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//>>built
define("dojox/grid/_SelectionPreserver", [
"dojo/_base/declare",
"dojo/_base/connect",
"dojo/_base/lang",
"dojo/_base/array"
], function(declare, connect, lang, array){
return declare("dojox.grid._SelectionPreserver", null, {
// summary:
// Preserve selections across various user actions.
//
// description:
// When this feature is turned on, Grid will try to preserve selections across actions, e.g. sorting, filtering etc.
//
// Precondition - Identifier(id) is required for store since id is the only way for differentiating row items.
// Known issue - The preserved selections might be inaccurate if some unloaded rows are previously selected by range(e.g.SHIFT + click)
//
// example:
// | //To turn on this - please set 'keepSelection' attribute to true
// | <div dojoType="dojox.grid.DataGrid" keepSelection = true .../>
// | <div dojoType="dojox.grid.TreeGrid" keepSelection = true .../>
// | <div dojoType="dojox.grid.LazyTreeGrid" keepSelection = true .../>
constructor: function(selection){
this.selection = selection;
var grid = this.grid = selection.grid;
this.reset();
this._connects = [
connect.connect(grid, '_setStore', this, 'reset'),
connect.connect(grid, '_addItem', this, '_reSelectById'),
connect.connect(selection, 'addToSelection', lang.hitch(this, '_selectById', true)),
connect.connect(selection, 'deselect', lang.hitch(this, '_selectById', false)),
connect.connect(selection, 'deselectAll', this, 'reset')
];
},
destroy: function(){
this.reset();
array.forEach(this._connects, connect.disconnect);
delete this._connects;
},
reset: function(){
this._selectedById = {};
},
_reSelectById: function(item, index){
// summary:
// When some rows is fetched, determine whether it should be selected.
if(item && this.grid._hasIdentity){
this.selection.selected[index] = this._selectedById[this.grid.store.getIdentity(item)];
}
},
_selectById: function(toSelect, inItemOrIndex){
// summary:
// Record selected rows by ID.
if(this.selection.mode == 'none' || !this.grid._hasIdentity){ return; }
var item = inItemOrIndex, g = this.grid;
if(typeof inItemOrIndex == "number" || typeof inItemOrIndex == "string"){
var entry = g._by_idx[inItemOrIndex];
item = entry && entry.item;
}
if(item){
this._selectedById[g.store.getIdentity(item)] = !!toSelect;
}
return item;
}
});
});
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