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when the widget is destroyed. An almost identical interface, but without
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automatic cancel, and without repeat is provided via Tk::after method.
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=head2 Internal Details
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The internal Tk::After class has the following synopsis:
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$id = Tk::After->new($widget,$time,'once',callback);
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$id = Tk::After->new($widget,$time,'repeat',callback);
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$id = Tk::After->new($widget, tid, $time, 'once', callback);
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$id = Tk::After->new($widget, tid, $time, 'repeat', callback);
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The B<after> method has several forms as follows:
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$id is a Tk::After object, an array of 5 elements:
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I<$widget> is the parent widget reference.
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I<tid> is the internal timer id, a unique string.
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I<$time> is the string 'idle', representing an idle queue timer, or a
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integer millisecond value.
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I<once> or I<repeat> specifies whether the timer is a one-time B<after>
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event, or a repeating B<repeat> event.
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I<callback> specifies a Perl/Tk Tk::Callback object.
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=head1 Changing a B<repeat> timer interval
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It's posible to change a B<repeat> timer's delay value, or even cancel
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any timer, using the B<time> method. If I<delay> is specified and
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non-zero, a new timer delay is established. If I<delay> is zero the
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timer event is canceled just as if I<$id>-E<gt>B<cancel> were invoked.
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In all cases the current millisecond timer delay is returned.
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Note: the new timer delay will take effect on the I<subsequent> timer
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event - this command will not cancel the pending timer event and
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re-issue it with the new delay time.
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=head1 The after() method has several forms as follows:
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=item I<$widget>-E<gt>B<afterInfo>?(I<$id>)?
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This command returns information about existing event handlers. If no I<$id>
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argument is supplied, the command returns a list of the identifiers for all
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existing event handlers created by the B<after> command for this MainWindow. If
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I<$id> is supplied, it specifies an existing handler; I<$id> must have been the
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return value from some previous call to B<after> and it must not have triggered
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yet or been cancelled. In this case the command returns a list with two elements.
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The first element of the list is the callback associated with I<$id>, and the
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second element is either B<idle> or B<timer> to indicate what kind of event
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This command returns information about existing event handlers. If no
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I<$id> argument is supplied, the command returns a list of the
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identifiers for all existing event handlers created by the B<after>
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and B<repeat> commands for I<$widget>. If I<$id> is supplied, it
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specifies an existing handler; I<$id> must have been the return value
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from some previous call to B<after> or B<repeat> and it must not have
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triggered yet or been cancelled. In this case the command returns a
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list with three elements. The first element of the list is the
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callback associated with I<$id>, the second element is either B<idle>
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or the I<integer> timer millisecond value to indicate what kind of
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event handler it is, and the third is a string I<once> or I<repeat> to
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differentiate an B<after> from a B<repeat> event.
added
removed
pod/after.pod
