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Viewing changes to static/scripts/ext/src/widgets/grid/AbstractSelectionModel.js

  • Committer: Deng Dongpo
  • Date: 2010-08-01 09:29:44 UTC
  • Revision ID: dongpo@dhcp-21193.iis.sinica.edu.tw-20100801092944-8t9obt4xtl7otesb
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static/scripts/ext/src/widgets/grid/AbstractSelectionModel.js
 
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/*!
 
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 * Ext JS Library 3.2.1
 
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 * Copyright(c) 2006-2010 Ext JS, Inc.
 
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 * licensing@extjs.com
 
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 * http://www.extjs.com/license
 
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 */
 
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/**
 
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 * @class Ext.grid.AbstractSelectionModel
 
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 * @extends Ext.util.Observable
 
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 * Abstract base class for grid SelectionModels.  It provides the interface that should be
 
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 * implemented by descendant classes.  This class should not be directly instantiated.
 
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 * @constructor
 
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 */
 
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Ext.grid.AbstractSelectionModel = Ext.extend(Ext.util.Observable,  {
 
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    /**
 
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     * The GridPanel for which this SelectionModel is handling selection. Read-only.
 
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     * @type Object
 
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     * @property grid
 
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     */
 
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    constructor : function(){
 
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        this.locked = false;
 
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        Ext.grid.AbstractSelectionModel.superclass.constructor.call(this);
 
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    },
 
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    /** @ignore Called by the grid automatically. Do not call directly. */
 
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    init : function(grid){
 
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        this.grid = grid;
 
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        if(this.lockOnInit){
 
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            delete this.lockOnInit;
 
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            this.locked = false;
 
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            this.lock();
 
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        }
 
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        this.initEvents();
 
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    },
 
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    /**
 
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     * Locks the selections.
 
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     */
 
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    lock : function(){
 
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        if(!this.locked){
 
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            this.locked = true;
 
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            // If the grid has been set, then the view is already initialized.
 
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            var g = this.grid;
 
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            if(g){
 
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                g.getView().on({
 
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                    scope: this,
 
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                    beforerefresh: this.sortUnLock,
 
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                    refresh: this.sortLock
 
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                });
 
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            }else{
 
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                this.lockOnInit = true;
 
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            }
 
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        }
 
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    },
 
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    // set the lock states before and after a view refresh
 
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    sortLock : function() {
 
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        this.locked = true;
 
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    },
 
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    // set the lock states before and after a view refresh
 
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    sortUnLock : function() {
 
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        this.locked = false;
 
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    },
 
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    /**
 
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     * Unlocks the selections.
 
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     */
 
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    unlock : function(){
 
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        if(this.locked){
 
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            this.locked = false;
 
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            var g = this.grid,
 
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                gv;
 
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            // If the grid has been set, then the view is already initialized.
 
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            if(g){
 
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                gv = g.getView();
 
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                gv.un('beforerefresh', this.sortUnLock, this);
 
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                gv.un('refresh', this.sortLock, this);    
 
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            }else{
 
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                delete this.lockOnInit;
 
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            }
 
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        }
 
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    },
 
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    /**
 
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     * Returns true if the selections are locked.
 
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     * @return {Boolean}
 
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     */
 
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    isLocked : function(){
 
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        return this.locked;
 
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    },
 
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    destroy: function(){
 
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        this.unlock();
 
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        this.purgeListeners();
 
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    }
 
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});
 
 
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