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YUI.add('dd-plugin', function (Y, NAME) {
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/**
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* Simple Drag plugin that can be attached to a Node or Widget via the plug method.
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* @module dd
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* @submodule dd-plugin
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*/
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/**
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* Simple Drag plugin that can be attached to a Node or Widget via the plug method.
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* @class Drag
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* @extends DD.Drag
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* @constructor
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* @namespace Plugin
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*/
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var Drag = function(config) {
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if (Y.Widget && config.host instanceof Y.Widget) {
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config.node = config.host.get('boundingBox');
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config.widget = config.host;
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} else {
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config.node = config.host;
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config.widget = false;
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}
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Drag.superclass.constructor.call(this, config);
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},
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EV_START = 'drag:start',
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EV_DRAG = 'drag:drag',
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EV_DRAG_END = 'drag:end';
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/**
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* dd-plugin
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* @property NAME
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* @type {String}
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*/
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Drag.NAME = "dd-plugin";
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/**
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* The Drag instance will be placed on the Node instance under the dd namespace. It can be accessed via Node.dd;
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* @property NS
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* @type {String}
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*/
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Drag.NS = "dd";
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Y.extend(Drag, Y.DD.Drag, {
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_widgetHandles: null,
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/**
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* refers to a Y.Widget if its the host, otherwise = false.
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*
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* @attribute _widget
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* @private
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*/
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_widget: undefined,
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/**
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* refers to the [x,y] coordinate where the drag was stopped last
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*
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* @attribute _stoppedPosition
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* @private
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*/
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_stoppedPosition: undefined,
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/**
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* Returns true if widget uses widgetPosition, otherwise returns false
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*
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* @method _usesWidgetPosition
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* @private
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*/
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_usesWidgetPosition: function(widget) {
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var r = false;
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if (widget) {
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r = (widget.hasImpl && widget.hasImpl(Y.WidgetPosition)) ? true : false;
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}
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return r;
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},
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/**
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* Attached to the `drag:start` event, it checks if this plugin needs
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* to attach or detach listeners for widgets. If `dd-proxy` is plugged
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* the default widget positioning should be ignored.
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* @method _checkEvents
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* @private
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*/
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_checkEvents: function() {
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Y.log('Checking for widget events', 'info', 'dd-plugin');
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if (this._widget) {
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//It's a widget
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if (this.proxy) {
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//It's a proxy
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if (this._widgetHandles.length > 0) {
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Y.log('Proxy is plugged, remove events', 'info', 'dd-plugin');
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//Remove Listeners
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this._removeWidgetListeners();
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}
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} else {
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if (this._widgetHandles.length === 0) {
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Y.log('Proxy is not plugged, attach events', 'info', 'dd-plugin');
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this._attachWidgetListeners();
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}
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}
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}
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},
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/**
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* Remove the attached widget listeners
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* @method _removeWidgetListeners
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* @private
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*/
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_removeWidgetListeners: function() {
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Y.log('Detaching widget events', 'info', 'dd-plugin');
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Y.Array.each(this._widgetHandles, function(handle) {
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handle.detach();
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});
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this._widgetHandles = [];
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},
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/**
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* If this is a Widget, then attach the positioning listeners
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* @method _attachWidgetListeners
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* @private
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*/
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_attachWidgetListeners: function() {
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//if this thing is a widget, and it uses widgetposition...
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if (this._usesWidgetPosition(this._widget)) {
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Y.log('Attaching widget events', 'info', 'dd-plugin');
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//set the x,y on the widget's ATTRS
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this._widgetHandles.push(this.on(EV_DRAG, this._setWidgetCoords));
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//store the new position that the widget ends up on
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this._widgetHandles.push(this.on(EV_DRAG_END, this._updateStopPosition));
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}
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},
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/**
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* Sets up event listeners on drag events if interacting with a widget
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*
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* @method initializer
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* @protected
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*/
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initializer: function(config) {
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this._widgetHandles = [];
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this._widget = config.widget;
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this.on(EV_START, this._checkEvents); //Always run, don't check
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this._attachWidgetListeners();
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},
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/**
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* Updates x,y or xy attributes on widget based on where the widget is dragged
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*
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* @method initializer
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* @param {EventFacade} e Event Facade
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* @private
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*/
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_setWidgetCoords: function(e) {
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//get the last position where the widget was, or get the starting point
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var nodeXY = this._stoppedPosition || e.target.nodeXY,
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realXY = e.target.realXY,
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//amount moved = [(x2 - x1) , (y2 - y1)]
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movedXY = [realXY[0] - nodeXY[0], realXY[1] - nodeXY[1]];
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//if both have changed..
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if (movedXY[0] !== 0 && movedXY[1] !== 0) {
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this._widget.set('xy', realXY);
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}
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//if only x is 0, set the Y
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else if (movedXY[0] === 0) {
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this._widget.set('y',realXY[1]);
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}
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//otherwise, y is 0, so set X
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else if (movedXY[1] === 0){
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this._widget.set('x', realXY[0]);
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}
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},
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/**
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* Updates the last position where the widget was stopped.
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*
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* @method _updateStopPosition
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* @param {EventFacade} e Event Facade
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* @private
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*/
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_updateStopPosition: function(e) {
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this._stoppedPosition = e.target.realXY;
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}
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});
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Y.namespace('Plugin');
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Y.Plugin.Drag = Drag;
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}, '3.18.1', {"optional": ["dd-constrain", "dd-proxy"], "requires": ["dd-drag"]});
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