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- # NOTE: Derived from ..\blib\lib\Tk\Scrollbar.pm. Changes made here will be lost.
- package Tk::Scrollbar;
-
- # tkScrlByPages --
- # This procedure tells the scrollbar's associated widget to scroll up
- # or down by a given number of screenfuls. It notifies the associated
- # widget in different ways for old and new command syntaxes.
- #
- # Arguments:
- # w - The scrollbar widget.
- # orient - Which kinds of scrollbars this applies to: "h" for
- # horizontal, "v" for vertical, "hv" for both.
- # amount - How many screens to scroll: typically 1 or -1.
-
- sub ScrlByPages
- {
- my $w = shift;
- my $orient = shift;
- my $amount = shift;
- my $cmd = $w->cget("-command");
- return unless (defined $cmd);
- return if (index($orient,substr($w->cget("-orient"),0,1)) < 0);
- my @info = $w->get;
- if (@info == 2)
- {
- $cmd->Call("scroll",$amount,"pages");
- }
- else
- {
- $cmd->Call($info[2]+$amount*($info[1]-1));
- }
- }
-
- 1;
-