Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-stdwin/mainloop.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 560ec7030817
children
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1 # Standard main loop for *all* STDWIN applications.
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2 # This requires that applications:
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3 # - register their windows on creation and unregister them when closed
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4 # - have a 'dispatch' function as a window member
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5
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6
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7 import stdwin, stdwinq
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8 from stdwinevents import *
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9
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10
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11 # List of windows known to the main loop.
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12 #
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13 windows = []
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14
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15
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16 # Last window that ever received an event
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17 #
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18 last_window = None
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19
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20
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21 # Function to register a window.
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22 #
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23 def register(win):
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24 # First test the dispatch function by passing it a null event --
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25 # this catches registration of unconforming windows.
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26 win.dispatch((WE_NULL, win, None))
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27 if win not in windows:
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28 windows.append(win)
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29
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30
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31 # Function to unregister a window.
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32 # It is not an error to unregister an already unregistered window
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33 # (this is useful for cleanup actions).
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34 #
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35 def unregister(win):
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36 global last_window
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37 if win == last_window:
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38 last_window = None
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39 if win in windows:
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40 windows.remove(win) # Not in 0.9.1
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41 # 0.9.1 solution:
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42 #for i in range(len(windows)):
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43 # if windows[i] = win:
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44 # del windows[i]
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45 # break
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46
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47
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48 # Interfaces used by WindowSched.
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49 #
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50 def countwindows():
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51 return len(windows)
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52 #
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53 def anywindow():
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54 if windows:
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55 return windows[0]
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56 else:
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57 return None
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58
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59
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60 # NEW: register any number of file descriptors
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61 #
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62 fdlist = []
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63 select_args = None
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64 select_handlers = None
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65 #
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66 def registerfd(fd, mode, handler):
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67 if mode not in ('r', 'w', 'x'):
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68 raise ValueError, 'mode must be r, w or x'
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69 if type(fd) <> type(0):
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70 fd = fd.fileno() # If this fails it's not a proper select arg
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71 for i in range(len(fdlist)):
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72 if fdlist[i][:2] == (fd, mode):
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73 raise ValueError, \
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74 '(fd, mode) combination already registered'
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75 fdlist.append((fd, mode, handler))
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76 make_select_args()
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77 #
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78 def unregisterfd(fd, *args):
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79 if type(fd) <> type(0):
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80 fd = fd.fileno() # If this fails it's not a proper select arg
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81 args = (fd,) + args
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82 n = len(args)
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83 for i in range(len(fdlist)):
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84 if fdlist[i][:n] == args:
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85 del fdlist[i]
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86 make_select_args()
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87 #
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88 def make_select_args():
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89 global select_args, select_handlers
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90 rlist, wlist, xlist = [], [], []
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91 rhandlers, whandlers, xhandlers = {}, {}, {}
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92 for fd, mode, handler in fdlist:
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93 if mode == 'r':
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94 rlist.append(fd)
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95 rhandlers[`fd`] = handler
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96 if mode == 'w':
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97 wlist.append(fd)
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98 whandlers[`fd`] = handler
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99 if mode == 'x':
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100 xlist.append(fd)
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101 xhandlers[`fd`] = handler
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102 if rlist or wlist or xlist:
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103 select_args = rlist, wlist, xlist
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104 select_handlers = rhandlers, whandlers, xhandlers
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105 else:
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106 select_args = None
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107 select_handlers = None
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108 #
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109 def do_select():
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110 import select
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111 reply = apply(select.select, select_args)
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112 for mode in 0, 1, 2:
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113 list = reply[mode]
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114 for fd in list:
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115 handler = select_handlers[mode][`fd`]
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116 handler(fd, 'rwx'[mode])
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117
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118
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119 # Event processing main loop.
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120 # Return when there are no windows left, or when an unhandled
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121 # exception occurs. (It is safe to restart the main loop after
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122 # an unsuccessful exit.)
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123 # Python's stdwin.getevent() turns WE_COMMAND/WC_CANCEL events
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124 # into KeyboardInterrupt exceptions; these are turned back in events.
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125 #
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126 recursion_level = 0 # Hack to make it reentrant
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127 def mainloop():
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128 global recursion_level
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129 recursion_level = recursion_level + 1
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130 try:
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131 stdwin_select_handler() # Process events already in queue
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132 while 1:
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133 if windows and not fdlist:
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134 while windows and not fdlist:
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135 try:
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136 event = stdwinq.getevent()
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137 except KeyboardInterrupt:
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138 event = (WE_COMMAND, \
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139 None, WC_CANCEL)
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140 dispatch(event)
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141 elif windows and fdlist:
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142 fd = stdwin.fileno()
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143 if recursion_level == 1:
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144 registerfd(fd, 'r', stdwin_select_handler)
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145 try:
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146 while windows:
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147 do_select()
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148 stdwin_select_handler()
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149 finally:
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150 if recursion_level == 1:
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151 unregisterfd(fd)
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152 elif fdlist:
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153 while fdlist and not windows:
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154 do_select()
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155 else:
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156 break
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157 finally:
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158 recursion_level = recursion_level - 1
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159
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160
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161 # Check for events without ever blocking
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162 #
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163 def check():
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164 stdwin_select_handler()
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165 # XXX Should check for socket stuff as well
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166
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167
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168 # Handle stdwin events until none are left
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169 #
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170 def stdwin_select_handler(*args):
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171 while 1:
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172 try:
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173 event = stdwinq.pollevent()
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174 except KeyboardInterrupt:
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175 event = (WE_COMMAND, None, WC_CANCEL)
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176 if event is None:
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177 break
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178 dispatch(event)
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179
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180
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181 # Run a modal dialog loop for a window. The dialog window must have
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182 # been registered first. This prohibits most events (except size/draw
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183 # events) to other windows. The modal dialog loop ends when the
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184 # dialog window unregisters itself.
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185 #
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186 passthrough = WE_SIZE, WE_DRAW
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187 beeping = WE_MOUSE_DOWN, WE_COMMAND, WE_CHAR, WE_KEY, WE_CLOSE, WE_MENU
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188 #
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189 def modaldialog(window):
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190 if window not in windows:
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191 raise ValueError, 'modaldialog window not registered'
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192 while window in windows:
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193 try:
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194 event = stdwinq.getevent()
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195 except KeyboardInterrupt:
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196 event = WE_COMMAND, None, WC_CANCEL
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197 etype, ewindow, edetail = event
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198 if etype not in passthrough and ewindow <> window:
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199 if etype in beeping:
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200 stdwin.fleep()
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201 continue
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202 dispatch(event)
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203
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204
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205 # Dispatch a single event.
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206 # Events for the no window in particular are sent to the active window
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207 # or to the last window that received an event (these hacks are for the
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208 # WE_LOST_SEL event, which is directed to no particular window).
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209 # Windows not in the windows list don't get their events:
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210 # events for such windows are silently ignored.
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211 #
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212 def dispatch(event):
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213 global last_window
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214 if event[1] == None:
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215 active = stdwin.getactive()
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216 if active: last_window = active
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217 else:
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218 last_window = event[1]
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219 if last_window in windows:
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220 last_window.dispatch(event)
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221
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222
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223 # Dialog base class
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224 #
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225 class Dialog:
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226 #
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227 def __init__(self, title):
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228 self.window = stdwin.open(title)
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229 self.window.dispatch = self.dispatch
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230 register(self.window)
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231 #
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232 def close(self):
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233 unregister(self.window)
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234 del self.window.dispatch
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235 self.window.close()
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236 #
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237 def dispatch(self, event):
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238 etype, ewindow, edetail = event
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239 if etype == WE_CLOSE:
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240 self.close()
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241
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242
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243 # Standard modal dialogs
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244 # XXX implemented using stdwin dialogs for now
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245 #
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246 def askstr(prompt, default):
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247 return stdwin.askstr(prompt, default)
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248 #
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249 def askync(prompt, yesorno):
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250 return stdwin.askync(prompt, yesorno)
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251 #
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252 def askfile(prompt, default, new):
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253 return stdwin.askfile(prompt, default, new)
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254 #
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255 def message(msg):
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256 stdwin.message(msg)