How do I get OnMouseOver event to work on a label?

ZJ.Mike.2009 has asked for the wisdom of the Perl Monks concerning the following question:

Greetings Monks, I'm trying to modify a code snippet that has MouseOver event on a main window object to work on a label object but somehow it simply doesn't work. Can someone kindly give me some guidance on what I might be doing wrong? Thanks in advance.

use Win32::GUI();

sub TME_HOVER() {1}
sub TME_LEAVE() {2}
sub HOVER_DEFAULT() {0xFFFFFFFF}

$state = 0;

$mw = Win32::GUI::Window->new(
        -title => 'Test',
        -pos => [170,100],
        -size => [200,220],
        
);

$label = $mw->AddLabel(
-background => [0,0,255], 
-pos => [ 70, 60 ],
-size => [50, 50 ],
-onMouseOver => sub {
$label->Change(-background => [255,0,0], ); 
return 0;
},
-onMouseOut  => sub {
$label->Change(-background => [255,0,0], ); 
$state=0; 
return 0;},
-onMouseMove => \&Move,
);

$mw->Show();
Win32::GUI::Dialog();
exit(0);

sub Move
{
        return unless $state == 0;
        $state = 1;
        $label->TrackMouse(500,TME_HOVER|TME_LEAVE);
        return 1;
}
[download]

Comment on How do I get OnMouseOver event to work on a label? Download Code

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Re: How do I get OnMouseOver event to work on a label? by zentara (Cardinal) on Jan 30, 2010 at 15:17 UTC
I'm not familiar with Win32GUI, but Gtk2 has a similar behavior with Labels. The labels don't have an underlying lowlevel widget window, so they don't respond to mouse movements. In Gtk2, we get around it by putting the label into what is called an event-box.... then the event-box responds. Upon googling myself for "Win32GUI label event", it seems the label needs the notify=>1, option. YMMV I'm not really a human, but I play one on earth. Old Perl Programmer Haiku	[reply]
Re^2: How do I get OnMouseOver event to work on a label? by ZJ.Mike.2009 (Scribe) on Jan 31, 2010 at 02:23 UTC
Thanks zentara. Problem solved :)	[reply]
Re^2: How do I get OnMouseOver event to work on a label? by Anonymous Monk on Jan 31, 2010 at 02:04 UTC
Thank, Anonymous Monk :) I finally figured it out. I actually had the notify=>1 option in my original script but it didn't work like expected (didn't change the background color of the label) so I removed it afterwards, thinking it was useless. Now I have the notify=>1 option and after several failed experiments, I now realize I have to add the -text => '' option in my script to make things really work. Well, it's kind of weird that in order to change the background color of a label I have to add the quite irrelevant -text => '' option. But it does the trick Here's the code that works for me. Please note the -text => '' option in the Change() function.: use Win32::GUI(); use constant { TME_HOVER => 1, TME_LEAVE => 2, HOVER_DEFAULT => 0xFFFFFFFF, }; $state = 0; $mw = Win32::GUI::Window->new( -title => 'Test', -pos => [170,100], -size => [200,220], ); $label = $mw->AddLabel( -background => [0,0,255], -pos => [ 70, 60 ], -size => [50, 50 ], -notify=>1, -onMouseOver => sub { $label->Change(-background => [255,0,0],-text=>'', ); return 0; }, -onMouseOut => sub { $label->Change(-background => [0,0,255],-text=>'', ); $state=0; return 0;}, -onMouseMove => \&Move, ); $mw->Show(); Win32::GUI::Dialog(); sub Move { return unless $state == 0; $state = 1; $label->TrackMouse(100,TME_HOVER\|TME_LEAVE); return 1; } [download] And also thanks for the use constant suggestion :)	[reply] [d/l]
Re: How do I get OnMouseOver event to work on a label? by AnomalousMonk (Archbishop) on Jan 30, 2010 at 19:09 UTC
Just a matter of idle curiosity, but may I ask why you use `sub TME_HOVER() {1}` instead of the constant module, e.g., `use constant TME_HOVER => 1;` or `use constant {` `TME_HOVER => 1,` `TME_LEAVE => 2,` `HOVER_DEFAULT => 0xFFFFFFFF,` `};` or perhaps better yet, the Readonly module?	[reply] [d/l] [select]