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HTML

              
                <!--
  Nothing here, the app will render on the Body.

  Sorry.
-->
              
            
!

CSS

              
                @use postcss-cssnext;
@use postcss-nested;

:root {
  /* color palette :: https://coolors.co/app/d63c6b-5cc8ff-efefef-292f36-d6d6d6 */
  --white: #efefef;
  --white-alpha: rgba(239, 239, 239, .64);
  --grey: #d6d6d6;
  --gray: var(--grey);
  --black: #292f36;
  --pure-black: #131313;
  --pure-black-alpha: rgba(19, 19, 19, .64);
  --pure-black-alpha-light: rgba(19, 19, 19, .24);
  --pure-black-alpha-transparent: rgba(19, 19, 19, .12);
  
  --primary: #d63c6b;
  --primary-dk: #c41c4f;
  --accent: #5cc8ff;
  --accent-dk: #00a3f5;
  
  --transition: 300ms;
  --easing: cubic-bezier(1, 1, 1, 1);
  --easing-bounce-in: cubic-bezier(0, 0, .43, 1.3);
  --easing-bounce-out: cubic-bezier(.43, 1.3, 0, 0);
  font-size: 100%;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

*,
*:before,
*:after {
  box-sizing: border-box;
}

html,
body {
  position: relative;
  
  width: 100%;
  height: 100%;
  background-image: linear-gradient(to bottom right, var(--accent) 0%, var(--primary) 100%);
  background-repeat: no-repeat;
  background-attachment: fixed;
}

body {
  padding-top: 20px;
  user-select: none;
}

button {
  outline: none;
  border: 0;
  padding: 1rem;
  background-color: var(--black);
  
  font-size: 1.25rem;
  line-height: 1;
  color: var(--accent);

  transition: all var(--transition) var(--easing);
  
  &:hover {
    color: var(--accent-dk);
  }
  
  &.block {
    width: 100%;
  }
  
  &.transparent {
    background-color: transparent;
  }
  
  &.no-padding {
    padding: 0;
  }
  &.long-text { font-size: 1rem; }
}

.react-calculator {
  position: relative;
  margin: 0 auto;
  width: 320px;
  
  box-shadow: 0 19px 38px var(--pure-black-alpha-light),
    0 15px 12px var(--pure-black-alpha-transparent);
}

body,
.editable-field, 
.memory-bank {
  &::-webkit-scrollbar { width: .5rem; }
  &::-webkit-scrollbar:horizontal { height: .5rem; }
  
  &::-webkit-scrollbar-track,
  &::-webkit-scrollbar:horizontal {
    background-color: var(--pure-black);
  }
  
  &::-webkit-scrollbar-thumb,
  &::-webkit-scrollbar:horizontal {
    background-color: var(--primary);
  }
  s
  &:hover {
    &::-webkit-scrollbar-thumb,
    &::-webkit-scrollbar:horizontal {
      background-color: var(--primary-dk);
    } 
  }
}

.editable-field {
  position: relative;
  width: 320px;
  height: 80px;
  z-index: 10;
  
  outline: none;
  box-shadow: 0 4px 2px -2px var(--pure-black-alpha);
  padding: .5rem;
  overflow-y: hidden;
  overflow-x: scroll;
  
  background-color: var(--pure-black-alpha);

  font-size: 2rem;
  line-height: 2;
  color: var(--primary);
  text-align: right;
  direction: rtl;
  white-space: nowrap;
}

.memory-bank {
  position: absolute;
  top: 80px;
  left: 0;
  z-index: 10;
  
  width: 100%;
  height: 0;
  overflow: hidden;
  padding: 0;
  
  background-color: var(--pure-black-alpha);
  color: var(--accent-dk);
  
  transition: height 150ms var(--easing),
    overflow 1ms var(--easing) 200ms,
    padding 1ms var(--easing) 200ms;
  
  .toggle-close {
    position: absolute;
    top: 5px;
    right: 5px;
    padding: 2px 5px;
    
    .title {
      display: inline-block;
      transform: rotate(45deg);
    }
  }
  
  &.visible {
    height: calc(100% - 80px);
    padding: 10px;
    overflow-y: auto;
    
    transition: height 200ms var(--easing),
      padding 1ms var(--easing);
  }
}

.button-set {
  &--functions,
  &--equations {
    background-color: var(--black);
    
    button {
      display: inline-block;
      width: 80px;
      height: 80px;
      
      vertical-align: top;
      text-transform: uppercase;
      font-variant: small-caps;
      color: var(--primary);
      
      &:hover {
        color: var(--primary-dk);
      }
    }
  }

  &--numbers {
    width: 240px;
    float: left;
    background-color: var(--black);
    button {
      display: block;
      position: relative;
      
      width: 80px;
      height: 80px;
      float: left;
      
      background-color: var(--black);
      
      transition: box-shadow var(--transition) var(--easing);
      
      &:last-child {        
        width: 100%;
      }
    }
  }
  

  &--functions {
    clear: left;
    float: left;
    width: 240px;
  }
 
}
              
            
!

JS

              
                const ee = new EventEmitter();
const App = React.createClass({  
  render() {    
    return (
      <main className="react-calculator">
        <InputField />
        <TotalRecall />
        <ButtonSetNumbers />
        <ButtonSetFunctions />
        <ButtonSetEquations />      
      </main>
    )
  }
});
const Button = React.createClass({
  _handleClick() {
    let text = this.props.text,
        cb = this.props.clickHandler;
    
    if (cb) {
      cb.call(null, text);
    }
  },
  
  render() {
    return (
      <button className={this.props.klass} onClick={this._handleClick}>
        <span className="title">{this.props.text}</span>
      </button>
    );
  }
});
const ContentEditable = React.createClass({
  _handleClick() {
    const cb = this.props.clickHandler;

    if (cb) {
      cb.call(this);
    }
  },
  
  render() {
    return (
      <div className="editable-field" contentEditable={this.props.initEdit} spellcheck={this.props.spellCheck} onClick={this._handleClick}>
        {this.props.text}
      </div>
    )
  }
});

const InputField = React.createClass({
  _updateField(newStr) {
    newStr = newStr.split ? newStr.split(' ').reverse().join(' ') : newStr;
    return this.setState({text: newStr});
  },
  
  getInitialState() {
    this.props.text = this.props.text || '0';
    
    return {text: this.props.text};
  },
  
  componentWillMount() {
    ee.addListener('numberCruncher', this._updateField);
  },
  
  render() {    
    return <ContentEditable text={this.state.text} initEdit="false" spellcheck="false" clickHandler={this._clickBait} />
  }
});
const TotalRecall = React.createClass({
  _toggleMemories() {
    this.setState({show: !this.state.show});
  },
  
  _recallMemory(memory) {
    store.newInput = memory;
    ee.emitEvent('toggle-memories');
  },
  
  getInitialState() {
    return {show: false}
  },
  
  componentWillMount() {
    ee.addListener('toggle-memories', this._toggleMemories);
  },
  
  render() {
    let classNames = `memory-bank ${this.state.show ? 'visible' : ''}`;
    
    return (
      <section className={classNames}>
        <Button text="+" clickHandler={this._toggleMemories} klass="toggle-close" />
        {store.curMemories.map((mem) => {
          return (
            <Button klass="block memory transparent" text={mem} clickHandler={this._recallMemory} />
          );
        })}
      </section>
    )
  }
});
const ButtonSetFunctions = React.createClass({
  _showMemoryBank() {
    ee.emitEvent('toggle-memories');
  },
  
  _clear() {
    store.newInput = 0;
  },
  
  _contentClear() {
    let curInput = String(store.curInput),
        lessOne = curInput.substring(0, (curInput.length - 1));
    
    return store.newInput = lessOne === '' ? 0 : lessOne;
  },
  
  render() {
    return (
      <section className="button-set--functions">
        <Button klass="long-text" text="recall" clickHandler={this._showMemoryBank} />
        <Button klass="long-text" text="clear" clickHandler={this._clear} />
        <Button text="&larr;" clickHandler={this._contentClear} />
      </section>
    )
  }
});
const ButtonSetEquations = React.createClass({
  _eq(type) {
    store.newInput = `${store.curInput} ${type} `;
  },
  
  _equate() {
    store.newInput = eval(store.curInput);
  },
  
  render() {
    return (
      <section className="button-set--equations">
        <Button text="+" clickHandler={this._eq} />
        <Button text="-" clickHandler={this._eq} />
        <Button text="*" clickHandler={this._eq} />
        <Button text="/" clickHandler={this._eq} />
        <Button text="=" clickHandler={this._equate} />
      </section>
    )  
  }
});
const ButtonSetNumbers = React.createClass({
  _number(num) {
    if (!store.curInput) {
      return store.newInput = num;
    }
    
    return store.newInput = `${store.curInput}${num}`;
  },
  
  render() {
    return (
      <section className="button-set--numbers">
        <Button text="1" clickHandler={this._number} />
        <Button text="2" clickHandler={this._number} />
        <Button text="3" clickHandler={this._number} />
        <Button text="4" clickHandler={this._number} />
        <Button text="5" clickHandler={this._number} />
        <Button text="6" clickHandler={this._number} />
        <Button text="7" clickHandler={this._number} />
        <Button text="8" clickHandler={this._number} />
        <Button text="9" clickHandler={this._number} />
        <Button text="0" clickHandler={this._number} />
      </section>
    )
  }
});

let store = {
  input: 0,
  memory: [],
  get curInput() {
    return this.input;
  },
  
  get curMemories() {
    return this.memory.filter((m) => m !== undefined);
  },
  
  set commitMemory(input) {
    this.memory.push(input);
  },
  
  set newInput(str) {    
    let curInput = str,
      oldInput = this.curInput;
    
    if (this.curMemories.indexOf(oldInput) === -1) {
      this.commitMemory = oldInput;
    }
    
    this.input = curInput;
    ee.emitEvent('numberCruncher', [this.curInput]);
  }
};

React.render(
  <App />,
  document.querySelector('body')
);




              
            
!
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