[3bdbfcc] | 1 | """ |
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| 2 | Allows users to modify the box slicer parameters. |
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| 3 | """ |
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[57b7ee2] | 4 | import functools |
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[3bdbfcc] | 5 | from PyQt4 import QtGui |
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| 6 | from PyQt4 import QtCore |
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[57b7ee2] | 7 | from PyQt4 import QtWebKit |
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[3bdbfcc] | 8 | |
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| 9 | # Local UI |
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| 10 | from sas.qtgui.UI.SlicerParametersUI import Ui_SlicerParametersUI |
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| 11 | |
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| 12 | class SlicerParameters(QtGui.QDialog, Ui_SlicerParametersUI): |
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| 13 | """ |
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| 14 | Interaction between the QTableView and the underlying model, |
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| 15 | passed from a slicer instance. |
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| 16 | """ |
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[57b7ee2] | 17 | close_signal = QtCore.pyqtSignal() |
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[3bdbfcc] | 18 | def __init__(self, parent=None, model=None): |
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| 19 | super(SlicerParameters, self).__init__() |
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| 20 | |
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| 21 | self.setupUi(self) |
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| 22 | assert isinstance(model, QtGui.QStandardItemModel) |
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| 23 | |
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| 24 | self.model = model |
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| 25 | |
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| 26 | # Define a proxy model so cell enablement can be finegrained. |
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| 27 | self.proxy = ProxyModel(self) |
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| 28 | self.proxy.setSourceModel(self.model) |
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| 29 | |
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| 30 | # Set the proxy model for display in the Table View. |
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| 31 | self.lstParams.setModel(self.proxy) |
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| 32 | |
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| 33 | # Disallow edit of the parameter name column. |
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| 34 | self.lstParams.model().setColumnReadOnly(0, True) |
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| 35 | |
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[57b7ee2] | 36 | # Specify the validator on the parameter value column. |
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| 37 | self.lstParams.setItemDelegate(ValidatedItemDelegate()) |
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| 38 | |
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| 39 | # Display Help on clicking the button |
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| 40 | self.buttonBox.button(QtGui.QDialogButtonBox.Help).clicked.connect(self.onHelp) |
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| 41 | |
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| 42 | # Close doesn't trigger closeEvent automatically, so force it |
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| 43 | self.buttonBox.button(QtGui.QDialogButtonBox.Close).clicked.connect(functools.partial(self.closeEvent,None)) |
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| 44 | |
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[b789967] | 45 | # Disable row number display |
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| 46 | self.lstParams.verticalHeader().setVisible(False) |
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[57b7ee2] | 47 | self.lstParams.setAlternatingRowColors(True) |
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| 48 | self.lstParams.setSizePolicy(QtGui.QSizePolicy.MinimumExpanding, QtGui.QSizePolicy.Expanding) |
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| 49 | |
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| 50 | # Header properties for nicer display |
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| 51 | header = self.lstParams.horizontalHeader() |
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| 52 | header.setResizeMode(QtGui.QHeaderView.Stretch) |
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| 53 | header.setStretchLastSection(True) |
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| 54 | |
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| 55 | |
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| 56 | def setModel(self, model): |
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| 57 | """ Model setter """ |
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| 58 | self.model = model |
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| 59 | self.proxy.setSourceModel(self.model) |
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| 60 | |
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| 61 | def closeEvent(self, event): |
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| 62 | """ |
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| 63 | Overwritten close widget method in order to send the close |
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| 64 | signal to the parent. |
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| 65 | """ |
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| 66 | self.close_signal.emit() |
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| 67 | if event: |
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| 68 | event.accept() |
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| 69 | |
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| 70 | def onHelp(self): |
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| 71 | """ |
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| 72 | Display generic data averaging help |
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| 73 | """ |
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| 74 | location = "docs/sphinx-docs/build/html" + \ |
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| 75 | "/user/sasgui/guiframe/graph_help.html#d-data-averaging" |
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| 76 | self._helpView = QtWebKit.QWebView() |
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| 77 | self._helpView.load(QtCore.QUrl(location)) |
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| 78 | self._helpView.show() |
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[b789967] | 79 | |
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[3bdbfcc] | 80 | |
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| 81 | class ProxyModel(QtGui.QIdentityProxyModel): |
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| 82 | """ |
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| 83 | Trivial proxy model with custom column edit flag |
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| 84 | """ |
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| 85 | def __init__(self, parent=None): |
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| 86 | super(ProxyModel, self).__init__(parent) |
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| 87 | self._columns = set() |
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| 88 | |
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| 89 | def columnReadOnly(self, column): |
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| 90 | return column in self._columns |
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| 91 | |
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| 92 | def setColumnReadOnly(self, column, readonly=True): |
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| 93 | if readonly: |
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| 94 | self._columns.add(column) |
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| 95 | else: |
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| 96 | self._columns.discard(column) |
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| 97 | |
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| 98 | def flags(self, index): |
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| 99 | flags = super(ProxyModel, self).flags(index) |
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| 100 | if self.columnReadOnly(index.column()): |
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| 101 | flags &= ~QtCore.Qt.ItemIsEditable |
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| 102 | return flags |
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| 103 | |
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| 104 | |
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| 105 | class ValidatedItemDelegate(QtGui.QStyledItemDelegate): |
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| 106 | """ |
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| 107 | Simple delegate enabling adding a validator to a cell editor. |
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| 108 | """ |
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| 109 | def createEditor(self, widget, option, index): |
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| 110 | if not index.isValid(): |
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| 111 | return 0 |
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| 112 | if index.column() == 1: # Edir only cells in the second column |
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| 113 | editor = QtGui.QLineEdit(widget) |
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| 114 | validator = QtGui.QDoubleValidator() |
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[b789967] | 115 | # Don't use the scientific notation, cause 'e'. |
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| 116 | validator.setNotation(QtGui.QDoubleValidator.StandardNotation) |
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[3bdbfcc] | 117 | editor.setValidator(validator) |
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| 118 | return editor |
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| 119 | return super(ValidatedItemDelegate, self).createEditor(widget, option, index) |
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