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# Class to display messages in an information line.
import string
import tkinter
import Pmw
class MessageBar(Pmw.MegaWidget):
def __init__(self, parent = None, **kw):
# Define the megawidget options.
INITOPT = Pmw.INITOPT
defaultMessageTypes = {
# (priority, showtime, bells, logmessage)
'systemerror' : (5, 10, 2, 1),
'usererror' : (4, 5, 1, 0),
'busy' : (3, 0, 0, 0),
'systemevent' : (2, 5, 0, 0),
'userevent' : (2, 5, 0, 0),
'help' : (1, 5, 0, 0),
'state' : (0, 0, 0, 0),
}
optiondefs = (
('labelmargin', 0, INITOPT),
('labelpos', None, INITOPT),
('messagetypes', defaultMessageTypes, INITOPT),
('silent', 0, None),
('sticky', 'ew', INITOPT),
)
self.defineoptions(kw, optiondefs)
# Initialise the base class (after defining the options).
Pmw.MegaWidget.__init__(self, parent)
# Create the components.
interior = self.interior()
self._messageBarEntry = self.createcomponent('entry',
(), None,
tkinter.Entry, (interior,))
# Can't always use 'disabled', since this greys out text in Tk 8.4.2
try:
self._messageBarEntry.configure(state = 'readonly')
except tkinter.TclError:
self._messageBarEntry.configure(state = 'disabled')
self._messageBarEntry.grid(column=2, row=2, sticky=self['sticky'])
interior.grid_columnconfigure(2, weight=1)
interior.grid_rowconfigure(2, weight=1)
self.createlabel(interior)
# Initialise instance variables.
self._numPriorities = 0
for info in list(self['messagetypes'].values()):
if self._numPriorities < info[0]:
self._numPriorities = info[0]
self._numPriorities = self._numPriorities + 1
self._timer = [None] * self._numPriorities
self._messagetext = [''] * self._numPriorities
self._activemessage = [0] * self._numPriorities
# Check keywords and initialise options.
self.initialiseoptions()
def destroy(self):
for timerId in self._timer:
if timerId is not None:
self.after_cancel(timerId)
self._timer = [None] * self._numPriorities
Pmw.MegaWidget.destroy(self)
def message(self, type, text):
# Display a message in the message bar.
(priority, showtime, bells, logmessage) = self['messagetypes'][type]
if not self['silent']:
for i in range(bells):
if i != 0:
self.after(100)
self.bell()
self._activemessage[priority] = 1
if text is None:
text = ''
self._messagetext[priority] = text.replace('\n', ' ')
self._redisplayInfoMessage()
if logmessage:
# Should log this text to a text widget.
pass
if showtime > 0:
if self._timer[priority] is not None:
self.after_cancel(self._timer[priority])
# Define a callback to clear this message after a time.
def _clearmessage(self=self, priority=priority):
self._clearActivemessage(priority)
mseconds = int(showtime * 1000)
self._timer[priority] = self.after(mseconds, _clearmessage)
def helpmessage(self, text):
if text is None:
self.resetmessages('help')
else:
self.message('help', text)
def resetmessages(self, type):
priority = self['messagetypes'][type][0]
self._clearActivemessage(priority)
for messagetype, info in list(self['messagetypes'].items()):
thisPriority = info[0]
showtime = info[1]
if thisPriority < priority and showtime != 0:
self._clearActivemessage(thisPriority)
def _clearActivemessage(self, priority):
self._activemessage[priority] = 0
if self._timer[priority] is not None:
self.after_cancel(self._timer[priority])
self._timer[priority] = None
self._redisplayInfoMessage()
def _redisplayInfoMessage(self):
text = ''
for priority in range(self._numPriorities - 1, -1, -1):
if self._activemessage[priority]:
text = self._messagetext[priority]
break
self._messageBarEntry.configure(state = 'normal')
self._messageBarEntry.delete(0, 'end')
self._messageBarEntry.insert('end', text)
# Can't always use 'disabled', since this greys out text in Tk 8.4.2
try:
self._messageBarEntry.configure(state = 'readonly')
except tkinter.TclError:
self._messageBarEntry.configure(state = 'disabled')
Pmw.forwardmethods(MessageBar, tkinter.Entry, '_messageBarEntry')
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