revert aseinputfilewidget deletion

MDANSE_GUI/Src/MDANSE_GUI/InputWidgets/AseInputFileWidget.py

@@ -0,0 +1,91 @@
+# **************************************************************************
+#
+# MDANSE: Molecular Dynamics Analysis for Neutron Scattering Experiments
+#
+# @file      Src/PyQtGUI/InputWidgets/InputFileWidget.py
+# @brief     Implements module/class/test InputFileWidget
+#
+# @homepage  https://www.isis.stfc.ac.uk/Pages/MDANSEproject.aspx
+# @license   GNU General Public License v3 or higher (see LICENSE)
+# @copyright Institut Laue Langevin 2013-now
+# @copyright ISIS Neutron and Muon Source, STFC, UKRI 2021-now
+# @authors   Scientific Computing Group at ILL (see AUTHORS)
+#
+# **************************************************************************
+
+from qtpy.QtWidgets import QLineEdit, QPushButton, QFileDialog, QComboBox
+from qtpy.QtCore import Slot
+from ase.io.formats import filetype
+
+from MDANSE.Framework.Configurators.AseInputFileConfigurator import (
+    AseInputFileConfigurator,
+)
+
+from MDANSE_GUI.InputWidgets.WidgetBase import WidgetBase
+from MDANSE_GUI.Widgets.GeneralWidgets import translate_file_associations
+
+
+class AseInputFileWidget(WidgetBase):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        configurator = kwargs.get("configurator", None)
+        if configurator is not None:
+            default_value = configurator.default
+        else:
+            default_value = ""
+        try:
+            parent = kwargs.get("parent", None)
+            self.default_path = parent.default_path
+        except KeyError:
+            self.default_path = "."
+            print("KeyError in InputFileWidget - can't get default path.")
+        except AttributeError:
+            self.default_path = "."
+            print("AttributeError in InputFileWidget - can't get default path.")
+        default_value = kwargs.get("default", "")
+        tooltip_text = kwargs.get("tooltip", "Specify a path to an existing file.")
+        file_association = kwargs.get("wildcard", "")
+        self._qt_file_association = translate_file_associations(file_association)
+        combo = QComboBox(self._base)
+        combo.addItems(AseInputFileConfigurator._allowed_formats)
+        combo.setEditable(False)
+        self._type_combo = combo
+        field = QLineEdit(self._base)
+        self._field = field
+        field.textChanged.connect(self.updateValue)
+        field.setText(str(default_value))
+        field.setToolTip(tooltip_text)
+        self._layout.addWidget(field)
+        self._layout.addWidget(combo)
+        button = QPushButton("Browse", self._base)
+        button.clicked.connect(self.valueFromDialog)
+        self._layout.addWidget(button)
+        self._configurator = configurator
+        self._file_dialog = QFileDialog.getOpenFileName
+        self.updateValue()
+
+    @Slot()
+    def valueFromDialog(self):
+        """A Slot defined to allow the GUI to be updated based on
+        the new path received from a FileDialog.
+        This will start a FileDialog, take the resulting path,
+        and emit a signal to update the value show by the GUI.
+        """
+        new_value = self._file_dialog(
+            self.parent(),  # the parent of the dialog
+            "Load a file",  # the label of the window
+            self.default_path,  # the initial search path
+            self._qt_file_association,  # text string specifying the file name filter.
+        )
+        if new_value is not None:
+            self._field.setText(new_value[0])
+            self.updateValue()
+            try:
+                type_guess = filetype(new_value[0])
+            except:
+                type_guess = "guess"
+            self._type_combo.setCurrentText(type_guess)
+
+    def get_widget_value(self):
+        """Collect the results from the input widgets and return the value."""
+        return self._field.text(), self._type_combo.currentText()