thermostat/pytec/view/ctrl_panel.py

from PyQt6.QtCore import pyqtSignal, QObject, QSignalBlocker, pyqtSlot
import pyqtgraph.parametertree.parameterTypes as pTypes
from pyqtgraph.parametertree import (
    Parameter,
    registerParameterType,
)


class MutexParameter(pTypes.ListParameter):
    """
    Mutually exclusive parameter where only one of its children is visible at a time, list selectable.

    The ordering of the list items determines which children will be visible.
    """

    def __init__(self, **opts):
        super().__init__(**opts)

        self.sigValueChanged.connect(self.show_chosen_child)
        self.sigValueChanged.emit(self, self.opts["value"])

    def _get_param_from_value(self, value):
        if isinstance(self.opts["limits"], dict):
            values_list = list(self.opts["limits"].values())
        else:
            values_list = self.opts["limits"]

        return self.children()[values_list.index(value)]

    @pyqtSlot(object, object)
    def show_chosen_child(self, value):
        for param in self.children():
            param.hide()

        child_to_show = self._get_param_from_value(value.value())
        child_to_show.show()

        if child_to_show.opts.get("triggerOnShow", None):
            child_to_show.sigValueChanged.emit(child_to_show, child_to_show.value())


registerParameterType("mutex", MutexParameter)


class CtrlPanel(QObject):
    set_zero_limits_warning_sig = pyqtSignal(list)

    def __init__(
        self,
        trees_ui,
        param_tree,
        sigTreeStateChanged_handle,
        sigActivated_handles,
        parent=None,
    ):
        super().__init__(parent)

        self.trees_ui = trees_ui
        self.NUM_CHANNELS = len(trees_ui)

        self.THERMOSTAT_PARAMETERS = [param_tree for i in range(self.NUM_CHANNELS)]

        self.params = [
            Parameter.create(
                name=f"Thermostat Channel {ch} Parameters",
                type="group",
                value=ch,
                children=self.THERMOSTAT_PARAMETERS[ch],
            )
            for ch in range(self.NUM_CHANNELS)
        ]

        for i, param in enumerate(self.params):
            param.channel = i

        for i, tree in enumerate(self.trees_ui):
            tree.setHeaderHidden(True)
            tree.setParameters(self.params[i], showTop=False)
            self.params[i].setValue = self._setValue
            self.params[i].sigTreeStateChanged.connect(sigTreeStateChanged_handle)

            for handle in sigActivated_handles[i]:
                self.params[i].child(*handle[0]).sigActivated.connect(handle[1])

    def _setValue(self, value, blockSignal=None):
        """
        Implement 'lock' mechanism for Parameter Type

        Modified from the source
        """
        try:
            if blockSignal is not None:
                self.sigValueChanged.disconnect(blockSignal)
            value = self._interpretValue(value)
            if fn.eq(self.opts["value"], value):
                return value

            if "lock" in self.opts.keys():
                if self.opts["lock"]:
                    return value
            self.opts["value"] = value
            self.sigValueChanged.emit(
                self, value
            )  # value might change after signal is received by tree item
        finally:
            if blockSignal is not None:
                self.sigValueChanged.connect(blockSignal)

        return self.opts["value"]

    def change_params_title(self, channel, path, title):
        self.params[channel].child(*path).setOpts(title=title)

    @pyqtSlot("QVariantList")
    def update_pid(self, pid_settings):
        for settings in pid_settings:
            channel = settings["channel"]
            with QSignalBlocker(self.params[channel]):
                self.params[channel].child("PID Config", "Kp").setValue(
                    settings["parameters"]["kp"]
                )
                self.params[channel].child("PID Config", "Ki").setValue(
                    settings["parameters"]["ki"]
                )
                self.params[channel].child("PID Config", "Kd").setValue(
                    settings["parameters"]["kd"]
                )
                self.params[channel].child(
                    "PID Config", "PID Output Clamping", "Minimum"
                ).setValue(settings["parameters"]["output_min"] * 1000)
                self.params[channel].child(
                    "PID Config", "PID Output Clamping", "Maximum"
                ).setValue(settings["parameters"]["output_max"] * 1000)
                self.params[channel].child(
                    "Output Config", "Control Method", "Set Temperature"
                ).setValue(settings["target"])

    @pyqtSlot("QVariantList")
    def update_report(self, report_data):
        for settings in report_data:
            channel = settings["channel"]
            with QSignalBlocker(self.params[channel]):
                self.params[channel].child("Output Config", "Control Method").setValue(
                    "Temperature PID" if settings["pid_engaged"] else "Constant Current"
                )
                self.params[channel].child(
                    "Output Config", "Control Method", "Set Current"
                ).setValue(settings["i_set"] * 1000)
                if settings["temperature"] is not None:
                    self.params[channel].child("Temperature").setValue(
                        settings["temperature"]
                    )
                    if settings["tec_i"] is not None:
                        self.params[channel].child("Current through TEC").setValue(
                            settings["tec_i"] * 1000
                        )

    @pyqtSlot("QVariantList")
    def update_thermistor(self, sh_data):
        for sh_param in sh_data:
            channel = sh_param["channel"]
            with QSignalBlocker(self.params[channel]):
                self.params[channel].child("Thermistor Config", "T₀").setValue(
                    sh_param["params"]["t0"] - 273.15
                )
                self.params[channel].child("Thermistor Config", "R₀").setValue(
                    sh_param["params"]["r0"]
                )
                self.params[channel].child("Thermistor Config", "B").setValue(
                    sh_param["params"]["b"]
                )

    @pyqtSlot("QVariantList")
    def update_pwm(self, pwm_data):
        channels_zeroed_limits = [set() for i in range(self.NUM_CHANNELS)]

        for pwm_params in pwm_data:
            channel = pwm_params["channel"]
            with QSignalBlocker(self.params[channel]):
                self.params[channel].child(
                    "Output Config", "Limits", "Max Voltage Difference"
                ).setValue(pwm_params["max_v"]["value"])
                self.params[channel].child(
                    "Output Config", "Limits", "Max Cooling Current"
                ).setValue(pwm_params["max_i_pos"]["value"] * 1000)
                self.params[channel].child(
                    "Output Config", "Limits", "Max Heating Current"
                ).setValue(pwm_params["max_i_neg"]["value"] * 1000)

            for limit in "max_i_pos", "max_i_neg", "max_v":
                if pwm_params[limit]["value"] == 0.0:
                    channels_zeroed_limits[channel].add(limit)
        self.set_zero_limits_warning_sig.emit(channels_zeroed_limits)

    @pyqtSlot("QVariantList")
    def update_postfilter(self, postfilter_data):
        for postfilter_params in postfilter_data:
            channel = postfilter_params["channel"]
            with QSignalBlocker(self.params[channel]):
                self.params[channel].child(
                    "Thermistor Config", "Postfilter Rate"
                ).setValue(postfilter_params["rate"])