PURPOSE --
  Build a widget for selecting a directory.
 
DEVELOPER --
Don Chance
 
MODIFICATION HISTORY --
o Initial implementation 7/24/03
o updated to grab/release focus. dc 10/6/03
o when browse is selected, start at the Browse_dir.  dc 4/25/07

Modules
		Tix os re sys tkMessageBox _tkinter

Classes
		dir_selection_menu   class dir_selection_menu     A GUI for selecting a directory.     Methods defined here: __init__(self, parent, comment, Browse_Opt=0, Browse_dir='', must_exist_flag=1) Create a Tix Label Entry widget with an optional browse button. The entry widget is only editable if there is a browse button. cancel(self) clear(self, event=None) Clear the input file. create(self) get_entry(self) Return the selected file. select_dir_cmd(self) set_entry(self, dir, must_exist=1) Set the directory in the entry box.   If the 'must_exist' flag is true, the gui will produce an error box if the input directory does not exist.

Data
		ACTIVE = 'active' ALL = 'all' ANCHOR = 'anchor' ARC = 'arc' BASELINE = 'baseline' BEVEL = 'bevel' BOTH = 'both' BOTTOM = 'bottom' BROWSE = 'browse' BUTT = 'butt' CASCADE = 'cascade' CENTER = 'center' CHAR = 'char' CHECKBUTTON = 'checkbutton' CHORD = 'chord' COMMAND = 'command' CURRENT = 'current' DISABLED = 'disabled' DOTBOX = 'dotbox' E = 'e' END = 'end' EW = 'ew' EXCEPTION = 8 EXTENDED = 'extended' FALSE = 0 FIRST = 'first' FLAT = 'flat' False = 0 GROOVE = 'groove' HIDDEN = 'hidden' HORIZONTAL = 'horizontal' INSERT = 'insert' INSIDE = 'inside' LAST = 'last' LEFT = 'left' MITER = 'miter' MOVETO = 'moveto' MULTIPLE = 'multiple' N = 'n' NE = 'ne' NO = 0 NONE = 'none' NORMAL = 'normal' NS = 'ns' NSEW = 'nsew' NUMERIC = 'numeric' NW = 'nw' OFF = 0 ON = 1 OUTSIDE = 'outside' PAGES = 'pages' PIESLICE = 'pieslice' PROJECTING = 'projecting' Pmw = <Pmw.Pmw_1_3_3.lib.PmwLoader.PmwLoader instance> RADIOBUTTON = 'radiobutton' RAISED = 'raised' READABLE = 2 RIDGE = 'ridge' RIGHT = 'right' ROUND = 'round' S = 's' SCROLL = 'scroll' SE = 'se' SEL = 'sel' SEL_FIRST = 'sel.first' SEL_LAST = 'sel.last' SEPARATOR = 'separator' SINGLE = 'single' SOLID = 'solid' SUNKEN = 'sunken' SW = 'sw' StringTypes = (<type 'str'>, <type 'unicode'>) TOP = 'top' TRUE = 1 TclVersion = 8.6 TkVersion = 8.6 True = 1 UNDERLINE = 'underline' UNITS = 'units' VERTICAL = 'vertical' W = 'w' WORD = 'word' WRITABLE = 4 X = 'x' Y = 'y' YES = 1 __version__ = '4/25/07' false = 0 true = 1 wantobjects = 1