[processing] Use QgsDoubleSpinBox instead of QSpinBox

Allows for simple calculations in spin box, adds a reset control
to reset widget to default value

python/plugins/processing/gui/ConfigDialog.py

@@ -32,8 +32,9 @@ from PyQt4 import uic
 from PyQt4.QtCore import Qt, QEvent, QPyNullVariant
 from PyQt4.QtGui import (QFileDialog, QDialog, QIcon, QStyle,
                          QStandardItemModel, QStandardItem, QMessageBox, QStyledItemDelegate,
-                         QLineEdit, QSpinBox, QDoubleSpinBox, QWidget, QToolButton, QHBoxLayout,
+                         QLineEdit, QWidget, QToolButton, QHBoxLayout,
                          QComboBox)
+from qgis.gui import QgsDoubleSpinBox, QgsSpinBox
 
 from processing.core.ProcessingConfig import ProcessingConfig, Setting
 from processing.core.Processing import Processing
@@ -198,11 +199,11 @@ class SettingDelegate(QStyledItemDelegate):
         else:
             value = self.convertValue(index.model().data(index, Qt.EditRole))
             if isinstance(value, (int, long)):
-                spnBox = QSpinBox(parent)
+                spnBox = QgsSpinBox(parent)
                 spnBox.setRange(-999999999, 999999999)
                 return spnBox
             elif isinstance(value, float):
-                spnBox = QDoubleSpinBox(parent)
+                spnBox = QgsDoubleSpinBox(parent)
                 spnBox.setRange(-999999999.999999, 999999999.999999)
                 spnBox.setDecimals(6)
                 return spnBox

python/plugins/processing/gui/NumberInputPanel.py

@@ -61,6 +61,7 @@ class NumberInputPanel(BASE, WIDGET):
             self.spnValue.setMinimum(-99999999)
 
         self.spnValue.setValue(float(number))
+        self.spnValue.setClearValue(float(number))
 
         self.btnCalc.clicked.connect(self.showNumberInputDialog)
 

python/plugins/processing/ui/widgetNumberSelector.ui

@@ -21,7 +21,7 @@
     <number>0</number>
    </property>
    <item>
-    <widget class="QDoubleSpinBox" name="spnValue">
+    <widget class="QgsDoubleSpinBox" name="spnValue">
      <property name="decimals">
       <number>6</number>
      </property>
@@ -45,6 +45,14 @@
    </item>
   </layout>
  </widget>
+ <customwidgets>
+  <customwidget>
+   <class>QgsDoubleSpinBox</class>
+   <extends>QDoubleSpinBox</extends>
+   <header>qgis.gui</header>
+   <container>1</container>
+  </customwidget> 
+ </customwidgets>
  <resources/>
  <connections/>
 </ui>