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annotate engine/extensions/pychan/events.py @ 374:1115f7cae9a3

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Editor: * The editor will now force filenames to be lowercase, as VFS does not like uppercase path names. * If a map filename does not have a .xml extension on save, it will be automatically added. * Log modules set to "all" by default. Only new users will be affected by this without having to modify or remove their configuration file. * Log level set to LOGLEVEL_WARN
author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Sat, 21 Nov 2009 13:11:56 +0000
parents dfd48d49c044
children
rev   line source
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1 # -*- coding: utf-8 -*-
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2
331
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3 # ####################################################################
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4 # Copyright (C) 2005-2009 by the FIFE team
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5 # http://www.fifengine.de
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6 # This file is part of FIFE.
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7 #
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8 # FIFE is free software; you can redistribute it and/or
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9 # modify it under the terms of the GNU Lesser General Public
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10 # License as published by the Free Software Foundation; either
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11 # version 2.1 of the License, or (at your option) any later version.
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12 #
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13 # This library is distributed in the hope that it will be useful,
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14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 # Lesser General Public License for more details.
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17 #
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18 # You should have received a copy of the GNU Lesser General Public
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19 # License along with this library; if not, write to the
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20 # Free Software Foundation, Inc.,
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21 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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22 # ####################################################################
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23
251
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24 """\
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25 PyChan event handling (internal).
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26 =================================
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27
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28 Users shouldn't need to use this module directly.
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29 L{widgets.Widget.capture} and L{widgets.Widget.mapEvents} provide
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30 a convenient API to capture events.
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31
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32 Nevertheless to understand how its supposed to work
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33 take a look at L{EventMapper} and L{EventListenerBase}
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34
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35 Event callbacks
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36 ---------------
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37
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38 You can either write callbacks yourself or
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39 use L{tools.callBackWithArguments} or L{tools.attrSetCallback}
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40 to generate suitable callbacks.
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41
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42 Here's an example callback::
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43 def dumpEventInfo(event=0,widget=0):
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44 print widget, " received the event ", event
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45
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46 Note the signature - C{event} and C{widget} are keyword
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47 arguments passed to the callback. If doesn't accept either
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48 C{event} or C{widget} as argument, these are not passed.
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49
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50 This way a simple function which ignores C{event} or C{widget}
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51 can be used, while they are available if needed.
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52
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53 Currently only one callback can be set per event. In case
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54 you don't want to write your own callback that dispatches
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55 to different callbacks you can use L{tools.chainCallbacks}.
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56
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57 Available Events
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58 ----------------
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59
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60 """
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61
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62 from compat import guichan
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63 import widgets
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64
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65 import exceptions
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66 from internal import get_manager
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67 import tools
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68 import traceback
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69 import weakref
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70 import fife_timer as timer
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71
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72 EVENTS = [
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73 "mouseEntered",
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74 "mouseExited",
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75 "mousePressed",
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76 "mouseReleased",
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77 "mouseClicked",
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78 "mouseMoved",
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79 "mouseWheelMovedUp",
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80 "mouseWheelMovedDown",
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81 "mouseDragged",
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82 "action",
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83 "keyPressed",
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84 "keyReleased",
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85 ]
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86
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87 # Add the EVENTS to the docs.
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88 __doc__ += "".join([" - %s\n" % event for event in EVENTS])
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89
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90 # The line before seems to leak the variable event into the global namespace ... remove that!
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91 # This is a python problem, addressed in python3
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92 try: del event
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93 except:pass
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94
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95 MOUSE_EVENT, KEY_EVENT, ACTION_EVENT = range(3)
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96 def getEventType(name):
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97 if "mouse" in name:
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98 return MOUSE_EVENT
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99 if "key" in name:
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100 return KEY_EVENT
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101 return ACTION_EVENT
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102
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103
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104 CALLBACK_NONE_MESSAGE = """\
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105 You passed None as parameter to %s.capture, which would normally remove a mapped event.
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106 But there was no event mapped. Did you accidently call a function instead of passing it?
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107 """
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108 class EventListenerBase(object):
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109 """
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110 Redirector for event callbacks.
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111 Use *only* from L{EventMapper}.
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112
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113 This class uses the SWIG director feature - overriden
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114 virtual methods are called from C++ to - listen to
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115 Guichan events.
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116
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117 """
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118 def __init__(self):
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119 super(EventListenerBase,self).__init__()
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120 self.events = {}
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121 self.indent = 0
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122 self.debug = get_manager().debug
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123 self.is_attached = False
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124
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125 def attach(self,widget):
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126 """
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127 Start receiving events.
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128 No need to call this manually.
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129 """
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130
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131 if self.is_attached:
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132 return
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133 if not self.events:
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134 return
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135 if self.debug: print "Attach:",self
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diff changeset
136 self.doAttach(widget.real_widget)
232
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diff changeset
137 self.widget_ref = weakref.ref(widget)
205
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diff changeset
138 self.is_attached = True
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139
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diff changeset
140 def detach(self):
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141 """
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142 Stop receiving events.
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143 No need to call this manually.
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144 """
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145 if not self.is_attached:
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146 return
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147 if self.debug: print "Detach:",self
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148 self.is_attached = False
157
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149
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150 def _redirectEvent(self,name,event):
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151 self.indent += 4
205
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152 try:
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153 event = self.translateEvent(getEventType(name), event)
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154 if name in self.events:
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155 if self.debug: print "-"*self.indent, name
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diff changeset
156 for f in self.events[name].itervalues():
255
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diff changeset
157 def delayed_f():
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diff changeset
158 f( event )
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diff changeset
159 timer.delayCall(0,delayed_f)
205
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160
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diff changeset
161 except:
234
e4dfdf4c11fd Workaround for a crash on Win32 when trying to print an event.
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diff changeset
162 print name, repr(event)
205
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163 traceback.print_exc()
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164 raise
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165
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166 finally:
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167 self.indent -= 4
157
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168
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169 def translateEvent(self,event_type,event):
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170 if event_type == MOUSE_EVENT:
205
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171 return get_manager().hook.translate_mouse_event(event)
157
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172 if event_type == KEY_EVENT:
205
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173 return get_manager().hook.translate_key_event(event)
157
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174 return event
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175
205
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diff changeset
176 class _ActionEventListener(EventListenerBase,guichan.ActionListener):
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177 def __init__(self):super(_ActionEventListener,self).__init__()
232
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178 def doAttach(self,real_widget): real_widget.addActionListener(self)
205
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179 def doDetach(self,real_widget): real_widget.removeActionListener(self)
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180
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181 def action(self,e): self._redirectEvent("action",e)
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182
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183 class _MouseEventListener(EventListenerBase,guichan.MouseListener):
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184 def __init__(self):super(_MouseEventListener,self).__init__()
232
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185 def doAttach(self,real_widget): real_widget.addMouseListener(self)
205
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186 def doDetach(self,real_widget): real_widget.removeMouseListener(self)
157
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187
205
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188 def mouseEntered(self,e): self._redirectEvent("mouseEntered",e)
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189 def mouseExited(self,e): self._redirectEvent("mouseExited",e)
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190 def mousePressed(self,e): self._redirectEvent("mousePressed",e)
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191 def mouseReleased(self,e): self._redirectEvent("mouseReleased",e)
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192 def mouseClicked(self,e): self._redirectEvent("mouseClicked",e)
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193 def mouseMoved(self,e): self._redirectEvent("mouseMoved",e)
220
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194 def mouseWheelMovedUp(self,e): self._redirectEvent("mouseWheelMovedUp",e)
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195 def mouseWheelMovedDown(self,e): self._redirectEvent("mouseWheelMovedDown",e)
205
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196 def mouseDragged(self,e): self._redirectEvent("mouseDragged",e)
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197
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198 class _KeyEventListener(EventListenerBase,guichan.KeyListener):
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199 def __init__(self):super(_KeyEventListener,self).__init__()
232
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200 def doAttach(self,real_widget): real_widget.addKeyListener(self)
205
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201 def doDetach(self,real_widget): real_widget.removeKeyListener(self)
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202
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203 def keyPressed(self,e): self._redirectEvent("keyPressed",e)
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204 def keyReleased(self,e): self._redirectEvent("keyReleased",e)
157
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205
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206 class EventMapper(object):
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207 """
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208 Handles events and callbacks for L{widgets.Widget}
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209 and derived classes.
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210
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211 Every PyChan widget has an L{EventMapper} instance
205
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diff changeset
212 as attribute B{event_mapper}.
157
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213
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diff changeset
214 This instance handles all necessary house-keeping.
251
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diff changeset
215 Such an event mapper can be either C{attached} or
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diff changeset
216 C{detached}. In its attached state an L{EventListenerBase}
157
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217 is added to the Guichan widget and will redirect
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218 the events to the callbacks.
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219
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220 In its detached state no events are received from the
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diff changeset
221 real Guichan widget.
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222
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223 The event mapper starts in the detached state.
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224 When a new event is captured the mapper attaches itself
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225 automatically. The widget doesn't need to handle that.
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226 """
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227 def __init__(self,widget):
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228 super(EventMapper,self).__init__()
232
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diff changeset
229 self.widget_ref = weakref.ref(widget)
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diff changeset
230 self.callbacks = {}
205
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diff changeset
231 self.listener = {
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diff changeset
232 KEY_EVENT : _KeyEventListener(),
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diff changeset
233 ACTION_EVENT : _ActionEventListener(),
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diff changeset
234 MOUSE_EVENT : _MouseEventListener(),
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235 }
157
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236 self.is_attached = False
205
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diff changeset
237 self.debug = get_manager().debug
157
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238
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239 def __repr__(self):
232
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diff changeset
240 return "EventMapper(%s)" % repr(self.widget_ref())
157
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241
232
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242 def attach(self):
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diff changeset
243 for listener in self.listener.values():
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244 listener.attach()
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245
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246 def detach(self):
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247 for listener in self.listener.values():
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248 listener.detach()
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249
157
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250
164
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251 def capture(self,event_name,callback,group_name):
157
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252 if event_name not in EVENTS:
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253 raise exceptions.RuntimeError("Unknown eventname: " + event_name)
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254
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255 if callback is None:
166
81a222e7bd25 Fixes for event handling.
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256 if self.isCaptured(event_name,group_name):
205
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257 self.removeEvent(event_name,group_name)
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258 elif self.debug:
232
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259 print CALLBACK_NONE_MESSAGE % str(self.widget_ref())
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260 return
205
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261 self.addEvent(event_name,callback,group_name)
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262
205
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263 def isCaptured(self,event_name,group_name="default"):
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264 return ("%s/%s" % (event_name,group_name)) in self.getCapturedEvents()
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265
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266 def getCapturedEvents(self):
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267 events = []
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268 for event_type, listener in self.listener.items():
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269 for event_name, group in listener.events.items():
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270 for group_name in group.keys():
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271 events.append( "%s/%s" % (event_name, group_name) )
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272 return events
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273
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274 def getListener(self,event_name):
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275 return self.listener[getEventType(event_name)]
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276
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277 def removeEvent(self,event_name,group_name):
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278 listener = self.getListener(event_name)
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279 del listener.events[event_name][group_name]
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280
205
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281 if not listener.events[event_name]:
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282 del listener.events[event_name]
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283 if not listener.events:
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284 listener.detach()
232
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285
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286 del self.callbacks[group_name][event_name]
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287 if len(self.callbacks[group_name]) <= 0:
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288 del self.callbacks[group_name]
205
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289
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290 def addEvent(self,event_name,callback,group_name):
157
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291 if not callable(callback):
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292 raise RuntimeError("An event callback must be either a callable or None - not %s" % repr(callback))
232
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293 # The closure self needs to keep a weak ref.
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294 # Otherwise the GC has problems.
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295 self_ref = weakref.ref(self)
157
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296
232
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297 # Set up callback dictionary. This should fix some GC issues
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298 if not self.callbacks.has_key(group_name):
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299 self.callbacks[group_name] = {}
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300
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301 if not self.callbacks[group_name].has_key(event_name):
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302 self.callbacks[group_name][event_name] = {}
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303
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304 self.callbacks[group_name][event_name] = callback
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305
157
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306 def captured_f(event):
255
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307 if self_ref() is not None:
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308 tools.applyOnlySuitable(self_ref().callbacks[group_name][event_name],event=event,widget=self_ref().widget_ref())
157
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309
205
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310 listener = self.getListener(event_name)
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311
205
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312 if event_name not in listener.events:
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313 listener.events[event_name] = {group_name : captured_f}
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314 else:
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315 listener.events[event_name][group_name] = captured_f
232
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diff changeset
316 listener.attach(self.widget_ref())
157
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317
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318
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319 def splitEventDescriptor(name):
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320 """ Utility function to split "widgetName/eventName" descriptions into tuples. """
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321 L = name.split("/")
164
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322 if len(L) not in (1,2,3):
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323 raise exceptions.RuntimeError("Invalid widgetname / eventname combination: " + name)
157
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324 if len(L) == 1:
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325 L = L[0],"action"
164
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326 elif L[1] not in EVENTS:
157
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327 raise exceptions.RuntimeError("Unknown event name: " + name)
164
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328 if len(L) == 2:
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329 L = L[0],L[1],"default"
232
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330 return L