From 452af488c5e9513b165bcd1b505fbb7fd88d26e2 Mon Sep 17 00:00:00 2001
From: sls <sls>
Date: Thu, 23 Mar 1995 06:55:33 +0000
Subject: [PATCH] Initial revision

---
 help.tcl | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 help.tcl

diff --git a/help.tcl b/help.tcl
new file mode 100644
index 0000000..a7267f2
--- /dev/null
+++ b/help.tcl
@@ -0,0 +1,70 @@
+#
+# $Id$
+#
+
+lappend auto_path /usr/local/lib/stl
+
+dialog help_window {
+    param topics {}
+    param width 50
+    param height 35
+    param helpdir .
+    method create {} {
+	frame $self.menu -relief raised -bd 2
+	menubutton $self.menu.topics -text "Topics" -underline 0 \
+	    -menu $self.menu.topics.m
+	pack $self.menu.topics -in $self.menu -side left
+	set m [menu $self.menu.topics.m]
+	frame $self.text -bd 2 -relief raised
+	scrollbar $self.text.sb -command "$self.text.t yview"
+	text $self.text.t -relief sunken -bd 2 -yscroll "$self.text.sb set" \
+	    -wrap word -setgrid 1
+	set t $self.text.t
+	pack $self.text.sb -in $self.text -side right -fill y
+	pack $self.text.t -in $self.text -side left -fill both -expand yes
+	pack $self.menu -in $self -side top -fill x
+	pack $self.text -in $self -side bottom -fill both -expand yes
+    }
+    method reconfig {} {
+	set m $self.menu.topics.m
+	$m delete 0 last
+	foreach topic $slot(topics) {
+	    $m add radiobutton -variable [object_slotname topic] \
+		-value $topic \
+		-label $topic \
+		-command [list $self show_topic $topic]
+	}
+	$m add separator
+	$m add command -label "Close Help" -underline 0 \
+	    -command "destroy $self"
+	$self.text.t config -width $slot(width) -height $slot(height)
+    }
+    method show_topic {topic} {
+	set slot(topic) $topic
+	$self read_topic $topic
+	wm title $self "Help: $topic"
+    }
+    method read_topic {topic} {
+	set f [open $slot(helpdir)/$topic.html r]
+	set txt [read $f]
+	close $f
+	feedback .help_feedback -steps [set slot(len) [string length $txt]]
+	set slot(remaining) $slot(len)
+	grab set .help_feedback
+	tkhtml_set_render_hook "$self update_feedback"
+	tkhtml_set_command "$self follow_link"
+	tkhtml_render $self.text.t $txt
+	grab release .help_feedback
+	destroy .help_feedback
+    }
+    method follow_link {link} {
+	$self read_topic [file root $link]
+    }
+    method update_feedback {n} {
+	if {($slot(remaining) - $n) > .1*$slot(len)} {
+	    .help_feedback step [expr $slot(remaining) - $n]
+	    update idletasks
+	    set slot(remaining) $n
+	}
+    }
+}
-- 
2.23.0