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package JWebmail::Plugin::Paginate;
use Mojo::Base Mojolicious::Plugin;
use List::Util qw(any max);
use POSIX 'ceil';
sub _clamp {
my ($x, $y, $z) = @_;
die '!($x <= $z)' unless $x <= $z;
if ($x <= $y && $y <= $z) {
return $y;
}
return $x if ($y < $x);
return $z if ($z < $y);
}
sub _paginate {
my %args = @_;
my $first_item = $args{first_item};
my $page_size = $args{page_size};
my $total_items = $args{total_items};
my $current_page = ceil($first_item/$page_size);
my $total_pages = ceil($total_items/$page_size);
my $page = sub {
my $page_ = shift;
return [0, 0] unless $total_items;
$page_ = _clamp(0, $page_, $total_pages-1);
[_clamp(0, $page_*$page_size, $total_items-1), _clamp(0, ($page_+1)*$page_size, $total_items)]
};
my $ret = {
total_items => $total_items,
page_size => $page_size,
total_pages => $total_pages,
current_page => $current_page,
first_page => $page->(0),
prev_page => $page->($current_page-1),
this_page => $page->($current_page),
next_page => $page->($current_page+1),
last_page => $page->($total_pages-1),
};
if ($total_items) {
$ret->{first_item} = $first_item;
$ret->{last_item} = _clamp($first_item, $first_item+$page_size-1, $total_items-1);
}
return $ret;
}
sub paginate {
my $c = shift;
my ($count) = @_;
my $v = $c->validation;
my $start = $v->optional('start')->num(0, undef)->param // 0;
my $psize = $v->optional('page_size')->num(1, undef)->param // 50;
$start = _clamp(0, $start, max($count-1, 0));
my $end = _clamp($start, $start+$psize, max($count, 0));
$c->stash(pgn => _paginate(
first_item => int($start/$psize)*$psize,
page_size => $psize,
total_items => $count,
));
return $start, $end;
}
sub make_link {
my ($c, $txt, $to, %args) = @_;
return $c->link_to(
$txt => $c->url_with->query({start => $c->stash('pgn')->{$to}[0]}),
class => ($c->param('start')//0) == $c->stash('pgn')->{$to}[0] ? join(' ', $args{class}, $args{class_disabled}) : $args{class},
);
}
sub register {
my ($self, $app, $conf) = @_;
$conf //= {};
$app->helper(paginate => \&paginate);
$app->helper('_paginate.make_link' => \&make_link);
}
1
__END__
=encoding utf-8
=head1 NAME
JWebmail::Plugin::Paginate
=head1 SYNOPSIS
sub my_route {
my ($c) = @_;
$c->stash($c->paginate(1234));
}
=head1 DESCRIPTION
L<JWebmail::Helper> provides useful helper functions and validator cheks and filter for
L<JWebmail::Controller::All> and various templates.
=head1 HELPERS
=head2 paginate
A helper for calculating page bounds.
Takes the total number of items as argument.
Reads in 'start' and 'page_size' query arguments.
start is 0 based.
Returns the calculated start and end points as 0 based inclusive range.
Sets the stash values (all 1 based inclusive):
first_item
last_item
total_items
page_size
total_pages
current_page
first_page
prev_page
next_page
last_page
=head1 SEE ALSO
L<JWebmail>
=head1 NOTICE
This package is part of JWebmail.
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