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YUI.add('app-transitions', function (Y, NAME) {

/**

`Y.App` extension that provides view transitions in browsers which support

native CSS3 transitions.

@module app

@submodule app-transitions

@since 3.5.0

**/

/**

`Y.App` extension that provides view transitions in browsers which support

native CSS3 transitions.

View transitions provide an nice way to move from one "page" to the next that is

both pleasant to the user and helps to communicate a hierarchy between sections

of an application.

When the `"app-transitions"` module is used, it will automatically mix itself

into `Y.App` and transition between `activeView` changes using the following

effects:

  - **`fade`**: Cross-fades between the old an new active views.

  - **`slideLeft`**: The old and new active views are positioned next to each

    other and both slide to the left.

  - **`slideRight`**: The old and new active views are positioned next to each

    other and both slide to the right.

**Note:** Transitions are an opt-in feature and are enabled via an app's

`transitions` attribute.

@class App.Transitions

@uses App.TransitionsNative

@extensionfor App

@since 3.5.0

**/

function AppTransitions() {}

AppTransitions.ATTRS = {

    /**

    Whether or not this application should use view transitions, and if so then

    which ones or `true` for the defaults which are specified by the

    `transitions` prototype property.

    **Note:** Transitions are an opt-in feature and will only be used in

    browsers which support native CSS3 transitions.

    @attribute transitions

    @type Boolean|Object

    @default false

    @since 3.5.0

    **/

    transitions: {

        setter: '_setTransitions',

        value : false

    }

};

/**

Collect of transitions -> fx.

A transition (e.g. "fade") is a simple name given to a configuration of fx to

apply, consisting of `viewIn` and `viewOut` properties who's values are names of

fx registered on `Y.Transition.fx`.

By default transitions: `fade`, `slideLeft`, and `slideRight` have fx defined.

@property FX

@type Object

@static

@since 3.5.0

**/

AppTransitions.FX = {

    fade: {

        viewIn : 'app:fadeIn',

        viewOut: 'app:fadeOut'

    },

    slideLeft: {

        viewIn : 'app:slideLeft',

        viewOut: 'app:slideLeft'

    },

    slideRight: {

        viewIn : 'app:slideRight',

        viewOut: 'app:slideRight'

    }

};

AppTransitions.prototype = {

    // -- Public Properties ----------------------------------------------------

    /**

    Default transitions to use when the `activeView` changes.

    The following are types of changes for which transitions can be defined that

    correspond to the relationship between the new and previous `activeView`:

      * `navigate`: The default transition to use when changing the `activeView`

        of the application.

      * `toChild`: The transition to use when the new `activeView` is configured

        as a child of the previously active view via its `parent` property as

        defined in this app's `views`.

      * `toParent`: The transition to use when the new `activeView` is

        configured as the `parent` of the previously active view as defined in

        this app's `views`.

    **Note:** Transitions are an opt-in feature and will only be used in

    browsers which support native CSS3 transitions.

    @property transitions

    @type Object

    @default

        {

            navigate: 'fade',

            toChild : 'slideLeft',

            toParent: 'slideRight'

        }

    @since 3.5.0

    **/

    transitions: {

        navigate: 'fade',

        toChild : 'slideLeft',

        toParent: 'slideRight'

    },

    // -- Public Methods -------------------------------------------------------

    /**

    Sets which view is active/visible for the application. This will set the

    app's `activeView` attribute to the specified `view`.

    The `view` will be "attached" to this app, meaning it will be both rendered

    into this app's `viewContainer` node and all of its events will bubble to

    the app. The previous `activeView` will be "detached" from this app.

    When a string-name is provided for a view which has been registered on this

    app's `views` object, the referenced metadata will be used and the

    `activeView` will be set to either a preserved view instance, or a new

    instance of the registered view will be created using the specified `config`

    object passed-into this method.

    A callback function can be specified as either the third or fourth argument,

    and this function will be called after the new `view` becomes the

    `activeView`, is rendered to the `viewContainer`, and is ready to use.

    @example

        var app = new Y.App({

            views: {

                usersView: {

                    // Imagine that `Y.UsersView` has been defined.

                    type: Y.UsersView

                }

            },

            transitions: true,

            users      : new Y.ModelList()

        });

        app.route('/users/', function () {

            this.showView('usersView', {users: this.get('users')});

        });

        app.render();

        app.navigate('/uses/');

        // => Creates a new `Y.UsersView` and transitions to it.

    @method showView

    @param {String|View} view The name of a view defined in the `views` object,

        or a view instance which should become this app's `activeView`.

    @param {Object} [config] Optional configuration to use when creating a new

        view instance. This config object can also be used to update an existing

        or preserved view's attributes when `options.update` is `true`.

    @param {Object} [options] Optional object containing any of the following

        properties:

      @param {Function} [options.callback] Optional callback function to call

        after new `activeView` is ready to use, the function will be passed:

          @param {View} options.callback.view A reference to the new

            `activeView`.

      @param {Boolean} [options.prepend=false] Whether the `view` should be

        prepended instead of appended to the `viewContainer`.

      @param {Boolean} [options.render] Whether the `view` should be rendered.

        **Note:** If no value is specified, a view instance will only be

        rendered if it's newly created by this method.

      @param {Boolean|String} [options.transition] Optional transition override.

        A transition can be specified which will override the default, or

        `false` for no transition.

      @param {Boolean} [options.update=false] Whether an existing view should

        have its attributes updated by passing the `config` object to its

        `setAttrs()` method. **Note:** This option does not have an effect if

        the `view` instance is created as a result of calling this method.

    @param {Function} [callback] Optional callback Function to call after the

        new `activeView` is ready to use. **Note:** this will override

        `options.callback` and it can be specified as either the third or fourth

        argument. The function will be passed the following:

      @param {View} callback.view A reference to the new `activeView`.

    @chainable

    @since 3.5.0

    **/

    // Does not override `showView()` but does use `options.transitions`.

    // -- Protected Methods ----------------------------------------------------

    /**

    Setter for `transitions` attribute.

    When specified as `true`, the defaults will be use as specified by the

    `transitions` prototype property.

    @method _setTransitions

    @param {Boolean|Object} transitions The new `transitions` attribute value.

    @return {Mixed} The processed value which represents the new state.

    @protected

    @see App.Base.showView()

    @since 3.5.0

    **/

    _setTransitions: function (transitions) {

        var defTransitions = this.transitions;

        if (transitions && transitions === true) {

            return Y.merge(defTransitions);

        }

        return transitions;

    }

};

// -- Namespace ----------------------------------------------------------------

Y.App.Transitions = AppTransitions;

Y.Base.mix(Y.App, [AppTransitions]);

Y.mix(Y.App.CLASS_NAMES, {

    transitioning: Y.ClassNameManager.getClassName('app', 'transitioning')

});

}, '3.18.1', {"requires": ["app-base"]});