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.QtCore import *
  39 from PyQt4.QtGui import *
  40 from BWizardPage import *
  41 import bertos_utils
  42
  43 from bertos_utils import SupportedException
  44 from DefineException import *
  45 from const import *
  46
  47 class BModulePage(BWizardPage):
  48     """
  49     Page of the wizard that permits to select and configurate the BeRTOS modules.
  50     """
  51
  52     def __init__(self):
  53         BWizardPage.__init__(self, UI_LOCATION + "/module_select.ui")
  54         self.setTitle(self.tr("Configure the BeRTOS modules"))
  55         self._control_group = QControlGroup()
  56         ## special connection needed for the QControlGroup
  57         self.connect(self._control_group, SIGNAL("stateChanged"), self.saveValue)
  58
  59     ## Overloaded BWizardPage methods ##
  60
  61     def setupUi(self):
  62         """
  63         Overload of BWizardPage setupUi method.
  64         """
  65         self.pageContent.moduleTree.clear()
  66         self.pageContent.moduleTree.setHeaderHidden(True)
  67         self.pageContent.propertyTable.horizontalHeader().setResizeMode(QHeaderView.Stretch)
  68         self.pageContent.propertyTable.horizontalHeader().setVisible(False)
  69         self.pageContent.propertyTable.verticalHeader().setResizeMode(QHeaderView.ResizeToContents)
  70         self.pageContent.propertyTable.verticalHeader().setVisible(False)
  71         self.pageContent.propertyTable.setColumnCount(2)
  72         self.pageContent.propertyTable.setRowCount(0)
  73         self.pageContent.moduleLabel.setVisible(False)
  74         self.pageContent.warningLabel.setVisible(False)
  75
  76     def connectSignals(self):
  77         """
  78         Overload of the BWizardPage connectSignals method.
  79         """
  80         self.connect(self.pageContent.moduleTree, SIGNAL("itemPressed(QTreeWidgetItem*, int)"), self.fillPropertyTable)
  81         self.connect(self.pageContent.moduleTree, SIGNAL("itemPressed(QTreeWidgetItem*, int)"), self.moduleClicked)
  82         self.connect(self.pageContent.moduleTree, SIGNAL("itemChanged(QTreeWidgetItem*, int)"), self.dependencyCheck)
  83         self.connect(self.pageContent.propertyTable, SIGNAL("itemSelectionChanged()"), self.showPropertyDescription)
  84
  85     def reloadData(self):
  86         """
  87         Overload of the BWizardPage reloadData method.
  88         """
  89         QApplication.instance().setOverrideCursor(Qt.WaitCursor)
  90         self.setupUi()
  91         self.loadModuleData()
  92         self.fillModuleTree()
  93         QApplication.instance().restoreOverrideCursor()
  94
  95     ####
  96
  97     ## Slots ##
  98
  99     def moduleClicked(self, item, column):
 100         self.setBold(item, False)
 101
 102     def fillPropertyTable(self):
 103         """
 104         Slot called when the user selects a module from the module tree.
 105         Fills the property table using the configuration parameters defined in
 106         the source tree.
 107         """
 108         module = self.currentModule()
 109         if module:
 110             try:
 111                 supported = bertos_utils.isSupported(self.project(), module=module)
 112             except SupportedException, e:
 113                 self.exceptionOccurred(self.tr("Error evaluating \"%1\" for module %2").arg(e.support_string).arg(module))
 114                 supported = True
 115             self._control_group.clear()
 116             configuration = self.projectInfo("MODULES")[module]["configuration"]
 117             module_description = self.projectInfo("MODULES")[module]["description"]
 118             self.pageContent.moduleLabel.setText(module_description)
 119             self.pageContent.moduleLabel.setVisible(True)
 120             if not supported:
 121                 self.pageContent.warningLabel.setVisible(True)
 122                 selected_cpu = self.projectInfo("CPU_NAME")
 123                 self.pageContent.warningLabel.setText(self.tr("<font color='#FF0000'>Warning: the selected module, \
 124                     is not completely supported by the %1.</font>").arg(selected_cpu))
 125             else:
 126                 self.pageContent.warningLabel.setVisible(False)
 127             self.pageContent.propertyTable.clear()
 128             self.pageContent.propertyTable.setRowCount(0)
 129             if configuration != "":
 130                 configurations = self.projectInfo("CONFIGURATIONS")[configuration]
 131                 param_list = sorted(configurations["paramlist"])
 132                 index = 0
 133                 for i, property in param_list:
 134                     if "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "autoenabled":
 135                         # Doesn't show the hidden fields
 136                         continue
 137                     try:
 138                         param_supported = bertos_utils.isSupported(self.project(), property_id=(configuration, property))
 139                     except SupportedException, e:
 140                         self.exceptionOccurred(self.tr("Error evaluating \"%1\" for parameter %2").arg(e.support_string).arg(property))
 141                         param_supported = True
 142                     if not param_supported:
 143                         # Doesn't show the unsupported parameters
 144                         continue
 145                     # Set the row count to the current index + 1
 146                     self.pageContent.propertyTable.setRowCount(index + 1)
 147                     item = QTableWidgetItem(configurations[property]["brief"])
 148                     item.setData(Qt.UserRole, qvariant_converter.convertString(property))
 149                     self.pageContent.propertyTable.setItem(index, 0, item)
 150                     if "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "boolean":
 151                         self.insertCheckBox(index, configurations[property]["value"])
 152                     elif "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "enum":
 153                         self.insertComboBox(index, configurations[property]["value"], configurations[property]["informations"]["value_list"])
 154                     elif "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "int":
 155                         self.insertSpinBox(index, configurations[property]["value"], configurations[property]["informations"])
 156                     else:
 157                         # Not defined type, rendered as a text field
 158                         self.pageContent.propertyTable.setItem(index, 1, QTableWidgetItem(configurations[property]["value"]))
 159                     index += 1
 160             if self.pageContent.propertyTable.rowCount() == 0:
 161                 module_label = self.pageContent.moduleLabel.text()
 162                 module_label += "\n\nNo configuration needed."
 163                 self.pageContent.moduleLabel.setText(module_label)
 164         else:
 165             self.pageContent.moduleLabel.setText("")
 166             self.pageContent.moduleLabel.setVisible(False)
 167             self.pageContent.propertyTable.clear()
 168             self.pageContent.propertyTable.setRowCount(0)
 169
 170     def dependencyCheck(self, item):
 171         """
 172         Checks the dependencies of the module associated with the given item.
 173         """
 174         checked = False
 175         module = unicode(item.text(0))
 176         if item.checkState(0) == Qt.Checked:
 177             self.moduleSelected(module)
 178         else:
 179             self.moduleUnselected(module)
 180             self.removeFileDependencies(module)
 181
 182     def showPropertyDescription(self):
 183         """
 184         Slot called when the property selection changes. Shows the description
 185         of the selected property.
 186         """
 187         self.resetPropertyDescription()
 188         configurations = self.currentModuleConfigurations()
 189         if self.currentProperty() in configurations:
 190             description = configurations[self.currentProperty()]["brief"]
 191             name = self.currentProperty()
 192             self.currentPropertyItem().setText(description + "\n" + name)
 193
 194     def saveValue(self, index):
 195         """
 196         Slot called when the user modifies one of the configuration parameters.
 197         It stores the new value."""
 198         property = qvariant_converter.getString(self.pageContent.propertyTable.item(index, 0).data(Qt.UserRole))
 199         configuration = self.projectInfo("MODULES")[self.currentModule()]["configuration"]
 200         configurations = self.projectInfo("CONFIGURATIONS")
 201         if "type" not in configurations[configuration][property]["informations"] or configurations[configuration][property]["informations"]["type"] == "int":
 202             configurations[configuration][property]["value"] = unicode(int(self.pageContent.propertyTable.cellWidget(index, 1).value()))
 203         elif configurations[configuration][property]["informations"]["type"] == "enum":
 204             configurations[configuration][property]["value"] = unicode(self.pageContent.propertyTable.cellWidget(index, 1).currentText())
 205         elif configurations[configuration][property]["informations"]["type"] == "boolean":
 206             if self.pageContent.propertyTable.cellWidget(index, 1).isChecked():
 207                 configurations[configuration][property]["value"] = "1"
 208             else:
 209                 configurations[configuration][property]["value"] = "0"
 210         self.setProjectInfo("CONFIGURATIONS", configurations)
 211         if self.moduleItem(self.currentModule()).checkState(0) == Qt.Checked:
 212             self.dependencyCheck(self.moduleItem(self.currentModule()))
 213
 214     ####
 215
 216     def loadModuleData(self):
 217         """
 218         Loads the module data.
 219         """
 220         # Load the module data only if it isn't already loaded
 221         if not self.projectInfo("MODULES") \
 222                 and not self.projectInfo("LISTS") \
 223                 and not self.projectInfo("CONFIGURATIONS"):
 224             try:
 225                 bertos_utils.loadModuleData(self.project())
 226             except ModuleDefineException, e:
 227                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 228             except EnumDefineException, e:
 229                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 230             except ConfigurationDefineException, e:
 231                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 232
 233     def fillModuleTree(self):
 234         """
 235         Fills the module tree with the module entries separated in categories.
 236         """
 237         self.pageContent.moduleTree.clear()
 238         modules = self.projectInfo("MODULES")
 239         if not modules:
 240             return
 241         categories = {}
 242         for module, information in modules.items():
 243             if information["category"] not in categories:
 244                 categories[information["category"]] = []
 245             categories[information["category"]].append(module)
 246         for category, module_list in categories.items():
 247             item = QTreeWidgetItem(QStringList([category]))
 248             for module in module_list:
 249                 enabled = modules[module]["enabled"]
 250                 module_item = QTreeWidgetItem(item, QStringList([module]))
 251                 try:
 252                     supported = bertos_utils.isSupported(self.project(), module=module)
 253                 except SupportedException, e:
 254                     self.exceptionOccurred(self.tr("Error evaluating \"%1\" for module %2").arg(e.support_string).arg(module))
 255                     supported = True
 256                 if not supported:
 257                     module_item.setForeground(0, QBrush(QColor(Qt.red)))
 258                 if enabled:
 259                     module_item.setCheckState(0, Qt.Checked)
 260                 else:
 261                     module_item.setCheckState(0, Qt.Unchecked)
 262             self.pageContent.moduleTree.addTopLevelItem(item)
 263         self.pageContent.moduleTree.sortItems(0, Qt.AscendingOrder)
 264         self.fillPropertyTable()
 265
 266     def insertCheckBox(self, index, value):
 267         """
 268         Inserts in the table at index a checkbox for a boolean property setted
 269         to value.
 270         """
 271         check_box = QCheckBox()
 272         self.pageContent.propertyTable.setCellWidget(index, 1, check_box)
 273         if value == "1":
 274             check_box.setChecked(True)
 275         else:
 276             check_box.setChecked(False)
 277         self._control_group.addControl(index, check_box)
 278
 279     def insertComboBox(self, index, value, value_list):
 280         """
 281         Inserts in the table at index a combobox for an enum property setted
 282         to value.
 283         """
 284         try:
 285             enum = self.projectInfo("LISTS")[value_list]
 286             combo_box = QComboBox()
 287             self.pageContent.propertyTable.setCellWidget(index, 1, combo_box)
 288             for i, element in enumerate(enum):
 289                 combo_box.addItem(element)
 290                 if element == value:
 291                     combo_box.setCurrentIndex(i)
 292             self._control_group.addControl(index, combo_box)
 293         except KeyError:
 294             self.exceptionOccurred(self.tr("Define list \"%1\" not found. Check definition files.").arg(value_list))
 295             self.pageContent.propertyTable.setItem(index, 1, QTableWidgetItem(value))
 296
 297     def insertSpinBox(self, index, value, informations):
 298         """
 299         Inserts in the table at index a spinbox for an int, a long or an unsigned
 300         long property setted to value.
 301         """
 302         # int, long or undefined type property
 303         spin_box = None
 304         if bertos_utils.isLong(informations) or bertos_utils.isUnsignedLong(informations):
 305             spin_box = QDoubleSpinBox()
 306             spin_box.setDecimals(0)
 307         else:
 308             spin_box = QSpinBox()
 309         self.pageContent.propertyTable.setCellWidget(index, 1, spin_box)
 310         minimum = -32768
 311         maximum = 32767
 312         suff = ""
 313         if bertos_utils.isLong(informations):
 314             minimum = -2147483648
 315             maximum = 2147483647
 316             suff = "L"
 317         elif bertos_utils.isUnsigned(informations):
 318             minimum = 0
 319             maximum = 65535
 320             suff = "U"
 321         elif bertos_utils.isUnsignedLong(informations):
 322             minimum = 0
 323             maximum = 4294967295
 324             suff = "UL"
 325         if "min" in informations:
 326             minimum = int(informations["min"])
 327         if "max" in informations:
 328             maximum = int(informations["max"])
 329         spin_box.setRange(minimum, maximum)
 330         spin_box.setSuffix(suff)
 331         spin_box.setValue(int(value.replace("L", "").replace("U", "")))
 332         self._control_group.addControl(index, spin_box)
 333
 334
 335     def currentModule(self):
 336         """
 337         Retuns the current module name.
 338         """
 339         current_module = self.pageContent.moduleTree.currentItem()
 340         # return only the child items
 341         if current_module and current_module.parent():
 342             return unicode(current_module.text(0))
 343         else:
 344             return None
 345
 346     def moduleItem(self, module):
 347         for top_level_index in range(self.pageContent.moduleTree.topLevelItemCount()):
 348             top_level_item = self.pageContent.moduleTree.topLevelItem(top_level_index)
 349             for child_index in range(top_level_item.childCount()):
 350                 child_item = top_level_item.child(child_index)
 351                 if unicode(child_item.text(0)) == module:
 352                     return child_item
 353         return None
 354
 355     def currentModuleConfigurations(self):
 356         """
 357         Returns the current module configuration.
 358         """
 359         return self.configurations(self.currentModule())
 360
 361     def currentProperty(self):
 362         """
 363         Rerturns the current property from the property table.
 364         """
 365         return qvariant_converter.getString(self.pageContent.propertyTable.item(self.pageContent.propertyTable.currentRow(), 0).data(Qt.UserRole))
 366
 367     def currentPropertyItem(self):
 368         """
 369         Returns the QTableWidgetItem of the current property.
 370         """
 371         return self.pageContent.propertyTable.item(self.pageContent.propertyTable.currentRow(), 0)
 372
 373     def configurations(self, module):
 374         """
 375         Returns the configuration for the selected module.
 376         """
 377         configuration = self.projectInfo("MODULES")[module]["configuration"]
 378         if len(configuration) > 0:
 379             return self.projectInfo("CONFIGURATIONS")[configuration]
 380         else:
 381             return {}
 382
 383     def resetPropertyDescription(self):
 384         """
 385         Resets the label for each property table entry.
 386         """
 387         for index in range(self.pageContent.propertyTable.rowCount()):
 388             property_name = qvariant_converter.getString(self.pageContent.propertyTable.item(index, 0).data(Qt.UserRole))
 389             # Awful solution! Needed because if the user change the module, the selection changed...
 390             if property_name not in self.currentModuleConfigurations():
 391                 break
 392             self.pageContent.propertyTable.item(index, 0).setText(self.currentModuleConfigurations()[property_name]['brief'])
 393
 394     def setBold(self, item, bold):
 395         self.pageContent.moduleTree.blockSignals(True)
 396         font = item.font(0)
 397         font.setBold(bold)
 398         item.setFont(0, font)
 399         self.pageContent.moduleTree.blockSignals(False)
 400
 401     def moduleSelected(self, selectedModule):
 402         """
 403         Resolves the selection dependencies.
 404         """
 405         qApp.setOverrideCursor(Qt.WaitCursor)
 406         modules = self.projectInfo("MODULES")
 407         modules[selectedModule]["enabled"] = True
 408         self.setProjectInfo("MODULES", modules)
 409         depends = self.projectInfo("MODULES")[selectedModule]["depends"]
 410         unsatisfied = []
 411         if self.pageContent.automaticFix.isChecked():
 412             unsatisfied = self.selectDependencyCheck(selectedModule)
 413         if len(unsatisfied) > 0:
 414             for module in unsatisfied:
 415                 modules = self.projectInfo("MODULES")
 416                 modules[module]["enabled"] = True
 417             for category in range(self.pageContent.moduleTree.topLevelItemCount()):
 418                 item = self.pageContent.moduleTree.topLevelItem(category)
 419                 for child in range(item.childCount()):
 420                     if unicode(item.child(child).text(0)) in unsatisfied:
 421                         self.setBold(item.child(child), True)
 422                         self.setBold(item, True)
 423                         item.child(child).setCheckState(0, Qt.Checked)
 424         qApp.restoreOverrideCursor()
 425
 426     def moduleUnselected(self, unselectedModule):
 427         """
 428         Resolves the unselection dependencies.
 429         """
 430         qApp.setOverrideCursor(Qt.WaitCursor)
 431         modules = self.projectInfo("MODULES")
 432         modules[unselectedModule]["enabled"] = False
 433         self.setProjectInfo("MODULES", modules)
 434         unsatisfied = []
 435         unsatisfied_params = []
 436         if self.pageContent.automaticFix.isChecked():
 437             unsatisfied, unsatisfied_params = self.unselectDependencyCheck(unselectedModule)
 438         if len(unsatisfied) > 0 or len(unsatisfied_params) > 0:
 439             message = []
 440             heading = self.tr("The module %1 is needed by").arg(unselectedModule)
 441             message.append(heading)
 442             module_list = ", ".join(unsatisfied)
 443             param_list = ", ".join(["%s (%s)" %(param_name, module) for module, param_name in unsatisfied_params])
 444             if module_list:
 445                 message.append(QString(module_list))
 446             if module_list and param_list:
 447                 message.append(self.tr("and by"))
 448             if param_list:
 449                 message.append(QString(param_list))
 450             message_str = QStringList(message).join(" ")
 451             message_str.append(self.tr("\n\nDo you want to automatically fix these conflicts?"))
 452             qApp.restoreOverrideCursor()
 453             choice = QMessageBox.warning(self, self.tr("Dependency error"), message_str, QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
 454             qApp.setOverrideCursor(Qt.WaitCursor)
 455             if choice == QMessageBox.Yes:
 456                 for module in unsatisfied:
 457                     modules = self.projectInfo("MODULES")
 458                     modules[module]["enabled"] = False
 459                 for category in range(self.pageContent.moduleTree.topLevelItemCount()):
 460                     item = self.pageContent.moduleTree.topLevelItem(category)
 461                     for child in range(item.childCount()):
 462                         if unicode(item.child(child).text(0)) in unsatisfied:
 463                             item.child(child).setCheckState(0, Qt.Unchecked)
 464                 for module, param in unsatisfied_params:
 465                     configuration_file = self.projectInfo("MODULES")[module]["configuration"]
 466                     configurations = self.projectInfo("CONFIGURATIONS")
 467                     configurations[configuration_file][param]["value"] = "0"
 468                     self.setProjectInfo("CONFIGURATIONS", configurations)
 469             qApp.restoreOverrideCursor()
 470
 471     def selectDependencyCheck(self, module):
 472         """
 473         Returns the list of unsatisfied dependencies after a selection.
 474         """
 475         unsatisfied = set()
 476         modules = self.projectInfo("MODULES")
 477         files = self.projectInfo("FILES")
 478         configurations = self.projectInfo("CONFIGURATIONS").get(modules[module]["configuration"], {"paramlist": ()})
 479         conditional_deps = ()
 480         for i, param_name in configurations["paramlist"]:
 481             information = configurations[param_name]
 482             if information["informations"]["type"] == "boolean" and \
 483                 information["value"] != "0" and \
 484                 "conditional_deps" in information["informations"]:
 485
 486                 conditional_deps += information["informations"]["conditional_deps"]
 487
 488         for dependency in modules[module]["depends"] + conditional_deps:
 489             if dependency in modules and not modules[dependency]["enabled"]:
 490                 unsatisfied |= set([dependency])
 491                 if dependency not in unsatisfied:
 492                     unsatisfied |= self.selectDependencyCheck(dependency)
 493             if dependency not in modules:
 494                 if dependency in files:
 495                     files[dependency] += 1
 496                 else:
 497                     files[dependency] = 1
 498         self.setProjectInfo("FILES", files)
 499         return unsatisfied
 500
 501     def unselectDependencyCheck(self, dependency):
 502         """
 503         Returns the list of unsatisfied dependencies after an unselection.
 504         """
 505         unsatisfied = set()
 506         unsatisfied_params = set()
 507         modules = self.projectInfo("MODULES")
 508         for module, informations in modules.items():
 509             configurations = self.projectInfo("CONFIGURATIONS").get(informations["configuration"], {"paramlist": ()})
 510             conditional_deps = {}
 511             for i, param_name in configurations["paramlist"]:
 512                 information = configurations[param_name]
 513                 if information["informations"]["type"] == "boolean" and information["value"] != "0" and "conditional_deps" in information["informations"]:
 514                     for dep in information["informations"]["conditional_deps"]:
 515                         if not dep in conditional_deps:
 516                             conditional_deps[dep] = []
 517                         conditional_deps[dep].append((module, param_name))
 518             if dependency in informations["depends"] and informations["enabled"]:
 519                 unsatisfied |= set([module])
 520                 if dependency not in unsatisfied:
 521                     tmp = self.unselectDependencyCheck(module)
 522                     unsatisfied |= tmp[0]
 523                     unsatisfied_params |= tmp[1]
 524             if dependency in conditional_deps:
 525                 unsatisfied_params |= set(conditional_deps[dependency])
 526         return unsatisfied, unsatisfied_params
 527
 528     def removeFileDependencies(self, module):
 529         """
 530         Removes the files dependencies of the given module.
 531         """
 532         modules = self.projectInfo("MODULES")
 533         files = self.projectInfo("FILES")
 534         dependencies = modules[module]["depends"]
 535         for dependency in dependencies:
 536             if dependency in files:
 537                 files[dependency] -= 1
 538                 if files[dependency] == 0:
 539                     del files[dependency]
 540         self.setProjectInfo("FILES", files)
 541
 542 class QControlGroup(QObject):
 543     """
 544     Simple class that permit to connect different signals of different widgets
 545     with a slot that emit a signal. Permits to group widget and to understand which of
 546     them has sent the signal.
 547     """
 548
 549     def __init__(self):
 550         QObject.__init__(self)
 551         self._controls = {}
 552
 553     def addControl(self, id, control):
 554         """
 555         Add a control.
 556         """
 557         self._controls[id] = control
 558         if type(control) == QCheckBox:
 559             self.connect(control, SIGNAL("stateChanged(int)"), lambda: self.stateChanged(id))
 560         elif type(control) == QSpinBox:
 561             self.connect(control, SIGNAL("valueChanged(int)"), lambda: self.stateChanged(id))
 562         elif type(control) == QComboBox:
 563             self.connect(control, SIGNAL("currentIndexChanged(int)"), lambda: self.stateChanged(id))
 564         elif type(control) == QDoubleSpinBox:
 565             self.connect(control, SIGNAL("valueChanged(double)"), lambda: self.stateChanged(id))
 566
 567     def clear(self):
 568         """
 569         Remove all the controls.
 570         """
 571         self._controls = {}
 572
 573     def stateChanged(self, id):
 574         """
 575         Slot called when the value of one of the stored widget changes. It emits
 576         another signal.
 577         """
 578         self.emit(SIGNAL("stateChanged"), id)