| """ |
| An auto-completion window for IDLE, used by the AutoComplete extension |
| """ |
| from tkinter import * |
| from idlelib.MultiCall import MC_SHIFT |
| from idlelib.AutoComplete import COMPLETE_FILES, COMPLETE_ATTRIBUTES |
| |
| HIDE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-hide>>" |
| HIDE_SEQUENCES = ("<FocusOut>", "<ButtonPress>") |
| KEYPRESS_VIRTUAL_EVENT_NAME = "<<autocompletewindow-keypress>>" |
| # We need to bind event beyond <Key> so that the function will be called |
| # before the default specific IDLE function |
| KEYPRESS_SEQUENCES = ("<Key>", "<Key-BackSpace>", "<Key-Return>", "<Key-Tab>", |
| "<Key-Up>", "<Key-Down>", "<Key-Home>", "<Key-End>", |
| "<Key-Prior>", "<Key-Next>") |
| KEYRELEASE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-keyrelease>>" |
| KEYRELEASE_SEQUENCE = "<KeyRelease>" |
| LISTUPDATE_SEQUENCE = "<B1-ButtonRelease>" |
| WINCONFIG_SEQUENCE = "<Configure>" |
| DOUBLECLICK_SEQUENCE = "<B1-Double-ButtonRelease>" |
| |
| class AutoCompleteWindow: |
| |
| def __init__(self, widget): |
| # The widget (Text) on which we place the AutoCompleteWindow |
| self.widget = widget |
| # The widgets we create |
| self.autocompletewindow = self.listbox = self.scrollbar = None |
| # The default foreground and background of a selection. Saved because |
| # they are changed to the regular colors of list items when the |
| # completion start is not a prefix of the selected completion |
| self.origselforeground = self.origselbackground = None |
| # The list of completions |
| self.completions = None |
| # A list with more completions, or None |
| self.morecompletions = None |
| # The completion mode. Either AutoComplete.COMPLETE_ATTRIBUTES or |
| # AutoComplete.COMPLETE_FILES |
| self.mode = None |
| # The current completion start, on the text box (a string) |
| self.start = None |
| # The index of the start of the completion |
| self.startindex = None |
| # The last typed start, used so that when the selection changes, |
| # the new start will be as close as possible to the last typed one. |
| self.lasttypedstart = None |
| # Do we have an indication that the user wants the completion window |
| # (for example, he clicked the list) |
| self.userwantswindow = None |
| # event ids |
| self.hideid = self.keypressid = self.listupdateid = self.winconfigid \ |
| = self.keyreleaseid = self.doubleclickid = None |
| # Flag set if last keypress was a tab |
| self.lastkey_was_tab = False |
| |
| def _change_start(self, newstart): |
| min_len = min(len(self.start), len(newstart)) |
| i = 0 |
| while i < min_len and self.start[i] == newstart[i]: |
| i += 1 |
| if i < len(self.start): |
| self.widget.delete("%s+%dc" % (self.startindex, i), |
| "%s+%dc" % (self.startindex, len(self.start))) |
| if i < len(newstart): |
| self.widget.insert("%s+%dc" % (self.startindex, i), |
| newstart[i:]) |
| self.start = newstart |
| |
| def _binary_search(self, s): |
| """Find the first index in self.completions where completions[i] is |
| greater or equal to s, or the last index if there is no such |
| one.""" |
| i = 0; j = len(self.completions) |
| while j > i: |
| m = (i + j) // 2 |
| if self.completions[m] >= s: |
| j = m |
| else: |
| i = m + 1 |
| return min(i, len(self.completions)-1) |
| |
| def _complete_string(self, s): |
| """Assuming that s is the prefix of a string in self.completions, |
| return the longest string which is a prefix of all the strings which |
| s is a prefix of them. If s is not a prefix of a string, return s.""" |
| first = self._binary_search(s) |
| if self.completions[first][:len(s)] != s: |
| # There is not even one completion which s is a prefix of. |
| return s |
| # Find the end of the range of completions where s is a prefix of. |
| i = first + 1 |
| j = len(self.completions) |
| while j > i: |
| m = (i + j) // 2 |
| if self.completions[m][:len(s)] != s: |
| j = m |
| else: |
| i = m + 1 |
| last = i-1 |
| |
| if first == last: # only one possible completion |
| return self.completions[first] |
| |
| # We should return the maximum prefix of first and last |
| first_comp = self.completions[first] |
| last_comp = self.completions[last] |
| min_len = min(len(first_comp), len(last_comp)) |
| i = len(s) |
| while i < min_len and first_comp[i] == last_comp[i]: |
| i += 1 |
| return first_comp[:i] |
| |
| def _selection_changed(self): |
| """Should be called when the selection of the Listbox has changed. |
| Updates the Listbox display and calls _change_start.""" |
| cursel = int(self.listbox.curselection()[0]) |
| |
| self.listbox.see(cursel) |
| |
| lts = self.lasttypedstart |
| selstart = self.completions[cursel] |
| if self._binary_search(lts) == cursel: |
| newstart = lts |
| else: |
| min_len = min(len(lts), len(selstart)) |
| i = 0 |
| while i < min_len and lts[i] == selstart[i]: |
| i += 1 |
| newstart = selstart[:i] |
| self._change_start(newstart) |
| |
| if self.completions[cursel][:len(self.start)] == self.start: |
| # start is a prefix of the selected completion |
| self.listbox.configure(selectbackground=self.origselbackground, |
| selectforeground=self.origselforeground) |
| else: |
| self.listbox.configure(selectbackground=self.listbox.cget("bg"), |
| selectforeground=self.listbox.cget("fg")) |
| # If there are more completions, show them, and call me again. |
| if self.morecompletions: |
| self.completions = self.morecompletions |
| self.morecompletions = None |
| self.listbox.delete(0, END) |
| for item in self.completions: |
| self.listbox.insert(END, item) |
| self.listbox.select_set(self._binary_search(self.start)) |
| self._selection_changed() |
| |
| def show_window(self, comp_lists, index, complete, mode, userWantsWin): |
| """Show the autocomplete list, bind events. |
| If complete is True, complete the text, and if there is exactly one |
| matching completion, don't open a list.""" |
| # Handle the start we already have |
| self.completions, self.morecompletions = comp_lists |
| self.mode = mode |
| self.startindex = self.widget.index(index) |
| self.start = self.widget.get(self.startindex, "insert") |
| if complete: |
| completed = self._complete_string(self.start) |
| self._change_start(completed) |
| i = self._binary_search(completed) |
| if self.completions[i] == completed and \ |
| (i == len(self.completions)-1 or |
| self.completions[i+1][:len(completed)] != completed): |
| # There is exactly one matching completion |
| return |
| self.userwantswindow = userWantsWin |
| self.lasttypedstart = self.start |
| |
| # Put widgets in place |
| self.autocompletewindow = acw = Toplevel(self.widget) |
| # Put it in a position so that it is not seen. |
| acw.wm_geometry("+10000+10000") |
| # Make it float |
| acw.wm_overrideredirect(1) |
| try: |
| # This command is only needed and available on Tk >= 8.4.0 for OSX |
| # Without it, call tips intrude on the typing process by grabbing |
| # the focus. |
| acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w, |
| "help", "noActivates") |
| except TclError: |
| pass |
| self.scrollbar = scrollbar = Scrollbar(acw, orient=VERTICAL) |
| self.listbox = listbox = Listbox(acw, yscrollcommand=scrollbar.set, |
| exportselection=False, bg="white") |
| for item in self.completions: |
| listbox.insert(END, item) |
| self.origselforeground = listbox.cget("selectforeground") |
| self.origselbackground = listbox.cget("selectbackground") |
| scrollbar.config(command=listbox.yview) |
| scrollbar.pack(side=RIGHT, fill=Y) |
| listbox.pack(side=LEFT, fill=BOTH, expand=True) |
| |
| # Initialize the listbox selection |
| self.listbox.select_set(self._binary_search(self.start)) |
| self._selection_changed() |
| |
| # bind events |
| self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME, |
| self.hide_event) |
| for seq in HIDE_SEQUENCES: |
| self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq) |
| self.keypressid = self.widget.bind(KEYPRESS_VIRTUAL_EVENT_NAME, |
| self.keypress_event) |
| for seq in KEYPRESS_SEQUENCES: |
| self.widget.event_add(KEYPRESS_VIRTUAL_EVENT_NAME, seq) |
| self.keyreleaseid = self.widget.bind(KEYRELEASE_VIRTUAL_EVENT_NAME, |
| self.keyrelease_event) |
| self.widget.event_add(KEYRELEASE_VIRTUAL_EVENT_NAME,KEYRELEASE_SEQUENCE) |
| self.listupdateid = listbox.bind(LISTUPDATE_SEQUENCE, |
| self.listselect_event) |
| self.winconfigid = acw.bind(WINCONFIG_SEQUENCE, self.winconfig_event) |
| self.doubleclickid = listbox.bind(DOUBLECLICK_SEQUENCE, |
| self.doubleclick_event) |
| |
| def winconfig_event(self, event): |
| if not self.is_active(): |
| return |
| # Position the completion list window |
| text = self.widget |
| text.see(self.startindex) |
| x, y, cx, cy = text.bbox(self.startindex) |
| acw = self.autocompletewindow |
| acw_width, acw_height = acw.winfo_width(), acw.winfo_height() |
| text_width, text_height = text.winfo_width(), text.winfo_height() |
| new_x = text.winfo_rootx() + min(x, max(0, text_width - acw_width)) |
| new_y = text.winfo_rooty() + y |
| if (text_height - (y + cy) >= acw_height # enough height below |
| or y < acw_height): # not enough height above |
| # place acw below current line |
| new_y += cy |
| else: |
| # place acw above current line |
| new_y -= acw_height |
| acw.wm_geometry("+%d+%d" % (new_x, new_y)) |
| |
| def hide_event(self, event): |
| if not self.is_active(): |
| return |
| self.hide_window() |
| |
| def listselect_event(self, event): |
| if not self.is_active(): |
| return |
| self.userwantswindow = True |
| cursel = int(self.listbox.curselection()[0]) |
| self._change_start(self.completions[cursel]) |
| |
| def doubleclick_event(self, event): |
| # Put the selected completion in the text, and close the list |
| cursel = int(self.listbox.curselection()[0]) |
| self._change_start(self.completions[cursel]) |
| self.hide_window() |
| |
| def keypress_event(self, event): |
| if not self.is_active(): |
| return |
| keysym = event.keysym |
| if hasattr(event, "mc_state"): |
| state = event.mc_state |
| else: |
| state = 0 |
| if keysym != "Tab": |
| self.lastkey_was_tab = False |
| if (len(keysym) == 1 or keysym in ("underscore", "BackSpace") |
| or (self.mode == COMPLETE_FILES and keysym in |
| ("period", "minus"))) \ |
| and not (state & ~MC_SHIFT): |
| # Normal editing of text |
| 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 |
| 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.hide_window() |
| return |
| |
| elif (self.mode == COMPLETE_ATTRIBUTES and keysym in |
| ("period", "space", "parenleft", "parenright", "bracketleft", |
| "bracketright")) or \ |
| (self.mode == COMPLETE_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 == COMPLETE_ATTRIBUTES or self.start): |
| self._change_start(self.completions[cursel]) |
| self.hide_window() |
| return |
| |
| 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 |
| |
| elif any(s in keysym for s in ("Shift", "Control", "Alt", |
| "Meta", "Command", "Option")): |
| # A modifier key, so ignore |
| return |
| |
| else: |
| # Unknown event, close the window and let it through. |
| self.hide_window() |
| return |
| |
| 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 |
| for seq in HIDE_SEQUENCES: |
| self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq) |
| self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid) |
| self.hideid = 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 |
| self.autocompletewindow.unbind(WINCONFIG_SEQUENCE, self.winconfigid) |
| self.winconfigid = None |
| |
| # destroy widgets |
| self.scrollbar.destroy() |
| self.scrollbar = None |
| self.listbox.destroy() |
| self.listbox = None |
| self.autocompletewindow.destroy() |
| self.autocompletewindow = None |