Flex：PopUpManager给出“...空对象引用”错误 [英] Flex: PopUpManager giving "...null object reference" error

问题描述

我有一个主要的应用程序调用几个ViewStack状态，每个状态都有弹出窗口。如果我不打开任何弹出窗口，我可以在状态之间移动罚款。如果我打开一个弹出窗口然后尝试改变状态使用 currentState = ... 我得到错误：

  TypeError：错误＃1009：无法访问空对象引用的属性或方法。 
在spark.components :: Scroller / focusInHandler（）[E：\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as： 2139] 
在flash.display :: Stage / set focus（）
在mx.core :: UIComponent / setFocus（）[E：\dev\4.y\frameworks\projects \framework\src\mx\core\UIComponent.as：9905] 
 ... 
  

我看到其他人有同样的问题，例如这里：
$ b $ p 1031531rel =nofollow> http://forums.adobe.com/thread/1031531

http://forums.adobe.com/message/2767130

http://forums.adobe.com/message/3448443

http://forums.adobe.com/thread/655749?tstart= -1

http://forums.adobe.com/thread/801149

http://flex4examples.wordpress.com/2011/05/05/skinnabletextbase-focusmanager-runtime-error-popup/

http：/ /bugs.adobe.com/jira/browse/SDK-32036?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel

但我还没有想出如何实施推荐的解决方案。这听起来像我应该只包括：

  import mx.managers.PopUpManager; PopUpManager中; 
  

在我的主应用程序中，它应该可以正常工作，但是对我来说不起作用。

我的应用程序的每个视图状态都在一个不同的文件中，每个文件都使用< views：View> 来定义。另外，所有弹出窗口都是单独的文件，定义为< s：TitleWindow> 。每个文件都包含这一行：

  import mx.managers.PopUpManager; 
  

我想知道这是否意味着每个文件都使用不同的弹出式管理器（？），而只有一个应该用于整个应用程序（如何设置？）。

我用来调用弹出窗口的代码是：

  VAR _popupName：MyTitleWindowFileName = MyTitleWindowFileName（
 PopUpManager.createPopUp（此，MyTitleWindowFileName，真））; 
 _popupName.addEventListener（MyAppController.CLOSE_POPUP，onClosePopUp）; 
 PopUpManager.centerPopUp（_popupName）; //调用弹出窗口
  

注意，当主应用程序（定义为 < s：Application> ）运行时，ViewStack状态还没有被加载（因为它们在第一次使用时被加载）。不知道这是否有任何原因/效果在这里。

我试图遵循Adobe的示例代码中传入和从Spark弹出窗口数据部的位置：

http://help.adobe.com/en_US/flex/using/WS6c678f7b363d5da52e8f1ca1124a0430dcf-8000.html#WS6c678f7b363d5da52e8f1ca1124a0430dcf-7ffe

任何想法非常赞赏。

解决方案

看来这是我遇到的情况：

Adob​​e空气：滚动抛出在不同应用程序之间进行更改时发生错误

这是一个Adobe bug。 从解决方案Adobe 是：

通过更改Scroller在使用它之前对focusManager执行空指针检查， code>





这是上面第一个链接尝试做的事情。

另一个链接： http：// forums。 adobe.com/message/3812805

I have a main application calling several ViewStack states, each with popup windows. If I don't open any popup windows, I can move between states fine. If I open a popup window then try to change the state using currentState=... I get the error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at spark.components::Scroller/focusInHandler()[E:\dev\4.y\frameworks\projects\spark\src\spark\components\Scroller.as:2139]
at flash.display::Stage/set focus()
at mx.core::UIComponent/setFocus() [E:\dev\4.y\frameworks\projects\framework\src\mx\core\UIComponent.as:9905]
...

I see others having the same problem, for example here:

http://forums.adobe.com/thread/1031531

http://forums.adobe.com/message/2767130

http://forums.adobe.com/message/3448443

http://forums.adobe.com/thread/655749?tstart=-1

http://forums.adobe.com/thread/801149

http://flex4examples.wordpress.com/2011/05/05/skinnabletextbase-focusmanager-runtime-error-popup/

http://bugs.adobe.com/jira/browse/SDK-32036?page=com.atlassian.jira.plugin.system.issuetabpanels%3Aall-tabpanel

But I haven't figured out how to implement the recommended solution. It sounds like I should just include:

import mx.managers.PopUpManager; PopUpManager;

inside my main application and it should work, but it doesn't work for me.

My application has each view state in a different file, each defined using <views:View>. Also, all of the popups are separate files defined as <s:TitleWindow>. Each file includes this line:

import mx.managers.PopUpManager;

I wonder if this means each file is using a different popup manager(?), when it's a singleton and only one should be used for the whole app (how to set that up?).

The code I use to call a popup is:

var _popupName:MyTitleWindowFileName = MyTitleWindowFileName(
    PopUpManager.createPopUp(this, MyTitleWindowFileName, true));   
_popupName.addEventListener(MyAppController.CLOSE_POPUP,onClosePopUp); 
PopUpManager.centerPopUp(_popupName); // call popup 

Note that when the main application (the one defined as <s:Application>) runs, the ViewStack states have not been loaded yet (since they get loaded when they are used the first time). Not sure if that has any cause/effect here.

I've tried to follow Adobe's example code in the "Passing data to and from a Spark pop-up window" section here:

http://help.adobe.com/en_US/flex/using/WS6c678f7b363d5da52e8f1ca1124a0430dcf-8000.html#WS6c678f7b363d5da52e8f1ca1124a0430dcf-7ffe

Any ideas much appreciated.

解决方案

It appears this is the situation I'm experiencing:

Adobe Air: scroller throws error when changes focus between different applications

It's an Adobe bug. Solution from Adobe is:

This bug is easily fixed by changing Scroller to do a null pointer check on focusManager before using it.

which is what the first link above attempts to do.

Another link: http://forums.adobe.com/message/3812805

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