animate.js
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import { canIUseAnimate } from '../common/version';
import { getRect } from '../common/utils';
function useAnimate(context, expanded, mounted, height) {
const selector = '.van-collapse-item__wrapper';
if (expanded) {
context.animate(
selector,
[
{ height: 0, ease: 'ease-in-out', offset: 0 },
{ height: `${height}px`, ease: 'ease-in-out', offset: 1 },
{ height: `auto`, ease: 'ease-in-out', offset: 1 },
],
mounted ? 300 : 0,
() => {
context.clearAnimation(selector);
}
);
return;
}
context.animate(
selector,
[
{ height: `${height}px`, ease: 'ease-in-out', offset: 0 },
{ height: 0, ease: 'ease-in-out', offset: 1 },
],
300,
() => {
context.clearAnimation(selector);
}
);
}
function useAnimation(context, expanded, mounted, height) {
const animation = wx.createAnimation({
duration: 0,
timingFunction: 'ease-in-out',
});
if (expanded) {
if (height === 0) {
animation.height('auto').top(1).step();
} else {
animation
.height(height)
.top(1)
.step({
duration: mounted ? 300 : 1,
})
.height('auto')
.step();
}
context.setData({
animation: animation.export(),
});
return;
}
animation.height(height).top(0).step({ duration: 1 }).height(0).step({
duration: 300,
});
context.setData({
animation: animation.export(),
});
}
export function setContentAnimate(context, expanded, mounted) {
getRect(context, '.van-collapse-item__content')
.then((rect) => rect.height)
.then((height) => {
canIUseAnimate()
? useAnimate(context, expanded, mounted, height)
: useAnimation(context, expanded, mounted, height);
});
}