add basics and component source code

Author: wfbn8821

.gitignore

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+node_modules
+.idea

LICENSE.md

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+
+
+The MIT License (MIT)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

package.json

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+{
+  "name": "react-card-scroll",
+  "version": "0.1.0",
+  "description": "A React component to navigate horizontally between cards of same width",
+  "main": "src/index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "react-component",
+    "navigation",
+    "scroll",
+    "horizontal",
+    "cards"
+  ],
+  "author": "Florian Bernard",
+  "license": "MIT",
+  "devDependencies": {
+    "react": "^15.0.1",
+    "webpack": "^1.13.0"
+  },
+  "dependencies": {
+    "lodash": "^4.11.1",
+    "react-motion": "^0.4.2"
+  }
+}

src/index.js

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+import React from 'react';
+import {throttle} from 'lodash'
+import {Motion, spring} from 'react-motion'
+
+let CardScroll = React.createClass({
+    getInitialState(){
+        return {currentLeft: 0, currentCard: 0}
+    },
+
+    componentDidMount() {
+        window.addEventListener('resize', throttle(() => this.scrollCards({number: 0})));
+    },
+
+    render() {
+        const {currentLeft} = this.state
+        const updateRow = c => {
+            if (c) {
+                this._row = c
+            }
+        }
+        return (
+            <div className="scroll-container flex-item">
+                <div style={{position: "fixed", left: 0, top: "50%", zIndex: 1}}
+                     onClick={this.scrollCardsWrap({toLeft: true})}>{"<"}</div>
+                <div style={{position: "fixed", right: 0, top: "50%", zIndex: 1}}
+                     onClick={this.scrollCardsWrap()}>{">"}</div>
+                <Motion style={{left: spring(currentLeft)}}>
+                    {value => {
+                        Object.assign(value, {
+                            flexWrap: "nowrap",
+                            position: "relative"
+                        })
+                        return (
+                            <div className="row"
+                                 style={value}
+                                 ref={c => updateRow(c)}>
+                                {this.props.children}
+                            </div>)
+                    }
+                    }
+                </Motion>
+            </div>
+        )
+    },
+
+    scrollCardsWrap(params){
+        return () => {
+            this.scrollCards(params)
+        }
+    },
+    //TODO write TESTS!!!
+    scrollCards({toLeft=false, number=1}={}){
+        if (toLeft && this.state.currentCard - number < 0) {
+            // gonna scroll too much to the left so just scroll to the first card
+            number = this.state.currentCard
+        }
+        const cardWidth = this.props.getCardWidth()
+        const visibleCardCount = Math.floor(this._row.clientWidth / cardWidth)
+        const cardCount = this.props.getCardCount()
+        if (!toLeft && this.state.currentCard + visibleCardCount + number > cardCount) {
+            // gonna scroll too much to the right so scroll so the last card is at the right
+            number = -this.state.currentCard + cardCount - visibleCardCount
+        }
+        let currentCard = this.state.currentCard + (toLeft ? -number : number)
+        if (currentCard < 0) {
+            // case where we wanna display last card at the right but not enough cards
+            currentCard = 0
+        }
+        const currentLeft = -currentCard * cardWidth
+        this.setState({currentLeft, currentCard})
+    }
+})
+
+export default CardScroll;