Commits on May 12, 2015

1. Refine component lifecycle hooks …

   This commit refines the lifecycle hooks to more completely support the
   use-cases.
   
   On first render (in order):
   
   * `didInitAttrs` runs after `attrs` is guaranteed to be up to date. This
     is more reliable than trying to ensure that `attrs` are always
     available on `init`.
   * `didReceiveAttrs` runs after `didInitAttrs` (it also runs on
     subsequent re-renders, which is useful for logic that is the same
     on all renders).
   * `willRender` runs before the template is rendered. It runs when the
     template is updated for any reason (both initial and re-render, and
     regardless of whether the change was caused by an attrs change or
     re-render).
   * `didInsertElement` runs after the template has rendered and the
     element is in the DOM.
   * `didRender` runs after `didInsertElement` (it also runs on subsequent
     re-renders).
   
   On re-render (in order):
   
   * `didUpdateAttrs` runs when the attributes of a component have changed
     (but not when the component is re-rendered, via `component.rerender`,
     `component.set`, or changes in models or services used by the
     template).
   * `didReceiveAttrs`, same as above.
   * `willUpdate` runs when the component is re-rendering for any reason,
     including `component.rerender()`, `component.set()` or changes in
     models or services used by the template.
   * `willRender`, same as above
   * `didUpdate` runs after the template has re-rendered and the DOM is
     now up to date.
   * `didRender`, same as above.
   
   Note that a component is re-rendered whenever:
   
   1. any of its attributes change
   2. `component.set()` is called
   3. `component.rerender()` is called
   4. a property on a model or service used by the template has changed
      (including through computed properties).
   
   Because of the Glimmer engine, these re-renders are fast, and avoid
   unnecessary work.

   

   Tom Dale and Yehuda Katz authored and tilde-engineering committed May 12, 2015
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