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import React from 'react';
import PropTypes from 'prop-types';
import bindAll from 'lodash.bindall';
import AudioSelectorComponent from '../components/audio-trimmer/audio-selector.jsx';
import { getEventXY } from '../lib/touch-utils';
import DragRecognizer from '../lib/drag-recognizer';
const MIN_LENGTH = 0.01;
const MIN_DURATION = 500;
class AudioSelector extends React.Component {
constructor(props) {
super(props);
bindAll(this, [
'handleNewSelectionMouseDown',
'handleTrimStartMouseDown',
'handleTrimEndMouseDown',
'handleTrimStartMouseMove',
'handleTrimEndMouseMove',
'handleTrimStartMouseUp',
'handleTrimEndMouseUp',
'storeRef'
]);
this.state = {
trimStart: props.trimStart,
trimEnd: props.trimEnd
};
this.clickStartTime = 0;
this.trimStartDragRecognizer = new DragRecognizer({
onDrag: this.handleTrimStartMouseMove,
onDragEnd: this.handleTrimStartMouseUp,
touchDragAngle: 90,
distanceThreshold: 0
});
this.trimEndDragRecognizer = new DragRecognizer({
onDrag: this.handleTrimEndMouseMove,
onDragEnd: this.handleTrimEndMouseUp,
touchDragAngle: 90,
distanceThreshold: 0
});
}
componentWillReceiveProps(newProps) {
const { trimStart, trimEnd } = this.props;
if (newProps.trimStart === trimStart && newProps.trimEnd === trimEnd) return;
this.setState({
trimStart: newProps.trimStart,
trimEnd: newProps.trimEnd
});
}
clearSelection() {
this.props.onSetTrim(null, null);
}
handleNewSelectionMouseDown(e) {
const { width, left } = this.containerElement.getBoundingClientRect();
this.initialTrimEnd = (getEventXY(e).x - left) / width;
this.initialTrimStart = this.initialTrimEnd;
this.props.onSetTrim(this.initialTrimStart, this.initialTrimEnd);
this.clickStartTime = Date.now();
this.containerSize = width;
this.trimEndDragRecognizer.start(e);
e.preventDefault();
}
handleTrimStartMouseMove(currentOffset, initialOffset) {
const dx = (currentOffset.x - initialOffset.x) / this.containerSize;
const newTrim = Math.max(0, Math.min(1, this.initialTrimStart + dx));
if (newTrim > this.initialTrimEnd) {
this.setState({
trimStart: this.initialTrimEnd,
trimEnd: newTrim
});
} else {
this.setState({
trimStart: newTrim,
trimEnd: this.initialTrimEnd
});
}
}
handleTrimEndMouseMove(currentOffset, initialOffset) {
const dx = (currentOffset.x - initialOffset.x) / this.containerSize;
const newTrim = Math.min(1, Math.max(0, this.initialTrimEnd + dx));
if (newTrim < this.initialTrimStart) {
this.setState({
trimStart: newTrim,
trimEnd: this.initialTrimStart
});
} else {
this.setState({
trimStart: this.initialTrimStart,
trimEnd: newTrim
});
}
}
handleTrimStartMouseUp() {
this.props.onSetTrim(this.state.trimStart, this.state.trimEnd);
}
handleTrimEndMouseUp() {
// If the selection was made quickly (tooFast) and is small (tooShort),
// deselect instead. This allows click-to-deselect even if you drag
// a little bit by accident. It also allows very quickly making a
// selection, as long as it is above a minimum length.
const tooFast = (Date.now() - this.clickStartTime) < MIN_DURATION;
const tooShort = (this.state.trimEnd - this.state.trimStart) < MIN_LENGTH;
if (tooFast && tooShort) {
this.clearSelection();
} else {
this.props.onSetTrim(this.state.trimStart, this.state.trimEnd);
}
}
handleTrimStartMouseDown(e) {
this.containerSize = this.containerElement.getBoundingClientRect().width;
this.trimStartDragRecognizer.start(e);
this.initialTrimStart = this.props.trimStart;
this.initialTrimEnd = this.props.trimEnd;
e.stopPropagation();
e.preventDefault();
}
handleTrimEndMouseDown(e) {
this.containerSize = this.containerElement.getBoundingClientRect().width;
this.trimEndDragRecognizer.start(e);
this.initialTrimEnd = this.props.trimEnd;
this.initialTrimStart = this.props.trimStart;
e.stopPropagation();
e.preventDefault();
}
storeRef(el) {
this.containerElement = el;
}
render() {
return (
<AudioSelectorComponent
containerRef={this.storeRef}
playhead={this.props.playhead}
trimEnd={this.state.trimEnd}
trimStart={this.state.trimStart}
onNewSelectionMouseDown={this.handleNewSelectionMouseDown}
onTrimEndMouseDown={this.handleTrimEndMouseDown}
onTrimStartMouseDown={this.handleTrimStartMouseDown}
/>
);
}
}
AudioSelector.propTypes = {
onSetTrim: PropTypes.func,
playhead: PropTypes.number,
trimEnd: PropTypes.number,
trimStart: PropTypes.number
};
export default AudioSelector;
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