Rambox-CE/ext/packages/ext-charts/src/chart/MaskLayer.js

/**
 * @private
 */
Ext.define('Ext.chart.MaskLayer', {
    extend: 'Ext.Component',
    
    constructor: function(config) {
        config = Ext.apply(config || {}, {
            style: 'position:absolute;background-color:#ff9;cursor:crosshair;opacity:0.5;border:1px solid #00f;'
        });
        this.callParent([config]);    
    },
    
    //'mousedown',
    //'mouseup',
    //'mousemove',
    //'mouseenter',
    //'mouseleave'

    privates: {
        initDraggable: function() {
            this.callParent(arguments);
            this.dd.onStart = function (e) {
                var me = this,
                    comp = me.comp;

                // Cache the start [X, Y] array
                this.startPosition = comp.getPosition(true);

                // If client Component has a ghost method to show a lightweight version of itself
                // then use that as a drag proxy unless configured to liveDrag.
                if (comp.ghost && !comp.liveDrag) {
                    me.proxy = comp.ghost();
                    me.dragTarget = me.proxy.header.el;
                }

                // Set the constrainTo Region before we start dragging.
                if (me.constrain || me.constrainDelegate) {
                    me.constrainTo = me.calculateConstrainRegion();
                }
            };
        }
    }
});