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Prima::ScrollBar(3) User Contributed Perl Documentation Prima::ScrollBar(3)

NAME

Prima::ScrollBar - scroll bars

DESCRIPTION

"Prima::ScrollBar" implements standard vertical and horizontal scrollbars

SYNOPSIS

        use Prima::ScrollBar;
        my $sb = Prima::ScrollBar->new( owner => $group, %rest_of_profile);
        my $sb = $group-> insert( 'ScrollBar', %rest_of_profile);
        my $isAutoTrack = $sb-> autoTrack;
        $sb-> autoTrack( $yesNo);
        my $val = $sb-> value;
        $sb-> value( $value);
        my $min = $sb-> min;
        my $max = $sb-> max;
        $sb-> min( $min);
        $sb-> max( $max);
        $sb-> set_bounds( $min, $max);
        my $step = $sb-> step;
        my $pageStep = $sb-> pageStep;
        $sb-> step( $step);
        $sb-> pageStep( $pageStep);
        my $partial = $sb-> partial;
        my $whole = $sb-> whole;
        $sb-> partial( $partial);
        $sb-> whole( $whole);
        $sb-> set_proportion( $partial, $whole);
        my $size = $sb-> minThumbSize;
        $sb-> minThumbSize( $size);
        my $isVertical = $sb-> vertical;
        $sb-> vertical( $yesNo);
        my ($width,$height) = $sb-> get_default_size;

API

Properties

Tells the widget if it should send the "Change" notification during mouse tracking events. Generally, it should only be set to 0 on very slow computers.

The default value: 1

The default value is "gm::GrowHiX", i.e. the scrollbar will try to maintain the constant distance from its right edge to its owner's right edge as the owner changes its size. This is useful for horizontal scrollbars.
The default value is $Prima::ScrollBar::stdMetrics[1], which is an operating system-dependent value determined with a call to "Prima::Application-> get_default_scrollbar_metrics". The height is affected because by default the horizontal "ScrollBar" will be created.
Sets the upper limit for "value".

The default value: 100.

Sets the lower limit for "value".

The default value: 0

A minimal thumb breadth in pixels. The thumb cannot have a main dimension lesser than this.

The default value: 21

This determines the increment/decrement to "value" during the operations that suppose to scroll by pages, for example clicking the mouse on the strip outside the thumb, or pressing "PgDn" or "PgUp".

The default value: 10

This tells the scrollbar how many imaginary units the thumb should occupy. See "whole" below.

The default value: 10

The default value is 0. If set to 1 the widget receives keyboard focus; when in focus, the thumb bar is blinking.
This determines the minimal increment/decrement to "value" during mouse/keyboard interaction.

The default value is 1

A basic scrollbar property; reflects the imaginary position between "min" and "max", which corresponds directly to the position of the thumb.

The default value is 0

Determines the main scrollbar style. Set this to 1 when the scrollbar style is vertical, 0 - horizontal. The property can be changed at run-time, so the scrollbars can morph from horizontal to vertical and vice versa.

The default value is 0

This tells the scrollbar how many imaginary units correspond to the whole length of the scrollbar. This value has nothing in common with "min" and "max". You may think of the combination of "partial" and "whole" as the proportion between the visible size of something (document, for example) and the whole size of that "something".

The default value is 100.

Methods

Returns two integers, the default platform-dependant width of a vertical scrollbar and the height of a horizontal scrollbar.

Events

The "Change" notification is sent whenever the thumb position of the scrollbar is changed, subject to certain limitations when "autoTrack" is 0. The notification is sent when appropriate, regardless of whether due to the user interaction or a side effect of some method the programmer has called.
If "autoTrack" is 0, called when the user changes the thumb position with the mouse.

EXAMPLE

        use Prima;
        use Prima::Application name => 'ScrollBar test';
        use Prima::ScrollBar;
        my $w = Prima::Window->new(
                text => 'ScrollBar test',
                size => [300,200]);
        my $sb = $w-> insert( ScrollBar =>
                width => 280,
                left => 10,
                bottom => 50,
                onChange => sub {
                        $w-> text( $_[0]-> value);
                });
        run Prima;

SEE ALSO

Prima, Prima::Widget, examples/scrollbar.pl, examples/scrollbar2.pl

AUTHORS

Dmitry Karasik <dk@plab.ku.dk>, Anton Berezin <tobez@plab.ku.dk> - documentation

2024-02-01 perl v5.38.2