GZ/nwyj/WebContent/admin/scripts/ext20/examples/form/SelectBox.js

/*
 * Ext JS Library 2.0 Copyright(c) 2006-2007, Ext JS, LLC. licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/**
 * Makes a ComboBox more closely mimic an HTML SELECT. Supports clicking and
 * dragging through the list, with item selection occurring when the mouse
 * button is released. When used will automatically set {@link #editable} to
 * false and call {@link Ext.Element#unselectable} on inner elements.
 * Re-enabling editable after calling this will NOT work.
 * 
 * @author Corey Gilmore http://extjs.com/forum/showthread.php?t=6392
 * 
 * @history 2007-07-08 jvs Slight mods for Ext 2.0
 */
Ext.ux.SelectBox = function(config) {
	this.searchResetDelay = 1000;
	config = config || {};
	config = Ext.apply(config || {}, {
				editable : false,
				forceSelection : true,
				rowHeight : false,
				lastSearchTerm : false,
				triggerAction : 'all',
				mode : 'local'
			});

	Ext.ux.SelectBox.superclass.constructor.apply(this, arguments);

	this.lastSelectedIndex = this.selectedIndex || 0;
};

Ext.extend(Ext.ux.SelectBox, Ext.form.ComboBox, {

			initEvents : function() {
				Ext.ux.SelectBox.superclass.initEvents.apply(this, arguments);
				// you need to use keypress to capture upper/lower case and
				// shift+key, but it doesn't work in IE
				this.el.on('keydown', this.keySearch, this, true);
				this.cshTask = new Ext.util.DelayedTask(
						this.clearSearchHistory, this);
			},

			keySearch : function(e, target, options) {
				var raw = e.getKey();
				var key = String.fromCharCode(raw);
				var startIndex = 0;

				if (!this.store.getCount()) {
					return;
				}

				switch (raw) {
					case Ext.EventObject.HOME :
						e.stopEvent();
						this.selectFirst();
						return;

					case Ext.EventObject.END :
						e.stopEvent();
						this.selectLast();
						return;

					case Ext.EventObject.PAGEDOWN :
						this.selectNextPage();
						e.stopEvent();
						return;

					case Ext.EventObject.PAGEUP :
						this.selectPrevPage();
						e.stopEvent();
						return;
				}

				// skip special keys other than the shift key
				if ((e.hasModifier() && !e.shiftKey) || e.isNavKeyPress()
						|| e.isSpecialKey()) {
					return;
				}
				if (this.lastSearchTerm == key) {
					startIndex = this.lastSelectedIndex;
				}
				this.search(this.displayField, key, startIndex);
				this.cshTask.delay(this.searchResetDelay);
			},

			onRender : function(ct, position) {
				this.store.on('load', this.calcRowsPerPage, this);
				Ext.ux.SelectBox.superclass.onRender.apply(this, arguments);
				if (this.mode == 'local') {
					this.calcRowsPerPage();
				}
			},

			onSelect : function(record, index, skipCollapse) {
				if (this.fireEvent('beforeselect', this, record, index) !== false) {
					this.setValue(record.data[this.valueField
							|| this.displayField]);
					if (!skipCollapse) {
						this.collapse();
					}
					this.lastSelectedIndex = index + 1;
					this.fireEvent('select', this, record, index);
				}
			},

			render : function(ct) {
				Ext.ux.SelectBox.superclass.render.apply(this, arguments);
				if (Ext.isSafari) {
					this.el.swallowEvent('mousedown', true);
				}
				this.el.unselectable();
				this.innerList.unselectable();
				this.trigger.unselectable();
				this.innerList.on('mouseup', function(e, target, options) {
							if (target.id && target.id == this.innerList.id) {
								return;
							}
							this.onViewClick();
						}, this);

				this.innerList.on('mouseover', function(e, target, options) {
							if (target.id && target.id == this.innerList.id) {
								return;
							}
							this.lastSelectedIndex = this.view
									.getSelectedIndexes()[0]
									+ 1;
							this.cshTask.delay(this.searchResetDelay);
						}, this);

				this.trigger.un('click', this.onTriggerClick, this);
				this.trigger.on('mousedown', function(e, target, options) {
							e.preventDefault();
							this.onTriggerClick();
						}, this);

				this.on('collapse', function(e, target, options) {
							Ext.getDoc().un('mouseup', this.collapseIf, this);
						}, this, true);

				this.on('expand', function(e, target, options) {
							Ext.getDoc().on('mouseup', this.collapseIf, this);
						}, this, true);
			},

			clearSearchHistory : function() {
				this.lastSelectedIndex = 0;
				this.lastSearchTerm = false;
			},

			selectFirst : function() {
				this.focusAndSelect(this.store.data.first());
			},

			selectLast : function() {
				this.focusAndSelect(this.store.data.last());
			},

			selectPrevPage : function() {
				if (!this.rowHeight) {
					return;
				}
				var index = Math.max(this.selectedIndex - this.rowsPerPage, 0);
				this.focusAndSelect(this.store.getAt(index));
			},

			selectNextPage : function() {
				if (!this.rowHeight) {
					return;
				}
				var index = Math.min(this.selectedIndex + this.rowsPerPage,
						this.store.getCount() - 1);
				this.focusAndSelect(this.store.getAt(index));
			},

			search : function(field, value, startIndex) {
				field = field || this.displayField;
				this.lastSearchTerm = value;
				var index = this.store.find.apply(this.store, arguments);
				if (index !== -1) {
					this.focusAndSelect(index);
				}
			},

			focusAndSelect : function(record) {
				var index = typeof record === 'number' ? record : this.store
						.indexOf(record);
				this.select(index, this.isExpanded());
				this.onSelect(this.store.getAt(record), index, this
								.isExpanded());
			},

			calcRowsPerPage : function() {
				if (this.store.getCount()) {
					this.rowHeight = Ext.fly(this.view.getNode(0)).getHeight();
					this.rowsPerPage = this.maxHeight / this.rowHeight;
				} else {
					this.rowHeight = false;
				}
			}

		});