365 lines
11 KiB
Python
365 lines
11 KiB
Python
import string
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from tkinter import *
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from idlelib.Delegator import Delegator
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#$ event <<redo>>
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#$ win <Control-y>
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#$ unix <Alt-z>
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#$ event <<undo>>
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#$ win <Control-z>
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#$ unix <Control-z>
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#$ event <<dump-undo-state>>
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#$ win <Control-backslash>
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#$ unix <Control-backslash>
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class UndoDelegator(Delegator):
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max_undo = 1000
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def __init__(self):
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Delegator.__init__(self)
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self.reset_undo()
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def setdelegate(self, delegate):
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if self.delegate is not None:
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self.unbind("<<undo>>")
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self.unbind("<<redo>>")
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self.unbind("<<dump-undo-state>>")
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Delegator.setdelegate(self, delegate)
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if delegate is not None:
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self.bind("<<undo>>", self.undo_event)
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self.bind("<<redo>>", self.redo_event)
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self.bind("<<dump-undo-state>>", self.dump_event)
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def dump_event(self, event):
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from pprint import pprint
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pprint(self.undolist[:self.pointer])
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print("pointer:", self.pointer, end=' ')
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print("saved:", self.saved, end=' ')
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print("can_merge:", self.can_merge, end=' ')
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print("get_saved():", self.get_saved())
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pprint(self.undolist[self.pointer:])
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return "break"
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def reset_undo(self):
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self.was_saved = -1
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self.pointer = 0
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self.undolist = []
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self.undoblock = 0 # or a CommandSequence instance
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self.set_saved(1)
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def set_saved(self, flag):
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if flag:
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self.saved = self.pointer
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else:
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self.saved = -1
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self.can_merge = False
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self.check_saved()
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def get_saved(self):
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return self.saved == self.pointer
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saved_change_hook = None
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def set_saved_change_hook(self, hook):
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self.saved_change_hook = hook
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was_saved = -1
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def check_saved(self):
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is_saved = self.get_saved()
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if is_saved != self.was_saved:
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self.was_saved = is_saved
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if self.saved_change_hook:
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self.saved_change_hook()
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def insert(self, index, chars, tags=None):
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self.addcmd(InsertCommand(index, chars, tags))
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def delete(self, index1, index2=None):
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self.addcmd(DeleteCommand(index1, index2))
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# Clients should call undo_block_start() and undo_block_stop()
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# around a sequence of editing cmds to be treated as a unit by
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# undo & redo. Nested matching calls are OK, and the inner calls
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# then act like nops. OK too if no editing cmds, or only one
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# editing cmd, is issued in between: if no cmds, the whole
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# sequence has no effect; and if only one cmd, that cmd is entered
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# directly into the undo list, as if undo_block_xxx hadn't been
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# called. The intent of all that is to make this scheme easy
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# to use: all the client has to worry about is making sure each
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# _start() call is matched by a _stop() call.
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def undo_block_start(self):
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if self.undoblock == 0:
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self.undoblock = CommandSequence()
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self.undoblock.bump_depth()
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def undo_block_stop(self):
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if self.undoblock.bump_depth(-1) == 0:
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cmd = self.undoblock
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self.undoblock = 0
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if len(cmd) > 0:
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if len(cmd) == 1:
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# no need to wrap a single cmd
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cmd = cmd.getcmd(0)
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# this blk of cmds, or single cmd, has already
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# been done, so don't execute it again
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self.addcmd(cmd, 0)
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def addcmd(self, cmd, execute=True):
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if execute:
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cmd.do(self.delegate)
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if self.undoblock != 0:
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self.undoblock.append(cmd)
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return
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if self.can_merge and self.pointer > 0:
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lastcmd = self.undolist[self.pointer-1]
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if lastcmd.merge(cmd):
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return
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self.undolist[self.pointer:] = [cmd]
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if self.saved > self.pointer:
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self.saved = -1
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self.pointer = self.pointer + 1
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if len(self.undolist) > self.max_undo:
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##print "truncating undo list"
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del self.undolist[0]
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self.pointer = self.pointer - 1
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if self.saved >= 0:
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self.saved = self.saved - 1
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self.can_merge = True
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self.check_saved()
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def undo_event(self, event):
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if self.pointer == 0:
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self.bell()
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return "break"
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cmd = self.undolist[self.pointer - 1]
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cmd.undo(self.delegate)
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self.pointer = self.pointer - 1
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self.can_merge = False
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self.check_saved()
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return "break"
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def redo_event(self, event):
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if self.pointer >= len(self.undolist):
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self.bell()
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return "break"
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cmd = self.undolist[self.pointer]
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cmd.redo(self.delegate)
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self.pointer = self.pointer + 1
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self.can_merge = False
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self.check_saved()
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return "break"
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class Command:
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# Base class for Undoable commands
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tags = None
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def __init__(self, index1, index2, chars, tags=None):
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self.marks_before = {}
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self.marks_after = {}
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self.index1 = index1
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self.index2 = index2
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self.chars = chars
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if tags:
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self.tags = tags
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def __repr__(self):
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s = self.__class__.__name__
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t = (self.index1, self.index2, self.chars, self.tags)
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if self.tags is None:
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t = t[:-1]
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return s + repr(t)
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def do(self, text):
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pass
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def redo(self, text):
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pass
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def undo(self, text):
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pass
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def merge(self, cmd):
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return 0
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def save_marks(self, text):
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marks = {}
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for name in text.mark_names():
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if name != "insert" and name != "current":
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marks[name] = text.index(name)
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return marks
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def set_marks(self, text, marks):
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for name, index in marks.items():
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text.mark_set(name, index)
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class InsertCommand(Command):
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# Undoable insert command
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def __init__(self, index1, chars, tags=None):
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Command.__init__(self, index1, None, chars, tags)
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def do(self, text):
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self.marks_before = self.save_marks(text)
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self.index1 = text.index(self.index1)
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if text.compare(self.index1, ">", "end-1c"):
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# Insert before the final newline
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self.index1 = text.index("end-1c")
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text.insert(self.index1, self.chars, self.tags)
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self.index2 = text.index("%s+%dc" % (self.index1, len(self.chars)))
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self.marks_after = self.save_marks(text)
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##sys.__stderr__.write("do: %s\n" % self)
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def redo(self, text):
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text.mark_set('insert', self.index1)
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text.insert(self.index1, self.chars, self.tags)
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self.set_marks(text, self.marks_after)
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text.see('insert')
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##sys.__stderr__.write("redo: %s\n" % self)
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def undo(self, text):
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text.mark_set('insert', self.index1)
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text.delete(self.index1, self.index2)
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self.set_marks(text, self.marks_before)
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text.see('insert')
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##sys.__stderr__.write("undo: %s\n" % self)
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def merge(self, cmd):
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if self.__class__ is not cmd.__class__:
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return False
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if self.index2 != cmd.index1:
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return False
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if self.tags != cmd.tags:
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return False
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if len(cmd.chars) != 1:
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return False
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if self.chars and \
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self.classify(self.chars[-1]) != self.classify(cmd.chars):
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return False
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self.index2 = cmd.index2
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self.chars = self.chars + cmd.chars
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return True
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alphanumeric = string.ascii_letters + string.digits + "_"
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def classify(self, c):
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if c in self.alphanumeric:
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return "alphanumeric"
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if c == "\n":
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return "newline"
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return "punctuation"
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class DeleteCommand(Command):
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# Undoable delete command
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def __init__(self, index1, index2=None):
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Command.__init__(self, index1, index2, None, None)
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def do(self, text):
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self.marks_before = self.save_marks(text)
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self.index1 = text.index(self.index1)
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if self.index2:
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self.index2 = text.index(self.index2)
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else:
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self.index2 = text.index(self.index1 + " +1c")
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if text.compare(self.index2, ">", "end-1c"):
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# Don't delete the final newline
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self.index2 = text.index("end-1c")
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self.chars = text.get(self.index1, self.index2)
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text.delete(self.index1, self.index2)
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self.marks_after = self.save_marks(text)
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##sys.__stderr__.write("do: %s\n" % self)
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def redo(self, text):
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text.mark_set('insert', self.index1)
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text.delete(self.index1, self.index2)
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self.set_marks(text, self.marks_after)
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text.see('insert')
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##sys.__stderr__.write("redo: %s\n" % self)
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def undo(self, text):
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text.mark_set('insert', self.index1)
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text.insert(self.index1, self.chars)
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self.set_marks(text, self.marks_before)
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text.see('insert')
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##sys.__stderr__.write("undo: %s\n" % self)
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class CommandSequence(Command):
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# Wrapper for a sequence of undoable cmds to be undone/redone
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# as a unit
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def __init__(self):
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self.cmds = []
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self.depth = 0
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def __repr__(self):
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s = self.__class__.__name__
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strs = []
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for cmd in self.cmds:
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strs.append(" %r" % (cmd,))
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return s + "(\n" + ",\n".join(strs) + "\n)"
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def __len__(self):
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return len(self.cmds)
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def append(self, cmd):
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self.cmds.append(cmd)
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def getcmd(self, i):
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return self.cmds[i]
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def redo(self, text):
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for cmd in self.cmds:
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cmd.redo(text)
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def undo(self, text):
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cmds = self.cmds[:]
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cmds.reverse()
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for cmd in cmds:
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cmd.undo(text)
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def bump_depth(self, incr=1):
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self.depth = self.depth + incr
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return self.depth
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def _undo_delegator(parent):
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from idlelib.Percolator import Percolator
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root = Tk()
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root.title("Test UndoDelegator")
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width, height, x, y = list(map(int, re.split('[x+]', parent.geometry())))
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root.geometry("+%d+%d"%(x, y + 150))
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text = Text(root)
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text.config(height=10)
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text.pack()
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text.focus_set()
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p = Percolator(text)
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d = UndoDelegator()
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p.insertfilter(d)
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undo = Button(root, text="Undo", command=lambda:d.undo_event(None))
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undo.pack(side='left')
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redo = Button(root, text="Redo", command=lambda:d.redo_event(None))
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redo.pack(side='left')
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dump = Button(root, text="Dump", command=lambda:d.dump_event(None))
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dump.pack(side='left')
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root.mainloop()
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if __name__ == "__main__":
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from idlelib.idle_test.htest import run
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run(_undo_delegator)
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