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glitter/slider.py
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            self.connect('button-press-event', self.on_press_event) 
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            self.stage.connect('button-release-event', self.on_release_event)
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        tmp_value = self.value - (float(self._handle_image.get_width() / 2.0) / float(self.get_width()))
 
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        if self.get_width() > 0:
 
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            tmp_value = self.value - (float(self._handle_image.get_width() / 2.0) / float(self.get_width()))
 
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        else:
 
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            tmp_value = 0
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        self._range_image.set_natural_width(self.value)
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        self._handle_image.set_natural_x(tmp_value)