#!/usr/bin/wish

# Simple application showing the use of tree mega widget.

lappend auto_path /usr/local/lib/tk
package require tree

# Now we have to inform the tree widget on parent and tail routines.
# By default, they are normal file dirname and tail routines, because we are displaying a root file system.


# Create utility procs that tree widget uses to query parent and tail components of a node.

proc parent {item} {
   return [file dirname $item]
}
proc tail {item} {
   return [file tail $item]
}

# We create images to display directory and file images.

# Create images that we use to display directory and a normal file.

image create photo idir -data {
    R0lGODdhEAAQAPIAAAAAAHh4eLi4uPj4APj4+P///wAAAAAAACwAAAAAEAAQAAADPVi63P4w
    LkKCtTTnUsXwQqBtAfh910UU4ugGAEucpgnLNY3Gop7folwNOBOeiEYQ0acDpp6pGAFArVqt
    hQQAO///
}
image create photo ifile -data {
    R0lGODdhEAAQAPIAAAAAAHh4eLi4uPj4+P///wAAAAAAAAAAACwAAAAAEAAQAAADPkixzPOD
    yADrWE8qC8WN0+BZAmBq1GMOqwigXFXCrGk/cxjjr27fLtout6n9eMIYMTXsFZsogXRKJf6u
    P0kCADv/
}

# Next, we create a routine that dynamically adds the children of the node
# if the node happens to be the directory when the user double clicks on the item.


# Dynamically add entries to the tree widget.

proc AddDir {wid dir} {
    if ![file isdirectory $dir ] {
	return;
    }
    foreach file [exec ls $dir] {
	set file [file join $dir $file]
	if [file isdirectory $file] {
	    tree::additem $wid [file join $dir $file] -image idir
	} else {
	    tree::additem $wid [file join $dir $file] -image ifile
	}	    
    }
}

# The main process creates the tree and sets up the Double click bindings for the tree widget. 
# It also adds the  toplevel / node to the tree.


# main procedure

# Create tree wiget and set up bindings.

tree::create .t -width 150 -height 400

# open a node when gets double clicked.

.t bind x <Double-1> {
    puts "Called"
    set child [tree::labelat %W %x %y]
    AddDir %W $child
    tree::openbranch %W $child
}


AddDir .t /

# mange the wiget

pack .t -fill both -expand 1
update