Allow opening statepoint files when one is already open

openmc_plotter/main_window.py

@@ -582,15 +582,18 @@ def openView(self):
             self.loadViewFile(filename)
 
     def openStatePoint(self):
-        # check for an alread-open statepoint
+        # confirm replacement when a statepoint is already open
         if self.model.statepoint:
-            msg_box = QMessageBox()
-            msg_box.setText("Please close the current statepoint file before "
-                            "opening a new one.")
+            msg_box = QMessageBox(self)
+            msg_box.setText("A statepoint file is currently open. Continue to "
+                            "close it and open a new one?")
             msg_box.setIcon(QMessageBox.Information)
-            msg_box.setStandardButtons(QMessageBox.Ok)
-            msg_box.exec()
-            return
+            msg_box.setStandardButtons(QMessageBox.Yes | QMessageBox.Cancel)
+            msg_box.setDefaultButton(QMessageBox.Cancel)
+            msg_box.button(QMessageBox.Yes).setText("Continue")
+            if msg_box.exec() != QMessageBox.Yes:
+                return
+            self.closeStatePoint()
         filename, ext = QFileDialog.getOpenFileName(self, "Open StatePoint",
                                                     ".", "*.h5")
         if filename:
@@ -635,6 +638,7 @@ def importProperties(self):
     def closeStatePoint(self):
         # remove the statepoint object and update the data menu
         filename = self.model.statepoint.filename
+        self.model.statepoint.close()
         self.model.statepoint = None
         self.model.currentView.selectedTally = None
         self.model.activeView.selectedTally = None

tests/test_statepoint_open_prompt.py

@@ -0,0 +1,140 @@
+from types import SimpleNamespace
+
+from openmc_plotter import main_window
+
+
+class FakeButton:
+    def __init__(self):
+        self.text = None
+
+    def setText(self, text):
+        self.text = text
+
+
+class FakeMessageBox:
+    Yes = 1
+    Cancel = 2
+    Ok = 4
+    Information = 8
+    Warning = 16
+    next_result = Cancel
+    instances = []
+
+    def __init__(self, *args, **kwargs):
+        self.text = None
+        self.icon = None
+        self.standard_buttons = None
+        self.default_button = None
+        self.buttons = {}
+        type(self).instances.append(self)
+
+    def setText(self, text):
+        self.text = text
+
+    def setIcon(self, icon):
+        self.icon = icon
+
+    def setStandardButtons(self, buttons):
+        self.standard_buttons = buttons
+
+    def setDefaultButton(self, button):
+        self.default_button = button
+
+    def button(self, button):
+        return self.buttons.setdefault(button, FakeButton())
+
+    def exec(self):
+        return type(self).next_result
+
+
+def make_window(events):
+    status_bar = SimpleNamespace(
+        showMessage=lambda message, timeout=None: events.append(
+            ("status", message, timeout)
+        )
+    )
+    statepoint = SimpleNamespace(
+        filename="current.h5",
+        close=lambda: events.append("close-current-statepoint"),
+    )
+    model = SimpleNamespace(
+        statepoint=statepoint,
+        currentView=SimpleNamespace(selectedTally=17),
+        activeView=SimpleNamespace(selectedTally=17),
+    )
+
+    def open_statepoint(filename):
+        events.append(("open-statepoint", filename))
+        model.statepoint = SimpleNamespace(
+            filename=filename,
+            close=lambda: events.append(("close-statepoint", filename)),
+        )
+
+    model.openStatePoint = open_statepoint
+
+    window = SimpleNamespace(
+        model=model,
+        statusBar=lambda: status_bar,
+        updateDataMenu=lambda: events.append("update-data-menu"),
+        tallyPanel=SimpleNamespace(
+            selectTally=lambda: events.append("select-tally"),
+            update=lambda: events.append("update-tally-panel"),
+        ),
+        plotIm=SimpleNamespace(updatePixmap=lambda: events.append("update-pixmap")),
+    )
+    window.closeStatePoint = lambda: main_window.MainWindow.closeStatePoint(window)
+    return window
+
+
+def test_open_statepoint_cancel_keeps_current_file(monkeypatch):
+    events = []
+    FakeMessageBox.instances = []
+    FakeMessageBox.next_result = FakeMessageBox.Cancel
+    window = make_window(events)
+
+    def fake_get_open_file_name(*args, **kwargs):
+        events.append("show-open-dialog")
+        return ("replacement.h5", "*.h5")
+
+    monkeypatch.setattr(main_window, "QMessageBox", FakeMessageBox)
+    monkeypatch.setattr(
+        main_window.QFileDialog, "getOpenFileName", fake_get_open_file_name
+    )
+
+    main_window.MainWindow.openStatePoint(window)
+
+    assert events == []
+    assert window.model.statepoint.filename == "current.h5"
+    assert len(FakeMessageBox.instances) == 1
+    assert FakeMessageBox.instances[0].text == (
+        "A statepoint file is currently open. Continue to close it and open "
+        "a new one?"
+    )
+    assert FakeMessageBox.instances[0].button(FakeMessageBox.Yes).text == "Continue"
+
+
+def test_open_statepoint_continue_closes_current_file_before_reopening(
+    monkeypatch,
+):
+    events = []
+    FakeMessageBox.instances = []
+    FakeMessageBox.next_result = FakeMessageBox.Yes
+    window = make_window(events)
+
+    def fake_get_open_file_name(*args, **kwargs):
+        events.append("show-open-dialog")
+        return ("replacement.h5", "*.h5")
+
+    monkeypatch.setattr(main_window, "QMessageBox", FakeMessageBox)
+    monkeypatch.setattr(
+        main_window.QFileDialog, "getOpenFileName", fake_get_open_file_name
+    )
+
+    main_window.MainWindow.openStatePoint(window)
+
+    assert events.index("close-current-statepoint") < events.index("show-open-dialog")
+    assert ("open-statepoint", "replacement.h5") in events
+    assert ("status", "Opened statepoint file: replacement.h5", 5000) in events
+    assert window.model.currentView.selectedTally is None
+    assert window.model.activeView.selectedTally is None
+    assert window.model.statepoint.filename == "replacement.h5"