feat : Add bec_signal_proxy to handle signals with option to unblock them manually.

bec_widgets/applications/alignment/alignment_1d/alignment_1d.py

@@ -5,10 +5,10 @@ It is a preliminary version of the GUI, which will be added to the main branch a
 import os
 from typing import Optional
 
-from bec_lib.device import Positioner, Signal
+from bec_lib.device import Positioner as BECPositioner
+from bec_lib.device import Signal as BECSignal
 from bec_lib.endpoints import MessageEndpoints
-from qtpy.QtCore import QSize
-from qtpy.QtCore import Signal as pyqtSignal
+from qtpy.QtCore import QSize, Signal
 from qtpy.QtGui import QIcon
 from qtpy.QtWidgets import QCheckBox, QDoubleSpinBox, QPushButton, QSpinBox, QVBoxLayout, QWidget
 
@@ -33,7 +33,7 @@ class Alignment1D(BECWidget, QWidget):
     """Alignment GUI to perform 1D scans"""
 
     # Emit a signal when a motion is ongoing
-    motion_is_active = pyqtSignal(bool)
+    motion_is_active = Signal(bool)
 
     def __init__(
         self, parent: Optional[QWidget] = None, client=None, gui_id: Optional[str] = None
@@ -198,14 +198,14 @@ class Alignment1D(BECWidget, QWidget):
     def _setup_motor_combobox(self) -> None:
         """Setup motor selection"""
         # FIXME after changing the filtering in the combobox
-        motors = [name for name in self.dev if isinstance(self.dev.get(name), Positioner)]
+        motors = [name for name in self.dev if isinstance(self.dev.get(name), BECPositioner)]
         self.ui.device_combobox.setCurrentText(motors[0])
         self.ui.device_combobox.set_device_filter("Positioner")
 
     def _setup_signal_combobox(self) -> None:
         """Setup signal selection"""
         # FIXME after changing the filtering in the combobox
-        signals = [name for name in self.dev if isinstance(self.dev.get(name), Signal)]
+        signals = [name for name in self.dev if isinstance(self.dev.get(name), BECSignal)]
         self.ui.device_combobox_2.setCurrentText(signals[0])
         self.ui.device_combobox_2.set_device_filter("Signal")
 

bec_widgets/utils/bec_signal_proxy.py

@@ -0,0 +1,54 @@
+""" This custom class is a thin wrapper around the SignalProxy class to allow signal calls to be blocked.
+Unblocking the proxy needs to be done through the slot unblock_proxy. The most likely use case for this class is
+when the callback function is potentially initiating a slower progress, i.e. requesting a data analysis routine to 
+analyse data. Requesting a new fit may lead to request piling up and an overall slow done of performance. This proxy
+will allow you to decide by yourself when to unblock and execute the callback again."""
+
+from pyqtgraph import SignalProxy
+from qtpy.QtCore import Signal, Slot
+
+
+class BECSignalProxy(SignalProxy):
+    """Thin wrapper around the SignalProxy class to allow signal calls to be blocked, but args still being stored
+
+    Args:
+        *args: Arguments to pass to the SignalProxy class
+        rateLimit (int): The rateLimit of the proxy
+        **kwargs: Keyword arguments to pass to the SignalProxy class
+
+    Example:
+    >>> proxy = BECSignalProxy(signal, rate_limit=25, slot=callback)"""
+
+    is_blocked = Signal(bool)
+
+    def __init__(self, *args, rateLimit=25, **kwargs):
+        super().__init__(*args, rateLimit=rateLimit, **kwargs)
+        self._blocking = False
+        self.old_args = None
+        self.new_args = None
+
+    @property
+    def blocked(self):
+        """Returns if the proxy is blocked"""
+        return self._blocking
+
+    @blocked.setter
+    def blocked(self, value: bool):
+        self._blocking = value
+        self.is_blocked.emit(value)
+
+    def signalReceived(self, *args):
+        """Receive signal, store the args and call signalReceived from the parent class if not blocked"""
+        self.new_args = args
+        if self.blocked is True:
+            return
+        self.blocked = True
+        self.old_args = args
+        super().signalReceived(*args)
+
+    @Slot()
+    def unblock_proxy(self):
+        """Unblock the proxy, and call the signalReceived method in case there was an update of the args."""
+        self.blocked = False
+        if self.new_args != self.old_args:
+            self.signalReceived(*self.new_args)

bec_widgets/utils/plot_indicator_items.py

@@ -241,12 +241,6 @@ class BECArrowItem(BECIndicatorItem):
             self.plot_item.removeItem(self.arrow_item)
         self.item_on_plot = False
 
-    def check_log(self):
-        """Checks if the x or y axis is in log scale and updates the internal state accordingly."""
-        self.is_log_x = self.plot_item.ctrl.logXCheck.isChecked()
-        self.is_log_y = self.plot_item.ctrl.logYCheck.isChecked()
-        self.set_position(self._pos)
-
     def cleanup(self) -> None:
         """Cleanup the item"""
         self.remove_from_plot()

bec_widgets/widgets/figure/plots/waveform/waveform.py

@@ -30,31 +30,6 @@ from bec_widgets.widgets.figure.plots.waveform.waveform_curve import (
 logger = bec_logger.logger
 
 
-class BECSignalProxy(pg.SignalProxy):
-    """Thin wrapper around the SignalProxy class to allow signal calls to be blocked, but args still being stored"""
-
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        self.blocking = False
-
-    def signalReceived(self, *args):
-        """Received signa, but store the args"""
-        self.args = args
-        if self.blocking:
-            return
-        # self.blocking = True
-        super().signalReceived(*args)
-
-    # def flush(self):
-    #     """If there is a signal queued send it out"""
-    #     super().flush()
-
-    @Slot()
-    def unblock_proxy(self):
-        """Unblock the proxy"""
-        self.blocking = False
-
-
 class Waveform1DConfig(SubplotConfig):
     color_palette: Optional[str] = Field(
         "magma", description="The color palette of the figure widget.", validate_default=True
@@ -147,7 +122,7 @@ class BECWaveform(BECPlotBase):
         self.proxy_update_plot = pg.SignalProxy(
             self.scan_signal_update, rateLimit=25, slot=self._update_scan_curves
         )
-        self.proxy_update_dap = BECSignalProxy(
+        self.proxy_update_dap = pg.SignalProxy(
             self.scan_signal_update, rateLimit=25, slot=self.refresh_dap
         )
         self.async_signal_update.connect(self.replot_async_curve)
@@ -1211,8 +1186,6 @@ class BECWaveform(BECPlotBase):
     @Slot(dict, dict)
     def update_dap(self, msg, metadata):
         """Callback for DAP response message."""
-        if self.proxy_update_dap is not None:
-            self.proxy_update_dap.unblock_proxy()
 
         # pylint: disable=unused-variable
         scan_id, x_name, x_entry, y_name, y_entry = msg["dap_request"].content["config"]["args"]

bec_widgets/widgets/stop_button/stop_button.py

@@ -50,7 +50,7 @@ class StopButton(BECWidget, QWidget):
         self.queue.request_scan_halt()
 
 
-if __name__ == "__main__":
+if __name__ == "__main__":  # pragma: no cover
     import sys
 
     from qtpy.QtWidgets import QApplication

tests/unit_tests/test_utils_bec_signal_proxy.py

@@ -0,0 +1,75 @@
+from unittest import mock
+
+import pyqtgraph as pg
+import pytest
+
+from bec_widgets.utils.bec_signal_proxy import BECSignalProxy
+from bec_widgets.widgets.dap_combo_box.dap_combo_box import DapComboBox
+
+from .client_mocks import mocked_client
+from .conftest import create_widget
+
+
+@pytest.fixture
+def dap_combo_box(qtbot, mocked_client):
+    """Fixture for TextBox widget to test BECSignalProxy with a simple widget"""
+    with mock.patch(
+        "bec_widgets.widgets.dap_combo_box.dap_combo_box.DapComboBox._validate_dap_model",
+        return_value=True,
+    ):
+        widget = create_widget(qtbot, DapComboBox, client=mocked_client)
+        yield widget
+
+
+def test_bec_signal_proxy(qtbot, dap_combo_box):
+    """Test BECSignalProxy"""
+    proxy_container = []
+
+    def proxy_callback(*args):
+        """A simple callback function for the proxy"""
+        proxy_container.append(args)
+
+    container = []
+
+    def all_callbacks(*args):
+        """A simple callback function for all signal calls"""
+        container.append(args)
+
+    proxy = BECSignalProxy(dap_combo_box.x_axis_updated, rateLimit=25, slot=proxy_callback)
+    pg_proxy = pg.SignalProxy(dap_combo_box.x_axis_updated, rateLimit=25, slot=all_callbacks)
+    qtbot.wait(200)
+    # Test that the proxy is blocked
+    assert container == []
+    assert proxy_container == []
+    # Set first value
+    dap_combo_box.x_axis = "samx"
+    qtbot.waitSignal(dap_combo_box.x_axis_updated, timeout=1000)
+    qtbot.wait(100)
+    assert container == [(("samx",),)]
+    assert proxy.blocked is True
+    assert proxy_container == [(("samx",),)]
+    # Set new value samy
+    dap_combo_box.x_axis = "samy"
+    qtbot.waitSignal(dap_combo_box.x_axis_updated, timeout=1000)
+    qtbot.wait(100)
+    assert container == [(("samx",),), (("samy",),)]
+    assert proxy.blocked is True
+    assert proxy_container == [(("samx",),)]
+    # Set new value samz
+    dap_combo_box.x_axis = "samz"
+    qtbot.waitSignal(dap_combo_box.x_axis_updated, timeout=1000)
+    qtbot.wait(100)
+    assert container == [(("samx",),), (("samy",),), (("samz",),)]
+    assert proxy.blocked is True
+    proxy.unblock_proxy()
+    qtbot.waitSignal(proxy.is_blocked, timeout=1000)
+    qtbot.wait(100)
+    assert proxy.blocked is True
+    assert proxy_container == [(("samx",),), (("samz",),)]
+    # Unblock the proxy again, no new argument received.
+    # The callback should not be called again.
+    proxy.unblock_proxy()
+    qtbot.waitSignal(proxy.is_blocked, timeout=1000)
+    qtbot.wait(100)
+    assert proxy.blocked is False
+    assert proxy_container == [(("samx",),), (("samz",),)]