Lingo Dictionary > A-C > callAncestor |
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callAncestor
Syntax
callAncestor
handlerName
,
script
, {
args
...}
Description
Command; sends a message to a child object's ancestor script, where handlerName
is the name of the handler to be activated, script
references the script instance or a list of script instances, and args
are any optional parameters to be passed to the handler.
If script
is a single script instance, an error alert occurs if the handler is not defined in the ancestor of the script.
If script
is a list of script instances, the message is sent to each item in the list in turn. In this case, if the handler is not defined in an ancestor script, no alert is generated.
Ancestors can, in turn, have their own ancestors.
When you use callAncestor
, the name of the handler can be a variable, and you can explicitly bypass the handlers in the primary script and go directly to the ancestor script.
Example
This example shows how a callAncestor
statement can call handlers in the ancestor of a behavior or parent script.
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This is the parent script: |
-- script "man" property ancestor on new me, newTool set ancestor = new(script "Animal", 2) return me end on run me put "Man running with "&the legCount of me&"legs" end |
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This is the ancestor script: |
-- script "animal" property legCount on new me, newLegCount set legCount = newLegCount return me end on run me put "Animal running with "& legCount &" legs" end on walk me put "Animal walking with "& legCount &" legs" end |
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The following statements use the parent script and ancestor script. |
This statement creates an instance of the parent script: |
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set m = new(script "man") |
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This statement makes the man walk: |
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call #walk, m -- "Animal walking with 2 legs" |
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This statement makes the man run: |
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set msg = #run callAncestor msg, m -- "Animal running with 2 legs" |
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This statement creates a second instance of the parent script: |
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set m2 = new(script "man") |
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This statement sends a message to the ancestor script for both men: |
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callAncestor #run,[m,m2] -- "Animal running with 2 legs" -- "Animal running with 2 legs" |
See also
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