Add a ReadOnlySpinBox control that provides a spinBox with a readOnly property

Contributes to CURA-342

resources/qml/Preferences/ReadOnlySpinBox.qml

@@ -0,0 +1,23 @@
+// Copyright (c) 2016 Ultimaker B.V.
+// Uranium is released under the terms of the AGPLv3 or higher.
+
+import QtQuick 2.1
+import QtQuick.Controls 1.1
+import QtQuick.Dialogs 1.2
+
+// Provides a SpinBox with the same readOnly property as a TextField
+SpinBox
+{
+    id: base
+    property bool readOnly: false
+
+    Keys.enabled: !readOnly
+    MouseArea
+    {
+        acceptedButtons: Qt.AllButtons;
+        anchors.fill: parent;
+        enabled: parent.readOnly;
+        onWheel: wheel.accepted = true;
+        cursorShape: enabled ? Qt.ArrowCursor : Qt.IBeamCursor;
+    }
+}