func (this *GUI) showOrHideContainerDependingOnIfEval(ifStmt interfaces.If, conditionalContainer *ui.Box) {
conditionValue := ifStmt.EvalConditionAsBool(this.Symbols)
// if condition evals to true
if conditionValue {
conditionalContainer.Show()
return
}
// condition evals to false
conditionalContainer.Hide()
}
// VisitIf creates questions embedded in an its body and registers show/hide callbacks
func (this *GUI) VisitIf(ifStmt interfaces.If, context interface{}) interface{} {
guiQuestions := handleQuestions(this, ifStmt.Questions())
questionsEncompassingContainer := this.GUIForm.createQuestionTable(guiQuestions)
this.registerOnShowCallback(func() {
this.GUIForm.addQuestionContainer(questionsEncompassingContainer)
this.showOrHideContainerDependingOnIfEval(ifStmt, questionsEncompassingContainer)
})
this.Symbols.RegisterCallback(func() {
log.Debug("Received symbols update callback in If")
this.showOrHideContainerDependingOnIfEval(ifStmt, questionsEncompassingContainer)
})
return nil
}