CSS/Vue.js synchronize animation reset with ref value change - css

Question

I want to create an animation that fades between 3 states. To store these states (that contain an image and some text), I've created an array of objects (uploadSteps). I increment the index of this array at a specific interval to create an animation.
My problem comes with CSS, I would like to create a fade-out/fade-in effect between each step, so that the transition is more smooth. It works most of the time but sometimes, after a refresh and for the first transition, I think the CSS animation is restarted before the state is changed. I wasn't able to reproduce it constantly so far.
What it does => Image fade-in -> Image 1 -> Image 1 fade-Out -> Image 1 -> Image 2 fade-in
What I want => Image fade-in -> Image 1 -> Image 1 fade-Out -> Image 2 fade-in
If you pay attention you can see that there's kind of a blink effect at the transition between image 1 and 2. What could I do to solve this ? Help appreciated !
PS: I've included some videos to illustrate my issue
https://streamable.com/4aigjq - Animation KO
https://streamable.com/umu3nj - Animation OK
<template>
<div class="screenshot-upload-processing-container">
<div class="image-container">
<img
ref="imageRef"
:src="
currentStep ? $requireImage(currentStep.imagePath).toString() : ''
"
:alt="currentStep.text"
class="image"
/>
</div>
<div class="centered-row">
<span ref="textRef" class="text">{{
currentStep ? currentStep.text : ''
}}</span>
</div>
</div>
</template>
<script lang="ts">
import {
computed,
defineComponent,
onBeforeUnmount,
ref,
} from '#nuxtjs/composition-api';
export default defineComponent({
name: 'ScreenshotUploadProcessing',
setup() {
const stepNumber = ref(0);
const timer = ref<NodeJS.Timeout | null>(null);
const imageRef = ref<HTMLImageElement | null>(null);
const textRef = ref<HTMLSpanElement | null>(null);
const uploadSteps = computed(() => {
return [
{
imagePath: 'image1.svg',
text: 'Text 1',
},
{
imagePath: 'image2.svg',
text: 'Text 2',
},
{
imagePath: 'image3.svg',
text: 'Text 3',
},
];
});
const resetAnimations = () => {
const image = imageRef.value;
const text = textRef.value;
if (image) {
image.style.animation = 'none';
void image.offsetHeight;
image.style.animation = '';
}
if (text) {
text.style.animation = 'none';
void text.offsetHeight;
text.style.animation = '';
}
};
const updateStepNumber = () => {
timer.value = setInterval(() => {
if (stepNumber.value === uploadSteps.value.length - 1) {
stepNumber.value = 0;
} else {
stepNumber.value++;
}
resetAnimations();
}, 3000);
};
onBeforeUnmount(() => {
clearInterval(timer.value as NodeJS.Timeout);
});
const currentStep = computed(() => uploadSteps.value[stepNumber.value]);
updateStepNumber();
return {
stepNumber,
currentStep,
imageRef,
textRef,
uploadSteps,
};
},
});
</script>
<style lang="scss" scoped>
#keyframes fade {
0%,
100% {
opacity: 0;
}
40%,
60% {
opacity: 1;
}
}
.screenshot-upload-processing-container {
display: flex;
flex-direction: column;
height: 100%;
}
.image {
animation: fade 3s linear;
}
.image-container {
display: flex;
align-items: center;
justify-content: center;
height: 27rem;
margin-top: 10.3rem;
}
.centered-row {
display: flex;
align-items: center;
justify-content: center;
margin-top: $spacing-xl;
}
.text {
#extend %text-gradient-1;
animation: fade 3s linear;
font-weight: $font-weight-medium;
}
</style>