child window - is it or isn't it?


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Thread: child window - is it or isn't it?

  1. #1
    TC Guest

    child window - is it or isn't it?

    Hi Folks

    This is one of several sub-problems that I need to solve in order to solve
    a larger problem with printing documents using Word 97 via automation from
    VBA. The larger problem will require the use of the win32 API from VBA,
    hence my desperate resort to this forum!

    Say you use MS Word 97 to print a document whose margins are set outside
    the printable area of the page. Word displays a popup message: "The margins
    of section 1 are set outside the printable area of the page. Do you want to
    continue? [Yes]/[No]".

    I'm confused as to whether that popup IS or ISN'T a child window of the
    Word main window.

    The message can be dragged outside the boundaries of the Word main window,
    which suggests to me that it is NOT a child window. (I believe child
    windows are constrained to the parent window area. Yes?)

    However, if I call GetParent on its window handle, I get the Word main
    window handle - which suggests the popup IS a child window!

    Can anyone tell me whether the popup in question IS or ISN'T a child window
    of the Word main window (& explain the discrepancy noted above)?

    The popup in question gives the following display when using a VBA
    equivalent of the "Spy" type code in Q112649. (My output interprets the
    window style bits.)

    _____________________
    Window Handle: &H5CC
    Window Text: Microsoft Word
    Window Class Name: #32770
    Window Style: &H94C801C5
    -- window styles --
    WS_OVERLAPPED
    WS_POPUP
    WS_VISIBLE
    WS_CLIPSIBLINGS
    WS_CAPTION
    WS_BORDER
    WS_DLGFRAME
    WS_SYSMENU
    WS_TILED
    -- common styles --
    WS_POPUPWINDOW
    -- extended styles --
    WS_EX_DLGMODALFRAME
    WS_EX_NOPARENTNOTIFY
    Window ID Number: &H0
    Parent Window Handle: &HBD0
    Parent Window Text: Microsoft Word - zz cert Aow-fc.doc
    Parent Window Class Name: OpusApp
    Module: C:\PROGRAM FILES\OFFICE97\OFFICE\MSACCESS.EXE
    _____________________


    TIA,
    TC


  2. #2
    TC Guest

    Re: child window - is it or isn't it?


    Jonathan Wood <jwood@softcircuits.com> wrote in article
    <39cf60e0@news.devx.com>...
    > > The message can be dragged outside the boundaries of the Word main

    window,
    > > which suggests to me that it is NOT a child window. (I believe child
    > > windows are constrained to the parent window area. Yes?)

    >
    > Yes, this is correct. Note that WS_CHILD is not one of the reported

    window
    > styles.
    >
    > > However, if I call GetParent on its window handle, I get the Word main
    > > window handle - which suggests the popup IS a child window!

    >
    > This is sometimes referred to as an owned window. It is not a true child
    > window but still has a parent that is always underneath it.
    >
    > Jonathan Wood
    > SoftCircuits Programming
    > http://www.softcircuits.com



    Hi Jonathan

    Thanks for your very prompt reply. (I posted less than an hour ago. It's
    midnight here. I hate to think what it is "there" (wherever "there" is!))

    When you say "owned" window, are you saying that a window can have an
    "owner" window independently of its "parent" window (if any)?

    I assumed that (a) GetParent would return the "parent" window (if any), and
    (b) any window with a "parent" window (as returned by GetParent) was
    necessarily a "child" window.

    Could you elucidate (or point me to a clear explanation of) "owner" window,
    "parent" window and "child" window?

    Thanks,
    TC


  3. #3
    TC Guest

    Re: child window - is it or isn't it?


    Jonathan Wood <jwood@softcircuits.com> wrote in article
    <39cf60e0@news.devx.com>...
    > > The message can be dragged outside the boundaries of the Word main

    window,
    > > which suggests to me that it is NOT a child window. (I believe child
    > > windows are constrained to the parent window area. Yes?)

    >
    > Yes, this is correct. Note that WS_CHILD is not one of the reported

    window
    > styles.
    >
    > > However, if I call GetParent on its window handle, I get the Word main
    > > window handle - which suggests the popup IS a child window!

    >
    > This is sometimes referred to as an owned window. It is not a true child
    > window but still has a parent that is always underneath it.
    >
    > Jonathan Wood
    > SoftCircuits Programming
    > http://www.softcircuits.com



    Hi Jonathan

    Thanks for your very prompt reply. (I posted less than an hour ago. It's
    midnight here. I hate to think what it is "there" (wherever "there" is!))

    When you say "owned" window, are you saying that a window can have an
    "owner" window independently of its "parent" window (if any)?

    I assumed that (a) GetParent would return the "parent" window (if any), and
    (b) any window with a "parent" window (as returned by GetParent) was
    necessarily a "child" window.

    Could you elucidate (or point me to a clear explanation of) "owner" window,
    "parent" window and "child" window?

    Thanks,
    TC


  4. #4
    Jonathan Wood Guest

    Re: child window - is it or isn't it?

    > The message can be dragged outside the boundaries of the Word main window,
    > which suggests to me that it is NOT a child window. (I believe child
    > windows are constrained to the parent window area. Yes?)


    Yes, this is correct. Note that WS_CHILD is not one of the reported window
    styles.

    > However, if I call GetParent on its window handle, I get the Word main
    > window handle - which suggests the popup IS a child window!


    This is sometimes referred to as an owned window. It is not a true child
    window but still has a parent that is always underneath it.

    --
    Jonathan Wood
    SoftCircuits Programming
    http://www.softcircuits.com



  5. #5
    Jonathan Wood Guest

    Re: child window - is it or isn't it?

    > The message can be dragged outside the boundaries of the Word main window,
    > which suggests to me that it is NOT a child window. (I believe child
    > windows are constrained to the parent window area. Yes?)


    Yes, this is correct. Note that WS_CHILD is not one of the reported window
    styles.

    > However, if I call GetParent on its window handle, I get the Word main
    > window handle - which suggests the popup IS a child window!


    This is sometimes referred to as an owned window. It is not a true child
    window but still has a parent that is always underneath it.

    --
    Jonathan Wood
    SoftCircuits Programming
    http://www.softcircuits.com



  6. #6
    Jonathan Wood Guest

    Re: child window - is it or isn't it?

    TC,

    > When you say "owned" window, are you saying that a window can have an
    > "owner" window independently of its "parent" window (if any)?
    >
    > I assumed that (a) GetParent would return the "parent" window (if any),

    and
    > (b) any window with a "parent" window (as returned by GetParent) was
    > necessarily a "child" window.
    >
    > Could you elucidate (or point me to a clear explanation of) "owner"

    window,
    > "parent" window and "child" window?


    Assumption (a) is correct. Assumption (b) is not correct if the owned window
    does not have the WS_CHILD style.

    I don't know a good source for this information. Examples of it include
    owned popup windows such as message boxes, floating toolbars, and the
    drop-down window of a combo box.

    --
    Jonathan Wood
    SoftCircuits Programming
    http://www.softcircuits.com



  7. #7
    Jonathan Wood Guest

    Re: child window - is it or isn't it?

    TC,

    > When you say "owned" window, are you saying that a window can have an
    > "owner" window independently of its "parent" window (if any)?
    >
    > I assumed that (a) GetParent would return the "parent" window (if any),

    and
    > (b) any window with a "parent" window (as returned by GetParent) was
    > necessarily a "child" window.
    >
    > Could you elucidate (or point me to a clear explanation of) "owner"

    window,
    > "parent" window and "child" window?


    Assumption (a) is correct. Assumption (b) is not correct if the owned window
    does not have the WS_CHILD style.

    I don't know a good source for this information. Examples of it include
    owned popup windows such as message boxes, floating toolbars, and the
    drop-down window of a combo box.

    --
    Jonathan Wood
    SoftCircuits Programming
    http://www.softcircuits.com



  8. #8
    TC Guest

    Re: child window - is it or isn't it?

    Jonathan

    After further investigation I've found the following article which explains
    the differences:
    Q84190: INFO: Window Owners and Parents.

    When I've digested it, I'll post the next part of my multi-part problem!

    Thanks again for your help,
    TC


    Jonathan Wood <jwood@softcircuits.com> wrote in article
    <39cf79f3@news.devx.com>...
    > TC,
    >
    > > When you say "owned" window, are you saying that a window can have an
    > > "owner" window independently of its "parent" window (if any)?
    > >
    > > I assumed that (a) GetParent would return the "parent" window (if any),

    > and
    > > (b) any window with a "parent" window (as returned by GetParent) was
    > > necessarily a "child" window.
    > >
    > > Could you elucidate (or point me to a clear explanation of) "owner"

    > window,
    > > "parent" window and "child" window?

    >
    > Assumption (a) is correct. Assumption (b) is not correct if the owned

    window
    > does not have the WS_CHILD style.
    >
    > I don't know a good source for this information. Examples of it include
    > owned popup windows such as message boxes, floating toolbars, and the
    > drop-down window of a combo box.
    >
    > Jonathan Wood
    > SoftCircuits Programming
    > http://www.softcircuits.com



  9. #9
    TC Guest

    Re: child window - is it or isn't it?

    Jonathan

    After further investigation I've found the following article which explains
    the differences:
    Q84190: INFO: Window Owners and Parents.

    When I've digested it, I'll post the next part of my multi-part problem!

    Thanks again for your help,
    TC


    Jonathan Wood <jwood@softcircuits.com> wrote in article
    <39cf79f3@news.devx.com>...
    > TC,
    >
    > > When you say "owned" window, are you saying that a window can have an
    > > "owner" window independently of its "parent" window (if any)?
    > >
    > > I assumed that (a) GetParent would return the "parent" window (if any),

    > and
    > > (b) any window with a "parent" window (as returned by GetParent) was
    > > necessarily a "child" window.
    > >
    > > Could you elucidate (or point me to a clear explanation of) "owner"

    > window,
    > > "parent" window and "child" window?

    >
    > Assumption (a) is correct. Assumption (b) is not correct if the owned

    window
    > does not have the WS_CHILD style.
    >
    > I don't know a good source for this information. Examples of it include
    > owned popup windows such as message boxes, floating toolbars, and the
    > drop-down window of a combo box.
    >
    > Jonathan Wood
    > SoftCircuits Programming
    > http://www.softcircuits.com



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