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Add directions for handling text strings (#955)

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DK 2021-01-21 14:28:15 -08:00 committed by GitHub
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components/display/index.rst
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@ -277,7 +277,16 @@ arguments after the format string in the right order.
// %% - literal % sign
it.printf(0, 0, id(my_font), "Temperature: %.1f°C, Humidity: %.1f%%", id(temperature).state, id(humidity).state);
To display a text string from a ``text_sensor``, append ``.c_str()`` to the end of your variable.
.. code-block:: yaml
display:
- platform: ...
# ...
lambda: |-
it.printf(0, 0, id(my_font), "Text to follow: %s", id(template_text).state.c_str());
The last printf tip for use in displays I will discuss here is how to display binary sensor values. You
*could* of course just check the state with an ``if`` statement as the first few lines in the example below, but if
you want to be efficient you can use an *inline if* too. With the ``%s`` print specifier you can tell it to