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window.wp = window.wp || {};
(function ($) {
// Create the WordPress Backbone namespace.
wp.Backbone = {};
// wp.Backbone.Subviews
// --------------------
//
// A subview manager.
wp.Backbone.Subviews = function( view, views ) {
this.view = view;
this._views = _.isArray( views ) ? { '': views } : views || {};
};
wp.Backbone.Subviews.extend = Backbone.Model.extend;
_.extend( wp.Backbone.Subviews.prototype, {
// ### Fetch all of the subviews
//
// Returns an array of all subviews.
all: function() {
return _.flatten( _.values( this._views ) );
},
// ### Get a selector's subviews
//
// Fetches all subviews that match a given `selector`.
//
// If no `selector` is provided, it will grab all subviews attached
// to the view's root.
get: function( selector ) {
selector = selector || '';
return this._views[ selector ];
},
// ### Get a selector's first subview
//
// Fetches the first subview that matches a given `selector`.
//
// If no `selector` is provided, it will grab the first subview
// attached to the view's root.
//
// Useful when a selector only has one subview at a time.
first: function( selector ) {
var views = this.get( selector );
return views && views.length ? views[0] : null;
},
// ### Register subview(s)
//
// Registers any number of `views` to a `selector`.
//
// When no `selector` is provided, the root selector (the empty string)
// is used. `views` accepts a `Backbone.View` instance or an array of
// `Backbone.View` instances.
//
// ---
//
// Accepts an `options` object, which has a significant effect on the
// resulting behavior.
//
// `options.silent` – *boolean, `false`*
// > If `options.silent` is true, no DOM modifications will be made.
//
// `options.add` – *boolean, `false`*
// > Use `Views.add()` as a shortcut for setting `options.add` to true.
//
// > By default, the provided `views` will replace
// any existing views associated with the selector. If `options.add`
// is true, the provided `views` will be added to the existing views.
//
// `options.at` – *integer, `undefined`*
// > When adding, to insert `views` at a specific index, use
// `options.at`. By default, `views` are added to the end of the array.
set: function( selector, views, options ) {
var existing, next;
if ( ! _.isString( selector ) ) {
options = views;
views = selector;
selector = '';
}
options = options || {};
views = _.isArray( views ) ? views : [ views ];
existing = this.get( selector );
next = views;
if ( existing ) {
if ( options.add ) {
if ( _.isUndefined( options.at ) ) {
next = existing.concat( views );
} else {
next = existing;
next.splice.apply( next, [ options.at, 0 ].concat( views ) );
}
} else {
_.each( next, function( view ) {
view.__detach = true;
});
_.each( existing, function( view ) {
if ( view.__detach )
view.$el.detach();
else
view.remove();
});
_.each( next, function( view ) {
delete view.__detach;
});
}
}
this._views[ selector ] = next;
_.each( views, function( subview ) {
var constructor = subview.Views || wp.Backbone.Subviews,
subviews = subview.views = subview.views || new constructor( subview );
subviews.parent = this.view;
subviews.selector = selector;
}, this );
if ( ! options.silent )
this._attach( selector, views, _.extend({ ready: this._isReady() }, options ) );
return this;
},
// ### Add subview(s) to existing subviews
//
// An alias to `Views.set()`, which defaults `options.add` to true.
//
// Adds any number of `views` to a `selector`.
//
// When no `selector` is provided, the root selector (the empty string)
// is used. `views` accepts a `Backbone.View` instance or an array of
// `Backbone.View` instances.
//
// Use `Views.set()` when setting `options.add` to `false`.
//
// Accepts an `options` object. By default, provided `views` will be
// inserted at the end of the array of existing views. To insert
// `views` at a specific index, use `options.at`. If `options.silent`
// is true, no DOM modifications will be made.
//
// For more information on the `options` object, see `Views.set()`.
add: function( selector, views, options ) {
if ( ! _.isString( selector ) ) {
options = views;
views = selector;
selector = '';
}
return this.set( selector, views, _.extend({ add: true }, options ) );
},
// ### Stop tracking subviews
//
// Stops tracking `views` registered to a `selector`. If no `views` are
// set, then all of the `selector`'s subviews will be unregistered and
// removed.
//
// Accepts an `options` object. If `options.silent` is set, `remove`
// will *not* be triggered on the unregistered views.
unset: function( selector, views, options ) {
var existing;
if ( ! _.isString( selector ) ) {
options = views;
views = selector;
selector = '';
}
views = views || [];
if ( existing = this.get( selector ) ) {
views = _.isArray( views ) ? views : [ views ];
this._views[ selector ] = views.length ? _.difference( existing, views ) : [];
}
if ( ! options || ! options.silent )
_.invoke( views, 'remove' );
return this;
},
// ### Detach all subviews
//
// Detaches all subviews from the DOM.
//
// Helps to preserve all subview events when re-rendering the master
// view. Used in conjunction with `Views.render()`.
detach: function() {
$( _.pluck( this.all(), 'el' ) ).detach();
return this;
},
// ### Render all subviews
//
// Renders all subviews. Used in conjunction with `Views.detach()`.
render: function() {
var options = {
ready: this._isReady()
};
_.each( this._views, function( views, selector ) {
this._attach( selector, views, options );
}, this );
this.rendered = true;
return this;
},
// ### Remove all subviews
//
// Triggers the `remove()` method on all subviews. Detaches the master
// view from its parent. Resets the internals of the views manager.
//
// Accepts an `options` object. If `options.silent` is set, `unset`
// will *not* be triggered on the master view's parent.
remove: function( options ) {
if ( ! options || ! options.silent ) {
if ( this.parent && this.parent.views )
this.parent.views.unset( this.selector, this.view, { silent: true });
delete this.parent;
delete this.selector;
}
_.invoke( this.all(), 'remove' );
this._views = [];
return this;
},
// ### Replace a selector's subviews
//
// By default, sets the `$target` selector's html to the subview `els`.
//
// Can be overridden in subclasses.
replace: function( $target, els ) {
$target.html( els );
return this;
},
// ### Insert subviews into a selector
//
// By default, appends the subview `els` to the end of the `$target`
// selector. If `options.at` is set, inserts the subview `els` at the
// provided index.
//
// Can be overridden in subclasses.
insert: function( $target, els, options ) {
var at = options && options.at,
$children;
if ( _.isNumber( at ) && ($children = $target.children()).length > at )
$children.eq( at ).before( els );
else
$target.append( els );
return this;
},
// ### Trigger the ready event
//
// **Only use this method if you know what you're doing.**
// For performance reasons, this method does not check if the view is
// actually attached to the DOM. It's taking your word for it.
//
// Fires the ready event on the current view and all attached subviews.
ready: function() {
this.view.trigger('ready');
// Find all attached subviews, and call ready on them.
_.chain( this.all() ).map( function( view ) {
return view.views;
}).flatten().where({ attached: true }).invoke('ready');
},
// #### Internal. Attaches a series of views to a selector.
//
// Checks to see if a matching selector exists, renders the views,
// performs the proper DOM operation, and then checks if the view is
// attached to the document.
_attach: function( selector, views, options ) {
var $selector = selector ? this.view.$( selector ) : this.view.$el,
managers;
// Check if we found a location to attach the views.
if ( ! $selector.length )
return this;
managers = _.chain( views ).pluck('views').flatten().value();
// Render the views if necessary.
_.each( managers, function( manager ) {
if ( manager.rendered )
return;
manager.view.render();
manager.rendered = true;
}, this );
// Insert or replace the views.
this[ options.add ? 'insert' : 'replace' ]( $selector, _.pluck( views, 'el' ), options );
// Set attached and trigger ready if the current view is already
// attached to the DOM.
_.each( managers, function( manager ) {
manager.attached = true;
if ( options.ready )
manager.ready();
}, this );
return this;
},
// #### Internal. Checks if the current view is in the DOM.
_isReady: function() {
var node = this.view.el;
while ( node ) {
if ( node === document.body )
return true;
node = node.parentNode;
}
return false;
}
});
// wp.Backbone.View
// ----------------
//
// The base view class.
wp.Backbone.View = Backbone.View.extend({
// The constructor for the `Views` manager.
Subviews: wp.Backbone.Subviews,
constructor: function( options ) {
this.views = new this.Subviews( this, this.views );
this.on( 'ready', this.ready, this );
this.options = options || {};
Backbone.View.apply( this, arguments );
},
remove: function() {
var result = Backbone.View.prototype.remove.apply( this, arguments );
// Recursively remove child views.
if ( this.views )
this.views.remove();
return result;
},
render: function() {
var options;
if ( this.prepare )
options = this.prepare();
this.views.detach();
if ( this.template ) {
options = options || {};
this.trigger( 'prepare', options );
this.$el.html( this.template( options ) );
}
this.views.render();
return this;
},
prepare: function() {
return this.options;
},
ready: function() {}
});
}(jQuery));