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annotate engine/extensions/pychan/events.py @ 298:07709bffab8f

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*hope i fixed script-without-shebang part 3 the last one
author LinuxDonald@33b003aa-7bff-0310-803a-e67f0ece8222
date Sun, 05 Jul 2009 19:11:53 +0000
parents 51cc05d862f2
children 48c99636453e
rev   line source
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1 # -*- coding: utf-8 -*-
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2
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3 """\
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4 PyChan event handling (internal).
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5 =================================
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6
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7 Users shouldn't need to use this module directly.
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8 L{widgets.Widget.capture} and L{widgets.Widget.mapEvents} provide
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9 a convenient API to capture events.
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10
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11 Nevertheless to understand how its supposed to work
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12 take a look at L{EventMapper} and L{EventListenerBase}
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13
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14 Event callbacks
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15 ---------------
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16
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17 You can either write callbacks yourself or
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18 use L{tools.callBackWithArguments} or L{tools.attrSetCallback}
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19 to generate suitable callbacks.
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20
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21 Here's an example callback::
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22 def dumpEventInfo(event=0,widget=0):
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23 print widget, " received the event ", event
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24
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25 Note the signature - C{event} and C{widget} are keyword
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26 arguments passed to the callback. If doesn't accept either
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27 C{event} or C{widget} as argument, these are not passed.
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28
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29 This way a simple function which ignores C{event} or C{widget}
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30 can be used, while they are available if needed.
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31
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32 Currently only one callback can be set per event. In case
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33 you don't want to write your own callback that dispatches
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34 to different callbacks you can use L{tools.chainCallbacks}.
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35
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36 Available Events
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37 ----------------
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38
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39 """
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40
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41 from compat import guichan
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42 import widgets
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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 import fife_timer as timer
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50
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51 EVENTS = [
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52 "mouseEntered",
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53 "mouseExited",
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54 "mousePressed",
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55 "mouseReleased",
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56 "mouseClicked",
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57 "mouseMoved",
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58 "mouseWheelMovedUp",
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59 "mouseWheelMovedDown",
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60 "mouseDragged",
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61 "action",
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62 "keyPressed",
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63 "keyReleased",
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64 ]
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65
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66 # Add the EVENTS to the docs.
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67 __doc__ += "".join([" - %s\n" % event for event in EVENTS])
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68
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69 # The line before seems to leak the variable event into the global namespace ... remove that!
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70 # This is a python problem, addressed in python3
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71 try: del event
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72 except:pass
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73
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74 MOUSE_EVENT, KEY_EVENT, ACTION_EVENT = range(3)
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75 def getEventType(name):
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76 if "mouse" in name:
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77 return MOUSE_EVENT
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78 if "key" in name:
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79 return KEY_EVENT
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80 return ACTION_EVENT
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81
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82
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83 CALLBACK_NONE_MESSAGE = """\
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84 You passed None as parameter to %s.capture, which would normally remove a mapped event.
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85 But there was no event mapped. Did you accidently call a function instead of passing it?
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86 """
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87 class EventListenerBase(object):
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88 """
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89 Redirector for event callbacks.
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90 Use *only* from L{EventMapper}.
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91
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92 This class uses the SWIG director feature - overriden
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93 virtual methods are called from C++ to - listen to
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94 Guichan events.
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95
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96 """
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97 def __init__(self):
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98 super(EventListenerBase,self).__init__()
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99 self.events = {}
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100 self.indent = 0
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101 self.debug = get_manager().debug
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102 self.is_attached = False
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103
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104 def attach(self,widget):
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105 """
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106 Start receiving events.
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107 No need to call this manually.
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108 """
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109
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110 if self.is_attached:
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111 return
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112 if not self.events:
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113 return
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114 if self.debug: print "Attach:",self
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115 self.doAttach(widget.real_widget)
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116 self.widget_ref = weakref.ref(widget)
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117 self.is_attached = True
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118
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119 def detach(self):
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120 """
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121 Stop receiving events.
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122 No need to call this manually.
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123 """
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124 if not self.is_attached:
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125 return
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126 if self.debug: print "Detach:",self
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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():
255
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136 def delayed_f():
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137 f( event )
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138 timer.delayCall(0,delayed_f)
205
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139
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140 except:
234
e4dfdf4c11fd Workaround for a crash on Win32 when trying to print an event.
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141 print name, repr(event)
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142 traceback.print_exc()
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143 raise
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144
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145 finally:
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146 self.indent -= 4
157
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147
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148 def translateEvent(self,event_type,event):
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149 if event_type == MOUSE_EVENT:
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150 return get_manager().hook.translate_mouse_event(event)
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151 if event_type == KEY_EVENT:
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152 return get_manager().hook.translate_key_event(event)
157
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153 return event
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154
205
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155 class _ActionEventListener(EventListenerBase,guichan.ActionListener):
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156 def __init__(self):super(_ActionEventListener,self).__init__()
232
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157 def doAttach(self,real_widget): real_widget.addActionListener(self)
205
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158 def doDetach(self,real_widget): real_widget.removeActionListener(self)
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159
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160 def action(self,e): self._redirectEvent("action",e)
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161
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162 class _MouseEventListener(EventListenerBase,guichan.MouseListener):
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163 def __init__(self):super(_MouseEventListener,self).__init__()
232
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164 def doAttach(self,real_widget): real_widget.addMouseListener(self)
205
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165 def doDetach(self,real_widget): real_widget.removeMouseListener(self)
157
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166
205
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167 def mouseEntered(self,e): self._redirectEvent("mouseEntered",e)
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168 def mouseExited(self,e): self._redirectEvent("mouseExited",e)
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169 def mousePressed(self,e): self._redirectEvent("mousePressed",e)
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170 def mouseReleased(self,e): self._redirectEvent("mouseReleased",e)
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171 def mouseClicked(self,e): self._redirectEvent("mouseClicked",e)
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172 def mouseMoved(self,e): self._redirectEvent("mouseMoved",e)
220
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173 def mouseWheelMovedUp(self,e): self._redirectEvent("mouseWheelMovedUp",e)
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174 def mouseWheelMovedDown(self,e): self._redirectEvent("mouseWheelMovedDown",e)
205
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175 def mouseDragged(self,e): self._redirectEvent("mouseDragged",e)
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176
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177 class _KeyEventListener(EventListenerBase,guichan.KeyListener):
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178 def __init__(self):super(_KeyEventListener,self).__init__()
232
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179 def doAttach(self,real_widget): real_widget.addKeyListener(self)
205
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180 def doDetach(self,real_widget): real_widget.removeKeyListener(self)
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181
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182 def keyPressed(self,e): self._redirectEvent("keyPressed",e)
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183 def keyReleased(self,e): self._redirectEvent("keyReleased",e)
157
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184
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185 class EventMapper(object):
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186 """
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187 Handles events and callbacks for L{widgets.Widget}
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188 and derived classes.
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189
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190 Every PyChan widget has an L{EventMapper} instance
205
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191 as attribute B{event_mapper}.
157
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192
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193 This instance handles all necessary house-keeping.
251
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194 Such an event mapper can be either C{attached} or
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195 C{detached}. In its attached state an L{EventListenerBase}
157
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196 is added to the Guichan widget and will redirect
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197 the events to the callbacks.
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198
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199 In its detached state no events are received from the
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200 real Guichan widget.
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201
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202 The event mapper starts in the detached state.
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203 When a new event is captured the mapper attaches itself
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204 automatically. The widget doesn't need to handle that.
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205 """
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206 def __init__(self,widget):
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207 super(EventMapper,self).__init__()
232
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208 self.widget_ref = weakref.ref(widget)
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209 self.callbacks = {}
205
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210 self.listener = {
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211 KEY_EVENT : _KeyEventListener(),
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212 ACTION_EVENT : _ActionEventListener(),
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213 MOUSE_EVENT : _MouseEventListener(),
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214 }
157
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215 self.is_attached = False
205
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216 self.debug = get_manager().debug
157
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217
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218 def __repr__(self):
232
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219 return "EventMapper(%s)" % repr(self.widget_ref())
157
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220
232
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221 def attach(self):
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222 for listener in self.listener.values():
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223 listener.attach()
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224
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225 def detach(self):
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226 for listener in self.listener.values():
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227 listener.detach()
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228
157
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229
164
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230 def capture(self,event_name,callback,group_name):
157
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231 if event_name not in EVENTS:
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232 raise exceptions.RuntimeError("Unknown eventname: " + event_name)
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233
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234 if callback is None:
166
81a222e7bd25 Fixes for event handling.
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235 if self.isCaptured(event_name,group_name):
205
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236 self.removeEvent(event_name,group_name)
164
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237 elif self.debug:
232
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238 print CALLBACK_NONE_MESSAGE % str(self.widget_ref())
157
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239 return
205
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240 self.addEvent(event_name,callback,group_name)
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241
205
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242 def isCaptured(self,event_name,group_name="default"):
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243 return ("%s/%s" % (event_name,group_name)) in self.getCapturedEvents()
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244
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245 def getCapturedEvents(self):
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246 events = []
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247 for event_type, listener in self.listener.items():
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248 for event_name, group in listener.events.items():
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249 for group_name in group.keys():
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250 events.append( "%s/%s" % (event_name, group_name) )
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251 return events
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252
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253 def getListener(self,event_name):
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254 return self.listener[getEventType(event_name)]
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255
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256 def removeEvent(self,event_name,group_name):
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257 listener = self.getListener(event_name)
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258 del listener.events[event_name][group_name]
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259
205
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260 if not listener.events[event_name]:
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261 del listener.events[event_name]
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262 if not listener.events:
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263 listener.detach()
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264
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265 del self.callbacks[group_name][event_name]
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266 if len(self.callbacks[group_name]) <= 0:
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267 del self.callbacks[group_name]
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268
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269 def addEvent(self,event_name,callback,group_name):
157
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270 if not callable(callback):
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271 raise RuntimeError("An event callback must be either a callable or None - not %s" % repr(callback))
232
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272 # The closure self needs to keep a weak ref.
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273 # Otherwise the GC has problems.
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274 self_ref = weakref.ref(self)
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275
232
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276 # Set up callback dictionary. This should fix some GC issues
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277 if not self.callbacks.has_key(group_name):
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278 self.callbacks[group_name] = {}
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279
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280 if not self.callbacks[group_name].has_key(event_name):
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281 self.callbacks[group_name][event_name] = {}
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282
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283 self.callbacks[group_name][event_name] = callback
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284
157
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285 def captured_f(event):
255
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286 if self_ref() is not None:
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287 tools.applyOnlySuitable(self_ref().callbacks[group_name][event_name],event=event,widget=self_ref().widget_ref())
157
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288
205
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289 listener = self.getListener(event_name)
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290
205
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291 if event_name not in listener.events:
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292 listener.events[event_name] = {group_name : captured_f}
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293 else:
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294 listener.events[event_name][group_name] = captured_f
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295 listener.attach(self.widget_ref())
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296
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297
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298 def splitEventDescriptor(name):
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299 """ Utility function to split "widgetName/eventName" descriptions into tuples. """
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300 L = name.split("/")
164
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301 if len(L) not in (1,2,3):
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302 raise exceptions.RuntimeError("Invalid widgetname / eventname combination: " + name)
157
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303 if len(L) == 1:
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304 L = L[0],"action"
164
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305 elif L[1] not in EVENTS:
157
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306 raise exceptions.RuntimeError("Unknown event name: " + name)
164
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307 if len(L) == 2:
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308 L = L[0],L[1],"default"
232
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309 return L