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Using the same function with different extended object types
Posted on 2011-03-07
Hi still being very green with Actionscript, I wonder if you could help with the following,
For the sake of an example think of a page in a book where,
I have 4 seperate classes, ParagraphData, PartHeadingData, FooterData and ListData each which extend from the PageItemData class, a pageItem being its namesake on a page and each class has a different set of extended properties
Each "page of the book" as such is presented in an array called pageData and contains for example 3 instances of ParagraphData, 1 PartHeadingData , 1 list etc
What I need to do is iterate over the pageData array and act accordingly depending on what object type is currently being examined.
I have tried the following but with no success.
for each (var pageItem:PageItemData in pageData){
//check for prefix span and add if true
if (pageItem.has_Prefix_Span && pageItem.prefix_Span_Text!
createParagraphPrefixSpan(
}
//check for inline graphic
if ((pageItem.paragraph_Conta
pElem=figure.checkForFigur
}
The first portion works because of the properties within the PageItemData class which are common to all , but the second does not ,even if I try to cast to the correct datatype, the compiler keeps complaining about
1118: Implicit coercion of a value with static type vo:PageItemData to a possibly unrelated type vo:ParagraphData
1119: Access of possibly undefined property paragraph_Contains_Figure through a reference with static type vo:PageItemData
I know I could replace the first line with
for each (var pageItem:* in pageData){
but this seems odd to me seing as all the items being iterated over are extended from the type shown.
What am I missing here and thanks in advance
John
}
For the sake of an example think of a page in a book where,
I have 4 seperate classes, ParagraphData, PartHeadingData, FooterData and ListData each which extend from the PageItemData class, a pageItem being its namesake on a page and each class has a different set of extended properties
Each "page of the book" as such is presented in an array called pageData and contains for example 3 instances of ParagraphData, 1 PartHeadingData , 1 list etc
What I need to do is iterate over the pageData array and act accordingly depending on what object type is currently being examined.
I have tried the following but with no success.
for each (var pageItem:PageItemData in pageData){
//check for prefix span and add if true
if (pageItem.has_Prefix_Span && pageItem.prefix_Span_Text!
createParagraphPrefixSpan(
}
//check for inline graphic
if ((pageItem.paragraph_Conta
pElem=figure.checkForFigur
}
The first portion works because of the properties within the PageItemData class which are common to all , but the second does not ,even if I try to cast to the correct datatype, the compiler keeps complaining about
1118: Implicit coercion of a value with static type vo:PageItemData to a possibly unrelated type vo:ParagraphData
1119: Access of possibly undefined property paragraph_Contains_Figure through a reference with static type vo:PageItemData
I know I could replace the first line with
for each (var pageItem:* in pageData){
but this seems odd to me seing as all the items being iterated over are extended from the type shown.
What am I missing here and thanks in advance
John
}
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2 Comments
Well I'd to some checks the following way:
In the if-part you check if the type is the one you expect.
If it is I tend to define a local varialbe containing a casted reference to the type I did my check for. This makes working with it a lot easier.
By the way ... I wouldn't write "!==" ... I think you are looking for "!=" (Actually I don't know what !== actually does think it's a check for instance equality)
if(pageItem is ParagraphData) {
var paragraphData:ParagraphData = ParagraphData(pageItem);
... work with paragraphData ...
}
In the if-part you check if the type is the one you expect.
If it is I tend to define a local varialbe containing a casted reference to the type I did my check for. This makes working with it a lot easier.
By the way ... I wouldn't write "!==" ... I think you are looking for "!=" (Actually I don't know what !== actually does think it's a check for instance equality)
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