52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
import hal
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import glib
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import time
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class HandlerClass:
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'''
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class with gladevcp callback handlers
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'''
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def on_button_press(self,widget,data=None):
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'''
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a callback method
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parameters are:
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the generating object instance, likte a GtkButton instance
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user data passed if any - this is currently unused but
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the convention should be retained just in case
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'''
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print ("on_button_press called")
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self.nhits += 1
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self.builder.get_object('hits').set_label("Hits: %d" % (self.nhits))
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def __init__(self, halcomp,builder,useropts):
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'''
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Handler classes are instantiated in the following state:
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- the widget tree is created, but not yet realized (no toplevel window.show() executed yet)
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- the halcomp HAL component is set up and the widhget tree's HAL pins have already been added to it
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- it is safe to add more hal pins because halcomp.ready() has not yet been called at this point.
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after all handlers are instantiated in command line and get_handlers() order, callbacks will be
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connected with connect_signals()/signal_autoconnect()
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The builder may be either of libglade or GtkBuilder type depending on the glade file format.
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'''
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self.halcomp = halcomp
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self.builder = builder
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self.nhits = 0
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def get_handlers(halcomp,builder,useropts):
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'''
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this function is called by gladevcp at import time (when this module is passed with '-u <modname>.py')
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return a list of object instances whose methods should be connected as callback handlers
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any method whose name does not begin with an underscore ('_') is a callback candidate
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the 'get_handlers' name is reserved - gladevcp expects it, so do not change
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'''
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return [HandlerClass(halcomp,builder,useropts)]
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