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markom |
# ventry.tcl - Entry with validation
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# Copyright (C) 1997 Cygnus Solutions.
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# Written by Tom Tromey <tromey@cygnus.com>.
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itcl_class Validated_entry {
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# The validation command. It is passed the contents of the entry.
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# It should throw an error if there is a problem; the error text
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# will be displayed to the user.
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public command {}
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constructor {config} {
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upvar \#0 $this state
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# The standard widget-making trick.
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set class [$this info class]
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set hull [namespace tail $this]
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set old_name $this
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::rename $this $this-tmp-
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::frame $hull -class $class -borderwidth 0
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::rename $hull $old_name-win-
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::rename $this $old_name
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::set ${this}(value) ""
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::entry [namespace tail $this].entry -textvariable ${this}(value)
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pack [namespace tail $this].entry -expand 1 -fill both
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bind [namespace tail $this].entry <Map> [list $this _map]
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bind [namespace tail $this].entry <Unmap> [list $this _unmap]
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bind [namespace tail $this].entry <Destroy> [list $this delete]
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# We never want the focus on the frame.
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bind [namespace tail $this] <FocusIn> [list focus [namespace tail $this].entry]
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# This window is used when the user enters a bad name for the new
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# executable. The color here is "plum3". We use a toplevel here
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# both to get a nice black border and because a frame would be
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# clipped by its parents.
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toplevel [namespace tail $this].badname -borderwidth 1 -background black -relief flat
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wm withdraw [namespace tail $this].badname
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wm overrideredirect [namespace tail $this].badname 1
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::set state(message) ""
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# FIXME: -textvariable didn't work; I suspect itcl.
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::label [namespace tail $this].badname.text -anchor w -justify left \
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-background \#cdd29687cdd2 ;# -textvariable ${this}(message)
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pack [namespace tail $this].badname.text -expand 1 -fill both
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# Trace the entry contents.
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uplevel \#0 [list trace variable ${this}(value) w [list $this _trace]]
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}
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destructor {
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upvar \#0 $this state
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catch {destroy $this}
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uplevel \#0 [list trace vdelete ${this}(value) w [list $this _trace]]
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unset state
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}
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method configure {config} {}
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# Return 1 if we're in the error state, 0 otherwise.
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method is_error {} {
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upvar \#0 $this state
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return [expr {$state(message) != ""}]
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}
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# Return error text.
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method error_text {} {
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upvar \#0 $this state
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return $state(message)
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}
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# Some methods to forward messages to the entry. Add more as
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# required.
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# FIXME: itcl 1.5 won't let us have a `delete' method. Sigh.
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method delete_hack {args} {
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return [eval [namespace tail $this].entry delete $args]
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}
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method get {} {
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return [[namespace tail $this].entry get]
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}
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method insert {index string} {
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return [[namespace tail $this].entry insert $index $string]
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}
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# This is run to display the label. Private method.
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method _display {} {
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# FIXME: place above if it would go offscreen.
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set y [expr {[winfo rooty [namespace tail $this].entry] + [winfo height [namespace tail $this].entry] + 1}]
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set x [expr {round ([winfo rootx [namespace tail $this].entry]
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+ 0.12 * [winfo width [namespace tail $this].entry])}]
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wm positionfrom [namespace tail $this].badname user
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wm geometry [namespace tail $this].badname +$x+$y
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# Workaround for Tk 8.0b2 bug on NT.
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update
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wm deiconify [namespace tail $this].badname
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raise [namespace tail $this].badname
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}
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# This is run when the entry widget is mapped. If we have an error,
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# map our error label. Private method.
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method _map {} {
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if {[is_error]} then {
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_display
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}
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}
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# This is run when the entry widget is unmapped. Private method.
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method _unmap {} {
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wm withdraw [namespace tail $this].badname
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}
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# This is called when the entry contents change. Private method.
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method _trace {args} {
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upvar \#0 $this state
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if {$command != ""} then {
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set cmd $command
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lappend cmd $state(value)
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set cmd [list uplevel \#0 $cmd]
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}
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if {[info exists cmd] && [catch $cmd msg]} then {
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# FIXME: for some reason, the -textvariable on the label doesn't
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# work. I suspect itcl.
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set state(message) $msg
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[namespace tail $this].badname.text configure -text $msg
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_display
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} else {
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set state(message) ""
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wm withdraw [namespace tail $this].badname
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}
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}
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}
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