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         try:
  90             QApplication.instance().setOverrideCursor(Qt.WaitCursor)
  91             self.setupUi()
  92             self.loadModuleData()
  93             self.fillModuleTree()
  94         finally:
  95             QApplication.instance().restoreOverrideCursor()
  96
  97     ####
  98
  99     ## Slots ##
 100
 101     def moduleClicked(self, item, column):
 102         self.setBold(item, False)
 103
 104     def fillPropertyTable(self):
 105         """
 106         Slot called when the user selects a module from the module tree.
 107         Fills the property table using the configuration parameters defined in
 108         the source tree.
 109         """
 110         module = self.currentModule()
 111         if module:
 112             try:
 113                 supported = bertos_utils.isSupported(self.project, module=module)
 114             except SupportedException, e:
 115                 self.exceptionOccurred(self.tr("Error evaluating \"%1\" for module %2").arg(e.support_string).arg(module))
 116                 supported = True
 117             self._control_group.clear()
 118             configuration = self.projectInfo("MODULES")[module]["configuration"]
 119             module_description = self.projectInfo("MODULES")[module]["description"]
 120             self.pageContent.moduleLabel.setText(module_description)
 121             self.pageContent.moduleLabel.setVisible(True)
 122             if not supported:
 123                 self.pageContent.warningLabel.setVisible(True)
 124                 selected_cpu = self.projectInfo("CPU_NAME")
 125                 self.pageContent.warningLabel.setText(self.tr("<font color='#FF0000'>Warning: the selected module, \
 126                     is not completely supported by the %1.</font>").arg(selected_cpu))
 127             else:
 128                 self.pageContent.warningLabel.setVisible(False)
 129             self.pageContent.propertyTable.clear()
 130             self.pageContent.propertyTable.setRowCount(0)
 131             if configuration != "":
 132                 configurations = self.projectInfo("CONFIGURATIONS")[configuration]
 133                 param_list = sorted(configurations["paramlist"])
 134                 index = 0
 135                 for i, property in param_list:
 136                     if "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "autoenabled":
 137                         # Doesn't show the hidden fields
 138                         continue
 139                     try:
 140                         param_supported = bertos_utils.isSupported(self.project, property_id=(configuration, property))
 141                     except SupportedException, e:
 142                         self.exceptionOccurred(self.tr("Error evaluating \"%1\" for parameter %2").arg(e.support_string).arg(property))
 143                         param_supported = True
 144                     if not param_supported:
 145                         # Doesn't show the unsupported parameters
 146                         continue
 147                     # Set the row count to the current index + 1
 148                     self.pageContent.propertyTable.setRowCount(index + 1)
 149                     item = QTableWidgetItem(configurations[property]["brief"])
 150                     item.setFlags(item.flags() & ~Qt.ItemIsSelectable)
 151                     item.setToolTip(property)
 152                     item.setData(Qt.UserRole, qvariant_converter.convertString(property))
 153                     self.pageContent.propertyTable.setItem(index, 0, item)
 154                     if "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "boolean":
 155                         self.insertCheckBox(index, configurations[property]["value"])
 156                     elif "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "enum":
 157                         self.insertComboBox(index, configurations[property]["value"], configurations[property]["informations"]["value_list"])
 158                     elif "type" in configurations[property]["informations"] and configurations[property]["informations"]["type"] == "int":
 159                         self.insertSpinBox(index, configurations[property]["value"], configurations[property]["informations"])
 160                     else:
 161                         # Not defined type, rendered as a text field
 162                         self.pageContent.propertyTable.setItem(index, 1, QTableWidgetItem(configurations[property]["value"]))
 163                     index += 1
 164             if self.pageContent.propertyTable.rowCount() == 0:
 165                 module_label = self.pageContent.moduleLabel.text()
 166                 module_label += "\n\nNo configuration needed."
 167                 self.pageContent.moduleLabel.setText(module_label)
 168         else:
 169             self.pageContent.moduleLabel.setText("")
 170             self.pageContent.moduleLabel.setVisible(False)
 171             self.pageContent.propertyTable.clear()
 172             self.pageContent.propertyTable.setRowCount(0)
 173
 174     def dependencyCheck(self, item):
 175         """
 176         Checks the dependencies of the module associated with the given item.
 177         """
 178         checked = False
 179         module = unicode(item.text(0))
 180         if item.checkState(0) == Qt.Checked:
 181             self.moduleSelected(module)
 182         else:
 183             self.moduleUnselected(module)
 184             self.removeFileDependencies(module)
 185
 186     def showPropertyDescription(self):
 187         """
 188         Slot called when the property selection changes. Shows the description
 189         of the selected property.
 190         """
 191         self.resetPropertyDescription()
 192         configurations = self.currentModuleConfigurations()
 193         if self.currentProperty() in configurations:
 194             description = configurations[self.currentProperty()]["brief"]
 195             name = self.currentProperty()
 196             self.currentPropertyItem().setText(description + "\n" + name)
 197
 198     def saveValue(self, index):
 199         """
 200         Slot called when the user modifies one of the configuration parameters.
 201         It stores the new value."""
 202         property = qvariant_converter.getString(self.pageContent.propertyTable.item(index, 0).data(Qt.UserRole))
 203         configuration = self.projectInfo("MODULES")[self.currentModule()]["configuration"]
 204         configurations = self.projectInfo("CONFIGURATIONS")
 205         if "type" not in configurations[configuration][property]["informations"] or configurations[configuration][property]["informations"]["type"] == "int":
 206             configurations[configuration][property]["value"] = unicode(int(self.pageContent.propertyTable.cellWidget(index, 1).value()))
 207         elif configurations[configuration][property]["informations"]["type"] == "enum":
 208             configurations[configuration][property]["value"] = unicode(self.pageContent.propertyTable.cellWidget(index, 1).currentText())
 209         elif configurations[configuration][property]["informations"]["type"] == "boolean":
 210             if self.pageContent.propertyTable.cellWidget(index, 1).isChecked():
 211                 configurations[configuration][property]["value"] = "1"
 212             else:
 213                 configurations[configuration][property]["value"] = "0"
 214         self.setProjectInfo("CONFIGURATIONS", configurations)
 215         if self.moduleItem(self.currentModule()).checkState(0) == Qt.Checked:
 216             self.dependencyCheck(self.moduleItem(self.currentModule()))
 217
 218     ####
 219
 220     def loadModuleData(self):
 221         """
 222         Loads the module data.
 223         """
 224         # Do not load the module data again when the Wizard is in editing mode
 225         # or when it's working on a preset.
 226         if not self.project.edit and not self.project.from_preset:
 227             # Load the module data every time so that if the user changed the cpu
 228             # the right configurations are picked up.
 229             try:
 230                 self.project.loadModuleData()
 231             except ModuleDefineException, e:
 232                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 233             except EnumDefineException, e:
 234                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 235             except ConfigurationDefineException, e:
 236                 self.exceptionOccurred(self.tr("Error parsing line '%2' in file %1").arg(e.path).arg(e.line))
 237
 238     def fillModuleTree(self):
 239         """
 240         Fills the module tree with the module entries separated in categories.
 241         """
 242         self.pageContent.moduleTree.clear()
 243         modules = self.projectInfo("MODULES")
 244         if not modules:
 245             return
 246         categories = {}
 247         for module, information in modules.items():
 248             if information["category"] not in categories:
 249                 categories[information["category"]] = []
 250             categories[information["category"]].append(module)
 251         for category, module_list in categories.items():
 252             item = QTreeWidgetItem(QStringList([category]))
 253             for module in module_list:
 254                 enabled = modules[module]["enabled"]
 255                 module_item = QTreeWidgetItem(item, QStringList([module]))
 256                 try:
 257                     supported = bertos_utils.isSupported(self.project, module=module)
 258                 except SupportedException, e:
 259                     self.exceptionOccurred(self.tr("Error evaluating \"%1\" for module %2").arg(e.support_string).arg(module))
 260                     supported = True
 261                 if not supported:
 262                     module_item.setForeground(0, QBrush(QColor(Qt.red)))
 263                 if enabled:
 264                     module_item.setCheckState(0, Qt.Checked)
 265                 else:
 266                     module_item.setCheckState(0, Qt.Unchecked)
 267             self.pageContent.moduleTree.addTopLevelItem(item)
 268         self.pageContent.moduleTree.sortItems(0, Qt.AscendingOrder)
 269         self.fillPropertyTable()
 270
 271     def insertCheckBox(self, index, value):
 272         """
 273         Inserts in the table at index a checkbox for a boolean property setted
 274         to value.
 275         """
 276         check_box = QCheckBox()
 277         self.pageContent.propertyTable.setCellWidget(index, 1, check_box)
 278         if value == "1":
 279             check_box.setChecked(True)
 280         else:
 281             check_box.setChecked(False)
 282         self._control_group.addControl(index, check_box)
 283
 284     def insertComboBox(self, index, value, value_list):
 285         """
 286         Inserts in the table at index a combobox for an enum property setted
 287         to value.
 288         """
 289         try:
 290             enum = self.projectInfo("LISTS")[value_list]
 291             combo_box = QComboBox()
 292             self.pageContent.propertyTable.setCellWidget(index, 1, combo_box)
 293             for i, element in enumerate(enum):
 294                 combo_box.addItem(element)
 295                 if element == value:
 296                     combo_box.setCurrentIndex(i)
 297             self._control_group.addControl(index, combo_box)
 298         except KeyError:
 299             self.exceptionOccurred(self.tr("Define list \"%1\" not found. Check definition files.").arg(value_list))
 300             self.pageContent.propertyTable.setItem(index, 1, QTableWidgetItem(value))
 301
 302     def insertSpinBox(self, index, value, informations):
 303         """
 304         Inserts in the table at index a spinbox for an int, a long or an unsigned
 305         long property setted to value.
 306         """
 307         # int, long or undefined type property
 308         spin_box = None
 309         if bertos_utils.isLong(informations) or bertos_utils.isUnsignedLong(informations):
 310             spin_box = QDoubleSpinBox()
 311             spin_box.setDecimals(0)
 312         else:
 313             spin_box = QSpinBox()
 314         self.pageContent.propertyTable.setCellWidget(index, 1, spin_box)
 315         minimum = -32768
 316         maximum = 32767
 317         suff = ""
 318         if bertos_utils.isLong(informations):
 319             minimum = -2147483648
 320             maximum = 2147483647
 321             suff = "L"
 322         elif bertos_utils.isUnsigned(informations):
 323             minimum = 0
 324             maximum = 65535
 325             suff = "U"
 326         elif bertos_utils.isUnsignedLong(informations):
 327             minimum = 0
 328             maximum = 4294967295
 329             suff = "UL"
 330         if "min" in informations:
 331             minimum = int(informations["min"])
 332         if "max" in informations:
 333             maximum = int(informations["max"])
 334         spin_box.setRange(minimum, maximum)
 335         spin_box.setSuffix(suff)
 336         spin_box.setValue(int(value.replace("L", "").replace("U", "")))
 337         self._control_group.addControl(index, spin_box)
 338
 339
 340     def currentModule(self):
 341         """
 342         Retuns the current module name.
 343         """
 344         current_module = self.pageContent.moduleTree.currentItem()
 345         # return only the child items
 346         if current_module and current_module.parent():
 347             return unicode(current_module.text(0))
 348         else:
 349             return None
 350
 351     def moduleItem(self, module):
 352         for top_level_index in range(self.pageContent.moduleTree.topLevelItemCount()):
 353             top_level_item = self.pageContent.moduleTree.topLevelItem(top_level_index)
 354             for child_index in range(top_level_item.childCount()):
 355                 child_item = top_level_item.child(child_index)
 356                 if unicode(child_item.text(0)) == module:
 357                     return child_item
 358         return None
 359
 360     def currentModuleConfigurations(self):
 361         """
 362         Returns the current module configuration.
 363         """
 364         return self.configurations(self.currentModule())
 365
 366     def currentProperty(self):
 367         """
 368         Rerturns the current property from the property table.
 369         """
 370         return qvariant_converter.getString(self.pageContent.propertyTable.item(self.pageContent.propertyTable.currentRow(), 0).data(Qt.UserRole))
 371
 372     def currentPropertyItem(self):
 373         """
 374         Returns the QTableWidgetItem of the current property.
 375         """
 376         return self.pageContent.propertyTable.item(self.pageContent.propertyTable.currentRow(), 0)
 377
 378     def configurations(self, module):
 379         """
 380         Returns the configuration for the selected module.
 381         """
 382         configuration = []
 383         if module:
 384             # On linux platform it seems that the behaviour of the focus
 385             # changing is a bit different from the mac one. So if module is
 386             # None then no configurations should be returned.
 387             configuration = self.projectInfo("MODULES")[module]["configuration"]
 388         if len(configuration) > 0:
 389             return self.projectInfo("CONFIGURATIONS")[configuration]
 390         else:
 391             return {}
 392
 393     def resetPropertyDescription(self):
 394         """
 395         Resets the label for each property table entry.
 396         """
 397         for index in range(self.pageContent.propertyTable.rowCount()):
 398             property_name = qvariant_converter.getString(self.pageContent.propertyTable.item(index, 0).data(Qt.UserRole))
 399             # Awful solution! Needed because if the user change the module, the selection changed...
 400             if property_name not in self.currentModuleConfigurations():
 401                 break
 402             self.pageContent.propertyTable.item(index, 0).setText(self.currentModuleConfigurations()[property_name]['brief'])
 403
 404     def setBold(self, item, bold):
 405         self.pageContent.moduleTree.blockSignals(True)
 406         font = item.font(0)
 407         font.setBold(bold)
 408         item.setFont(0, font)
 409         self.pageContent.moduleTree.blockSignals(False)
 410
 411     def moduleSelected(self, selectedModule):
 412         """
 413         Resolves the selection dependencies.
 414         """
 415         try:
 416             qApp.setOverrideCursor(Qt.WaitCursor)
 417             modules = self.projectInfo("MODULES")
 418             modules[selectedModule]["enabled"] = True
 419             self.setProjectInfo("MODULES", modules)
 420             depends = self.projectInfo("MODULES")[selectedModule]["depends"]
 421             unsatisfied = []
 422             if self.pageContent.automaticFix.isChecked():
 423                 unsatisfied = self.selectDependencyCheck(selectedModule)
 424             if len(unsatisfied) > 0:
 425                 for module in unsatisfied:
 426                     modules = self.projectInfo("MODULES")
 427                     modules[module]["enabled"] = True
 428                 for category in range(self.pageContent.moduleTree.topLevelItemCount()):
 429                     item = self.pageContent.moduleTree.topLevelItem(category)
 430                     for child in range(item.childCount()):
 431                         if unicode(item.child(child).text(0)) in unsatisfied:
 432                             self.setBold(item.child(child), True)
 433                             self.setBold(item, True)
 434                             item.child(child).setCheckState(0, Qt.Checked)
 435         finally:
 436             qApp.restoreOverrideCursor()
 437
 438     def moduleUnselected(self, unselectedModule):
 439         """
 440         Resolves the unselection dependencies.
 441         """
 442         try:
 443             qApp.setOverrideCursor(Qt.WaitCursor)
 444             modules = self.projectInfo("MODULES")
 445             modules[unselectedModule]["enabled"] = False
 446             self.setProjectInfo("MODULES", modules)
 447             unsatisfied = []
 448             unsatisfied_params = []
 449             if self.pageContent.automaticFix.isChecked():
 450                 unsatisfied, unsatisfied_params = self.unselectDependencyCheck(unselectedModule)
 451             if len(unsatisfied) > 0 or len(unsatisfied_params) > 0:
 452                 message = []
 453                 heading = self.tr("The module %1 is needed by").arg(unselectedModule)
 454                 message.append(heading)
 455                 module_list = ", ".join(unsatisfied)
 456                 param_list = ", ".join(["%s (%s)" %(param_name, module) for module, param_name in unsatisfied_params])
 457                 if module_list:
 458                     message.append(QString(module_list))
 459                 if module_list and param_list:
 460                     message.append(self.tr("and by"))
 461                 if param_list:
 462                     message.append(QString(param_list))
 463                 message_str = QStringList(message).join(" ")
 464                 message_str.append(self.tr("\n\nDo you want to automatically fix these conflicts?"))
 465                 qApp.restoreOverrideCursor()
 466                 choice = QMessageBox.warning(self, self.tr("Dependency error"), message_str, QMessageBox.Yes | QMessageBox.No, QMessageBox.Yes)
 467                 qApp.setOverrideCursor(Qt.WaitCursor)
 468                 if choice == QMessageBox.Yes:
 469                     for module in unsatisfied:
 470                         modules = self.projectInfo("MODULES")
 471                         modules[module]["enabled"] = False
 472                     for category in range(self.pageContent.moduleTree.topLevelItemCount()):
 473                         item = self.pageContent.moduleTree.topLevelItem(category)
 474                         for child in range(item.childCount()):
 475                             if unicode(item.child(child).text(0)) in unsatisfied:
 476                                 item.child(child).setCheckState(0, Qt.Unchecked)
 477                     for module, param in unsatisfied_params:
 478                         configuration_file = self.projectInfo("MODULES")[module]["configuration"]
 479                         configurations = self.projectInfo("CONFIGURATIONS")
 480                         configurations[configuration_file][param]["value"] = "0"
 481                         self.setProjectInfo("CONFIGURATIONS", configurations)
 482         finally:
 483             qApp.restoreOverrideCursor()
 484
 485     def selectDependencyCheck(self, module):
 486         """
 487         Returns the list of unsatisfied dependencies after a selection.
 488         """
 489         unsatisfied = set()
 490         modules = self.projectInfo("MODULES")
 491         files = self.projectInfo("FILES")
 492         configurations = self.projectInfo("CONFIGURATIONS").get(modules[module]["configuration"], {"paramlist": ()})
 493         conditional_deps = ()
 494         for i, param_name in configurations["paramlist"]:
 495             information = configurations[param_name]
 496             if information["informations"]["type"] == "boolean" and \
 497                 information["value"] != "0" and \
 498                 "conditional_deps" in information["informations"]:
 499
 500                 conditional_deps += information["informations"]["conditional_deps"]
 501
 502         for dependency in modules[module]["depends"] + conditional_deps:
 503             if dependency in modules and not modules[dependency]["enabled"]:
 504                 unsatisfied |= set([dependency])
 505                 if dependency not in unsatisfied:
 506                     unsatisfied |= self.selectDependencyCheck(dependency)
 507             if dependency not in modules:
 508                 if dependency in files:
 509                     files[dependency] += 1
 510                 else:
 511                     files[dependency] = 1
 512         self.setProjectInfo("FILES", files)
 513         return unsatisfied
 514
 515     def unselectDependencyCheck(self, dependency):
 516         """
 517         Returns the list of unsatisfied dependencies after an unselection.
 518         """
 519         unsatisfied = set()
 520         unsatisfied_params = set()
 521         modules = self.projectInfo("MODULES")
 522         for module, informations in modules.items():
 523             configurations = self.projectInfo("CONFIGURATIONS").get(informations["configuration"], {"paramlist": ()})
 524             conditional_deps = {}
 525             for i, param_name in configurations["paramlist"]:
 526                 information = configurations[param_name]
 527                 if information["informations"]["type"] == "boolean" and information["value"] != "0" and "conditional_deps" in information["informations"]:
 528                     for dep in information["informations"]["conditional_deps"]:
 529                         if not dep in conditional_deps:
 530                             conditional_deps[dep] = []
 531                         conditional_deps[dep].append((module, param_name))
 532             if dependency in informations["depends"] and informations["enabled"]:
 533                 unsatisfied |= set([module])
 534                 if dependency not in unsatisfied:
 535                     tmp = self.unselectDependencyCheck(module)
 536                     unsatisfied |= tmp[0]
 537                     unsatisfied_params |= tmp[1]
 538             if dependency in conditional_deps:
 539                 unsatisfied_params |= set(conditional_deps[dependency])
 540         return unsatisfied, unsatisfied_params
 541
 542     def removeFileDependencies(self, module):
 543         """
 544         Removes the files dependencies of the given module.
 545         """
 546         modules = self.projectInfo("MODULES")
 547         files = self.projectInfo("FILES")
 548         dependencies = modules[module]["depends"]
 549         for dependency in dependencies:
 550             if dependency in files:
 551                 files[dependency] -= 1
 552                 if files[dependency] == 0:
 553                     del files[dependency]
 554         self.setProjectInfo("FILES", files)
 555
 556 class QControlGroup(QObject):
 557     """
 558     Simple class that permit to connect different signals of different widgets
 559     with a slot that emit a signal. Permits to group widget and to understand which of
 560     them has sent the signal.
 561     """
 562
 563     def __init__(self):
 564         QObject.__init__(self)
 565         self._controls = {}
 566
 567     def addControl(self, id, control):
 568         """
 569         Add a control.
 570         """
 571         self._controls[id] = control
 572         if type(control) == QCheckBox:
 573             self.connect(control, SIGNAL("stateChanged(int)"), lambda: self.stateChanged(id))
 574         elif type(control) == QSpinBox:
 575             self.connect(control, SIGNAL("valueChanged(int)"), lambda: self.stateChanged(id))
 576         elif type(control) == QComboBox:
 577             self.connect(control, SIGNAL("currentIndexChanged(int)"), lambda: self.stateChanged(id))
 578         elif type(control) == QDoubleSpinBox:
 579             self.connect(control, SIGNAL("valueChanged(double)"), lambda: self.stateChanged(id))
 580
 581     def clear(self):
 582         """
 583         Remove all the controls.
 584         """
 585         self._controls = {}
 586
 587     def stateChanged(self, id):
 588         """
 589         Slot called when the value of one of the stored widget changes. It emits
 590         another signal.
 591         """
 592         self.emit(SIGNAL("stateChanged"), id)