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#
# Scrolledframe
# ----------------------------------------------------------------------
# Implements horizontal and vertical scrollbars around a childsite
# frame. Includes options to control display of scrollbars.
#
# ----------------------------------------------------------------------
# AUTHOR: Mark Ulferts mulferts@austin.dsccc.com
#
# @(#) $Id$
# ----------------------------------------------------------------------
# Copyright (c) 1995 DSC Technologies Corporation
# ======================================================================
# Permission to use, copy, modify, distribute and license this software
# and its documentation for any purpose, and without fee or written
# agreement with DSC, is hereby granted, provided that the above copyright
# notice appears in all copies and that both the copyright notice and
# warranty disclaimer below appear in supporting documentation, and that
# the names of DSC Technologies Corporation or DSC Communications
# Corporation not be used in advertising or publicity pertaining to the
# software without specific, written prior permission.
#
# DSC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
# ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NON-
# INFRINGEMENT. THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, AND THE
# AUTHORS AND DISTRIBUTORS HAVE NO OBLIGATION TO PROVIDE MAINTENANCE,
# SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. IN NO EVENT SHALL
# DSC BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
# ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTUOUS ACTION,
# ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
# SOFTWARE.
# ======================================================================
#
# Usual options.
#
itk::usual Scrolledframe {
keep -activebackground -activerelief -background -borderwidth -cursor \
-elementborderwidth -foreground -highlightcolor -highlightthickness \
-jump -labelfont -troughcolor
}
# ------------------------------------------------------------------
# SCROLLEDFRAME
# ------------------------------------------------------------------
class iwidgets::Scrolledframe {
inherit iwidgets::Scrolledwidget
constructor {args} {}
destructor {}
public method childsite {}
public method justify {direction}
public method xview {args}
public method yview {args}
protected method _configureCanvas {}
protected method _configureFrame {}
}
#
# Provide a lowercased access method for the Scrolledframe class.
#
proc ::iwidgets::scrolledframe {pathName args} {
uplevel ::iwidgets::Scrolledframe $pathName $args
}
#
# Use option database to override default resources of base classes.
#
option add *Scrolledframe.width 100 widgetDefault
option add *Scrolledframe.height 100 widgetDefault
option add *Scrolledframe.labelPos n widgetDefault
# ------------------------------------------------------------------
# CONSTRUCTOR
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::constructor {args} {
itk_option remove iwidgets::Labeledwidget::state
#
# Create a clipping frame which will provide the border for
# relief display.
#
itk_component add clipper {
frame $itk_interior.clipper
} {
usual
keep -borderwidth -relief
}
grid $itk_component(clipper) -row 1 -column 1 -sticky nsew
grid rowconfigure $_interior 1 -weight 1
grid columnconfigure $_interior 1 -weight 1
#
# Create a canvas to scroll
#
itk_component add canvas {
canvas $itk_component(clipper).canvas \
-height 1.0 -width 1.0 \
-scrollregion "0 0 1 1" \
-xscrollcommand \
[code $this _scrollWidget $itk_interior.horizsb] \
-yscrollcommand \
[code $this _scrollWidget $itk_interior.vertsb] \
-highlightthickness 0 -takefocus 0
} {
ignore -highlightcolor -highlightthickness
keep -background -cursor
}
grid $itk_component(canvas) -row 0 -column 0 -sticky nsew
grid rowconfigure $itk_component(clipper) 0 -weight 1
grid columnconfigure $itk_component(clipper) 0 -weight 1
#
# Configure the command on the vertical scroll bar in the base class.
#
$itk_component(vertsb) configure \
-command [code $itk_component(canvas) yview]
#
# Configure the command on the horizontal scroll bar in the base class.
#
$itk_component(horizsb) configure \
-command [code $itk_component(canvas) xview]
#
# Handle configure events on the canvas to adjust the frame size
# according to the scrollregion.
#
bind $itk_component(canvas) <Configure> [code $this _configureCanvas]
#
# Create a Frame inside canvas to hold widgets to be scrolled
#
itk_component add -protected sfchildsite {
frame $itk_component(canvas).sfchildsite
} {
keep -background -cursor
}
pack $itk_component(sfchildsite) -fill both -expand yes
$itk_component(canvas) create window 0 0 -tags frameTag \
-window $itk_component(sfchildsite) -anchor nw
set itk_interior $itk_component(sfchildsite)
bind $itk_component(sfchildsite) <Configure> [code $this _configureFrame]
#
# Initialize the widget based on the command line options.
#
eval itk_initialize $args
}
# ------------------------------------------------------------------
# DESTURCTOR
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::destructor {} {
}
# ------------------------------------------------------------------
# METHODS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# METHOD: childsite
#
# Returns the path name of the child site widget.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::childsite {} {
return $itk_component(sfchildsite)
}
# ------------------------------------------------------------------
# METHOD: justify
#
# Justifies the scrolled region in one of four directions: top,
# bottom, left, or right.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::justify {direction} {
if {[winfo ismapped $itk_component(canvas)]} {
update idletasks
switch $direction {
left {
$itk_component(canvas) xview moveto 0
}
right {
$itk_component(canvas) xview moveto 1
}
top {
$itk_component(canvas) yview moveto 0
}
bottom {
$itk_component(canvas) yview moveto 1
}
default {
error "bad justify argument \"$direction\": should be\
left, right, top, or bottom"
}
}
}
}
# ------------------------------------------------------------------
# METHOD: xview index
#
# Adjust the view in the frame so that character position index
# is displayed at the left edge of the widget.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::xview {args} {
return [eval $itk_component(canvas) xview $args]
}
# ------------------------------------------------------------------
# METHOD: yview index
#
# Adjust the view in the frame so that character position index
# is displayed at the top edge of the widget.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::yview {args} {
return [eval $itk_component(canvas) yview $args]
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _configureCanvas
#
# Responds to configure events on the canvas widget. When canvas
# changes size, adjust frame size.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_configureCanvas {} {
set sr [$itk_component(canvas) cget -scrollregion]
set srw [lindex $sr 2]
set srh [lindex $sr 3]
$itk_component(sfchildsite) configure -height $srh -width $srw
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _configureFrame
#
# Responds to configure events on the frame widget. When the frame
# changes size, adjust scrolling region size.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_configureFrame {} {
$itk_component(canvas) configure \
-scrollregion [$itk_component(canvas) bbox frameTag]
}
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