diff --git a/event-helpers.js b/event-helpers.js
index 4ddccf3..18c9fad 100644
--- a/event-helpers.js
+++ b/event-helpers.js
@@ -7,7 +7,47 @@
  */
 export const EventHelpers = function(superClass) {
   return class extends superClass {
-    listen(node, eventName, cbName) {
+    listen(node, eventName, cbName, options) {
+      const boundListener = this.__registerListener(cbName, node, eventName);
+
+      if (eventName === 'track') {
+        this._track(node, boundListener);
+        return;
+      }
+
+      node.addEventListener(eventName, boundListener, options);
+    }
+
+    /**
+     * Remove an event listener bound to the context of the superClass.
+     *
+     * @param  {HTMLElement} node Element to attach the event listener to.
+     * @param  {String} eventName Name of the event.
+     * @param  {String} cbName    Name of the handler.
+     */
+    unlisten(node, eventName, cbName, options) {
+      this.__boundEventListeners = this.__boundEventListeners || new WeakMap();
+      const listeners = this.__boundEventListeners.get(node);
+      const eventKey = `${eventName}_${cbName}`;
+
+      if (listeners && typeof listeners[eventKey]) {
+        node.removeEventListener(eventName, listeners[eventKey], options);
+        listeners[eventKey] = null;
+      }
+    }
+
+    once(node, eventName, cbName, options) {
+      const wrappedCbName = `__onceCb__${cbName}`;
+
+      this[wrappedCbName] = (...args) => {
+        this[cbName](...args);
+        this.unlisten(node, eventName, wrappedCbName, options);
+      };
+
+      this.listen(node, eventName, wrappedCbName, options);
+    }
+
+    __registerListener(cbName, node, eventName) {
       this.__boundEventListeners = this.__boundEventListeners || new WeakMap();
       const boundListener = this[cbName].bind(this);
       const eventKey = `${eventName}_${cbName}`;
@@ -22,36 +62,49 @@ export const EventHelpers = function(superClass) {
 
       listeners[eventKey] = boundListener;
       this.__boundEventListeners.set(node, listeners);
-      node.addEventListener(eventName, boundListener);
+
+      return boundListener;
     }
 
-    /**
-     * Remove an event listener bound to the context of the superClass.
-     *
-     * @param  {HTMLElement} node Element to attach the event listener to.
-     * @param  {String} eventName Name of the event.
-     * @param  {String} cbName    Name of the handler.
-     */
-    unlisten(node, eventName, cbName) {
-      this.__boundEventListeners = this.__boundEventListeners || new WeakMap();
-      const listeners = this.__boundEventListeners.get(node);
-      const eventKey = `${eventName}_${cbName}`;
+    _track(node, boundListener) {
+      this._boundTrackingListener = boundListener;
+      this.listen(node, 'mousedown', '_trackMouseDown');
+    }
 
-      if (listeners && typeof listeners[eventKey]) {
-        node.removeEventListener(eventName, listeners[eventKey]);
-        listeners[eventKey] = null;
+    _trackMouseDown(e) {
+      this._trackInfo = {
+        originX: e.clientX,
+        originY: e.clientY,
+        started: false
+      };
+
+      this.listen(window, 'mousemove', '_trackMouseMove', true);
+      this.once(window, 'mouseup', '_trackMouseUp');
+    }
+
+    _trackMouseMove(e) {
+      if (!this._trackInfo.started && trackHasMovedEnough(this._trackInfo, e.clientX, e.clientY)) {
+        this._trackInfo.started = true;
+        this._boundTrackingListener(new CustomEvent('track', { detail: { state: 'start', dx: e.clientX - this._trackInfo.originX, dy: e.clientY - this._trackInfo.originY }, bubbles: true, composed: true }));
+      }
+
+      if (this._trackInfo.started) {
+        this._boundTrackingListener(new CustomEvent('track', { detail: { state: 'track', dx: e.clientX - this._trackInfo.originX, dy: e.clientY - this._trackInfo.originY }, bubbles: true, composed: true }));
       }
     }
 
-    once(node, eventName, cbName) {
-      const wrappedCbName = `__onceCb__${cbName}`;
-
-      this[wrappedCbName] = (...args) => {
-        this[cbName](...args);
-        this.unlisten(node, eventName, wrappedCbName);
-      };
-
-      this.listen(node, eventName, wrappedCbName);
+    _trackMouseUp(e) {
+      this._boundTrackingListener(new CustomEvent('track', { detail: { state: 'end', dx: e.clientX - this._trackInfo.originX, dy: e.clientY - this._trackInfo.originY }, bubbles: true, composed: true }));
+      this.unlisten(window, 'mousemove', '_trackMouseMove', true);
+      this._trackInfo = null;
     }
   }
-}
\ No newline at end of file
+}
+
+const TRACK_DISTANCE = 5;
+
+function trackHasMovedEnough(info, x, y) {
+  let dx = Math.abs(info.originX - x);
+  let dy = Math.abs(info.originY - y);
+  return (dx >= TRACK_DISTANCE || dy >= TRACK_DISTANCE);
+}
diff --git a/sort.js b/sort.js
new file mode 100644
index 0000000..29661e5
--- /dev/null
+++ b/sort.js
@@ -0,0 +1,104 @@
+import { reach } from './reach.js';
+
+/**
+ * Sort collection asc by some field.
+ *
+ * @param  {String} field      Field to sort by.
+ * @param  {Array}  collection Collection to sort.
+ * @return {Array}             The sorted collection.
+ */
+const sortAsc = (field, collection) => {
+  return collection.sort(function(a, b) {
+    let s1 = reach(field, a);
+    let s2 = reach(field, b);
+
+    if (typeof s1 === 'string') {
+      s1 = s1.toLowerCase();
+    }
+
+    if (typeof s2 === 'string') {
+      s2 = s2.toLowerCase();
+    }
+
+    return naturalCompare(s1, s2);
+  }.bind(this));
+}
+
+/**
+ * Sort collection desc by some field.
+ *
+ * @param  {String} field      Field to sort by.
+ * @param  {Array}  collection Collection to sort.
+ * @return {Array}             The sorted collection.
+ */
+const sortDesc = (field, collection) => {
+  return collection.sort(function(a, b) {
+    let s1 = reach(field, a);
+    let s2 = reach(field, b);
+
+    if (typeof s1 === 'string') {
+      s1 = s1.toLowerCase();
+    }
+
+    if (typeof s2 === 'string') {
+      s2 = s2.toLowerCase();
+    }
+
+    return naturalCompare(s2, s1);
+  }.bind(this));
+}
+
+/**
+* Sort strings naturally.
+*
+* @version    1.4.0
+* @date       2015-10-26
+* @stability  3 - Stable
+* @author     Lauri Rooden (https://github.com/litejs/natural-compare-lite)
+* @license    MIT License
+*
+* @param  {String} a
+* @param  {String} b
+* @return {Number}   -1, 1 or 0.
+*/
+const naturalCompare = (a, b) => {
+  let i;
+  let codeA;
+  let codeB = 1;
+  let posA = 0;
+  let posB = 0;
+  const alphabet = String.alphabet;
+
+  function getCode(str, pos, code) {
+    if (code) {
+      for (i = pos; code = getCode(str, i), code < 76 && code > 65;) ++i;
+      return Number(str.slice(pos - 1, i));
+    }
+    code = alphabet && alphabet.indexOf(str.charAt(pos));
+    return code > -1 ? code + 76 : ((code = str.charCodeAt(pos) || 0), code < 45 || code > 127) ? code
+      : code < 46 ? 65               // -
+      : code < 48 ? code - 1
+      : code < 58 ? code + 18        // 0-9
+      : code < 65 ? code - 11
+      : code < 91 ? code + 11        // A-Z
+      : code < 97 ? code - 37
+      : code < 123 ? code + 5        // a-z
+      : code - 63;
+  }
+
+  if ((a += '') != (b += '')) for (;codeB;) {
+    codeA = getCode(a, posA++);
+    codeB = getCode(b, posB++);
+
+    if (codeA < 76 && codeB < 76 && codeA > 66 && codeB > 66) {
+      codeA = getCode(a, posA, posA);
+      codeB = getCode(b, posB, posA = i);
+      posB = i;
+    }
+
+    if (codeA != codeB) return (codeA < codeB) ? -1 : 1;
+  }
+  return 0;
+}
+
+export { sortAsc, sortDesc, naturalCompare };