[#845] Reproduce the BPC choice dialog on Qt measurement-mode switch

DisplayCAL/ui/main_window.py

@@ -5574,14 +5574,19 @@ def measurement_mode_ctrl_handler(self, index: int) -> None:
         Mirrors wx's ``measurement_mode_ctrl_handler``, minus the old-Argyll
         "projector/adaptive mode unavailable" fallback dialogs (those only
         applied to Argyll versions far older than anything this Qt port
-        targets).
+        targets). The confirm-and-toggle-BPC prompt, a separate dialog, is
+        reproduced via :meth:`_confirm_black_point_correction_choice`.
 
         Args:
             index (int): The newly selected combo index.
         """
         if self._updating or index < 0:
             return
         code = self.get_measurement_mode()
+        cal_changed = (
+            code != getcfg("measurement_mode")
+            and getcfg("calibration.file", False) not in self.presets[1:]
+        )
         instrument_features = self.worker.get_instrument_features()
         if (
             code
@@ -5601,6 +5606,61 @@ def measurement_mode_ctrl_handler(self, index: int) -> None:
             setcfg("measurement_mode.highres", 1 if code and "H" in code else 0)
         setcfg("measurement_mode.projector", 1 if code and "p" in code else None)
         self.update_colorimeter_correction_matrix_ctrl()
+        if (
+            code
+            and self.get_trc()
+            and ("c" not in code or "p" in code)
+            and float(self.get_black_point_correction()) > 0
+            and getcfg("calibration.black_point_correction_choice.show")
+            and not getcfg("calibration.black_point_correction.auto")
+        ):
+            self._confirm_black_point_correction_choice(code, cal_changed)
+
+    def _confirm_black_point_correction_choice(
+        self, code: str, cal_changed: bool
+    ) -> None:
+        """Confirm-and-toggle black-point-correction prompt on mode switch.
+
+        Qt port of the "don't ask again" ``ConfirmDialog`` in wx's
+        ``measurement_mode_ctrl_handler``, shown when the newly selected
+        measurement mode implies black-point-correction should also toggle.
+
+        Args:
+            code: The (ColorHug-adjusted) measurement mode code from
+                :meth:`get_measurement_mode`.
+            cal_changed: Whether the mode switch itself already marked the
+                calibration as changed, so accepting shouldn't re-mark it.
+        """
+        turn_on = "c" in code
+        box = QMessageBox(self)
+        box.setWindowTitle(lang.getstr("calibration.black_point_correction"))
+        box.setIcon(QMessageBox.Question)
+        box.setText(lang.getstr("calibration.black_point_correction_choice"))
+        ok_button = box.addButton(
+            lang.getstr("turn_on" if turn_on else "turn_off"), QMessageBox.AcceptRole
+        )
+        box.addButton(lang.getstr("setting.keep_current"), QMessageBox.RejectRole)
+        checkbox = QCheckBox(lang.getstr("dialog.do_not_show_again"))
+        box.setCheckBox(checkbox)
+        message_box.exec_box(box)
+        setcfg(
+            "calibration.black_point_correction_choice.show",
+            int(not checkbox.isChecked()),
+        )
+        if box.clickedButton() is not ok_button:
+            return
+        bkpt_corr = 1.0 if turn_on else 0.0
+        if not cal_changed and bkpt_corr != getcfg(
+            "calibration.black_point_correction"
+        ):
+            self._mark_profile_settings_changed()
+        setcfg("calibration.black_point_correction", bkpt_corr)
+        was_updating = self._updating
+        self._updating = True
+        try:
+            self.update_calibration_controls()
+        finally:
+            self._updating = was_updating
 
     def update_measurement_mode_ctrl(self) -> None:
         """Populate the measurement-mode combo for the current instrument.

tests/test_ui_main_window.py

@@ -473,6 +473,195 @@ def test_measurement_mode_ctrl_rebuilds_on_instrument_change(window):
     assert before  # sanity: there was something to compare against
 
 
+# --- measurement_mode_ctrl_handler's BPC choice dialog (issue #845) ---------
+
+
+def _prime_bpc_choice_conditions(window, monkeypatch, code):
+    """Stub the guards in ``measurement_mode_ctrl_handler`` so its BPC-choice
+    dialog condition is met regardless of the stub worker's actual
+    instrument/measurement-mode state."""
+    setcfg("calibration.black_point_correction_choice.show", 1)
+    setcfg("calibration.black_point_correction.auto", 0)
+    monkeypatch.setattr(window, "get_measurement_mode", lambda: code)
+    monkeypatch.setattr(window, "get_trc", lambda: "2.4")
+    monkeypatch.setattr(window, "get_black_point_correction", lambda: "1.0")
+
+
+def test_measurement_mode_ctrl_handler_shows_bpc_choice_dialog_when_applicable(
+    window, monkeypatch
+):
+    # "l" has neither "c" nor "p", satisfying the guard's turn-off case
+    # (``"c" not in code``).
+    _prime_bpc_choice_conditions(window, monkeypatch, "l")
+    calls = []
+    monkeypatch.setattr(
+        window,
+        "_confirm_black_point_correction_choice",
+        lambda code, cal_changed: calls.append((code, cal_changed)),
+    )
+
+    window.measurement_mode_ctrl_handler(0)
+
+    assert calls and calls[0][0] == "l"
+
+
+def test_measurement_mode_ctrl_handler_skips_dialog_when_choice_hidden(
+    window, monkeypatch
+):
+    _prime_bpc_choice_conditions(window, monkeypatch, "l")
+    setcfg("calibration.black_point_correction_choice.show", 0)
+    calls = []
+    monkeypatch.setattr(
+        window,
+        "_confirm_black_point_correction_choice",
+        lambda *a, **k: calls.append(True),
+    )
+
+    window.measurement_mode_ctrl_handler(0)
+
+    assert calls == []
+
+
+def test_measurement_mode_ctrl_handler_skips_dialog_when_bpc_auto(
+    window, monkeypatch
+):
+    _prime_bpc_choice_conditions(window, monkeypatch, "c")
+    setcfg("calibration.black_point_correction.auto", 1)
+    calls = []
+    monkeypatch.setattr(
+        window,
+        "_confirm_black_point_correction_choice",
+        lambda *a, **k: calls.append(True),
+    )
+
+    window.measurement_mode_ctrl_handler(0)
+
+    assert calls == []
+
+
+def test_measurement_mode_ctrl_handler_skips_dialog_when_bpc_zero(
+    window, monkeypatch
+):
+    _prime_bpc_choice_conditions(window, monkeypatch, "c")
+    monkeypatch.setattr(window, "get_black_point_correction", lambda: "0.0")
+    calls = []
+    monkeypatch.setattr(
+        window,
+        "_confirm_black_point_correction_choice",
+        lambda *a, **k: calls.append(True),
+    )
+
+    window.measurement_mode_ctrl_handler(0)
+
+    assert calls == []
+
+
+def test_confirm_bpc_choice_turn_on_accept_persists_bpc(window, monkeypatch):
+    setcfg("calibration.black_point_correction", 0.0)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "accept"
+    _FakeBpcChoiceMessageBox.check_clicked = False
+    updated = []
+    monkeypatch.setattr(
+        window, "update_calibration_controls", lambda: updated.append(True)
+    )
+
+    window._confirm_black_point_correction_choice("c", cal_changed=True)
+
+    assert getcfg("calibration.black_point_correction") == 1.0
+    assert updated == [True]
+
+
+def test_confirm_bpc_choice_turn_off_accept_persists_bpc(window, monkeypatch):
+    setcfg("calibration.black_point_correction", 1.0)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "accept"
+    _FakeBpcChoiceMessageBox.check_clicked = False
+    monkeypatch.setattr(window, "update_calibration_controls", lambda: None)
+
+    window._confirm_black_point_correction_choice("l", cal_changed=True)
+
+    assert getcfg("calibration.black_point_correction") == 0.0
+
+
+def test_confirm_bpc_choice_keep_current_leaves_bpc_unchanged(window, monkeypatch):
+    setcfg("calibration.black_point_correction", 0.5)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "reject"
+    _FakeBpcChoiceMessageBox.check_clicked = False
+    updated = []
+    monkeypatch.setattr(
+        window, "update_calibration_controls", lambda: updated.append(True)
+    )
+
+    window._confirm_black_point_correction_choice("c", cal_changed=True)
+
+    assert getcfg("calibration.black_point_correction") == 0.5
+    assert updated == []
+
+
+def test_confirm_bpc_choice_checkbox_persists_regardless_of_button(
+    window, monkeypatch
+):
+    setcfg("calibration.black_point_correction_choice.show", 1)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "reject"
+    _FakeBpcChoiceMessageBox.check_clicked = True
+    monkeypatch.setattr(window, "update_calibration_controls", lambda: None)
+
+    window._confirm_black_point_correction_choice("c", cal_changed=True)
+
+    assert getcfg("calibration.black_point_correction_choice.show") == 0
+
+
+def test_confirm_bpc_choice_unchecked_keeps_showing_next_time(window, monkeypatch):
+    setcfg("calibration.black_point_correction_choice.show", 1)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "accept"
+    _FakeBpcChoiceMessageBox.check_clicked = False
+    monkeypatch.setattr(window, "update_calibration_controls", lambda: None)
+
+    window._confirm_black_point_correction_choice("c", cal_changed=True)
+
+    assert getcfg("calibration.black_point_correction_choice.show") == 1
+
+
+def test_confirm_bpc_choice_marks_settings_changed_when_cal_unchanged(
+    window, monkeypatch
+):
+    setcfg("calibration.black_point_correction", 0.0)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "accept"
+    _FakeBpcChoiceMessageBox.check_clicked = False
+    monkeypatch.setattr(window, "update_calibration_controls", lambda: None)
+    marked = []
+    monkeypatch.setattr(
+        window, "_mark_profile_settings_changed", lambda: marked.append(True)
+    )
+
+    window._confirm_black_point_correction_choice("c", cal_changed=False)
+
+    assert marked == [True]
+
+
+def test_confirm_bpc_choice_skips_mark_when_cal_already_changed(
+    window, monkeypatch
+):
+    setcfg("calibration.black_point_correction", 0.0)
+    monkeypatch.setattr(mw, "QMessageBox", _FakeBpcChoiceMessageBox)
+    _FakeBpcChoiceMessageBox.clicked_role = "accept"
+    _FakeBpcChoiceMessageBox.check_clicked = False
+    monkeypatch.setattr(window, "update_calibration_controls", lambda: None)
+    marked = []
+    monkeypatch.setattr(
+        window, "_mark_profile_settings_changed", lambda: marked.append(True)
+    )
+
+    window._confirm_black_point_correction_choice("c", cal_changed=True)
+
+    assert marked == []
+
+
 def test_colorimeter_correction_matrix_ctrl_hidden_when_ccxx_unsupported(window):
     # The stub worker's default argyll_version ([0, 0, 0]) can't use CCXX.
     assert window.colorimeter_correction_matrix_ctrl.isVisibleTo(window) is False
@@ -2565,6 +2754,24 @@ def clickedButton(self):
         return self._buttons[role]
 
 
+class _FakeBpcChoiceMessageBox(_FakeTwoButtonMessageBox):
+    """Extends :class:`_FakeTwoButtonMessageBox` with the "don't ask again"
+    checkbox :meth:`MainWindow._confirm_black_point_correction_choice` adds
+    via ``setCheckBox`` -- the real ``QCheckBox`` instance production code
+    creates is stored as-is, so tests can flip it via ``check_clicked`` to
+    simulate the user ticking it before the (mocked) modal closes."""
+
+    check_clicked = False  # set per-test
+
+    def setCheckBox(self, checkbox):
+        self._checkbox = checkbox
+
+    def exec_(self):
+        if self.check_clicked:
+            self._checkbox.setChecked(True)
+        return None
+
+
 def test_profile_btn_handler_stashes_apply_calibration_and_begins(
     window, monkeypatch
 ):