Merge branch 'feature/legend_mobile'

app/src/frontend/legend.css

@@ -4,7 +4,7 @@
 .map-legend {
     z-index: 1000;
     position: absolute;
-    bottom: 55px;
+    bottom: 50%;
     right: 10px;
     min-width: 12rem;
     float: right;
@@ -14,7 +14,7 @@
     border: 1px solid #fff;
     box-shadow: 0px 0px 1px 1px #222222;
 }
-@media (min-width: 380px){
+@media (min-width: 768px){
     .map-legend {
         bottom: 40px;
     }
@@ -70,3 +70,11 @@
     padding: 0 0.5rem;
     opacity: 0.5;
 }
+.expander-button {
+    float: right;	
+}
+@media (min-height: 670px) and (min-width: 768px) {
+    .expander-button {
+        visibility: hidden;
+    }
+}

app/src/frontend/legend.js

@@ -96,10 +96,48 @@ const LEGEND_CONFIG = {
     }
 };
 
-const Legend = (props) => {
-    const details = LEGEND_CONFIG[props.slug];
+
+class Legend extends React.Component {
+
+    constructor(props) {
+        super(props);
+        this.state = {collapseList: false};
+        this.handleClick = this.handleClick.bind(this);
+        this.onResize= this.onResize.bind(this);
+    }
+
+
+    handleClick() {
+        this.setState(state => ({
+            collapseList: !state.collapseList
+        }));
+    }
+
+
+    componentDidMount() {  
+        window.addEventListener('resize', this.onResize);
+        if (window && window.outerHeight) {
+            // if we're in the browser, pass in as though from event to initialise
+            this.onResize({target: window});
+        }
+    }
+
+
+    componentWillUnmount() {
+        window.removeEventListener('resize', this.onResize);
+    }
+
+
+    onResize(e) {
+        this.setState({collapseList: (e.target.outerHeight < 670 || e.target.outerWidth < 768)});  // magic number needs to be consistent with CSS expander-button media query 
+    }
+
+
+    render() { 
+        const details = LEGEND_CONFIG[this.props.slug];
         const title = details.title;
         const elements = details.elements;
+
         return (
             <div className="map-legend">
                 <div className="logo">
@@ -128,7 +166,7 @@ const Legend = (props) => {
                         <span>London</span>
                     </h3>
                 </div>
-            <h4 className="h4">{ title }</h4>
+                <h4 className="h4">{ title } {elements.length?<button className="expander-button btn btn-outline-secondary btn-sm" type="button" onClick={this.handleClick} >^</button>:null}</h4>
                 {
                     details.description?
                         <p>{details.description} </p>
@@ -136,10 +174,15 @@ const Legend = (props) => {
                 }
                 {
                     elements.length?
-                    <ul className="data-legend">
+                        <ul className={this.state.collapseList ? 'collapse data-legend' : 'data-legend'} >
                             {
                                 elements.map((item) => (
-                                <LegendItem {...item} key={item.color} />
+
+                                       <li key={item.color} >
+                                            <span className="key" style={ { background: item.color } }>-</span>
+                                            { item.text }
+                                       </li> 
+
                                 ))
                             }
                         </ul>
@@ -147,20 +190,14 @@ const Legend = (props) => {
                 }
             </div>
         );
+
     }
 
+}
+
+
 Legend.propTypes = {
-    slug: PropTypes.string
-}
-
-const LegendItem = (props) => (
-    <li>
-        <span className="key" style={ { background: props.color } }>-</span>
-        { props.text }
-    </li>
-);
-
-LegendItem.propTypes = {
+    slug: PropTypes.string,
     color: PropTypes.string,
     text: PropTypes.string
 }