Page 7: Summary

[ashimo]

TRY 2 Overview

Event handler structure

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on

Code:

{on event-type do body}
{on event-type at target-var[:target-type] do body}
{on event-var:event-type at target-var[:target-type] do body}

where

• event-var:event-type: binds a variable to the event.
  
• target-var[:target-type]: binds a variable to the target.
  
• body is the code for the event handler procedure.
  

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Branching expressions

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if

Code:

{if condition-1 then
    code-block-1
elseif condition-2 then
    code-block-2
elseif condition-3 then
    code-block-3
    ...
elseif condition-n then
    code-block-n
[else
     code-block-n+1]
}

where

• condition-1, condition-2, ...: are Boolean expressions.
  
• code-block-1, code-block-2, ...: each consist of one or more Curl language expressions.
  

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switch

The switch expression has the following syntax:

Code:

{switch compare-expr [using compare-operator]
     case value-1 do
        code-block-1
     case value-2 do
        code-block-2
        ...
     case value-n do
        code-block-n
        [else code-block-n+1]
    }

where

• compare-expr, value-1, value-2, value-n: are Curl language expressions. These expressions can evaluate to any Curl language type.
  
• compare-operator: the operator that the Curl language uses when comparing compare-expr to value-1, value-2, and so on.
  
• code-block-1, code-block-2, code-block-n: consist of one or more Curl language expressions.
  

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Types of graphical containers