/*
This file is part of Ext JS 3.4

Copyright (c) 2011-2013 Sencha Inc

Contact:  http://www.sencha.com/contact

GNU General Public License Usage
This file may be used under the terms of the GNU General Public License version 3.0 as
published by the Free Software Foundation and appearing in the file LICENSE included in the
packaging of this file.

Please review the following information to ensure the GNU General Public License version 3.0
requirements will be met: http://www.gnu.org/copyleft/gpl.html.

If you are unsure which license is appropriate for your use, please contact the sales department
at http://www.sencha.com/contact.

Build date: 2013-04-03 15:07:25
*/
/**
 * @class Ext.dd.PanelProxy
 * A custom drag proxy implementation specific to {@link Ext.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} to proxy for
 * @param config Configuration options
 */
Ext.dd.PanelProxy  = Ext.extend(Object, {
    
    constructor : function(panel, config){
        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).
     */
    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;
    },

    /**
     * Gets the proxy's ghost element
     * @return {Element} The proxy's ghost element
     */
    getGhost : function(){
        return this.ghost;
    },

    /**
     * Gets the proxy's element
     * @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;
            }
            this.panel.el.dom.style.display = '';
            this.ghost.remove();
            delete this.ghost;
        }
    },

    /**
     * Shows the proxy
     */
    show : function(){
        if(!this.ghost){
            this.ghost = this.panel.createGhost(this.panel.initialConfig.cls, undefined, Ext.getBody());
            this.ghost.setXY(this.panel.el.getXY());
            if(this.insertProxy){
                this.proxy = this.panel.el.insertSibling({cls:'x-panel-dd-spacer'});
                this.proxy.setSize(this.panel.getSize());
            }
            this.panel.el.dom.style.display = 'none';
        }
    },

    // 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);
        }
    }
});

// private - DD implementation for Panels
Ext.Panel.DD = Ext.extend(Ext.dd.DragSource, {
    
    constructor : function(panel, cfg){
        this.panel = panel;
        this.dragData = {panel: panel};
        this.proxy = new Ext.dd.PanelProxy(panel, cfg);
        Ext.Panel.DD.superclass.constructor.call(this, panel.el, cfg);
        var h = panel.header,
            el = panel.body;
        if(h){
            this.setHandleElId(h.id);
            el = panel.header;
        }
        el.setStyle('cursor', 'move');
        this.scroll = false;        
    },
    
    showFrame: Ext.emptyFn,
    startDrag: Ext.emptyFn,
    b4StartDrag: function(x, y) {
        this.proxy.show();
    },
    b4MouseDown: function(e) {
        var x = e.getPageX(),
            y = e.getPageY();
        this.autoOffset(x, y);
    },
    onInitDrag : function(x, y){
        this.onStartDrag(x, y);
        return true;
    },
    createFrame : Ext.emptyFn,
    getDragEl : function(e){
        return this.proxy.ghost.dom;
    },
    endDrag : function(e){
        this.proxy.hide();
        this.panel.saveState();
    },

    autoOffset : function(x, y) {
        x -= this.startPageX;
        y -= this.startPageY;
        this.setDelta(x, y);
    }
});