source: sasview/src/sas/qtgui/SlicerParameters.py @ 3bdbfcc

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Last change on this file since 3bdbfcc was 3bdbfcc, checked in by Piotr Rozyczko <rozyczko@…>, 6 years ago

Reimplementation of the slicer functionality

  • Property mode set to 100755
File size: 2.3 KB
Line 
1"""
2Allows users to modify the box slicer parameters.
3"""
4from PyQt4 import QtGui
5from PyQt4 import QtCore
6
7# Local UI
8from sas.qtgui.UI.SlicerParametersUI import Ui_SlicerParametersUI
9
10class SlicerParameters(QtGui.QDialog, Ui_SlicerParametersUI):
11    """
12    Interaction between the QTableView and the underlying model,
13    passed from a slicer instance.
14    """
15    def __init__(self, parent=None, model=None):
16        super(SlicerParameters, self).__init__()
17
18        self.setupUi(self)
19        assert isinstance(model, QtGui.QStandardItemModel)
20
21        self.model = model
22
23        # Define a proxy model so cell enablement can be finegrained.
24        self.proxy = ProxyModel(self)
25        self.proxy.setSourceModel(self.model)
26
27        # Set the proxy model for display in the Table View.
28        self.lstParams.setModel(self.proxy)
29
30        # Disallow edit of the parameter name column.
31        self.lstParams.model().setColumnReadOnly(0, True)
32
33        # Specify the validator on the parameter value column.
34        self.lstParams.setItemDelegate(ValidatedItemDelegate())
35
36class ProxyModel(QtGui.QIdentityProxyModel):
37    """
38    Trivial proxy model with custom column edit flag
39    """
40    def __init__(self, parent=None):
41        super(ProxyModel, self).__init__(parent)
42        self._columns = set()
43
44    def columnReadOnly(self, column):
45        return column in self._columns
46
47    def setColumnReadOnly(self, column, readonly=True):
48        if readonly:
49            self._columns.add(column)
50        else:
51            self._columns.discard(column)
52
53    def flags(self, index):
54        flags = super(ProxyModel, self).flags(index)
55        if self.columnReadOnly(index.column()):
56            flags &= ~QtCore.Qt.ItemIsEditable
57        return flags
58
59
60class ValidatedItemDelegate(QtGui.QStyledItemDelegate):
61    """
62    Simple delegate enabling adding a validator to a cell editor.
63    """
64    def createEditor(self, widget, option, index):
65        if not index.isValid():
66            return 0
67        if index.column() == 1: # Edir only cells in the second column
68            editor = QtGui.QLineEdit(widget)
69            validator = QtGui.QDoubleValidator()
70            editor.setValidator(validator)
71            return editor
72        return super(ValidatedItemDelegate, self).createEditor(widget, option, index)
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