Struts example source code file (Selection.js)

This example Struts source code file (Selection.js) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

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The Struts Selection.js source code

/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/



dojo.provide("dojo.selection.Selection");
dojo.require("dojo.lang.array");
dojo.require("dojo.lang.func");
dojo.require("dojo.lang.common");
dojo.require("dojo.math");
dojo.declare("dojo.selection.Selection", null, {initializer:function (items, isCollection) {
	this.items = [];
	this.selection = [];
	this._pivotItems = [];
	this.clearItems();
	if (items) {
		if (isCollection) {
			this.setItemsCollection(items);
		} else {
			this.setItems(items);
		}
	}
}, items:null, selection:null, lastSelected:null, allowImplicit:true, length:0, isGrowable:true, _pivotItems:null, _pivotItem:null, onSelect:function (item) {
}, onDeselect:function (item) {
}, onSelectChange:function (item, selected) {
}, _find:function (item, inSelection) {
	if (inSelection) {
		return dojo.lang.find(this.selection, item);
	} else {
		return dojo.lang.find(this.items, item);
	}
}, isSelectable:function (item) {
	return true;
}, setItems:function () {
	this.clearItems();
	this.addItems.call(this, arguments);
}, setItemsCollection:function (collection) {
	this.items = collection;
}, addItems:function () {
	var args = dojo.lang.unnest(arguments);
	for (var i = 0; i < args.length; i++) {
		this.items.push(args[i]);
	}
}, addItemsAt:function (item, before) {
	if (this.items.length == 0) {
		return this.addItems(dojo.lang.toArray(arguments, 2));
	}
	if (!this.isItem(item)) {
		item = this.items[item];
	}
	if (!item) {
		throw new Error("addItemsAt: item doesn't exist");
	}
	var idx = this._find(item);
	if (idx > 0 && before) {
		idx--;
	}
	for (var i = 2; i < arguments.length; i++) {
		if (!this.isItem(arguments[i])) {
			this.items.splice(idx++, 0, arguments[i]);
		}
	}
}, removeItem:function (item) {
	var idx = this._find(item);
	if (idx > -1) {
		this.items.splice(idx, 1);
	}
	idx = this._find(item, true);
	if (idx > -1) {
		this.selection.splice(idx, 1);
	}
}, clearItems:function () {
	this.items = [];
	this.deselectAll();
}, isItem:function (item) {
	return this._find(item) > -1;
}, isSelected:function (item) {
	return this._find(item, true) > -1;
}, selectFilter:function (item, selection, add, grow) {
	return true;
}, update:function (item, add, grow, noToggle) {
	if (!this.isItem(item)) {
		return false;
	}
	if (this.isGrowable && grow) {
		if ((!this.isSelected(item)) && this.selectFilter(item, this.selection, false, true)) {
			this.grow(item);
			this.lastSelected = item;
		}
	} else {
		if (add) {
			if (this.selectFilter(item, this.selection, true, false)) {
				if (noToggle) {
					if (this.select(item)) {
						this.lastSelected = item;
					}
				} else {
					if (this.toggleSelected(item)) {
						this.lastSelected = item;
					}
				}
			}
		} else {
			this.deselectAll();
			this.select(item);
		}
	}
	this.length = this.selection.length;
	return true;
}, grow:function (toItem, fromItem) {
	if (!this.isGrowable) {
		return;
	}
	if (arguments.length == 1) {
		fromItem = this._pivotItem;
		if (!fromItem && this.allowImplicit) {
			fromItem = this.items[0];
		}
	}
	if (!toItem || !fromItem) {
		return false;
	}
	var fromIdx = this._find(fromItem);
	var toDeselect = {};
	var lastIdx = -1;
	if (this.lastSelected) {
		lastIdx = this._find(this.lastSelected);
		var step = fromIdx < lastIdx ? -1 : 1;
		var range = dojo.math.range(lastIdx, fromIdx, step);
		for (var i = 0; i < range.length; i++) {
			toDeselect[range[i]] = true;
		}
	}
	var toIdx = this._find(toItem);
	var step = fromIdx < toIdx ? -1 : 1;
	var shrink = lastIdx >= 0 && step == 1 ? lastIdx < toIdx : lastIdx > toIdx;
	var range = dojo.math.range(toIdx, fromIdx, step);
	if (range.length) {
		for (var i = range.length - 1; i >= 0; i--) {
			var item = this.items[range[i]];
			if (this.selectFilter(item, this.selection, false, true)) {
				if (this.select(item, true) || shrink) {
					this.lastSelected = item;
				}
				if (range[i] in toDeselect) {
					delete toDeselect[range[i]];
				}
			}
		}
	} else {
		this.lastSelected = fromItem;
	}
	for (var i in toDeselect) {
		if (this.items[i] == this.lastSelected) {
		}
		this.deselect(this.items[i]);
	}
	this._updatePivot();
}, growUp:function () {
	if (!this.isGrowable) {
		return;
	}
	var idx = this._find(this.lastSelected) - 1;
	while (idx >= 0) {
		if (this.selectFilter(this.items[idx], this.selection, false, true)) {
			this.grow(this.items[idx]);
			break;
		}
		idx--;
	}
}, growDown:function () {
	if (!this.isGrowable) {
		return;
	}
	var idx = this._find(this.lastSelected);
	if (idx < 0 && this.allowImplicit) {
		this.select(this.items[0]);
		idx = 0;
	}
	idx++;
	while (idx > 0 && idx < this.items.length) {
		if (this.selectFilter(this.items[idx], this.selection, false, true)) {
			this.grow(this.items[idx]);
			break;
		}
		idx++;
	}
}, toggleSelected:function (item, noPivot) {
	if (this.isItem(item)) {
		if (this.select(item, noPivot)) {
			return 1;
		}
		if (this.deselect(item)) {
			return -1;
		}
	}
	return 0;
}, select:function (item, noPivot) {
	if (this.isItem(item) && !this.isSelected(item) && this.isSelectable(item)) {
		this.selection.push(item);
		this.lastSelected = item;
		this.onSelect(item);
		this.onSelectChange(item, true);
		if (!noPivot) {
			this._addPivot(item);
		}
		this.length = this.selection.length;
		return true;
	}
	return false;
}, deselect:function (item) {
	var idx = this._find(item, true);
	if (idx > -1) {
		this.selection.splice(idx, 1);
		this.onDeselect(item);
		this.onSelectChange(item, false);
		if (item == this.lastSelected) {
			this.lastSelected = null;
		}
		this._removePivot(item);
		this.length = this.selection.length;
		return true;
	}
	return false;
}, selectAll:function () {
	for (var i = 0; i < this.items.length; i++) {
		this.select(this.items[i]);
	}
}, deselectAll:function () {
	while (this.selection && this.selection.length) {
		this.deselect(this.selection[0]);
	}
}, selectNext:function () {
	var idx = this._find(this.lastSelected);
	while (idx > -1 && ++idx < this.items.length) {
		if (this.isSelectable(this.items[idx])) {
			this.deselectAll();
			this.select(this.items[idx]);
			return true;
		}
	}
	return false;
}, selectPrevious:function () {
	var idx = this._find(this.lastSelected);
	while (idx-- > 0) {
		if (this.isSelectable(this.items[idx])) {
			this.deselectAll();
			this.select(this.items[idx]);
			return true;
		}
	}
	return false;
}, selectFirst:function () {
	this.deselectAll();
	var idx = 0;
	while (this.items[idx] && !this.select(this.items[idx])) {
		idx++;
	}
	return this.items[idx] ? true : false;
}, selectLast:function () {
	this.deselectAll();
	var idx = this.items.length - 1;
	while (this.items[idx] && !this.select(this.items[idx])) {
		idx--;
	}
	return this.items[idx] ? true : false;
}, _addPivot:function (item, andClear) {
	this._pivotItem = item;
	if (andClear) {
		this._pivotItems = [item];
	} else {
		this._pivotItems.push(item);
	}
}, _removePivot:function (item) {
	var i = dojo.lang.find(this._pivotItems, item);
	if (i > -1) {
		this._pivotItems.splice(i, 1);
		this._pivotItem = this._pivotItems[this._pivotItems.length - 1];
	}
	this._updatePivot();
}, _updatePivot:function () {
	if (this._pivotItems.length == 0) {
		if (this.lastSelected) {
			this._addPivot(this.lastSelected);
		}
	}
}, sorted:function () {
	return dojo.lang.toArray(this.selection).sort(dojo.lang.hitch(this, function (a, b) {
		var A = this._find(a), B = this._find(b);
		if (A > B) {
			return 1;
		} else {
			if (A < B) {
				return -1;
			} else {
				return 0;
			}
		}
	}));
}, updateSelected:function () {
	for (var i = 0; i < this.selection.length; i++) {
		if (this._find(this.selection[i]) < 0) {
			var removed = this.selection.splice(i, 1);
			this._removePivot(removed[0]);
		}
	}
	this.length = this.selection.length;
}});