Obtaining rectangle coordinates after a repaint - OS2

This is a discussion on Obtaining rectangle coordinates after a repaint - OS2 ; Hello, I populate a container in details view with a number of rows. There are enough so that the window must be scrolled to see all of them. If a row is selected, I query the row's position with CM_QUERYRECORDRECT, ...

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Thread: Obtaining rectangle coordinates after a repaint

  1. Obtaining rectangle coordinates after a repaint

    Hello,
    I populate a container in details view with a number of rows. There are
    enough so that the window must be scrolled to see all of them.
    If a row is selected, I query the row's position with
    CM_QUERYRECORDRECT, and position the window with CM_SCROLLWINDOW.
    After loading the window and setting the various rows' attributes, I
    call CM_INVALIDATERECORD to update the window, followed by WinShowWindow().
    The problem is that it would seem the window update runs in a separate
    thread and is not necessarily completed when the CM_QUERYRECORDRECT is
    sent. The result is invalid rectangle data; there is no error indication.
    If I add a delay before the query, say 100 - 200 mSec, the query succeeds
    as expected.
    Is there some flag that can be tested to know when a window's geometry
    is stable?

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  2. Re: Obtaining rectangle coordinates after a repaint

    In , on 09/18/2008
    at 07:43 PM, Jim Moe said:

    Hi,

    > If a row is selected, I query the row's position with
    >CM_QUERYRECORDRECT, and position the window with CM_SCROLLWINDOW.
    > After loading the window and setting the various rows' attributes, I
    >call CM_INVALIDATERECORD to update the window, followed by
    >WinShowWindow().

    > The problem is that it would seem the window update runs in a separate
    >thread and is not necessarily completed when the CM_QUERYRECORDRECT is
    >sent.

    If this is the case, pmmail is probably doing part of the work in an
    object window.

    If so, one relatively easy way to synchronize the threads is to post a
    message to the GUI thread when the object thread completes its work. This
    can trigger the GUI thread to finish the work that must be done on the GUI
    thread.

    > Is there some flag that can be tested to know when a window's geometry
    >is stable?

    No. You need to write code that properly synchronizes work done by
    multiple threads.

    Steven

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