61 lines
1.6 KiB
JavaScript
61 lines
1.6 KiB
JavaScript
|
var Backbone = require('backbone');
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Stack layout model checks and decides if next or previous
|
||
|
|
* positions are possible.
|
||
|
|
*/
|
||
|
|
|
||
|
|
module.exports = Backbone.Model.extend({
|
||
|
|
|
||
|
|
defaults: {
|
||
|
|
position: 0
|
||
|
|
},
|
||
|
|
|
||
|
|
initialize: function (attrs, opts) {
|
||
|
|
this.stackLayoutItems = opts.stackLayoutItems;
|
||
|
|
},
|
||
|
|
|
||
|
|
goToStep: function (position) {
|
||
|
|
var stackLayoutItemsSize = this.stackLayoutItems.size();
|
||
|
|
|
||
|
|
if (position >= stackLayoutItemsSize) {
|
||
|
|
throw new Error('There is no ' + position + ' stack view in the collection');
|
||
|
|
} else {
|
||
|
|
this.set({
|
||
|
|
position: position
|
||
|
|
}, {
|
||
|
|
silent: true
|
||
|
|
});
|
||
|
|
this._rememberStep.apply(this, arguments);
|
||
|
|
this._triggerPositionChanged(position, Array.prototype.slice.call(arguments, 1));
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
nextStep: function () {
|
||
|
|
var currentPos = this.get('position');
|
||
|
|
var nextPosition = ++currentPos;
|
||
|
|
this.goToStep.apply(this, Array.prototype.concat.apply([nextPosition], arguments));
|
||
|
|
},
|
||
|
|
|
||
|
|
prevStep: function () {
|
||
|
|
var currentPos = this.get('position');
|
||
|
|
var prevPosition = --currentPos;
|
||
|
|
this.goToStep.apply(this, Array.prototype.concat.apply([prevPosition], arguments));
|
||
|
|
},
|
||
|
|
|
||
|
|
goBack: function () {
|
||
|
|
if (this._goBackToArguments) {
|
||
|
|
this.goToStep.apply(this, this._goBackToArguments);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
_triggerPositionChanged: function (position, args) {
|
||
|
|
this.trigger('positionChanged', position, Array.prototype.slice.call(args));
|
||
|
|
},
|
||
|
|
|
||
|
|
_rememberStep: function () {
|
||
|
|
this._goBackToArguments = this._lastStepArguments || [ 0 ];
|
||
|
|
this._lastStepArguments = arguments;
|
||
|
|
}
|
||
|
|
});
|