[Code Challenge] WxPython versus Tkinter.

[Kevin Walzer]

I found this code in the Demo/tkinter/ttk directory of the Python 2.7.1 
source distribution. I'm NOT the author (credit should probably go to 
Guilherme Polo, developer of the Tkinter wrapper for the ttk themed 
widgets that is now in the stdlib). But, using a tree/listview widget 
that is part of the Tk/Tkinter core (NOT an extension),  it presents a 
decent, simple file browser:

"""A directory browser using Ttk Treeview.

Based on the demo found in Tk 8.5 library/demos/browse
"""
import os
import glob
import Tkinter
import ttk

def populate_tree(tree, node):
     if tree.set(node, "type") != 'directory':
         return

     path = tree.set(node, "fullpath")
     tree.delete(*tree.get_children(node))

     parent = tree.parent(node)
     special_dirs = [] if parent else glob.glob('.') + glob.glob('..')

     for p in special_dirs + os.listdir(path):
         ptype = None
         p = os.path.join(path, p).replace('\\', '/')
         if os.path.isdir(p): ptype = "directory"
         elif os.path.isfile(p): ptype = "file"

         fname = os.path.split(p)[1]
         id = tree.insert(node, "end", text=fname, values=[p, ptype])

         if ptype == 'directory':
             if fname not in ('.', '..'):
                 tree.insert(id, 0, text="dummy")
                 tree.item(id, text=fname)
         elif ptype == 'file':
             size = os.stat(p).st_size
             tree.set(id, "size", "%d bytes" % size)


def populate_roots(tree):
     dir = os.path.abspath('.').replace('\\', '/')
     node = tree.insert('', 'end', text=dir, values=[dir, "directory"])
     populate_tree(tree, node)

def update_tree(event):
     tree = event.widget
     populate_tree(tree, tree.focus())

def change_dir(event):
     tree = event.widget
     node = tree.focus()
     if tree.parent(node):
         path = os.path.abspath(tree.set(node, "fullpath"))
         if os.path.isdir(path):
             os.chdir(path)
             tree.delete(tree.get_children(''))
             populate_roots(tree)

def autoscroll(sbar, first, last):
     """Hide and show scrollbar as needed."""
     first, last = float(first), float(last)
     if first <= 0 and last >= 1:
         sbar.grid_remove()
     else:
         sbar.grid()
     sbar.set(first, last)

root = Tkinter.Tk()

vsb = ttk.Scrollbar(orient="vertical")
hsb = ttk.Scrollbar(orient="horizontal")

tree = ttk.Treeview(columns=("fullpath", "type", "size"),
     displaycolumns="size", yscrollcommand=lambda f, l: autoscroll(vsb, 
f, l),
     xscrollcommand=lambda f, l:autoscroll(hsb, f, l))

vsb['command'] = tree.yview
hsb['command'] = tree.xview

tree.heading("#0", text="Directory Structure", anchor='w')
tree.heading("size", text="File Size", anchor='w')
tree.column("size", stretch=0, width=100)

populate_roots(tree)
tree.bind('<<TreeviewOpen>>', update_tree)
tree.bind('<Double-Button-1>', change_dir)

# Arrange the tree and its scrollbars in the toplevel
tree.grid(column=0, row=0, sticky='nswe')
vsb.grid(column=1, row=0, sticky='ns')
hsb.grid(column=0, row=1, sticky='ew')
root.grid_columnconfigure(0, weight=1)
root.grid_rowconfigure(0, weight=1)

root.mainloop()




-- 
Kevin Walzer
Code by Kevin
http://www.codebykevin.com