John C. Norton > Tk-DoubleClick > Tk::DoubleClick

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Module Version: 0.02   Source  

NAME ^

Tk::DoubleClick - Correctly handle single-click vs double-click events, calling only the appropriate callback for the given event.

VERSION ^

Version 0.02

SYNOPSIS ^

    use Tk::Doubleclick;

    bind_clicks(
        $widget,
        [ \&single_callback, @args ],    # Single callback with args
        \&double_callback,               # Double callback without args
        -delay  => 500,
        -button => 'right',
    );

EXPORT ^

bind_clicks()

REQUIRED PARAMETERS ^

$widget

Widget to bind to mousebuttons. Typically a Tk::Button object, but could actually be almost any widget.

[ \&single_click_callback, @single_click_args ],

The callback subroutine to invoke when the event is a single-click, along with the arguments to pass. When no arguments are passed, the brackets can be omitted.

[ \&double_click_callback, @double_click_args ],

The callback subroutine to invoke when the event is a double-click, along with the arguments to pass. When no arguments are passed, the brackets can be omitted.

OPTIONS ^

-delay

Maximum delay time detween clicks in milliseconds. Default is 300. If the second click of a two proximate mouse clicks occurs within the given delay time, the event is considered a double-click. If not, the two clicks are considered two separate (albeit nearly simultaneous) single-clicks.

-button

Mouse button to bind. Options are 1, 2, 3, or the corresponding synonyms 'left', 'middle', or 'right'. The default is 1 ('left').

EXAMPLE ^

    # Libraries
    use strict;
    use warnings;
    use Tk;
    use Tk::DoubleClick;

    # User-defined
    my $a_colors  = [
        [ '#8800FF', '#88FF88', '#88FFFF' ],
        [ '#FF0000', '#FF0088', '#FF00FF' ],
        [ '#FF8800', '#FF8888', '#FF88FF' ],
        [ '#FFFF00', '#FFFF88', '#FFFFFF' ],
    ];

    # Main program
    my $nsingle = my $ndouble = 0;
    my $mw      = new MainWindow(-title => "Double-click example");
    my $f1      = $mw->Frame->pack(-expand => 1, -fill => 'both');
    my @args    = qw( -width 12 -height 2 -relief groove -borderwidth 4 );
    my @pack    = qw( -side left -expand 1 -fill both );

    # Display single/double click counts
    my $lb1 = $f1->Label(-text    => "Single Clicks", @args);
    my $lb2 = $f1->Label(-textvar => \$nsingle,       @args);
    my $lb3 = $f1->Label(-text    => "Double Clicks", @args);
    my $lb4 = $f1->Label(-textvar => \$ndouble,       @args);
    $lb1->pack($lb2, $lb3, $lb4, @pack);

    # Create button for each color, and bind single/double clicks to it
    foreach my $a_color (@$a_colors) {
        my $fr = $mw->Frame->pack(-expand => 1, -fill => 'both');
        foreach my $bg (@$a_color) {
            my $b = $fr->Button(-bg => $bg, -text => $bg, @args);
            $b->pack(@pack);
            bind_clicks($b, [\&single, $lb2, $bg], [\&double, $lb4, $bg]);
        }
    }

    # Make 'Escape' quit the program
    $mw->bind("<Escape>" => sub { exit });

    MainLoop;


    # Callbacks
    sub single {
        my ($lbl, $color) = @_;
        $lbl->configure(-bg => $color);
        ++$nsingle;
    }

    sub double {
        my ($lbl, $color) = @_;
        $lbl->configure(-bg => $color);
        ++$ndouble;
    }

ACKNOWLEDGEMENTS ^

Thanks to Mark Freeman for numerous great suggestions and documentation help.

AUTHOR ^

John C. Norton, <jchnorton at verizon.net>

BUGS ^

Please report any bugs or feature requests to bug-tk-doubleclick at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Tk-DoubleClick. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT ^

You can find documentation for this module with the perldoc command.

    perldoc Tk::DoubleClick

You can also look for information at:

ACKNOWLEDGEMENTS ^

Thanks to Mark Freeman for numerous great suggestions and documentation help.

COPYRIGHT & LICENSE ^

Copyright 2009 John C. Norton.

This program is free software; you can redistribute it and/or modify it under the terms of either: the GNU General Public License as published by the Free Software Foundation; or the Artistic License.

See http://dev.perl.org/licenses/ for more information.

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