LoadingIndicator_Stylesheet.yaml

A loading indicator: a shape that morphs while something loads.

The look of LoadingIndicator (in Progress indicators). How component stylesheets work.

The stylesheet

# LoadingIndicator: the look of each part of the component, by the part's id.
# A value in {{ }} is one of the component's parameters.
styles:
  - id: root
    style:
      width: "{{ size }}"
      height: "{{ size }}"
      foreground: "{{ background }}"

How it is tied to the component

LoadingIndicator_Component.yaml holds the structure: the parts, each with an id. This file holds the look: each rule's id names a part, and its style is what that part looks like. When a view uses component: LoadingIndicator, Tesserae fills in the parameters (a value like "{{ width }}" becomes the width the view passed), picks a branch of any if:, and puts each rule under the style the part already has, so a part's own style: always wins.

The parts

root (LoadingIndicator)

Field	Value	What it does
width	the size parameter	Pixels, auto (its content's size, or stretched), or a percentage of the parent such as 50%.
height	the size parameter	Pixels, auto (its content's size, or stretched), or a percentage of the parent such as 50%.
foreground	the background parameter	Its text or glyph colour: a theme role, #RRGGBB, any CSS colour, or a gradient.

What it makes

With size: 40, background: primary, each part's style is:

root: {width: 40, height: 40, foreground: primary}

Changing it

Put a LoadingIndicator_Stylesheet.yaml next to your views. Its rules go over this file's, field by field:

styles:
  - id: root
    style: {foreground: tertiary}