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f28f0694f2
feat: the `tween.group(group)` method now has a reciprocal `tween.remove()`
method that will remove a tween from its associated group, and unassociate the
group. `tween.group()` without an arg is no longer valid, see breaking changes
and migration below.
fix: when a tween is stopped before its end time, do not allow its update method
to continue, therefore preventing logic (f.e. repeat logic) from being
triggered
docs: improved the docs, adding some missing information, removing all examples
of the global `TWEEN` group which has been deprecated, and adding docs on how to
manage groups of tweens. Also updated samples to use `import` syntax for
importing Tween, avoiding the use of the `TWEEN` UMD global variable which has
been deprecated.
feat: A new `Group.allStopped()` method returns true if all tweens in
a group are not playing (i.e. stopped, and not paused), otherwise false.
Useful for stopping an animation loop once all tweens in a group have
finished their animation.
BREAKING:
- Tweens are no longer automatically added or removed from groups by default
when you call any Tween methods such as `start()`, `stop()`, or `pause()`, and
the `preserve` parameter to `Group.update()` now defaults to `true` and is
deprecated to be removed in a future major version.
- MIGRATION: To keep old behavior for a while, explicitly call
`group.update()` with `false` for the second parameter. To migrate forward, do
not rely on automatic add/remove of tweens, and instead add/remove tweens
to/from groups manually.
- `Group.update()` no longer returns a boolean indicating if all tweens
have been removed.
- MIGRATION: Don't rely on auto-add/remove to/from groups. This
boolean return was previously useful for stopping an animation loop
once all tweens were finished animating. Instead, use the new
`Group.allStopped()` method to check if all tweens in a group are stopped in
order to determine whether or not to continue an animation loop.
- The second `group` parameter to `Tween.constructor` now defaults to
`undefined` instead of the global `TWEEN` group. Additionally it
accepts a value of `true` to restore the old default behavior. The
`true` value is deprecated and will be removed in a future major
version.
- MIGRATION: For the time being the parameter can be set to `true` to restore
the old behavior. To migrate forward, use `tween.group(group)` or
`group.add(tween)` instead.
- The argless `tween.group()` signature has been removed.
- MIGRATION: Use `group.add(tween)` or `group.remove(tween)` instead.
`tween.group(TWEEN)`, `TWEEN.add(tween)`, and `TWEEN.remove(tween)` will also
work for now, but they are deprecated and will be removed in a future major
version.
- `Group.update`'s second parameter `preserve` defaults to `true` now, and is
deprecated to be removed in a future major version, at which point tweens of a
group will no longer be automatically added/remove to/from a group when calling
any Tween methods such as `start()`, `pause()`, or `stop()`.
- MIGRATION: For now, explicitly set the parameter to `false` to restore old
default behavior when calling `group.update()`. To migrate forward, do not
rely on the automatic add/remove behavior, and instead manually add or remove
tweens to or from groups.
- To make the fix for `tween.update()` to be a no-op for stopped tweens, we had
to break an undocumented feature that allowed tweens to move backward in time
(https://github.com/tweenjs/tween.js/pull/271).
- MIGRATION: To move tweens backward in time after they have already
completed, first call `tween.start(startTime)` then proceed to call
`tween.update(time)` in reverse order as before (see the unit test with "go
backward in time" in its name). Without calling `tween.start()` nothing will
happen because stopped/completed tweens will now always return early from
`update()`, as they are considered to be no longer running.