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import { action, computed, makeObservable, reaction } from 'mobx';
import { observer } from 'mobx-react';
import * as React from 'react';
import { NumCast, StrCast } from '../../../fields/Types';
import { TraceMobx } from '../../../fields/util';
import { DocUtils } from '../../documents/DocUtils';
import { DocumentType } from '../../documents/DocumentTypes';
import { Docs } from '../../documents/Documents';
import { undoBatch, UndoManager } from '../../util/UndoManager';
import { ViewBoxBaseComponent } from '../DocComponent';
import { StyleProp } from '../StyleProp';
import { DocumentView } from './DocumentView';
import './EquationBox.scss';
import { FieldView, FieldViewProps } from './FieldView';
import EquationEditor from './formattedText/EquationEditor';
import { FormattedTextBox } from './formattedText/FormattedTextBox';
@observer
export class EquationBox extends ViewBoxBaseComponent<FieldViewProps>() {
public static LayoutString(fieldKey: string) {
return FieldView.LayoutString(EquationBox, fieldKey);
}
_ref: React.RefObject<EquationEditor> = React.createRef();
_liveTextUndo: UndoManager.Batch | undefined; // captured undo batch when typing a new text note into a collection
constructor(props: FieldViewProps) {
super(props);
makeObservable(this);
}
componentDidMount() {
this._props.setContentViewBox?.(this);
if (DocumentView.SelectOnLoad === this.Document && (!DocumentView.LightboxDoc() || DocumentView.LightboxContains(this.DocumentView?.()))) {
this._liveTextUndo = FormattedTextBox.LiveTextUndo;
FormattedTextBox.LiveTextUndo = undefined;
this._props.select(false);
this._ref.current?.mathField.focus();
this.dataDoc.text === 'x' && this._ref.current?.mathField.select();
DocumentView.SetSelectOnLoad(undefined);
}
reaction(
() => this._props.isSelected(),
selected => {
if (this._ref.current) {
if (selected) (this._ref.current.element.current?.children[0] as HTMLElement).addEventListener('keydown', this.keyPressed, true);
else (this._ref.current.element.current?.children[0] as HTMLElement).removeEventListener('keydown', this.keyPressed);
}
},
{ fireImmediately: true }
);
}
@computed get fontSize() { return this._props.styleProvider?.(this.layoutDoc, this._props, StyleProp.FontSize) as string; } // prettier-ignore
@computed get fontColor() { return this._props.styleProvider?.(this.layoutDoc, this._props, StyleProp.FontColor) as string; } // prettier-ignore
@action
keyPressed = (e: KeyboardEvent) => {
if (e.key === 'Enter') {
const nextEq = Docs.Create.EquationDocument(e.shiftKey ? StrCast(this.dataDoc.text) : '', {
title: '# math',
_width: NumCast(this.layoutDoc._width),
_height: NumCast(this.layoutDoc._height),
nativeHeight: NumCast(this.dataDoc.nativeHeight),
nativeWidth: NumCast(this.dataDoc.nativeWidth),
x: NumCast(this.layoutDoc.x),
y: NumCast(this.layoutDoc.y) + NumCast(this.Document._height) + 10,
backgroundColor: StrCast(this.Document.backgroundColor),
color: StrCast(this.Document.color),
fontSize: this.fontSize,
});
DocumentView.SetSelectOnLoad(nextEq);
this._props.addDocument?.(nextEq);
e.stopPropagation();
}
if (e.key === 'Tab') {
const graph = Docs.Create.FunctionPlotDocument([this.Document], {
x: NumCast(this.layoutDoc.x) + NumCast(this.layoutDoc._width),
y: NumCast(this.layoutDoc.y),
_width: 400,
_height: 300,
backgroundColor: 'white',
});
const link = DocUtils.MakeLink(this.Document, graph, { layout_isSvg: true, link_relationship: 'function', link_description: 'input' });
this._props.addDocument?.(graph);
link && this._props.addDocument?.(link);
e.stopPropagation();
}
if (e.key === 'Backspace' && !this.dataDoc.text) this._props.removeDocument?.(this.Document);
};
@undoBatch
onChange = (str: string) => {
this.dataDoc.text = str;
};
updateSize = (mathSpan: HTMLSpanElement) => {
const style = getComputedStyle(mathSpan);
const styleWidth = Number(style.width.replace('px', '') || 0);
const styleHeight = Number(style.height.replace('px', '') || 0);
const mathWidth = Math.max(35, NumCast(this.layoutDoc.xMargin) * 2 + styleWidth);
const mathHeight = Math.max(20, NumCast(this.layoutDoc.yMargin) * 2 + styleHeight);
const nScale = !this.dataDoc.nativeWidth ? 1
: (prevNwidth => { // if equation has been scaled then editing the expression must also edit the native dimensions to keep the aspect ratio
[this.dataDoc.nativeWidth, this.dataDoc.nativeHeight] = [mathWidth, mathHeight];
return NumCast(this.layoutDoc._width) / prevNwidth;
})(NumCast(this.dataDoc.nativeWidth)); // prettier-ignore
this.layoutDoc._width = mathWidth * nScale;
this.layoutDoc._height = mathHeight * nScale;
};
render() {
TraceMobx();
const scale = this._props.NativeDimScaling?.() || 1;
return (
<div
ref={r => r && this._ref.current?.element.current && this.updateSize(this._ref.current?.element.current)}
className="equationBox-cont"
onKeyDown={e => e.stopPropagation()}
onPointerDown={e => !e.ctrlKey && e.stopPropagation()}
onBlur={() => this._liveTextUndo?.end()}
style={{
transform: `scale(${scale})`,
minWidth: `${100 / scale}%`,
height: `${100 / scale}%`,
pointerEvents: !this._props.isContentActive() ? 'none' : undefined,
fontSize: this.fontSize,
color: this.fontColor,
paddingLeft: NumCast(this.layoutDoc.xMargin),
paddingRight: NumCast(this.layoutDoc.xMargin),
paddingTop: NumCast(this.layoutDoc.yMargin),
paddingBottom: NumCast(this.layoutDoc.yMargin),
}}>
<EquationEditor ref={this._ref} value={StrCast(this.dataDoc.text, '')} spaceBehavesLikeTab onChange={this.onChange} autoCommands="pi theta sqrt sum prod alpha beta gamma rho" autoOperatorNames="sin cos tan" />
</div>
);
}
}
Docs.Prototypes.TemplateMap.set(DocumentType.EQUATION, {
layout: { view: EquationBox, dataField: 'text' },
options: {
acl: '',
_xMargin: 10,
_yMargin: 10,
fontSize: '14px',
_nativeWidth: 40,
_nativeHeight: 40,
_layout_reflowHorizontal: false,
_layout_reflowVertical: false,
_layout_nativeDimEditable: false,
layout_hideDecorationTitle: true,
systemIcon: 'BsCalculatorFill',
}, // systemIcon: 'BsSuperscript' + BsSubscript
});
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