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environment: Handle reversed transition with 0 duration

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If a transition is reversed, the final property values will be the
same as before the transition. However this currently only works
correctly when we actually use a transition; to fix this with a
duration of 0, simply skip the set() call when the transition is
reversed.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/1042
This commit is contained in:
Florian Müllner 2020-02-22 16:35:32 +01:00 committed by Carlos Garnacho
parent 967a6ae44d
commit 2bb8e1be9b
1 changed files with 15 additions and 2 deletions
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17
js/ui/environment.js
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@ -111,6 +111,11 @@ function _easeActor(actor, params) {
autoReverse = params.autoReverse;
delete params.autoReverse;
// repeatCount doesn't include the initial iteration
const numIterations = repeatCount + 1;
// whether the transition should finish where it started
const isReversed = autoReverse && numIterations % 2 === 0;
if (params.mode != undefined)
actor.set_easing_mode(params.mode);
delete params.mode;
@ -122,7 +127,8 @@ function _easeActor(actor, params) {
let animatedProps = Object.keys(params).map(p => p.replace('_', '-', 'g'));
animatedProps.forEach(p => actor.remove_transition(p));
actor.set(params);
if (actor.get_easing_duration() > 0 || !isReversed)
actor.set(params);
actor.restore_easing_state();
let transition = animatedProps.map(p => actor.get_transition(p))
@ -161,6 +167,11 @@ function _easeActorProperty(actor, propName, target, params) {
autoReverse = params.autoReverse;
delete params.autoReverse;
// repeatCount doesn't include the initial iteration
const numIterations = repeatCount + 1;
// whether the transition should finish where it started
const isReversed = autoReverse && numIterations % 2 === 0;
// Copy Clutter's behavior for implicit animations, see
// should_skip_implicit_transition()
if (actor instanceof Clutter.Actor && !actor.mapped)
@ -174,7 +185,9 @@ function _easeActorProperty(actor, propName, target, params) {
if (duration == 0) {
let [obj, prop] = _getPropertyTarget(actor, propName);
obj[prop] = target;
if (!isReversed)
obj[prop] = target;
Meta.disable_unredirect_for_display(global.display);
callback(true);