Attribute Led Display
*********************

The widget evaluates a simple condition and displays a green LED when the condition is met, or a red LED when it is not.


Widget setting 
===============

It is possible to set the widget in the backend. The following image shows an example of a widget setting. 

\ |IMG1|\ 

The widget takes the actual value of the selected device's attribute. In this example, the attribute is double_scalar attribute from the sys/tg_test/1 device. 
The value is compared to a defined 'Compare value' using a relation. In this case, is more than. 
If the value matches the condition, the LED widget displays a LED based on the selected style, in this example it is orange. 

\ |IMG2|\ 

It is possible to customize the widget settings from the inspector panel (in edit mode), as shown below: 


+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Input value          |Description                                                                                                                                     |
+=====================+================================================================================================================================================+
|Device               |Type in a device name (or * to list all devices)                                                                                                |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Attribute            |Once a device is selected, type in an attribute name (or * to list all available attributes)                                                    |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Relation             |Specify the type of relation. It could be: “is more than”, “is less than”, “is equal to”, “is more than or equal to”, “is less than or equal to”|
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Compare              |Specify the target value (number or string)                                                                                                     |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|True Color           |Specify the color that the led assumes when the actual value matches the condition                                                              |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|False Color          |Specify the color that the led assumes when the actual value doesn't match the condition                                                        |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Size of LED          |The size of the LED. It is express in units                                                                                                     |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Text Size (in units) |The size of the text. It is express in units                                                                                                    |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Show Attribute Value |shows the actual value to the right of the LED when enabled                                                                                     |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Show Device Name     |Displays the tango database name when enabled                                                                                                   |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Attribute Display    |Select the Label, Name, or None for the attribute                                                                                               |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Align Text on Center |Aligns the text to the center when enabled                                                                                                      |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Align Value on Right |Aligns the value to the right when enabled                                                                                                      |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+
|Custom CSS           |Write custom CSS for the widget container. The syntax is the same as standard CSS used in HTML files                                            |
+---------------------+------------------------------------------------------------------------------------------------------------------------------------------------+

.. bottom of content

.. |IMG1| image:: _static/img/Led_Widget_1.png
   :height: 482 px
   :width: 259 px

.. |IMG2| image:: _static/img/Led_Widget_2.png
   :height: 89 px
   :width: 276 px