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1 #############################################################################
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2 #
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3 # Copyright (c) 2010 by Casey Duncan and contributors
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the MIT License
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7 # A copy of the license should accompany this distribution.
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8 # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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9 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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10 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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11 #
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12 #############################################################################
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13 """
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14 Modes manage the state and transition between different application modes.
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15 Typically such modes are presented as different screens that the user can
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16 navigate between, similar to the way a browser navigates web pages. Individual
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17 modes may be things like:
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18
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19 - Title screen
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20 - Options dialog
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21 - About screen
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22 - In-progress game
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23 - Inventory interface
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24
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25 The modal framework provides a simple mechanism to ensure that modes are
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26 activated and deactivated properly. An activated mode is running and receives
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27 events. A deactivated mode is paused and does not receive events.
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28
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29 Modes may be managed as a *last-in-first-out* stack, or as a list, or ring
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30 of modes in sequence, or some combination of all.
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31
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32 For example usage see: :ref:`the mode section of the tutorial <tut-mode-section>`.
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33 """
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34
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35 __version__ = '$Id$'
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36
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37 import abc
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38 import pyglet
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39 from grease.mode import *
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40
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41 class PygletManager(BaseManager):
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42 """Mode manager abstract base class using pyglet.
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43
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44 The mode manager keeps a stack of modes where a single mode
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45 is active at one time. As modes are pushed on and popped from
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46 the stack, the mode at the top is always active. The current
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47 active mode receives events from the manager's event dispatcher.
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48 """
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49
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50 event_dispatcher = None
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51 """:class:`pyglet.event.EventDispatcher` object that the
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52 active mode receive events from.
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53 """
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54
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55 def activate_mode(self, mode):
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56 """Perform actions to activate a node
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57
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58 :param mode: The :class: 'Mode' object to activate
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59 """
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60 BaseManager.activate_mode(self, mode)
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61 self.event_dispatcher.push_handlers(mode)
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62
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63 def deactivate_mode(self, mode):
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64 """Perform actions to deactivate a node
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65
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66 :param mode: The :class: 'Mode' object to deactivate
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67 """
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68 BaseManager.deactivate_mode(self, mode)
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69 self.event_dispatcher.remove_handlers(mode)
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70
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71 class Manager(PygletManager):
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72 """A basic mode manager that wraps a single
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73 :class:`pyglet.event.EventDispatcher` object for use by its modes.
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74 """
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75
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76 def __init__(self, event_dispatcher):
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77 self.modes = []
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78 self.event_dispatcher = event_dispatcher
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79
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80
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81 class ManagerWindow(PygletManager, pyglet.window.Window):
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82 """An integrated mode manager and pyglet window for convenience.
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83 The window is the event dispatcher used by modes pushed to
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84 this manager.
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85
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86 Constructor arguments are identical to :class:`pyglet.window.Window`
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87 """
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88
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89 def __init__(self, *args, **kw):
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90 super(ManagerWindow, self).__init__(*args, **kw)
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91 self.modes = []
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92 self.event_dispatcher = self
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93
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94 def on_key_press(self, symbol, modifiers):
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95 """Default :meth:`on_key_press handler`, pops the current mode on ``ESC``"""
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96 if symbol == pyglet.window.key.ESCAPE:
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97 self.pop_mode()
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98
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99 def on_last_mode_pop(self, mode):
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100 """Hook executed when the last mode is popped from the manager.
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101 When the last mode is popped from a window, an :meth:`on_close` event
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102 is dispatched.
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103
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104 :param mode: The :class:`Mode` object just popped from the manager
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105 """
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106 self.dispatch_event('on_close')
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107
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108
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109 class Mode(BaseMode):
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110 """Application mode abstract base class using pyglet
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111
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112 Subclasses must implement the :meth:`step` method
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113
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114 :param step_rate: The rate of :meth:`step()` calls per second.
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115
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116 :param master_clock: The :class:`pyglet.clock.Clock` interface used
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117 as the master clock that ticks the world's clock. This
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118 defaults to the main pyglet clock.
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119 """
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120 clock = None
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121 """The :class:`pyglet.clock.Clock` instance used as this mode's clock.
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122 You should use this clock to schedule tasks for this mode, so they
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123 properly respect when the mode is active or inactive
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124
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125 Example::
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126
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127 my_mode.clock.schedule_once(my_cool_function, 4)
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128 """
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129
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130 def __init__(self, step_rate=60, master_clock=pyglet.clock,
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131 clock_factory=pyglet.clock.Clock):
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132 BaseMode.__init__(self)
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133 self.step_rate = step_rate
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134 self.time = 0.0
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135 self.master_clock = master_clock
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136 self.clock = clock_factory(time_function=lambda: self.time)
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137 self.clock.schedule_interval(self.step, 1.0 / step_rate)
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138
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139 def on_activate(self):
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140 """Being called when the Mode is activated"""
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141 self.master_clock.schedule(self.tick)
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142
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143 def on_deactivate(self):
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144 """Being called when the Mode is deactivated"""
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145 self.master_clock.unschedule(self.tick)
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146
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147 def tick(self, dt):
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148 """Tick the mode's clock.
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149
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150 :param dt: The time delta since the last tick
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151 :type dt: float
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152 """
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153 self.time += dt
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154 self.clock.tick(poll=False)
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155
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156 @abc.abstractmethod
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157 def step(self, dt):
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158 """Execute a timestep for this mode. Must be defined by subclasses.
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159
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160 :param dt: The time delta since the last time step
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161 :type dt: float
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162 """
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163
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164 class Multi(BaseMulti, Mode):
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165 """A mode with multiple submodes. One submode is active at one time.
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166 Submodes can be switched to directly or switched in sequence. If
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167 the Multi is active, then one submode is always active.
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168
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169 Multis are useful when modes can switch in an order other than
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170 a LIFO stack, such as in "hotseat" multiplayer games, a
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171 "wizard" style ui, or a sequence of slides.
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172
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173 Note unlike a normal :class:`Mode`, a :class:`Multi` doesn't have it's own
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174 :attr:`clock` and :attr:`step_rate`. The active submode's are used
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175 instead.
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176 """
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177
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178 def __init__(self, submodes):
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179 BaseMulti.__init__(self, submodes)
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180 self.time = 0.0
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181
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182
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183 def _set_active_submode(self, submode):
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184 BaseMulti._set_active_submode(self, submode)
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185 self.master_clock = submode.master_clock
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186 self.clock = submode.clock
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187
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188 def clear_subnode(self):
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189 """Clear any subnmode data"""
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190 BaseMulti.clear_subnode(self)
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191 self.master_clock = None
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192 self.clock = None
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193
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194 def tick(self, dt):
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195 """Tick the active submode's clock.
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196
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197 :param dt: The time delta since the last tick
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198 :type dt: float
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199 """
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200 self.time += dt
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201 if self.active_submode is not None:
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202 self.active_submode.clock.tick(poll=False)
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203
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