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# incremental search panel
# based on code from gitk, Copyright (C) Paul Mackerras
class searchbar {
field w
field ctext
field searchstring {}
field casesensitive 1
field searchdirn -forwards
field smarktop
field smarkbot
constructor new {i_w i_text args} {
set w $i_w
set ctext $i_text
frame $w
label $w.l -text [mc Find:]
button $w.bn -text [mc Next] -command [cb find_next]
button $w.bp -text [mc Prev] -command [cb find_prev]
checkbutton $w.cs -text [mc Case-Sensitive] \
-variable ${__this}::casesensitive -command [cb _incrsearch]
entry $w.ent -textvariable ${__this}::searchstring -background lightgreen
pack $w.l -side left
pack $w.cs -side right
pack $w.bp -side right
pack $w.bn -side right
pack $w.ent -side left -expand 1 -fill x
eval grid conf $w -sticky we $args
grid remove $w
trace add variable searchstring write [cb _incrsearch_cb]
bind $w <Destroy> [cb delete_this]
return $this
}
method show {} {
if {![winfo ismapped $w]} {
grid $w
}
focus -force $w.ent
}
method hide {} {
if {[winfo ismapped $w]} {
focus $ctext
grid remove $w
}
}
method _get_new_anchor {} {
# use start of selection if it is visible,
# or the bounds of the visible area
set top [$ctext index @0,0]
set bottom [$ctext index @0,[winfo height $ctext]]
set sel [$ctext tag ranges sel]
if {$sel ne {}} {
set spos [lindex $sel 0]
if {[lindex $spos 0] >= [lindex $top 0] &&
[lindex $spos 0] <= [lindex $bottom 0]} {
return $spos
}
}
if {$searchdirn eq "-forwards"} {
return $top
} else {
return $bottom
}
}
method _get_wrap_anchor {dir} {
if {$dir eq "-forwards"} {
return 1.0
} else {
return end
}
}
method _do_search {start {mlenvar {}} {dir {}} {endbound {}}} {
set cmd [list $ctext search]
if {$mlenvar ne {}} {
upvar $mlenvar mlen
lappend cmd -count mlen
}
if {!$casesensitive} {
lappend cmd -nocase
}
if {$dir eq {}} {
set dir $searchdirn
}
lappend cmd $dir -- $searchstring
if {$endbound ne {}} {
set here [eval $cmd [list $start] [list $endbound]]
} else {
set here [eval $cmd [list $start]]
if {$here eq {}} {
set here [eval $cmd [_get_wrap_anchor $this $dir]]
}
}
return $here
}
method _incrsearch_cb {name ix op} {
after idle [cb _incrsearch]
}
method _incrsearch {} {
$ctext tag remove found 1.0 end
if {[catch {$ctext index anchor}]} {
$ctext mark set anchor [_get_new_anchor $this]
}
if {$searchstring ne {}} {
set here [_do_search $this anchor mlen]
if {$here ne {}} {
$ctext see $here
$ctext tag remove sel 1.0 end
$ctext tag add sel $here "$here + $mlen c"
$w.ent configure -background lightgreen
_set_marks $this 1
} else {
$w.ent configure -background lightpink
}
}
}
method find_prev {} {
find_next $this -backwards
}
method find_next {{dir -forwards}} {
focus $w.ent
$w.ent icursor end
set searchdirn $dir
$ctext mark unset anchor
if {$searchstring ne {}} {
set start [_get_new_anchor $this]
if {$dir eq "-forwards"} {
set start "$start + 1c"
}
set match [_do_search $this $start mlen]
$ctext tag remove sel 1.0 end
if {$match ne {}} {
$ctext see $match
$ctext tag add sel $match "$match + $mlen c"
}
}
}
method _mark_range {first last} {
set mend $first.0
while {1} {
set match [_do_search $this $mend mlen -forwards $last.end]
if {$match eq {}} break
set mend "$match + $mlen c"
$ctext tag add found $match $mend
}
}
method _set_marks {doall} {
set topline [lindex [split [$ctext index @0,0] .] 0]
set botline [lindex [split [$ctext index @0,[winfo height $ctext]] .] 0]
if {$doall || $botline < $smarktop || $topline > $smarkbot} {
# no overlap with previous
_mark_range $this $topline $botline
set smarktop $topline
set smarkbot $botline
} else {
if {$topline < $smarktop} {
_mark_range $this $topline [expr {$smarktop-1}]
set smarktop $topline
}
if {$botline > $smarkbot} {
_mark_range $this [expr {$smarkbot+1}] $botline
set smarkbot $botline
}
}
}
method scrolled {} {
if {$searchstring ne {}} {
after idle [cb _set_marks 0]
}
}
}
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