+ if {![winfo exists .scan-window]} {
+ show-status {Ready} 0 1
+ set cancelFlag 0
+ return
+ }
+ if {$toget < 0} {
+ for {set i 0} {$i < $m} {incr i} {
+ set term [lindex [z39.scan scanLine $i] 1]
+ set nostr [format " %-6d" [lindex [z39.scan scanLine $i] 2]]
+ $w.top.list insert $i "$nostr $term"
+ }
+ } else {
+ $w.top.list delete $start end
+ for {set i 0} {$i < $m} {incr i} {
+ set term [lindex [z39.scan scanLine $i] 1]
+ set nostr [format " %-6d" [lindex [z39.scan scanLine $i] 2]]
+ $w.top.list insert end "$nostr $term"
+ }
+ }
+ if {$cancelFlag} {
+ show-status {Ready} 0 1
+ set cancelFlag 0
+ return
+ }
+ if {$toget > 0 && $m > 1 && $m < $toget} {
+ set ntoget [expr $toget - $m + 1]
+ puts ntoget=$ntoget
+ z39 callback [list scan-response $attr [expr $start + $m - 1] $ntoget]
+ set q $term
+ puts "down continue: $q"
+ if {$ntoget > 10} {
+ z39.scan numberOfTermsRequested 10
+ } else {
+ z39.scan numberOfTermsRequested $ntoget
+ }
+ z39.scan preferredPositionInResponse 1
+ z39.scan scan "${attr} \{$q\}"
+ return
+ }
+ if {$toget < 0 && $m > 1 && $m < [expr - $toget]} {
+ set ntoget [expr - $toget - $m]
+ puts ntoget=$ntoget
+ z39 callback [list scan-response $attr 0 -$ntoget]
+ set q [string range [$w.top.list get 0] 7 end]
+ puts "up continue: $q"
+ if {$ntoget > 10} {
+ z39.scan numberOfTermsRequested 10
+ z39.scan preferredPositionInResponse 11
+ } else {
+ z39.scan numberOfTermsRequested $ntoget
+ z39.scan preferredPositionInResponse [incr ntoget]
+ }
+ z39.scan scan "${attr} \{$q\}"
+ return