/**
+ * @class Ext.panel.Proxy
+ * @extends Object
+ * A custom drag proxy implementation specific to {@link Ext.panel.Panel}s. This class
+ * is primarily used internally for the Panel's drag drop implementation, and
+ * should never need to be created directly.
+ * @constructor
+ * @param panel The {@link Ext.panel.Panel} to proxy for
+ * @param config Configuration options
+ */
+Ext.define('Ext.panel.Proxy', {
+
+ alternateClassName: 'Ext.dd.PanelProxy',
+
+ constructor: function(panel, config){
+ /**
+ * @property panel
+ * @type Ext.panel.Panel
+ */
+ this.panel = panel;
+ this.id = this.panel.id +'-ddproxy';
+ Ext.apply(this, config);
+ },
+
+ /**
+ * @cfg {Boolean} insertProxy True to insert a placeholder proxy element
+ * while dragging the panel, false to drag with no proxy (defaults to true).
+ * Most Panels are not absolute positioned and therefore we need to reserve
+ * this space.
+ */
+ insertProxy: true,
+
+ // private overrides
+ setStatus: Ext.emptyFn,
+ reset: Ext.emptyFn,
+ update: Ext.emptyFn,
+ stop: Ext.emptyFn,
+ sync: Ext.emptyFn,
+
+ /**
+ * Gets the proxy's element
+ * @return {Element} The proxy's element
+ */
+ getEl: function(){
+ return this.ghost.el;
+ },
+
+ /**
+ * Gets the proxy's ghost Panel
+ * @return {Panel} The proxy's ghost Panel
+ */
+ getGhost: function(){
+ return this.ghost;
+ },
+
+ /**
+ * Gets the proxy element. This is the element that represents where the
+ * Panel was before we started the drag operation.
+ * @return {Element} The proxy's element
+ */
+ getProxy: function(){
+ return this.proxy;
+ },
+
+ /**
+ * Hides the proxy
+ */
+ hide : function(){
+ if (this.ghost) {
+ if (this.proxy) {
+ this.proxy.remove();
+ delete this.proxy;
+ }
+
+ // Unghost the Panel, do not move the Panel to where the ghost was
+ this.panel.unghost(null, false);
+ delete this.ghost;
+ }
+ },
+
+ /**
+ * Shows the proxy
+ */
+ show: function(){
+ if (!this.ghost) {
+ var panelSize = this.panel.getSize();
+ this.panel.el.setVisibilityMode(Ext.core.Element.DISPLAY);
+ this.ghost = this.panel.ghost();
+ if (this.insertProxy) {
+ // bc Panels aren't absolute positioned we need to take up the space
+ // of where the panel previously was
+ this.proxy = this.panel.el.insertSibling({cls: Ext.baseCSSPrefix + 'panel-dd-spacer'});
+ this.proxy.setSize(panelSize);
+ }
+ }
+ },
+
+ // private
+ repair: function(xy, callback, scope) {
+ this.hide();
+ if (typeof callback == "function") {
+ callback.call(scope || this);
+ }
+ },
+
+ /**
+ * Moves the proxy to a different position in the DOM. This is typically
+ * called while dragging the Panel to keep the proxy sync'd to the Panel's
+ * location.
+ * @param {HTMLElement} parentNode The proxy's parent DOM node
+ * @param {HTMLElement} before (optional) The sibling node before which the
+ * proxy should be inserted (defaults to the parent's last child if not
+ * specified)
+ */
+ moveProxy : function(parentNode, before){
+ if (this.proxy) {
+ parentNode.insertBefore(this.proxy.dom, before);
+ }
+ }
+});