source: Dev/trunk/src/client/dojox/grid/Selection.js

define([
        "dojo/_base/declare",
        "dojo/_base/array",
        "dojo/_base/lang",
        "dojo/dom-attr"
], function(declare, array, lang, domAttr){

return declare("dojox.grid.Selection", null, {
        // summary:
        //              Manages row selection for grid. Owned by grid and used internally
        //              for selection. Override to implement custom selection.

        constructor: function(inGrid){
                this.grid = inGrid;
                this.selected = [];

                this.setMode(inGrid.selectionMode);
        },

        mode: 'extended',

        selected: null,
        updating: 0,
        selectedIndex: -1,
        rangeStartIndex: -1,

        setMode: function(mode){
                if(this.selected.length){
                        this.deselectAll();
                }
                if(mode != 'extended' && mode != 'multiple' && mode != 'single' && mode != 'none'){
                        this.mode = 'extended';
                }else{
                        this.mode = mode;
                }
        },

        onCanSelect: function(inIndex){
                return this.grid.onCanSelect(inIndex);
        },

        onCanDeselect: function(inIndex){
                return this.grid.onCanDeselect(inIndex);
        },

        onSelected: function(inIndex){
        },

        onDeselected: function(inIndex){
        },

        //onSetSelected: function(inIndex, inSelect) { };
        onChanging: function(){
        },

        onChanged: function(){
        },

        isSelected: function(inIndex){
                if(this.mode == 'none'){
                        return false;
                }
                return this.selected[inIndex];
        },

        getFirstSelected: function(){
                if(!this.selected.length||this.mode == 'none'){ return -1; }
                for(var i=0, l=this.selected.length; i<l; i++){
                        if(this.selected[i]){
                                return i;
                        }
                }
                return -1;
        },

        getNextSelected: function(inPrev){
                if(this.mode == 'none'){ return -1; }
                for(var i=inPrev+1, l=this.selected.length; i<l; i++){
                        if(this.selected[i]){
                                return i;
                        }
                }
                return -1;
        },

        getSelected: function(){
                var result = [];
                for(var i=0, l=this.selected.length; i<l; i++){
                        if(this.selected[i]){
                                result.push(i);
                        }
                }
                return result;
        },

        getSelectedCount: function(){
                var c = 0;
                for(var i=0; i<this.selected.length; i++){
                        if(this.selected[i]){
                                c++;
                        }
                }
                return c;
        },

        _beginUpdate: function(){
                if(this.updating === 0){
                        this.onChanging();
                }
                this.updating++;
        },

        _endUpdate: function(){
                this.updating--;
                if(this.updating === 0){
                        this.onChanged();
                }
        },

        select: function(inIndex){
                if(this.mode == 'none'){ return; }
                if(this.mode != 'multiple'){
                        this.deselectAll(inIndex);
                        this.addToSelection(inIndex);
                }else{
                        this.toggleSelect(inIndex);
                }
        },

        addToSelection: function(inIndex){
                if(this.mode == 'none'){ return; }
                if(lang.isArray(inIndex)){
                        array.forEach(inIndex, this.addToSelection, this);
                        return;
                }
                inIndex = Number(inIndex);
                if(this.selected[inIndex]){
                        this.selectedIndex = inIndex;
                }else{
                        if(this.onCanSelect(inIndex) !== false){
                                this.selectedIndex = inIndex;
                                var rowNode = this.grid.getRowNode(inIndex);
                                if(rowNode){
                                        domAttr.set(rowNode, "aria-selected", "true");
                                }
                                this._beginUpdate();
                                this.selected[inIndex] = true;
                                //this.grid.onSelected(inIndex);
                                this.onSelected(inIndex);
                                //this.onSetSelected(inIndex, true);
                                this._endUpdate();
                        }
                }
        },

        deselect: function(inIndex){
                if(this.mode == 'none'){ return; }
                if(lang.isArray(inIndex)){
                        array.forEach(inIndex, this.deselect, this);
                        return;
                }
                inIndex = Number(inIndex);
                if(this.selectedIndex == inIndex){
                        this.selectedIndex = -1;
                }
                if(this.selected[inIndex]){
                        if(this.onCanDeselect(inIndex) === false){
                                return;
                        }
                        var rowNode = this.grid.getRowNode(inIndex);
                        if(rowNode){
                                domAttr.set(rowNode, "aria-selected", "false");
                        }
                        this._beginUpdate();
                        delete this.selected[inIndex];
                        //this.grid.onDeselected(inIndex);
                        this.onDeselected(inIndex);
                        //this.onSetSelected(inIndex, false);
                        this._endUpdate();
                }
        },

        setSelected: function(inIndex, inSelect){
                this[(inSelect ? 'addToSelection' : 'deselect')](inIndex);
        },

        toggleSelect: function(inIndex){
                if(lang.isArray(inIndex)){
                        array.forEach(inIndex, this.toggleSelect, this);
                        return;
                }
                this.setSelected(inIndex, !this.selected[inIndex]);
        },

        _range: function(inFrom, inTo, func){
                var s = (inFrom >= 0 ? inFrom : inTo), e = inTo;
                if(s > e){
                        e = s;
                        s = inTo;
                }
                for(var i=s; i<=e; i++){
                        func(i);
                }
        },

        selectRange: function(inFrom, inTo){
                this._range(inFrom, inTo, lang.hitch(this, "addToSelection"));
        },

        deselectRange: function(inFrom, inTo){
                this._range(inFrom, inTo, lang.hitch(this, "deselect"));
        },

        insert: function(inIndex){
                this.selected.splice(inIndex, 0, false);
                if(this.selectedIndex >= inIndex){
                        this.selectedIndex++;
                }
        },

        remove: function(inIndex){
                this.selected.splice(inIndex, 1);
                if(this.selectedIndex >= inIndex){
                        this.selectedIndex--;
                }
        },

        deselectAll: function(inExcept){
                for(var i in this.selected){
                        if((i!=inExcept)&&(this.selected[i]===true)){
                                this.deselect(i);
                        }
                }
        },

        clickSelect: function(inIndex, inCtrlKey, inShiftKey){
                if(this.mode == 'none'){ return; }
                this._beginUpdate();
                if(this.mode != 'extended'){
                        this.select(inIndex);
                }else{
                        if(!inShiftKey || this.rangeStartIndex < 0){
                                this.rangeStartIndex = inIndex;
                        }
                        if(!inCtrlKey){
                                this.deselectAll(inIndex);
                        }
                        if(inShiftKey){
                                this.selectRange(this.rangeStartIndex, inIndex);
                        }else if(inCtrlKey){
                                this.toggleSelect(inIndex);
                        }else{
                                this.addToSelection(inIndex);
                        }
                }
                this._endUpdate();
        },

        clickSelectEvent: function(e){
                this.clickSelect(e.rowIndex, dojo.isCopyKey(e), e.shiftKey);
        },

        clear: function(){
                this._beginUpdate();
                this.deselectAll();
                this._endUpdate();
        }
});
});