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const GitBook = require('gitbook-core');
const { React } = GitBook;
/**
* Displays a progress bar (YouTube-like) at the top of container
* Based on https://github.com/lonelyclick/react-loading-bar/blob/master/src/Loading.jsx
*/
const LoadingBar = React.createClass({
propTypes: {
show: React.PropTypes.bool
},
getDefaultProps() {
return {
show: false
};
},
getInitialState() {
return {
size: 0,
disappearDelayHide: false, // when dispappear, first transition then display none
percent: 0,
appearDelayWidth: 0 // when appear, first display block then transition width
};
},
componentWillReceiveProps(nextProps) {
const { show } = nextProps;
if (show) {
this.show();
} else {
this.hide();
}
},
shouldComponentUpdate(nextProps, nextState) {
return true; // !shallowEqual(nextState, this.state)
},
show() {
let { size, percent } = this.state;
const appearDelayWidth = size === 0;
percent = calculatePercent(percent);
this.setState({
size: ++size,
appearDelayWidth,
percent
});
if (appearDelayWidth) {
setTimeout(() => {
this.setState({
appearDelayWidth: false
});
});
}
},
hide() {
let { size } = this.state;
if (--size < 0) {
this.setState({ size: 0 });
return;
}
this.setState({
size: 0,
disappearDelayHide: true,
percent: 1
});
setTimeout(() => {
this.setState({
disappearDelayHide: false,
percent: 0
});
}, 500);
},
getBarStyle() {
const { disappearDelayHide, appearDelayWidth, percent } = this.state;
return {
width: appearDelayWidth ? 0 : percent * 100 + '%',
display: disappearDelayHide || percent > 0 ? 'block' : 'none'
};
},
getShadowStyle() {
const { percent, disappearDelayHide } = this.state;
return {
display: disappearDelayHide || percent > 0 ? 'block' : 'none'
};
},
render() {
return (
<div className="LoadingBar">
<div className="LoadingBar-Bar" style={this.getBarStyle()}>
<div className="LoadingBar-Shadow"
style={this.getShadowStyle()}>
</div>
</div>
</div>
);
}
});
function calculatePercent(percent) {
percent = percent || 0;
// How much of remaining bar we advance
const progress = 0.1 + Math.random() * 0.3;
return percent + progress * (1 - percent);
}
module.exports = LoadingBar;
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