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import { action } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import { Doc } from '../../../../fields/Doc';
import { NumCast, StrCast } from '../../../../fields/Types';
import { UndoManager } from '../../../util/UndoManager';
import { StyleProp } from '../../StyleProp';
import { StyleProviderFuncType } from '../../nodes/FieldView';
import { DimUnit } from './CollectionMultirowView';
interface ResizerProps {
height: number;
styleProvider?: StyleProviderFuncType;
isContentActive?: () => boolean | undefined;
columnUnitLength(): number | undefined;
toTop?: Doc;
toBottom?: Doc;
}
@observer
export default class ResizeBar extends React.Component<ResizerProps> {
private _resizeUndo?: UndoManager.Batch;
@action
private registerResizing = (e: React.PointerEvent<HTMLDivElement>) => {
e.stopPropagation();
e.preventDefault();
window.removeEventListener('pointermove', this.onPointerMove);
window.removeEventListener('pointerup', this.onPointerUp);
window.addEventListener('pointermove', this.onPointerMove);
window.addEventListener('pointerup', this.onPointerUp);
this._resizeUndo = UndoManager.StartBatch('multcol resizing');
};
private onPointerMove = ({ movementY }: PointerEvent) => {
const { toTop, toBottom, columnUnitLength } = this.props;
const movingDown = movementY > 0;
const toNarrow = movingDown ? toBottom : toTop;
const toWiden = movingDown ? toTop : toBottom;
const unitLength = columnUnitLength();
if (unitLength) {
if (toNarrow) {
const scale = StrCast(toNarrow._dimUnit, '*') === DimUnit.Ratio ? unitLength : 1;
toNarrow._dimMagnitude = Math.max(0.05, NumCast(toNarrow._dimMagnitude, 1) - Math.abs(movementY) / scale);
}
if (toWiden) {
const scale = StrCast(toWiden._dimUnit, '*') === DimUnit.Ratio ? unitLength : 1;
toWiden._dimMagnitude = Math.max(0.05, NumCast(toWiden._dimMagnitude, 1) + Math.abs(movementY) / scale);
}
}
};
@action
private onPointerUp = () => {
window.removeEventListener('pointermove', this.onPointerMove);
window.removeEventListener('pointerup', this.onPointerUp);
this._resizeUndo?.end();
this._resizeUndo = undefined;
};
render() {
return (
<div
className="multiRowResizer"
style={{
pointerEvents: this.props.isContentActive?.() ? 'all' : 'none',
height: this.props.height,
backgroundColor: !this.props.isContentActive?.() ? '' : (this.props.styleProvider?.(undefined, undefined, StyleProp.WidgetColor) as string),
}}>
<div className="multiRowResizer-hdl" onPointerDown={e => this.registerResizing(e)} />
</div>
);
}
}
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