React 文档没有任何关于处理不是 CSS 转换的动画的内容,例如滚动位置和 SVG 属性的动画。
至于 CSS 过渡,有一个附加组件。
/**
* @jsx React.DOM
*/
function animate(duration, onStep) {
var start = Date.now();
var timer = {id: 0};
(function loop() {
timer.id = requestAnimationFrame(function() {
var diff = Date.now() - start;
var fraction = diff / duration;
onStep(fraction);
if (diff < duration) {
loop();
}
});
})();
return timer;
}
function lerp(low, high, fraction) {
return low + (high - low) * fraction;
}
var App = React.createClass({
getInitialState: function() {
return {x: 0}
},
move: function(i) {
this.setState({x: this.state.x + i * 100});
},
render: function() {
return <div className="ShowerItem">
<p>
<button onClick={this.move.bind(this, -1)}>Left</button>
<button onClick={this.move.bind(this, 1)}>Right</button>
</p>
<svg><Dot x={this.state.x}/></svg>
</div>;
}
});
var Dot = React.createClass({
getInitialState: function() {
return {
x: 0,
final: 0
};
},
timer: null,
render: function() {
var from = this.state.x;
var to = this.props.x;
if (to !== this.state.final) {
this.state.final = to;
if (this.timer) {
cancelAnimationFrame(this.timer.id);
}
this.timer = animate(500, function(fraction) {
var x = lerp(from, to, fraction);
if (fraction >= 1) {
this.setState({
value: to
});
this.timer = null;
} else {
this.setState({x: x});
}
}.bind(this))
}
return <circle r="10" cy="10" cx={this.state.x + 10}/>
}
});
React.renderComponent(
<App/>,
document.body
);
有没有更有效的动画制作方法?
它的代码架构对吗?
CSS Transitions 插件在这里没有帮助,因为我不使用 CSS。