pagination_support.js

var get = Ember.get;

/**
  @extends Ember.Mixin

  Implements common pagination management properties for controllers.
*/
Ember.PaginationSupport = Ember.Mixin.create({
  /**
   */
  total: 0,

  /**
   */
  rangeStart: 0,

  /**
   */
  rangeWindowSize: 10,

  /**
   */
  rangeStop: Ember.computed('total', 'rangeStart', 'rangeWindowSize', function() {
    var rangeStop = get(this, 'rangeStart') + get(this, 'rangeWindowSize'),
    total = get(this, 'total');
    if (rangeStop < total) {
      return rangeStop;
    }
    return total;
  }).cacheable(),

  /**
   */
  page: Ember.computed('rangeStart', 'rangeWindowSize', function() {
    return (get(this, 'rangeStart') / get(this, 'rangeWindowSize')) + 1;
  }).cacheable(),

  /**
   */
  totalPages: Ember.computed('total', 'rangeWindowSize', function() {
    return Math.ceil(get(this, 'total') / get(this, 'rangeWindowSize'));
  }).cacheable(),

  /**
   */
  hasPrevious: Ember.computed('rangeStart', function() {
    return get(this, 'rangeStart') > 0;
  }).cacheable(),

  /**
   */
  hasNext: Ember.computed('rangeStop', 'total', function() {
    return get(this, 'rangeStop') < get(this, 'total');
  }).cacheable(),

  /**
  */
  didRequestRange: Ember.K,

  /**
   */
  nextPage: function() {
    if (get(this, 'hasNext')) {
      this.incrementProperty('rangeStart', get(this, 'rangeWindowSize'));
    }
  },

  /**
   */
  previousPage: function() {
    if (get(this, 'hasPrevious')) {
      this.decrementProperty('rangeStart', get(this, 'rangeWindowSize'));
    }
  },

  rangeDidChange: Ember.observer(function() {
    this.didRequestRange(get(this, 'rangeStart'), get(this, 'rangeStop'));
  }, 'rangeStart', 'rangeStop')
});