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import * as React from "react";
import { observer } from "mobx-react";
import { observable, action } from "mobx";
import { Doc } from "../../../../fields/Doc";
import { NumCast, StrCast } from "../../../../fields/Types";
import { DimUnit } from "./CollectionMultirowView";
import { UndoManager } from "../../../util/UndoManager";
interface ResizerProps {
height: number;
columnUnitLength(): number | undefined;
toTop?: Doc;
toBottom?: Doc;
}
const resizerOpacity = 1;
@observer
export default class ResizeBar extends React.Component<ResizerProps> {
@observable private isHoverActive = false;
@observable private isResizingActive = false;
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.isResizingActive = true;
this._resizeUndo = UndoManager.StartBatch("multcol resizing");
}
private onPointerMove = ({ movementY }: PointerEvent) => {
const { toTop: toTop, toBottom: 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);
}
}
}
private get isActivated() {
const { toTop, toBottom } = this.props;
if (toTop && toBottom) {
if (StrCast(toTop._dimUnit, "*") === DimUnit.Pixel && StrCast(toBottom._dimUnit, "*") === DimUnit.Pixel) {
return false;
}
return true;
} else if (toTop) {
if (StrCast(toTop._dimUnit, "*") === DimUnit.Pixel) {
return false;
}
return true;
} else if (toBottom) {
if (StrCast(toBottom._dimUnit, "*") === DimUnit.Pixel) {
return false;
}
return true;
}
return false;
}
@action
private onPointerUp = () => {
this.isResizingActive = false;
this.isHoverActive = false;
window.removeEventListener("pointermove", this.onPointerMove);
window.removeEventListener("pointerup", this.onPointerUp);
this._resizeUndo?.end();
this._resizeUndo = undefined;
}
render() {
return (
<div
className={"multiRowResizer"}
style={{
height: this.props.height,
opacity: this.isActivated && this.isHoverActive ? resizerOpacity : 0
}}
onPointerEnter={action(() => this.isHoverActive = true)}
onPointerLeave={action(() => !this.isResizingActive && (this.isHoverActive = false))}
>
<div className={"multiRowResizer-hdl"} onPointerDown={e => this.registerResizing(e)} />
</div>
);
}
}
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