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Update transitioning state example to use greensock #1471

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Mar 8, 2018
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Update transitioning state example to use greensock #1471

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60 changes: 20 additions & 40 deletions src/v2/guide/transitioning-state.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,10 @@ All of these are either already stored as raw numbers or can be converted into n

## Animating State with Watchers

Watchers allow us to animate changes of any numerical property into another property. That may sound complicated in the abstract, so let's dive into an example using [Tween.js](https://github.com/tweenjs/tween.js):
Watchers allow us to animate changes of any numerical property into another property. That may sound complicated in the abstract, so let's dive into an example using [GreenSock](https://greensock.com/):

``` html
<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.3/TweenMax.min.js"></script>

<div id="animated-number-demo">
<input v-model.number="number" type="number" step="20">
Expand All @@ -31,33 +31,23 @@ new Vue({
el: '#animated-number-demo',
data: {
number: 0,
animatedNumber: 0
tweenedNumber: 0
},
computed: {
animatedNumber: function() {
return this.tweenedNumber.toFixed(0);
}
},
watch: {
number: function(newValue, oldValue) {
var vm = this
function animate () {
if (TWEEN.update()) {
requestAnimationFrame(animate)
}
}

new TWEEN.Tween({ tweeningNumber: oldValue })
.easing(TWEEN.Easing.Quadratic.Out)
.to({ tweeningNumber: newValue }, 500)
.onUpdate(function () {
vm.animatedNumber = this.tweeningNumber.toFixed(0)
})
.start()

animate()
number: function(newValue) {
TweenLite.to(this.$data, 0.5, { tweenedNumber: newValue });
}
}
})
```

{% raw %}
<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/1.20.3/TweenMax.min.js"></script>
<div id="animated-number-demo" class="demo">
<input v-model.number="number" type="number" step="20">
<p>{{ animatedNumber }}</p>
Expand All @@ -67,33 +57,23 @@ new Vue({
el: '#animated-number-demo',
data: {
number: 0,
animatedNumber: 0
tweenedNumber: 0
},
computed: {
animatedNumber: function() {
return this.tweenedNumber.toFixed(0);
}
},
watch: {
number: function(newValue, oldValue) {
var vm = this
function animate () {
if (TWEEN.update()) {
requestAnimationFrame(animate)
}
}

new TWEEN.Tween({ tweeningNumber: oldValue })
.easing(TWEEN.Easing.Quadratic.Out)
.to({ tweeningNumber: newValue }, 500)
.onUpdate(function () {
vm.animatedNumber = this.tweeningNumber.toFixed(0)
})
.start()

animate()
number: function(newValue) {
TweenLite.to(this.$data, 0.5, { tweenedNumber: newValue });
}
}
})
</script>
{% endraw %}

When you update the number, the change is animated below the input. This makes for a nice demo, but what about something that isn't directly stored as a number, like any valid CSS color for example? Here's how we could accomplish this with the addition of [Color.js](https://github.com/brehaut/color-js):
When you update the number, the change is animated below the input. This makes for a nice demo, but what about something that isn't directly stored as a number, like any valid CSS color for example? Here's how we could accomplish this with [Tween.js](https://github.com/tweenjs/tween.js) and [Color.js](https://github.com/brehaut/color-js):

``` html
<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
Expand Down