wizard/BModulePage.py

   1 #!/usr/bin/env python
   2 # encoding: utf-8
   3 #
   4 # This file is part of BeRTOS.
   5 #
   6 # Bertos is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19 #
  20 # As a special exception, you may use this file as part of a free software
  21 # library without restriction.  Specifically, if other files instantiate
  22 # templates or use macros or inline functions from this file, or you compile
  23 # this file and link it with other files to produce an executable, this
  24 # file does not by itself cause the resulting executable to be covered by
  25 # the GNU General Public License.  This exception does not however
  26 # invalidate any other reasons why the executable file might be covered by
  27 # the GNU General Public License.
  28 #
  29 # Copyright 2008 Develer S.r.l. (http://www.develer.com/)
  30 #
  31 # $Id$
  32 #
  33 # Author: Lorenzo Berni <duplo@develer.com>
  34 #
  35
  36 import os
  37
  38 from PyQt4.QtGui import *
  39 from BWizardPage import *
  40 import bertos_utils
  41
  42 from bertos_utils import SupportedException
  43 from DefineException import *
  44 from const import *
  45
  46 class BModulePage(BWizardPage):
  47     """
  48     Page of the wizard that permits to select and configurate the BeRTOS modules.
  49     """
  50
  51     def __init__(self):
  52         BWizardPage.__init__(self, UI_LOCATION + "/module_select.ui")
  53         self.setTitle(self.tr("Configure the BeRTOS modules"))
  54         self._control_group = QControlGroup()
  55         ## special connection needed for the QControlGroup
  56         self.connect(self._control_group, SIGNAL("stateChanged"), self.saveValue)
  57
  58     ## Overloaded BWizardPage methods ##
  59
  60     def setupUi(self):
  61         """
  62         Overload of BWizardPage setupUi method.
  63         """
  64         self.pageContent.moduleTree.clear()
  65         self.pageContent.moduleTree.setHeaderHidden(True)
  66         self.pageContent.propertyTable.horizontalHeader().setResizeMode(QHeaderView.Stretch)
  67         self.pageContent.propertyTable.horizontalHeader().setVisible(False)
  68         self.pageContent.propertyTable.verticalHeader().setResizeMode(QHeaderView.ResizeToContents)
  69         self.pageContent.propertyTable.verticalHeader().setVisible(False)
  70         self.pageContent.propertyTable.setColumnCount(2)
  71         self.pageContent.propertyTable.setRowCount(0)
  72         self.pageContent.moduleLabel.setVisible(False)
  73         self.pageContent.warningLabel.setVisible(False)
  74
  75     def connectSignals(self):
  76         """
  77         Overload of the BWizardPage connectSignals method.
  78         """
  79         self.connect(self.pageContent.moduleTree, SIGNAL("itemPressed(QTreeWidgetItem*, int)"), self.fillPropertyTable)
  80         self.connect(self.pageContent.moduleTree, SIGNAL("itemPressed(QTreeWidgetItem*, int)"), self.moduleClicked)
  81         self.connect(self.pageContent.moduleTree, SIGNAL("itemChanged(QTreeWidgetItem*, int)"), self.dependencyCheck)
  82         self.connect(self.pageContent.propertyTable, SIGNAL("itemSelectionChanged()"), self.showPropertyDescription)
  83
  84     def reloadData(self):
  85         """
  86         Overload of the BWizardPage reloadData method.
  87         """
  88         QApplication.instance().setOverrideCursor(Qt.WaitCursor)
  89         self.setupUi()
  90         self.loadModuleData()
  91         self.fillModuleTree()
  92         QApplication.instance().restoreOverrideCursor()
  93
  94     ####
  95
  96     ## Slots ##
  97
  98     def moduleClicked(self, item, column):
  99         self.setBold(item, False)
 100
 101     def fillPropertyTable(self):
 102         """
 103         Slot called when the user selects a module from the module tree.
 104         Fills the property table using the configuration parameters defined in
 105         the source tree.
 106         """
 107         module = self.currentModule()
 108         if module:
 109             try:
 110                 supported = bertos_utils.isSupported(self.project(), module=module)
 111             except SupportedException, e:
 112                 self.exceptionOccurred(self.tr("Error evaluating \"%1\" for module %2").arg(e.support_string).arg(module))
 113                 supported = True
 114             self._control_group.clear()
 115             configuration = self.projectInfo("MODULES")[module]["configuration"]
 116             module_description = self.projectInfo("MODULES")[module]["description"]
 117             self.pageContent.moduleLabel.setText(module_description)
 118             self.pageContent.moduleLabel.setVisible(True)
 119             if not supported:
 120                 self.pageContent.warningLabel.setVisible(True)
 121                 selected_cpu = self.projectInfo("CPU_NAME")
 122                 self.pageContent.warningLabel.setText(self.tr("<font color='#FF0000'>Warning: the selected module, \
 123                     is not completely supported by the %1.</font>").arg(selected_cpu))
 124             else:
 125                 self.pageContent.warningLabel.setVisible(False)
 126             self.pageContent.propertyTable.clear()
 127             self.pageContent.propertyTable.setRowCount(0)
 128             if configuration != "":
 129                 configurations = self.projectInfo("CONFIGURATIONS")[configuration]
 130                 param_list = sorted(configurations["paramlist"])
 131                 index = 0
 132                 for i, property in param_list:
 133                     if "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "autoenabled":
 134                         # Doesn't show the hidden fields
 135                         continue
 136                     try:
 137                         param_supported = bertos_utils.isSupported(self.project(), property_id=(configuration, property))
 138                     except SupportedException, e:
 139                         self.exceptionOccurred(self.tr("Error evaluating \"%1\" for parameter %2").arg(e.support_string).arg(property))
 140                         param_supported = True
 141                     if not param_supported:
 142                         # Doesn't show the unsupported parameters
 143                         continue
 144                     # Set the row count to the current index + 1
 145                     self.pageContent.propertyTable.setRowCount(index + 1)
 146                     item = QTableWidgetItem(configurations[property]["brief"])
 147                     item.setData(Qt.UserRole, qvariant_converter.convertString(property))
 148                     self.pageContent.propertyTable.setItem(index, 0, item)
 149                     if "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "boolean":
 150                         self.insertCheckBox(index, configurations[property]["value"])
 151                     elif "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "enum":
 152                         self.insertComboBox(index, configurations[property]["value"], configurations[property]["informations"]["value_list"])
 153                     elif "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "int":
 154                         self.insertSpinBox(index, configurations[property]["value"], configurations[property]["informations"])
 155                     else:
 156                         # Not defined type, rendered as a text field
 157                         self.pageContent.propertyTable.setItem(index, 1, QTableWidgetItem(configurations[property]["value"]))
 158                     index += 1
 159             if self.pageContent.propertyTable.rowCount() == 0:
 160                 module_label = self.pageContent.moduleLabel.text()
 161                 module_label += "\n\nNo configuration needed."
 162                 self.pageContent.moduleLabel.setText(module_label)
 163         else:
 164             self.pageContent.moduleLabel.setText("")
 165             self.pageContent.moduleLabel.setVisible(False)
 166             self.pageContent.propertyTable.clear()
 167             self.pageContent.propertyTable.setRowCount(0)
 168
 169     def dependencyCheck(self, item):
 170         """
 171         Checks the dependencies of the module associated with the given item.
 172         """
 173         checked = False
 174         module = unicode(item.text(0))
 175         if item.checkState(0) == Qt.Checked:
 176             self.moduleSelected(module)
 177         else:
 178             self.moduleUnselected(module)
 179             self.removeFileDependencies(module)
 180
 181     def showPropertyDescription(self):
 182         """
 183         Slot called when the property selection changes. Shows the description
 184         of the selected property.
 185         """
 186         self.resetPropertyDescription()
 187         configurations = self.currentModuleConfigurations()
 188         if self.currentProperty() in configurations:
 189             description = configurations[self.currentProperty()]["brief"]
 190             name = self.currentProperty()
 191             self.currentPropertyItem().setText(description + "\n" + name)
 192
 193     def saveValue(self, index):
 194         """
 195         Slot called when the user modifies one of the configuration parameters.
 196         It stores the new value."""
 197         property = qvariant_converter.getString(self.pageContent.propertyTable.item(index, 0).data(Qt.UserRole))
 198         configuration = self.projectInfo("MODULES")[self.currentModule()]["configuration"]
 199         configurations = self.projectInfo("CONFIGURATIONS")
 200         if "type" not in configurations[configuration][property]["informations"] or configurations[configuration][property]["informations"]["type"] == "int":
 201             configurations[configuration][property]["value"] = unicode(int(self.pageContent.propertyTable.cellWidget(index, 1).value()))
 202         elif configurations[configuration][property]["informations"]["type"] == "enum":
 203             configurations[configuration][property]["value"] = unicode(self.pageContent.propertyTable.cellWidget(index, 1).currentText())
 204         elif configurations[configuration][property]["informations"]["type"] == "boolean":
 205             if self.pageContent.propertyTable.cellWidget(index, 1).isChecked():
 206                 configurations[configuration][property]["value"] = "1"
 207             else:
 208                 configurations[configuration][property]["value"] = "0"
 209         self.setProjectInfo("CONFIGURATIONS", configurations)
 210         if self.moduleItem(self.currentModule()).checkState(0) == Qt.Checked:
 211             self.dependencyCheck(self.moduleItem(self.currentModule()))
 212
 213     ####
 214
 215     def loadModuleData(self):
 216         """
 217         Loads the module data.
 218         """
 219         # Load the module data only if it isn't already loaded
 220         if not self.projectInfo("MODULES") \
 221                 and not self.projectInfo("LISTS") \
 222                 and not self.projectInfo("CONFIGURATIONS"):
 223             try:
 224                 bertos_utils.loadModuleData(self.project())
 225             except ModuleDefineException, e:
 226                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 227             except EnumDefineException, e:
 228                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 229             except ConfigurationDefineException, e:
 230                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 231
 232     def fillModuleTree(self):
 233         """
 234         Fills the module tree with the module entries separated in categories.
 235         """
 236         self.pageContent.moduleTree.clear()
 237         modules = self.projectInfo("MODULES")
 238         if not modules:
 239             return
 240         categories = {}
 241         for module, information in modules.items():
 242             if information["category"] not in categories:
 243                 categories[information["category"]] = []
 244             categories[information["category"]].append(module)
 245         for category, module_list in categories.items():
 246             item = QTreeWidgetItem(QStringList([category]))
 247             for module in module_list:
 248                 enabled = modules[module]["enabled"]
 249                 module_item = QTreeWidgetItem(item, QStringList([module]))
 250                 try:
 251                     supported = bertos_utils.isSupported(self.project(), module=module)
 252                 except SupportedException, e:
 253                     self.exceptionOccurred(self.tr("Error evaluating \"%1\" for module %2").arg(e.support_string).arg(module))
 254                     supported = True
 255                 if not supported:
 256                     module_item.setForeground(0, QBrush(QColor(Qt.red)))
 257                 if enabled:
 258                     module_item.setCheckState(0, Qt.Checked)
 259                 else:
 260                     module_item.setCheckState(0, Qt.Unchecked)
 261             self.pageContent.moduleTree.addTopLevelItem(item)
 262         self.pageContent.moduleTree.sortItems(0, Qt.AscendingOrder)
 263         self.fillPropertyTable()
 264
 265     def insertCheckBox(self, index, value):
 266         """
 267         Inserts in the table at index a checkbox for a boolean property setted
 268         to value.
 269         """
 270         check_box = QCheckBox()
 271         self.pageContent.propertyTable.setCellWidget(index, 1, check_box)
 272         if value == "1":
 273             check_box.setChecked(True)
 274         else:
 275             check_box.setChecked(False)
 276         self._control_group.addControl(index, check_box)
 277
 278     def insertComboBox(self, index, value, value_list):
 279         """
 280         Inserts in the table at index a combobox for an enum property setted
 281         to value.
 282         """
 283         try:
 284             enum = self.projectInfo("LISTS")[value_list]
 285             combo_box = QComboBox()
 286             self.pageContent.propertyTable.setCellWidget(index, 1, combo_box)
 287             for i, element in enumerate(enum):
 288                 combo_box.addItem(element)
 289                 if element == value:
 290                     combo_box.setCurrentIndex(i)
 291             self._control_group.addControl(index, combo_box)
 292         except KeyError:
 293             self.exceptionOccurred(self.tr("Define list \"%1\" not found. Check definition files.").arg(value_list))
 294             self.pageContent.propertyTable.setItem(index, 1, QTableWidgetItem(value))
 295
 296     def insertSpinBox(self, index, value, informations):
 297         """
 298         Inserts in the table at index a spinbox for an int, a long or an unsigned
 299         long property setted to value.
 300         """
 301         # int, long or undefined type property
 302         spin_box = None
 303         if bertos_utils.isLong(informations) or bertos_utils.isUnsignedLong(informations):
 304             spin_box = QDoubleSpinBox()
 305             spin_box.setDecimals(0)
 306         else:
 307             spin_box = QSpinBox()
 308         self.pageContent.propertyTable.setCellWidget(index, 1, spin_box)
 309         minimum = -32768
 310         maximum = 32767
 311         suff = ""
 312         if bertos_utils.isLong(informations):
 313             minimum = -2147483648
 314             maximum = 2147483647
 315             suff = "L"
 316         elif bertos_utils.isUnsigned(informations):
 317             minimum = 0
 318             maximum = 65535
 319             suff = "U"
 320         elif bertos_utils.isUnsignedLong(informations):
 321             minimum = 0
 322             maximum = 4294967295
 323             suff = "UL"
 324         if "min" in informations:
 325             minimum = int(informations["min"])
 326         if "max" in informations:
 327             maximum = int(informations["max"])
 328         spin_box.setRange(minimum, maximum)
 329         spin_box.setSuffix(suff)
 330         spin_box.setValue(int(value.replace("L", "").replace("U", "")))
 331         self._control_group.addControl(index, spin_box)
 332
 333
 334     def currentModule(self):
 335         """
 336         Retuns the current module name.
 337         """
 338         current_module = self.pageContent.moduleTree.currentItem()
 339         # return only the child items
 340         if current_module and current_module.parent():
 341             return unicode(current_module.text(0))
 342         else:
 343             return None
 344
 345     def moduleItem(self, module):
 346         for top_level_index in range(self.pageContent.moduleTree.topLevelItemCount()):
 347             top_level_item = self.pageContent.moduleTree.topLevelItem(top_level_index)
 348             for child_index in range(top_level_item.childCount()):
 349                 child_item = top_level_item.child(child_index)
 350                 if unicode(child_item.text(0)) == module:
 351                     return child_item
 352         return None
 353
 354     def currentModuleConfigurations(self):
 355         """
 356         Returns the current module configuration.
 357         """
 358         return self.configurations(self.currentModule())
 359
 360     def currentProperty(self):
 361         """
 362         Rerturns the current property from the property table.
 363         """
 364         return qvariant_converter.getString(self.pageContent.propertyTable.item(self.pageContent.propertyTable.currentRow(), 0).data(Qt.UserRole))
 365
 366     def currentPropertyItem(self):
 367         """
 368         Returns the QTableWidgetItem of the current property.
 369         """
 370         return self.pageContent.propertyTable.item(self.pageContent.propertyTable.currentRow(), 0)
 371
 372     def configurations(self, module):
 373         """
 374         Returns the configuration for the selected module.
 375         """
 376         configuration = self.projectInfo("MODULES")[module]["configuration"]
 377         if len(configuration) > 0:
 378             return self.projectInfo("CONFIGURATIONS")[configuration]
 379         else:
 380             return {}
 381
 382     def resetPropertyDescription(self):
 383         """
 384         Resets the label for each property table entry.
 385         """
 386         for index in range(self.pageContent.propertyTable.rowCount()):
 387             property_name = qvariant_converter.getString(self.pageContent.propertyTable.item(index, 0).data(Qt.UserRole))
 388             # Awful solution! Needed because if the user change the module, the selection changed...
 389             if property_name not in self.currentModuleConfigurations():
 390                 break
 391             self.pageContent.propertyTable.item(index, 0).setText(self.currentModuleConfigurations()[property_name]['brief'])
 392
 393     def setBold(self, item, bold):
 394         self.pageContent.moduleTree.blockSignals(True)
 395         font = item.font(0)
 396         font.setBold(bold)
 397         item.setFont(0, font)
 398         self.pageContent.moduleTree.blockSignals(False)
 399
 400     def moduleSelected(self, selectedModule):
 401         """
 402         Resolves the selection dependencies.
 403         """
 404         modules = self.projectInfo("MODULES")
 405         modules[selectedModule]["enabled"] = True
 406         self.setProjectInfo("MODULES", modules)
 407         depends = self.projectInfo("MODULES")[selectedModule]["depends"]
 408         unsatisfied = []
 409         if self.pageContent.automaticFix.isChecked():
 410             unsatisfied = self.selectDependencyCheck(selectedModule)
 411         if len(unsatisfied) > 0:
 412             for module in unsatisfied:
 413                 modules = self.projectInfo("MODULES")
 414                 modules[module]["enabled"] = True
 415             for category in range(self.pageContent.moduleTree.topLevelItemCount()):
 416                 item = self.pageContent.moduleTree.topLevelItem(category)
 417                 for child in range(item.childCount()):
 418                     if unicode(item.child(child).text(0)) in unsatisfied:
 419                         self.setBold(item.child(child), True)
 420                         self.setBold(item, True)
 421                         item.child(child).setCheckState(0, Qt.Checked)
 422
 423     def moduleUnselected(self, unselectedModule):
 424         """
 425         Resolves the unselection dependencies.
 426         """
 427         modules = self.projectInfo("MODULES")
 428         modules[unselectedModule]["enabled"] = False
 429         self.setProjectInfo("MODULES", modules)
 430         unsatisfied = []
 431         unsatisfied_params = []
 432         if self.pageContent.automaticFix.isChecked():
 433             unsatisfied, unsatisfied_params = self.unselectDependencyCheck(unselectedModule)
 434         if len(unsatisfied) > 0 or len(unsatisfied_params) > 0:
 435             message = []
 436             heading = self.tr("The module %1 is needed by").arg(unselectedModule)
 437             message.append(heading)
 438             module_list = ", ".join(unsatisfied)
 439             param_list = ", ".join(["%s (%s)" %(param_name, module) for module, param_name in unsatisfied_params])
 440             if module_list:
 441                 message.append(QString(module_list))
 442             if module_list and param_list:
 443                 message.append(self.tr("and by"))
 444             if param_list:
 445                 message.append(QString(param_list))
 446             message_str = QStringList(message).join(" ")
 447             message_str.append(self.tr("\n\nDo you want to automatically fix these conflicts?"))
 448             choice = QMessageBox.warning(self, self.tr("Dependency error"), message_str, QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
 449             if choice == QMessageBox.Yes:
 450                 for module in unsatisfied:
 451                     modules = self.projectInfo("MODULES")
 452                     modules[module]["enabled"] = False
 453                 for category in range(self.pageContent.moduleTree.topLevelItemCount()):
 454                     item = self.pageContent.moduleTree.topLevelItem(category)
 455                     for child in range(item.childCount()):
 456                         if unicode(item.child(child).text(0)) in unsatisfied:
 457                             item.child(child).setCheckState(0, Qt.Unchecked)
 458                 for module, param in unsatisfied_params:
 459                     configuration_file = self.projectInfo("MODULES")[module]["configuration"]
 460                     configurations = self.projectInfo("CONFIGURATIONS")
 461                     configurations[configuration_file][param]["value"] = "0"
 462                     self.setProjectInfo("CONFIGURATIONS", configurations)
 463
 464     def selectDependencyCheck(self, module):
 465         """
 466         Returns the list of unsatisfied dependencies after a selection.
 467         """
 468         unsatisfied = set()
 469         modules = self.projectInfo("MODULES")
 470         files = self.projectInfo("FILES")
 471         configurations = self.projectInfo("CONFIGURATIONS").get(modules[module]["configuration"], {"paramlist": ()})
 472         conditional_deps = ()
 473         for i, param_name in configurations["paramlist"]:
 474             information = configurations[param_name]
 475             if information["informations"]["type"] == "boolean" and \
 476                 information["value"] != "0" and \
 477                 "conditional_deps" in information["informations"]:
 478
 479                 conditional_deps += information["informations"]["conditional_deps"]
 480
 481         for dependency in modules[module]["depends"] + conditional_deps:
 482             if dependency in modules and not modules[dependency]["enabled"]:
 483                 unsatisfied |= set([dependency])
 484                 if dependency not in unsatisfied:
 485                     unsatisfied |= self.selectDependencyCheck(dependency)
 486             if dependency not in modules:
 487                 if dependency in files:
 488                     files[dependency] += 1
 489                 else:
 490                     files[dependency] = 1
 491         self.setProjectInfo("FILES", files)
 492         return unsatisfied
 493
 494     def unselectDependencyCheck(self, dependency):
 495         """
 496         Returns the list of unsatisfied dependencies after an unselection.
 497         """
 498         unsatisfied = set()
 499         unsatisfied_params = set()
 500         modules = self.projectInfo("MODULES")
 501         for module, informations in modules.items():
 502             configurations = self.projectInfo("CONFIGURATIONS").get(informations["configuration"], {"paramlist": ()})
 503             conditional_deps = {}
 504             for i, param_name in configurations["paramlist"]:
 505                 information = configurations[param_name]
 506                 if information["informations"]["type"] == "boolean" and information["value"] != "0" and "conditional_deps" in information["informations"]:
 507                     for dep in information["informations"]["conditional_deps"]:
 508                         if not dep in conditional_deps:
 509                             conditional_deps[dep] = []
 510                         conditional_deps[dep].append((module, param_name))
 511             if dependency in informations["depends"] and informations["enabled"]:
 512                 unsatisfied |= set([module])
 513                 if dependency not in unsatisfied:
 514                     tmp = self.unselectDependencyCheck(module)
 515                     unsatisfied |= tmp[0]
 516                     unsatisfied_params |= tmp[1]
 517             if dependency in conditional_deps:
 518                 unsatisfied_params |= set(conditional_deps[dependency])
 519         return unsatisfied, unsatisfied_params
 520
 521     def removeFileDependencies(self, module):
 522         """
 523         Removes the files dependencies of the given module.
 524         """
 525         modules = self.projectInfo("MODULES")
 526         files = self.projectInfo("FILES")
 527         dependencies = modules[module]["depends"]
 528         for dependency in dependencies:
 529             if dependency in files:
 530                 files[dependency] -= 1
 531                 if files[dependency] == 0:
 532                     del files[dependency]
 533         self.setProjectInfo("FILES", files)
 534
 535 class QControlGroup(QObject):
 536     """
 537     Simple class that permit to connect different signals of different widgets
 538     with a slot that emit a signal. Permits to group widget and to understand which of
 539     them has sent the signal.
 540     """
 541
 542     def __init__(self):
 543         QObject.__init__(self)
 544         self._controls = {}
 545
 546     def addControl(self, id, control):
 547         """
 548         Add a control.
 549         """
 550         self._controls[id] = control
 551         if type(control) == QCheckBox:
 552             self.connect(control, SIGNAL("stateChanged(int)"), lambda: self.stateChanged(id))
 553         elif type(control) == QSpinBox:
 554             self.connect(control, SIGNAL("valueChanged(int)"), lambda: self.stateChanged(id))
 555         elif type(control) == QComboBox:
 556             self.connect(control, SIGNAL("currentIndexChanged(int)"), lambda: self.stateChanged(id))
 557         elif type(control) == QDoubleSpinBox:
 558             self.connect(control, SIGNAL("valueChanged(double)"), lambda: self.stateChanged(id))
 559
 560     def clear(self):
 561         """
 562         Remove all the controls.
 563         """
 564         self._controls = {}
 565
 566     def stateChanged(self, id):
 567         """
 568         Slot called when the value of one of the stored widget changes. It emits
 569         another signal.
 570         """
 571         self.emit(SIGNAL("stateChanged"), id)