Pmw.MessageBar() - information line for displaying short messages
A message bar contains a single-line message display area. Messages of several different types may displayed. Messages are cleared after a period defined for each message type. Each message type has a priority so that if the application attempts to display more than one message at a time, the message with the highest priority will be displayed. Messages may be accompanied by a number of audible bells.
This megawidget can be used for both interactive help messages (when the mouse enters certain widgets) and also for other general messages.
To perform the help function it can cooperate with the Pmw.Balloon megawidget so that the programmer (or user) can choose either balloon help, message bar help, both or neither.
This megawidget supports a configurable number of message types. The default types include 'state', 'help', 'usererror' and 'systemerror'. The difference between these are the length of time they are displayed, the number of bells that are rung and the priority of the message. For example, the 'help' message type is lower in priority than the 'usererror', so that error messages will always be displayed in preference to help messages regardless of the order the messages are created. The 'state' message type is lowest in priority but has no timeout, so it should contain messages describing the current state of the application, such as Waiting for database connection or 'Waiting for file to be unlocked'. Generally this should be set to the empty string when the application is running normally. By default the help messages (with message type 'help') time out after 5 seconds, so that if the cursor happens to be left over a widget, the application state will be redisplayed after a short time.
If None, a label component is not created. The default is None.
{ '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), }
message('help', text)
.
class Demo: def __init__(self, parent): # Create and pack the MessageBar. self._messagebar = Pmw.MessageBar(parent, entry_width = 40, entry_relief='groove', labelpos = 'w', label_text = 'Status:') self._messagebar.pack(side = 'bottom', fill = 'x', expand = 1, padx = 10, pady = 10) # Create and pack the ScrolledListBox to change the MessageBar. self.box = Pmw.ScrolledListBox(parent, listbox_selectmode='single', items=('state', 'help', 'userevent', 'systemevent', 'usererror', 'systemerror', 'busy',), label_text='Message type', labelpos='n', selectioncommand=self.selectionCommand) self.box.pack(fill = 'both', expand = 'yes', padx = 10, pady = 10) self._index = 0 self._stateCounter = 0 def selectionCommand(self): sels = self.box.getcurselection() if len(sels) > 0: self._index = self._index + 1 messagetype = sels[0] if messagetype == 'state': self._stateCounter = (self._stateCounter + 1) % 3 text = stateMessages[self._stateCounter] if text != '': text = text + ' (' + messagetype + ')' self._messagebar.message('state', text) else: text = messages[messagetype] text = text + ' (' + messagetype + ')' self._messagebar.message(messagetype, text) if messagetype == 'busy': Pmw.showbusycursor() self.box.after(2000) Pmw.hidebusycursor() self._messagebar.resetmessages('busy') text = 'All files successfully removed' text = text + ' (userevent)' self._messagebar.message('userevent', text) messages = { 'help': 'Save current file', 'userevent': 'Saving file "foo"', 'busy': 'Busy deleting all files from file system ...', 'systemevent': 'File "foo" saved', 'usererror': 'Invalid file name "foo/bar"', 'systemerror': 'Failed to save file: file system full', } stateMessages = { 0: '', 1: 'Database is down', 2: 'Waiting for reply from database', }
Pmw 2.1 - 31 Dec 2020 - Home