VulpesOS/gaia/apps/camera/bower_components/view/index.js

(function(define){define(function(require,exports,module){
'use strict';

/**
 * Module Dependencies
 */

var events = require('evt');

/**
 * Locals
 */

var counter = 1;
var noop = function() {};

/**
 * Exports
 */

module.exports = View;

/**
 * Base view class. Accepts
 * or creates a root element
 * which we template into.
 *
 * @constructor
 */
function View(options) {
  options = options || {};
  this.el = options.el || this.el || document.createElement(this.tag);
  this.el.id = this.el.id || ('view' + counter++);
  this.name = options.name || this.name;
  this.els = {};

  if (!this.el.className) {
    if (this.name) this.el.className = this.name;
    if (this.className) this.el.className += ' ' + this.className;
  }

  bindAll(this);
  this.initialize.apply(this, arguments);
}

/**
 * Base view prototype,
 * mixed in event emitter.
 *
 * @type {Object}
 */
events(View.prototype);

// Allow for 'emit' or
// 'fire' to trigger events
View.prototype.fire = View.prototype.fire || View.prototype.emit;

/**
 * Default tagName
 *
 * @type {String}
 */
View.prototype.tag = 'div';
View.prototype.name = 'noname';

/**
 * Appends the root element
 * to the given parent.
 *
 * @param  {Element} parent
 * @return {View}
 */
View.prototype.appendTo = function(parent) {
  if (!parent) return this;
  parent.appendChild(this.el);
  this.fire('inserted');
  return this;
};

/**
 * Prepends the root element
 * to the given parent.
 *
 * @param  {Element} parent
 * @return {View}
 */
View.prototype.prependTo = function(parent) {
  if (!parent) return this;
  var first = parent.firstChild;

  if (first) parent.insertBefore(this.el, first);
  else this.appendTo(parent);

  this.fire('inserted');
  return this;
};

/**
 * Convenient shorthand
 * querySelector.
 *
 * @param  {String} query
 * @return { Element | null}
 */
View.prototype.find = function(query) {
  return this.el.querySelector(query);
};

/**
 * Removes the element from
 * its current DOM location.
 *
 * @param  {Object} options
 * @return {View}
 */
View.prototype.remove = function(options) {
  var silent = options && options.silent;
  var parent = this.el.parentNode;
  if (!parent) return this;
  parent.removeChild(this.el);
  if (!silent) this.fire('remove');
  return this;
};

View.prototype.set = function(key, value) {
  value = value === undefined ? '' : value;
  this.el.setAttribute(toDashed(key), value);
};

View.prototype.get = function(key) {
  return this.el.getAttribute(key);
};

/**
 * Returns a function that when called
 * will .set() the given key.
 *
 * If a value is passed to .setter(),
 * that value will always be used
 * when the returned function is called.
 * Else the value passed to the given
 * function will be used.
 *
 * Example:
 *
 * var setter = this.setter('key', 'value');
 * setter(); //=> this.set('key', 'value');
 * setter('value2'); //=> this.set('key', 'value');
 *
 * var setter = this.setter('key');
 * setter('value'); //=> this.set('key', 'value');
 * setter(); //=> this.set('key');
 *
 * @param  {String} key
 * @param  {*} value
 * @return {Function}
 */
View.prototype.setter = function(key, forced) {
  var self = this;
  return function(passed) {
    var value = forced !== undefined ? forced : passed;
    self.set(key, value);
  };
};

View.prototype.enable = function(key, value) {
  switch(arguments.length) {
    case 0:
      value = true;
      key = 'enabled';
      break;
    case 1:
      if (typeof key === 'boolean') {
        value = key;
        key = 'enabled';
      } else {
        value = true;
        key = key ? key + '-enabled' : 'enabled';
      }
      break;
    default:
      key = key ? key + '-enabled' : 'enabled';
  }
  this.set(key, !!value);
};

View.prototype.disable = function(key) {
  this.enable(key, false);
};

View.prototype.enabler = function(key) {
  return (function(value) { this.enable(key, value); }).bind(this);
};

View.prototype.hide = function(key) {
  this.toggle(key, false);
};

View.prototype.show =  function(key) {
  this.toggle(key, true);
};

View.prototype.toggle = function(key, value) {
  if (arguments.length === 1 && typeof key === 'boolean') {
    value = key;
    key = '';
  } else {
    key = key ? key + '-' : '';
  }

  this.el.classList.toggle(key + 'hidden', !value);
  this.el.classList.toggle(key + 'visible', value);
};

/**
 * Removes the element from
 * it's current context, firing
 * a 'destroy' event to allow
 * views to perform cleanup.
 *
 * Then clears any internal
 * references to aid GC.
 *
 * @return {[type]} [description]
 */
View.prototype.destroy = function(options) {
  var noRemove = options && options.noRemove;
  if (!noRemove) this.remove();
  this.fire('destroy');
  this.el = null;
};

View.prototype.toString = function() {
  return '[object View]';
};

// Overwrite as required
View.prototype.initialize = noop;
View.prototype.template = function() { return ''; };

/**
 * Extends the base view
 * class with the given
 * properties.
 *
 * TODO: Pull this out to
 * standalone module.
 *
 * @param  {Object} properties
 * @return {Function}
 */
View.extend = function(props) {
  var Parent = this;

  // The extended constructor
  // calls the parent constructor
  var Child = function() {
    Parent.apply(this, arguments);
  };

  Child.prototype = Object.create(Parent.prototype);
  Child.extend = View.extend;
  mixin(Child.prototype, props);

  return Child;
};

function toDashed(s) {
  return s.replace(/\W+/g, '-')
    .replace(/([a-z\d])([A-Z])/g, '$1-$2')
    .toLowerCase();
}

function mixin(a, b) {
  for (var key in b) { a[key] = b[key]; }
  return a;
}

function bindAll(object) {
  var key;
  var fn;
  for (key in object) {
    fn = object[key];
    if (typeof fn === 'function') {
      object[key] = fn.bind(object);
    }
  }
}

});})((function(n,w){return typeof define=='function'&&define.amd?
define:typeof module=='object'?function(c){c(require,exports,module);}:function(c){
var m={exports:{}},r=function(n){return w[n];};w[n]=c(r,m.exports,m)||m.exports;};})('view',this));