fix: QuickView issues when removing datasets (close #25)

.travis.yml

@@ -1,18 +1,24 @@
 notifications:
   email: false
-sudo: required
+addons:
+  apt:
+    packages:
+    # These packages are required for testing PyQT5 applications on linux
+    - x11-utils
+    - libxkbcommon-x11-0
 matrix:
  include:
  - os: osx
    language: generic
    env: MAC_PYTHON_VERSION=3.6
+   sudo: required
  - os: linux
    language: python
    python: 3.6
-before_install:
+   services: xvfb
+install:
 # install other dependencies
 - source ./.travis/${TRAVIS_OS_NAME}_setup_python.sh $MAC_PYTHON_VERSION
-install:
 # install binary packages
 - travis_retry pip install --upgrade pip
 - travis_retry pip install setuptools wheel

CHANGELOG

@@ -1,6 +1,7 @@
 2.0.0b3
  - enh: introduce FilterRay class for caching of hierarchy data (#6)
  - fix: minor plot updating issues
+ - fix: QuickView issues when removing datasets (#25)
 2.0.0b2
  - feat: support loading sessions with missing dataset paths (#5)
  - fix: don't use area_um, deform, and bright_avg box filters by

shapeout2/gui/main.py

@@ -278,6 +278,7 @@ def adopt_slot(self, slot_state):
             raise ValueError("Slot not in pipeline: {}".format(slot_id))
         self.adopt_pipeline(state)
 
+    @QtCore.pyqtSlot()
     def add_dataslot(self, paths=None):
         """Adds a dataslot to the pipeline"""
         if paths is None:
@@ -404,18 +405,20 @@ def on_action_develop(self, b):
         msg.setWindowTitle("Restart Shape-Out")
         msg.exec_()
 
-    def on_action_clear(self):
-        buttonReply = QtWidgets.QMessageBox.question(
-            self, 'Clear Session', "All progress will be lost. Continue?",
-            QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No,
-            QtWidgets.QMessageBox.No)
-        if buttonReply == QtWidgets.QMessageBox.Yes:
+    @QtCore.pyqtSlot()
+    def on_action_clear(self, assume_yes=False):
+        if assume_yes:
+            yes = True
+        else:
+            buttonReply = QtWidgets.QMessageBox.question(
+                self, 'Clear Session', "All progress will be lost. Continue?",
+                QtWidgets.QMessageBox.Yes | QtWidgets.QMessageBox.No,
+                QtWidgets.QMessageBox.No)
+            yes = buttonReply == QtWidgets.QMessageBox.Yes
+        if yes:
             session.clear_session(self.pipeline)
             self.adopt_pipeline(self.pipeline.__getstate__())
-            ret = True
-        else:
-            ret = False
-        return ret
+        return yes
 
     def on_action_docs(self):
         webbrowser.open("https://shapeout2.readthedocs.io")

shapeout2/gui/matrix/data_matrix.py

@@ -348,7 +348,11 @@ def get_matrix_indices(self, slot_id, filt_id):
     def get_quickview_ids(self):
         current = MatrixElement._quick_view_instance
         if current is not None:
-            state = self.__getstate__()
+            try:
+                state = self.__getstate__()
+            except KeyError:
+                # the state is not valid (issue #25)
+                return None, None
             for slot_id in state["elements"]:
                 ds_state = state["elements"][slot_id]
                 for filt_id in ds_state:

shapeout2/gui/quick_view/qv_main.py

@@ -26,21 +26,14 @@ def __init__(self, *args, **kwargs):
 
         self.setWindowTitle("Quick View (QV)")
 
-        # Initially, only show the info about how QuickView works
-        self.widget_tool.setEnabled(False)
-        self.widget_scatter.hide()
+        self._set_initial_ui()
 
         # Set scale options (with data)
         for cb in [self.comboBox_xscale, self.comboBox_yscale]:
             cb.clear()
             cb.addItem("linear", "linear")
             cb.addItem("logarithmic", "log")
 
-        # Hide settings/events by default
-        self.widget_event.setVisible(False)
-        self.widget_settings.setVisible(False)
-        self.widget_poly.setVisible(False)
-
         # settings button
         self.toolButton_event.toggled.connect(self.on_tool)
         self.toolButton_poly.toggled.connect(self.on_tool)
@@ -120,7 +113,7 @@ def __init__(self, *args, **kwargs):
                          )
 
         # set initial empty dataset
-        self.rtdc_ds = None
+        self._rtdc_ds = None
 
         # init events/features table
         self.tableWidget_feats.setColumnCount(2)
@@ -185,6 +178,34 @@ def __setstate__(self, state):
             self.checkBox_trace_raw.setChecked(event["trace raw"])
             self.checkBox_trace_legend.setChecked(event["trace legend"])
 
+    def _set_initial_ui(self):
+        # Initially, only show the info about how QuickView works
+        self.widget_tool.setEnabled(False)
+        self.widget_scatter.hide()
+        # Hide settings/events by default
+        self.widget_event.hide()
+        self.widget_settings.hide()
+        self.widget_poly.hide()
+        # show the how-to label
+        self.label_howto.show()
+
+    @property
+    def rtdc_ds(self):
+        """Dataset to plot; set to None initially and if the file is closed"""
+        if self._rtdc_ds is not None:
+            if isinstance(self._rtdc_ds, dclab.rtdc_dataset.RTDC_HDF5):
+                if not self._rtdc_ds._h5:
+                    # the file is closed
+                    self._rtdc_ds = None
+        # now check again
+        if self._rtdc_ds is None:
+            self._set_initial_ui()
+        return self._rtdc_ds
+
+    @rtdc_ds.setter
+    def rtdc_ds(self, rtdc_ds):
+        self._rtdc_ds = rtdc_ds
+
     def get_event_image(self, ds, event):
         state = self.__getstate__()
         imkw = self.imkw.copy()

tests/test_gui_quickview.py

@@ -0,0 +1,35 @@
+"""Test of data set functionalities"""
+import pathlib
+
+from PyQt5 import QtCore
+
+from shapeout2.gui.main import ShapeOut2
+
+
+def test_simple(qtbot):
+    """Open the main window and close it again"""
+    main_window = ShapeOut2()
+    main_window.close()
+
+
+def test_quickview_issue_25(qtbot):
+    mw = ShapeOut2()
+    qtbot.addWidget(mw)
+
+    # add a dataslot
+    path = pathlib.Path(__file__).parent / "data" / "calibration_beads_47.rtdc"
+    mw.add_dataslot(paths=[path])
+
+    assert len(mw.pipeline.slot_ids) == 1, "we added that"
+    assert len(mw.pipeline.filter_ids) == 1, "automatically added"
+
+    # activate a dataslot
+    slot_id = mw.pipeline.slot_ids[0]
+    filt_id = mw.pipeline.filter_ids[0]
+    em = mw.block_matrix.get_widget(slot_id, filt_id)
+    qtbot.mouseClick(em, QtCore.Qt.LeftButton, QtCore.Qt.ShiftModifier)
+    # did that work?
+    assert mw.toolButton_quick_view.isChecked()
+
+    # now clear the session (this raised the errror in #25)
+    mw.on_action_clear(assume_yes=True)