The Horizon spinner was using a spinner generated and animated
entirely out of JavaScript. Since CSS3 provides animates and we have
access to icon fonts, doing everything with JavaScript is not
necessary and actually taxing on the browser. Plus, all of the
spinner options were being passed in and around with JavaScript,
including the colors. This makes it supremely difficult to use the
theme to style the spinner.
The new spinner is just defined by a handful of templates now. There
are two clientside templates to support Legacy Horizon, and one
template in the Angular to support spinners going forward. Legacy
Horizon had two forms of spinners, so it was broken up. Angular as
not yet made use of the inline spinner, but should follow the same
markup when it is made.
There are two types of spinners, inline spinners (those shown when a
dynamic tab content is loading) and modal spinners (various other
places). These are consistent with each other for the 'default'
experience, but their experience can be entirely customized separate
from each other. 'material' has been augmented with loaders defined
within their design spec to show the power of this new feature.
horizon.templates.js was augmented with this refactor to support only
having to compile one tempalte at a time (instead of all of them) and
caching that template so that all of them can be recompiled later.
Also, horizon.loader.js was added to house template compilation code
that was repeated in several locations.
To test overwriting page modal spinner and inline-modal spinner
examples, please follow the instructions in _loading_inline_exmaple.html,
_loading_modal_example.html under
openstack_dashboard/themes/material/templates/horizon/client_side
Change-Id: I92bc786160e070d30691eeabd4f2a50d6e2bb395
Partially-implements: blueprint horizon-theme-css-reorg
Partially-Implements: blueprint bootstrap-html-standards
Closes-bug: #1570485
c219a3efc6