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