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.\" ========================================================================
.\"
.IX Title "Padre::Wx::ScrollLock 3pm"
.TH Padre::Wx::ScrollLock 3pm "2012-06-27" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Padre::Wx::ScrollLock \- Lock objects to prevent unintended scrolling
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&  SCOPE: {
\&      my $lock = $padre_wx_treectrl\->lock_scroll;
\&  
\&      # Change the tree here
\&  }
\&  
\&  # The tree will unlock before here
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
By default several Wx objects will auto-scroll to the location of an
expand event or similar actions, as if it had been triggered by a human.
.PP
This class provides an implementation of a \*(L"scroll lock\*(R" for short-lived
sections of fully self-contained code that will be updating the structure
or content of a tree control or other scrolling object.
.PP
When created, the lock will create a Wx update locker for speed and flicker
free changes to the object. It will also remember the current scroll
position of the object.
.PP
When destroyed, the lock will move the scroll position back to the original
location if it has been changed in the process of an operation and then
release the update lock.
.PP
The result is that all operations on the object should occur with the
tree appearing to stay fixed in place.
.PP
Note that the lock \s-1MUST\s0 be short-lived, as it does not integrate with
the rest of Padre's locking system. You should already have all the data
needed to change the object prepared and ready to go before you create the
lock.
.SH "TODO"
.IX Header "TODO"
Find a way to prevent scrolling in native Wx and remove this class
entirely. This whole exercise feels like a bit of a waste of time,
because it emulates a more simple behaviour out of complex behaviour
just because we can't disable the complex behaviour.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2008\-2012 The Padre development team as listed in Padre.pm.
.SH "LICENSE"
.IX Header "LICENSE"
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl 5 itself.