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ActionScript: how can this happen?

This code throws an error:

    if (modalMessage != null && contains(modalMessage))
    {
        removeChild(modalMessage); // the error is here
        modalMessage = null;            
    }

Error:

[Fault] exception, information=ArgumentError: Error #2025: The supplied DisplayObject must be a child of the caller.

how can it be? I check if this is a child in advance.

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1 answer

contains()will return true if the object is a descendant of the caller. This will return the truth to indirect descendants, children of children, etc.

Determines whether the specified display object is a child of the DisplayObjectContainer instance or the instance itself. The search includes the entire display list, including this DisplayObjectContainer instance. Grandchildren, great-grandchildren, etc. All are true.

http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/DisplayObjectContainer.html#contains%28%29

You can check the parent:

if(modalMessage && modalMessage.parent && modalMessage.parent == this)

Or, for a general purpose solution:

if(modalMessage) {
    if(modalMessage.parent) DisplayObjectContainer(modalMessage.parent).removeChild(modalMessage);
    modalMessage = null;
}
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