lib/search.tcl

   1 # incremental search panel
   2 # based on code from gitk, Copyright (C) Paul Mackerras
   3
   4 class searchbar {
   5
   6 field w
   7 field ctext
   8
   9 field searchstring   {}
  10 field casesensitive  1
  11 field searchdirn     -forwards
  12
  13 field smarktop
  14 field smarkbot
  15
  16 constructor new {i_w i_text args} {
  17         set w      $i_w
  18         set ctext  $i_text
  19
  20         frame  $w
  21         label  $w.l       -text [mc Find:]
  22         button $w.bn      -text [mc Next] -command [cb find_next]
  23         button $w.bp      -text [mc Prev] -command [cb find_prev]
  24         checkbutton $w.cs -text [mc Case-Sensitive] \
  25                 -variable ${__this}::casesensitive -command [cb _incrsearch]
  26         entry  $w.ent -textvariable ${__this}::searchstring -background lightgreen
  27         pack   $w.l   -side left
  28         pack   $w.cs  -side right
  29         pack   $w.bp  -side right
  30         pack   $w.bn  -side right
  31         pack   $w.ent -side left -expand 1 -fill x
  32
  33         eval grid conf $w -sticky we $args
  34         grid remove $w
  35
  36         trace add variable searchstring write [cb _incrsearch_cb]
  37
  38         bind $w <Destroy> [cb delete_this]
  39         return $this
  40 }
  41
  42 method show {} {
  43         if {![winfo ismapped $w]} {
  44                 grid $w
  45         }
  46         focus -force $w.ent
  47 }
  48
  49 method hide {} {
  50         if {[winfo ismapped $w]} {
  51                 focus $ctext
  52                 grid remove $w
  53         }
  54 }
  55
  56 method _get_new_anchor {} {
  57         # use start of selection if it is visible,
  58         # or the bounds of the visible area
  59         set top    [$ctext index @0,0]
  60         set bottom [$ctext index @0,[winfo height $ctext]]
  61         set sel    [$ctext tag ranges sel]
  62         if {$sel ne {}} {
  63                 set spos [lindex $sel 0]
  64                 if {[lindex $spos 0] >= [lindex $top 0] &&
  65                     [lindex $spos 0] <= [lindex $bottom 0]} {
  66                         return $spos
  67                 }
  68         }
  69         if {$searchdirn eq "-forwards"} {
  70                 return $top
  71         } else {
  72                 return $bottom
  73         }
  74 }
  75
  76 method _get_wrap_anchor {dir} {
  77         if {$dir eq "-forwards"} {
  78                 return 1.0
  79         } else {
  80                 return end
  81         }
  82 }
  83
  84 method _do_search {start {mlenvar {}} {dir {}} {endbound {}}} {
  85         set cmd [list $ctext search]
  86         if {$mlenvar ne {}} {
  87                 upvar $mlenvar mlen
  88                 lappend cmd -count mlen
  89         }
  90         if {!$casesensitive} {
  91                 lappend cmd -nocase
  92         }
  93         if {$dir eq {}} {
  94                 set dir $searchdirn
  95         }
  96         lappend cmd $dir -- $searchstring
  97         if {$endbound ne {}} {
  98                 set here [eval $cmd [list $start] [list $endbound]]
  99         } else {
 100                 set here [eval $cmd [list $start]]
 101                 if {$here eq {}} {
 102                         set here [eval $cmd [_get_wrap_anchor $this $dir]]
 103                 }
 104         }
 105         return $here
 106 }
 107
 108 method _incrsearch_cb {name ix op} {
 109         after idle [cb _incrsearch]
 110 }
 111
 112 method _incrsearch {} {
 113         $ctext tag remove found 1.0 end
 114         if {[catch {$ctext index anchor}]} {
 115                 $ctext mark set anchor [_get_new_anchor $this]
 116         }
 117         if {$searchstring ne {}} {
 118                 set here [_do_search $this anchor mlen]
 119                 if {$here ne {}} {
 120                         $ctext see $here
 121                         $ctext tag remove sel 1.0 end
 122                         $ctext tag add sel $here "$here + $mlen c"
 123                         $w.ent configure -background lightgreen
 124                         _set_marks $this 1
 125                 } else {
 126                         $w.ent configure -background lightpink
 127                 }
 128         }
 129 }
 130
 131 method find_prev {} {
 132         find_next $this -backwards
 133 }
 134
 135 method find_next {{dir -forwards}} {
 136         focus $w.ent
 137         $w.ent icursor end
 138         set searchdirn $dir
 139         $ctext mark unset anchor
 140         if {$searchstring ne {}} {
 141                 set start [_get_new_anchor $this]
 142                 if {$dir eq "-forwards"} {
 143                         set start "$start + 1c"
 144                 }
 145                 set match [_do_search $this $start mlen]
 146                 $ctext tag remove sel 1.0 end
 147                 if {$match ne {}} {
 148                         $ctext see $match
 149                         $ctext tag add sel $match "$match + $mlen c"
 150                 }
 151         }
 152 }
 153
 154 method _mark_range {first last} {
 155         set mend $first.0
 156         while {1} {
 157                 set match [_do_search $this $mend mlen -forwards $last.end]
 158                 if {$match eq {}} break
 159                 set mend "$match + $mlen c"
 160                 $ctext tag add found $match $mend
 161         }
 162 }
 163
 164 method _set_marks {doall} {
 165         set topline [lindex [split [$ctext index @0,0] .] 0]
 166         set botline [lindex [split [$ctext index @0,[winfo height $ctext]] .] 0]
 167         if {$doall || $botline < $smarktop || $topline > $smarkbot} {
 168                 # no overlap with previous
 169                 _mark_range $this $topline $botline
 170                 set smarktop $topline
 171                 set smarkbot $botline
 172         } else {
 173                 if {$topline < $smarktop} {
 174                         _mark_range $this $topline [expr {$smarktop-1}]
 175                         set smarktop $topline
 176                 }
 177                 if {$botline > $smarkbot} {
 178                         _mark_range $this [expr {$smarkbot+1}] $botline
 179                         set smarkbot $botline
 180                 }
 181         }
 182 }
 183
 184 method scrolled {} {
 185         if {$searchstring ne {}} {
 186                 after idle [cb _set_marks 0]
 187         }
 188 }
 189
 190 }