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annotate Lib/tkinter/simpledialog.py @ 70817:dd775b1561ba

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author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 6dbb2c1c0900
children fd5166fdb978
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8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
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1 #
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2 # An Introduction to Tkinter
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3 #
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4 # Copyright (c) 1997 by Fredrik Lundh
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5 #
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6 # This copyright applies to Dialog, askinteger, askfloat and asktring
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7 #
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8 # fredrik@pythonware.com
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9 # http://www.pythonware.com
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10 #
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11 """This modules handles dialog boxes.
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12
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13 It contains the following public symbols:
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14
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15 SimpleDialog -- A simple but flexible modal dialog box
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16
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17 Dialog -- a base class for dialogs
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18
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19 askinteger -- get an integer from the user
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20
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21 askfloat -- get a float from the user
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22
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23 askstring -- get a string from the user
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24 """
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25
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26 from tkinter import *
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27 from tkinter import messagebox
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28
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29 import tkinter # used at _QueryDialog for tkinter._default_root
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30
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31 class SimpleDialog:
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32
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33 def __init__(self, master,
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34 text='', buttons=[], default=None, cancel=None,
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35 title=None, class_=None):
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36 if class_:
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37 self.root = Toplevel(master, class_=class_)
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38 else:
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39 self.root = Toplevel(master)
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40 if title:
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41 self.root.title(title)
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42 self.root.iconname(title)
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43 self.message = Message(self.root, text=text, aspect=400)
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44 self.message.pack(expand=1, fill=BOTH)
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45 self.frame = Frame(self.root)
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46 self.frame.pack()
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47 self.num = default
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48 self.cancel = cancel
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49 self.default = default
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50 self.root.bind('<Return>', self.return_event)
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51 for num in range(len(buttons)):
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52 s = buttons[num]
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53 b = Button(self.frame, text=s,
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54 command=(lambda self=self, num=num: self.done(num)))
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55 if num == default:
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56 b.config(relief=RIDGE, borderwidth=8)
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57 b.pack(side=LEFT, fill=BOTH, expand=1)
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58 self.root.protocol('WM_DELETE_WINDOW', self.wm_delete_window)
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59 self._set_transient(master)
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60
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61 def _set_transient(self, master, relx=0.5, rely=0.3):
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62 widget = self.root
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63 widget.withdraw() # Remain invisible while we figure out the geometry
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64 widget.transient(master)
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65 widget.update_idletasks() # Actualize geometry information
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66 if master.winfo_ismapped():
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67 m_width = master.winfo_width()
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68 m_height = master.winfo_height()
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69 m_x = master.winfo_rootx()
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70 m_y = master.winfo_rooty()
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71 else:
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72 m_width = master.winfo_screenwidth()
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73 m_height = master.winfo_screenheight()
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74 m_x = m_y = 0
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75 w_width = widget.winfo_reqwidth()
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76 w_height = widget.winfo_reqheight()
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77 x = m_x + (m_width - w_width) * relx
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78 y = m_y + (m_height - w_height) * rely
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79 if x+w_width > master.winfo_screenwidth():
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80 x = master.winfo_screenwidth() - w_width
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81 elif x < 0:
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82 x = 0
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83 if y+w_height > master.winfo_screenheight():
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84 y = master.winfo_screenheight() - w_height
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85 elif y < 0:
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86 y = 0
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87 widget.geometry("+%d+%d" % (x, y))
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88 widget.deiconify() # Become visible at the desired location
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89
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90 def go(self):
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91 self.root.wait_visibility()
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92 self.root.grab_set()
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93 self.root.mainloop()
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94 self.root.destroy()
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95 return self.num
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96
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97 def return_event(self, event):
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98 if self.default is None:
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99 self.root.bell()
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100 else:
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101 self.done(self.default)
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102
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103 def wm_delete_window(self):
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104 if self.cancel is None:
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105 self.root.bell()
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106 else:
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107 self.done(self.cancel)
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108
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109 def done(self, num):
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110 self.num = num
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111 self.root.quit()
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112
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113
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114 class Dialog(Toplevel):
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115
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116 '''Class to open dialogs.
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117
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118 This class is intended as a base class for custom dialogs
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119 '''
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120
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121 def __init__(self, parent, title = None):
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122
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123 '''Initialize a dialog.
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124
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125 Arguments:
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126
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127 parent -- a parent window (the application window)
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128
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129 title -- the dialog title
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130 '''
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131 Toplevel.__init__(self, parent)
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132
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133 self.withdraw() # remain invisible for now
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134 # If the master is not viewable, don't
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135 # make the child transient, or else it
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136 # would be opened withdrawn
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137 if parent.winfo_viewable():
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138 self.transient(parent)
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139
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140 if title:
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141 self.title(title)
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142
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143 self.parent = parent
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144
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145 self.result = None
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146
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147 body = Frame(self)
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148 self.initial_focus = self.body(body)
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149 body.pack(padx=5, pady=5)
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150
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151 self.buttonbox()
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152
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153 if not self.initial_focus:
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154 self.initial_focus = self
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155
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156 self.protocol("WM_DELETE_WINDOW", self.cancel)
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157
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158 if self.parent is not None:
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159 self.geometry("+%d+%d" % (parent.winfo_rootx()+50,
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160 parent.winfo_rooty()+50))
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161
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162 self.deiconify() # become visible now
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163
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164 self.initial_focus.focus_set()
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165
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166 # wait for window to appear on screen before calling grab_set
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167 self.wait_visibility()
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168 self.grab_set()
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169 self.wait_window(self)
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170
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171 def destroy(self):
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172 '''Destroy the window'''
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173 self.initial_focus = None
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174 Toplevel.destroy(self)
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175
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176 #
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177 # construction hooks
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178
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179 def body(self, master):
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180 '''create dialog body.
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181
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182 return widget that should have initial focus.
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183 This method should be overridden, and is called
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184 by the __init__ method.
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185 '''
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186 pass
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187
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188 def buttonbox(self):
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189 '''add standard button box.
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190
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191 override if you do not want the standard buttons
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192 '''
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193
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194 box = Frame(self)
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195
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196 w = Button(box, text="OK", width=10, command=self.ok, default=ACTIVE)
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197 w.pack(side=LEFT, padx=5, pady=5)
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198 w = Button(box, text="Cancel", width=10, command=self.cancel)
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199 w.pack(side=LEFT, padx=5, pady=5)
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200
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201 self.bind("<Return>", self.ok)
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202 self.bind("<Escape>", self.cancel)
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203
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204 box.pack()
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205
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206 #
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207 # standard button semantics
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208
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209 def ok(self, event=None):
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210
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211 if not self.validate():
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212 self.initial_focus.focus_set() # put focus back
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213 return
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214
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215 self.withdraw()
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216 self.update_idletasks()
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217
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218 try:
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219 self.apply()
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220 finally:
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221 self.cancel()
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222
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223 def cancel(self, event=None):
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224
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225 # put focus back to the parent window
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226 if self.parent is not None:
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227 self.parent.focus_set()
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228 self.destroy()
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229
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230 #
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231 # command hooks
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232
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233 def validate(self):
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234 '''validate the data
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235
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236 This method is called automatically to validate the data before the
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237 dialog is destroyed. By default, it always validates OK.
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238 '''
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239
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240 return 1 # override
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241
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242 def apply(self):
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243 '''process the data
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244
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245 This method is called automatically to process the data, *after*
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246 the dialog is destroyed. By default, it does nothing.
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247 '''
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248
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249 pass # override
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250
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251
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252 # --------------------------------------------------------------------
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253 # convenience dialogues
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254
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255 class _QueryDialog(Dialog):
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256
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257 def __init__(self, title, prompt,
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258 initialvalue=None,
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259 minvalue = None, maxvalue = None,
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260 parent = None):
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261
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262 if not parent:
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263 parent = tkinter._default_root
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264
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265 self.prompt = prompt
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266 self.minvalue = minvalue
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267 self.maxvalue = maxvalue
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268
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269 self.initialvalue = initialvalue
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270
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271 Dialog.__init__(self, parent, title)
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272
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273 def destroy(self):
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274 self.entry = None
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275 Dialog.destroy(self)
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276
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277 def body(self, master):
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278
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279 w = Label(master, text=self.prompt, justify=LEFT)
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280 w.grid(row=0, padx=5, sticky=W)
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281
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282 self.entry = Entry(master, name="entry")
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283 self.entry.grid(row=1, padx=5, sticky=W+E)
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284
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285 if self.initialvalue:
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286 self.entry.insert(0, self.initialvalue)
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287 self.entry.select_range(0, END)
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288
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289 return self.entry
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290
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291 def validate(self):
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292 try:
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293 result = self.getresult()
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294 except ValueError:
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295 messagebox.showwarning(
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296 "Illegal value",
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297 self.errormessage + "\nPlease try again",
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298 parent = self
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299 )
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300 return 0
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301
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302 if self.minvalue is not None and result < self.minvalue:
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303 messagebox.showwarning(
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304 "Too small",
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305 "The allowed minimum value is %s. "
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306 "Please try again." % self.minvalue,
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307 parent = self
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308 )
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309 return 0
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310
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diff changeset
311 if self.maxvalue is not None and result > self.maxvalue:
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312 messagebox.showwarning(
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313 "Too large",
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314 "The allowed maximum value is %s. "
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315 "Please try again." % self.maxvalue,
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316 parent = self
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317 )
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318 return 0
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319
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320 self.result = result
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321
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322 return 1
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323
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324
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325 class _QueryInteger(_QueryDialog):
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326 errormessage = "Not an integer."
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327 def getresult(self):
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328 return int(self.entry.get())
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329
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330 def askinteger(title, prompt, **kw):
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331 '''get an integer from the user
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332
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333 Arguments:
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334
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335 title -- the dialog title
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336 prompt -- the label text
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337 **kw -- see SimpleDialog class
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338
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339 Return value is an integer
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340 '''
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341 d = _QueryInteger(title, prompt, **kw)
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342 return d.result
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343
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344 class _QueryFloat(_QueryDialog):
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345 errormessage = "Not a floating point value."
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346 def getresult(self):
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347 return float(self.entry.get())
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348
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349 def askfloat(title, prompt, **kw):
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350 '''get a float from the user
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351
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352 Arguments:
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353
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354 title -- the dialog title
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355 prompt -- the label text
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356 **kw -- see SimpleDialog class
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357
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358 Return value is a float
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359 '''
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360 d = _QueryFloat(title, prompt, **kw)
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361 return d.result
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362
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
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363 class _QueryString(_QueryDialog):
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364 def __init__(self, *args, **kw):
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Georg Brandl <georg@python.org>
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diff changeset
365 if "show" in kw:
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366 self.__show = kw["show"]
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Georg Brandl <georg@python.org>
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367 del kw["show"]
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diff changeset
368 else:
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369 self.__show = None
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370 _QueryDialog.__init__(self, *args, **kw)
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diff changeset
371
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diff changeset
372 def body(self, master):
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diff changeset
373 entry = _QueryDialog.body(self, master)
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diff changeset
374 if self.__show is not None:
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Georg Brandl <georg@python.org>
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diff changeset
375 entry.configure(show=self.__show)
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Georg Brandl <georg@python.org>
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diff changeset
376 return entry
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diff changeset
377
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diff changeset
378 def getresult(self):
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Georg Brandl <georg@python.org>
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diff changeset
379 return self.entry.get()
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Georg Brandl <georg@python.org>
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diff changeset
380
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diff changeset
381 def askstring(title, prompt, **kw):
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Georg Brandl <georg@python.org>
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diff changeset
382 '''get a string from the user
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
parents: 47130
diff changeset
383
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
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diff changeset
384 Arguments:
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Georg Brandl <georg@python.org>
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diff changeset
385
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diff changeset
386 title -- the dialog title
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Georg Brandl <georg@python.org>
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diff changeset
387 prompt -- the label text
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
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diff changeset
388 **kw -- see SimpleDialog class
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Georg Brandl <georg@python.org>
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diff changeset
389
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Georg Brandl <georg@python.org>
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diff changeset
390 Return value is a string
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Georg Brandl <georg@python.org>
parents: 47130
diff changeset
391 '''
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
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diff changeset
392 d = _QueryString(title, prompt, **kw)
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Georg Brandl <georg@python.org>
parents: 47130
diff changeset
393 return d.result
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
parents: 47130
diff changeset
394
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
parents: 47130
diff changeset
395
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Georg Brandl <georg@python.org>
parents: 47130
diff changeset
396
31776
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
397 if __name__ == '__main__':
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
398
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
399 def test():
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
400 root = Tk()
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
401 def doit(root=root):
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
402 d = SimpleDialog(root,
7731
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
403 text="This is a test dialog. "
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
404 "Would this have been an actual dialog, "
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
405 "the buttons below would have been glowing "
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
406 "in soft pink light.\n"
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
407 "Do you believe this?",
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
408 buttons=["Yes", "No", "Cancel"],
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
409 default=0,
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
410 cancel=2,
9c37ed8868b9 Give in to the tab police.
Guido van Rossum <guido@python.org>
parents: 6948
diff changeset
411 title="Test Dialog")
40775
4cdf21a0dbbc Fix most trivially-findable print statements.
Guido van Rossum <guido@python.org>
parents: 32940
diff changeset
412 print(d.go())
47132
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
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diff changeset
413 print(askinteger("Spam", "Egg count", initialvalue=12*12))
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Georg Brandl <georg@python.org>
parents: 47130
diff changeset
414 print(askfloat("Spam", "Egg weight\n(in tons)", minvalue=1,
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
parents: 47130
diff changeset
415 maxvalue=100))
8a74612f3d2b Tkinter, step 4: merge simple- and filedialog modules.
Georg Brandl <georg@python.org>
parents: 47130
diff changeset
416 print(askstring("Spam", "Egg label"))
31776
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
417 t = Button(root, text='Test', command=doit)
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
418 t.pack()
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
419 q = Button(root, text='Quit', command=t.quit)
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
420 q.pack()
29be729b32c3 Patch #911176: Move test function into __main__
Martin v. Löwis <martin@v.loewis.de>
parents: 7731
diff changeset
421 t.mainloop()
3688
a79b8d81997f new simple dialog module, incompatible
Guido van Rossum <guido@python.org>
parents:
diff changeset
422
a79b8d81997f new simple dialog module, incompatible
Guido van Rossum <guido@python.org>
parents:
diff changeset
423 test()