migrate pyqt5 to pyside6

shared/pyproject.toml

@@ -9,7 +9,10 @@ description = "Shared paths, prefs, theme, i18n, and logging for orisys-app"
 requires-python = ">=3.10"
 authors = [{ name = "Orisys-Tech" }]
 dependencies = [
-  "PyQt5>=5.15",
+  # Shared by both apps, which are PySide6-only (LGPLv3). `theme/qss.py` paints the chevron
+  # icons with it; nothing here may import another binding — enforced by
+  # apps/autocal/tests/test_binding_purity.py and apps/studio/tests/test_binding_purity.py.
+  "PySide6>=6.6",
   "opencv-python-headless>=4.10.0.84,<5",
   "numpy>=1.24.4",
   "scipy>=1.10.1",

shared/src/orisys_app_shared/theme/qss.py

@@ -33,8 +33,8 @@ def _arrow_icon_cache_dir() -> Path:
 def _paint_arrow(kind: str, fill: str) -> str:
     """Draw a small chevron PNG on demand; return its path ('' on failure)."""
     try:
-        from PyQt5.QtCore import QPointF, Qt
-        from PyQt5.QtGui import QColor, QImage, QPainter, QPolygonF
+        from PySide6.QtCore import QPointF, Qt
+        from PySide6.QtGui import QColor, QImage, QPainter, QPolygonF
     except Exception:  # pragma: no cover - headless import failure
         return ""
     try:
@@ -43,12 +43,12 @@ def _paint_arrow(kind: str, fill: str) -> str:
         path = _arrow_icon_cache_dir() / f"chevron_{kind}_{safe}.png"
         if path.is_file():
             return str(path)
-        image = QImage(size, size, QImage.Format_ARGB32)
-        image.fill(Qt.transparent)
+        image = QImage(size, size, QImage.Format.Format_ARGB32)
+        image.fill(Qt.GlobalColor.transparent)
         painter = QPainter(image)
-        painter.setRenderHint(QPainter.Antialiasing, True)
+        painter.setRenderHint(QPainter.RenderHint.Antialiasing, True)
         painter.setBrush(QColor(fill))
-        painter.setPen(Qt.NoPen)
+        painter.setPen(Qt.PenStyle.NoPen)
         half = size / 2.0
         top = size * 0.32
         bottom = size * 0.68

shared/tests/test_scene3d_contracts.py

@@ -464,6 +464,8 @@ def test_the_contract_layer_imports_without_qt_or_opengl():
     Checked in a **fresh interpreter**: asking ``sys.modules`` in this process only
     proves what some earlier test happened to import (it failed once the studio tests
     painted a widget before this file ran, which says nothing about the contract layer).
+    The Qt name checked is the binding the app uses (PySide6), which is the only one that
+    could be pulled in — the earlier spelling named PyQt5, before the migration.
     """
     import subprocess
     import sys
@@ -471,7 +473,7 @@ def test_the_contract_layer_imports_without_qt_or_opengl():
     script = (
         "import sys;"
         "import orisys_app_shared.scene3d.contracts as c;"
-        "print(','.join(m for m in ('OpenGL', 'PyQt5', 'cv2') if m in sys.modules))"
+        "print(','.join(m for m in ('OpenGL', 'PySide6', 'cv2') if m in sys.modules))"
     )
     result = subprocess.run(
         [sys.executable, "-c", script],