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#==============================================================================
# Main Scrollutil and Scrollutil_tile package module.
#
# Copyright (c) 2019-2024 Csaba Nemethi (E-mail: csaba.nemethi@t-online.de)
#==============================================================================
namespace eval ::scrollutil {
proc - {} { return [expr {$::tcl_version >= 8.5 ? "-" : ""}] }
package require Tk 8.4[-]
#
# Public variables:
#
variable version 2.4
variable library [file dirname [file normalize [info script]]]
#
# Creates a new scrollarea/scrollsync/scrollableframe/pagesman widget:
#
namespace export scrollarea scrollsync scrollableframe pagesman
#
# Queries the scrollarea/scrollsync to which a given widget belongs:
#
namespace export getscrollarea getscrollsync
#
# Public procedures for mouse wheel event handling in
# scrollable widgets and scrollable widget containers:
#
namespace export addMouseWheelSupport createWheelEventBindings \
enableScrollingByWheel disableScrollingByWheel \
adaptWheelEventHandling setFocusCheckWindow \
focusCheckWindow
}
package provide scrollutil::common $::scrollutil::version
#
# The following procedure, invoked in "scrollutil.tcl" and
# "scrollutil_tile.tcl", sets the variable ::scrollutil::usingTile
# to the given value and sets a trace on this variable.
#
proc ::scrollutil::useTile {bool} {
variable usingTile $bool
trace add variable usingTile {write unset} \
[list ::scrollutil::restoreUsingTile $bool]
}
#
# The following trace procedure is executed whenever the variable
# ::scrollutil::usingTile is written or unset. It restores the
# variable to its original value, given by the first argument.
#
proc ::scrollutil::restoreUsingTile {origVal varName index op} {
variable usingTile $origVal
switch $op {
write {
return -code error "it is not supported to use both Scrollutil and\
Scrollutil_tile in the same application"
}
unset {
trace add variable usingTile {write unset} \
[list ::scrollutil::restoreUsingTile $origVal]
}
}
}
proc ::scrollutil::createTkAliases {} {
foreach cmd {frame scrollbar} {
if {[llength [info commands ::tk::$cmd]] == 0} {
interp alias {} ::tk::$cmd {} ::$cmd
}
}
}
::scrollutil::createTkAliases
#
# Everything else needed is lazily loaded on demand, via the dispatcher
# set up in the subdirectory "scripts" (see the file "tclIndex").
#
lappend auto_path [file join $::scrollutil::library scripts]
#
# Load the packages mwutil and scaleutil from the directory
# "scripts/utils". Take into account that mwutil is also included
# in Mentry and Tablelist, and scaleutil is also included in Tablelist.
#
proc ::scrollutil::loadUtils {} {
if {[catch {package present mwutil} version] == 0 &&
[package vcompare $version 2.23] < 0} {
package forget mwutil
}
package require mwutil 2.23[-]
if {[catch {package present scaleutil} version] == 0 &&
[package vcompare $version 1.14.1] < 0} {
package forget scaleutil
}
package require scaleutil 1.14.1[-]
}
::scrollutil::loadUtils
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