Create the boolean widget wrapper

python/plugins/processing/core/parameters.py

@@ -132,8 +132,12 @@ def tr(self, string, context=''):
 
 class ParameterBoolean(Parameter):
 
-    def __init__(self, name='', description='', default=None, optional=False):
-        Parameter.__init__(self, name, description, parseBool(default), optional)
+    default_metadata = {
+        'widget_wrapper': 'processing.gui.wrappers.BooleanWidgetWrapper'
+    }
+
+    def __init__(self, name='', description='', default=None, optional=False, metadata={}):
+        Parameter.__init__(self, name, description, parseBool(default), optional, metadata)
 
     def setValue(self, value):
         if value is None:

python/plugins/processing/gui/wrappers.py

@@ -0,0 +1,117 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    BooleanWidget.py
+    ---------------------
+    Date                 : May 2016
+    Copyright            : (C) 2016 by Arnaud Morvan
+    Email                : arnaud dot morvan at camptocamp dot com
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Arnaud Morvan'
+__date__ = 'May 2016'
+__copyright__ = '(C) 2016, Arnaud Morvan'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+
+from inspect import isclass
+
+from qgis.PyQt.QtWidgets import (
+    QCheckBox,
+    QComboBox,
+    )
+
+DIALOG_STANDARD = 'standard'
+DIALOG_BATCH = 'batch'
+DIALOG_MODELER = 'modeler'
+
+
+def wrapper_from_param(param, dialog=DIALOG_STANDARD, extra_values=[]):
+    wrapper = param.metadata.get('widget_wrapper', None)
+    # wrapper metadata should be a class path
+    if isinstance(wrapper, basestring):
+        tokens = wrapper.split('.')
+        mod = __import__('.'.join(tokens[:-1]), fromlist=[tokens[-1]])
+        wrapper = getattr(mod, tokens[-1])
+    # or directly a class object
+    if isclass(wrapper):
+        wrapper = wrapper(param=param, dialog=dialog, extra_values=extra_values)
+    # or a wrapper instance
+    return wrapper
+
+
+class NotYetImplementedWidgetWrapper():
+
+    """Temporary substitute class for not yet implemented wrappers"""
+
+    implemented = False
+
+    def __init__(self, param, widget):
+        self.param = param
+        self.widget = widget
+
+
+class WidgetWrapper():
+
+    implemented = True  # TODO: Should be removed at the end
+
+    def __init__(self, param, dialog=DIALOG_STANDARD, extra_values=[]):
+        self.param = param
+        self.dialog = dialog
+        self.widget = self.createWidget(extra_values)
+        self.setValue(param.default)
+
+    def createWidget(self, extra_values=[]):
+        pass
+
+    def setValue(self, value):
+        pass
+
+    def value(self):
+        pass
+
+
+class BooleanWidgetWrapper(WidgetWrapper):
+
+    def createWidget(self, extra_values=[]):
+        if self.dialog == DIALOG_STANDARD:
+            return QCheckBox()
+
+        if self.dialog in (DIALOG_BATCH, DIALOG_MODELER):
+            widget = QComboBox()
+            widget.addItem(widget.tr('Yes'), True)
+            widget.addItem(widget.tr('No'), False)
+            for text, value in extra_values:
+                widget.addItem(text, value)
+            return widget
+
+    def setValue(self, value):
+        if self.dialog == DIALOG_STANDARD:
+            self.widget.setChecked(value)
+
+        if self.dialog in (DIALOG_BATCH, DIALOG_MODELER):
+            values = [self.widget.itemData(i) for i in range(self.widget.count())]
+            try:
+                idx = values.index(value)
+                self.widget.setCurrentIndex(idx)
+            except ValueError:
+                pass
+
+    def value(self):
+        if self.dialog == DIALOG_STANDARD:
+            return self.widget.isChecked()
+
+        if self.dialog in (DIALOG_BATCH, DIALOG_MODELER):
+            return self.widget.itemData(self.widget.currentIndex())