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set rcsId {$Id: scroll.tcl,v 2.7 2000/11/01 12:00:50 jfontain Exp $}
# generic scroll widget with automatic scrollbars for scrolling widgets with the common tk scroll interface
class scroll {
proc scroll {this scrollableClass parentPath args} composite {[new frame $parentPath] $args} {
variable ${this}first
variable ${this}last
# scrollable class widget must accept the -[xy]scrollcommand options and [xy]view commands, such as canvas, text, table, ...
set path $widget::($this,path)
composite::manage $this [new $scrollableClass $path] scrolled\
[new scrollbar $path -orient horizontal -highlightthickness 0] horizontal\
[new scrollbar $path -highlightthickness 0] vertical [new frame $path] filler
widget::configure $composite::($this,scrolled)\
-xscrollcommand "scroll::update $this 1 0" -yscrollcommand "scroll::update $this 0 1"
widget::configure $composite::($this,horizontal) -command "$composite::($this,scrolled,path) xview"
widget::configure $composite::($this,vertical) -command "$composite::($this,scrolled,path) yview"
grid propagate $widget::($this,path) 0 ;# turn off propagation so that setting width and height is possible
grid $composite::($this,scrolled,path) -sticky nsew -ipadx 0
grid rowconfigure $path 0 -weight 1
grid columnconfigure $path 0 -weight 1
set ($this,0,1,path) $composite::($this,vertical,path)
set ($this,1,0,path) $composite::($this,horizontal,path)
set ($this,0,1,map) 1
set ($this,1,0,map) 1
for {set index -1} {$index>=-3} {incr index -1} {
set ${this}first(0,1,$index) -2147483648
set ${this}last(0,1,$index) -2147483648
set ${this}first(1,0,$index) -2147483648
set ${this}last(1,0,$index) -2147483648
}
composite::complete $this
}
proc ~scroll {this} {}
proc options {this} {
return [list\
[list -automatic 1 1]\
[list -scrollbarborderwidth $widget::option(scrollbar,borderwidth) $widget::option(scrollbar,borderwidth)]\
[list\
-scrollbarelementborderwidth\
$widget::option(scrollbar,elementborderwidth) $widget::option(scrollbar,elementborderwidth)\
]\
[list -scrollbarwidth $widget::option(scrollbar,width) $widget::option(scrollbar,width)]\
[list -height $widget::option(canvas,height)]\
[list -horizontal $($this,1,0,map) $($this,1,0,map)]\
[list -vertical $($this,0,1,map) $($this,0,1,map)]\
[list -width $widget::option(canvas,width)]\
]
}
proc set-automatic {this value} {
if {$composite::($this,complete)} {
error {option -automatic cannot be set dynamically}
}
}
proc set-horizontal {this value} {
if {$composite::($this,complete)} {
error {option -horizontal cannot be set dynamically}
}
set ($this,1,0,map) $value
}
proc set-vertical {this value} {
if {$composite::($this,complete)} {
error {option -vertical cannot be set dynamically}
}
set ($this,0,1,map) $value
}
foreach option {borderwidth elementborderwidth width} {
proc set-scrollbar$option {this value} "
\$composite::(\$this,vertical,path) configure -$option \$value
\$composite::(\$this,horizontal,path) configure -$option \$value
"
}
proc set-height {this value} {
$widget::($this,path) configure -height $value
}
proc set-width {this value} {
$widget::($this,path) configure -width $value
}
proc update {this row column first last} {
set path $($this,$row,$column,path)
foreach {previousFirst previousLast} [$path get] {}
if {($first==$previousFirst)&&($last==$previousLast)} return ;# no change
$path set $first $last ;# always set so that get always return valid values
set visible [llength [grid info $path]]
if {[repetition $this $row $column $first $last]||!$composite::($this,-automatic)||(($last-$first)<1)} {
# map scrollbar to kill a starting vibration
if {!$visible&&$($this,$row,$column,map)} {
grid $path -row $row -column $column -sticky nsew
grid $composite::($this,filler,path) -sticky nsew -column 1 -row 1
}
} else {
grid remove $path
set visible [llength [grid info $($this,$column,$row,path)]] ;# look at other scrollbar
if {!$visible} {
grid remove $composite::($this,filler,path)
}
}
}
proc repetition {this row column first last} {
variable ${this}first
variable ${this}last
set return [expr {\
($first==[set ${this}first($row,$column,-2)])&&\
($last==[set ${this}last($row,$column,-2)])&&\
([set ${this}first($row,$column,-1)]==[set ${this}first($row,$column,-3)])&&\
([set ${this}last($row,$column,-1)]==[set ${this}last($row,$column,-3)])\
}]
set ${this}first($row,$column,-3) [set ${this}first($row,$column,-2)]
set ${this}last($row,$column,-3) [set ${this}last($row,$column,-2)]
set ${this}first($row,$column,-2) [set ${this}first($row,$column,-1)]
set ${this}last($row,$column,-2) [set ${this}last($row,$column,-1)]
set ${this}first($row,$column,-1) $first
set ${this}last($row,$column,-1) $last
return $return
}
}
|
