| """ |
| MultiCall - a class which inherits its methods from a Tkinter widget (Text, for |
| example), but enables multiple calls of functions per virtual event - all |
| matching events will be called, not only the most specific one. This is done |
| by wrapping the event functions - event_add, event_delete and event_info. |
| MultiCall recognizes only a subset of legal event sequences. Sequences which |
| are not recognized are treated by the original Tk handling mechanism. A |
| more-specific event will be called before a less-specific event. |
| |
| The recognized sequences are complete one-event sequences (no emacs-style |
| Ctrl-X Ctrl-C, no shortcuts like <3>), for all types of events. |
| Key/Button Press/Release events can have modifiers. |
| The recognized modifiers are Shift, Control, Option and Command for Mac, and |
| Control, Alt, Shift, Meta/M for other platforms. |
| |
| For all events which were handled by MultiCall, a new member is added to the |
| event instance passed to the binded functions - mc_type. This is one of the |
| event type constants defined in this module (such as MC_KEYPRESS). |
| For Key/Button events (which are handled by MultiCall and may receive |
| modifiers), another member is added - mc_state. This member gives the state |
| of the recognized modifiers, as a combination of the modifier constants |
| also defined in this module (for example, MC_SHIFT). |
| Using these members is absolutely portable. |
| |
| The order by which events are called is defined by these rules: |
| 1. A more-specific event will be called before a less-specific event. |
| 2. A recently-binded event will be called before a previously-binded event, |
| unless this conflicts with the first rule. |
| Each function will be called at most once for each event. |
| """ |
| |
| import sys |
| import string |
| import re |
| import Tkinter |
| |
| # the event type constants, which define the meaning of mc_type |
| MC_KEYPRESS=0; MC_KEYRELEASE=1; MC_BUTTONPRESS=2; MC_BUTTONRELEASE=3; |
| MC_ACTIVATE=4; MC_CIRCULATE=5; MC_COLORMAP=6; MC_CONFIGURE=7; |
| MC_DEACTIVATE=8; MC_DESTROY=9; MC_ENTER=10; MC_EXPOSE=11; MC_FOCUSIN=12; |
| MC_FOCUSOUT=13; MC_GRAVITY=14; MC_LEAVE=15; MC_MAP=16; MC_MOTION=17; |
| MC_MOUSEWHEEL=18; MC_PROPERTY=19; MC_REPARENT=20; MC_UNMAP=21; MC_VISIBILITY=22; |
| # the modifier state constants, which define the meaning of mc_state |
| MC_SHIFT = 1<<0; MC_CONTROL = 1<<2; MC_ALT = 1<<3; MC_META = 1<<5 |
| MC_OPTION = 1<<6; MC_COMMAND = 1<<7 |
| |
| # define the list of modifiers, to be used in complex event types. |
| if sys.platform == "darwin" and sys.executable.count(".app"): |
| _modifiers = (("Shift",), ("Control",), ("Option",), ("Command",)) |
| _modifier_masks = (MC_SHIFT, MC_CONTROL, MC_OPTION, MC_COMMAND) |
| else: |
| _modifiers = (("Control",), ("Alt",), ("Shift",), ("Meta", "M")) |
| _modifier_masks = (MC_CONTROL, MC_ALT, MC_SHIFT, MC_META) |
| |
| # a dictionary to map a modifier name into its number |
| _modifier_names = dict([(name, number) |
| for number in range(len(_modifiers)) |
| for name in _modifiers[number]]) |
| |
| # A binder is a class which binds functions to one type of event. It has two |
| # methods: bind and unbind, which get a function and a parsed sequence, as |
| # returned by _parse_sequence(). There are two types of binders: |
| # _SimpleBinder handles event types with no modifiers and no detail. |
| # No Python functions are called when no events are binded. |
| # _ComplexBinder handles event types with modifiers and a detail. |
| # A Python function is called each time an event is generated. |
| |
| class _SimpleBinder: |
| def __init__(self, type, widget, widgetinst): |
| self.type = type |
| self.sequence = '<'+_types[type][0]+'>' |
| self.widget = widget |
| self.widgetinst = widgetinst |
| self.bindedfuncs = [] |
| self.handlerid = None |
| |
| def bind(self, triplet, func): |
| if not self.handlerid: |
| def handler(event, l = self.bindedfuncs, mc_type = self.type): |
| event.mc_type = mc_type |
| wascalled = {} |
| for i in range(len(l)-1, -1, -1): |
| func = l[i] |
| if func not in wascalled: |
| wascalled[func] = True |
| r = func(event) |
| if r: |
| return r |
| self.handlerid = self.widget.bind(self.widgetinst, |
| self.sequence, handler) |
| self.bindedfuncs.append(func) |
| |
| def unbind(self, triplet, func): |
| self.bindedfuncs.remove(func) |
| if not self.bindedfuncs: |
| self.widget.unbind(self.widgetinst, self.sequence, self.handlerid) |
| self.handlerid = None |
| |
| def __del__(self): |
| if self.handlerid: |
| self.widget.unbind(self.widgetinst, self.sequence, self.handlerid) |
| |
| # An int in range(1 << len(_modifiers)) represents a combination of modifiers |
| # (if the least significent bit is on, _modifiers[0] is on, and so on). |
| # _state_subsets gives for each combination of modifiers, or *state*, |
| # a list of the states which are a subset of it. This list is ordered by the |
| # number of modifiers is the state - the most specific state comes first. |
| _states = range(1 << len(_modifiers)) |
| _state_names = [reduce(lambda x, y: x + y, |
| [_modifiers[i][0]+'-' for i in range(len(_modifiers)) |
| if (1 << i) & s], |
| "") |
| for s in _states] |
| _state_subsets = map(lambda i: filter(lambda j: not (j & (~i)), _states), |
| _states) |
| for l in _state_subsets: |
| l.sort(lambda a, b, nummod = lambda x: len(filter(lambda i: (1<<i) & x, |
| range(len(_modifiers)))): |
| nummod(b) - nummod(a)) |
| # _state_codes gives for each state, the portable code to be passed as mc_state |
| _state_codes = [reduce(lambda x, y: x | y, |
| [_modifier_masks[i] for i in range(len(_modifiers)) |
| if (1 << i) & s], |
| 0) |
| for s in _states] |
| |
| class _ComplexBinder: |
| # This class binds many functions, and only unbinds them when it is deleted. |
| # self.handlerids is the list of seqs and ids of binded handler functions. |
| # The binded functions sit in a dictionary of lists of lists, which maps |
| # a detail (or None) and a state into a list of functions. |
| # When a new detail is discovered, handlers for all the possible states |
| # are binded. |
| |
| def __create_handler(self, lists, mc_type, mc_state): |
| def handler(event, lists = lists, |
| mc_type = mc_type, mc_state = mc_state, |
| ishandlerrunning = self.ishandlerrunning, |
| doafterhandler = self.doafterhandler): |
| ishandlerrunning[:] = [True] |
| event.mc_type = mc_type |
| event.mc_state = mc_state |
| wascalled = {} |
| r = None |
| for l in lists: |
| for i in range(len(l)-1, -1, -1): |
| func = l[i] |
| if func not in wascalled: |
| wascalled[func] = True |
| r = l[i](event) |
| if r: |
| break |
| if r: |
| break |
| ishandlerrunning[:] = [] |
| # Call all functions in doafterhandler and remove them from list |
| while doafterhandler: |
| doafterhandler.pop()() |
| if r: |
| return r |
| return handler |
| |
| def __init__(self, type, widget, widgetinst): |
| self.type = type |
| self.typename = _types[type][0] |
| self.widget = widget |
| self.widgetinst = widgetinst |
| self.bindedfuncs = {None: [[] for s in _states]} |
| self.handlerids = [] |
| # we don't want to change the lists of functions while a handler is |
| # running - it will mess up the loop and anyway, we usually want the |
| # change to happen from the next event. So we have a list of functions |
| # for the handler to run after it finishes calling the binded functions. |
| # It calls them only once. |
| # ishandlerrunning is a list. An empty one means no, otherwise - yes. |
| # this is done so that it would be mutable. |
| self.ishandlerrunning = [] |
| self.doafterhandler = [] |
| for s in _states: |
| lists = [self.bindedfuncs[None][i] for i in _state_subsets[s]] |
| handler = self.__create_handler(lists, type, _state_codes[s]) |
| seq = '<'+_state_names[s]+self.typename+'>' |
| self.handlerids.append((seq, self.widget.bind(self.widgetinst, |
| seq, handler))) |
| |
| def bind(self, triplet, func): |
| if not self.bindedfuncs.has_key(triplet[2]): |
| self.bindedfuncs[triplet[2]] = [[] for s in _states] |
| for s in _states: |
| lists = [ self.bindedfuncs[detail][i] |
| for detail in (triplet[2], None) |
| for i in _state_subsets[s] ] |
| handler = self.__create_handler(lists, self.type, |
| _state_codes[s]) |
| seq = "<%s%s-%s>"% (_state_names[s], self.typename, triplet[2]) |
| self.handlerids.append((seq, self.widget.bind(self.widgetinst, |
| seq, handler))) |
| doit = lambda: self.bindedfuncs[triplet[2]][triplet[0]].append(func) |
| if not self.ishandlerrunning: |
| doit() |
| else: |
| self.doafterhandler.append(doit) |
| |
| def unbind(self, triplet, func): |
| doit = lambda: self.bindedfuncs[triplet[2]][triplet[0]].remove(func) |
| if not self.ishandlerrunning: |
| doit() |
| else: |
| self.doafterhandler.append(doit) |
| |
| def __del__(self): |
| for seq, id in self.handlerids: |
| self.widget.unbind(self.widgetinst, seq, id) |
| |
| # define the list of event types to be handled by MultiEvent. the order is |
| # compatible with the definition of event type constants. |
| _types = ( |
| ("KeyPress", "Key"), ("KeyRelease",), ("ButtonPress", "Button"), |
| ("ButtonRelease",), ("Activate",), ("Circulate",), ("Colormap",), |
| ("Configure",), ("Deactivate",), ("Destroy",), ("Enter",), ("Expose",), |
| ("FocusIn",), ("FocusOut",), ("Gravity",), ("Leave",), ("Map",), |
| ("Motion",), ("MouseWheel",), ("Property",), ("Reparent",), ("Unmap",), |
| ("Visibility",), |
| ) |
| |
| # which binder should be used for every event type? |
| _binder_classes = (_ComplexBinder,) * 4 + (_SimpleBinder,) * (len(_types)-4) |
| |
| # A dictionary to map a type name into its number |
| _type_names = dict([(name, number) |
| for number in range(len(_types)) |
| for name in _types[number]]) |
| |
| _keysym_re = re.compile(r"^\w+$") |
| _button_re = re.compile(r"^[1-5]$") |
| def _parse_sequence(sequence): |
| """Get a string which should describe an event sequence. If it is |
| successfully parsed as one, return a tuple containing the state (as an int), |
| the event type (as an index of _types), and the detail - None if none, or a |
| string if there is one. If the parsing is unsuccessful, return None. |
| """ |
| if not sequence or sequence[0] != '<' or sequence[-1] != '>': |
| return None |
| words = string.split(sequence[1:-1], '-') |
| |
| modifiers = 0 |
| while words and words[0] in _modifier_names: |
| modifiers |= 1 << _modifier_names[words[0]] |
| del words[0] |
| |
| if words and words[0] in _type_names: |
| type = _type_names[words[0]] |
| del words[0] |
| else: |
| return None |
| |
| if _binder_classes[type] is _SimpleBinder: |
| if modifiers or words: |
| return None |
| else: |
| detail = None |
| else: |
| # _ComplexBinder |
| if type in [_type_names[s] for s in ("KeyPress", "KeyRelease")]: |
| type_re = _keysym_re |
| else: |
| type_re = _button_re |
| |
| if not words: |
| detail = None |
| elif len(words) == 1 and type_re.match(words[0]): |
| detail = words[0] |
| else: |
| return None |
| |
| return modifiers, type, detail |
| |
| def _triplet_to_sequence(triplet): |
| if triplet[2]: |
| return '<'+_state_names[triplet[0]]+_types[triplet[1]][0]+'-'+ \ |
| triplet[2]+'>' |
| else: |
| return '<'+_state_names[triplet[0]]+_types[triplet[1]][0]+'>' |
| |
| _multicall_dict = {} |
| def MultiCallCreator(widget): |
| """Return a MultiCall class which inherits its methods from the |
| given widget class (for example, Tkinter.Text). This is used |
| instead of a templating mechanism. |
| """ |
| if widget in _multicall_dict: |
| return _multicall_dict[widget] |
| |
| class MultiCall (widget): |
| assert issubclass(widget, Tkinter.Misc) |
| |
| def __init__(self, *args, **kwargs): |
| apply(widget.__init__, (self,)+args, kwargs) |
| # a dictionary which maps a virtual event to a tuple with: |
| # 0. the function binded |
| # 1. a list of triplets - the sequences it is binded to |
| self.__eventinfo = {} |
| self.__binders = [_binder_classes[i](i, widget, self) |
| for i in range(len(_types))] |
| |
| def bind(self, sequence=None, func=None, add=None): |
| #print "bind(%s, %s, %s) called." % (sequence, func, add) |
| if type(sequence) is str and len(sequence) > 2 and \ |
| sequence[:2] == "<<" and sequence[-2:] == ">>": |
| if sequence in self.__eventinfo: |
| ei = self.__eventinfo[sequence] |
| if ei[0] is not None: |
| for triplet in ei[1]: |
| self.__binders[triplet[1]].unbind(triplet, ei[0]) |
| ei[0] = func |
| if ei[0] is not None: |
| for triplet in ei[1]: |
| self.__binders[triplet[1]].bind(triplet, func) |
| else: |
| self.__eventinfo[sequence] = [func, []] |
| return widget.bind(self, sequence, func, add) |
| |
| def unbind(self, sequence, funcid=None): |
| if type(sequence) is str and len(sequence) > 2 and \ |
| sequence[:2] == "<<" and sequence[-2:] == ">>" and \ |
| sequence in self.__eventinfo: |
| func, triplets = self.__eventinfo[sequence] |
| if func is not None: |
| for triplet in triplets: |
| self.__binders[triplet[1]].unbind(triplet, func) |
| self.__eventinfo[sequence][0] = None |
| return widget.unbind(self, sequence, funcid) |
| |
| def event_add(self, virtual, *sequences): |
| #print "event_add(%s,%s) was called"%(repr(virtual),repr(sequences)) |
| if virtual not in self.__eventinfo: |
| self.__eventinfo[virtual] = [None, []] |
| |
| func, triplets = self.__eventinfo[virtual] |
| for seq in sequences: |
| triplet = _parse_sequence(seq) |
| if triplet is None: |
| #print >> sys.stderr, "Seq. %s was added by Tkinter."%seq |
| widget.event_add(self, virtual, seq) |
| else: |
| if func is not None: |
| self.__binders[triplet[1]].bind(triplet, func) |
| triplets.append(triplet) |
| |
| def event_delete(self, virtual, *sequences): |
| if virtual not in self.__eventinfo: |
| return |
| func, triplets = self.__eventinfo[virtual] |
| for seq in sequences: |
| triplet = _parse_sequence(seq) |
| if triplet is None: |
| #print >> sys.stderr, "Seq. %s was deleted by Tkinter."%seq |
| widget.event_delete(self, virtual, seq) |
| else: |
| if func is not None: |
| self.__binders[triplet[1]].unbind(triplet, func) |
| triplets.remove(triplet) |
| |
| def event_info(self, virtual=None): |
| if virtual is None or virtual not in self.__eventinfo: |
| return widget.event_info(self, virtual) |
| else: |
| return tuple(map(_triplet_to_sequence, |
| self.__eventinfo[virtual][1])) + \ |
| widget.event_info(self, virtual) |
| |
| def __del__(self): |
| for virtual in self.__eventinfo: |
| func, triplets = self.__eventinfo[virtual] |
| if func: |
| for triplet in triplets: |
| self.__binders[triplet[1]].unbind(triplet, func) |
| |
| |
| _multicall_dict[widget] = MultiCall |
| return MultiCall |
| |
| if __name__ == "__main__": |
| # Test |
| root = Tkinter.Tk() |
| text = MultiCallCreator(Tkinter.Text)(root) |
| text.pack() |
| def bindseq(seq, n=[0]): |
| def handler(event): |
| print seq |
| text.bind("<<handler%d>>"%n[0], handler) |
| text.event_add("<<handler%d>>"%n[0], seq) |
| n[0] += 1 |
| bindseq("<Key>") |
| bindseq("<Control-Key>") |
| bindseq("<Alt-Key-a>") |
| bindseq("<Control-Key-a>") |
| bindseq("<Alt-Control-Key-a>") |
| bindseq("<Key-b>") |
| bindseq("<Control-Button-1>") |
| bindseq("<Alt-Button-1>") |
| bindseq("<FocusOut>") |
| bindseq("<Enter>") |
| bindseq("<Leave>") |
| root.mainloop() |