annotate Lib/idlelib/AutoCompleteWindow.py @ 80661:94de77bd0b4b 2.7

Issue #16194: document imp.load_dynamic problems when read several extension modules from the same binary object file.
author Andrew Svetlov <andrew.svetlov@gmail.com>
date Thu, 29 Nov 2012 19:51:28 +0200
parents 787b969d37f0
children 8d320204d5d6
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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 self._change_start(completed)
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161 i = self._binary_search(completed)
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162 if self.completions[i] == completed and \
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163 (i == len(self.completions)-1 or
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164 self.completions[i+1][:len(completed)] != completed):
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165 # There is exactly one matching completion
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166 return
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167 self.userwantswindow = userWantsWin
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168 self.lasttypedstart = self.start
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169
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170 # Put widgets in place
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171 self.autocompletewindow = acw = Toplevel(self.widget)
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172 # Put it in a position so that it is not seen.
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173 acw.wm_geometry("+10000+10000")
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174 # Make it float
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175 acw.wm_overrideredirect(1)
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176 try:
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177 # This command is only needed and available on Tk >= 8.4.0 for OSX
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178 # Without it, call tips intrude on the typing process by grabbing
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179 # the focus.
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180 acw.tk.call("::tk::unsupported::MacWindowStyle", "style", acw._w,
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181 "help", "noActivates")
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182 except TclError:
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183 pass
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184 self.scrollbar = scrollbar = Scrollbar(acw, orient=VERTICAL)
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185 self.listbox = listbox = Listbox(acw, yscrollcommand=scrollbar.set,
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186 exportselection=False, bg="white")
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187 for item in self.completions:
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188 listbox.insert(END, item)
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189 self.origselforeground = listbox.cget("selectforeground")
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190 self.origselbackground = listbox.cget("selectbackground")
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191 scrollbar.config(command=listbox.yview)
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192 scrollbar.pack(side=RIGHT, fill=Y)
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193 listbox.pack(side=LEFT, fill=BOTH, expand=True)
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194
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195 # Initialize the listbox selection
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196 self.listbox.select_set(self._binary_search(self.start))
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197 self._selection_changed()
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198
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199 # bind events
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200 self.hideid = self.widget.bind(HIDE_VIRTUAL_EVENT_NAME,
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201 self.hide_event)
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202 for seq in HIDE_SEQUENCES:
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203 self.widget.event_add(HIDE_VIRTUAL_EVENT_NAME, seq)
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204 self.keypressid = self.widget.bind(KEYPRESS_VIRTUAL_EVENT_NAME,
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205 self.keypress_event)
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206 for seq in KEYPRESS_SEQUENCES:
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207 self.widget.event_add(KEYPRESS_VIRTUAL_EVENT_NAME, seq)
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208 self.keyreleaseid = self.widget.bind(KEYRELEASE_VIRTUAL_EVENT_NAME,
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209 self.keyrelease_event)
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210 self.widget.event_add(KEYRELEASE_VIRTUAL_EVENT_NAME,KEYRELEASE_SEQUENCE)
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211 self.listupdateid = listbox.bind(LISTUPDATE_SEQUENCE,
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212 self.listselect_event)
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213 self.winconfigid = acw.bind(WINCONFIG_SEQUENCE, self.winconfig_event)
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214 self.doubleclickid = listbox.bind(DOUBLECLICK_SEQUENCE,
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215 self.doubleclick_event)
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216
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217 def winconfig_event(self, event):
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218 if not self.is_active():
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219 return
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220 # Position the completion list window
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221 text = self.widget
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222 text.see(self.startindex)
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223 x, y, cx, cy = text.bbox(self.startindex)
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224 acw = self.autocompletewindow
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225 acw_width, acw_height = acw.winfo_width(), acw.winfo_height()
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226 text_width, text_height = text.winfo_width(), text.winfo_height()
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227 new_x = text.winfo_rootx() + min(x, max(0, text_width - acw_width))
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228 new_y = text.winfo_rooty() + y
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229 if (text_height - (y + cy) >= acw_height # enough height below
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230 or y < acw_height): # not enough height above
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231 # place acw below current line
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232 new_y += cy
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233 else:
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234 # place acw above current line
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235 new_y -= acw_height
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236 acw.wm_geometry("+%d+%d" % (new_x, new_y))
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237
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238 def hide_event(self, event):
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239 if not self.is_active():
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240 return
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241 self.hide_window()
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242
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243 def listselect_event(self, event):
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244 if not self.is_active():
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245 return
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246 self.userwantswindow = True
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247 cursel = int(self.listbox.curselection()[0])
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248 self._change_start(self.completions[cursel])
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249
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250 def doubleclick_event(self, event):
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251 # Put the selected completion in the text, and close the list
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252 cursel = int(self.listbox.curselection()[0])
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253 self._change_start(self.completions[cursel])
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254 self.hide_window()
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255
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256 def keypress_event(self, event):
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257 if not self.is_active():
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258 return
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259 keysym = event.keysym
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260 if hasattr(event, "mc_state"):
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261 state = event.mc_state
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262 else:
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263 state = 0
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264 if keysym != "Tab":
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265 self.lastkey_was_tab = False
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266 if (len(keysym) == 1 or keysym in ("underscore", "BackSpace")
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267 or (self.mode == COMPLETE_FILES and keysym in
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268 ("period", "minus"))) \
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269 and not (state & ~MC_SHIFT):
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270 # Normal editing of text
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271 if len(keysym) == 1:
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272 self._change_start(self.start + keysym)
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273 elif keysym == "underscore":
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274 self._change_start(self.start + '_')
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275 elif keysym == "period":
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276 self._change_start(self.start + '.')
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277 elif keysym == "minus":
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278 self._change_start(self.start + '-')
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279 else:
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280 # keysym == "BackSpace"
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281 if len(self.start) == 0:
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282 self.hide_window()
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283 return
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284 self._change_start(self.start[:-1])
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285 self.lasttypedstart = self.start
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286 self.listbox.select_clear(0, int(self.listbox.curselection()[0]))
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287 self.listbox.select_set(self._binary_search(self.start))
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288 self._selection_changed()
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289 return "break"
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290
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291 elif keysym == "Return":
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292 self.hide_window()
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293 return
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294
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295 elif (self.mode == COMPLETE_ATTRIBUTES and keysym in
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296 ("period", "space", "parenleft", "parenright", "bracketleft",
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297 "bracketright")) or \
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298 (self.mode == COMPLETE_FILES and keysym in
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299 ("slash", "backslash", "quotedbl", "apostrophe")) \
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300 and not (state & ~MC_SHIFT):
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301 # If start is a prefix of the selection, but is not '' when
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302 # completing file names, put the whole
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diff changeset
303 # selected completion. Anyway, close the list.
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304 cursel = int(self.listbox.curselection()[0])
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305 if self.completions[cursel][:len(self.start)] == self.start \
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306 and (self.mode == COMPLETE_ATTRIBUTES or self.start):
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307 self._change_start(self.completions[cursel])
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308 self.hide_window()
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309 return
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310
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311 elif keysym in ("Home", "End", "Prior", "Next", "Up", "Down") and \
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312 not state:
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313 # Move the selection in the listbox
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314 self.userwantswindow = True
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315 cursel = int(self.listbox.curselection()[0])
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316 if keysym == "Home":
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317 newsel = 0
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318 elif keysym == "End":
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319 newsel = len(self.completions)-1
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320 elif keysym in ("Prior", "Next"):
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321 jump = self.listbox.nearest(self.listbox.winfo_height()) - \
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322 self.listbox.nearest(0)
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323 if keysym == "Prior":
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324 newsel = max(0, cursel-jump)
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325 else:
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326 assert keysym == "Next"
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327 newsel = min(len(self.completions)-1, cursel+jump)
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328 elif keysym == "Up":
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329 newsel = max(0, cursel-1)
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330 else:
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331 assert keysym == "Down"
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332 newsel = min(len(self.completions)-1, cursel+1)
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333 self.listbox.select_clear(cursel)
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334 self.listbox.select_set(newsel)
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335 self._selection_changed()
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336 self._change_start(self.completions[newsel])
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337 return "break"
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338
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339 elif (keysym == "Tab" and not state):
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340 if self.lastkey_was_tab:
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341 # two tabs in a row; insert current selection and close acw
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342 cursel = int(self.listbox.curselection()[0])
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343 self._change_start(self.completions[cursel])
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344 self.hide_window()
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345 return "break"
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346 else:
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347 # first tab; let AutoComplete handle the completion
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348 self.userwantswindow = True
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349 self.lastkey_was_tab = True
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350 return
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351
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352 elif any(s in keysym for s in ("Shift", "Control", "Alt",
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353 "Meta", "Command", "Option")):
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354 # A modifier key, so ignore
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355 return
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parents:
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356
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357 else:
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358 # Unknown event, close the window and let it through.
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359 self.hide_window()
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360 return
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361
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362 def keyrelease_event(self, event):
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363 if not self.is_active():
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364 return
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365 if self.widget.index("insert") != \
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366 self.widget.index("%s+%dc" % (self.startindex, len(self.start))):
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parents:
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367 # If we didn't catch an event which moved the insert, close window
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368 self.hide_window()
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diff changeset
369
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370 def is_active(self):
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diff changeset
371 return self.autocompletewindow is not None
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372
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373 def complete(self):
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374 self._change_start(self._complete_string(self.start))
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diff changeset
375 # The selection doesn't change.
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376
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377 def hide_window(self):
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diff changeset
378 if not self.is_active():
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parents:
diff changeset
379 return
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parents:
diff changeset
380
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381 # unbind events
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382 for seq in HIDE_SEQUENCES:
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383 self.widget.event_delete(HIDE_VIRTUAL_EVENT_NAME, seq)
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parents:
diff changeset
384 self.widget.unbind(HIDE_VIRTUAL_EVENT_NAME, self.hideid)
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parents:
diff changeset
385 self.hideid = None
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386 for seq in KEYPRESS_SEQUENCES:
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diff changeset
387 self.widget.event_delete(KEYPRESS_VIRTUAL_EVENT_NAME, seq)
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388 self.widget.unbind(KEYPRESS_VIRTUAL_EVENT_NAME, self.keypressid)
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389 self.keypressid = None
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390 self.widget.event_delete(KEYRELEASE_VIRTUAL_EVENT_NAME,
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391 KEYRELEASE_SEQUENCE)
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392 self.widget.unbind(KEYRELEASE_VIRTUAL_EVENT_NAME, self.keyreleaseid)
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393 self.keyreleaseid = None
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394 self.listbox.unbind(LISTUPDATE_SEQUENCE, self.listupdateid)
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395 self.listupdateid = None
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396 self.autocompletewindow.unbind(WINCONFIG_SEQUENCE, self.winconfigid)
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397 self.winconfigid = None
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398
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399 # destroy widgets
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400 self.scrollbar.destroy()
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401 self.scrollbar = None
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402 self.listbox.destroy()
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403 self.listbox = None
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404 self.autocompletewindow.destroy()
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405 self.autocompletewindow = None