Improve emoji picker performance (#275)
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Details
A simple virtual scroller is now used for the emoji grid. This avoids loading all emoji images at once, saving network bandwidth and reducing load on the server, while also putting less work on the browser's DOM and layout engine. Co-authored-by: yan <yan@omg.lol> Reviewed-on: #275 Co-authored-by: yanchan09 <yan@omg.lol> Co-committed-by: yanchan09 <yan@omg.lol>pull/279/head
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@ -0,0 +1,133 @@
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const EMOJI_SIZE = 32 + 8
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const GROUP_TITLE_HEIGHT = 24
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const BUFFER_SIZE = 3 * EMOJI_SIZE
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const EmojiGrid = {
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props: {
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groups: {
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required: true,
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type: Array
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}
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},
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data () {
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return {
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containerWidth: 0,
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containerHeight: 0,
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scrollPos: 0,
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resizeObserver: null
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}
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},
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mounted () {
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const rect = this.$refs.container.getBoundingClientRect()
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this.containerWidth = rect.width
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this.containerHeight = rect.height
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this.resizeObserver = new ResizeObserver((entries) => {
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for (const entry of entries) {
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this.containerWidth = entry.contentRect.width
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this.containerHeight = entry.contentRect.height
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}
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})
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this.resizeObserver.observe(this.$refs.container)
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},
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beforeUnmount () {
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this.resizeObserver.disconnect()
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this.resizeObserver = null
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},
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watch: {
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groups () {
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// Scroll to top when grid content changes
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if (this.$refs.container) {
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this.$refs.container.scrollTo(0, 0)
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}
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},
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activeGroup (group) {
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this.$emit('activeGroup', group)
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}
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},
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methods: {
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onScroll () {
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this.scrollPos = this.$refs.container.scrollTop
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},
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onEmoji (emoji) {
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this.$emit('emoji', emoji)
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},
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scrollToItem (itemId) {
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const container = this.$refs.container
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if (!container) return
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for (const item of this.itemList) {
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if (item.id === itemId) {
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container.scrollTo(0, item.position.y)
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return
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}
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}
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}
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},
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computed: {
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// Total height of scroller content
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gridHeight () {
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if (this.itemList.length === 0) return 0
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const lastItem = this.itemList[this.itemList.length - 1]
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return (
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lastItem.position.y +
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('title' in lastItem ? GROUP_TITLE_HEIGHT : EMOJI_SIZE)
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)
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},
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activeGroup () {
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const items = this.itemList
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for (let i = items.length - 1; i >= 0; i--) {
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const item = items[i]
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if ('title' in item && item.position.y <= this.scrollPos) {
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return item.id
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}
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}
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return null
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},
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itemList () {
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const items = []
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let x = 0
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let y = 0
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for (const group of this.groups) {
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items.push({ position: { x, y }, id: group.id, title: group.text })
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if (group.text.length) {
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y += GROUP_TITLE_HEIGHT
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}
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for (const emoji of group.emojis) {
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items.push({
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position: { x, y },
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id: `${group.id}-${emoji.displayText}`,
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emoji
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})
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x += EMOJI_SIZE
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if (x + EMOJI_SIZE > this.containerWidth) {
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y += EMOJI_SIZE
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x = 0
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}
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}
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if (x > 0) {
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y += EMOJI_SIZE
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x = 0
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}
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}
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return items
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},
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visibleItems () {
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const startPos = this.scrollPos - BUFFER_SIZE
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const endPos = this.scrollPos + this.containerHeight + BUFFER_SIZE
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return this.itemList.filter((i) => {
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return i.position.y >= startPos && i.position.y < endPos
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})
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},
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scrolledClass () {
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if (this.scrollPos <= 5) {
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return 'scrolled-top'
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} else if (this.scrollPos >= this.gridHeight - this.containerHeight - 5) {
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return 'scrolled-bottom'
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} else {
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return 'scrolled-middle'
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}
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}
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}
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}
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export default EmojiGrid
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@ -0,0 +1,60 @@
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.emoji {
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&-grid {
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flex: 1 1 1px;
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position: relative;
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overflow: auto;
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user-select: none;
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mask: linear-gradient(to top, white 0, transparent 100%) bottom no-repeat,
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linear-gradient(to bottom, white 0, transparent 100%) top no-repeat,
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linear-gradient(to top, white, white);
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transition: mask-size 150ms;
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mask-size: 100% 20px, 100% 20px, auto;
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// Autoprefixed seem to ignore this one, and also syntax is different
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-webkit-mask-composite: xor;
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mask-composite: exclude;
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&.scrolled {
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&-top {
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mask-size: 100% 20px, 100% 0, auto;
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}
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&-bottom {
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mask-size: 100% 0, 100% 20px, auto;
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}
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}
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margin-left: 5px;
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min-height: 200px;
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}
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&-group-title {
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position: absolute;
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font-size: 0.85em;
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width: 100%;
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margin: 0;
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height: 24px;
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display: flex;
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align-items: end;
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&.disabled {
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display: none;
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}
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}
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&-item {
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position: absolute;
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width: 32px;
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height: 32px;
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box-sizing: border-box;
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display: flex;
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font-size: 32px;
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align-items: center;
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justify-content: center;
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margin: 4px;
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cursor: pointer;
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img {
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object-fit: contain;
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max-width: 100%;
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max-height: 100%;
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}
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}
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}
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@ -0,0 +1,48 @@
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<template>
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<div
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ref="container"
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class="emoji-grid"
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:class="scrolledClass"
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@scroll.passive="onScroll"
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>
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<div
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:style="{
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height: `${gridHeight}px`,
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}"
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>
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<template v-for="item in visibleItems">
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<h6
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v-if="'title' in item && item.title.length"
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:key="'title-' + item.id"
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class="emoji-group-title"
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:style="{
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top: item.position.y + 'px',
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left: item.position.x + 'px'
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}"
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>
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{{ item.title }}
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</h6>
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<span
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v-else-if="'emoji' in item"
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:key="'emoji-' + item.id"
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class="emoji-item"
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:title="item.emoji.displayText"
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:style="{
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top: item.position.y + 'px',
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left: item.position.x + 'px'
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}"
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@click.stop.prevent="onEmoji(item.emoji)"
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>
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<span v-if="!item.emoji.imageUrl">{{ item.emoji.replacement }}</span>
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<img
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v-else
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:src="item.emoji.imageUrl"
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>
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</span>
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</template>
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</div>
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</div>
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</template>
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<script src="./emoji_grid.js"></script>
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<style lang="scss" src="./emoji_grid.scss"></style>
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