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var util = require( './util' ),
mfExtend = require( './mfExtend' ),
// Cached regex to split keys for `delegate`.
delegateEventSplitter = /^(\S+)\s*(.*)$/,
idCounter = 0;
/**
* Generate a unique integer id (unique within the entire client session).
* Useful for temporary DOM ids.
* @param {string} prefix Prefix to be used when generating the id.
* @return {string}
*/
function uniqueId( prefix ) {
var id = ( ++idCounter ).toString();
return prefix ? prefix + id : id;
}
/**
* Should be extended using extend().
*
* When options contains el property, this.$el in the constructed object
* will be set to the corresponding jQuery object. Otherwise, this.$el
* will be an empty div.
*
* When extended using extend(), if the extended prototype contains
* template property, this.$el will be filled with rendered template (with
* options parameter used as template data).
*
* template property can be a string which will be passed to mw.template.compile()
* or an object that has a render() function which accepts an object with
* template data as its argument (similarly to an object created by
* mw.template.compile()).
*
* You can also define a defaults property which should be an object
* containing default values for the template (if they're not present in
* the options parameter).
*
* If this.$el is not a jQuery object bound to existing DOM element, the
* view can be attached to an element using appendTo(), prependTo(),
* insertBefore(), insertAfter() proxy functions.
*
* append(), prepend(), before(), after() can be used to modify $el. on()
* can be used to bind events.
*
* You can also use declarative DOM events binding by specifying an `events`
* map on the class. The keys will be 'event selector' and the value can be
* either the name of a method to call, or a function. All methods and
* functions will be executed on the context of the View.
*
* Inspired from Backbone.js
* https://github.com/jashkenas/backbone/blob/master/backbone.js#L1128
*
* Example:
* ```js
* var MyComponent = View.extend( {
* events: {
* 'mousedown .title': 'edit',
* 'click .button': 'save',
* 'click .open': function(e) { ... }
* },
* edit: function ( ev ) {
* //...
* },
* save: function ( ev ) {
* //...
* }
* } );
* ```
*
* Example:
* ```js
* var View, section;
* function Section( options ) {
* View.call( this, options );
* }
* View = require( './View' );
* require( './mfExtend' )( Section, View, {
* template: mw.template.compile( "<h2>{{title}}</h2>" ),
* } );
* section = new Section( { title: 'Test', text: 'Test section body' } );
* section.appendTo( 'body' );
* ```
*
* @class View
* @mixins OO.EventEmitter
*/
function View() {
this.initialize.apply( this, arguments );
}
OO.mixinClass( View, OO.EventEmitter );
mfExtend( View, {
/**
* A css class to apply to the containing element of the View.
* @memberof View
* @instance
* @property {string} className
*/
className: undefined,
/**
* Name of tag that contains the rendered template
* @memberof View
* @instance
* @property {string} tagName
*/
tagName: 'div',
/**
* Tells the View to ignore tagName and className when constructing the element
* and to rely solely on the template
* @memberof View
* @instance
* @property {boolean} isTemplateMode
*/
isTemplateMode: false,
/**
* Whether border box box sizing model should be used
* @memberof View
* @instance
* @property {boolean} isBorderBox
*/
isBorderBox: true,
/**
* @memberof View
* @instance
* @property {Mixed}
* Specifies the template used in render(). Object|string|HoganTemplate
*/
template: undefined,
/**
* Specifies partials (sub-templates) for the main template. Example:
*
* @example
* // example content for the "some" template (sub-template will be
* // inserted where {{>content}} is):
* // <h1>Heading</h1>
* // {{>content}}
*
* oo.mfExtend( SomeView, View, {
* template: M.template.get( 'some.hogan' ),
* templatePartials: { content: M.template.get( 'sub.hogan' ) }
* }
*
* @memberof View
* @instance
* @property {Object}
*/
templatePartials: {},
/**
* A set of default options that are merged with options passed into the initialize
* function.
* @memberof View
* @instance
* @property {Object} defaults Default options hash.
* @property {jQuery.Object|string} [defaults.el] jQuery selector to use for rendering.
* @property {boolean} [defaults.skipTemplateRender] Whether to enhance views already in
* DOM. When enabled, the template is disabled so that it is not rendered in the DOM.
* Use in conjunction with View::defaults.$el to associate the View with an existing
* already rendered element in the DOM.
*/
defaults: {},
/**
* Default events map
* @memberof View
* @instance
*/
events: null,
/**
* Run once during construction to set up the View
* @memberof View
* @instance
* @param {Object} options Object passed to the constructor.
*/
initialize: function ( options ) {
var self = this;
OO.EventEmitter.call( this );
options = util.extend( {}, this.defaults, options );
this.options = options;
// Assign a unique id for dom events binding/unbinding
this.cid = uniqueId( 'view' );
// TODO: if template compilation is too slow, don't compile them on a
// per object basis, but don't worry about it now (maybe add cache to
// M.template.compile())
Iif ( typeof this.template === 'string' ) {
this.template = mw.template.compile( this.template );
}
if ( options.el ) {
// Note the element may not be in the document so must use global jQuery here
this.$el = $( options.el );
} else {
this.$el = this.parseHTML( '<' + this.tagName + '>' );
}
// Make sure the element is ready to be manipulated
Eif ( this.$el.length ) {
this._postInitialize();
} else {
util.docReady( function () {
// Note the element may not be in the document so must use global jQuery here
self.$el = $( options.el );
self._postInitialize();
} );
}
},
/**
* Called when this.$el is ready.
* @memberof View
* @instance
* @private
*/
_postInitialize: function () {
this.$el.addClass( this.className );
if ( this.isBorderBox ) {
// FIXME: Merge with className property (?)
this.$el.addClass( 'view-border-box' );
}
this.render( this.options );
},
/**
* Function called before the view is rendered. Can be redefined in
* objects that extend View.
* @memberof View
* @instance
*/
preRender: function () {},
/**
* Function called after the view is rendered. Can be redefined in
* objects that extend View.
*
* @memberof View
* @instance
*/
postRender: function () {},
// eslint-disable-next-line valid-jsdoc
/**
* Fill this.$el with template rendered using data if template is set.
*
* @memberof View
* @instance
* @param {Object} data Template data. Will be merged into the view's
* options
* @chainable
*/
render: function ( data ) {
var html;
util.extend( this.options, data );
this.preRender();
this.undelegateEvents();
if ( this.template && !this.options.skipTemplateRender ) {
html = this.template.render( this.options, this.templatePartials );
if ( this.isTemplateMode ) {
this.$el = $( html );
} else {
this.$el.html( html );
}
}
this.postRender();
this.delegateEvents();
return this;
},
/**
* Wraps this.$el.find, so that you can search for elements in the view's
* ($el's) scope.
*
* @memberof View
* @instance
* @param {string} query A jQuery CSS selector.
* @return {JQuery.Object} jQuery object containing results of the search.
*/
$: function ( query ) {
return this.$el.find( query );
},
/**
* Set callbacks, where `this.events` is a hash of
*
* {"event selector": "callback"}
*
* {
* 'mousedown .title': 'edit',
* 'click .button': 'save',
* 'click .open': function(e) { ... }
* }
*
* pairs. Callbacks will be bound to the view, with `this` set properly.
* Uses event delegation for efficiency.
* Omitting the selector binds the event to `this.el`.
*
* @memberof View
* @instance
* @param {Object} events Optionally set this events instead of the ones on this.
*/
delegateEvents: function ( events ) {
var match, key, method;
// Take either the events parameter or the this.events to process
events = events || this.events;
if ( events ) {
// Remove current events before re-binding them
this.undelegateEvents();
for ( key in events ) {
method = events[ key ];
// If the method is a string name of this.method, get it
if ( typeof method !== 'function' ) {
method = this[ events[ key ] ];
}
Eif ( method ) {
// Extract event and selector from the key
match = key.match( delegateEventSplitter );
this.delegate( match[ 1 ], match[ 2 ], method.bind( this ) );
}
}
}
},
/**
* Add a single event listener to the view's element (or a child element
* using `selector`). This only works for delegate-able events: not `focus`,
* `blur`, and not `change`, `submit`, and `reset` in Internet Explorer.
*
* @memberof View
* @instance
* @param {string} eventName
* @param {string} selector
* @param {Function} listener
*/
delegate: function ( eventName, selector, listener ) {
this.$el.on( eventName + '.delegateEvents' + this.cid, selector,
listener );
},
/**
* Clears all callbacks previously bound to the view by `delegateEvents`.
* You usually don't need to use this, but may wish to if you have multiple
* views attached to the same DOM element.
* @memberof View
* @instance
*/
undelegateEvents: function () {
Eif ( this.$el ) {
this.$el.off( '.delegateEvents' + this.cid );
}
},
/**
* A finer-grained `undelegateEvents` for removing a single delegated event.
* `selector` and `listener` are both optional.
*
* @memberof View
* @instance
* @param {string} eventName
* @param {string} selector
* @param {Function} listener
*/
undelegate: function ( eventName, selector, listener ) {
this.$el.off( eventName + '.delegateEvents' + this.cid, selector,
listener );
},
/**
* See parseHTML method of util singleton
*
* @memberof View
* @instance
*/
parseHTML: util.parseHTML
} );
/**
* @memberof View
* @instance
* @func append
* @param {...(string|Node|Node[]|JQuery)} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func append
* @param {function(number, string): string|Node|Node[]|JQuery} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func prepend
* @param {...(string|Node|Node[]|JQuery)} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func prepend
* @param {function(number, string): string|Node|Node[]|JQuery} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func appendTo
* @param {string|Node|Node[]|JQuery} target
* @return {this}
*/
/**
* @memberof View
* @instance
* @func prependTo
* @param {string|Node|Node[]|JQuery} target
* @return {this}
*/
/**
* @memberof View
* @instance
* @func after
* @param {...(string|Node|Node[]|JQuery)} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func after
* @param {function(number, string): string|Node|Node[]|JQuery} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func before
* @param {...(string|Node|Node[]|JQuery)} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func before
* @param {function(number, string): string|Node|Node[]|JQuery} contents
* @return {this}
*/
/**
* @memberof View
* @instance
* @func insertAfter
* @param {string|Node|Node[]|JQuery} target
* @return {this}
*/
/**
* @memberof View
* @instance
* @func insertBefore
* @param {string|Node|Node[]|JQuery} target
* @return {this}
*/
/**
* @memberof View
* @instance
* @func remove
* @param {string} [selector]
* @return {this}
*/
/**
* @memberof View
* @instance
* @func detach
* @param {string} [selector]
* @return {this}
*/
[
'append',
'prepend',
'appendTo',
'prependTo',
'after',
'before',
'insertAfter',
'insertBefore',
'remove',
'detach'
].forEach( function ( prop ) {
View.prototype[prop] = function () {
this.$el[prop].apply( this.$el, arguments );
return this;
};
} );
module.exports = View;
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