;
&__toggle-button {
.cdx-mixin-link();
background: var( --background-color-base );
border: 0;
padding: 0;
position: absolute;
right: 0;
bottom: 0;
line-height: var( --line-height-current );
font-size: inherit;
&::before {
content: '';
position: absolute;
top: 0;
left: -80px;
width: 80px;
height: 100%;
background: linear-gradient( to right, transparent, var( --background-color-base ) );
}
}
&__text {
margin: 0;
padding: 0;
overflow: hidden;
-webkit-box-orient: vertical;
-webkit-line-clamp: 2;
line-clamp: 2;
display: -webkit-box;
line-height: var( --line-height-current );
&--expanded {
-webkit-line-clamp: unset;
line-clamp: unset;
display: block;
& + .ext-wikilambda-app-expandable-description__toggle-button {
display: flex;
margin-left: auto;
position: initial;
}
}
}
}
</style>
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