Render to Layer component

package.json

@@ -29,6 +29,10 @@
     "url": "https://github.com/callemall/material-ui/issues"
   },
   "homepage": "http://material-ui.com/",
+  "dependencies": {
+    "lodash.throttle": "~3.0.4",
+    "lodash.debounce": "~3.1.1"
+  },
   "peerDependencies": {
     "inline-style-prefixer": "^0.3.3",
     "react": "^0.14.0",

src/render-to-layer.js

@@ -0,0 +1,123 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import Events from './utils/events';
+import Dom from './utils/dom';
+import debounce from 'lodash.debounce';
+
+// heavily inspired by https://github.com/Khan/react-components/blob/master/js/layered-component-mixin.jsx
+const RenderToLayer = React.createClass({
+
+  componentDidMount() {
+    this._renderLayer();
+  },
+
+  componentDidUpdate() {
+    this._renderLayer();
+  },
+
+  componentWillUnmount() {
+    this._unbindClickAway();
+    if (this._layer) {
+      this._unrenderLayer();
+    }
+  },
+
+  _checkClickAway(e) {
+    if (!this.canClickAway) {
+      return;
+    }
+    const el = this._layer;
+    if (e.target !== el &&
+        !Dom.isDescendant(el, e.target) &&
+        document.documentElement.contains(e.target)) {
+      if (this.props.componentClickAway) {
+        this.props.componentClickAway(e);
+      }
+    }
+  },
+
+  _preventClickAway(e) {
+    if (e.detail === this) {
+      return;
+    }
+    this.canClickAway = false;
+  },
+
+  _allowClickAway() {
+    this.canClickAway = true;
+  },
+
+  getLayer() {
+    return this._layer;
+  },
+
+  render() {
+    return null;
+  },
+
+  _renderLayer() {
+    if (this.props.open) {
+      if (!this._layer) {
+        this._layer = document.createElement('div');
+        document.body.appendChild(this._layer);
+      }
+      this._bindClickAway();
+      if (this.reactUnmount) {
+        this.reactUnmount.cancel();
+      }
+    } else if (this._layer) {
+      this._unbindClickAway();
+      this._unrenderLayer();
+    } else {
+      return;
+    }
+
+    // By calling this method in componentDidMount() and
+    // componentDidUpdate(), you're effectively creating a "wormhole" that
+    // funnels React's hierarchical updates through to a DOM node on an
+    // entirely different part of the page.
+
+    const layerElement = this.props.render();
+    // Renders can return null, but React.render() doesn't like being asked
+    // to render null. If we get null back from renderLayer(), just render
+    // a noscript element, like React does when an element's render returns
+    // null.
+    if (layerElement === null) {
+        this.layerElement = ReactDOM.unstable_renderSubtreeIntoContainer (this, <noscript />, this._layer);
+    } else {
+        this.layerElement = ReactDOM.unstable_renderSubtreeIntoContainer(this, layerElement, this._layer);
+    }
+  },
+
+  _unrenderLayer: function() {
+    if (this.layerWillUnmount) {
+        this.layerWillUnmount(this._layer);
+    }
+    if (!this.reactUnmount)
+      this.reactUnmount = debounce(() => {
+        if (this._layer) {
+          ReactDOM.unmountComponentAtNode(this._layer);
+          document.body.removeChild(this._layer);
+          this._layer = null;
+        }
+      }, 1000);
+    this.reactUnmount();
+  },
+
+  _bindClickAway() {
+    this.canClickAway = true;
+    Events.on(document, 'mousedown', this._checkClickAway);
+    Events.on(document, 'touchend', this._checkClickAway);
+    Events.on(document, 'popOverOnShow', this._preventClickAway);
+    Events.on(document, 'popOverOnHide', this._allowClickAway);
+  },
+
+  _unbindClickAway() {
+    Events.off(document, 'mousedown', this._checkClickAway);
+    Events.off(document, 'touchend', this._checkClickAway);
+    Events.off(document, 'popOverOnShow', this._preventClickAway);
+    Events.off(document, 'popOverOnHide', this._allowClickAway);
+  },
+});
+
+export default RenderToLayer;