Source code for sas.qtgui.Perspectives.Fitting.FittingOptions

# global
import sys
import os
import types
import webbrowser

from PyQt5 import QtCore
from PyQt5 import QtGui
from PyQt5 import QtWidgets

from sas.qtgui.UI import images_rc
from sas.qtgui.UI import main_resources_rc
import sas.qtgui.Utilities.GuiUtils as GuiUtils

from bumps import fitters
import bumps.options

from sas.qtgui.Perspectives.Fitting.UI.FittingOptionsUI import Ui_FittingOptions

# Set the default optimizer
fitters.FIT_DEFAULT_ID = 'lm'


[docs]class FittingOptions(QtWidgets.QDialog, Ui_FittingOptions): """ Hard-coded version of the fit options dialog available from BUMPS. This should be make more "dynamic". bumps.options.FIT_FIELDS gives mapping between parameter names, parameter strings and field type (double line edit, integer line edit, combo box etc.), e.g.:: FIT_FIELDS = dict( samples = ("Samples", parse_int), xtol = ("x tolerance", float), ) bumps.fitters.<algorithm>.settings gives mapping between algorithm, parameter name and default value, e.g.:: >>> settings = [('steps', 1000), ('starts', 1), ('radius', 0.15), ('xtol', 1e-6), ('ftol', 1e-8)] """ fit_option_changed = QtCore.pyqtSignal(str) def __init__(self, parent=None, config=None): super(FittingOptions, self).__init__(parent) self.setupUi(self) # disable the context help icon self.setWindowFlags(self.windowFlags() & ~QtCore.Qt.WindowContextHelpButtonHint) self.config = config # no reason to have this widget resizable self.setFixedSize(self.minimumSizeHint()) self.setWindowTitle("Fit Algorithms") # Fill up the algorithm combo, based on what BUMPS says is available self.cbAlgorithm.addItems([n.name for n in fitters.FITTERS if n.id in fitters.FIT_ACTIVE_IDS]) # Handle the Apply button click self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok).clicked.connect(self.onApply) # handle the Help button click self.buttonBox.button(QtWidgets.QDialogButtonBox.Help).clicked.connect(self.onHelp) # Handle the combo box changes self.cbAlgorithm.currentIndexChanged.connect(self.onAlgorithmChange) # Set the default index default_name = [n.name for n in fitters.FITTERS if n.id == fitters.FIT_DEFAULT_ID][0] default_index = self.cbAlgorithm.findText(default_name) self.cbAlgorithm.setCurrentIndex(default_index) # previous algorithm choice self.previous_index = default_index # Assign appropriate validators self.assignValidators() # Set defaults self.current_fitter_id = fitters.FIT_DEFAULT_ID # OK has to be initialized to True, after initial validator setup self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok).setEnabled(True)
[docs] def assignValidators(self): """ Use options.FIT_FIELDS to assert which line edit gets what validator """ for option in bumps.options.FIT_FIELDS.keys(): (f_name, f_type) = bumps.options.FIT_FIELDS[option] validator = None if type(f_type) == types.FunctionType: validator = QtGui.QIntValidator() validator.setBottom(0) elif f_type == float: validator = GuiUtils.DoubleValidator() validator.setBottom(0) else: continue for fitter_id in fitters.FIT_ACTIVE_IDS: line_edit = self.widgetFromOption(str(option), current_fitter=str(fitter_id)) if hasattr(line_edit, 'setValidator') and validator is not None: line_edit.setValidator(validator) line_edit.textChanged.connect(self.check_state) line_edit.textChanged.emit(line_edit.text())
[docs] def check_state(self, *args, **kwargs): sender = self.sender() validator = sender.validator() state = validator.validate(sender.text(), 0)[0] if state == QtGui.QValidator.Acceptable: color = '' # default self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok).setEnabled(True) else: color = '#fff79a' # yellow self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok).setEnabled(False) sender.setStyleSheet('QLineEdit { background-color: %s }' % color)
[docs] def onAlgorithmChange(self, index): """ Change the page in response to combo box index """ # Find the algorithm ID from name self.current_fitter_id = \ [n.id for n in fitters.FITTERS if n.name == str(self.cbAlgorithm.currentText())][0] # find the right stacked widget widget_name = "self.page_"+str(self.current_fitter_id) # Convert the name into widget instance try: widget_to_activate = eval(widget_name) except AttributeError: # We don't yet have this optimizer. # Show message msg = "This algorithm has not yet been implemented in SasView.\n" msg += "Please choose a different algorithm" QtWidgets.QMessageBox.warning(self, 'Warning', msg, QtWidgets.QMessageBox.Ok) # Move the index to previous position self.cbAlgorithm.setCurrentIndex(self.previous_index) return index_for_this_id = self.stackedWidget.indexOf(widget_to_activate) # Select the requested widget self.stackedWidget.setCurrentIndex(index_for_this_id) self.updateWidgetFromBumps(self.current_fitter_id) self.assignValidators() # OK has to be reinitialized to True self.buttonBox.button(QtWidgets.QDialogButtonBox.Ok).setEnabled(True) # keep reference self.previous_index = index
[docs] def onApply(self): """ Update the fitter object """ options = self.config.values[self.current_fitter_id] for option in options.keys(): # Find the widget name of the option # e.g. 'samples' for 'dream' is 'self.samples_dream' widget_name = 'self.'+option+'_'+self.current_fitter_id try: line_edit = eval(widget_name) except AttributeError: # Skip bumps monitors continue if line_edit is None or not isinstance(line_edit, QtWidgets.QLineEdit): continue color = line_edit.palette().color(QtGui.QPalette.Background).name() if color == '#fff79a': # Show a custom tooltip and return tooltip = "<html><b>Please enter valid values in all fields.</html>" QtWidgets.QToolTip.showText(line_edit.mapToGlobal( QtCore.QPoint(line_edit.rect().right(), line_edit.rect().bottom() + 2)), tooltip) return # Notify the perspective, so the window title is updated self.fit_option_changed.emit(self.cbAlgorithm.currentText()) def bumpsUpdate(option): """ Utility method for bumps state update """ widget = self.widgetFromOption(option) if widget is None: return try: if isinstance(widget, QtWidgets.QComboBox): new_value = widget.currentText() else: try: new_value = int(widget.text()) except ValueError: new_value = float(widget.text()) #new_value = widget.currentText() if isinstance(widget, QtWidgets.QComboBox) \ # else float(widget.text()) self.config.values[self.current_fitter_id][option] = new_value except ValueError: # Don't update bumps if widget has bad data self.reject # Update the BUMPS singleton [bumpsUpdate(o) for o in self.config.values[self.current_fitter_id].keys()] self.close()
[docs] def onHelp(self): """ Show the "Fitting options" section of help """ tree_location = GuiUtils.HELP_DIRECTORY_LOCATION tree_location += "/user/qtgui/Perspectives/Fitting/" # Actual file anchor will depend on the combo box index # Note that we can be clusmy here, since bad current_fitter_id # will just make the page displayed from the top helpfile = "optimizer.html#fit-" + self.current_fitter_id help_location = tree_location + helpfile webbrowser.open('file://' + os.path.realpath(help_location))
[docs] def widgetFromOption(self, option_id, current_fitter=None): """ returns widget's element linked to the given option_id """ if current_fitter is None: current_fitter = self.current_fitter_id if option_id not in list(bumps.options.FIT_FIELDS.keys()): return None option = option_id + '_' + current_fitter if not hasattr(self, option): return None return eval('self.' + option)
[docs] def getResults(self): """ Sends back the current choice of parameters """ algorithm = self.cbAlgorithm.currentText() return algorithm
[docs] def updateWidgetFromBumps(self, fitter_id): """ Given the ID of the current optimizer, fetch the values and update the widget """ options = self.config.values[fitter_id] for option in options.keys(): # Find the widget name of the option # e.g. 'samples' for 'dream' is 'self.samples_dream' widget_name = 'self.'+option+'_'+fitter_id if option not in bumps.options.FIT_FIELDS: return if isinstance(bumps.options.FIT_FIELDS[option][1], bumps.options.ChoiceList): control = eval(widget_name) control.setCurrentIndex(control.findText(str(options[option]))) else: eval(widget_name).setText(str(options[option])) pass