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