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1318 alexandre_ 1 
/*
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	Copyright (c) 2004-2006, The Dojo Foundation
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	All Rights Reserved.
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	Licensed under the Academic Free License version 2.1 or above OR the
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	modified BSD license. For more information on Dojo licensing, see:
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		http://dojotoolkit.org/community/licensing.shtml
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*/
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dojo.provide("dojo.selection.Selection");
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dojo.require("dojo.lang.array");
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dojo.require("dojo.lang.func");
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dojo.require("dojo.lang.common");
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dojo.require("dojo.math");
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dojo.declare("dojo.selection.Selection", null, {initializer:function (items, isCollection) {
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	this.items = [];
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	this.selection = [];
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	this._pivotItems = [];
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	this.clearItems();
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	if (items) {
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		if (isCollection) {
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			this.setItemsCollection(items);
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		} else {
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			this.setItems(items);
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		}
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	}
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}, items:null, selection:null, lastSelected:null, allowImplicit:true, length:0, isGrowable:true, _pivotItems:null, _pivotItem:null, onSelect:function (item) {
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}, onDeselect:function (item) {
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}, onSelectChange:function (item, selected) {
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}, _find:function (item, inSelection) {
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	if (inSelection) {
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		return dojo.lang.find(this.selection, item);
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	} else {
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		return dojo.lang.find(this.items, item);
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	}
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}, isSelectable:function (item) {
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	return true;
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}, setItems:function () {
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	this.clearItems();
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	this.addItems.call(this, arguments);
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}, setItemsCollection:function (collection) {
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	this.items = collection;
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}, addItems:function () {
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	var args = dojo.lang.unnest(arguments);
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	for (var i = 0; i < args.length; i++) {
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		this.items.push(args[i]);
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	}
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}, addItemsAt:function (item, before) {
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	if (this.items.length == 0) {
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		return this.addItems(dojo.lang.toArray(arguments, 2));
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	}
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	if (!this.isItem(item)) {
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		item = this.items[item];
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	}
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	if (!item) {
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		throw new Error("addItemsAt: item doesn't exist");
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	}
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	var idx = this._find(item);
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	if (idx > 0 && before) {
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		idx--;
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	}
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	for (var i = 2; i < arguments.length; i++) {
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		if (!this.isItem(arguments[i])) {
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			this.items.splice(idx++, 0, arguments[i]);
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		}
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	}
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}, removeItem:function (item) {
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	var idx = this._find(item);
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	if (idx > -1) {
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		this.items.splice(idx, 1);
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	}
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	idx = this._find(item, true);
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	if (idx > -1) {
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		this.selection.splice(idx, 1);
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	}
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}, clearItems:function () {
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	this.items = [];
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	this.deselectAll();
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}, isItem:function (item) {
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	return this._find(item) > -1;
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}, isSelected:function (item) {
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	return this._find(item, true) > -1;
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}, selectFilter:function (item, selection, add, grow) {
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	return true;
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}, update:function (item, add, grow, noToggle) {
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	if (!this.isItem(item)) {
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		return false;
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	}
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	if (this.isGrowable && grow) {
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		if ((!this.isSelected(item)) && this.selectFilter(item, this.selection, false, true)) {
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			this.grow(item);
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			this.lastSelected = item;
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		}
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	} else {
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		if (add) {
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			if (this.selectFilter(item, this.selection, true, false)) {
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				if (noToggle) {
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					if (this.select(item)) {
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						this.lastSelected = item;
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					}
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				} else {
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					if (this.toggleSelected(item)) {
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						this.lastSelected = item;
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					}
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				}
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			}
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		} else {
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			this.deselectAll();
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			this.select(item);
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		}
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	}
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	this.length = this.selection.length;
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	return true;
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}, grow:function (toItem, fromItem) {
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	if (!this.isGrowable) {
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		return;
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	}
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	if (arguments.length == 1) {
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		fromItem = this._pivotItem;
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		if (!fromItem && this.allowImplicit) {
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			fromItem = this.items[0];
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		}
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	}
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	if (!toItem || !fromItem) {
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		return false;
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	}
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	var fromIdx = this._find(fromItem);
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	var toDeselect = {};
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	var lastIdx = -1;
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	if (this.lastSelected) {
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		lastIdx = this._find(this.lastSelected);
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		var step = fromIdx < lastIdx ? -1 : 1;
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		var range = dojo.math.range(lastIdx, fromIdx, step);
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		for (var i = 0; i < range.length; i++) {
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			toDeselect[range[i]] = true;
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		}
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	}
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	var toIdx = this._find(toItem);
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	var step = fromIdx < toIdx ? -1 : 1;
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	var shrink = lastIdx >= 0 && step == 1 ? lastIdx < toIdx : lastIdx > toIdx;
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	var range = dojo.math.range(toIdx, fromIdx, step);
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	if (range.length) {
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		for (var i = range.length - 1; i >= 0; i--) {
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			var item = this.items[range[i]];
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			if (this.selectFilter(item, this.selection, false, true)) {
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				if (this.select(item, true) || shrink) {
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					this.lastSelected = item;
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				}
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				if (range[i] in toDeselect) {
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					delete toDeselect[range[i]];
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				}
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			}
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		}
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	} else {
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		this.lastSelected = fromItem;
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	}
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	for (var i in toDeselect) {
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		if (this.items[i] == this.lastSelected) {
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		}
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		this.deselect(this.items[i]);
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	}
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	this._updatePivot();
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}, growUp:function () {
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	if (!this.isGrowable) {
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		return;
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	}
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	var idx = this._find(this.lastSelected) - 1;
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	while (idx >= 0) {
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		if (this.selectFilter(this.items[idx], this.selection, false, true)) {
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			this.grow(this.items[idx]);
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			break;
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		}
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		idx--;
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	}
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}, growDown:function () {
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	if (!this.isGrowable) {
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		return;
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	}
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	var idx = this._find(this.lastSelected);
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	if (idx < 0 && this.allowImplicit) {
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		this.select(this.items[0]);
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		idx = 0;
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	}
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	idx++;
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	while (idx > 0 && idx < this.items.length) {
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		if (this.selectFilter(this.items[idx], this.selection, false, true)) {
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			this.grow(this.items[idx]);
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			break;
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		}
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		idx++;
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	}
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}, toggleSelected:function (item, noPivot) {
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	if (this.isItem(item)) {
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		if (this.select(item, noPivot)) {
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			return 1;
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		}
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		if (this.deselect(item)) {
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			return -1;
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		}
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	}
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	return 0;
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}, select:function (item, noPivot) {
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	if (this.isItem(item) && !this.isSelected(item) && this.isSelectable(item)) {
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		this.selection.push(item);
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		this.lastSelected = item;
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		this.onSelect(item);
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		this.onSelectChange(item, true);
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		if (!noPivot) {
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			this._addPivot(item);
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		}
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		this.length = this.selection.length;
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		return true;
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	}
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	return false;
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}, deselect:function (item) {
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	var idx = this._find(item, true);
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	if (idx > -1) {
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		this.selection.splice(idx, 1);
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		this.onDeselect(item);
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		this.onSelectChange(item, false);
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		if (item == this.lastSelected) {
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			this.lastSelected = null;
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		}
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		this._removePivot(item);
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		this.length = this.selection.length;
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		return true;
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	}
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	return false;
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}, selectAll:function () {
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	for (var i = 0; i < this.items.length; i++) {
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		this.select(this.items[i]);
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	}
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}, deselectAll:function () {
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	while (this.selection && this.selection.length) {
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		this.deselect(this.selection[0]);
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	}
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}, selectNext:function () {
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	var idx = this._find(this.lastSelected);
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	while (idx > -1 && ++idx < this.items.length) {
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		if (this.isSelectable(this.items[idx])) {
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			this.deselectAll();
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			this.select(this.items[idx]);
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			return true;
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		}
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	}
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	return false;
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}, selectPrevious:function () {
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	var idx = this._find(this.lastSelected);
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	while (idx-- > 0) {
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		if (this.isSelectable(this.items[idx])) {
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			this.deselectAll();
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			this.select(this.items[idx]);
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			return true;
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		}
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	}
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	return false;
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}, selectFirst:function () {
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	this.deselectAll();
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	var idx = 0;
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	while (this.items[idx] && !this.select(this.items[idx])) {
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		idx++;
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	}
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	return this.items[idx] ? true : false;
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}, selectLast:function () {
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	this.deselectAll();
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	var idx = this.items.length - 1;
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	while (this.items[idx] && !this.select(this.items[idx])) {
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		idx--;
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	}
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	return this.items[idx] ? true : false;
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}, _addPivot:function (item, andClear) {
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	this._pivotItem = item;
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	if (andClear) {
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		this._pivotItems = [item];
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	} else {
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		this._pivotItems.push(item);
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	}
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}, _removePivot:function (item) {
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	var i = dojo.lang.find(this._pivotItems, item);
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	if (i > -1) {
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		this._pivotItems.splice(i, 1);
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		this._pivotItem = this._pivotItems[this._pivotItems.length - 1];
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	}
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	this._updatePivot();
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}, _updatePivot:function () {
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	if (this._pivotItems.length == 0) {
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		if (this.lastSelected) {
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			this._addPivot(this.lastSelected);
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		}
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	}
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}, sorted:function () {
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	return dojo.lang.toArray(this.selection).sort(dojo.lang.hitch(this, function (a, b) {
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		var A = this._find(a), B = this._find(b);
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		if (A > B) {
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			return 1;
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		} else {
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			if (A < B) {
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				return -1;
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			} else {
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				return 0;
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			}
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		}
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	}));
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}, updateSelected:function () {
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	for (var i = 0; i < this.selection.length; i++) {
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		if (this._find(this.selection[i]) < 0) {
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			var removed = this.selection.splice(i, 1);
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			this._removePivot(removed[0]);
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		}
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	}
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	this.length = this.selection.length;
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}});
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