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Re: Re: "Always on top" with Win32 and Tk

by elwarren (Priest)
on May 09, 2001 at 23:35 UTC ( [id://79214]=note: print w/replies, xml ) Need Help??


in reply to Re: "Always on top" with Win32 and Tk
in thread "Always on top" with Win32 and Tk

A quick Google Search gives me this snippet of VB code. You could possibly do this with the assistance of a Win32::API guru?

http://home.newsfactory.net/~DataGhost/VBing/code/Windows%20Operations/alwaysontop.htm

HTH
  • Comment on Re: Re: "Always on top" with Win32 and Tk

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Re: Re: Re: "Always on top" with Win32 and Tk
by kevin_i_orourke (Friar) on May 11, 2001 at 15:12 UTC

    I've got it working now! As before I've removed most of the code from my program.

    use Tk; use Win32::API; ... # Windows constants my ($OnTop, $NoTop, $Top) = (-1, -2, 0); my ($SWP_NOMOVE, $SWP_NOSIZE) = (2, 1); # 'always on top' state my $isOnTop = $NoTop; ... # Create a Win32::API object for SetWindowPos my $SetWindowPos = new Win32::API("user32", "SetWindowPos", [N,N,N,N,N +,N,N], N); # and one for FindWindow my $FindWindow = new Win32::API("user32", "FindWindow", [P,P], N); ... my $w = new MainWindow; ... my $aotCBut = $w->Checkbutton(-text => "Always on top", -onvalue => $OnTop, -offvalue => $NoTop, -variable => \$isOnTop, -command => sub { # get a handle to the toplevel window containing our Perl/Tk a +pp my $class = "TkTopLevel"; my $name = $w->title; my $NULL = 0; my $topHwnd = $FindWindow->Call($class, $name); if ($topHwnd != $NULL) { # change 'always on top' state $SetWindowPos->Call($topHwnd, $isOnTop, 0, 0, 0, 0, $SWP_N +OMOVE | $SWP_NOSIZE); }; }) ->pack(-side => "bottom", expand => "yes", -fill => "x"); ... # start the UI MainLoop;

    The Win32 FindWindow API call will return a handle to a window with the specified title and class. Perl/Tk creates windows of the class TkTopLevel. You must call this after the window has been mapped (i.e. after MainLoop), otherwise you won't get a valid window handle.

    A useful reference when using Win32::API is here, it talks about Visual Basic but you can fairly easily convert it to Perl.

    --
    Kevin O'Rourke
    
      Hi, I'm kind of a newbie in perl but i noticed your code had some trouble running on my pc... the corrections made were in the creation of the api SetWindowPos object which now becomes Win32::API->new('user32', 'SetWindowPos', ['N','N','N','N','N','N','N'], 'N'); or you might as well code it [NNNNNNN], N, i think it will work (havent tested...) and the creation of the FindWindow obj also: Win32::API->new('user32', 'FindWindow', ['P','P'], 'N'); again [PP], N... that made it work on my pc... anyway, thanks for the code!
Re: Re: Re: "Always on top" with Win32 and Tk
by kevin_i_orourke (Friar) on May 10, 2001 at 17:43 UTC

    I tried the VB code, converted to Perl and using Win32::API. (the code isn't the tidiest in the world, I've missed out most of the program):

    ... use Tk; use Win32::API; # Windows constants my ($OnTop, $NoTop, $Top) = (-1, -2, 0); my ($SWP_NOMOVE, $SWP_NOSIZE) = (2, 1); ... # Create a Win32::API object for SetWindowPos my $SetWindowPos = new Win32::API("user32", "SetWindowPos", [N,N,N,N,N +,N,N], N); ... my $w = new MainWindow; ... # do the 'always on top' bit my $hwnd = $w->frame; # frame returns a hex value as a string, e.g. "0 +x1234" print "$hwnd\n"; $SetWindowPos->Call(hex($hwnd), $OnTop, 0, 0, 0, 0, $SWP_NOMOVE | $SWP +_NOSIZE); MainLoop;

    Unfortunately $w->frame returns the Tk MainWindow, not the Win32 window containing it. As a result setting $w->frame 'always on top' doesn't have any effect.

    Anyone know how to get an HWND for a window's parent out of Win32? Tk::Wm's $w->wrapper doesn't work either.

    --
    Kevin O'Rourke
    
      Anyone know how to get an HWND for a window's parent out of Win32?
      Try the GetParent API call.
Re: Re: Re: "Always on top" with Win32 and Tk
by kevin_i_orourke (Friar) on May 10, 2001 at 16:13 UTC

    Thanks, I've had a look at the VB. I assume if I can extract an HWND from Tk I could use this. It's a bit nasty but looks like the only way.

    From my reading of Tk::Wm documentation I should be able to get the HWND using $w->frame. Time for a play with Win32::API

    --
    Kevin O'Rourke
    

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