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## Overview

Default implementation of $animate that doesn't perform any animations, instead just synchronously performs DOM updates and resolves the returned runner promise.

In order to enable animations the `ngAnimate` module has to be loaded.

To see the functional implementation check out `src/ngAnimate/animate.js`.

## Methods

- ###

  `register(name, factory);`

  Registers a new injectable animation factory function. The factory function produces the animation object which contains callback functions for each event that is expected to be animated.

  - `eventFn`: `function(element, ... , doneFunction, options)` The element to animate, the `doneFunction` and the options fed into the animation. Depending on the type of animation additional arguments will be injected into the animation function. The list below explains the function signatures for the different animation methods:

  - setClass: function(element, addedClasses, removedClasses, doneFunction, options)

  - addClass: function(element, addedClasses, doneFunction, options)
  - removeClass: function(element, removedClasses, doneFunction, options)
  - enter, leave, move: function(element, doneFunction, options)

  - animate: function(element, fromStyles, toStyles, doneFunction, options)

    Make sure to trigger the `doneFunction` once the animation is fully complete.

      return {
        //enter, leave, move signature
        eventFn : function(element, done, options) {
          //code to run the animation
          //once complete, then run done()
          return function endFunction(wasCancelled) {
            //code to cancel the animation
          }
        }
      }

  #### Parameters

  Param | Type | Details
  --- | --- | ---
  name | string | The name of the animation (this is what the class-based CSS value will be compared to).
  factory | Function | The factory function that will be executed to return the animation object.

- ###

  `customFilter([filterFn]);`

  Sets and/or returns the custom filter function that is used to "filter" animations, i.e. determine if an animation is allowed or not. When no filter is specified (the default), no animation will be blocked. Setting the `customFilter` value will only allow animations for which the filter function's return value is truthy.

  This allows to easily create arbitrarily complex rules for filtering animations, such as allowing specific events only, or enabling animations on specific subtrees of the DOM, etc. Filtering animations can also boost performance for low-powered devices, as well as applications containing a lot of structural operations.

  Best Practice: Keep the filtering function as lean as possible, because it will be called for each DOM action (e.g. insertion, removal, class change) performed by "animation-aware" directives. See here for a list of built-in directives that support animations. Performing computationally expensive or time-consuming operations on each call of the filtering function can make your animations sluggish.

  Note: If present, `customFilter` will be checked before classNameFilter.

  #### Parameters

  Param | Type | Details
  --- | --- | ---

  filterFn
  (optional)

  Function=

  The filter function which will be used to filter all animations. If a falsy value is returned, no animation will be performed. The function will be called with the following arguments:
  - node `{DOMElement}` - The DOM element to be animated.
  - event `{String}` - The name of the animation event (e.g. `enter`, `leave`, `addClass` etc).
  - options `{Object}` - A collection of options/styles used for the animation.

  #### Returns

  Function | The current filter function or `null` if there is none set.

- ###

  `classNameFilter([expression]);`

  Sets and/or returns the CSS class regular expression that is checked when performing an animation. Upon bootstrap the classNameFilter value is not set at all and will therefore enable $animate to attempt to perform an animation on any element that is triggered. When setting the `classNameFilter` value, animations will only be performed on elements that successfully match the filter expression. This in turn can boost performance for low-powered devices as well as applications containing a lot of structural operations.

  Note: If present, `classNameFilter` will be checked after customFilter. If `customFilter` is present and returns false, `classNameFilter` will not be checked.

  #### Parameters

  Param | Type | Details
  --- | --- | ---
  expression (optional) | RegExp | The className expression which will be checked against all animations

  #### Returns

  RegExp | The current CSS className expression value. If null then there is no expression value