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503 lines
21 KiB
503 lines
21 KiB
2 years ago
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"""
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An auto-completion window for IDLE, used by the autocomplete extension
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"""
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import platform
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from tkinter import *
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from tkinter.ttk import Scrollbar
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from idlelib.autocomplete import FILES, ATTRS
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from idlelib.multicall import MC_SHIFT
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HIDE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-hide>>"
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HIDE_FOCUS_OUT_SEQUENCE = "<FocusOut>"
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HIDE_SEQUENCES = (HIDE_FOCUS_OUT_SEQUENCE, "<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>", "<Key-Escape>")
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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, tags):
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# The widget (Text) on which we place the AutoCompleteWindow
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self.widget = widget
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# Tags to mark inserted text with
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self.tags = tags
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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.ATTRS or .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 = \
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self.winconfigid = 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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# Flag set to avoid recursive <Configure> callback invocations.
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self.is_configuring = 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.tags)
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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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"""
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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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"""
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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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"""Call when the selection of the Listbox has changed.
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Updates the Listbox display and calls _change_start.
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"""
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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
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one matching completion, don't open a list.
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"""
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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)
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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.update_idletasks() # Need for tk8.6.8 on macOS: #40128.
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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.hideaid = acw.bind(HIDE_VIRTUAL_EVENT_NAME, self.hide_event)
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self.hidewid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME, self.hide_event)
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acw.event_add(HIDE_VIRTUAL_EVENT_NAME, HIDE_FOCUS_OUT_SEQUENCE)
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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.is_configuring = False
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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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return None
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def winconfig_event(self, event):
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if self.is_configuring:
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# Avoid running on recursive <Configure> callback invocations.
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return
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self.is_configuring = True
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if not self.is_active():
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return
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# Since the <Configure> event may occur after the completion window is gone,
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# catch potential TclError exceptions when accessing acw. See: bpo-41611.
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try:
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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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if platform.system().startswith('Windows'):
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# On Windows an update() call is needed for the completion
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# list window to be created, so that we can fetch its width
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# and height. However, this is not needed on other platforms
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# (tested on Ubuntu and macOS) but at one point began
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# causing freezes on macOS. See issues 37849 and 41611.
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acw.update()
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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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acw.update_idletasks()
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except TclError:
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pass
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if platform.system().startswith('Windows'):
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# See issue 15786. When on Windows platform, Tk will misbehave
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# to call winconfig_event multiple times, we need to prevent this,
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# otherwise mouse button double click will not be able to used.
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try:
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acw.unbind(WINCONFIG_SEQUENCE, self.winconfigid)
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except TclError:
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pass
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self.winconfigid = None
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self.is_configuring = False
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def _hide_event_check(self):
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if not self.autocompletewindow:
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return
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try:
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if not self.autocompletewindow.focus_get():
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self.hide_window()
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except KeyError:
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# See issue 734176, when user click on menu, acw.focus_get()
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# will get KeyError.
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self.hide_window()
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def hide_event(self, event):
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# Hide autocomplete list if it exists and does not have focus or
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# mouse click on widget / text area.
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if self.is_active():
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if event.type == EventType.FocusOut:
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# On Windows platform, it will need to delay the check for
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# acw.focus_get() when click on acw, otherwise it will return
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# None and close the window
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self.widget.after(1, self._hide_event_check)
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elif event.type == EventType.ButtonPress:
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# ButtonPress event only bind to self.widget
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self.hide_window()
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def listselect_event(self, event):
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if self.is_active():
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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 None
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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 == 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:
|
||
|
|
self._change_start(self.start + keysym)
|
||
|
|
elif keysym == "underscore":
|
||
|
|
self._change_start(self.start + '_')
|
||
|
|
elif keysym == "period":
|
||
|
|
self._change_start(self.start + '.')
|
||
|
|
elif keysym == "minus":
|
||
|
|
self._change_start(self.start + '-')
|
||
|
|
else:
|
||
|
|
# keysym == "BackSpace"
|
||
|
|
if len(self.start) == 0:
|
||
|
|
self.hide_window()
|
||
|
|
return None
|
||
|
|
self._change_start(self.start[:-1])
|
||
|
|
self.lasttypedstart = self.start
|
||
|
|
self.listbox.select_clear(0, int(self.listbox.curselection()[0]))
|
||
|
|
self.listbox.select_set(self._binary_search(self.start))
|
||
|
|
self._selection_changed()
|
||
|
|
return "break"
|
||
|
|
|
||
|
|
elif keysym == "Return":
|
||
|
|
self.complete()
|
||
|
|
self.hide_window()
|
||
|
|
return 'break'
|
||
|
|
|
||
|
|
elif (self.mode == ATTRS and keysym in
|
||
|
|
("period", "space", "parenleft", "parenright", "bracketleft",
|
||
|
|
"bracketright")) or \
|
||
|
|
(self.mode == FILES and keysym in
|
||
|
|
("slash", "backslash", "quotedbl", "apostrophe")) \
|
||
|
|
and not (state & ~MC_SHIFT):
|
||
|
|
# If start is a prefix of the selection, but is not '' when
|
||
|
|
# completing file names, put the whole
|
||
|
|
# selected completion. Anyway, close the list.
|
||
|
|
cursel = int(self.listbox.curselection()[0])
|
||
|
|
if self.completions[cursel][:len(self.start)] == self.start \
|
||
|
|
and (self.mode == ATTRS or self.start):
|
||
|
|
self._change_start(self.completions[cursel])
|
||
|
|
self.hide_window()
|
||
|
|
return None
|
||
|
|
|
||
|
|
elif keysym in ("Home", "End", "Prior", "Next", "Up", "Down") and \
|
||
|
|
not state:
|
||
|
|
# Move the selection in the listbox
|
||
|
|
self.userwantswindow = True
|
||
|
|
cursel = int(self.listbox.curselection()[0])
|
||
|
|
if keysym == "Home":
|
||
|
|
newsel = 0
|
||
|
|
elif keysym == "End":
|
||
|
|
newsel = len(self.completions)-1
|
||
|
|
elif keysym in ("Prior", "Next"):
|
||
|
|
jump = self.listbox.nearest(self.listbox.winfo_height()) - \
|
||
|
|
self.listbox.nearest(0)
|
||
|
|
if keysym == "Prior":
|
||
|
|
newsel = max(0, cursel-jump)
|
||
|
|
else:
|
||
|
|
assert keysym == "Next"
|
||
|
|
newsel = min(len(self.completions)-1, cursel+jump)
|
||
|
|
elif keysym == "Up":
|
||
|
|
newsel = max(0, cursel-1)
|
||
|
|
else:
|
||
|
|
assert keysym == "Down"
|
||
|
|
newsel = min(len(self.completions)-1, cursel+1)
|
||
|
|
self.listbox.select_clear(cursel)
|
||
|
|
self.listbox.select_set(newsel)
|
||
|
|
self._selection_changed()
|
||
|
|
self._change_start(self.completions[newsel])
|
||
|
|
return "break"
|
||
|
|
|
||
|
|
elif (keysym == "Tab" and not state):
|
||
|
|
if self.lastkey_was_tab:
|
||
|
|
# two tabs in a row; insert current selection and close acw
|
||
|
|
cursel = int(self.listbox.curselection()[0])
|
||
|
|
self._change_start(self.completions[cursel])
|
||
|
|
self.hide_window()
|
||
|
|
return "break"
|
||
|
|
else:
|
||
|
|
# first tab; let AutoComplete handle the completion
|
||
|
|
self.userwantswindow = True
|
||
|
|
self.lastkey_was_tab = True
|
||
|
|
return None
|
||
|
|
|
||
|
|
elif any(s in keysym for s in ("Shift", "Control", "Alt",
|
||
|
|
"Meta", "Command", "Option")):
|
||
|
|
# A modifier key, so ignore
|
||
|
|
return None
|
||
|
|
|
||
|
|
elif event.char and event.char >= ' ':
|
||
|
|
# Regular character with a non-length-1 keycode
|
||
|
|
self._change_start(self.start + event.char)
|
||
|
|
self.lasttypedstart = self.start
|
||
|
|
self.listbox.select_clear(0, int(self.listbox.curselection()[0]))
|
||
|
|
self.listbox.select_set(self._binary_search(self.start))
|
||
|
|
self._selection_changed()
|
||
|
|
return "break"
|
||
|
|
|
||
|
|
else:
|
||
|
|
# Unknown event, close the window and let it through.
|
||
|
|
self.hide_window()
|
||
|
|
return None
|
||
|
|
|
||
|
|
def keyrelease_event(self, event):
|
||
|
|
if not self.is_active():
|
||
|
|
return
|
||
|
|
if self.widget.index("insert") != \
|
||
|
|
self.widget.index("%s+%dc" % (self.startindex, len(self.start))):
|
||
|
|
# If we didn't catch an event which moved the insert, close window
|
||
|
|
self.hide_window()
|
||
|
|
|
||
|
|
def is_active(self):
|
||
|
|
return self.autocompletewindow is not None
|
||
|
|
|
||
|
|
def complete(self):
|
||
|
|
self._change_start(self._complete_string(self.start))
|
||
|
|
# The selection doesn't change.
|
||
|
|
|
||
|
|
def hide_window(self):
|
||
|
|
if not self.is_active():
|
||
|
|
return
|
||
|
|
|
||
|
|
# unbind events
|
||
|
|
self.autocompletewindow.event_delete(HIDE_VIRTUAL_EVENT_NAME,
|
||
|
|
HIDE_FOCUS_OUT_SEQUENCE)
|
||
|
|
for seq in HIDE_SEQUENCES:
|
||
|
|
self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq)
|
||
|
|
|
||
|
|
self.autocompletewindow.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideaid)
|
||
|
|
self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hidewid)
|
||
|
|
self.hideaid = None
|
||
|
|
self.hidewid = None
|
||
|
|
for seq in KEYPRESS_SEQUENCES:
|
||
|
|
self.widget.event_delete(KEYPRESS_VIRTUAL_EVENT_NAME, seq)
|
||
|
|
self.widget.unbind(KEYPRESS_VIRTUAL_EVENT_NAME, self.keypressid)
|
||
|
|
self.keypressid = None
|
||
|
|
self.widget.event_delete(KEYRELEASE_VIRTUAL_EVENT_NAME,
|
||
|
|
KEYRELEASE_SEQUENCE)
|
||
|
|
self.widget.unbind(KEYRELEASE_VIRTUAL_EVENT_NAME, self.keyreleaseid)
|
||
|
|
self.keyreleaseid = None
|
||
|
|
self.listbox.unbind(LISTUPDATE_SEQUENCE, self.listupdateid)
|
||
|
|
self.listupdateid = None
|
||
|
|
if self.winconfigid:
|
||
|
|
self.autocompletewindow.unbind(WINCONFIG_SEQUENCE, self.winconfigid)
|
||
|
|
self.winconfigid = None
|
||
|
|
|
||
|
|
# Re-focusOn frame.text (See issue #15786)
|
||
|
|
self.widget.focus_set()
|
||
|
|
|
||
|
|
# destroy widgets
|
||
|
|
self.scrollbar.destroy()
|
||
|
|
self.scrollbar = None
|
||
|
|
self.listbox.destroy()
|
||
|
|
self.listbox = None
|
||
|
|
self.autocompletewindow.destroy()
|
||
|
|
self.autocompletewindow = None
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
from unittest import main
|
||
|
|
main('idlelib.idle_test.test_autocomplete_w', verbosity=2, exit=False)
|
||
|
|
|
||
|
|
# TODO: autocomplete/w htest here
|