Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-tk/FileDialog.py @ 25838:8540887bcec6 2.2

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Backport of 2.183: Fix memory leak in add_subclass() found by NealN with valgrind.
author Guido van Rossum <guido@python.org>
date Fri, 18 Oct 2002 13:42:21 +0000
parents 5b727ab37092
children c404879cf999
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1 """File selection dialog classes.
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2
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3 Classes:
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4
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5 - FileDialog
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6 - LoadFileDialog
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7 - SaveFileDialog
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8
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9 """
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10
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11 from Tkinter import *
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12 from Dialog import Dialog
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13
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14 import os
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15 import fnmatch
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16
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17
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18 dialogstates = {}
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19
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20
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21 class FileDialog:
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22
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23 """Standard file selection dialog -- no checks on selected file.
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24
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25 Usage:
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26
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27 d = FileDialog(master)
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28 file = d.go(dir_or_file, pattern, default, key)
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29 if file is None: ...canceled...
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30 else: ...open file...
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31
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32 All arguments to go() are optional.
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33
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34 The 'key' argument specifies a key in the global dictionary
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35 'dialogstates', which keeps track of the values for the directory
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36 and pattern arguments, overriding the values passed in (it does
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37 not keep track of the default argument!). If no key is specified,
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38 the dialog keeps no memory of previous state. Note that memory is
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39 kept even when the dialog is canceled. (All this emulates the
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40 behavior of the Macintosh file selection dialogs.)
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41
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42 """
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43
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44 title = "File Selection Dialog"
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45
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46 def __init__(self, master, title=None):
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47 if title is None: title = self.title
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48 self.master = master
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49 self.directory = None
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50
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51 self.top = Toplevel(master)
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52 self.top.title(title)
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53 self.top.iconname(title)
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54
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55 self.botframe = Frame(self.top)
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56 self.botframe.pack(side=BOTTOM, fill=X)
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57
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58 self.selection = Entry(self.top)
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59 self.selection.pack(side=BOTTOM, fill=X)
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60 self.selection.bind('<Return>', self.ok_event)
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61
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62 self.filter = Entry(self.top)
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63 self.filter.pack(side=TOP, fill=X)
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64 self.filter.bind('<Return>', self.filter_command)
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65
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66 self.midframe = Frame(self.top)
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67 self.midframe.pack(expand=YES, fill=BOTH)
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68
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69 self.filesbar = Scrollbar(self.midframe)
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70 self.filesbar.pack(side=RIGHT, fill=Y)
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71 self.files = Listbox(self.midframe, exportselection=0,
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72 yscrollcommand=(self.filesbar, 'set'))
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73 self.files.pack(side=RIGHT, expand=YES, fill=BOTH)
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74 btags = self.files.bindtags()
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75 self.files.bindtags(btags[1:] + btags[:1])
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76 self.files.bind('<ButtonRelease-1>', self.files_select_event)
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77 self.files.bind('<Double-ButtonRelease-1>', self.files_double_event)
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78 self.filesbar.config(command=(self.files, 'yview'))
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79
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80 self.dirsbar = Scrollbar(self.midframe)
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81 self.dirsbar.pack(side=LEFT, fill=Y)
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82 self.dirs = Listbox(self.midframe, exportselection=0,
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83 yscrollcommand=(self.dirsbar, 'set'))
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84 self.dirs.pack(side=LEFT, expand=YES, fill=BOTH)
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85 self.dirsbar.config(command=(self.dirs, 'yview'))
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86 btags = self.dirs.bindtags()
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87 self.dirs.bindtags(btags[1:] + btags[:1])
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88 self.dirs.bind('<ButtonRelease-1>', self.dirs_select_event)
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89 self.dirs.bind('<Double-ButtonRelease-1>', self.dirs_double_event)
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90
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91 self.ok_button = Button(self.botframe,
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92 text="OK",
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93 command=self.ok_command)
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94 self.ok_button.pack(side=LEFT)
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95 self.filter_button = Button(self.botframe,
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96 text="Filter",
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97 command=self.filter_command)
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98 self.filter_button.pack(side=LEFT, expand=YES)
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99 self.cancel_button = Button(self.botframe,
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100 text="Cancel",
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101 command=self.cancel_command)
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102 self.cancel_button.pack(side=RIGHT)
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103
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104 self.top.protocol('WM_DELETE_WINDOW', self.cancel_command)
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105 # XXX Are the following okay for a general audience?
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106 self.top.bind('<Alt-w>', self.cancel_command)
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107 self.top.bind('<Alt-W>', self.cancel_command)
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108
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109 def go(self, dir_or_file=os.curdir, pattern="*", default="", key=None):
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110 if key and dialogstates.has_key(key):
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111 self.directory, pattern = dialogstates[key]
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112 else:
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113 dir_or_file = os.path.expanduser(dir_or_file)
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114 if os.path.isdir(dir_or_file):
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115 self.directory = dir_or_file
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116 else:
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117 self.directory, default = os.path.split(dir_or_file)
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118 self.set_filter(self.directory, pattern)
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119 self.set_selection(default)
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120 self.filter_command()
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121 self.selection.focus_set()
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122 self.top.grab_set()
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123 self.how = None
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124 self.master.mainloop() # Exited by self.quit(how)
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125 if key:
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126 directory, pattern = self.get_filter()
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127 if self.how:
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128 directory = os.path.dirname(self.how)
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129 dialogstates[key] = directory, pattern
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130 self.top.destroy()
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131 return self.how
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132
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133 def quit(self, how=None):
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134 self.how = how
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135 self.master.quit() # Exit mainloop()
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136
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137 def dirs_double_event(self, event):
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138 self.filter_command()
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139
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140 def dirs_select_event(self, event):
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141 dir, pat = self.get_filter()
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142 subdir = self.dirs.get('active')
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143 dir = os.path.normpath(os.path.join(self.directory, subdir))
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144 self.set_filter(dir, pat)
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145
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146 def files_double_event(self, event):
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147 self.ok_command()
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148
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149 def files_select_event(self, event):
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150 file = self.files.get('active')
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151 self.set_selection(file)
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152
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153 def ok_event(self, event):
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154 self.ok_command()
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155
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156 def ok_command(self):
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157 self.quit(self.get_selection())
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158
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159 def filter_command(self, event=None):
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160 dir, pat = self.get_filter()
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161 try:
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162 names = os.listdir(dir)
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163 except os.error:
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164 self.master.bell()
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165 return
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166 self.directory = dir
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167 self.set_filter(dir, pat)
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168 names.sort()
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169 subdirs = [os.pardir]
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170 matchingfiles = []
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171 for name in names:
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172 fullname = os.path.join(dir, name)
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173 if os.path.isdir(fullname):
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174 subdirs.append(name)
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175 elif fnmatch.fnmatch(name, pat):
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176 matchingfiles.append(name)
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177 self.dirs.delete(0, END)
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178 for name in subdirs:
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179 self.dirs.insert(END, name)
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180 self.files.delete(0, END)
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181 for name in matchingfiles:
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182 self.files.insert(END, name)
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183 head, tail = os.path.split(self.get_selection())
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184 if tail == os.curdir: tail = ''
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185 self.set_selection(tail)
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186
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187 def get_filter(self):
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188 filter = self.filter.get()
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189 filter = os.path.expanduser(filter)
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190 if filter[-1:] == os.sep or os.path.isdir(filter):
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191 filter = os.path.join(filter, "*")
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192 return os.path.split(filter)
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193
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194 def get_selection(self):
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195 file = self.selection.get()
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196 file = os.path.expanduser(file)
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197 return file
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198
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199 def cancel_command(self, event=None):
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200 self.quit()
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201
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202 def set_filter(self, dir, pat):
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203 if not os.path.isabs(dir):
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204 try:
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205 pwd = os.getcwd()
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206 except os.error:
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207 pwd = None
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208 if pwd:
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209 dir = os.path.join(pwd, dir)
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210 dir = os.path.normpath(dir)
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211 self.filter.delete(0, END)
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212 self.filter.insert(END, os.path.join(dir or os.curdir, pat or "*"))
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213
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214 def set_selection(self, file):
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215 self.selection.delete(0, END)
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216 self.selection.insert(END, os.path.join(self.directory, file))
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217
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218
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219 class LoadFileDialog(FileDialog):
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220
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221 """File selection dialog which checks that the file exists."""
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222
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223 title = "Load File Selection Dialog"
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224
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225 def ok_command(self):
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226 file = self.get_selection()
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227 if not os.path.isfile(file):
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228 self.master.bell()
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229 else:
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230 self.quit(file)
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231
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232
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233 class SaveFileDialog(FileDialog):
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234
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235 """File selection dialog which checks that the file may be created."""
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236
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237 title = "Save File Selection Dialog"
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238
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239 def ok_command(self):
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240 file = self.get_selection()
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241 if os.path.exists(file):
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242 if os.path.isdir(file):
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243 self.master.bell()
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244 return
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245 d = Dialog(self.top,
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246 title="Overwrite Existing File Question",
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247 text="Overwrite existing file %s?" % `file`,
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248 bitmap='questhead',
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249 default=1,
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250 strings=("Yes", "Cancel"))
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251 if d.num != 0:
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252 return
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253 else:
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254 head, tail = os.path.split(file)
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255 if not os.path.isdir(head):
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256 self.master.bell()
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257 return
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258 self.quit(file)
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259
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260
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261 def test():
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262 """Simple test program."""
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263 root = Tk()
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264 root.withdraw()
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265 fd = LoadFileDialog(root)
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266 loadfile = fd.go(key="test")
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267 fd = SaveFileDialog(root)
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268 savefile = fd.go(key="test")
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269 print loadfile, savefile
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270
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271
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272 if __name__ == '__main__':
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273 test()