source: sasview/src/sas/qtgui/SlicerParameters.py @ 57b7ee2

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Last change on this file since 57b7ee2 was 57b7ee2, checked in by Piotr Rozyczko <rozyczko@…>, 5 years ago

Code review changes for Slicer Parameter Editor

  • Property mode set to 100644
File size: 3.9 KB
Line 
1"""
2Allows users to modify the box slicer parameters.
3"""
4import functools
5from PyQt4 import QtGui
6from PyQt4 import QtCore
7from PyQt4 import QtWebKit
8
9# Local UI
10from sas.qtgui.UI.SlicerParametersUI import Ui_SlicerParametersUI
11
12class SlicerParameters(QtGui.QDialog, Ui_SlicerParametersUI):
13    """
14    Interaction between the QTableView and the underlying model,
15    passed from a slicer instance.
16    """
17    close_signal = QtCore.pyqtSignal()
18    def __init__(self, parent=None, model=None):
19        super(SlicerParameters, self).__init__()
20
21        self.setupUi(self)
22        assert isinstance(model, QtGui.QStandardItemModel)
23
24        self.model = model
25
26        # Define a proxy model so cell enablement can be finegrained.
27        self.proxy = ProxyModel(self)
28        self.proxy.setSourceModel(self.model)
29
30        # Set the proxy model for display in the Table View.
31        self.lstParams.setModel(self.proxy)
32
33        # Disallow edit of the parameter name column.
34        self.lstParams.model().setColumnReadOnly(0, True)
35
36        # Specify the validator on the parameter value column.
37        self.lstParams.setItemDelegate(ValidatedItemDelegate())
38
39        # Display Help on clicking the button
40        self.buttonBox.button(QtGui.QDialogButtonBox.Help).clicked.connect(self.onHelp)
41
42        # Close doesn't trigger closeEvent automatically, so force it
43        self.buttonBox.button(QtGui.QDialogButtonBox.Close).clicked.connect(functools.partial(self.closeEvent,None))
44
45        # Disable row number display
46        self.lstParams.verticalHeader().setVisible(False)
47        self.lstParams.setAlternatingRowColors(True)
48        self.lstParams.setSizePolicy(QtGui.QSizePolicy.MinimumExpanding, QtGui.QSizePolicy.Expanding)
49
50        # Header properties for nicer display
51        header = self.lstParams.horizontalHeader()
52        header.setResizeMode(QtGui.QHeaderView.Stretch)
53        header.setStretchLastSection(True)
54
55
56    def setModel(self, model):
57        """ Model setter """
58        self.model = model
59        self.proxy.setSourceModel(self.model)
60
61    def closeEvent(self, event):
62        """
63        Overwritten close widget method in order to send the close
64        signal to the parent.
65        """
66        self.close_signal.emit()
67        if event:
68            event.accept()
69
70    def onHelp(self):
71        """
72        Display generic data averaging help
73        """
74        location = "docs/sphinx-docs/build/html" + \
75            "/user/sasgui/guiframe/graph_help.html#d-data-averaging"
76        self._helpView = QtWebKit.QWebView()
77        self._helpView.load(QtCore.QUrl(location))
78        self._helpView.show()
79
80
81class ProxyModel(QtGui.QIdentityProxyModel):
82    """
83    Trivial proxy model with custom column edit flag
84    """
85    def __init__(self, parent=None):
86        super(ProxyModel, self).__init__(parent)
87        self._columns = set()
88
89    def columnReadOnly(self, column):
90        return column in self._columns
91
92    def setColumnReadOnly(self, column, readonly=True):
93        if readonly:
94            self._columns.add(column)
95        else:
96            self._columns.discard(column)
97
98    def flags(self, index):
99        flags = super(ProxyModel, self).flags(index)
100        if self.columnReadOnly(index.column()):
101            flags &= ~QtCore.Qt.ItemIsEditable
102        return flags
103
104
105class ValidatedItemDelegate(QtGui.QStyledItemDelegate):
106    """
107    Simple delegate enabling adding a validator to a cell editor.
108    """
109    def createEditor(self, widget, option, index):
110        if not index.isValid():
111            return 0
112        if index.column() == 1: # Edir only cells in the second column
113            editor = QtGui.QLineEdit(widget)
114            validator = QtGui.QDoubleValidator()
115            # Don't use the scientific notation, cause 'e'.
116            validator.setNotation(QtGui.QDoubleValidator.StandardNotation)
117            editor.setValidator(validator)
118            return editor
119        return super(ValidatedItemDelegate, self).createEditor(widget, option, index)
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