File: web/bundles/extjs/src/draw/SpriteDD.js

/*
This file is part of Ext JS 4.2

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: 2013-05-16 14:36:50 (f9be68accb407158ba2b1be2c226a6ce1f649314)
*/
/**
 * DD implementation for Panels.
 * @private
 */
Ext.define('Ext.draw.SpriteDD', {
    extend: 'Ext.dd.DragSource',

    constructor : function(sprite, cfg){
        var me = this,
            el = sprite.el;
        me.sprite = sprite;
        me.el = el;
        me.dragData = {el: el, sprite: sprite};
        me.callParent([el, cfg]);
        me.sprite.setStyle('cursor', 'move');
    },

    showFrame: Ext.emptyFn,
    createFrame : Ext.emptyFn,

    getDragEl : function(e){
        return this.el;
    },
    
    getRegion: function() {
        var me = this,
            el = me.el,
            pos, x1, x2, y1, y2, t, r, b, l, bbox, sprite;
        
        sprite = me.sprite;
        bbox = sprite.getBBox();
        
        try {
            pos = Ext.Element.getXY(el);
        } catch (e) { }

        if (!pos) {
            return null;
        }

        x1 = pos[0];
        x2 = x1 + bbox.width;
        y1 = pos[1];
        y2 = y1 + bbox.height;
        
        return new Ext.util.Region(y1, x2, y2, x1);
    },

    /*
      TODO(nico): Cumulative translations in VML are handled
      differently than in SVG. While in SVG we specify the translation
      relative to the original x, y position attributes, in VML the translation
      is a delta between the last position of the object (modified by the last
      translation) and the new one.
      
      In VML the translation alters the position
      of the object, we should change that or alter the SVG impl.
    */
     
    startDrag: function(x, y) {
        var me = this,
            attr = me.sprite.attr;
        me.prev = me.sprite.surface.transformToViewBox(x, y);
    },

    onDrag: function(e) {
        var xy = e.getXY(),
            me = this,
            sprite = me.sprite,
            attr = sprite.attr, dx, dy;
        xy = me.sprite.surface.transformToViewBox(xy[0], xy[1]);
        dx = xy[0] - me.prev[0];
        dy = xy[1] - me.prev[1];
        sprite.setAttributes({
            translate: {
                x: attr.translation.x + dx,
                y: attr.translation.y + dy
            }
        }, true);
        me.prev = xy;
    },

    setDragElPos: function () {
        // Disable automatic DOM move in DD that spoils layout of VML engine.
        return false;
    }
});