extjs/packages/core/src/mixin/Hookable.js

   1 /**
   2  * @private
   3  */
   4 Ext.define('Ext.mixin.Hookable', {
   5     extend: 'Ext.Mixin',
   6
   7     mixinConfig: {
   8         id: 'hookable'
   9     },
  10
  11     bindHook: function(instance, boundMethod, bindingMethod, preventDefault, extraArgs) {
  12         if (!bindingMethod) {
  13             bindingMethod = boundMethod;
  14         }
  15
  16         var boundFn = instance[boundMethod],
  17             fn, binding;
  18
  19         if (boundFn && boundFn.hasOwnProperty('$binding')) {
  20             binding = boundFn.$binding;
  21             if (binding.bindingMethod === bindingMethod && binding.bindingScope === this) {
  22                 return this;
  23             }
  24         }
  25
  26         instance[boundMethod] = fn = function() {
  27             var binding = fn.$binding,
  28                 scope = binding.bindingScope,
  29                 args = Array.prototype.slice.call(arguments);
  30
  31             args.push(arguments);
  32
  33             if (extraArgs) {
  34                 args.push.apply(args, extraArgs);
  35             }
  36
  37             if (!binding.preventDefault && scope[binding.bindingMethod].apply(scope, args) !== false) {
  38                 return binding.boundFn.apply(this, arguments);
  39             }
  40         };
  41         fn.$binding = {
  42             preventDefault: !!preventDefault,
  43             boundFn: boundFn,
  44             bindingMethod: bindingMethod,
  45             bindingScope: this
  46         };
  47
  48         return this;
  49     },
  50
  51     unbindHook: function(instance, boundMethod, bindingMethod) {
  52         if (!bindingMethod) {
  53             bindingMethod = boundMethod;
  54         }
  55
  56         var fn = instance[boundMethod],
  57             binding = fn.$binding,
  58             boundFn, currentBinding;
  59
  60         while (binding) {
  61             boundFn = binding.boundFn;
  62
  63             if (binding.bindingMethod === bindingMethod && binding.bindingScope === this) {
  64                 if (currentBinding) {
  65                     currentBinding.boundFn = boundFn;
  66                 }
  67                 else {
  68                     instance[boundMethod] = boundFn;
  69                 }
  70
  71                 return this;
  72             }
  73
  74             currentBinding = binding;
  75             binding = boundFn.$binding;
  76         }
  77
  78         return this;
  79     }
  80 });