Gtk2::Ex::AdjustmentBits -- helpers for Gtk2::Adjustment objects

 use Gtk2::Ex::AdjustmentBits;

Gtk2::Ex::AdjustmentBits::scroll_value ($adj, $amount)

Add $amount to the value in $adj, restricting the result to between lower and upper - page, as suitable for a scrollbar range etc.

Gtk2::Ex::AdjustmentBits::set_maybe ($adjustment, field => $value, ...)

Set fields in $adjustment, with changed and notify signals emitted if the values are different from what's already there. The fields are

    value
    upper
    lower
    page_size
    page_increment
    step_increment

For example

    Gtk2::Ex::AdjustmentBits::set_maybe
           ($adjustment, upper => 100.0,
                         lower => 0.0,
                         value => 50.0);

The plain field getter/setters like $adjustment->upper() don't emit any signals, and the object $adjustment->set only emits notify (or changed too in Gtk 2.18 or thereabouts). set_maybe takes care of all necessary signals and does them only after storing all the values and only if actually changed.

Not emitting signals when values are unchanged may save some work in widgets controlled by $adjustment, though a good widget might notice unchanged values itself.

Gtk2::Adjustment, Gtk2::Ex::WidgetBits

http://user42.tuxfamily.org/gtk2-ex-widgetbits/index.html

Copyright 2010, 2011 Kevin Ryde

Gtk2-Ex-WidgetBits is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version.

Gtk2-Ex-WidgetBits is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with Gtk2-Ex-WidgetBits. If not, see http://www.gnu.org/licenses/.