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"Can Arrive" Confusion

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    "Can Arrive" Confusion

    Hi All,

    Today's problem is with the 'CanArrive' event of a object on a form.

    I have a form that I wish to place 'CanArrive' events on multiple objects.

    What seems to be happening is that since you theoreticlly can arrive on anything, the wrong 'CanArrive' event is firing.

    So what am I missing here? Is there a way to make the 'CanArrive' event only fire if the object in question is actually trying to get focus(which is the way I assumed it would be)

    Thanks,

    Scott

    #2
    RE:

    Scott:
    ""since you theoreticlly can arrive on anything""
    The name "CanArrive" might be a bit confusing. It does not have to do with the fact that you "Can" arrive to the object since as you indicated you can arrive at anything(with some exceptions) but rather it indicates that the event will fire immediately before the object takes focus.
    The behavior you experience might have to do with the tab stop order on your form.
    If an object happens to be the first tab stop and if it has a CanArrive event, that event will fire once the form is loaded since the pointer will go to that object first.
    Gabe

    Comment


      #3
      RE:

      Hi Scott,

      Remember all the "Can" events refer to CANcel().

      So if you have a field object on your form, and some condition is not met, you can prevent the user form getting to that field object.

      e.g.

      If vUserLevel " "300"
      Cancel()
      end if

      Thus a user with a user_level of only "100", cannot access or change that field value. Make sense?

      Peter
      Peter
      AlphaBase Solutions, LLC

      [email protected]
      https://www.alphabasesolutions.com


      Comment


        #4
        RE:

        Gabe,

        Thats what I assumed the 'CanArrive' event would do, is to fire before the object gets focus, but this does not seem to be the case looking at the trace window. I can see all object 'CanArrive' events firing when a field is departed.

        My tab order on the form actually starts with a field that does not includes a 'CanArrive' event, so I am not quite sure whats happening here. I will investigate it more.

        Thanks,

        Scott

        Comment


          #5
          RE:

          Peter,

          Hey, hows things?

          Yes I tried the cancel() method. My problem is that I want to allow users to arrive at any field. What I am trying to do is get the object name with in the 'CanArrive' event.

          The reason I am trying to do this is because I have a 'OnDepart' event of a field that sends key strokes. This code seems to make a button freeze when its pressed and not fire its 'OnPush' event. SO I figure that I can code something like, if your leaving this field and arriving on a button, bypass the 'OnDepart' event.

          I have noticed that the firing order is:
          CanArrive
          CanDepart
          OnArrive
          OnDepart

          So maybe you can see my problem.

          Scott

          Comment


            #6
            RE:

            Scott,

            There must be something wrong with your form. I just tested a sample field:

            The events fire in their proper order:

            CanArrive
            OnArrive
            CanDepart
            OnDepart

            I don't think you can "bypass" the OnDepart event.

            -Peter
            Peter
            AlphaBase Solutions, LLC

            [email protected]
            https://www.alphabasesolutions.com


            Comment


              #7
              RE:

              This won't be very helpful but it may not just be a particular form. A month or so ago I was trying to put some simple code on a CanArrive event and had it firing when... (this part I forget, which is why this won't be very helpful). So I gave up and went elsewhere. I suspect a bug, but who knows. What I do know is that I have used CanArrive events for years and never saw this kind of unwanted firing. It may been that it fired when loading the form, or departing some other field but not going to the field in question, or maybe when resyncing fields or the entire form. I just do not remember, and just decided to accomplish the desired task in another way. Yeah, I should have experimented and reported it as a bug if that's what it looked like, but I just did not have time.

              Ray

              Comment


                #8
                RE:

                Scott:
                I agree with Peter, this should be the order of firiniing, but again your Trace window tells a different story.
                It appears that you have multiple events on multiple objects and what makes the water muddier is the send keys event (I hardly ever use those by the way). So, I think it would be best if you post you DB for others to sort through these events, you might get better insight and alternative means to accomplish what you wish.
                Gabe

                Comment


                  #9
                  RE:

                  ""SO I figure that I can code something like, if your leaving this field and arriving on a button, bypass the 'OnDepart' event. ""
                  By the time you get to the button, it's too late, the OnDepart has laready fired.
                  Gabe

                  Comment


                    #10
                    RE:

                    Hi Scott,

                    "What I am trying to do is get the object name...."

                    If that is all you need you should look into
                    [layout].active_prev()
                    which returns the name of the object which just lost focus.

                    So you could use this on the on_depart event to trap the name.

                    I don't know exactly what you're trying to do so I can't judge whether this is the solution.

                    Bill
                    Bill Hanigsberg

                    Comment

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