mirror of
https://github.com/python/cpython.git
synced 2025-11-04 07:31:38 +00:00
451 lines
18 KiB
Python
451 lines
18 KiB
Python
"""
|
|
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 re
|
|
import sys
|
|
|
|
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":
|
|
_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 = {name: number
|
|
for number in range(len(_modifiers))
|
|
for name in _modifiers[number]}
|
|
|
|
# In 3.4, if no shell window is ever open, the underlying Tk widget is
|
|
# destroyed before .__del__ methods here are called. The following
|
|
# is used to selectively ignore shutdown exceptions to avoid
|
|
# 'Exception ignored' messages. See http://bugs.python.org/issue20167
|
|
APPLICATION_GONE = "application has been destroyed"
|
|
|
|
# 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:
|
|
try:
|
|
self.widget.unbind(self.widgetinst, self.sequence,
|
|
self.handlerid)
|
|
except tkinter.TclError as e:
|
|
if not APPLICATION_GONE in e.args[0]:
|
|
raise
|
|
|
|
# An int in range(1 << len(_modifiers)) represents a combination of modifiers
|
|
# (if the least significant 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 = [''.join(m[0]+'-'
|
|
for i, m in enumerate(_modifiers)
|
|
if (1 << i) & s)
|
|
for s in _states]
|
|
|
|
def expand_substates(states):
|
|
'''For each item of states return a list containing all combinations of
|
|
that item with individual bits reset, sorted by the number of set bits.
|
|
'''
|
|
def nbits(n):
|
|
"number of bits set in n base 2"
|
|
nb = 0
|
|
while n:
|
|
n, rem = divmod(n, 2)
|
|
nb += rem
|
|
return nb
|
|
statelist = []
|
|
for state in states:
|
|
substates = list({state & x for x in states})
|
|
substates.sort(key=nbits, reverse=True)
|
|
statelist.append(substates)
|
|
return statelist
|
|
|
|
_state_subsets = expand_substates(_states)
|
|
|
|
# _state_codes gives for each state, the portable code to be passed as mc_state
|
|
_state_codes = []
|
|
for s in _states:
|
|
r = 0
|
|
for i in range(len(_modifiers)):
|
|
if (1 << i) & s:
|
|
r |= _modifier_masks[i]
|
|
_state_codes.append(r)
|
|
|
|
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
|
|
for f in doafterhandler:
|
|
f()
|
|
doafterhandler[:] = []
|
|
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 triplet[2] not in self.bindedfuncs:
|
|
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:
|
|
try:
|
|
self.widget.unbind(self.widgetinst, seq, id)
|
|
except tkinter.TclError as e:
|
|
if not APPLICATION_GONE in e.args[0]:
|
|
raise
|
|
|
|
# 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 = {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 = sequence[1:-1].split('-')
|
|
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):
|
|
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)" % (sequence, func, add),
|
|
# file=sys.__stderr__)
|
|
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)" % (repr(virtual), repr(sequences)),
|
|
# file=sys.__stderr__)
|
|
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("Tkinter event_add(%s)" % seq, file=sys.__stderr__)
|
|
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("Tkinter event_delete: %s" % seq, file=sys.__stderr__)
|
|
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:
|
|
try:
|
|
self.__binders[triplet[1]].unbind(triplet, func)
|
|
except tkinter.TclError as e:
|
|
if not APPLICATION_GONE in e.args[0]:
|
|
raise
|
|
|
|
_multicall_dict[widget] = MultiCall
|
|
return MultiCall
|
|
|
|
|
|
def _multi_call(parent): # htest #
|
|
top = tkinter.Toplevel(parent)
|
|
top.title("Test MultiCall")
|
|
x, y = map(int, parent.geometry().split('+')[1:])
|
|
top.geometry("+%d+%d" % (x, y + 175))
|
|
text = MultiCallCreator(tkinter.Text)(top)
|
|
text.pack()
|
|
text.focus_set()
|
|
|
|
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("<Button-2>")
|
|
bindseq("<Alt-Button-1>")
|
|
bindseq("<FocusOut>")
|
|
bindseq("<Enter>")
|
|
bindseq("<Leave>")
|
|
|
|
|
|
if __name__ == "__main__":
|
|
from unittest import main
|
|
main('idlelib.idle_test.test_mainmenu', verbosity=2, exit=False)
|
|
|
|
from idlelib.idle_test.htest import run
|
|
run(_multi_call)
|