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377 lines
12 KiB
Plaintext
377 lines
12 KiB
Plaintext
15 years ago
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#
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# Scrolledwidget
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# ----------------------------------------------------------------------
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# Implements a general purpose base class for scrolled widgets, by
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# creating the necessary horizontal and vertical scrollbars and
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# providing protected methods for controlling their display. The
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# derived class needs to take advantage of the fact that the grid
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# is used and the vertical scrollbar is in row 0, column 2 and the
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# horizontal scrollbar in row 2, column 0.
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#
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# ----------------------------------------------------------------------
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# AUTHOR: Mark Ulferts mulferts@austin.dsccc.com
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#
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# @(#) $Id: scrolledwidget.itk,v 1.2 2001/08/07 19:56:48 smithc Exp $
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# ----------------------------------------------------------------------
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# Copyright (c) 1997 DSC Technologies Corporation
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# ======================================================================
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# Permission to use, copy, modify, distribute and license this software
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# and its documentation for any purpose, and without fee or written
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# agreement with DSC, is hereby granted, provided that the above copyright
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# notice appears in all copies and that both the copyright notice and
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# warranty disclaimer below appear in supporting documentation, and that
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# the names of DSC Technologies Corporation or DSC Communications
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# Corporation not be used in advertising or publicity pertaining to the
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# software without specific, written prior permission.
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#
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# DSC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
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# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NON-
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# INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND THE
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# AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE MAINTENANCE,
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# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. IN NO EVENT SHALL
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# DSC BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
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# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION,
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# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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# SOFTWARE.
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# ======================================================================
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#
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# Usual options.
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#
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itk::usual Scrolledwidget {
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keep -background -borderwidth -cursor -highlightcolor -highlightthickness
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keep -activebackground -activerelief -jump -troughcolor
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keep -labelfont -foreground
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}
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# ------------------------------------------------------------------
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# SCROLLEDWIDGET
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# ------------------------------------------------------------------
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itcl::class iwidgets::Scrolledwidget {
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inherit iwidgets::Labeledwidget
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constructor {args} {}
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destructor {}
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itk_option define -sbwidth sbWidth Width 15
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itk_option define -scrollmargin scrollMargin ScrollMargin 3
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itk_option define -vscrollmode vscrollMode VScrollMode static
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itk_option define -hscrollmode hscrollMode HScrollMode static
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itk_option define -width width Width 30
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itk_option define -height height Height 30
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protected method _scrollWidget {wid first last}
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protected method _vertScrollbarDisplay {mode}
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protected method _horizScrollbarDisplay {mode}
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protected method _configureEvent {}
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protected variable _vmode off ;# Vertical scroll mode
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protected variable _hmode off ;# Vertical scroll mode
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protected variable _recheckHoriz 1 ;# Flag to check need for
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;# horizontal scrollbar
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protected variable _recheckVert 1 ;# Flag to check need for
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;# vertical scrollbar
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protected variable _interior {}
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}
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#
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# Provide a lowercased access method for the Scrolledwidget class.
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#
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proc ::iwidgets::scrolledwidget {pathName args} {
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uplevel ::iwidgets::Scrolledwidget $pathName $args
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}
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#
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# Use option database to override default resources of base classes.
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#
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option add *Scrolledwidget.labelPos n widgetDefault
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# ------------------------------------------------------------------
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# CONSTRUCTOR
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# ------------------------------------------------------------------
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itcl::body iwidgets::Scrolledwidget::constructor {args} {
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#
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# Turn off the borderwidth on the hull and save off the
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# interior for later use.
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#
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component hull configure -borderwidth 0
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set _interior $itk_interior
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#
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# Check if the scrollbars need mapping upon a configure event.
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#
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bind $_interior <Configure> [itcl::code $this _configureEvent]
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#
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# Turn off propagation in the containing shell.
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#
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# Due to a bug in the tk4.2 grid, we have to check the
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# propagation before setting it. Setting it to the same
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# value it already is will cause it to toggle.
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#
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if {[grid propagate $_interior]} {
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grid propagate $_interior no
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}
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#
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# Create the vertical scroll bar
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#
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itk_component add vertsb {
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scrollbar $itk_interior.vertsb -orient vertical
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} {
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usual
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keep -borderwidth -elementborderwidth -jump -relief
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rename -highlightbackground -background background Background
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}
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#
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# Create the horizontal scrollbar
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#
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itk_component add horizsb {
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scrollbar $itk_interior.horizsb -orient horizontal
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} {
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usual
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keep -borderwidth -elementborderwidth -jump -relief
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rename -highlightbackground -background background Background
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}
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#
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# Initialize the widget based on the command line options.
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#
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eval itk_initialize $args
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}
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# ------------------------------------------------------------------
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# DESTURCTOR
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# ------------------------------------------------------------------
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itcl::body iwidgets::Scrolledwidget::destructor {} {
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}
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# ------------------------------------------------------------------
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# OPTIONS
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# ------------------------------------------------------------------
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# ------------------------------------------------------------------
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# OPTION: -sbwidth
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#
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# Set the width of the scrollbars.
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# ------------------------------------------------------------------
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itcl::configbody iwidgets::Scrolledwidget::sbwidth {
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$itk_component(vertsb) configure -width $itk_option(-sbwidth)
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$itk_component(horizsb) configure -width $itk_option(-sbwidth)
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}
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# ------------------------------------------------------------------
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# OPTION: -scrollmargin
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#
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# Set the distance between the scrollbars and the list box.
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# ------------------------------------------------------------------
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itcl::configbody iwidgets::Scrolledwidget::scrollmargin {
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set pixels [winfo pixels $_interior $itk_option(-scrollmargin)]
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if {$_hmode == "on"} {
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grid rowconfigure $_interior 1 -minsize $pixels
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}
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if {$_vmode == "on"} {
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grid columnconfigure $_interior 1 -minsize $pixels
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}
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}
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# ------------------------------------------------------------------
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# OPTION: -vscrollmode
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#
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# Enable/disable display and mode of veritcal scrollbars.
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# ------------------------------------------------------------------
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itcl::configbody iwidgets::Scrolledwidget::vscrollmode {
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switch $itk_option(-vscrollmode) {
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static {
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_vertScrollbarDisplay on
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}
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dynamic -
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none {
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_vertScrollbarDisplay off
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}
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default {
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error "bad vscrollmode option\
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\"$itk_option(-vscrollmode)\": should be\
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static, dynamic, or none"
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}
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}
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}
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# ------------------------------------------------------------------
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# OPTION: -hscrollmode
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#
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# Enable/disable display and mode of horizontal scrollbars.
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# ------------------------------------------------------------------
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itcl::configbody iwidgets::Scrolledwidget::hscrollmode {
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switch $itk_option(-hscrollmode) {
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static {
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_horizScrollbarDisplay on
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}
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dynamic -
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none {
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_horizScrollbarDisplay off
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}
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default {
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error "bad hscrollmode option\
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\"$itk_option(-hscrollmode)\": should be\
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static, dynamic, or none"
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}
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}
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}
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# ------------------------------------------------------------------
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# OPTION: -width
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#
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# Specifies the width of the scrolled widget. The value may be
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# specified in any of the forms acceptable to Tk_GetPixels.
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# ------------------------------------------------------------------
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itcl::configbody iwidgets::Scrolledwidget::width {
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$_interior configure -width \
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[winfo pixels $_interior $itk_option(-width)]
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}
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# ------------------------------------------------------------------
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# OPTION: -height
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#
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# Specifies the height of the scrolled widget. The value may be
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# specified in any of the forms acceptable to Tk_GetPixels.
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# ------------------------------------------------------------------
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itcl::configbody iwidgets::Scrolledwidget::height {
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$_interior configure -height \
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[winfo pixels $_interior $itk_option(-height)]
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}
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# ------------------------------------------------------------------
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# METHODS
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# ------------------------------------------------------------------
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# ------------------------------------------------------------------
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# PROTECTED METHOD: _vertScrollbarDisplay mode
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#
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# Displays the vertical scrollbar based on the input mode.
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# ------------------------------------------------------------------
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itcl::body iwidgets::Scrolledwidget::_vertScrollbarDisplay {mode} {
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switch $mode {
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on {
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set _vmode on
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grid columnconfigure $_interior 1 -minsize \
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[winfo pixels $_interior $itk_option(-scrollmargin)]
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grid $itk_component(vertsb) -row 0 -column 2 -sticky ns
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}
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off {
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set _vmode off
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grid columnconfigure $_interior 1 -minsize 0
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grid forget $itk_component(vertsb)
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}
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default {
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error "invalid argument \"$mode\": should be on or off"
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}
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}
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}
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# ------------------------------------------------------------------
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# PROTECTED METHOD: _horizScrollbarDisplay mode
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#
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# Displays the horizontal scrollbar based on the input mode.
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# ------------------------------------------------------------------
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itcl::body iwidgets::Scrolledwidget::_horizScrollbarDisplay {mode} {
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switch $mode {
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on {
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set _hmode on
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grid rowconfigure $_interior 1 -minsize \
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[winfo pixels $_interior $itk_option(-scrollmargin)]
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grid $itk_component(horizsb) -row 2 -column 0 -sticky ew
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}
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off {
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set _hmode off
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grid rowconfigure $_interior 1 -minsize 0
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grid forget $itk_component(horizsb)
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}
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default {
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error "invalid argument \"$mode\": should be on or off"
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}
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}
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}
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# ------------------------------------------------------------------
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# PROTECTED METHOD: _scrollWidget wid first last
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#
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# Performs scrolling and display of scrollbars based on the total
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# and maximum frame size as well as the current -vscrollmode and
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# -hscrollmode settings. Parameters are automatic scroll parameters.
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# ------------------------------------------------------------------
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itcl::body iwidgets::Scrolledwidget::_scrollWidget {wid first last} {
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$wid set $first $last
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if {$wid == $itk_component(vertsb)} {
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if {$itk_option(-vscrollmode) == "dynamic"} {
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if {($_recheckVert != 1) && ($_vmode == "on")} {
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return
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} else {
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set _recheckVert 0
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}
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if {($first == 0) && ($last == 1)} {
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if {$_vmode != "off"} {
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_vertScrollbarDisplay off
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}
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} else {
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if {$_vmode != "on"} {
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_vertScrollbarDisplay on
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}
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}
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}
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} elseif {$wid == $itk_component(horizsb)} {
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if {$itk_option(-hscrollmode) == "dynamic"} {
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if {($_recheckHoriz != 1) && ($_hmode == "on")} {
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return
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} else {
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set _recheckHoriz 0
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}
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if {($first == 0) && ($last == 1)} {
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if {$_hmode != "off"} {
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_horizScrollbarDisplay off
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}
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} else {
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if {$_hmode != "on"} {
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_horizScrollbarDisplay on
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}
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}
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}
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}
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}
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# ------------------------------------------------------------------
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# PROTECTED METHOD: _configureEvent
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#
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# Resets the recheck flags which determine if we'll try and map
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# the scrollbars in dynamic mode.
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# ------------------------------------------------------------------
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itcl::body iwidgets::Scrolledwidget::_configureEvent {} {
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update idletasks
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set _recheckVert 1
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set _recheckHoriz 1
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}
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