<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def block_signals(self):
 """Prevent the combos and dock listening for event changes."""

        self.disconnect_layer_listener()
        self.aggregation_layer_combo.blockSignals(True)
        self.exposure_layer_combo.blockSignals(True)
        self.hazard_layer_combo.blockSignals(True)