Mutate crossfade start/end drawables#572
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colinrtwhite
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Nov 3, 2020
| * NOTE: The animation can only be executed once as the [start] drawable is dereferenced at the end of the transition. | ||
| * | ||
| * @param start The [Drawable] to crossfade from. | ||
| * @param start The [Drawable] to crossfade from. Will be mutated to prevent modifying alpha of original drawable |
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I don't think we need to mention mutation in the docs.
colinrtwhite
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Nov 3, 2020
| class CrossfadeDrawable @JvmOverloads constructor( | ||
| private var start: Drawable?, | ||
| start: Drawable?, | ||
| private val end: Drawable?, |
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We should probably mutate end as well since it could be loaded from resources.
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Yep, didn't think about that! Since we can provide something like error placeholder. Tested it in sample, same bug
#571 (comment)
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Fixed. Not sure if tests are good enough, they are testing drawable changes, but with a bit of a hack - since percent of animation is tied to SystemClock and can't be influenced directly.
colinrtwhite
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Nov 3, 2020
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| this.start = start?.mutate() | ||
| start?.callback = this | ||
| end?.callback = this |
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Should this be this.start and this.end? drawable.mutate is supposed to return the same drawable, but there's nothing to prevent a bad drawable from returning a new drawable.
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Thanks for finding + fixing this! |
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…es (coil-kt#571) Remove mention of drawable mutation from CrossfadeDrawable doc (coil-kt#571)
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IljaKosynkin
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Nov 6, 2020
* Add failing test for crossfade drawable alpha bug (coil-kt#571) * Change CrossfadeDrawable constructor to mutate start drawable (coil-kt#571) * Add test for both start/end drawables in CrossfadeDrawableTest (coil-kt#571) * Change CrossfadeDrawable constructor to mutate both start/end drawables (coil-kt#571) Remove mention of drawable mutation from CrossfadeDrawable doc (coil-kt#571)
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* Add failing test for crossfade drawable alpha bug (#571) * Change CrossfadeDrawable constructor to mutate start drawable (#571) * Add test for both start/end drawables in CrossfadeDrawableTest (#571) * Change CrossfadeDrawable constructor to mutate both start/end drawables (#571) Remove mention of drawable mutation from CrossfadeDrawable doc (#571)
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Fixes #571