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annotate engine/extensions/pychan/events.py @ 232:f10a35efebc0

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Memory leak fix for pychan Thanks to phoku for doing much of this patch
author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Mon, 23 Mar 2009 02:06:14 +0000
parents 6d09d310943b
children e4dfdf4c11fd
rev   line source
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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 import weakref
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49
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50 EVENTS = [
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51 "mouseEntered",
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52 "mouseExited",
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53 "mousePressed",
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54 "mouseReleased",
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55 "mouseClicked",
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56 "mouseMoved",
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57 "mouseWheelMovedUp",
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58 "mouseWheelMovedDown",
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59 "mouseDragged",
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60 "action",
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61 "keyPressed",
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62 "keyReleased",
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63 ]
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64
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65 # Add the EVENTS to the docs.
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66 __doc__ += "".join([" - %s\n" % event for event in EVENTS])
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67
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68 # The line before seems to leak the variable event into the global namespace ... remove that!
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69 # This is a python problem, addressed in python3
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70 try: del event
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71 except:pass
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72
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73 MOUSE_EVENT, KEY_EVENT, ACTION_EVENT = range(3)
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74 def getEventType(name):
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75 if "mouse" in name:
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76 return MOUSE_EVENT
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77 if "key" in name:
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78 return KEY_EVENT
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79 return ACTION_EVENT
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80
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81
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82 CALLBACK_NONE_MESSAGE = """\
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83 You passed None as parameter to %s.capture, which would normally remove a mapped event.
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84 But there was no event mapped. Did you accidently call a function instead of passing it?
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85 """
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86 class EventListenerBase(object):
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87 """
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88 Redirector for event callbacks.
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89 Use *only* from L{EventMapper}.
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90
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91 This class uses the SWIG director feature - overriden
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92 virtual methods are called from C++ to - listen to
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93 Guichan events.
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94
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95 """
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96 def __init__(self):
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97 super(EventListenerBase,self).__init__()
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98 self.events = {}
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99 self.indent = 0
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100 self.debug = get_manager().debug
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101 self.is_attached = False
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102
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103 def attach(self,widget):
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104 """
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105 Start receiving events.
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106 No need to call this manually.
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107 """
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108
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109 if self.is_attached:
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110 return
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111 if not self.events:
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112 return
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113 if self.debug: print "Attach:",self
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114 self.doAttach(widget.real_widget)
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115 self.widget_ref = weakref.ref(widget)
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116 self.is_attached = True
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117
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118 def detach(self):
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119 """
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120 Stop receiving events.
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121 No need to call this manually.
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122 """
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123 if not self.is_attached:
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124 return
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125 if self.debug: print "Detach:",self
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126 self.is_attached = False
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127
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128 def _redirectEvent(self,name,event):
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129 self.indent += 4
205
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130 try:
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131 event = self.translateEvent(getEventType(name), event)
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132 if name in self.events:
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133 if self.debug: print "-"*self.indent, name
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134 for f in self.events[name].itervalues():
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135 f( event )
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136
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137 except:
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138 print name, event
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139 traceback.print_exc()
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140 raise
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141
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142 finally:
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143 self.indent -= 4
157
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144
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145 def translateEvent(self,event_type,event):
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146 if event_type == MOUSE_EVENT:
205
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147 return get_manager().hook.translate_mouse_event(event)
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148 if event_type == KEY_EVENT:
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149 return get_manager().hook.translate_key_event(event)
157
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150 return event
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151
205
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152 class _ActionEventListener(EventListenerBase,guichan.ActionListener):
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153 def __init__(self):super(_ActionEventListener,self).__init__()
232
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154 def doAttach(self,real_widget): real_widget.addActionListener(self)
205
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155 def doDetach(self,real_widget): real_widget.removeActionListener(self)
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156
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157 def action(self,e): self._redirectEvent("action",e)
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158
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159 class _MouseEventListener(EventListenerBase,guichan.MouseListener):
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160 def __init__(self):super(_MouseEventListener,self).__init__()
232
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161 def doAttach(self,real_widget): real_widget.addMouseListener(self)
205
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162 def doDetach(self,real_widget): real_widget.removeMouseListener(self)
157
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163
205
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164 def mouseEntered(self,e): self._redirectEvent("mouseEntered",e)
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165 def mouseExited(self,e): self._redirectEvent("mouseExited",e)
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166 def mousePressed(self,e): self._redirectEvent("mousePressed",e)
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167 def mouseReleased(self,e): self._redirectEvent("mouseReleased",e)
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168 def mouseClicked(self,e): self._redirectEvent("mouseClicked",e)
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169 def mouseMoved(self,e): self._redirectEvent("mouseMoved",e)
220
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170 def mouseWheelMovedUp(self,e): self._redirectEvent("mouseWheelMovedUp",e)
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171 def mouseWheelMovedDown(self,e): self._redirectEvent("mouseWheelMovedDown",e)
205
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172 def mouseDragged(self,e): self._redirectEvent("mouseDragged",e)
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173
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174 class _KeyEventListener(EventListenerBase,guichan.KeyListener):
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175 def __init__(self):super(_KeyEventListener,self).__init__()
232
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176 def doAttach(self,real_widget): real_widget.addKeyListener(self)
205
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177 def doDetach(self,real_widget): real_widget.removeKeyListener(self)
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178
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179 def keyPressed(self,e): self._redirectEvent("keyPressed",e)
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180 def keyReleased(self,e): self._redirectEvent("keyReleased",e)
157
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181
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182 class EventMapper(object):
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183 """
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184 Handles events and callbacks for L{widgets.Widget}
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185 and derived classes.
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186
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187 Every PyChan widget has an L{EventMapper} instance
205
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188 as attribute B{event_mapper}.
157
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189
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190 This instance handles all necessary house-keeping.
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191 Such an event mapper can be either *attached* or
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192 *detached*. In its attached state an L{EventListener}
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193 is added to the Guichan widget and will redirect
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194 the events to the callbacks.
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195
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196 In its detached state no events are received from the
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197 real Guichan widget.
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198
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199 The event mapper starts in the detached state.
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200 When a new event is captured the mapper attaches itself
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201 automatically. The widget doesn't need to handle that.
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202 """
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203 def __init__(self,widget):
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204 super(EventMapper,self).__init__()
232
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205 self.widget_ref = weakref.ref(widget)
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206 self.callbacks = {}
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):
232
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216 return "EventMapper(%s)" % repr(self.widget_ref())
157
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217
232
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218 def attach(self):
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219 for listener in self.listener.values():
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220 listener.attach()
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221
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222 def detach(self):
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223 for listener in self.listener.values():
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224 listener.detach()
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225
157
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226
164
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227 def capture(self,event_name,callback,group_name):
157
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228 if event_name not in EVENTS:
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229 raise exceptions.RuntimeError("Unknown eventname: " + event_name)
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230
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231 if callback is None:
166
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232 if self.isCaptured(event_name,group_name):
205
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233 self.removeEvent(event_name,group_name)
164
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234 elif self.debug:
232
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235 print CALLBACK_NONE_MESSAGE % str(self.widget_ref())
157
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236 return
205
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237 self.addEvent(event_name,callback,group_name)
157
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238
205
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239 def isCaptured(self,event_name,group_name="default"):
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240 return ("%s/%s" % (event_name,group_name)) in self.getCapturedEvents()
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241
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242 def getCapturedEvents(self):
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243 events = []
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244 for event_type, listener in self.listener.items():
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245 for event_name, group in listener.events.items():
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246 for group_name in group.keys():
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247 events.append( "%s/%s" % (event_name, group_name) )
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248 return events
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249
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250 def getListener(self,event_name):
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251 return self.listener[getEventType(event_name)]
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252
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253 def removeEvent(self,event_name,group_name):
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254 listener = self.getListener(event_name)
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255 del listener.events[event_name][group_name]
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256
205
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257 if not listener.events[event_name]:
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258 del listener.events[event_name]
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259 if not listener.events:
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260 listener.detach()
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261
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262 del self.callbacks[group_name][event_name]
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263 if len(self.callbacks[group_name]) <= 0:
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264 del self.callbacks[group_name]
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265
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266 def addEvent(self,event_name,callback,group_name):
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267 if not callable(callback):
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268 raise RuntimeError("An event callback must be either a callable or None - not %s" % repr(callback))
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269 # The closure self needs to keep a weak ref.
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270 # Otherwise the GC has problems.
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271 self_ref = weakref.ref(self)
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272
232
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273 # Set up callback dictionary. This should fix some GC issues
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274 if not self.callbacks.has_key(group_name):
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275 self.callbacks[group_name] = {}
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276
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277 if not self.callbacks[group_name].has_key(event_name):
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278 self.callbacks[group_name][event_name] = {}
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279
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280 self.callbacks[group_name][event_name] = callback
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281
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282
157
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283 def captured_f(event):
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284 tools.applyOnlySuitable(self_ref().callbacks[group_name][event_name],event=event,widget=self_ref().widget_ref())
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285
205
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286 listener = self.getListener(event_name)
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287
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288 if event_name not in listener.events:
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289 listener.events[event_name] = {group_name : captured_f}
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290 else:
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291 listener.events[event_name][group_name] = captured_f
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292 listener.attach(self.widget_ref())
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293
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294
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295 def splitEventDescriptor(name):
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296 """ Utility function to split "widgetName/eventName" descriptions into tuples. """
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297 L = name.split("/")
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298 if len(L) not in (1,2,3):
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299 raise exceptions.RuntimeError("Invalid widgetname / eventname combination: " + name)
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300 if len(L) == 1:
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301 L = L[0],"action"
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302 elif L[1] not in EVENTS:
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303 raise exceptions.RuntimeError("Unknown event name: " + name)
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304 if len(L) == 2:
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305 L = L[0],L[1],"default"
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306 return L