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Form opened as dialog not modal

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    Form opened as dialog not modal

    Hi All,

    I have a curious question that maybe someone has the answer to. If I open formA as a dialog, formA is modal, however, if I then open formB from formA also as a dialog, form B is modal to everything but formA. Why?

    This is not something I expected to happen.

    Thanks for any input.

    Scott

    #2
    RE: Form opened as dialog not modal

    Well, here's some background theory, some or all of which, you may know, and none of which solves the problem:

    In a message-based system, like Windows (or, within Windows, Alpha 5), the event handling mechanism will take input signals (like key presses, mouse clicks, timer events, etc.) and send them to the appropriate objects.

    When the system is in a non-modal state, keystrokes will typically go to the menuing system first, then (if not handled) find their way down to whatever object has the focus, where positional (mouse) events (get sent to the top-most object that occupies the screen underneath the mouse's hot-spot.

    When an object puts the system in a modal state, it's telling the event-handler "Send all events directly here, bypassing all other objects." (Though positional events outside the object will still often not be sent, depending on the system.)

    I guess the point of this rambling digression is that A5's objects, messaging and modality, while laid on top of Windows' mechanisms are not necessarily mapped directly to their Windows counterparts. So while we're used to a layered modality (where a scope can be continually narrowed), it may be that in A5 there is a single "mode" and everything created after the mode is turned on is non-modal in that scope.

    I can't say that A5 is designed that way, but I've seen systems that were.

    Comment


      #3
      RE: Form opened as dialog not modal

      Scott

      Blakes reply sounds reasonable. This is an issue that has been around since dialog forms have existed in A5. Some users have found workarounds. The simplist is to always close one dialog when you open another. This is not always desirable, but it does work.

      Jerry

      Comment


        #4
        RE: Form opened as dialog not modal

        Thanks Blake and Jerry for your answers. I figured that Alpha used a single mode for forms. I will just have to use the old work arounds for now.

        Thanks again

        Scott

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