import Checkbox from '../checkbox/checkbox.vue' // At widest, approximately 20 emoji are visible in a row, // loading 3 rows, could be overkill for narrow picker const LOAD_EMOJI_BY = 60 // When to start loading new batch emoji, in pixels const LOAD_EMOJI_MARGIN = 64 const filterByKeyword = (list, keyword = '') => { return list.filter(x => x.displayText.includes(keyword)) } const EmojiPicker = { props: { enableStickerPicker: { required: false, type: Boolean, default: false } }, data () { return { keyword: '', activeGroup: 'custom', showingStickers: false, groupsScrolledClass: 'scrolled-top', keepOpen: false, customEmojiBufferSlice: LOAD_EMOJI_BY, customEmojiTimeout: null, customEmojiLoadAllConfirmed: false } }, components: { StickerPicker: () => import('../sticker_picker/sticker_picker.vue'), Checkbox }, methods: { onStickerUploaded (e) { this.$emit('sticker-uploaded', e) }, onStickerUploadFailed (e) { this.$emit('sticker-upload-failed', e) }, onEmoji (emoji) { const value = emoji.imageUrl ? `:${emoji.displayText}:` : emoji.replacement this.$emit('emoji', { insertion: value, keepOpen: this.keepOpen }) }, onScroll (e) { const target = (e && e.target) || this.$refs['emoji-groups'] this.updateScrolledClass(target) this.scrolledGroup(target) this.triggerLoadMore(target) }, highlight (key) { const ref = this.$refs['group-' + key] const top = ref[0].offsetTop this.setShowStickers(false) this.activeGroup = key this.$nextTick(() => { this.$refs['emoji-groups'].scrollTop = top + 1 }) }, updateScrolledClass (target) { if (target.scrollTop <= 5) { this.groupsScrolledClass = 'scrolled-top' } else if (target.scrollTop >= target.scrollTopMax - 5) { this.groupsScrolledClass = 'scrolled-bottom' } else { this.groupsScrolledClass = 'scrolled-middle' } }, triggerLoadMore (target) { const ref = this.$refs['group-end-custom'][0] if (!ref) return const bottom = ref.offsetTop + ref.offsetHeight const scrollerBottom = target.scrollTop + target.clientHeight const scrollerTop = target.scrollTop const scrollerMax = target.scrollHeight // Loads more emoji when they come into view const approachingBottom = bottom - scrollerBottom < LOAD_EMOJI_MARGIN // Always load when at the very top in case there's no scroll space yet const atTop = scrollerTop < 5 // Don't load when looking at unicode category or at the very bottom const bottomAboveViewport = bottom < scrollerTop || scrollerBottom === scrollerMax if (!bottomAboveViewport && (approachingBottom || atTop)) { this.loadEmoji() } }, scrolledGroup (target) { const top = target.scrollTop + 5 this.$nextTick(() => { this.emojisView.forEach(group => { const ref = this.$refs['group-' + group.id] if (ref[0].offsetTop <= top) { this.activeGroup = group.id } }) }) }, loadEmoji () { const allLoaded = this.customEmojiBuffer.length === this.filteredEmoji.length if (allLoaded) { return } this.customEmojiBufferSlice += LOAD_EMOJI_BY }, startEmojiLoad (forceUpdate = false) { if (!forceUpdate) { this.keyword = '' } this.$nextTick(() => { this.$refs['emoji-groups'].scrollTop = 0 }) const bufferSize = this.customEmojiBuffer.length const bufferPrefilledAll = bufferSize === this.filteredEmoji.length if (bufferPrefilledAll && !forceUpdate) { return } this.customEmojiBufferSlice = LOAD_EMOJI_BY }, toggleStickers () { this.showingStickers = !this.showingStickers }, setShowStickers (value) { this.showingStickers = value } }, watch: { keyword () { this.customEmojiLoadAllConfirmed = false this.onScroll() this.startEmojiLoad(true) } }, computed: { activeGroupView () { return this.showingStickers ? '' : this.activeGroup }, stickersAvailable () { if (this.$store.state.instance.stickers) { return this.$store.state.instance.stickers.length > 0 } return 0 }, filteredEmoji () { return filterByKeyword( this.$store.state.instance.customEmoji || [], this.keyword ) }, customEmojiBuffer () { return this.filteredEmoji.slice(0, this.customEmojiBufferSlice) }, emojis () { const standardEmojis = this.$store.state.instance.emoji || [] const customEmojis = this.customEmojiBuffer return [ { id: 'custom', text: this.$t('emoji.custom'), icon: 'icon-smile', emojis: customEmojis }, { id: 'standard', text: this.$t('emoji.unicode'), icon: 'icon-picture', emojis: filterByKeyword(standardEmojis, this.keyword) } ] }, emojisView () { return this.emojis.filter(value => value.emojis.length > 0) }, stickerPickerEnabled () { return (this.$store.state.instance.stickers || []).length !== 0 } } } export default EmojiPicker