Mercurial > cpython-lru_cache-weakref
annotate Lib/idlelib/AutoCompleteWindow.py @ 87690:66c1c9f32567 default tip
Add use_weakref option to functools.lru_cache
The use_weakref option makes lru_cache create weak references to the function
arguments when creating the cache key, which prevents them from staying in the
memory forever even after all other references to them are gone.
This is a proof of concept for http://bugs.python.org/issue19859
| author | Radomir Dopieralski <devel@sheep.art.pl> |
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| date | Tue, 03 Dec 2013 16:02:48 +0100 |
| parents | c882395e8ed8 |
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| rev | line source |
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1 """ |
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2 An auto-completion window for IDLE, used by the AutoComplete extension |
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3 """ |
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4 from tkinter import * |
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5 from idlelib.MultiCall import MC_SHIFT |
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6 from idlelib.AutoComplete import COMPLETE_FILES, COMPLETE_ATTRIBUTES |
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7 |
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8 HIDE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-hide>>" |
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9 HIDE_SEQUENCES = ("<FocusOut>", "<ButtonPress>") |
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10 KEYPRESS_VIRTUAL_EVENT_NAME = "<<autocompletewindow-keypress>>" |
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11 # We need to bind event beyond <Key> so that the function will be called |
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12 # before the default specific IDLE function |
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13 KEYPRESS_SEQUENCES = ("<Key>", "<Key-BackSpace>", "<Key-Return>", "<Key-Tab>", |
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14 "<Key-Up>", "<Key-Down>", "<Key-Home>", "<Key-End>", |
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15 "<Key-Prior>", "<Key-Next>") |
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16 KEYRELEASE_VIRTUAL_EVENT_NAME = "<<autocompletewindow-keyrelease>>" |
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17 KEYRELEASE_SEQUENCE = "<KeyRelease>" |
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18 LISTUPDATE_SEQUENCE = "<B1-ButtonRelease>" |
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19 WINCONFIG_SEQUENCE = "<Configure>" |
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20 DOUBLECLICK_SEQUENCE = "<B1-Double-ButtonRelease>" |
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21 |
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22 class AutoCompleteWindow: |
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23 |
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24 def __init__(self, widget): |
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25 # The widget (Text) on which we place the AutoCompleteWindow |
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26 self.widget = widget |
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27 # The widgets we create |
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28 self.autocompletewindow = self.listbox = self.scrollbar = None |
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29 # The default foreground and background of a selection. Saved because |
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30 # they are changed to the regular colors of list items when the |
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31 # completion start is not a prefix of the selected completion |
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32 self.origselforeground = self.origselbackground = None |
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33 # The list of completions |
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34 self.completions = None |
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35 # A list with more completions, or None |
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36 self.morecompletions = None |
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37 # The completion mode. Either AutoComplete.COMPLETE_ATTRIBUTES or |
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38 # AutoComplete.COMPLETE_FILES |
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39 self.mode = None |
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40 # The current completion start, on the text box (a string) |
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41 self.start = None |
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42 # The index of the start of the completion |
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43 self.startindex = None |
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44 # The last typed start, used so that when the selection changes, |
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45 # the new start will be as close as possible to the last typed one. |
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46 self.lasttypedstart = None |
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47 # Do we have an indication that the user wants the completion window |
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48 # (for example, he clicked the list) |
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49 self.userwantswindow = None |
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50 # event ids |
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51 self.hideid = self.keypressid = self.listupdateid = self.winconfigid \ |
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52 = self.keyreleaseid = self.doubleclickid = None |
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53 # Flag set if last keypress was a tab |
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54 self.lastkey_was_tab = False |
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55 |
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56 def _change_start(self, newstart): |
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57 min_len = min(len(self.start), len(newstart)) |
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58 i = 0 |
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59 while i < min_len and self.start[i] == newstart[i]: |
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60 i += 1 |
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61 if i < len(self.start): |
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62 self.widget.delete("%s+%dc" % (self.startindex, i), |
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63 "%s+%dc" % (self.startindex, len(self.start))) |
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64 if i < len(newstart): |
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65 self.widget.insert("%s+%dc" % (self.startindex, i), |
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66 newstart[i:]) |
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67 self.start = newstart |
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68 |
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69 def _binary_search(self, s): |
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70 """Find the first index in self.completions where completions[i] is |
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71 greater or equal to s, or the last index if there is no such |
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72 one.""" |
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73 i = 0; j = len(self.completions) |
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74 while j > i: |
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75 m = (i + j) // 2 |
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76 if self.completions[m] >= s: |
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77 j = m |
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78 else: |
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79 i = m + 1 |
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80 return min(i, len(self.completions)-1) |
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81 |
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82 def _complete_string(self, s): |
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83 """Assuming that s is the prefix of a string in self.completions, |
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84 return the longest string which is a prefix of all the strings which |
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85 s is a prefix of them. If s is not a prefix of a string, return s.""" |
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86 first = self._binary_search(s) |
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87 if self.completions[first][:len(s)] != s: |
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88 # There is not even one completion which s is a prefix of. |
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89 return s |
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90 # Find the end of the range of completions where s is a prefix of. |
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91 i = first + 1 |
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92 j = len(self.completions) |
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93 while j > i: |
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94 m = (i + j) // 2 |
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95 if self.completions[m][:len(s)] != s: |
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96 j = m |
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97 else: |
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98 i = m + 1 |
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99 last = i-1 |
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100 |
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101 if first == last: # only one possible completion |
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102 return self.completions[first] |
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103 |
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104 # We should return the maximum prefix of first and last |
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105 first_comp = self.completions[first] |
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106 last_comp = self.completions[last] |
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107 min_len = min(len(first_comp), len(last_comp)) |
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108 i = len(s) |
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109 while i < min_len and first_comp[i] == last_comp[i]: |
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110 i += 1 |
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111 return first_comp[:i] |
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112 |
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113 def _selection_changed(self): |
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114 """Should be called when the selection of the Listbox has changed. |
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115 Updates the Listbox display and calls _change_start.""" |
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116 cursel = int(self.listbox.curselection()[0]) |
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117 |
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118 self.listbox.see(cursel) |
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119 |
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120 lts = self.lasttypedstart |
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121 selstart = self.completions[cursel] |
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122 if self._binary_search(lts) == cursel: |
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123 newstart = lts |
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124 else: |
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125 min_len = min(len(lts), len(selstart)) |
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126 i = 0 |
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127 while i < min_len and lts[i] == selstart[i]: |
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128 i += 1 |
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129 newstart = selstart[:i] |
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130 self._change_start(newstart) |
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131 |
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132 if self.completions[cursel][:len(self.start)] == self.start: |
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133 # start is a prefix of the selected completion |
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134 self.listbox.configure(selectbackground=self.origselbackground, |
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135 selectforeground=self.origselforeground) |
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136 else: |
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137 self.listbox.configure(selectbackground=self.listbox.cget("bg"), |
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138 selectforeground=self.listbox.cget("fg")) |
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139 # If there are more completions, show them, and call me again. |
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140 if self.morecompletions: |
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141 self.completions = self.morecompletions |
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142 self.morecompletions = None |
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143 self.listbox.delete(0, END) |
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144 for item in self.completions: |
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145 self.listbox.insert(END, item) |
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146 self.listbox.select_set(self._binary_search(self.start)) |
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147 self._selection_changed() |
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148 |
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149 def show_window(self, comp_lists, index, complete, mode, userWantsWin): |
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150 """Show the autocomplete list, bind events. |
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151 If complete is True, complete the text, and if there is exactly one |
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152 matching completion, don't open a list.""" |
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153 # Handle the start we already have |
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154 self.completions, self.morecompletions = comp_lists |
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155 self.mode = mode |
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156 self.startindex = self.widget.index(index) |
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157 self.start = self.widget.get(self.startindex, "insert") |
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158 if complete: |
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159 completed = self._complete_string(self.start) |
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160 start = self.start |
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161 self._change_start(completed) |
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162 i = self._binary_search(completed) |
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163 if self.completions[i] == completed and \ |
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164 (i == len(self.completions)-1 or |
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165 self.completions[i+1][:len(completed)] != completed): |
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166 # There is exactly one matching completion |
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167 return completed == start |
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168 self.userwantswindow = userWantsWin |
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169 self.lasttypedstart = self.start |
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170 |
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171 # Put widgets in place |
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172 self.autocompletewindow = acw = Toplevel(self.widget) |
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173 # Put it in a position so that it is not seen. |
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174 acw.wm_geometry("+10000+10000") |
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175 # Make it float |
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176 acw.wm_overrideredirect(1) |
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177 try: |
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178 # This command is only needed and available on Tk >= 8.4.0 for OSX |
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179 # Without it, call tips intrude on the typing process by grabbing |
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180 # the focus. |
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181 acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w, |
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182 "help", "noActivates") |
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183 except TclError: |
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184 pass |
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185 self.scrollbar = scrollbar = Scrollbar(acw, orient=VERTICAL) |
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186 self.listbox = listbox = Listbox(acw, yscrollcommand=scrollbar.set, |
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187 exportselection=False, bg="white") |
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188 for item in self.completions: |
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189 listbox.insert(END, item) |
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190 self.origselforeground = listbox.cget("selectforeground") |
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191 self.origselbackground = listbox.cget("selectbackground") |
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192 scrollbar.config(command=listbox.yview) |
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193 scrollbar.pack(side=RIGHT, fill=Y) |
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194 listbox.pack(side=LEFT, fill=BOTH, expand=True) |
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195 |
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196 # Initialize the listbox selection |
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197 self.listbox.select_set(self._binary_search(self.start)) |
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198 self._selection_changed() |
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199 |
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200 # bind events |
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201 self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME, |
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202 self.hide_event) |
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203 for seq in HIDE_SEQUENCES: |
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204 self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq) |
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205 self.keypressid = self.widget.bind(KEYPRESS_VIRTUAL_EVENT_NAME, |
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206 self.keypress_event) |
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207 for seq in KEYPRESS_SEQUENCES: |
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208 self.widget.event_add(KEYPRESS_VIRTUAL_EVENT_NAME, seq) |
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209 self.keyreleaseid = self.widget.bind(KEYRELEASE_VIRTUAL_EVENT_NAME, |
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210 self.keyrelease_event) |
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211 self.widget.event_add(KEYRELEASE_VIRTUAL_EVENT_NAME,KEYRELEASE_SEQUENCE) |
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212 self.listupdateid = listbox.bind(LISTUPDATE_SEQUENCE, |
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213 self.listselect_event) |
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214 self.winconfigid = acw.bind(WINCONFIG_SEQUENCE, self.winconfig_event) |
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215 self.doubleclickid = listbox.bind(DOUBLECLICK_SEQUENCE, |
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216 self.doubleclick_event) |
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217 |
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218 def winconfig_event(self, event): |
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219 if not self.is_active(): |
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220 return |
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221 # Position the completion list window |
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222 text = self.widget |
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223 text.see(self.startindex) |
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224 x, y, cx, cy = text.bbox(self.startindex) |
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225 acw = self.autocompletewindow |
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226 acw_width, acw_height = acw.winfo_width(), acw.winfo_height() |
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227 text_width, text_height = text.winfo_width(), text.winfo_height() |
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228 new_x = text.winfo_rootx() + min(x, max(0, text_width - acw_width)) |
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229 new_y = text.winfo_rooty() + y |
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230 if (text_height - (y + cy) >= acw_height # enough height below |
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231 or y < acw_height): # not enough height above |
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232 # place acw below current line |
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233 new_y += cy |
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234 else: |
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235 # place acw above current line |
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236 new_y -= acw_height |
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237 acw.wm_geometry("+%d+%d" % (new_x, new_y)) |
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238 |
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239 def hide_event(self, event): |
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240 if not self.is_active(): |
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241 return |
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242 self.hide_window() |
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243 |
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244 def listselect_event(self, event): |
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245 if not self.is_active(): |
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246 return |
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247 self.userwantswindow = True |
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248 cursel = int(self.listbox.curselection()[0]) |
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249 self._change_start(self.completions[cursel]) |
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250 |
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251 def doubleclick_event(self, event): |
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252 # Put the selected completion in the text, and close the list |
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253 cursel = int(self.listbox.curselection()[0]) |
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254 self._change_start(self.completions[cursel]) |
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255 self.hide_window() |
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256 |
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257 def keypress_event(self, event): |
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258 if not self.is_active(): |
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259 return |
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260 keysym = event.keysym |
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261 if hasattr(event, "mc_state"): |
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262 state = event.mc_state |
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263 else: |
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264 state = 0 |
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265 if keysym != "Tab": |
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266 self.lastkey_was_tab = False |
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267 if (len(keysym) == 1 or keysym in ("underscore", "BackSpace") |
| 42516 | 268 or (self.mode == COMPLETE_FILES and keysym in |
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269 ("period", "minus"))) \ |
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270 and not (state & ~MC_SHIFT): |
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271 # Normal editing of text |
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272 if len(keysym) == 1: |
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273 self._change_start(self.start + keysym) |
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274 elif keysym == "underscore": |
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275 self._change_start(self.start + '_') |
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276 elif keysym == "period": |
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277 self._change_start(self.start + '.') |
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278 elif keysym == "minus": |
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279 self._change_start(self.start + '-') |
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280 else: |
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281 # keysym == "BackSpace" |
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282 if len(self.start) == 0: |
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283 self.hide_window() |
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284 return |
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285 self._change_start(self.start[:-1]) |
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286 self.lasttypedstart = self.start |
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287 self.listbox.select_clear(0, int(self.listbox.curselection()[0])) |
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288 self.listbox.select_set(self._binary_search(self.start)) |
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289 self._selection_changed() |
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290 return "break" |
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291 |
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292 elif keysym == "Return": |
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293 self.hide_window() |
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294 return |
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295 |
| 42516 | 296 elif (self.mode == COMPLETE_ATTRIBUTES and keysym in |
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297 ("period", "space", "parenleft", "parenright", "bracketleft", |
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298 "bracketright")) or \ |
| 42516 | 299 (self.mode == COMPLETE_FILES and keysym in |
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300 ("slash", "backslash", "quotedbl", "apostrophe")) \ |
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301 and not (state & ~MC_SHIFT): |
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302 # If start is a prefix of the selection, but is not '' when |
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303 # completing file names, put the whole |
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304 # selected completion. Anyway, close the list. |
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305 cursel = int(self.listbox.curselection()[0]) |
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306 if self.completions[cursel][:len(self.start)] == self.start \ |
| 42516 | 307 and (self.mode == COMPLETE_ATTRIBUTES or self.start): |
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308 self._change_start(self.completions[cursel]) |
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309 self.hide_window() |
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310 return |
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311 |
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312 elif keysym in ("Home", "End", "Prior", "Next", "Up", "Down") and \ |
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313 not state: |
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314 # Move the selection in the listbox |
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315 self.userwantswindow = True |
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316 cursel = int(self.listbox.curselection()[0]) |
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317 if keysym == "Home": |
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318 newsel = 0 |
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319 elif keysym == "End": |
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320 newsel = len(self.completions)-1 |
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321 elif keysym in ("Prior", "Next"): |
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322 jump = self.listbox.nearest(self.listbox.winfo_height()) - \ |
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323 self.listbox.nearest(0) |
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324 if keysym == "Prior": |
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325 newsel = max(0, cursel-jump) |
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326 else: |
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327 assert keysym == "Next" |
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328 newsel = min(len(self.completions)-1, cursel+jump) |
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329 elif keysym == "Up": |
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330 newsel = max(0, cursel-1) |
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331 else: |
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332 assert keysym == "Down" |
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333 newsel = min(len(self.completions)-1, cursel+1) |
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334 self.listbox.select_clear(cursel) |
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335 self.listbox.select_set(newsel) |
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336 self._selection_changed() |
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337 self._change_start(self.completions[newsel]) |
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338 return "break" |
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339 |
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340 elif (keysym == "Tab" and not state): |
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341 if self.lastkey_was_tab: |
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342 # two tabs in a row; insert current selection and close acw |
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343 cursel = int(self.listbox.curselection()[0]) |
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344 self._change_start(self.completions[cursel]) |
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345 self.hide_window() |
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346 return "break" |
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347 else: |
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348 # first tab; let AutoComplete handle the completion |
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349 self.userwantswindow = True |
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350 self.lastkey_was_tab = True |
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351 return |
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352 |
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353 elif any(s in keysym for s in ("Shift", "Control", "Alt", |
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354 "Meta", "Command", "Option")): |
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355 # A modifier key, so ignore |
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356 return |
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357 |
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358 elif event.char and event.char >= ' ': |
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359 # Regular character with a non-length-1 keycode |
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360 self._change_start(self.start + event.char) |
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361 self.lasttypedstart = self.start |
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362 self.listbox.select_clear(0, int(self.listbox.curselection()[0])) |
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363 self.listbox.select_set(self._binary_search(self.start)) |
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364 self._selection_changed() |
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365 return "break" |
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366 |
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367 else: |
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368 # Unknown event, close the window and let it through. |
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369 self.hide_window() |
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370 return |
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371 |
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372 def keyrelease_event(self, event): |
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373 if not self.is_active(): |
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374 return |
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375 if self.widget.index("insert") != \ |
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376 self.widget.index("%s+%dc" % (self.startindex, len(self.start))): |
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377 # If we didn't catch an event which moved the insert, close window |
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378 self.hide_window() |
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379 |
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380 def is_active(self): |
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381 return self.autocompletewindow is not None |
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382 |
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383 def complete(self): |
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384 self._change_start(self._complete_string(self.start)) |
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385 # The selection doesn't change. |
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386 |
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387 def hide_window(self): |
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388 if not self.is_active(): |
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389 return |
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390 |
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391 # unbind events |
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392 for seq in HIDE_SEQUENCES: |
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393 self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq) |
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394 self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid) |
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395 self.hideid = None |
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396 for seq in KEYPRESS_SEQUENCES: |
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397 self.widget.event_delete(KEYPRESS_VIRTUAL_EVENT_NAME, seq) |
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398 self.widget.unbind(KEYPRESS_VIRTUAL_EVENT_NAME, self.keypressid) |
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399 self.keypressid = None |
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400 self.widget.event_delete(KEYRELEASE_VIRTUAL_EVENT_NAME, |
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401 KEYRELEASE_SEQUENCE) |
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402 self.widget.unbind(KEYRELEASE_VIRTUAL_EVENT_NAME, self.keyreleaseid) |
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403 self.keyreleaseid = None |
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404 self.listbox.unbind(LISTUPDATE_SEQUENCE, self.listupdateid) |
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405 self.listupdateid = None |
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406 self.autocompletewindow.unbind(WINCONFIG_SEQUENCE, self.winconfigid) |
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407 self.winconfigid = None |
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408 |
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409 # destroy widgets |
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410 self.scrollbar.destroy() |
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411 self.scrollbar = None |
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412 self.listbox.destroy() |
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413 self.listbox = None |
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414 self.autocompletewindow.destroy() |
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|
415 self.autocompletewindow = None |