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#!/usr/bin/env python
######################################################################
# Provide classes to simplify creating menubars, pulldown menus, etc.
#
# Mitch Chapman
#---------------------------------------------------------------------
# $Log: Menu.py,v $
# Revision 1.1 1996/12/01 22:58:54 mchapman
# Initial revision
#
######################################################################
__version__ = "$Revision: 1.1 $"
import Tkinter; Tk=Tkinter
import KWDict, string
######################################################################
# Convert a string of the form "&Something" to a tuple:
# ("Something", 0)
# indicating that the first letter of "Something" should be
# underlined. If no "&" occurs inside the string, the second tuple
# item will be None.
######################################################################
def findUnderline(title):
ul = None
i = string.find(title, "&")
if i >= 0:
ul = i
title = title[:ul] + title[ul+1:]
return title, ul
######################################################################
# This class represents a menubar, w. default relief, etc.
######################################################################
class Menubar(Tk.Frame):
##################################################################
# Create a new instance.
##################################################################
def __init__(self, master=None, **kw):
opts = {'relief':'raised', 'bd':2}
for k,v in kw.items():
opts[k] = v
apply(Tk.Frame.__init__, (self, master), opts)
Tk.Pack.config(self, side='top', fill='x')
######################################################################
# This class represents a menu item in a Tk menu.
######################################################################
class Item:
##################################################################
# Create a new instance.
# master is the pane to which to append the new item.
# title is the text which will appear inside the menu item. It
# also determines what sort of menu item will be created. See
# below for details.
# cmd is the optional callback for this menu item.
# items specifies any items to be displayed in cascaded menus.
##################################################################
def __init__(self, master, title, cmd=None, *items):
self.master = master
self.title = title
if title[0] == "-":
master.add_separator()
self.index = master.index('last')
return
submenu = None
createFn = master.add_command
prefix = title[0:2]
if prefix == "c_":
createFn = master.add_checkbutton
elif prefix == "r_":
createFn = master.add_radiobutton
elif prefix == "m_":
createFn = master.add_cascade
submenu = Pane(master)
apply(submenu.addItems, items)
else:
title = "x_" + title
title, ul = findUnderline(title[2:])
# XXX no means is provided to associate a Tk variable with a
# radio button or a check button.
apply(createFn, (), KWDict.dict(label=title, command=cmd,
underline=ul, menu=submenu))
self.index = master.index('last')
##################################################################
# Enable or disable an item.
##################################################################
def enable(self, doEnable=1):
if doEnable:
newstate = 'normal'
else:
newstate = 'disabled'
try:
# NOTE: This won't work for tear-off entries, or for separators.
self.master.tk.call(self.master._w, 'entryconfigure', self.index,
'-state', newstate)
except Tk.TclError: pass
######################################################################
# This class represents a pulldown menu.
######################################################################
class Pulldown:
##################################################################
# Create a new Pulldown menu.
# Each additional item should be a list consisting of menu
# item string and optional callback. Menu item strings are
# interpreted as indicated in parseMenuStr().
# Returns the menu button which posts the new menu.
##################################################################
def __init__(self, master, title, *items, **kw):
self.master = master
packside='left'
if kw and 'side' in kw.keys():
packside=kw['side']
# Create the menu button.
title, ul = findUnderline(title)
btnKeywords = KWDict.dict(text=title, underline=ul)
btn = apply(Tk.Menubutton, (master,), btnKeywords)
# Create the menu pane and associate it with the button.
menu = btn.menu = Pane(btn)
btn['menu'] = menu
apply(menu.addItems, items)
btn.pack(side=packside, padx='2m')
######################################################################
# This class extends the Tkinter Menu class with convenience methods
# for enabling/disabling menu items and for support of popup menus.
######################################################################
class Pane(Tk.Menu):
##################################################################
# Init a new instance.
##################################################################
def __init__(self, master=None, **kw):
apply(Tk.Menu.__init__, (self, master), kw)
self.items = []
##################################################################
# Add items to a menu Pane.
##################################################################
def addItems(self, *newItems):
# Create a menu item for each described item.
for item in newItems:
self.items.append(apply(Item, (self,) + tuple(item)))
##################################################################
# Enable or disable a menu item.
# If enable is non-zero, then the menu item is enabled; otherwise
# it is disabled.
##################################################################
def enable(self, index, enable=1):
self.items[index].enable(enable)
##################################################################
# Pop up a menu pane --
# useful when Pane is being used as a popup menu.
##################################################################
def tk_popup(self, event=None):
x, y = 0, 0
if event:
x, y = event.x_root, event.y_root
self.tk.call('tk_popup', self._w, x, y)
######################################################################
# Mainline for testing
######################################################################
def main():
import TkDlgWrapper; TkDlg=TkDlgWrapper
# To demonstrate, here's a simple file editor.
f = Tk.Frame()
m = Menubar(f)
t = Tk.Text(f)
# Here are the file types which the open/save dialogs will recognize.
filetypes = (("Python", ".py"), ("Text", ".txt"), ("All Files", "*"))
openFile = TkDlg.OpenFile(f, defaultextension=".py",
filetypes=filetypes)
saveFile = TkDlg.SaveFile(f, defaultextension=".py",
filetypes=filetypes)
# Here's an example of a popup menu. It should appear when
# you click mouse button 3 inside the text area.
textPopup = Pane(f, tearoff='0')
textPopup.addItems(["Cut"], ["Copy"], ["Paste"], ["Clear"])
# Initially, disable all of the items. Enable them when a file
# is actually opened.
for item in textPopup.items:
item.enable(0)
t.bind("<3>", textPopup.tk_popup)
def openAFile(openDlg = openFile, text=t, popup=textPopup):
filename = openDlg.show()
if filename:
text.delete('1.0', 'end')
inf = open(filename)
text.insert('end', inf.read())
inf.close()
text.winfo_toplevel().title("Menu Example:%s" % filename)
# Enable the popup menu items.
for item in popup.items:
item.enable(1)
def saveAFile(saveDlg = saveFile, text=t):
filename = saveDlg.show()
if filename:
outf = open(filename, "w")
outf.write(text.get('1.0', 'end'))
outf.close()
text.winfo_toplevel().title("Menu Example:%s" % filename)
# Keyboard menu traversal appears to be broken under Tk 4.2 Try using
# keyboard traversal in the tk4.2 library's demo subdirectory...
fileMenu = Pulldown(m, "&File",
["&Open...", openAFile],
["Save &As...", saveAFile],
["----"],
["E&xit", m.quit])
helpMenu = Pulldown(m, "&Help",
["&About"],
side='right')
m.pack()
t.pack()
f.pack()
f.master.title("Menu Example")
f.mainloop()
if __name__ == "__main__":
main()
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