Add categories anchors

css/emoji-picker.css

@@ -21,6 +21,47 @@
   border-bottom-right-radius: 5px;
 }
 
+.emoji-picker-anchors {
+  display: flex;
+  justify-content: space-between;
+  padding: 0 6px;
+  color: #858585;
+}
+
+.emoji-picker-anchor {
+  position: relative;
+  flex: 1;
+  text-align: center;
+  padding: 12px 4px;
+  overflow: hidden;
+  transition: color .2s ease-out;
+}
+
+.emoji-picker-anchor-selected {
+  color: #ae65c5;
+}
+.emoji-picker-anchor-selected .emoji-picker-anchor-bar {
+  bottom: 0;
+}
+
+.emoji-picker-anchor-bar {
+  position: absolute;
+  bottom: -3px; left: 0;
+  width: 100%; height: 3px;
+  background-color: #ae65c5;
+  transition: bottom .2s ease-out;
+}
+
+.emoji-picker-anchors i {
+  display: inline-block;
+  width: 100%;
+  max-width: 22px;
+}
+
+.emoji-picker-anchors svg {
+  fill: currentColor;
+}
+
 .emoji-picker-scroll {
   overflow: scroll;
   height: 270px;

example/index.js

@@ -54,7 +54,7 @@ class Example extends React.Component {
 <br />
 <br /><Operator>&lt;</Operator><Variable>Picker</Variable>
 <br />  emojiSize<Operator>=</Operator>&#123;<Variable>{this.state.emojiSize}</Variable>&#125; <input type='range' data-key='emojiSize' onChange={this.handleInput.bind(this)} min='16' max='64' value={this.state.emojiSize} />
-<br />  perLine<Operator>=</Operator>&#123;<Variable>{this.state.perLine}</Variable>&#125; {this.state.perLine < 10 ? '  ' : ' '} <input type='range' data-key='perLine' onChange={this.handleInput.bind(this)} min='5' max='16' value={this.state.perLine} />
+<br />  perLine<Operator>=</Operator>&#123;<Variable>{this.state.perLine}</Variable>&#125; {this.state.perLine < 10 ? '  ' : ' '} <input type='range' data-key='perLine' onChange={this.handleInput.bind(this)} min='6' max='16' value={this.state.perLine} />
 <br />  skin<Operator>=</Operator>&#123;<Variable>{this.state.skin}</Variable>&#125;       <input type='range' data-key='skin' onChange={this.handleInput.bind(this)} min='1' max='6' value={this.state.skin} />
 <br />  sheetURL<Operator>=</Operator><String>'images/sheet-{this.state.set}-64.png'</String>
 <br />  onClick<Operator>=</Operator>&#123;(<Variable>emoji</Variable>) => console.log(<Variable>emoji</Variable>)&#125;

example/webpack.config.js

@@ -18,6 +18,13 @@ module.exports = {
           path.resolve('example'),
         ],
       },
+      {
+        test: /\.svg$/,
+        loader: 'svg-inline',
+        include: [
+          path.resolve('src/svgs'),
+        ],
+      },
     ],
   },
 

package.json

@@ -34,6 +34,8 @@
     "react": "0.14.7",
     "react-dom": "0.14.7",
     "rimraf": "2.5.2",
+    "svg-inline-loader": "0.4.1",
+    "svg-inline-react": "1.0.1",
     "webpack": "1.12.14"
   },
   "scripts": {

src/components/anchors.js

@@ -0,0 +1,58 @@
+import React from 'react'
+import InlineSVG from 'svg-inline-react'
+
+import Activity from '../svgs/activity.svg'
+import Flags from '../svgs/flags.svg'
+import Foods from '../svgs/foods.svg'
+import Nature from '../svgs/nature.svg'
+import Objects from '../svgs/objects.svg'
+import People from '../svgs/people.svg'
+import Places from '../svgs/places.svg'
+import Recent from '../svgs/recent.svg'
+import Symbols from '../svgs/symbols.svg'
+
+var svgs = {
+  Activity,
+  Flags,
+  Foods,
+  Nature,
+  Objects,
+  People,
+  Places,
+  Recent,
+  Symbols,
+}
+
+export default class Anchors extends React.Component {
+  constructor(props) {
+    super(props)
+
+    this.state = {
+      selected: props.categories[0].name
+    }
+  }
+
+  render() {
+    var { categories } = this.props,
+        { selected } = this.state
+
+    return <div className='emoji-picker-anchors'>
+      {categories.map((category, i) => {
+        var { name } = category
+
+        return <span key={name} className={`emoji-picker-anchor ${name == selected ? 'emoji-picker-anchor-selected' : ''}`}>
+          <InlineSVG src={svgs[name]} />
+          <span className='emoji-picker-anchor-bar'></span>
+        </span>
+      })}
+    </div>
+  }
+}
+
+Anchors.propTypes = {
+  categories: React.PropTypes.array,
+}
+
+Anchors.defaultProps = {
+  categories: [],
+}

src/components/category.js

@@ -23,7 +23,11 @@ export default class Category extends React.Component {
     var { height: labelHeight } = this.label.getBoundingClientRect()
 
     this.top = top - parentTop + this.parent.scrollTop
-    this.maxMargin = height - labelHeight
+    if (height > labelHeight) {
+      this.maxMargin = height - labelHeight
+    } else {
+      this.maxMargin = 1
+    }
   }
 
   handleScroll(scrollTop) {
@@ -32,15 +36,22 @@ export default class Category extends React.Component {
     margin = margin > this.maxMargin ? this.maxMargin : margin
 
     if (margin == this.margin) return
-    this.label.style.top = `${margin}px`
+    var { name } = this.props
+
+    if (!this.props.hasStickyPosition) {
+      this.label.style.top = `${margin}px`
+    }
+
     this.margin = margin
+    return true
   }
 
   render() {
     var { name, emojis, hasStickyPosition, emojiProps } = this.props,
-        emojis = emojis.slice(0),
+        emojis = emojis ? emojis.slice(0) : null,
         labelStyles = {},
-        labelSpanStyles = {}
+        labelSpanStyles = {},
+        containerStyles = {}
 
     if (!hasStickyPosition) {
       labelStyles = {
@@ -52,12 +63,19 @@ export default class Category extends React.Component {
       }
     }
 
-    return <div ref='container' className='emoji-picker-category'>
+    if (!emojis) {
+      containerStyles = {
+        height: 1,
+        overflow: 'hidden',
+      }
+    }
+
+    return <div ref='container' className='emoji-picker-category' style={containerStyles}>
       <div style={labelStyles} data-name={name} className='emoji-picker-category-label'>
         <span style={labelSpanStyles} ref='label'>{name}</span>
       </div>
 
-      {emojis.map((emoji) =>
+      {emojis && emojis.map((emoji) =>
         <Emoji
           key={emoji}
           emoji={emoji}
@@ -65,7 +83,7 @@ export default class Category extends React.Component {
         />
       )}
 
-      {!emojis.length &&
+      {emojis && !emojis.length &&
         <div className='emoji-picker-no-results'>
           <Emoji
             {...emojiProps}

src/components/picker.js

@@ -1,9 +1,16 @@
+import '../utils/raf-polyfill'
+
 import React from 'react'
 
 import data from '../../data'
 import Preview from './preview'
 import Category from './category'
 import Search from './search'
+import Anchors from './anchors'
+
+const DEFAULT_CATEGORIES = [
+  { name: 'Recent', emojis: null }
+].concat(data.categories)
 
 export default class Picker extends React.Component {
   constructor(props) {
@@ -11,7 +18,7 @@ export default class Picker extends React.Component {
     this.testStickyPosition()
 
     this.state = {
-      categories: data.categories,
+      categories: DEFAULT_CATEGORIES,
     }
   }
 
@@ -42,22 +49,46 @@ export default class Picker extends React.Component {
   }
 
   handleScroll() {
-    var target = this.refs.scroll,
-        scrollTop = target.scrollTop
-
-    if (!this.hasStickyPosition) {
-      Array(this.state.categories.length).fill().forEach((_, i) => {
-        var category = this.refs[`category-${i}`]
-        if (category) {
-          category.handleScroll(scrollTop)
-        }
-      })
+    if (!this.waitingForPaint) {
+      this.waitingForPaint = true
+      window.requestAnimationFrame(this.handleScrollPaint.bind(this))
     }
   }
 
+  handleScrollPaint() {
+    this.waitingForPaint = false
+
+    var target = this.refs.scroll,
+        scrollTop = target.scrollTop,
+        activeCategory = null
+
+    for (let i = 0, l = this.state.categories.length; i < l; i++) {
+      let category = this.state.categories[i],
+          component = this.refs[`category-${i}`]
+
+      if (component) {
+        let active = component.handleScroll(scrollTop)
+        if (active && !activeCategory) {
+          activeCategory = category
+        }
+      }
+    }
+
+    if (activeCategory) {
+      let { anchors } = this.refs,
+          { name: categoryName } = activeCategory
+
+      if (anchors.state.selected != categoryName) {
+        anchors.setState({ selected: categoryName })
+      }
+    }
+
+    this.scrollTop = scrollTop
+  }
+
   handleSearch(emojis) {
     if (emojis == null) {
-      this.setState({ categories: data.categories })
+      this.setState({ categories: DEFAULT_CATEGORIES })
     } else {
       this.setState({ categories: [{
         name: 'Search Results',
@@ -72,7 +103,10 @@ export default class Picker extends React.Component {
 
     return <div style={{width: width}} className='emoji-picker'>
       <div className='emoji-picker-bar'>
-        Categories
+        <Anchors
+          ref='anchors'
+          categories={DEFAULT_CATEGORIES}
+        />
       </div>
 
       <div ref="scroll" className='emoji-picker-scroll' onScroll={this.handleScroll.bind(this)}>

src/utils/raf-polyfill.js

@@ -0,0 +1,31 @@
+// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
+// http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
+
+// requestAnimationFrame polyfill by Erik Möller. fixes from Paul Irish and Tino Zijdel
+
+// MIT license
+
+(function() {
+    var lastTime = 0;
+    var vendors = ['ms', 'moz', 'webkit', 'o'];
+    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
+        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
+        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame']
+                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
+    }
+
+    if (!window.requestAnimationFrame)
+        window.requestAnimationFrame = function(callback, element) {
+            var currTime = new Date().getTime();
+            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
+            var id = window.setTimeout(function() { callback(currTime + timeToCall); },
+              timeToCall);
+            lastTime = currTime + timeToCall;
+            return id;
+        };
+
+    if (!window.cancelAnimationFrame)
+        window.cancelAnimationFrame = function(id) {
+            clearTimeout(id);
+        };
+}());

src/webpack.config.js

@@ -23,6 +23,13 @@ module.exports = {
           path.resolve('data'),
         ],
       },
+      {
+        test: /\.svg$/,
+        loader: 'svg-inline',
+        include: [
+          path.resolve('src/svgs'),
+        ],
+      },
     ],
   },