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why the datatype changed after form instanced ?

JamesJames

procedure(form1()   ; let((bt1)   let(()     strField = hiCreateStringField(       ?name 'strField       ?defValue ""     )     bt1 = hiCreateButton(       ?name 'bt1       ?buttonText "bt1"       ?callback "printf(\"the value of str: %L\n\" strField~>value)"     )     form1 = hiCreateLayoutForm(       'formn1       "Form1"       hiCreateVerticalBoxLayout(         'form1Vbox         ?items list(           strField           list(bt1)         )       )           )     aa = form1~>bt1     hiDisplayForm(form1)     bb= form1~>bt1   ) )

type(aa) == type(bb)

I'm curios that why the data type changed after form instanced ?

backgroud:  we update the widgets of form must through  hierachty level like :   form~>fieldSymbol~>value  = "value1", here, you can update data through bb but not aa becase that aa is a string filed, bb is a symbol 

Parents
  • JamesJames
    Code formatted as following: 
    procedure(form1()
      ; let((bt1)
      let(()
        strField = hiCreateStringField(
          ?name 'strField
          ?defValue ""
        )
        bt1 = hiCreateButton(
          ?name 'bt1
          ?buttonText "bt1"
          ?callback "printf(\"the value of str: %L\n\" strField~>value)"
        )
        form1 = hiCreateLayoutForm(
          'formn1
          "Form1"
          hiCreateVerticalBoxLayout(
            'form1Vbox
            ?items list(
              strField
              list(bt1)
            )
          )
         
        )
        aa = form1~>bt1
        hiDisplayForm(form1)
        bb= form1~>bt1
      )
    )
Reply
  • JamesJames
    Code formatted as following: 
    procedure(form1()
      ; let((bt1)
      let(()
        strField = hiCreateStringField(
          ?name 'strField
          ?defValue ""
        )
        bt1 = hiCreateButton(
          ?name 'bt1
          ?buttonText "bt1"
          ?callback "printf(\"the value of str: %L\n\" strField~>value)"
        )
        form1 = hiCreateLayoutForm(
          'formn1
          "Form1"
          hiCreateVerticalBoxLayout(
            'form1Vbox
            ?items list(
              strField
              list(bt1)
            )
          )
         
        )
        aa = form1~>bt1
        hiDisplayForm(form1)
        bb= form1~>bt1
      )
    )
Children
  • Andrew Beckett
    in reply to JamesJames

    This is because the field data structures are kind of placeholders until the form is instantiated (hiInstantiateForm does this, but hiDisplayForm does it first too). Then it replaces them with the real structures linked to the UI elements. Keeping a reference to a form field shouldn't be done before it's instantiated - if you need to do this before it's displayed, call hiInstantiateForm(form1) first.

    Andrew

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