source: Dev/trunk/src/client/dojo/dnd/Selector.js

define([
        "../_base/array", "../_base/declare", "../_base/kernel", "../_base/lang",
        "../dom", "../dom-construct", "../mouse", "../_base/NodeList", "../on", "../touch", "./common", "./Container"
], function(array, declare, kernel, lang, dom, domConstruct, mouse, NodeList, on, touch, dnd, Container){

// module:
//              dojo/dnd/Selector

/*
        Container item states:
                ""                      - an item is not selected
                "Selected"      - an item is selected
                "Anchor"        - an item is selected, and is an anchor for a "shift" selection
*/

/*=====
var __SelectorArgs = declare([Container.__ContainerArgs], {
        // singular: Boolean
        //              allows selection of only one element, if true
        singular: false,

        // autoSync: Boolean
        //              autosynchronizes the source with its list of DnD nodes,
        autoSync: false
});
=====*/

var Selector = declare("dojo.dnd.Selector", Container, {
        // summary:
        //              a Selector object, which knows how to select its children

        /*=====
        // selection: Set<String>
        //              The set of id's that are currently selected, such that this.selection[id] == 1
        //              if the node w/that id is selected.  Can iterate over selected node's id's like:
        //      |               for(var id in this.selection)
        selection: {},
        =====*/

        constructor: function(node, params){
                // summary:
                //              constructor of the Selector
                // node: Node||String
                //              node or node's id to build the selector on
                // params: __SelectorArgs?
                //              a dictionary of parameters
                if(!params){ params = {}; }
                this.singular = params.singular;
                this.autoSync = params.autoSync;
                // class-specific variables
                this.selection = {};
                this.anchor = null;
                this.simpleSelection = false;
                // set up events
                this.events.push(
                        on(this.node, touch.press, lang.hitch(this, "onMouseDown")),
                        on(this.node, touch.release, lang.hitch(this, "onMouseUp"))
                );
        },

        // object attributes (for markup)
        singular: false,        // is singular property

        // methods
        getSelectedNodes: function(){
                // summary:
                //              returns a list (an array) of selected nodes
                var t = new NodeList();
                var e = dnd._empty;
                for(var i in this.selection){
                        if(i in e){ continue; }
                        t.push(dom.byId(i));
                }
                return t;       // NodeList
        },
        selectNone: function(){
                // summary:
                //              unselects all items
                return this._removeSelection()._removeAnchor(); // self
        },
        selectAll: function(){
                // summary:
                //              selects all items
                this.forInItems(function(data, id){
                        this._addItemClass(dom.byId(id), "Selected");
                        this.selection[id] = 1;
                }, this);
                return this._removeAnchor();    // self
        },
        deleteSelectedNodes: function(){
                // summary:
                //              deletes all selected items
                var e = dnd._empty;
                for(var i in this.selection){
                        if(i in e){ continue; }
                        var n = dom.byId(i);
                        this.delItem(i);
                        domConstruct.destroy(n);
                }
                this.anchor = null;
                this.selection = {};
                return this;    // self
        },
        forInSelectedItems: function(/*Function*/ f, /*Object?*/ o){
                // summary:
                //              iterates over selected items;
                //              see `dojo/dnd/Container.forInItems()` for details
                o = o || kernel.global;
                var s = this.selection, e = dnd._empty;
                for(var i in s){
                        if(i in e){ continue; }
                        f.call(o, this.getItem(i), i, this);
                }
        },
        sync: function(){
                // summary:
                //              sync up the node list with the data map

                Selector.superclass.sync.call(this);

                // fix the anchor
                if(this.anchor){
                        if(!this.getItem(this.anchor.id)){
                                this.anchor = null;
                        }
                }

                // fix the selection
                var t = [], e = dnd._empty;
                for(var i in this.selection){
                        if(i in e){ continue; }
                        if(!this.getItem(i)){
                                t.push(i);
                        }
                }
                array.forEach(t, function(i){
                        delete this.selection[i];
                }, this);

                return this;    // self
        },
        insertNodes: function(addSelected, data, before, anchor){
                // summary:
                //              inserts new data items (see `dojo/dnd/Container.insertNodes()` method for details)
                // addSelected: Boolean
                //              all new nodes will be added to selected items, if true, no selection change otherwise
                // data: Array
                //              a list of data items, which should be processed by the creator function
                // before: Boolean
                //              insert before the anchor, if true, and after the anchor otherwise
                // anchor: Node
                //              the anchor node to be used as a point of insertion
                var oldCreator = this._normalizedCreator;
                this._normalizedCreator = function(item, hint){
                        var t = oldCreator.call(this, item, hint);
                        if(addSelected){
                                if(!this.anchor){
                                        this.anchor = t.node;
                                        this._removeItemClass(t.node, "Selected");
                                        this._addItemClass(this.anchor, "Anchor");
                                }else if(this.anchor != t.node){
                                        this._removeItemClass(t.node, "Anchor");
                                        this._addItemClass(t.node, "Selected");
                                }
                                this.selection[t.node.id] = 1;
                        }else{
                                this._removeItemClass(t.node, "Selected");
                                this._removeItemClass(t.node, "Anchor");
                        }
                        return t;
                };
                Selector.superclass.insertNodes.call(this, data, before, anchor);
                this._normalizedCreator = oldCreator;
                return this;    // self
        },
        destroy: function(){
                // summary:
                //              prepares the object to be garbage-collected
                Selector.superclass.destroy.call(this);
                this.selection = this.anchor = null;
        },

        // mouse events
        onMouseDown: function(e){
                // summary:
                //              event processor for onmousedown
                // e: Event
                //              mouse event
                if(this.autoSync){ this.sync(); }
                if(!this.current){ return; }
                if(!this.singular && !dnd.getCopyKeyState(e) && !e.shiftKey && (this.current.id in this.selection)){
                        this.simpleSelection = true;
                        if(mouse.isLeft(e)){
                                // Accept the left button and stop the event.   Stopping the event prevents text selection while
                                // dragging.   However, don't stop the event on mobile because that prevents a click event,
                                // and also prevents scroll (see #15838).
                                // For IE we don't stop event when multiple buttons are pressed.
                                e.stopPropagation();
                                e.preventDefault();
                        }
                        return;
                }
                if(!this.singular && e.shiftKey){
                        if(!dnd.getCopyKeyState(e)){
                                this._removeSelection();
                        }
                        var c = this.getAllNodes();
                        if(c.length){
                                if(!this.anchor){
                                        this.anchor = c[0];
                                        this._addItemClass(this.anchor, "Anchor");
                                }
                                this.selection[this.anchor.id] = 1;
                                if(this.anchor != this.current){
                                        var i = 0, node;
                                        for(; i < c.length; ++i){
                                                node = c[i];
                                                if(node == this.anchor || node == this.current){ break; }
                                        }
                                        for(++i; i < c.length; ++i){
                                                node = c[i];
                                                if(node == this.anchor || node == this.current){ break; }
                                                this._addItemClass(node, "Selected");
                                                this.selection[node.id] = 1;
                                        }
                                        this._addItemClass(this.current, "Selected");
                                        this.selection[this.current.id] = 1;
                                }
                        }
                }else{
                        if(this.singular){
                                if(this.anchor == this.current){
                                        if(dnd.getCopyKeyState(e)){
                                                this.selectNone();
                                        }
                                }else{
                                        this.selectNone();
                                        this.anchor = this.current;
                                        this._addItemClass(this.anchor, "Anchor");
                                        this.selection[this.current.id] = 1;
                                }
                        }else{
                                if(dnd.getCopyKeyState(e)){
                                        if(this.anchor == this.current){
                                                delete this.selection[this.anchor.id];
                                                this._removeAnchor();
                                        }else{
                                                if(this.current.id in this.selection){
                                                        this._removeItemClass(this.current, "Selected");
                                                        delete this.selection[this.current.id];
                                                }else{
                                                        if(this.anchor){
                                                                this._removeItemClass(this.anchor, "Anchor");
                                                                this._addItemClass(this.anchor, "Selected");
                                                        }
                                                        this.anchor = this.current;
                                                        this._addItemClass(this.current, "Anchor");
                                                        this.selection[this.current.id] = 1;
                                                }
                                        }
                                }else{
                                        if(!(this.current.id in this.selection)){
                                                this.selectNone();
                                                this.anchor = this.current;
                                                this._addItemClass(this.current, "Anchor");
                                                this.selection[this.current.id] = 1;
                                        }
                                }
                        }
                }
                e.stopPropagation();
                e.preventDefault();
        },
        onMouseUp: function(/*===== e =====*/){
                // summary:
                //              event processor for onmouseup
                // e: Event
                //              mouse event
                if(!this.simpleSelection){ return; }
                this.simpleSelection = false;
                this.selectNone();
                if(this.current){
                        this.anchor = this.current;
                        this._addItemClass(this.anchor, "Anchor");
                        this.selection[this.current.id] = 1;
                }
        },
        onMouseMove: function(/*===== e =====*/){
                // summary:
                //              event processor for onmousemove
                // e: Event
                //              mouse event
                this.simpleSelection = false;
        },

        // utilities
        onOverEvent: function(){
                // summary:
                //              this function is called once, when mouse is over our container
                this.onmousemoveEvent = on(this.node, touch.move, lang.hitch(this, "onMouseMove"));
        },
        onOutEvent: function(){
                // summary:
                //              this function is called once, when mouse is out of our container
                if(this.onmousemoveEvent){
                        this.onmousemoveEvent.remove();
                        delete this.onmousemoveEvent;
                }
        },
        _removeSelection: function(){
                // summary:
                //              unselects all items
                var e = dnd._empty;
                for(var i in this.selection){
                        if(i in e){ continue; }
                        var node = dom.byId(i);
                        if(node){ this._removeItemClass(node, "Selected"); }
                }
                this.selection = {};
                return this;    // self
        },
        _removeAnchor: function(){
                if(this.anchor){
                        this._removeItemClass(this.anchor, "Anchor");
                        this.anchor = null;
                }
                return this;    // self
        }
});

return Selector;

});