stop hooking addListener.

lib/widget.js

@@ -164,19 +164,20 @@ function Screen(options) {
     self.program.showCursor();
     self.program.normalBuffer();
   });
+
+  this.on('newListener', function fn(type) {
+    if (type === 'keypress' || type === 'mouse') {
+      self.removeListener('newListener', fn);
+      if (type === 'keypress') self._listenKeys();
+      if (type === 'mouse') self._listenMouse();
+    }
+  });
 }
 
 Screen._default = null;
 
 Screen.prototype.__proto__ = Node.prototype;
 
-Screen._addListener = Screen.prototype.addListener;
-Screen.prototype.on =
-Screen.prototype.addListener = function(type, listener) {
-  if (type === 'keypress') this._listenKeys();
-  return Screen._addListener.apply(this, arguments);
-};
-
 // TODO: Bubble events.
 Screen.prototype._listenMouse = function(el, hover) {
   var self = this;
@@ -509,6 +510,8 @@ Screen.prototype.fillRegion = function(attr, ch, xi, xl, yi, yl) {
  */
 
 function Element(options) {
+  var self = this;
+
   Node.call(this, options);
 
   this.position = {
@@ -560,31 +563,28 @@ function Element(options) {
       top: this.border ? 0 : -1
     }));
   }
+
+  // TODO: Possibly move this to Node for screen.on('mouse', ...).
+  this.on('newListener', function fn(type) {
+    if (type === 'mouse'
+      || type === 'click'
+      || type === 'hover'
+      || type === 'mousedown'
+      || type === 'mouseup'
+      || type === 'mousewheel'
+      || type === 'wheeldown'
+      || type === 'wheelup'
+      || type === 'mousemove'
+      || type === 'movement') {
+      self.screen._listenMouse(self);
+    } else if (type === 'keypress') {
+      self.screen._listenKeys(self);
+    }
+  });
 }
 
 Element.prototype.__proto__ = Node.prototype;
 
-// TODO: Possibly move this to Node for screen.on('mouse', ...).
-Element._addListener = Element.prototype.addListener;
-Element.prototype.on =
-Element.prototype.addListener = function(type, listener) {
-  if (type === 'mouse'
-    || type === 'click'
-    || type === 'hover'
-    || type === 'mousedown'
-    || type === 'mouseup'
-    || type === 'mousewheel'
-    || type === 'wheeldown'
-    || type === 'wheelup'
-    || type === 'mousemove'
-    || type === 'movement') {
-    this.screen._listenMouse(this);
-  } else if (type === 'keypress') {
-    this.screen._listenKeys(this);
-  }
-  return Element._addListener.apply(this, arguments);
-};
-
 /*
 Element._emit = Element.prototype.emit;
 Element.prototype.emit = function(type) {