dynamic - How can I make my code wait until two actions are done?

This question was inspired by yode's question found here. I think yode asked the wrong question, so I am asking what I think is the right one.

Consider a situation in which the user has to choose two directories before a computation can move forward. We want to present the user with two file-name setters but have the code wait until the user has chosen one directory from each setter before proceeding. How can we do that?

Answer

Update

My answer is to use Dynamic with the option UpdateInterval -> 1 to hold the code that checks the completion condition.

DynamicModule[{from, to},
  Column[
   {Dynamic @
      Row[
        {FileNameSetter[Dynamic[from], "Directory", Appearance -> "From where"],
         FileNameSetter[Dynamic[to], "Directory", Appearance -> "To where"],
         Button["Reset", Clear[from, to]]}],

    Dynamic[
      If[And @@ {ValueQ[from], ValueQ[to]}, 
        StringJoin[{from, "  ", to}], "Waiting ..."],
      UpdateInterval -> 1]}]]

Before the condition is fulfilled, the user sees

After the condition is fulfilled, the user sees

The Reset button lets the code be reused to pick another pair of directories.

Comments

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