Merge pull request #125 from Gargron/fix-useless-rerenders

Remove function binds in render wherever possible, use PureComponent

src/components/anchors.js

@@ -3,7 +3,7 @@ import PropTypes from 'prop-types'
 
 import SVGs from '../svgs'
 
-export default class Anchors extends React.Component {
+export default class Anchors extends React.PureComponent {
   constructor(props) {
     super(props)
 
@@ -14,6 +14,15 @@ export default class Anchors extends React.Component {
     this.state = {
       selected: defaultCategory.name
     }
+
+    this.handleClick = this.handleClick.bind(this)
+  }
+
+  handleClick (e) {
+    var index = e.currentTarget.getAttribute('data-index')
+    var { categories, onAnchorClick } = this.props
+
+    onAnchorClick(categories[index], index)
   }
 
   render() {
@@ -33,7 +42,8 @@ export default class Anchors extends React.Component {
           <span
             key={name}
             title={i18n.categories[name.toLowerCase()]}
-            onClick={() => onAnchorClick(category, i)}
+            data-index={i}
+            onClick={this.handleClick}
             className={`emoji-mart-anchor ${isSelected ? 'emoji-mart-anchor-selected' : ''}`}
             style={{ color: isSelected ? color : null }}
           >

src/components/category.js

@@ -5,6 +5,13 @@ import frequently from '../utils/frequently'
 import { Emoji } from '.'
 
 export default class Category extends React.Component {
+  constructor(props) {
+    super(props)
+
+    this.setContainerRef = this.setContainerRef.bind(this)
+    this.setLabelRef = this.setLabelRef.bind(this)
+  }
+
   componentDidMount() {
     this.parent = this.container.parentNode
 
@@ -133,16 +140,13 @@ export default class Category extends React.Component {
       }
     }
 
-    return <div ref={this.setContainerRef.bind(this)} className={`emoji-mart-category ${emojis && !emojis.length ? 'emoji-mart-no-results' : ''}`} style={containerStyles}>
+    return <div ref={this.setContainerRef} className={`emoji-mart-category ${emojis && !emojis.length ? 'emoji-mart-no-results' : ''}`} style={containerStyles}>
       <div style={labelStyles} data-name={name} className='emoji-mart-category-label'>
-        <span style={labelSpanStyles} ref={this.setLabelRef.bind(this)}>{i18n.categories[name.toLowerCase()]}</span>
+        <span style={labelSpanStyles} ref={this.setLabelRef}>{i18n.categories[name.toLowerCase()]}</span>
       </div>
 
       {emojis && emojis.map((emoji) =>
-        Emoji({
-          emoji: emoji,
-          ...emojiProps
-        })
+        Emoji({ emoji: emoji, ...emojiProps })
       )}
 
       {emojis && !emojis.length &&

src/components/picker.js

@@ -32,7 +32,7 @@ const I18N = {
   },
 }
 
-export default class Picker extends React.Component {
+export default class Picker extends React.PureComponent {
   constructor(props) {
     super(props)
 
@@ -115,6 +115,19 @@ export default class Picker extends React.Component {
     }
 
     this.categories.unshift(SEARCH_CATEGORY)
+
+    this.setAnchorsRef     = this.setAnchorsRef.bind(this)
+    this.handleAnchorClick = this.handleAnchorClick.bind(this)
+    this.setSearchRef      = this.setSearchRef.bind(this)
+    this.handleSearch      = this.handleSearch.bind(this)
+    this.setScrollRef      = this.setScrollRef.bind(this)
+    this.handleScroll      = this.handleScroll.bind(this)
+    this.handleScrollPaint = this.handleScrollPaint.bind(this)
+    this.handleEmojiOver   = this.handleEmojiOver.bind(this)
+    this.handleEmojiLeave  = this.handleEmojiLeave.bind(this)
+    this.handleEmojiClick  = this.handleEmojiClick.bind(this)
+    this.setPreviewRef     = this.setPreviewRef.bind(this)
+    this.handleSkinChange  = this.handleSkinChange.bind(this)
   }
 
   componentWillReceiveProps(props) {
@@ -206,7 +219,7 @@ export default class Picker extends React.Component {
   handleScroll() {
     if (!this.waitingForPaint) {
       this.waitingForPaint = true
-      window.requestAnimationFrame(this.handleScrollPaint.bind(this))
+      window.requestAnimationFrame(this.handleScrollPaint)
     }
   }
 
@@ -368,17 +381,17 @@ export default class Picker extends React.Component {
     return <div style={{width: width, ...style}} className='emoji-mart'>
       <div className='emoji-mart-bar'>
         <Anchors
-          ref={this.setAnchorsRef.bind(this)}
+          ref={this.setAnchorsRef}
           i18n={this.i18n}
           color={color}
           categories={this.categories}
-          onAnchorClick={this.handleAnchorClick.bind(this)}
+          onAnchorClick={this.handleAnchorClick}
         />
       </div>
 
       <Search
-        ref={this.setSearchRef.bind(this)}
-        onSearch={this.handleSearch.bind(this)}
+        ref={this.setSearchRef}
+        onSearch={this.handleSearch}
         i18n={this.i18n}
         emojisToShowFilter={emojisToShowFilter}
         include={include}
@@ -387,7 +400,7 @@ export default class Picker extends React.Component {
         autoFocus={autoFocus}
       />
 
-      <div ref={this.setScrollRef.bind(this)} className='emoji-mart-scroll' onScroll={this.handleScroll.bind(this)}>
+      <div ref={this.setScrollRef} className='emoji-mart-scroll' onScroll={this.handleScroll}>
         {this.getCategories().map((category, i) => {
           return <Category
             ref={this.setCategoryRef.bind(this, `category-${i}`)}
@@ -407,9 +420,9 @@ export default class Picker extends React.Component {
               sheetSize: sheetSize,
               forceSize: native,
               backgroundImageFn: backgroundImageFn,
-              onOver: this.handleEmojiOver.bind(this),
-              onLeave: this.handleEmojiLeave.bind(this),
-              onClick: this.handleEmojiClick.bind(this),
+              onOver: this.handleEmojiOver,
+              onLeave: this.handleEmojiLeave,
+              onClick: this.handleEmojiClick,
             }}
           />
         })}
@@ -417,7 +430,7 @@ export default class Picker extends React.Component {
 
       {showPreview && <div className='emoji-mart-bar'>
         <Preview
-          ref={this.setPreviewRef.bind(this)}
+          ref={this.setPreviewRef}
           title={title}
           emoji={emoji}
           emojiProps={{
@@ -430,7 +443,7 @@ export default class Picker extends React.Component {
           }}
           skinsProps={{
             skin: skin,
-            onChange: this.handleSkinChange.bind(this)
+            onChange: this.handleSkinChange
           }}
         />
       </div>}

src/components/preview.js

@@ -4,7 +4,7 @@ import PropTypes from 'prop-types'
 import { Emoji, Skins } from '.'
 import { getData } from '../utils'
 
-export default class Preview extends React.Component {
+export default class Preview extends React.PureComponent {
   constructor(props) {
     super(props)
     this.state = { emoji: null }
@@ -31,11 +31,7 @@ export default class Preview extends React.Component {
 
       return <div className='emoji-mart-preview'>
         <div className='emoji-mart-preview-emoji'>
-          {Emoji({
-            key: emoji.id,
-            emoji: emoji,
-            ...emojiProps,
-          })}
+          {Emoji({ key: emoji.id, emoji: emoji, ...emojiProps })}
         </div>
 
         <div className='emoji-mart-preview-data'>
@@ -55,10 +51,7 @@ export default class Preview extends React.Component {
     } else {
       return <div className='emoji-mart-preview'>
         <div className='emoji-mart-preview-emoji'>
-          {idleEmoji && idleEmoji.length && Emoji({
-            emoji: idleEmoji,
-            ...emojiProps,
-          })}
+          {idleEmoji && idleEmoji.length && Emoji({ emoji: idleEmoji, ...emojiProps })}
         </div>
 
         <div className='emoji-mart-preview-data'>

src/components/search.js

@@ -2,7 +2,14 @@ import React from 'react'
 import PropTypes from 'prop-types'
 import emojiIndex from '../utils/emoji-index'
 
-export default class Search extends React.Component {
+export default class Search extends React.PureComponent {
+  constructor (props) {
+    super(props)
+
+    this.setRef = this.setRef.bind(this)
+    this.handleChange = this.handleChange.bind(this)
+  }
+
   handleChange() {
     var value = this.input.value
 
@@ -28,9 +35,9 @@ export default class Search extends React.Component {
 
     return <div className='emoji-mart-search'>
       <input
-        ref={this.setRef.bind(this)}
+        ref={this.setRef}
         type='text'
-        onChange={this.handleChange.bind(this)}
+        onChange={this.handleChange}
         placeholder={i18n.search}
         autoFocus={autoFocus}
       />

src/components/skins.js

@@ -1,16 +1,19 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 
-export default class Skins extends React.Component {
+export default class Skins extends React.PureComponent {
   constructor(props) {
     super(props)
 
     this.state = {
       opened: false,
     }
+
+    this.handleClick = this.handleClick.bind(this)
   }
 
-  handleClick(skin) {
+  handleClick(e) {
+    var skin = e.currentTarget.getAttribute('data-skin')
     var { onChange } = this.props
 
     if (!this.state.opened) {
@@ -39,9 +42,9 @@ export default class Skins extends React.Component {
           className={`emoji-mart-skin-swatch ${selected ? 'emoji-mart-skin-swatch-selected' : ''}`}
         >
           <span
-            onClick={() => this.handleClick(skinTone)}
-            className={`emoji-mart-skin emoji-mart-skin-tone-${skinTone}`}>
-          </span>
+            onClick={this.handleClick}
+            data-skin={skinTone}
+            className={`emoji-mart-skin emoji-mart-skin-tone-${skinTone}`} />
         </span>
       )
     }