fix(theme): update pg axes on theme update

bec_widgets/utils/colors.py

@@ -29,6 +29,7 @@ def set_theme(theme: Literal["dark", "light", "auto"]):
     app = QApplication.instance()
     bec_qthemes.setup_theme(theme)
     pg.setConfigOption("background", "w" if app.theme["theme"] == "light" else "k")
+    app.theme_signal.theme_updated.emit(theme)
     apply_theme(theme)
 
     # pylint: disable=protected-access
@@ -37,6 +38,7 @@ def set_theme(theme: Literal["dark", "light", "auto"]):
 
     def callback():
         app.theme["theme"] = listener._theme.lower()
+        app.theme_signal.theme_updated.emit(app.theme["theme"])
         apply_theme(listener._theme.lower())
 
     listener = OSThemeSwitchListener(callback)
@@ -53,6 +55,7 @@ def apply_theme(theme: Literal["dark", "light"]):
     children = itertools.chain.from_iterable(
         top.findChildren(pg.GraphicsLayoutWidget) for top in app.topLevelWidgets()
     )
+    pg.setConfigOptions(foreground="d" if theme == "dark" else "k")
     for pg_widget in children:
         pg_widget.setBackground("k" if theme == "dark" else "w")
 

bec_widgets/widgets/figure/plots/plot_base.py

@@ -2,10 +2,11 @@ from __future__ import annotations
 
 from typing import Literal, Optional
 
+import bec_qthemes
 import pyqtgraph as pg
 from pydantic import BaseModel, Field
 from qtpy.QtCore import Signal, Slot
-from qtpy.QtWidgets import QWidget
+from qtpy.QtWidgets import QApplication, QWidget
 
 from bec_widgets.utils import BECConnector, ConnectionConfig
 from bec_widgets.utils.crosshair import Crosshair
@@ -98,6 +99,36 @@ class BECPlotBase(BECConnector, pg.GraphicsLayout):
 
         self.add_legend()
         self.crosshair = None
+        self.connect_to_theme_change()
+        self.apply_theme()
+
+    def connect_to_theme_change(self):
+        """Connect to the theme change signal."""
+        qapp = QApplication.instance()
+        if hasattr(qapp, "theme_signal"):
+            qapp.theme_signal.theme_updated.connect(self.apply_theme)
+
+    @Slot(str)
+    @Slot()
+    def apply_theme(self, theme: str | None = None):
+        """
+        Apply the theme to the plot widget.
+
+        Args:
+            theme(str, optional): The theme to be applied.
+        """
+        if theme is None:
+            qapp = QApplication.instance()
+            if hasattr(qapp, "theme"):
+                theme = qapp.theme["theme"]
+            else:
+                theme = "dark"
+        palette = bec_qthemes.load_palette(theme)
+        text_pen = pg.mkPen(color=palette.text().color())
+
+        for axis in ["left", "bottom", "right", "top"]:
+            self.plot_item.getAxis(axis).setPen(text_pen)
+            self.plot_item.getAxis(axis).setTextPen(text_pen)
 
     def set(self, **kwargs) -> None:
         """