import textConfig # startup font and colors
configs = textConfig.dict # work if not on the path or bad
except: # define in client app directory
configs = {}

helptext = """PyEdit version %s
April, 2010
(2.0: January, 2006)
(1.0: October, 2000)

Programming Python, 4th Edition
Mark Lutz, for O'Reilly Media, Inc.

A text editor program and embeddable object
component, written in Python/tkinter. Use
menu tear-offs and toolbar for quick access
to actions, and Alt-key shortcuts for menus.

Additions in version %s:

• supports Python 3.X


• new "grep" external files search dialog


• verifies app quit if other edit windows changed


• supports arbitrary Unicode encodings for files


• allows multiple change and font dialogs


• various improvements to the Run Code option

Prior version additions:

• font pick dialog


• unlimited undo/redo


• quit/open/new/run prompt save only if changed


• searches are case-insensitive


• startup configuration module textConfig.py
  """

START = '1.0' # index of first char: row=1,col=0
SEL_FIRST = SEL + '.first' # map sel tag to index
SEL_LAST = SEL + '.last' # same as 'sel.last'

FontScale = 0 # use bigger font on Linux
if sys.platform[:3] != 'win': # and other non-Windows boxes
FontScale = 3

################################################################################

Main class: implements editor GUI, actions

requires a flavor of GuiMaker to be mixed in by more specific subclasses;

not a direct subclass of GuiMaker because that class takes multiple forms.

################################################################################

class TextEditor: # mix with menu/toolbar Frame class
startfiledir = '.' # for dialogs
editwindows = [] # for process-wide quit check

Unicode configurations

imported in class to allow overrides in subclass or self

698 | Chapter 11: Complete GUI Programs