Mercurial > cpython-lru_cache-weakref

annotate Lib/curses/textpad.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents 45b672367b1f
children 787b969d37f0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """Simple textbox editing widget with Emacs-like keybindings."""
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2
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3 import curses
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4 import curses.ascii
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5
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6 def rectangle(win, uly, ulx, lry, lrx):
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7 """Draw a rectangle with corners at the provided upper-left
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8 and lower-right coordinates.
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9 """
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10 win.vline(uly+1, ulx, curses.ACS_VLINE, lry - uly - 1)
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11 win.hline(uly, ulx+1, curses.ACS_HLINE, lrx - ulx - 1)
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12 win.hline(lry, ulx+1, curses.ACS_HLINE, lrx - ulx - 1)
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13 win.vline(uly+1, lrx, curses.ACS_VLINE, lry - uly - 1)
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14 win.addch(uly, ulx, curses.ACS_ULCORNER)
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15 win.addch(uly, lrx, curses.ACS_URCORNER)
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16 win.addch(lry, lrx, curses.ACS_LRCORNER)
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17 win.addch(lry, ulx, curses.ACS_LLCORNER)
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18
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19 class Textbox:
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20 """Editing widget using the interior of a window object.
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21 Supports the following Emacs-like key bindings:
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22
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23 Ctrl-A Go to left edge of window.
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24 Ctrl-B Cursor left, wrapping to previous line if appropriate.
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25 Ctrl-D Delete character under cursor.
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26 Ctrl-E Go to right edge (stripspaces off) or end of line (stripspaces on).
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27 Ctrl-F Cursor right, wrapping to next line when appropriate.
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28 Ctrl-G Terminate, returning the window contents.
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29 Ctrl-H Delete character backward.
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30 Ctrl-J Terminate if the window is 1 line, otherwise insert newline.
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31 Ctrl-K If line is blank, delete it, otherwise clear to end of line.
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32 Ctrl-L Refresh screen.
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33 Ctrl-N Cursor down; move down one line.
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34 Ctrl-O Insert a blank line at cursor location.
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35 Ctrl-P Cursor up; move up one line.
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36
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37 Move operations do nothing if the cursor is at an edge where the movement
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38 is not possible. The following synonyms are supported where possible:
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39
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40 KEY_LEFT = Ctrl-B, KEY_RIGHT = Ctrl-F, KEY_UP = Ctrl-P, KEY_DOWN = Ctrl-N
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41 KEY_BACKSPACE = Ctrl-h
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42 """
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43 def __init__(self, win, insert_mode=False):
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44 self.win = win
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45 self.insert_mode = insert_mode
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46 (self.maxy, self.maxx) = win.getmaxyx()
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47 self.maxy = self.maxy - 1
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48 self.maxx = self.maxx - 1
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49 self.stripspaces = 1
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50 self.lastcmd = None
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51 win.keypad(1)
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52
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53 def _end_of_line(self, y):
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54 """Go to the location of the first blank on the given line,
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55 returning the index of the last non-blank character."""
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56 last = self.maxx
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57 while True:
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58 if curses.ascii.ascii(self.win.inch(y, last)) != curses.ascii.SP:
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59 last = min(self.maxx, last+1)
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60 break
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61 elif last == 0:
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62 break
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63 last = last - 1
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64 return last
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65
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66 def _insert_printable_char(self, ch):
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67 (y, x) = self.win.getyx()
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68 if y < self.maxy or x < self.maxx:
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69 if self.insert_mode:
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70 oldch = self.win.inch()
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71 # The try-catch ignores the error we trigger from some curses
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72 # versions by trying to write into the lowest-rightmost spot
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73 # in the window.
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74 try:
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75 self.win.addch(ch)
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76 except curses.error:
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77 pass
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78 if self.insert_mode:
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79 (backy, backx) = self.win.getyx()
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80 if curses.ascii.isprint(oldch):
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81 self._insert_printable_char(oldch)
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82 self.win.move(backy, backx)
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83
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84 def do_command(self, ch):
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85 "Process a single editing command."
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86 (y, x) = self.win.getyx()
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87 self.lastcmd = ch
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88 if curses.ascii.isprint(ch):
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89 if y < self.maxy or x < self.maxx:
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90 self._insert_printable_char(ch)
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91 elif ch == curses.ascii.SOH: # ^a
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92 self.win.move(y, 0)
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93 elif ch in (curses.ascii.STX,curses.KEY_LEFT, curses.ascii.BS,curses.KEY_BACKSPACE):
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94 if x > 0:
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95 self.win.move(y, x-1)
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96 elif y == 0:
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97 pass
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98 elif self.stripspaces:
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99 self.win.move(y-1, self._end_of_line(y-1))
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100 else:
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101 self.win.move(y-1, self.maxx)
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102 if ch in (curses.ascii.BS, curses.KEY_BACKSPACE):
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103 self.win.delch()
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104 elif ch == curses.ascii.EOT: # ^d
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105 self.win.delch()
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106 elif ch == curses.ascii.ENQ: # ^e
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107 if self.stripspaces:
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108 self.win.move(y, self._end_of_line(y))
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109 else:
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110 self.win.move(y, self.maxx)
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111 elif ch in (curses.ascii.ACK, curses.KEY_RIGHT): # ^f
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112 if x < self.maxx:
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113 self.win.move(y, x+1)
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114 elif y == self.maxy:
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115 pass
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116 else:
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117 self.win.move(y+1, 0)
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118 elif ch == curses.ascii.BEL: # ^g
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119 return 0
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120 elif ch == curses.ascii.NL: # ^j
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121 if self.maxy == 0:
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122 return 0
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123 elif y < self.maxy:
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124 self.win.move(y+1, 0)
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125 elif ch == curses.ascii.VT: # ^k
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126 if x == 0 and self._end_of_line(y) == 0:
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127 self.win.deleteln()
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128 else:
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129 # first undo the effect of self._end_of_line
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130 self.win.move(y, x)
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131 self.win.clrtoeol()
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132 elif ch == curses.ascii.FF: # ^l
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133 self.win.refresh()
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134 elif ch in (curses.ascii.SO, curses.KEY_DOWN): # ^n
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135 if y < self.maxy:
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136 self.win.move(y+1, x)
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137 if x > self._end_of_line(y+1):
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138 self.win.move(y+1, self._end_of_line(y+1))
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139 elif ch == curses.ascii.SI: # ^o
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140 self.win.insertln()
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141 elif ch in (curses.ascii.DLE, curses.KEY_UP): # ^p
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142 if y > 0:
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143 self.win.move(y-1, x)
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144 if x > self._end_of_line(y-1):
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145 self.win.move(y-1, self._end_of_line(y-1))
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146 return 1
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147
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148 def gather(self):
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149 "Collect and return the contents of the window."
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150 result = ""
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151 for y in range(self.maxy+1):
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152 self.win.move(y, 0)
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153 stop = self._end_of_line(y)
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154 if stop == 0 and self.stripspaces:
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155 continue
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156 for x in range(self.maxx+1):
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157 if self.stripspaces and x > stop:
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158 break
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159 result = result + chr(curses.ascii.ascii(self.win.inch(y, x)))
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160 if self.maxy > 0:
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161 result = result + "\n"
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162 return result
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163
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164 def edit(self, validate=None):
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165 "Edit in the widget window and collect the results."
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166 while 1:
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167 ch = self.win.getch()
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168 if validate:
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169 ch = validate(ch)
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170 if not ch:
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171 continue
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172 if not self.do_command(ch):
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173 break
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174 self.win.refresh()
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175 return self.gather()
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176
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177 if __name__ == '__main__':
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178 def test_editbox(stdscr):
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179 ncols, nlines = 9, 4
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180 uly, ulx = 15, 20
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181 stdscr.addstr(uly-2, ulx, "Use Ctrl-G to end editing.")
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182 win = curses.newwin(nlines, ncols, uly, ulx)
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183 rectangle(stdscr, uly-1, ulx-1, uly + nlines, ulx + ncols)
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184 stdscr.refresh()
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185 return Textbox(win).edit()
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186
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187 str = curses.wrapper(test_editbox)
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188 print 'Contents of text box:', repr(str)