Getting started on draggable columns

app/assets/javascripts/components/features/ui/components/column.jsx

@@ -1,5 +1,6 @@
-import ColumnHeader    from './column_header';
+import ColumnHeader from './column_header';
 import PureRenderMixin from 'react-addons-pure-render-mixin';
+import { DragSource } from 'react-dnd';
 
 const easingOutQuint = (x, t, b, c, d) => c*((t=t/d-1)*t*t*t*t + 1) + b;
 
@@ -36,9 +37,22 @@ const style = {
   flexDirection: 'column'
 };
 
+const columnSource = {
+  beginDrag (props) {
+    return {};
+  }
+};
+
+const collect = (connect, monitor) => ({
+  connectDragSource: connect.dragSource(),
+  isDragging: monitor.isDragging()
+});
+
 const Column = React.createClass({
 
   propTypes: {
+    connectDragSource: React.PropTypes.func.isRequired,
+    isDragging: React.PropTypes.bool.isRequired,
     heading: React.PropTypes.string,
     icon: React.PropTypes.string,
     children: React.PropTypes.node
@@ -58,20 +72,22 @@ const Column = React.createClass({
   },
 
   render () {
+    const { heading, icon, children, connectDragSource, isDragging } = this.props;
+
     let header = '';
 
-    if (this.props.heading) {
-      header = <ColumnHeader icon={this.props.icon} type={this.props.heading} onClick={this.handleHeaderClick} />;
+    if (heading) {
+      header = <ColumnHeader icon={icon} type={heading} onClick={this.handleHeaderClick} />;
     }
 
-    return (
-      <div className='column' style={style} onWheel={this.handleWheel}>
+    return connectDragSource(
+      <div className='column' style={{...style, opacity: isDragging ? '0.5' : '1' }} onWheel={this.handleWheel}>
         {header}
-        {this.props.children}
+        {children}
       </div>
     );
   }
 
 });
 
-export default Column;
+export default DragSource('column', columnSource, collect)(Column);

app/assets/javascripts/components/features/ui/index.jsx

@@ -13,6 +13,8 @@ import { debounce } from 'react-decoration';
 import { uploadCompose } from '../../actions/compose';
 import { refreshTimeline } from '../../actions/timelines';
 import { refreshNotifications } from '../../actions/notifications';
+import { DragDropContext } from 'react-dnd';
+import HTML5Backend from 'react-dnd-html5-backend';
 
 const UI = React.createClass({
 
@@ -103,4 +105,4 @@ const UI = React.createClass({
 
 });
 
-export default connect()(UI);
+export default connect()(DragDropContext(HTML5Backend)(UI));

package.json

@@ -42,6 +42,8 @@
     "react-addons-test-utils": "^15.3.2",
     "react-autosuggest": "^7.0.1",
     "react-decoration": "^1.4.0",
+    "react-dnd": "^2.1.4",
+    "react-dnd-html5-backend": "^2.1.2",
     "react-dom": "^15.3.0",
     "react-imageloader": "^2.1.0",
     "react-immutable-proptypes": "^2.1.0",

yarn.lock

@@ -269,7 +269,7 @@ arrify@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
 
-asap@~2.0.3:
+asap@^2.0.3, asap@~2.0.3:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/asap/-/asap-2.0.5.tgz#522765b50c3510490e52d7dcfe085ef9ba96958f"
 
@@ -2098,6 +2098,19 @@ diffie-hellman@^5.0.0:
     miller-rabin "^4.0.0"
     randombytes "^2.0.0"
 
+disposables@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/disposables/-/disposables-1.0.1.tgz#064727a25b54f502bd82b89aa2dfb8df9f1b39e3"
+
+dnd-core@^2.0.1:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/dnd-core/-/dnd-core-2.0.2.tgz#4528da4fbeb1abb6c308414b2d2e8389f3514646"
+  dependencies:
+    asap "^2.0.3"
+    invariant "^2.0.0"
+    lodash "^4.2.0"
+    redux "^3.2.0"
+
 dom-helpers@^2.4.0:
   version "2.4.0"
   resolved "https://registry.yarnpkg.com/dom-helpers/-/dom-helpers-2.4.0.tgz#9bb4b245f637367b1fa670274272aa28fe06c367"
@@ -2938,7 +2951,7 @@ intl-relativeformat@^1.3.0:
   dependencies:
     intl-messageformat "1.3.0"
 
-invariant@2.x.x, invariant@^2.0.0, invariant@^2.1.1, invariant@^2.2.0, invariant@^2.2.1:
+invariant@2.x.x, invariant@^2.0.0, invariant@^2.1.0, invariant@^2.1.1, invariant@^2.2.0, invariant@^2.2.1:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/invariant/-/invariant-2.2.2.tgz#9e1f56ac0acdb6bf303306f338be3b204ae60360"
   dependencies:
@@ -4581,6 +4594,21 @@ react-deep-force-update@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/react-deep-force-update/-/react-deep-force-update-1.0.1.tgz#f911b5be1d2a6fe387507dd6e9a767aa2924b4c7"
 
+react-dnd-html5-backend@^2.1.2:
+  version "2.1.2"
+  resolved "https://registry.yarnpkg.com/react-dnd-html5-backend/-/react-dnd-html5-backend-2.1.2.tgz#bcff5866629c335b310b1062fe6537af35073c66"
+  dependencies:
+    lodash "^4.2.0"
+
+react-dnd@^2.1.4:
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/react-dnd/-/react-dnd-2.1.4.tgz#dd2afeddddd5ff4507d795a5bd44361c84374c0f"
+  dependencies:
+    disposables "^1.0.1"
+    dnd-core "^2.0.1"
+    invariant "^2.1.0"
+    lodash "^4.2.0"
+
 "react-dom@^0.14.0 || ^15.0.0", react-dom@^15.3.0:
   version "15.3.2"
   resolved "https://registry.yarnpkg.com/react-dom/-/react-dom-15.3.2.tgz#c46b0aa5380d7b838e7a59c4a7beff2ed315531f"
@@ -4872,7 +4900,7 @@ redux-thunk@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/redux-thunk/-/redux-thunk-2.1.0.tgz#c724bfee75dbe352da2e3ba9bc14302badd89a98"
 
-redux@^3.5.2, redux@^3.6.0:
+redux@^3.2.0, redux@^3.5.2, redux@^3.6.0:
   version "3.6.0"
   resolved "https://registry.yarnpkg.com/redux/-/redux-3.6.0.tgz#887c2b3d0b9bd86eca2be70571c27654c19e188d"
   dependencies: