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    if ($self->{window}->{config}->Read('Device') eq 'mouse')
    {
        EVT_MOUSE_EVENTS($window, sub { my ($self, $event) = @_;
                                        &$subup         if $event->LeftUp;
                                        &$sublosefocus  if $event->Leaving;
                                        &$subgetfocus   if $event->Entering;
                                      });
    }


}

sub Next
{
    my $self = shift;
    my $sub = shift;
    $self->{next} = $sub;
}

sub Select
{
    my $self = shift;
    my $sub = shift;
    $self->{select} = $sub;
}

sub _keycontrol
{
    # BEWARE: $self is the window object this event belongs to
    my ($self, $event) = @_;
    return if $self->{pause};
    $self->{input}->{select}->() if ($event->GetKeyCode == $self->{config}->ReadInt('SelectKey', WXK_RETURN)) || (uc(chr($event->GetKeyCode)) eq uc(chr($self->{config}->ReadInt('SelectKey'))));
    $self->{input}->{next}->()   if (( ($event->GetKeyCode == $self->{config}->ReadInt('NextKey', WXK_SPACE)) ||
                                       (uc(chr($event->GetKeyCode)) eq uc(chr($self->{config}->ReadInt('NextKey'))))) and
                                     (not $self->{config}->ReadInt('Buttons') == 1));
}

sub _iconcontrol
{
    # BEWARE: $self is the window object this event belongs to
    my ($self, $event) = @_;
    return if $self->{pause};
    $self->{input}->{select}->() if $event->LeftUp;
    $self->{input}->{next}->()   if $event->RightUp &&
                                    not $self->{config}->ReadInt('Buttons') == 1;
}

#----------------------------------------------------------------------
# This sub is used to monitor the parallel port for the adremo device
sub _monitorport
{
    # BEWARE: $self is the wxWindow subclass the timer
    # belongs to!
    my ($self, $event) = @_;
    # do nothing if the device is not adremo or
    # if we're already running
    return if ($self->{monitorrun}                           || 
               (not $self->{input}->{next})                  || 
               (not $self->{input}->{select})                ||
               $self->{pause});
    # set the flag that we're checking the port
    $self->{monitorrun} = 1;
    $self->{pp} = Device::ParallelPort->new() if not $self->{pp};
    my $curvalue = $self->{pp}->get_status();
    if (not defined $curvalue)
    {
        # clear the flag that we're checking the port and return
        $self->{monitorrun} = 0;
        return
    }
    $self->{lastvalue} = 0 if not exists $self->{lastvalue};
    # if we detect a change...
    if ($curvalue != $self->{lastvalue})
    {
        unless ($curvalue & 0x40)
        {
            # if bit 6 is off it's a headmove to the right
            # which will indicate a Next() event unless we're in
            # one button mode
            $self->{input}->{next}->() unless $self->{config}->ReadInt('Buttons') == 1;
        }
        if ($curvalue & 0x80)
        {
            # if bit 7 is on (this bit is inverted), it's a headmove to the left
            # which will indicate a Select() event.
            $self->{input}->{select}->();
        }
    }
    # the current value becomes the last value
    $self->{lastvalue} = $curvalue if $curvalue;

    # clear the flag that we're checking the port
    $self->{monitorrun} = 0;
}


1;

__END__

=head1 NAME

AAC::Pvoice::Input - A class that handles the input that controls a pVoice-like application

=head1 SYNOPSIS

  # this module will normally not be called directly. It's called from
  # AAC::Pvoice::Panel by default


=head1 DESCRIPTION

AAC::Pvoice::Input allows one or two button operation of an AAC::Pvoice based
application.
The module uses Device::ParallelPort, so it should be able to run
on Win32 as well as Linux platforms.

=head1 USAGE

=head2 new($window)

This constructor takes the window (AAC::Pvoice::Panel typically) on which
the events and timer will be called as a parameter.
If the configuration (read using Wx::ConfigBase::Get) has a key called
'Device' (which can be set to 'icon', 'keys' , 'mouse' or 'adremo') is set to 'adremo', it
will start polling the parallel port every x milliseconds, where x is the
value of the configuration key 'Interval'. This setting is only useful if you connect
an "Adremo" electrical wheelchair to the parallel port of your PC (for more
information see http://www.adremo.nl).
If the key 'Device' is set to 'icon' it will respond to the left and right
mouse button, and if it's set to 'keys' it will respond to the configuration
keys 'SelectKey' and 'NextKey' (which are the keyboard codes for the 'select'
and 'next' events respectively.

AAC::Pvoice::Input has the ability to operate with either one or two buttons.
If you want to use only one button, you need to set the configuration key "Buttons"
to 1, and it will automatically invoke the subroutine you pass to Next() 
at an interval of the value set in the configuration key OneButtonInterval (set in milliseconds).

The default for is to operate in two button mode, and if OneButtonInterval is not 
set, it will use a default of 2000 milliseconds if "Buttons"  is set to 1.

=head2 newchild($window)

This semi-constructor takes the window (usually a child of the panel you
passed to the new() constructor, on which the events will be called as a parameter.
It doesn't start the timers for polling the parallel port and automatic
invocation of the Next() subroutine, because those timers otherwise would
be started multiple times.
Apart from starting those timers, this method works exactly like the new()

=head2 Next(sub)