1Prima::ScrollBar(3)   User Contributed Perl Documentation  Prima::ScrollBar(3)
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NAME

6       Prima::ScrollBar - standard scroll bars class
7

DESCRIPTION

9       The class "Prima::ScrollBar" implements both vertical and horizontal
10       scrollbars in Prima. This is a purely Perl class without any
11       C-implemented parts except those inherited from "Prima::Widget".
12

SYNOPSIS

14               use Prima::ScrollBar;
15
16               my $sb = Prima::ScrollBar-> create( owner => $group, %rest_of_profile);
17               my $sb = $group-> insert( 'ScrollBar', %rest_of_profile);
18
19               my $isAutoTrack = $sb-> autoTrack;
20               $sb-> autoTrack( $yesNo);
21
22               my $val = $sb-> value;
23               $sb-> value( $value);
24
25               my $min = $sb-> min;
26               my $max = $sb-> max;
27               $sb-> min( $min);
28               $sb-> max( $max);
29               $sb-> set_bounds( $min, $max);
30
31               my $step = $sb-> step;
32               my $pageStep = $sb-> pageStep;
33               $sb-> step( $step);
34               $sb-> pageStep( $pageStep);
35
36               my $partial = $sb-> partial;
37               my $whole = $sb-> whole;
38               $sb-> partial( $partial);
39               $sb-> whole( $whole);
40               $sb-> set_proportion( $partial, $whole);
41
42               my $size = $sb-> minThumbSize;
43               $sb-> minThumbSize( $size);
44
45               my $isVertical = $sb-> vertical;
46               $sb-> vertical( $yesNo);
47
48               my ($width,$height) = $sb-> get_default_size;
49

API

51   Properties
52       autoTrack BOOLEAN
53           Tells the widget if it should send "Change" notification during
54           mouse tracking events.  Generally it should only be set to 0 on
55           very slow computers.
56
57           Default value is 1 (logical true).
58
59       growMode INTEGER
60           Default value is gm::GrowHiX, i.e. the scrollbar will try to
61           maintain the constant distance from its right edge to its owner's
62           right edge as the owner changes its size.  This is useful for
63           horizontal scrollbars.
64
65       height INTEGER
66           Default value is $Prima::ScrollBar::stdMetrics[1], which is an
67           operating system dependent value determined with a call to
68           "Prima::Application-> get_default_scrollbar_metrics".  The height
69           is affected because by default the horizontal "ScrollBar" will be
70           created.
71
72       max INTEGER
73           Sets the upper limit for "value".
74
75           Default value: 100.
76
77       min INTEGER
78           Sets the lower limit for "value".
79
80           Default value: 0
81
82       minThumbSize INTEGER
83           A minimal thumb breadth in pixels. The thumb cannot have main
84           dimension lesser than this.
85
86           Default value: 21
87
88       pageStep INTEGER
89           This determines the increment/decrement to "value" during
90           "page"-related operations, for example clicking the mouse on the
91           strip outside the thumb, or pressing "PgDn" or "PgUp".
92
93           Default value: 10
94
95       partial INTEGER
96           This tells the scrollbar how many of imaginary units the thumb
97           should occupy. See "whole" below.
98
99           Default value: 10
100
101       selectable BOOLEAN
102           Default value is 0 (logical false).  If set to 1 the widget
103           receives keyboard focus; when in focus, the thumb is blinking.
104
105       step INTEGER
106           This determines the minimal increment/decrement to "value" during
107           mouse/keyboard interaction.
108
109           Default value is 1.
110
111       style STRING = [ 'xp' | 'os2 ]
112           Defines the scrollbar drawing style, that was historically
113           different on windows and the other platforms. It is possible to
114           define own styles.
115
116       value INTEGER
117           A basic scrollbar property; reflects the imaginary position between
118           "min" and "max", which corresponds directly to the position of the
119           thumb.
120
121           Default value is 0.
122
123       vertical BOOLEAN
124           Determines the main scrollbar style.  Set this to 1 when the
125           scrollbar style is vertical, 0 - horizontal. The property can be
126           changed at run-time, so the scrollbars can morph from horizontal to
127           vertical and vice versa.
128
129           Default value is 0 (logical false).
130
131       whole INTEGER
132           This tells the scrollbar how many of imaginary units correspond to
133           the whole length of the scrollbar.  This value has nothing in
134           common with "min" and "max".  You may think of the combination of
135           "partial" and "whole" as of the proportion between the visible size
136           of something (document, for example) and the whole size of that
137           "something".  Useful to struggle against infamous "bird" size of
138           Windows scrollbar thumbs.
139
140           Default value is 100.
141
142   Methods
143       get_default_size
144           Returns two integers, the default platform dependant width of a
145           vertical scrollbar and height of a horizontal scrollbar.
146
147   Events
148       Change
149           The "Change" notification is sent whenever the thumb position of
150           scrollbar is changed, subject to a certain limitations when
151           "autoTrack" is 0. The notification conforms the general Prima rule:
152           it is sent when appropriate, regardless to whether this was a
153           result of user interaction, or a side effect of some method
154           programmer has called.
155
156       Track
157           If "autoTrack" is 0, called when the user changes the thumb
158           position by the mouse instead of "Change".
159

EXAMPLE

161               use Prima;
162               use Prima::Application name => 'ScrollBar test';
163               use Prima::ScrollBar;
164
165               my $w = Prima::Window-> create(
166                       text => 'ScrollBar test',
167                       size => [300,200]);
168
169               my $sb = $w-> insert( ScrollBar =>
170                       width => 280,
171                       left => 10,
172                       bottom => 50,
173                       onChange => sub {
174                               $w-> text( $_[0]-> value);
175                       });
176
177               run Prima;
178

SEE ALSO

180       Prima, Prima::Widget, Prima::IntUtils, examples/rtc.pl,
181       examples/scrolbar.pl
182

AUTHORS

184       Dmitry Karasik <dk@plab.ku.dk>, Anton Berezin <tobez@plab.ku.dk> -
185       documentation
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189perl v5.32.1                      2021-01-27               Prima::ScrollBar(3)
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