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Flex中使用currentStateChange事件监听State变化

Categories: Flex; Tagged with: currentStateChange • Event • Flex • State; @ October 9th, 2010 0:12

StateChangeEvent.CURRENT_STATE_CHANGE(currentStateChange):
StateChangeEvent 类代表当组件的 currentState 属性更改时调度的事件。

中文API: http://www.adobe.com/livedocs/flex/3_cn/mx/events/StateChangeEvent.html

使用方法:

1. ActionScript中监听Event

ui.addEventListener(StateChangeEvent.CURRENT_STATE_CHANGE, onCurrentStateChange);

注意: 如果用在主程序Application creationComplete的响应方法中, 可能无法监听首个StateChange事件(进入初始State);

2. MXML中监听Event

currentStateChange="onCurrentStateChange(event)"

附录: 响应函数

/** On State Change . */
protected function onCurrentStateChange(event:StateChangeEvent):void {
	printLog("LastState: " + event.oldState + "; currentState" + currentState);
}

Trace信息:

LastState: StateEmployeesList; currentStateStateDeptMgt

Flex4 State itemCreationPolicy 设定State组件立即创建

Categories: Flex; Tagged with: Flex • Flex4 • itemCreationPolicy • State; @ October 7th, 2010 22:20

没怎么用过State, 据说Flex4中State有很大更新, 今天小用了下. 发现一个问题:

非Start State中的Component在Application Create complete后不能立即使用. 于是想到了之前常用的creationPolicy – 统统设置为ALL, 结果仍旧无济于事.

解决方法: 设定组件itemCreationPolicy="immediate".

(more…)

字符串连续空格处理 – 在线小工具(使用Flex与正则表达式创建)

Categories: Flex; Tagged with: Flex • Tools; @ October 3rd, 2010 22:05

功能: 将会替换所有的(连续)空格为”,”
原理: Flex中使用RegExp替换. (more…)

FREE ebook – Getting started with Adobe Flex (From IBM DB2) Flex快速入门

Categories: Flex; Tagged with: DB2 • Ebook • Flex; @ October 2nd, 2010 23:28

Getting started with Adobe® Flex® couldn’t be easier. Read this free ebook to:

Understand how to build rich internet applications using Flex
Learn how to work with Flex Builder to create, run and debug Flex applications
Understand how Flex works with Web services and databases like DB2®
Learn about the Flex programming basics using MXML® and ActionScript(TM)
Get up to speed with powerful features like data binding, view states, and charting
Practice with hands-on exercises

DB2社区的免费电子书 – Flex快速上手, 尚无中文版.

Go–> https://www.ibm.com/developerworks/wikis/display/db2oncampus/FREE+ebook+-+Getting+started+with+Adobe+Flex

更多DB2社区的免费电子书: ibm.com/db2/books

Flex 诡异错误Access of possibly undefined property…

Categories: Flex; Tagged with: Flex • MXMLC; @ September 17th, 2010 21:34

今天Debug碰到一个诡异的问题.

跑的好好的程序, 一Build就报错. 而且报错位置一直在Application的某一行, 雷打不动. 开始怀疑Build时动了Application, 增加了一个莫名其妙的字符什么的. 后来仔细排查, 原来是Application的Config xml文件中, 在Build时增加了一个{something}的字符.

估计是Flex当做这是一个Bindable的属性来处理了, 于是这行就是有错, 所以报错位置一直不变.

但MXMLC太不厚道了, 错误位置报的很清楚, 但错误文件只是写明了Application, 但问题是却是在Config xml中.

我顶你个肺.

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