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  <pre class="prettyprint lang-js"><span id='Ext-grid-AbstractSelectionModel-method-constructor'><span id='Ext-grid-AbstractSelectionModel'>/**
</span></span> * @class Ext.grid.AbstractSelectionModel
 * @extends Ext.util.Observable
 * Abstract base class for grid SelectionModels.  It provides the interface that should be
 * implemented by descendant classes.  This class should not be directly instantiated.
 * @constructor
 */
Ext.grid.AbstractSelectionModel = Ext.extend(Ext.util.Observable,  {
<span id='Ext-grid-AbstractSelectionModel-property-grid'>    /**
</span>     * The GridPanel for which this SelectionModel is handling selection. Read-only.
     * @type Object
     * @property grid
     */

    constructor : function(){
        this.locked = false;
        Ext.grid.AbstractSelectionModel.superclass.constructor.call(this);
    },

<span id='global-method-init'>    /** @ignore Called by the grid automatically. Do not call directly. */
</span>    init : function(grid){
        this.grid = grid;
        if(this.lockOnInit){
            delete this.lockOnInit;
            this.locked = false;
            this.lock();
        }
        this.initEvents();
    },

<span id='Ext-grid-AbstractSelectionModel-method-lock'>    /**
</span>     * Locks the selections.
     */
    lock : function(){
        if(!this.locked){
            this.locked = true;
            // If the grid has been set, then the view is already initialized.
            var g = this.grid;
            if(g){
                g.getView().on({
                    scope: this,
                    beforerefresh: this.sortUnLock,
                    refresh: this.sortLock
                });
            }else{
                this.lockOnInit = true;
            }



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