textPlaceholder
Draws some skeleton UI which is typically used whilst content is 'loading'.
The shape is not customizable as it's meant to display the same style for each text placeholders.
A cross-fade transition will be applied to the content and placeholder UI when the visible value changes.
This placeholder display a fade animation.
You can find more information on the pattern at the Material Theming Placeholder UI guidelines.
Parameters
visible
whether the placeholder should be visible or not.