ARINC extensions

Extensions add optional features to existing widgets by adding an extension block to the widget in the definition file. Multiple extension blocks can be applied to a single widget to add multiple optional features to that widget. Runtime modifiable parameters and events may also be associated with an extension. See the List of ARINC661 extensions for a list of extensions and their usage. Note that the extension concept has been added to the standard for Supplement 5

Properties

Extensions have properties just as widgets.

For example, the A661_CHILD_INDEX_EXTENSION extension has the following properties:

      <extension arincID="A661_CHILD_INDEX_EXTENSION" hexID="0x8001" supp="5+">
         <widgetAttr name="VisibleChildIndex" arincID="A661_VISIBLE_CHILD_INDEX"/>
         <message type="byte_2" arincID="A661_VISIBLE_CHILD_INDEX"/>
         <event arincID="A661_EVT_VISIBLE_CHILD" type="ushort">
            <eventAttr arincID="A661_VISIBLE_CHILD_INDEX"/>
         </event>
      </extension>

Usage

In this example, the A661_MUTUALLY_EXCLUSIVE_CONTAINER widget has a A661_CHILD_INDEX_EXTENSION:

      <a661_df name="Default" library_version="0" supp_version="5">
         <model>
            <prop name="ApplicationId" value="1" />
         </model>
         <a661_layer name="ExtensionsMutually" >
            <model>
               <prop name="LayerId" value="1" />
               <prop name="ContextNumber" value="0" />
               <prop name="Height" value="10000" />
               <prop name="Width" value="10000" />
            </model>
            <a661_widget name="mutuallyExclusiveContainer" type="A661_MUTUALLY_EXCLUSIVE_CONTAINER">
               <model>
                  <prop name="WidgetIdent" value="1" />
                  <prop name="Enable" value="A661_TRUE" />
                  <prop name="Visible" value="A661_TRUE" />
                  <prop name="PosX" value="0" />
                  <prop name="PosY" value="0" />
                  <prop name="VisibleChild" value="3" />
               </model>
               <a661_extension type="A661_CHILD_INDEX_EXTENSION">
                  <model>
                     <prop name="VisibleChildIndex" value="2" />
                  </model>
               </a661_extension>
               <a661_widget name="gpArcCircle" type="A661_GP_ARC_CIRCLE">
                  <model>
                     <prop name="WidgetIdent" value="3" />
                     <prop name="Anonymous" value="A661_FALSE" />
                     <prop name="Visible" value="A661_TRUE" />
                     <prop name="PosX" value="5210" />
                     <prop name="PosY" value="5563" />
                     <prop name="StartAngle" value="-180.0" />
                     <prop name="EndAngle" value="180.0" />
                     <prop name="Radius" value="2000" />
                     <prop name="StyleSet" value="0" />
                     <prop name="ColorIndex" value="blue" />
                     <prop name="Filled" value="A661_FALSE" />
                     <prop name="FillIndex" value="blue" />
                     <prop name="Halo" value="A661_FALSE" />
                  </model>
               </a661_widget>
               <a661_widget name="gpRectangle" type="A661_GP_RECTANGLE">
                  <model>
                     <prop name="WidgetIdent" value="4" />
                     <prop name="Anonymous" value="A661_FALSE" />
                     <prop name="Visible" value="A661_TRUE" />
                     <prop name="PosX" value="3722" />
                     <prop name="PosY" value="4163" />
                     <prop name="SizeX" value="2000" />
                     <prop name="SizeY" value="2000" />
                     <prop name="StyleSet" value="0" />
                     <prop name="ColorIndex" value="green" />
                     <prop name="Filled" value="A661_FALSE" />
                     <prop name="FillIndex" value="green" />
                     <prop name="Halo" value="A661_FALSE" />
                  </model>
               </a661_widget>
            </a661_widget>
         </a661_layer>
      </a661_df>