source: sasview/src/sas/qtgui/Perspectives/Invariant/InvariantPerspective.py @ 469b4622

ESS_GUIESS_GUI_DocsESS_GUI_batch_fittingESS_GUI_bumps_abstractionESS_GUI_iss1116ESS_GUI_iss879ESS_GUI_iss959ESS_GUI_openclESS_GUI_orderingESS_GUI_sync_sascalc
Last change on this file since 469b4622 was 469b4622, checked in by Piotr Rozyczko <rozyczko@…>, 7 years ago

Minor perspective related work
  • Property mode set to 100644
File size: 23.4 KB
Line 
1# global
2import sys
3import os
4from PyQt4 import QtCore
5from PyQt4 import QtGui
6from PyQt4 import QtWebKit
7
8from twisted.internet import threads
9from twisted.internet import reactor
10
11# sas-global
12from sas.sascalc.invariant import invariant
13from sas.sasgui.guiframe.dataFitting import Data1D
14import GuiUtils
15
16# local
17from UI.TabbedInvariantUI import Ui_tabbedInvariantUI
18from InvariantDetails import DetailsDialog
19from InvariantUtils import WIDGETS
20
21# The minimum q-value to be used when extrapolating
22Q_MINIMUM = 1e-5
23# The maximum q-value to be used when extrapolating
24Q_MAXIMUM = 10
25# the ratio of maximum q value/(qmax of data) to plot the theory data
26Q_MAXIMUM_PLOT = 3
27
28
29class MyModel(object):
30    def __init__(self):
31        self._model = QtGui.QStandardItemModel(self)
32
33    def addItem(self, item):
34        item = QtGui.QStandardItem(str(item))
35        self._model.appendRow(item)
36
37class InvariantWindow(QtGui.QDialog, Ui_tabbedInvariantUI):
38    # The controller which is responsible for managing signal slots connections
39    # for the gui and providing an interface to the data model.
40    def __init__(self, manager=None, parent=None):
41        super(InvariantWindow, self).__init__(parent)
42        self.setupUi(self)
43
44        self.setWindowTitle("Invariant Perspective")
45
46        # initial input params
47        self._background = 0.0
48        self._scale = 1.0
49        self._contrast = 1.0
50        self._porod = 1.0
51        self._npoints_low = 10
52        self._npoints_high = 10
53        self._power_low = 4
54
55        self._manager = manager
56        self._reactor = self._manager.reactor()
57        self._model_item = QtGui.QStandardItem()
58
59        self._helpView = QtWebKit.QWebView()
60        self.detailsDialog = DetailsDialog(self)
61
62        self._low_extrapolate = False
63        self._low_guinier  = True
64        self._low_fit  = True
65        self._high_extrapolate = False
66        self._high_power_value  = False
67
68        # no reason to have this widget resizable
69        self.setFixedSize(self.minimumSizeHint())
70
71        self.communicate = GuiUtils.Communicate()
72
73        self._data = None
74        self._path = ""
75
76        # Mask file selector
77        ###################################################
78        #self._path = "cyl_400_20.txt"
79        #from sas.sascalc.dataloader.loader import  Loader
80        #loader = Loader()
81        #try:
82        #    self._data = loader.load(self._path)
83        #except:
84        #    raise
85        ###################################################
86
87        self.lineEdit_8.setText(str(Q_MINIMUM))
88        self.lineEdit_9.setText(str(Q_MAXIMUM))
89
90        # Let's choose the Standard Item Model.
91        self.model = QtGui.QStandardItemModel(self)
92
93        # Connect buttons to slots.
94        # Needs to be done early so default values propagate properly.
95        self.setupSlots()
96
97        # Set up the model.
98        self.setupModel()
99
100        # Set up the mapper
101        self.setupMapper()
102
103    def closeEvent(self, event):
104        """
105        Overwrite the default close method of QWidget
106        """
107        # No close on perspectives - one must always be active.
108        event.ignore()
109
110    def communicator(self):
111        """ Getter for the communicator """
112        return self.communicate
113
114    def updateFromModel(self):
115        """
116        update the globals based on the data in the model
117        """
118        self._background = float(self.model.item(WIDGETS.W_BACKGROUND).text())
119        self._contrast   = float(self.model.item(WIDGETS.W_CONTRAST).text())
120        self._scale      = float(self.model.item(WIDGETS.W_SCALE).text())
121
122        # High extrapolate
123        self._low_extrapolate = ( str(self.model.item(WIDGETS.W_ENABLE_LOWQ).text()) == 'true')
124        self._low_points = float(self.model.item(WIDGETS.W_NPTS_LOWQ).text())
125        self._low_guinier  = ( str(self.model.item(WIDGETS.W_LOWQ_GUINIER).text()) == 'true')
126        self._low_fit  = ( str(self.model.item(WIDGETS.W_LOWQ_FIT).text()) == 'true')
127        self._low_power_value  = float(self.model.item(WIDGETS.W_LOWQ_POWER_VALUE).text())
128
129        # High extrapolating
130        self._high_extrapolate = ( str(self.model.item(WIDGETS.W_ENABLE_HIGHQ).text()) == 'true')
131        self._high_points  = float(self.model.item(WIDGETS.W_NPTS_HIGHQ).text())
132        self._high_fit  = ( str(self.model.item(WIDGETS.W_HIGHQ_FIT).text()) == 'true')
133        self._high_power_value  = float(self.model.item(WIDGETS.W_HIGHQ_POWER_VALUE).text())
134
135    def calculateInvariant(self):
136        """
137        Use twisted to thread the calculations away.
138        """
139        # Find out if extrapolation needs to be used.
140        extrapolation = None
141        if self._low_extrapolate  and not self._high_extrapolate:
142            extrapolation = "low"
143        elif not self._low_extrapolate  and self._high_extrapolate:
144            extrapolation = "high"
145        elif self._low_extrapolate and self._high_extrapolate:
146            extrapolation = "both"
147        try:
148            # modify the Calculate button to indicate background process
149            self.pushButton.setText("Calculating...")
150            self.pushButton.setEnabled(False)
151            self.style = self.pushButton.styleSheet()
152            self.pushButton.setStyleSheet("background-color: rgb(255, 255, 0); color: rgb(0, 0, 0)")
153            # Send the calculations to separate thread.
154            d = threads.deferToThread(self.calculateThread, extrapolation)
155            # Add deferred callback for call return
156            d.addCallback(self.plotResult)
157        except Exception as ex:
158            # Set the button back to available
159            self.pushButton.setEnabled(True)
160            self.pushButton.setText("Calculate")
161            self.pushButton.setStyleSheet(self.style)
162
163
164    def plotResult(self, model):
165        """
166        """
167        self.model = model
168        self.mapper.toFirst()
169
170        # Set the button back to available
171        self.pushButton.setEnabled(True)
172        self.pushButton.setText("Calculate")
173        self.pushButton.setStyleSheet(self.style)
174
175        # Send the modified model item to DE for keeping in the model
176        self.communicate.updateModelFromPerspectiveSignal.emit(self._model_item)
177
178
179    def calculateThread(self, extrapolation):
180        """
181        Perform Invariant calculations.
182
183        TODO: Create a dictionary of results to be sent to DE on completion.
184        """
185        self.updateFromModel()
186
187        qstar_low = 0.0
188        qstar_low_err = 0.0
189        qstar_high = 0.0
190        qstar_high_err = 0.0
191        qstar_total = 0.0
192        qstar_total_low_err = 0.0
193
194        # Prepare the invariant object
195        inv = invariant.InvariantCalculator(data=self._data,
196                                            background = self._background,
197                                            scale = self._scale)
198
199        if self._low_extrapolate:
200            function_low = "power_law"
201            if self._low_guinier:
202                function_low = "guinier"
203            if self._low_fit:
204                self._low_power_value = None
205            inv.set_extrapolation(range="low",
206                                  npts=self._low_points,
207                                  function=function_low,
208                                  power=self._low_power_value)
209
210        if self._high_extrapolate:
211            function_low = "power_law"
212            inv.set_extrapolation(range="high",
213                                  npts=self._high_points,
214                                  function=function_low,
215                                  power=self._low_power_value)
216
217        #Compute invariant
218        # TODO: proper exception handling and logic -
219        # display info, update lineedits, don't run extrapolations etc.
220        calculation_failed = False
221        try:
222            qstar_total, qstar_total_error         = inv.get_qstar_with_error()
223        except Exception as ex:
224            calculation_failed = True
225            # Display relevant information
226            item = QtGui.QStandardItem("ERROR")
227            self.model.setItem(WIDGETS.W_INVARIANT, item)
228            item = QtGui.QStandardItem("ERROR")
229            self.model.setItem(WIDGETS.W_INVARIANT_ERR, item)
230        try:
231            volume_fraction, volume_fraction_error = \
232                inv.get_volume_fraction_with_error(self._contrast)
233        except Exception as ex:
234            calculation_failed = True
235            # Display relevant information
236            item = QtGui.QStandardItem("ERROR")
237            self.model.setItem(WIDGETS.W_VOLUME_FRACTION, item)
238            item = QtGui.QStandardItem("ERROR")
239            self.model.setItem(WIDGETS.W_VOLUME_FRACTION_ERR, item)
240        try:
241            surface, surface_error = \
242                inv.get_surface_with_error(self._contrast, self._porod)
243        except Exception as ex:
244            calculation_failed = True
245            # Display relevant information
246            item = QtGui.QStandardItem("ERROR")
247            self.model.setItem(WIDGETS.W_SPECIFIC_SURFACE, item)
248            item = QtGui.QStandardItem("ERROR")
249            self.model.setItem(WIDGETS.W_SPECIFIC_SURFACE_ERR, item)
250
251        if(calculation_failed):
252            # TODO: NOTIFY THE GUI MANAGER!!
253            self.mapper.toFirst()
254            return self.model
255
256        if self._low_extrapolate:
257            # for presentation in InvariantDetails
258            qstar_low, qstar_low_err = inv.get_qstar_low()
259            extrapolated_data = inv.get_extra_data_low(self._low_points)
260            power_low = inv.get_extrapolation_power(range='low')
261
262            #inv.data = extrapolated_data
263            #qstar_total, qstar_total_error = inv.get_qstar_with_error()
264
265            # Plot the chart
266            title = "Low-Q extrapolation"
267
268            # Convert the data into plottable
269            extrapolated_data = self._manager.createGuiData(extrapolated_data)
270
271            # Add the plot to the model item
272            # variant_item = QtCore.QVariant(self._plotter)
273            variant_item = QtCore.QVariant(extrapolated_data)
274
275            # This needs to run in the main thread
276            reactor.callFromThread(GuiUtils.updateModelItem, self._model_item, variant_item, title)
277
278        if self._high_extrapolate:
279            # for presentation in InvariantDetails
280            qmax_plot = Q_MAXIMUM_PLOT * max(self._data.x)
281            if qmax_plot > Q_MAXIMUM:
282                qmax_plot = Q_MAXIMUM
283            qstar_high, qstar_high_err = inv.get_qstar_high()
284            power_high = inv.get_extrapolation_power(range='high')
285            high_out_data = inv.get_extra_data_high(q_end=qmax_plot, npts=500)
286
287            # Convert the data into plottable
288            high_out_data = self._manager.createGuiData(high_out_data)
289
290            # find how to add this plot to the existing plot for low_extrapolate
291            # Plot the chart
292            title = "High-Q extrapolation"
293
294            # Add the plot to the model item
295            # variant_item = QtCore.QVariant(self._plotter)
296            variant_item = QtCore.QVariant(high_out_data)
297            # This needs to run in the main thread
298            reactor.callFromThread(GuiUtils.updateModelItem, self._model_item, variant_item, title)
299
300        item = QtGui.QStandardItem(str(float('%.5g'% volume_fraction)))
301        self.model.setItem(WIDGETS.W_VOLUME_FRACTION, item)
302        item = QtGui.QStandardItem(str(float('%.5g'% volume_fraction_error)))
303        self.model.setItem(WIDGETS.W_VOLUME_FRACTION_ERR, item)
304        item = QtGui.QStandardItem(str(float('%.5g'% surface)))
305        self.model.setItem(WIDGETS.W_SPECIFIC_SURFACE, item)
306        item = QtGui.QStandardItem(str(float('%.5g'% surface_error)))
307        self.model.setItem(WIDGETS.W_SPECIFIC_SURFACE_ERR, item)
308        item = QtGui.QStandardItem(str(float('%.5g'% qstar_total)))
309        self.model.setItem(WIDGETS.W_INVARIANT, item)
310        item = QtGui.QStandardItem(str(float('%.5g'% qstar_total_error)))
311        self.model.setItem(WIDGETS.W_INVARIANT_ERR, item)
312
313        #item = QtGui.QStandardItem(str(float('%.5g'% qstar_total)))
314        #self.model.setItem(WIDGETS.D_TOTAL_QSTAR, item)
315        #item = QtGui.QStandardItem(str(float('%.5g'% qstar_total_err)))
316        #self.model.setItem(WIDGETS.D_TOTAL_QSTAR_ERR, item)
317        item = QtGui.QStandardItem(str(float('%.5g'% qstar_low)))
318        self.model.setItem(WIDGETS.D_LOW_QSTAR, item)
319        item = QtGui.QStandardItem(str(float('%.5g'% qstar_low_err)))
320        self.model.setItem(WIDGETS.D_LOW_QSTAR_ERR, item)
321        item = QtGui.QStandardItem(str(float('%.5g'% qstar_high)))
322        self.model.setItem(WIDGETS.D_HIGH_QSTAR, item)
323        item = QtGui.QStandardItem(str(float('%.5g'% qstar_high_err)))
324        self.model.setItem(WIDGETS.D_HIGH_QSTAR_ERR, item)
325
326        self.mapper.toFirst()
327
328        return self.model
329               
330    def title(self):
331        """
332        Perspective name
333        """
334        return "Invariant panel"
335
336    def status(self):
337        """
338        """
339        self.detailsDialog.setModel(self.model)
340        self.detailsDialog.showDialog()
341
342    def help(self):
343        """
344        """
345        _TreeLocation = "html/user/sasgui/perspectives/invariant/invariant_help.html"
346        self._helpView.load(QtCore.QUrl(_TreeLocation))
347        self._helpView.show()
348
349    def setupSlots(self):
350        self.pushButton.clicked.connect(self.calculateInvariant)
351        self.pushButton_2.clicked.connect(self.status)
352        self.pushButton_3.clicked.connect(self.help)
353
354        self.radioButton.toggled.connect(self.lowGuinierAndPowerToggle)
355        self.radioButton_8.toggled.connect(self.hiFitAndFixToggle)
356
357        self.radioButton_3.toggled.connect(self.lowFitAndFixToggle)
358
359        # Bug workaround for QDataWidgetMapper() not reacting to checkbox clicks.
360        # https://bugreports.qt.io/browse/QTBUG-1818
361        self.checkBox.clicked.connect(self.setFocus)
362        self.checkBox_2.clicked.connect(self.setFocus)
363
364        self.model.itemChanged.connect(self.modelChanged)
365
366    def modelChanged(self, item):
367        """
368        """
369        if item.row() == WIDGETS.W_ENABLE_LOWQ:
370            toggle = (str(item.text()) == 'true')
371            self._low_extrapolate = toggle
372            self.lowQToggle(toggle)
373        elif item.row() == WIDGETS.W_ENABLE_HIGHQ:
374            toggle = (str(item.text()) == 'true')
375            self._high_extrapolate = toggle
376            self.highQToggle(toggle)
377       
378    def lowGuinierAndPowerToggle(self, toggle):
379        """
380        """
381        self._low_guinier = toggle
382        toggle = not toggle
383        self.lineEdit_11.setEnabled(toggle)
384        self.radioButton_3.setEnabled(toggle)
385        self.radioButton_4.setEnabled(toggle)
386        self.lineEdit_11.setEnabled(toggle and (not self._low_fit))
387
388    def lowFitAndFixToggle(self, toggle):
389        """
390        """
391        self._low_fit = toggle
392        toggle = not toggle
393        self.lineEdit_11.setEnabled(toggle)
394
395    def hiFitAndFixToggle(self, toggle):
396        """
397        """
398        self.lineEdit_13.setEnabled(toggle)
399
400    def highQToggle(self, clicked):
401        """
402        Disable/enable High Q extrapolation
403        """
404        self.radioButton_7.setEnabled(clicked)
405        self.radioButton_8.setEnabled(clicked)
406        self.lineEdit_12.setEnabled(clicked)
407        self.lineEdit_13.setEnabled(clicked)
408
409    def lowQToggle(self, clicked):
410        """
411        Disable/enable Low Q extrapolation
412        """
413        self.radioButton.setEnabled(clicked)
414        self.radioButton_2.setEnabled(clicked)
415        self.lineEdit_11.setEnabled(clicked and not self._low_fit)
416
417        # Enable subelements
418        self.radioButton_3.setEnabled(clicked and not self._low_guinier)
419        self.radioButton_4.setEnabled(clicked and not self._low_guinier)
420        self.lineEdit_10.setEnabled(clicked and not self._low_guinier)
421
422    def setupModel(self):
423
424        # filename
425        item = QtGui.QStandardItem(self._path)
426        self.model.setItem(WIDGETS.W_FILENAME, item)
427
428        # add Q parameters to the model
429        #qmin = min(self._data.x)
430        qmin = 0.0
431        item = QtGui.QStandardItem(str(qmin))
432        self.model.setItem(WIDGETS.W_QMIN, item)
433        qmax = 0.0
434        item = QtGui.QStandardItem(str(qmax))
435        self.model.setItem(WIDGETS.W_QMAX, item)
436
437        # add custom input params
438        item = QtGui.QStandardItem(str(self._background))
439        self.model.setItem(WIDGETS.W_BACKGROUND, item)
440        item = QtGui.QStandardItem(str(self._contrast))
441        self.model.setItem(WIDGETS.W_CONTRAST, item)
442        item = QtGui.QStandardItem(str(self._scale))
443        self.model.setItem(WIDGETS.W_SCALE, item)
444       
445        # Dialog elements
446        itemf = QtGui.QStandardItem("false")
447        self.model.setItem(WIDGETS.W_ENABLE_HIGHQ, itemf)
448        itemf = QtGui.QStandardItem("false")
449        self.model.setItem(WIDGETS.W_ENABLE_LOWQ, itemf)
450
451        item = QtGui.QStandardItem(str(self._npoints_low))
452        self.model.setItem(WIDGETS.W_NPTS_LOWQ, item)
453        item = QtGui.QStandardItem(str(self._npoints_high))
454        self.model.setItem(WIDGETS.W_NPTS_HIGHQ, item)
455
456        itemt = QtGui.QStandardItem("true")
457        self.model.setItem(WIDGETS.W_LOWQ_GUINIER, itemt)
458
459        itemt = QtGui.QStandardItem("true")
460        self.model.setItem(WIDGETS.W_LOWQ_FIT, itemt)
461        item = QtGui.QStandardItem(str(self._power_low))
462        self.model.setItem(WIDGETS.W_LOWQ_POWER_VALUE, item)
463
464        itemt = QtGui.QStandardItem("true")
465        self.model.setItem(WIDGETS.W_HIGHQ_FIT, itemt)
466        item = QtGui.QStandardItem(str(self._power_low))
467        self.model.setItem(WIDGETS.W_HIGHQ_POWER_VALUE, item)
468
469
470    def setupMapper(self):
471        # Set up the mapper.
472        self.mapper = QtGui.QDataWidgetMapper(self)
473        self.mapper.setOrientation(QtCore.Qt.Vertical)
474        self.mapper.setModel(self.model)
475
476        # Set up the view on the model for testing
477        # self.tableView.setModel(self.model)
478
479        # Filename
480        self.mapper.addMapping(self.lineEdit, WIDGETS.W_FILENAME)
481        # Qmin/Qmax
482        self.mapper.addMapping(self.lineEdit_2, WIDGETS.W_QMIN)
483        self.mapper.addMapping(self.lineEdit_3, WIDGETS.W_QMAX)
484
485        # Background
486        self.mapper.addMapping(self.lineEdit_4, WIDGETS.W_BACKGROUND)
487        # Scale
488        self.mapper.addMapping(self.lineEdit_5, WIDGETS.W_SCALE)
489        # Contrast
490        self.mapper.addMapping(self.lineEdit_6, WIDGETS.W_CONTRAST)
491
492        # Lowq/Highq items
493        self.mapper.addMapping(self.checkBox, WIDGETS.W_ENABLE_LOWQ)
494        self.mapper.addMapping(self.checkBox_2, WIDGETS.W_ENABLE_HIGHQ)
495
496        self.mapper.addMapping(self.lineEdit_10, WIDGETS.W_NPTS_LOWQ)
497        self.mapper.addMapping(self.radioButton, WIDGETS.W_LOWQ_GUINIER)
498
499        self.mapper.addMapping(self.radioButton_3, WIDGETS.W_LOWQ_FIT)
500        self.mapper.addMapping(self.lineEdit_11, WIDGETS.W_LOWQ_POWER_VALUE)
501
502        self.mapper.addMapping(self.radioButton_7, WIDGETS.W_HIGHQ_FIT)
503        self.mapper.addMapping(self.lineEdit_13, WIDGETS.W_HIGHQ_POWER_VALUE)
504   
505        # Output
506        self.mapper.addMapping(self.lineEdit_14, WIDGETS.W_VOLUME_FRACTION)
507        self.mapper.addMapping(self.lineEdit_15, WIDGETS.W_VOLUME_FRACTION_ERR)
508        self.mapper.addMapping(self.lineEdit_16, WIDGETS.W_SPECIFIC_SURFACE)
509        self.mapper.addMapping(self.lineEdit_17, WIDGETS.W_SPECIFIC_SURFACE_ERR)
510        self.mapper.addMapping(self.lineEdit_19, WIDGETS.W_INVARIANT)
511        self.mapper.addMapping(self.lineEdit_18, WIDGETS.W_INVARIANT_ERR)
512
513        self.mapper.toFirst()
514
515    def setData(self, data_item):
516        """
517        Obtain a QStandardItem object and dissect it to get Data1D/2D
518        Pass it over to the calculator
519        """
520        if not isinstance(data_item, list):
521            msg = "Incorrect type passed to the Invariant Perspective"
522            raise AttributeError, msg
523
524        if not isinstance(data_item[0], QtGui.QStandardItem):
525            msg = "Incorrect type passed to the Invariant Perspective"
526            raise AttributeError, msg
527
528        self._model_item = data_item[0]
529
530        # Extract data on 1st child - this is the Data1D/2D component
531        data = self._model_item.child(0).data().toPyObject()
532        self.model.item(WIDGETS.W_FILENAME).setData(QtCore.QVariant(self._model_item.text()))
533
534        ##### DEBUG ####
535        # set data in the debug tree view window
536        self.treeView.setModel(self.model)
537
538        self.calculate(data_list=[data])
539       
540    def calculate(self, data_list=None):
541        """
542        receive a list of data and compute invariant
543
544        TODO: pass warnings/messages to log
545        """
546        msg = ""
547        data = None
548        if data_list is None:
549            data_list = []
550        if len(data_list) >= 1:
551            if len(data_list) == 1:
552                data = data_list[0]
553            else:
554                data_1d_list = []
555                data_2d_list = []
556                error_msg = ""
557                # separate data into data1d and data2d list
558                for data in data_list:
559                    if data is not None:
560                        if issubclass(data.__class__, Data1D):
561                            data_1d_list.append(data)
562                        else:
563                            error_msg += " %s  type %s \n" % (str(data.name),
564                                                              str(data.__class__.__name__))
565                            data_2d_list.append(data)
566                if len(data_2d_list) > 0:
567                    msg = "Invariant does not support the following data types:\n"
568                    msg += error_msg
569                if len(data_1d_list) == 0:
570                    # remake this as a qt event
571                    #wx.PostEvent(self.parent, StatusEvent(status=msg, info='error'))
572                    return
573
574                # TODO: add msgbox for data choice
575                #msg += "Invariant panel does not allow multiple data!\n"
576                #msg += "Please select one.\n"
577                #if len(data_list) > 1:
578                    #from invariant_widgets import DataDialog
579                    #dlg = DataDialog(data_list=data_1d_list, text=msg)
580                    #if dlg.ShowModal() == wx.ID_OK:
581                    #    data = dlg.get_data()
582                    #else:
583                    #    data = None
584                    #dlg.Destroy()
585
586            if data is None:
587                msg += "invariant receives no data. \n"
588                #wx.PostEvent(self.parent, StatusEvent(status=msg, info='error'))
589                return
590            if not issubclass(data.__class__, Data1D):
591                msg += "invariant cannot be computed for data of "
592                msg += "type %s\n" % (data.__class__.__name__)
593                #wx.PostEvent(self.parent, StatusEvent(status=msg, info='error'))
594                return
595            else:
596                #wx.PostEvent(self.parent, NewPlotEvent(plot=data, title=data.title))
597                try:
598                    self._data = data
599                    self._path = "unique path"
600                    self.calculateInvariant()
601                except:
602                    msg = "Invariant Set_data: " + str(sys.exc_value)
603                    #wx.PostEvent(self.parent, StatusEvent(status=msg, info="error"))
604        else:
605            msg = "invariant cannot be computed for data of "
606            msg += "type %s" % (data.__class__.__name__)
607            #wx.PostEvent(self.parent, StatusEvent(status=msg, info='error'))
608
609    def allowBatch(self):
610        """
611        Tell the caller that we don't accept multiple data instances
612        """
613        return False
614
615if __name__ == "__main__":
616    app = QtGui.QApplication([])
617    import qt4reactor
618    qt4reactor.install()
619    # DO NOT move the following import to the top!
620    # (unless you know what you're doing)
621    from twisted.internet import reactor
622    dlg = InvariantWindow(reactor)
623    dlg.show()
624    reactor.run()
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