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scrolledframe.itk
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1999-02-24
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#
# Scrolledframe
# ----------------------------------------------------------------------
# Implements horizontal and vertical scrollbars around a childsite
# frame. Includes options to control display of scrollbars.
#
# ----------------------------------------------------------------------
# AUTHOR: Sue Yockey syockey@spd.dsccc.com
# Mark Ulferts mulferts@spd.dsccc.com
#
# @(#) $Id: scrolledframe.itk,v 1.1 1998/07/27 18:49:48 stanton Exp $
# ----------------------------------------------------------------------
# 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.
# ======================================================================
#
# Default resources.
#
option add *Scrolledframe.borderWidth 2 widgetDefault
option add *Scrolledframe.relief sunken widgetDefault
option add *Scrolledframe.scrollMargin 3 widgetDefault
option add *Scrolledframe.vscrollMode static widgetDefault
option add *Scrolledframe.hscrollMode static widgetDefault
option add *Scrolledframe.width 100 widgetDefault
option add *Scrolledframe.height 100 widgetDefault
option add *Scrolledframe.labelPos n widgetDefault
#
# Usual options.
#
itk::usual Scrolledframe {
keep -activebackground -activerelief -background -borderwidth -cursor \
-elementborderwidth -foreground -highlightcolor -highlightthickness \
-jump -labelfont -troughcolor
}
# ------------------------------------------------------------------
# SCROLLEDFRAME
# ------------------------------------------------------------------
class iwidgets::Scrolledframe {
inherit iwidgets::Labeledwidget
constructor {args} {}
destructor {}
itk_option define -sbwidth sbWidth Width 15
itk_option define -scrollmargin scrollMargin ScrollMargin 3
itk_option define -vscrollmode vscrollMode VScrollMode static
itk_option define -hscrollmode hscrollMode HScrollMode static
itk_option define -width width Width 30
itk_option define -height height Height 30
public method childsite {}
public method justify {direction}
public method xview {args}
public method yview {args}
protected method _configureCanvas {}
protected method _configureFrame {}
protected method _scrollFrame {wid first last}
protected method _updateFiller {}
protected method _configureFiller {}
private method _fillerWidth {}
private method _horizScrollbarDisplay {mode}
private method _vertScrollbarDisplay {mode}
protected variable _vmode off ;# Vertical scroll mode
protected variable _hmode off ;# Vertical scroll mode
protected variable _reconfigPlanned "" ;# non-null, filler update pending
private variable _initialized 0 ;# Initialization flag.
}
#
# Provide a lowercased access method for the Scrolledframe class.
#
proc ::iwidgets::scrolledframe {pathName args} {
uplevel ::iwidgets::Scrolledframe $pathName $args
}
# ------------------------------------------------------------------
# CONSTRUCTOR
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::constructor {args} {
component hull configure -borderwidth 0
pack propagate $itk_component(shell) no
#
# Create some frames to hold both the top and bottom halves of
# the widget. The top will contain both the canvas and vertical
# scrollbar. The bottom houses the horizontal scrollbar and
# some filler.
#
itk_component add topFrame {
frame $itk_interior.topFrame
} {
keep -background -cursor
}
pack $itk_component(topFrame) -fill both -expand yes
#
# Frame around horizontal scrollbar
#
itk_component add bottomHalf {
frame $itk_component(topFrame).bottomHalf
} {
keep -background -cursor
}
pack $itk_component(bottomHalf) -fill x -side bottom
#
# Frame for horizontal margin between scrolled area & scrollbar
#
itk_component add hMargin {
frame $itk_component(topFrame).hMargin
} {
keep -background -cursor
}
pack $itk_component(hMargin) -side bottom
#
# Frame around canvas and vertical scrollbar
#
itk_component add topHalf {
frame $itk_component(topFrame).topHalf
} {
keep -background -cursor
}
pack $itk_component(topHalf) -fill both -expand yes
#
# Create a frame for the canvas to provide relief for the canvas.
#
itk_component add canvasFrame {
frame $itk_component(topHalf).canvasFrame \
-relief sunken -borderwidth 2
} {
keep -background -borderwidth -cursor -relief
}
#
# Create a canvas to scroll
#
itk_component add scrCanvas {
canvas $itk_component(canvasFrame).scrCanvas \
-height 1.0 -width 1.0 \
-scrollregion "0 0 1 1" \
-highlightthickness 0 \
-borderwidth 0 -relief flat \
-xscrollcommand \
[code $this _scrollFrame $itk_component(bottomHalf).hSB] \
-yscrollcommand \
[code $this _scrollFrame $itk_component(topHalf).vSB]
} {
keep -background -cursor
}
pack $itk_component(scrCanvas) -fill both -expand yes
bind $itk_component(scrCanvas) <Configure> [code $this _configureCanvas]
#
# Create a Frame inside canvas to hold widgets to be scrolled
#
itk_component add scrFrame {
frame $itk_component(scrCanvas).scrFrame
} {
keep -background -cursor
}
pack $itk_component(scrFrame) -fill both -expand yes
$itk_component(scrCanvas) create window 1 1 -tags frameTag \
-window $itk_component(scrFrame) -anchor nw
set itk_interior $itk_component(scrFrame)
bind $itk_component(scrFrame) <Configure> [code $this _configureFrame]
#
# Create frame for the vertical margin between the scrolling
# area and the scrollbar.
#
itk_component add vMargin {
frame $itk_component(topHalf).vMargin -width 0
} {
keep -background -cursor
}
#
# Create the vertical scroll bar.
#
itk_component add vSB {
scrollbar $itk_component(topHalf).vSB -orient vertical \
-command [code $itk_component(scrCanvas) yview]
} {
keep -activebackground -activerelief -background -borderwidth \
-cursor -elementborderwidth \
-highlightcolor -jump -highlightthickness -relief \
-repeatdelay -repeatinterval -troughcolor
rename -highlightbackground -background background Background
}
pack $itk_component(vSB) -side right -fill y
pack $itk_component(vMargin) -side right
pack $itk_component(canvasFrame) -fill both -expand yes -side left
#
# Create the horizontal scrollbar.
#
itk_component add hSB {
scrollbar $itk_component(bottomHalf).hSB -orient horizontal \
-command [code $itk_component(scrCanvas) xview]
} {
keep -activebackground -activerelief -background -borderwidth \
-cursor -elementborderwidth \
-highlightcolor -jump -highlightthickness -relief \
-repeatdelay -repeatinterval -troughcolor
rename -highlightbackground -background background Background
}
pack $itk_component(hSB) -side left -fill x -expand yes
#
# Create the filler frame and compute its width.
#
itk_component add filler {
frame $itk_component(bottomHalf).filler -width [_fillerWidth]
} {
keep -background -cursor
}
pack $itk_component(filler) -side right
#
# Explicitly handle configs that may have been ignored earlier.
#
eval itk_initialize $args
bind $itk_component(hMargin) <Configure> [code $this _configureFiller]
bind $itk_component(vSB) <Configure> [code $this _configureFiller]
bind $itk_component(vMargin) <Configure> [code $this _configureFiller]
bind $itk_component(hSB) <Configure> [code $this _configureFiller]
set _initialized 1
configure -scrollmargin $itk_option(-scrollmargin)
}
# ------------------------------------------------------------------
# DESTURCTOR
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::destructor {} {
if {$_reconfigPlanned != ""} {after cancel $_reconfigPlanned}
}
# ------------------------------------------------------------------
# OPTIONS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# OPTION: -sbwidth
#
# Set the width of the scrollbars.
# ------------------------------------------------------------------
configbody iwidgets::Scrolledframe::sbwidth {
if {$_initialized} {
$itk_component(vSB) configure -width $itk_option(-sbwidth)
$itk_component(hSB) configure -width $itk_option(-sbwidth)
}
}
# ------------------------------------------------------------------
# OPTION: -scrollmargin
#
# Set the distance between the scrollbars and the canvas.
# ------------------------------------------------------------------
configbody iwidgets::Scrolledframe::scrollmargin {
if {$_initialized} {
set pixels [winfo pixels $itk_component(hMargin) \
$itk_option(-scrollmargin)]
if {$_hmode == "on"} {
$itk_component(hMargin) config -width 1 -height $pixels
}
if {$_vmode == "on"} {
$itk_component(vMargin) config -width $pixels -height 1
}
$itk_component(filler) config -width [_fillerWidth] -height 1
}
}
# ------------------------------------------------------------------
# OPTION: -vscrollmode
#
# Enable/disable display and mode of veritcal scrollbars.
# ------------------------------------------------------------------
configbody iwidgets::Scrolledframe::vscrollmode {
switch $itk_option(-vscrollmode) {
static {
_vertScrollbarDisplay on
}
dynamic -
none {
_vertScrollbarDisplay off
}
default {
error "bad vscrollmode option\
\"$itk_option(-vscrollmode)\": should be\
static, dynamic, or none"
}
}
}
# ------------------------------------------------------------------
# OPTION: -hscrollmode
#
# Enable/disable display and mode of horizontal scrollbars.
# ------------------------------------------------------------------
configbody iwidgets::Scrolledframe::hscrollmode {
switch $itk_option(-hscrollmode) {
static {
_horizScrollbarDisplay on
}
dynamic -
none {
_horizScrollbarDisplay off
}
default {
error "bad hscrollmode option\
\"$itk_option(-hscrollmode)\": should be\
static, dynamic, or none"
}
}
}
# ------------------------------------------------------------------
# OPTION: -width
#
# Specifies the width of the scrolled frame. The value may be
# specified in any of the forms acceptable to Tk_GetPixels.
# ------------------------------------------------------------------
configbody iwidgets::Scrolledframe::width {
set pixels \
[winfo pixels $itk_component(shell) $itk_option(-width)]
$itk_component(shell) config -width $pixels
}
# ------------------------------------------------------------------
# OPTION: -height
#
# Specifies the height of the scrolled frame. The value may be
# specified in any of the forms acceptable to Tk_GetPixels.
# ------------------------------------------------------------------
configbody iwidgets::Scrolledframe::height {
set pixels \
[winfo pixels $itk_component(shell) $itk_option(-height)]
$itk_component(shell) config -height $pixels
}
# ------------------------------------------------------------------
# METHODS
# ------------------------------------------------------------------
# ------------------------------------------------------------------
# METHOD: childsite
#
# Returns the path name of the child site widget.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::childsite {} {
return $itk_component(scrFrame)
}
# ------------------------------------------------------------------
# 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(scrCanvas)]} {
update idletasks
switch $direction {
left {
$itk_component(scrCanvas) xview moveto 0
}
right {
$itk_component(scrCanvas) xview moveto 1
}
top {
$itk_component(scrCanvas) yview moveto 0
}
bottom {
$itk_component(scrCanvas) yview moveto 1
}
default {
error "bad justify argument \"$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(scrCanvas) 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(scrCanvas) 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(scrCanvas) cget -scrollregion]
set srw [lindex $sr 2]
set srh [lindex $sr 3]
$itk_component(scrFrame) 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 {} {
$itk_component(scrCanvas) configure \
-scrollregion [$itk_component(scrCanvas) bbox frameTag]
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _fillerWidth
#
# Compute the width of the filler frame based on the vertical
# scrollbar width plus the margin.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_fillerWidth {} {
if {$_vmode == "on"} {
return [expr [winfo reqwidth $itk_component(vSB)] + \
[winfo reqwidth $itk_component(vMargin)]]
} else {
return 1
}
}
# ------------------------------------------------------------------
# PROTECTED METHOD: _configureFiller
#
# Set up to do an update of the filler if one is not all ready
# planned.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_configureFiller {} {
if {$_reconfigPlanned == ""} {
set _reconfigPlanned [after idle [code $this _updateFiller]]
}
}
# ------------------------------------------------------------------
# PROTECTED METHOD: _updateFiller
#
# Update the width of the filler following a configure event on
# a scrollbar or margin.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_updateFiller {} {
$itk_component(filler) config -width [_fillerWidth] -height 1
set _reconfigPlanned ""
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _horizScrollbarDisplay
#
# Displays the horizontal scrollbar based on the input mode.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_horizScrollbarDisplay {mode} {
switch $mode {
on {
set _hmode on
$itk_component(hMargin) config -width 1 -height \
[winfo pixels $itk_component(hMargin) \
$itk_option(-scrollmargin)]
pack $itk_component(hSB) -side left -fill x -expand yes
}
off {
set _hmode off
pack forget $itk_component(hSB)
$itk_component(hMargin) config -width 1 -height 1
$itk_component(filler) config -width 1 -height 1
}
default {
error "invalid argument \"$mode\": should be on or off"
}
}
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _vertScrollbarDisplay
#
# Displays the vertical scrollbar based on the input mode.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_vertScrollbarDisplay {mode} {
switch $mode {
on {
set _vmode on
$itk_component(vMargin) config -height 1 -width \
[winfo pixels $itk_component(vMargin) \
$itk_option(-scrollmargin)]
pack forget $itk_component(canvasFrame)
pack forget $itk_component(vMargin)
pack $itk_component(vSB) -side right -fill y
pack $itk_component(vMargin) -side right
pack $itk_component(canvasFrame) -fill both -expand yes -side left
}
off {
set _vmode off
pack forget $itk_component(vSB)
$itk_component(vMargin) config -width 1 -height 1
$itk_component(filler) config -width 1 -height 1
}
default {
error "invalid argument \"$mode\": should be on or off"
}
}
}
# ------------------------------------------------------------------
# PRIVATE METHOD: _scrollFrame
#
# Performs scrolling and display of scrollbars based on the total
# and maximum frame size as well as the current -vscrollmode and
# -hscrollmode settings. Parameters are automatic scroll parameters.
# ------------------------------------------------------------------
body iwidgets::Scrolledframe::_scrollFrame {wid first last} {
$wid set $first $last
if {$wid == $itk_component(vSB)} {
if {$itk_option(-vscrollmode) == "dynamic"} {
if {($first == 0) && ($last == 1)} {
if {$_vmode != "off"} {
_vertScrollbarDisplay off
}
} else {
if {$_vmode != "on"} {
_vertScrollbarDisplay on
}
}
}
} elseif {$wid == $itk_component(hSB)} {
if {$itk_option(-hscrollmode) == "dynamic"} {
if {($first == 0) && ($last == 1)} {
if {$_hmode != "off"} {
_horizScrollbarDisplay off
}
} else {
if {$_hmode != "on"} {
_horizScrollbarDisplay on
}
}
}
}
}