Modules and Panels issue

问题

I have the following problem.

In my application I have several modules and each of them have components CollapsableTitleWindow (extends Panel). After opening the window it is added to the container which is in the main application (CollapsableTitleWindowContainer). In these windows you can open another window (and so on).

Now, what is the problem. When I change (reload) any module and I want to open a new window (sub window) with the already loaded window I get this error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
 at mx.containers::Panel/layoutChrome()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\containers\Panel.as:1405]
 at com::CollapsableTitleWindow/layoutChrome()[D:\Flex 3 Workspace\WesobCrm\src\com\CollapsableTitleWindow.as:216]
 at mx.core::Container/updateDisplayList()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2867] (...)

Indicates that the main applications have object Panel

Please help.

P.S. I found a similar problem on http://www.nabble.com/Flex-Module-issue-with-Panel-td20168053.html

ADDED: I extendes the Panel class and do something like that:

override protected function layoutChrome(unscaledWidth:Number, unscaledHeight:Number):void
    {
        use namespace mx_internal;
        if(!(mx_internal::titleBarBackground is TitleBackground)) {
            mx_internal::titleBarBackground = new TitleBackground();
        }
        super.layoutChrome(unscaledWidth, unscaledHeight);          
    }

But now i had something like that: Before
_{(source: ak.bx.pl)}
After
_{(source: ak.bx.pl)}

You can see that it loos style declaration.

回答1:

I found a solution but it is bad pratice:

I add in my main application

public function getProductWindow():ProductWindow {
    return new ProductWindow();
}

And change in the module:

From

var productWindow:ProductWindow = new ProductWindow();

var productWindow:ProductWindow = Application.application.getProductWindow();

If anyone have a better solution ?

来源：https://stackoverflow.com/questions/1623705/modules-and-panels-issue

标签

apache-flex

actionscript-3

flex3

flexbuilder