1 USING: help.syntax help.markup kernel math classes classes.tuple
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6 { $class-description "Arrow model values are computed by applying a quotation to the value of another model. Arrows are automatically updated when the underlying model changes. Arrows are constructed by " { $link <arrow> } "." }
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8 "The following code displays a label showing the result of applying " { $link sq } " to the value 5:"
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10 "USING: models ui.gadgets.labels ui.gadgets.panes ;"
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11 "5 <model> [ sq ] <arrow> [ number>string ] <arrow>"
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12 "<label-control> gadget."
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14 "An exercise for the reader is to keep the original model around on the stack, and change its value to 6, observing that the label will immediately display 36."
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18 { $values { "model" model } { "quot" { $quotation ( obj -- newobj ) } } { "arrow" "a new " { $link arrow } } }
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19 { $description "Creates a new instance of " { $link arrow } ". The value of the new arrow model is computed by applying the quotation to the value." }
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20 { $examples "See the example in the documentation for " { $link arrow } "." } ;
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22 ARTICLE: "models.arrow" "Arrow models"
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23 "Arrow model values are computed by applying a quotation to the value of another model."
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29 ABOUT: "models.arrow"
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