feat(ui_builders_shared): implement def _icon_color_from_palette

scanslicer/ui_builders_shared.py

@@ -20,3 +20,18 @@ from PySide6.QtWidgets import (
 
 
 # _icon_color_from_palette: function definition for ScanSlicer behavior.
+def _icon_color_from_palette(palette):
+    if palette is None:
+        return "#f2f2f2"
+
+    button_text_color = palette.buttonText().color()
+    if button_text_color.isValid():
+        return button_text_color.name()
+
+    window_color = palette.window().color()
+    luma = (
+        (0.2126 * window_color.redF())
+        + (0.7152 * window_color.greenF())
+        + (0.0722 * window_color.blueF())
+    )
+    return "#1f1f1f" if luma >= 0.5 else "#f2f2f2"