"""

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An auto-completion window for IDLE, used by the AutoComplete extension

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"""

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from Tkinter import *

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from idlelib.MultiCall import MC_SHIFT

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from idlelib.AutoComplete import COMPLETE_FILES, COMPLETE_ATTRIBUTES

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HIDE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-hide>>"

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HIDE_SEQUENCES = ("<FocusOut>", "<ButtonPress>")

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KEYPRESS_VIRTUAL_EVENT_NAME = "<<autocompletewindow-keypress>>"

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# We need to bind event beyond <Key> so that the function will be called

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# before the default specific IDLE function

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KEYPRESS_SEQUENCES = ("<Key>", "<Key-BackSpace>", "<Key-Return>", "<Key-Tab>",

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"<Key-Up>", "<Key-Down>", "<Key-Home>", "<Key-End>",

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"<Key-Prior>", "<Key-Next>")

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KEYRELEASE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-keyrelease>>"

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KEYRELEASE_SEQUENCE = "<KeyRelease>"

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LISTUPDATE_SEQUENCE = "<B1-ButtonRelease>"

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WINCONFIG_SEQUENCE = "<Configure>"

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DOUBLECLICK_SEQUENCE = "<B1-Double-ButtonRelease>"

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class AutoCompleteWindow:

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def __init__(self, widget):

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# The widget (Text) on which we place the AutoCompleteWindow

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self.widget = widget

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# The widgets we create

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self.autocompletewindow = self.listbox = self.scrollbar = None

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# The default foreground and background of a selection. Saved because

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# they are changed to the regular colors of list items when the

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# completion start is not a prefix of the selected completion

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self.origselforeground = self.origselbackground = None

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# The list of completions

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self.completions = None

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# A list with more completions, or None

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self.morecompletions = None

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# The completion mode. Either AutoComplete.COMPLETE_ATTRIBUTES or

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# AutoComplete.COMPLETE_FILES

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self.mode = None

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# The current completion start, on the text box (a string)

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self.start = None

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# The index of the start of the completion

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self.startindex = None

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# The last typed start, used so that when the selection changes,

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# the new start will be as close as possible to the last typed one.

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self.lasttypedstart = None

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# Do we have an indication that the user wants the completion window

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# (for example, he clicked the list)

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self.userwantswindow = None

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# event ids

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self.hideid = self.keypressid = self.listupdateid = self.winconfigid \

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= self.keyreleaseid = self.doubleclickid = None

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# Flag set if last keypress was a tab

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self.lastkey_was_tab = False

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def _change_start(self, newstart):

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min_len = min(len(self.start), len(newstart))

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i = 0

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while i < min_len and self.start[i] == newstart[i]:

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i += 1

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if i < len(self.start):

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self.widget.delete("%s+%dc" % (self.startindex, i),

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"%s+%dc" % (self.startindex, len(self.start)))

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if i < len(newstart):

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self.widget.insert("%s+%dc" % (self.startindex, i),

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newstart[i:])

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self.start = newstart

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def _binary_search(self, s):

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"""Find the first index in self.completions where completions[i] is

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greater or equal to s, or the last index if there is no such

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one."""

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i = 0; j = len(self.completions)

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while j > i:

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m = (i + j) // 2

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if self.completions[m] >= s:

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j = m

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else:

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i = m + 1

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return min(i, len(self.completions)-1)

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def _complete_string(self, s):

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"""Assuming that s is the prefix of a string in self.completions,

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return the longest string which is a prefix of all the strings which

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s is a prefix of them. If s is not a prefix of a string, return s."""

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first = self._binary_search(s)

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if self.completions[first][:len(s)] != s:

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# There is not even one completion which s is a prefix of.

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return s

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# Find the end of the range of completions where s is a prefix of.

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i = first + 1

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j = len(self.completions)

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while j > i:

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m = (i + j) // 2

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if self.completions[m][:len(s)] != s:

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j = m

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else:

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i = m + 1

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last = i-1

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if first == last: # only one possible completion

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return self.completions[first]

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# We should return the maximum prefix of first and last

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first_comp = self.completions[first]

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last_comp = self.completions[last]

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min_len = min(len(first_comp), len(last_comp))

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i = len(s)

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while i < min_len and first_comp[i] == last_comp[i]:

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i += 1

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return first_comp[:i]

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def _selection_changed(self):

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"""Should be called when the selection of the Listbox has changed.

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Updates the Listbox display and calls _change_start."""

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cursel = int(self.listbox.curselection()[0])

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self.listbox.see(cursel)

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lts = self.lasttypedstart

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selstart = self.completions[cursel]

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if self._binary_search(lts) == cursel:

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newstart = lts

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else:

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min_len = min(len(lts), len(selstart))

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i = 0

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while i < min_len and lts[i] == selstart[i]:

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i += 1

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newstart = selstart[:i]

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self._change_start(newstart)

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if self.completions[cursel][:len(self.start)] == self.start:

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# start is a prefix of the selected completion

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self.listbox.configure(selectbackground=self.origselbackground,

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selectforeground=self.origselforeground)

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else:

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self.listbox.configure(selectbackground=self.listbox.cget("bg"),

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selectforeground=self.listbox.cget("fg"))

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# If there are more completions, show them, and call me again.

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if self.morecompletions:

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self.completions = self.morecompletions

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self.morecompletions = None

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self.listbox.delete(0, END)

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for item in self.completions:

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self.listbox.insert(END, item)

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self.listbox.select_set(self._binary_search(self.start))

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self._selection_changed()

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def show_window(self, comp_lists, index, complete, mode, userWantsWin):

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"""Show the autocomplete list, bind events.

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If complete is True, complete the text, and if there is exactly one

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matching completion, don't open a list."""

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# Handle the start we already have

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self.completions, self.morecompletions = comp_lists

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self.mode = mode

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self.startindex = self.widget.index(index)

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self.start = self.widget.get(self.startindex, "insert")

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if complete:

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completed = self._complete_string(self.start)

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start = self.start

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self._change_start(completed)

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i = self._binary_search(completed)

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if self.completions[i] == completed and \

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(i == len(self.completions)-1 or

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self.completions[i+1][:len(completed)] != completed):

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# There is exactly one matching completion

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return completed == start

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self.userwantswindow = userWantsWin

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self.lasttypedstart = self.start

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# Put widgets in place

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self.autocompletewindow = acw = Toplevel(self.widget)

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# Put it in a position so that it is not seen.

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acw.wm_geometry("+10000+10000")

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# Make it float

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acw.wm_overrideredirect(1)

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try:

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# This command is only needed and available on Tk >= 8.4.0 for OSX

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# Without it, call tips intrude on the typing process by grabbing

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# the focus.

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acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w,

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"help", "noActivates")

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except TclError:

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pass

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self.scrollbar = scrollbar = Scrollbar(acw, orient=VERTICAL)

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self.listbox = listbox = Listbox(acw, yscrollcommand=scrollbar.set,

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exportselection=False, bg="white")

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for item in self.completions:

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listbox.insert(END, item)

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self.origselforeground = listbox.cget("selectforeground")

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self.origselbackground = listbox.cget("selectbackground")

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scrollbar.config(command=listbox.yview)

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scrollbar.pack(side=RIGHT, fill=Y)

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listbox.pack(side=LEFT, fill=BOTH, expand=True)

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acw.lift() # work around bug in Tk 8.5.18+ (issue #24570)

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# Initialize the listbox selection

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self.listbox.select_set(self._binary_search(self.start))

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self._selection_changed()

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# bind events

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self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME,

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self.hide_event)

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for seq in HIDE_SEQUENCES:

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self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq)

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self.keypressid = self.widget.bind(KEYPRESS_VIRTUAL_EVENT_NAME,

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self.keypress_event)

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for seq in KEYPRESS_SEQUENCES:

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self.widget.event_add(KEYPRESS_VIRTUAL_EVENT_NAME, seq)

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self.keyreleaseid = self.widget.bind(KEYRELEASE_VIRTUAL_EVENT_NAME,

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self.keyrelease_event)

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self.widget.event_add(KEYRELEASE_VIRTUAL_EVENT_NAME,KEYRELEASE_SEQUENCE)

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self.listupdateid = listbox.bind(LISTUPDATE_SEQUENCE,

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self.listselect_event)

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self.winconfigid = acw.bind(WINCONFIG_SEQUENCE, self.winconfig_event)

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self.doubleclickid = listbox.bind(DOUBLECLICK_SEQUENCE,

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self.doubleclick_event)

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def winconfig_event(self, event):

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if not self.is_active():

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return

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# Position the completion list window

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text = self.widget

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text.see(self.startindex)

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x, y, cx, cy = text.bbox(self.startindex)

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acw = self.autocompletewindow

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acw_width, acw_height = acw.winfo_width(), acw.winfo_height()

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text_width, text_height = text.winfo_width(), text.winfo_height()

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new_x = text.winfo_rootx() + min(x, max(0, text_width - acw_width))

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new_y = text.winfo_rooty() + y

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if (text_height - (y + cy) >= acw_height # enough height below

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or y < acw_height): # not enough height above

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# place acw below current line

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new_y += cy

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else:

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# place acw above current line

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new_y -= acw_height

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acw.wm_geometry("+%d+%d" % (new_x, new_y))

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def hide_event(self, event):

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if not self.is_active():

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return

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self.hide_window()

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def listselect_event(self, event):

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if not self.is_active():

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return

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self.userwantswindow = True

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cursel = int(self.listbox.curselection()[0])

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self._change_start(self.completions[cursel])

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def doubleclick_event(self, event):

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# Put the selected completion in the text, and close the list

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cursel = int(self.listbox.curselection()[0])

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self._change_start(self.completions[cursel])

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self.hide_window()

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def keypress_event(self, event):

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if not self.is_active():

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return

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keysym = event.keysym

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if hasattr(event, "mc_state"):

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state = event.mc_state

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else:

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state = 0

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if keysym != "Tab":

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self.lastkey_was_tab = False

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if (len(keysym) == 1 or keysym in ("underscore", "BackSpace")

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or (self.mode == COMPLETE_FILES and keysym in

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("period", "minus"))) \

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and not (state & ~MC_SHIFT):

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# Normal editing of text

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if len(keysym) == 1:

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self._change_start(self.start + keysym)

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elif keysym == "underscore":

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self._change_start(self.start + '_')

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elif keysym == "period":

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self._change_start(self.start + '.')

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elif keysym == "minus":

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self._change_start(self.start + '-')

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else:

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# keysym == "BackSpace"

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if len(self.start) == 0:

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self.hide_window()

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return

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self._change_start(self.start[:-1])

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self.lasttypedstart = self.start

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self.listbox.select_clear(0, int(self.listbox.curselection()[0]))

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self.listbox.select_set(self._binary_search(self.start))

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self._selection_changed()

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return "break"

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elif keysym == "Return":

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self.hide_window()

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return

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elif (self.mode == COMPLETE_ATTRIBUTES and keysym in

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("period", "space", "parenleft", "parenright", "bracketleft",

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"bracketright")) or \

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(self.mode == COMPLETE_FILES and keysym in

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("slash", "backslash", "quotedbl", "apostrophe")) \

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and not (state & ~MC_SHIFT):

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# If start is a prefix of the selection, but is not '' when

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# completing file names, put the whole

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# selected completion. Anyway, close the list.

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cursel = int(self.listbox.curselection()[0])

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if self.completions[cursel][:len(self.start)] == self.start \

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and (self.mode == COMPLETE_ATTRIBUTES or self.start):

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self._change_start(self.completions[cursel])

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self.hide_window()

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return

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elif keysym in ("Home", "End", "Prior", "Next", "Up", "Down") and \

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not state:

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# Move the selection in the listbox

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self.userwantswindow = True

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cursel = int(self.listbox.curselection()[0])

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if keysym == "Home":

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newsel = 0

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elif keysym == "End":

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newsel = len(self.completions)-1

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elif keysym in ("Prior", "Next"):

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jump = self.listbox.nearest(self.listbox.winfo_height()) - \

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self.listbox.nearest(0)

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if keysym == "Prior":

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newsel = max(0, cursel-jump)

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else:

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assert keysym == "Next"

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newsel = min(len(self.completions)-1, cursel+jump)

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elif keysym == "Up":

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newsel = max(0, cursel-1)

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else:

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assert keysym == "Down"

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newsel = min(len(self.completions)-1, cursel+1)

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self.listbox.select_clear(cursel)

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self.listbox.select_set(newsel)

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self._selection_changed()

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self._change_start(self.completions[newsel])

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return "break"

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elif (keysym == "Tab" and not state):

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if self.lastkey_was_tab:

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# two tabs in a row; insert current selection and close acw

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cursel = int(self.listbox.curselection()[0])

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self._change_start(self.completions[cursel])

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self.hide_window()

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return "break"

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else:

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# first tab; let AutoComplete handle the completion

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self.userwantswindow = True

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self.lastkey_was_tab = True

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return

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elif any(s in keysym for s in ("Shift", "Control", "Alt",

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"Meta", "Command", "Option")):

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# A modifier key, so ignore

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return

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else:

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# Unknown event, close the window and let it through.

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self.hide_window()

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return

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def keyrelease_event(self, event):

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if not self.is_active():

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return

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if self.widget.index("insert") != \

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self.widget.index("%s+%dc" % (self.startindex, len(self.start))):

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# If we didn't catch an event which moved the insert, close window

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self.hide_window()

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def is_active(self):

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return self.autocompletewindow is not None

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def complete(self):

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self._change_start(self._complete_string(self.start))

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# The selection doesn't change.

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def hide_window(self):

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if not self.is_active():

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return

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# unbind events

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for seq in HIDE_SEQUENCES:

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self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq)

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self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid)

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self.hideid = None

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for seq in KEYPRESS_SEQUENCES:

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self.widget.event_delete(KEYPRESS_VIRTUAL_EVENT_NAME, seq)

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self.widget.unbind(KEYPRESS_VIRTUAL_EVENT_NAME, self.keypressid)

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self.keypressid = None

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self.widget.event_delete(KEYRELEASE_VIRTUAL_EVENT_NAME,

[391] Fix | Delete

KEYRELEASE_SEQUENCE)

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self.widget.unbind(KEYRELEASE_VIRTUAL_EVENT_NAME, self.keyreleaseid)

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self.keyreleaseid = None

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self.listbox.unbind(LISTUPDATE_SEQUENCE, self.listupdateid)

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self.listupdateid = None

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self.autocompletewindow.unbind(WINCONFIG_SEQUENCE, self.winconfigid)

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self.winconfigid = None

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# destroy widgets

[400] Fix | Delete

self.scrollbar.destroy()

[401] Fix | Delete

self.scrollbar = None

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self.listbox.destroy()

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self.listbox = None

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self.autocompletewindow.destroy()

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self.autocompletewindow = None

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