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annotate engine/extensions/pychan/events.py @ 220:6d09d310943b

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Pass mouseWheelMovedUp and mouseWheelMovedDown events to pychan. Fixed(?) dragging, mouse events are proceessed by the GUI if the last move was inside the gui.
author phoku@33b003aa-7bff-0310-803a-e67f0ece8222
date Thu, 19 Mar 2009 18:23:00 +0000
parents e281223a03a6
children f10a35efebc0
rev   line source
205
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1 # -*- coding: utf-8 -*-
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2 #coding: utf-8
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3
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4 """
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5 PyChan event handling
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6 =====================
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7
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8 Users shouldn't need to use this module directly.
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9 L{widgets.Widget.capture} and L{widgets.Widget.mapEvents} provide
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10 a convenient API to capture events.
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11
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12 Nevertheless to understand how its supposed to work
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13 take a look at L{EventMapper} and L{EventListener}
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14
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15 Event callbacks
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16 ---------------
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17
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18 You can either write callbacks yourself or
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19 use L{tools.callBackWithArguments} or L{tools.attrSetCallback}
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20 to generate suitable callbacks.
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21
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22 Here's an example callback::
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23 def dumpEventInfo(event=0,widget=0):
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24 print widget, " received the event ", event
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25
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26 Note the signature - C{event} and C{widget} are keyword
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27 arguments passed to the callback. If doesn't accept either
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28 C{event} or C{widget} as argument, these are not passed.
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29
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30 This way a simple function which ignores C{event} or C{widget}
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31 can be used, while they are available if needed.
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32
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33 Currently only one callback can be set per event. In case
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34 you don't want to write your own callback that dispatches
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35 to different callbacks you can use L{tools.chainCallbacks}.
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36
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37 Available Events
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38 ----------------
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39
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40 """
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41
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42 from compat import guichan
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43
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44 import exceptions
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45 from internal import get_manager
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46 import tools
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47 import traceback
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48
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49 EVENTS = [
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50 "mouseEntered",
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51 "mouseExited",
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52 "mousePressed",
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53 "mouseReleased",
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54 "mouseClicked",
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55 "mouseMoved",
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56 "mouseWheelMovedUp",
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57 "mouseWheelMovedDown",
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58 "mouseDragged",
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59 "action",
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60 "keyPressed",
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61 "keyReleased",
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62 ]
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63
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64 # Add the EVENTS to the docs.
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65 __doc__ += "".join([" - %s\n" % event for event in EVENTS])
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66
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67 # The line before seems to leak the variable event into the global namespace ... remove that!
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68 # This is a python problem, addressed in python3
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69 try: del event
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70 except:pass
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71
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72 MOUSE_EVENT, KEY_EVENT, ACTION_EVENT = range(3)
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73 def getEventType(name):
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74 if "mouse" in name:
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75 return MOUSE_EVENT
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76 if "key" in name:
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77 return KEY_EVENT
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78 return ACTION_EVENT
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79
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80
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81 CALLBACK_NONE_MESSAGE = """\
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82 You passed None as parameter to %s.capture, which would normally remove a mapped event.
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83 But there was no event mapped. Did you accidently call a function instead of passing it?
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84 """
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85 class EventListenerBase(object):
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86 """
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87 Redirector for event callbacks.
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88 Use *only* from L{EventMapper}.
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89
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90 This class uses the SWIG director feature - overriden
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91 virtual methods are called from C++ to - listen to
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92 Guichan events.
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93
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94 """
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95 def __init__(self):
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96 super(EventListenerBase,self).__init__()
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97 self.events = {}
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98 self.indent = 0
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99 self.debug = get_manager().debug
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100 self.is_attached = False
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101
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102 def attach(self,widget):
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103 """
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104 Start receiving events.
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105 No need to call this manually.
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106 """
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107
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108 if self.is_attached:
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109 return
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110 if not self.events:
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111 return
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112 if self.debug: print "Attach:",self
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113 self.doAttach(widget.real_widget)
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114 self.widget = widget
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115 self.is_attached = True
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116
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117 def detach(self):
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118 """
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119 Stop receiving events.
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120 No need to call this manually.
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121 """
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122 if not self.is_attached:
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123 return
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124 if self.debug: print "Detach:",self
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125 self.doDetach(self.widget.real_widget)
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126 self.widget = None
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127 self.is_attached = False
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128
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129 def _redirectEvent(self,name,event):
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130 self.indent += 4
205
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131 try:
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132 event = self.translateEvent(getEventType(name), event)
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133 if name in self.events:
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134 if self.debug: print "-"*self.indent, name
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135 for f in self.events[name].itervalues():
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136 f( event )
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137
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138 except:
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139 print name, event
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140 traceback.print_exc()
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141 raise
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142
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143 finally:
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144 self.indent -= 4
157
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145
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146 def translateEvent(self,event_type,event):
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147 if event_type == MOUSE_EVENT:
205
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148 return get_manager().hook.translate_mouse_event(event)
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149 if event_type == KEY_EVENT:
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150 return get_manager().hook.translate_key_event(event)
157
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151 return event
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152
205
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153 class _ActionEventListener(EventListenerBase,guichan.ActionListener):
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154 def __init__(self):super(_ActionEventListener,self).__init__()
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155 def doAttach(self,real_widget): real_widget.addActionListener(self)
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156 def doDetach(self,real_widget): real_widget.removeActionListener(self)
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157
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158 def action(self,e): self._redirectEvent("action",e)
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159
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160 class _MouseEventListener(EventListenerBase,guichan.MouseListener):
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161 def __init__(self):super(_MouseEventListener,self).__init__()
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162 def doAttach(self,real_widget): real_widget.addMouseListener(self)
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163 def doDetach(self,real_widget): real_widget.removeMouseListener(self)
157
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164
205
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165 def mouseEntered(self,e): self._redirectEvent("mouseEntered",e)
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166 def mouseExited(self,e): self._redirectEvent("mouseExited",e)
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167 def mousePressed(self,e): self._redirectEvent("mousePressed",e)
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168 def mouseReleased(self,e): self._redirectEvent("mouseReleased",e)
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169 def mouseClicked(self,e): self._redirectEvent("mouseClicked",e)
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170 def mouseMoved(self,e): self._redirectEvent("mouseMoved",e)
220
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171 def mouseWheelMovedUp(self,e): self._redirectEvent("mouseWheelMovedUp",e)
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172 def mouseWheelMovedDown(self,e): self._redirectEvent("mouseWheelMovedDown",e)
205
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173 def mouseDragged(self,e): self._redirectEvent("mouseDragged",e)
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174
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175 class _KeyEventListener(EventListenerBase,guichan.KeyListener):
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176 def __init__(self):super(_KeyEventListener,self).__init__()
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177 def doAttach(self,real_widget): real_widget.addKeyListener(self)
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178 def doDetach(self,real_widget): real_widget.removeKeyListener(self)
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179
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180 def keyPressed(self,e): self._redirectEvent("keyPressed",e)
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181 def keyReleased(self,e): self._redirectEvent("keyReleased",e)
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182
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183 class EventMapper(object):
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184 """
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185 Handles events and callbacks for L{widgets.Widget}
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186 and derived classes.
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187
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188 Every PyChan widget has an L{EventMapper} instance
205
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189 as attribute B{event_mapper}.
157
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190
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191 This instance handles all necessary house-keeping.
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192 Such an event mapper can be either *attached* or
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193 *detached*. In its attached state an L{EventListener}
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194 is added to the Guichan widget and will redirect
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195 the events to the callbacks.
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196
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197 In its detached state no events are received from the
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198 real Guichan widget.
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199
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200 The event mapper starts in the detached state.
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201 When a new event is captured the mapper attaches itself
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202 automatically. The widget doesn't need to handle that.
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203 """
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204 def __init__(self,widget):
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205 super(EventMapper,self).__init__()
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206 self.widget = widget
205
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207 self.listener = {
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208 KEY_EVENT : _KeyEventListener(),
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209 ACTION_EVENT : _ActionEventListener(),
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210 MOUSE_EVENT : _MouseEventListener(),
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211 }
157
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212 self.is_attached = False
205
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213 self.debug = get_manager().debug
157
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214
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215 def __repr__(self):
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216 return "EventMapper(%s)" % repr(self.widget)
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217
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218
164
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219 def capture(self,event_name,callback,group_name):
157
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220 if event_name not in EVENTS:
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221 raise exceptions.RuntimeError("Unknown eventname: " + event_name)
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222
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223 if callback is None:
166
81a222e7bd25 Fixes for event handling.
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224 if self.isCaptured(event_name,group_name):
205
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225 self.removeEvent(event_name,group_name)
164
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226 elif self.debug:
188
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diff changeset
227 print CALLBACK_NONE_MESSAGE % str(self.widget)
157
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228 return
205
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229 self.addEvent(event_name,callback,group_name)
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230
205
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231 def isCaptured(self,event_name,group_name="default"):
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232 return ("%s/%s" % (event_name,group_name)) in self.getCapturedEvents()
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233
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234 def getCapturedEvents(self):
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235 events = []
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236 for event_type, listener in self.listener.items():
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237 for event_name, group in listener.events.items():
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238 for group_name in group.keys():
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239 events.append( "%s/%s" % (event_name, group_name) )
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240 return events
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241
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242 def getListener(self,event_name):
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243 return self.listener[getEventType(event_name)]
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244
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245 def removeEvent(self,event_name,group_name):
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246 listener = self.getListener(event_name)
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247 del listener.events[event_name][group_name]
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248 if not listener.events[event_name]:
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249 del listener.events[event_name]
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250 if not listener.events:
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251 listener.detach()
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252
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253 def addEvent(self,event_name,callback,group_name):
157
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254 if not callable(callback):
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255 raise RuntimeError("An event callback must be either a callable or None - not %s" % repr(callback))
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256
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257 def captured_f(event):
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258 tools.applyOnlySuitable(callback,event=event,widget=self.widget)
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259
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260 listener = self.getListener(event_name)
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261
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262 if event_name not in listener.events:
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263 listener.events[event_name] = {group_name : captured_f}
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264 else:
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265 listener.events[event_name][group_name] = captured_f
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266 listener.attach(self.widget)
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267
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268
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269 def splitEventDescriptor(name):
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270 """ Utility function to split "widgetName/eventName" descriptions into tuples. """
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271 L = name.split("/")
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272 if len(L) not in (1,2,3):
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273 raise exceptions.RuntimeError("Invalid widgetname / eventname combination: " + name)
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274 if len(L) == 1:
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275 L = L[0],"action"
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276 elif L[1] not in EVENTS:
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277 raise exceptions.RuntimeError("Unknown event name: " + name)
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278 if len(L) == 2:
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279 L = L[0],L[1],"default"
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280 return L
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281
205
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282