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import { MathTableCell, MathTableElement, MathTableRow } from 'common/models/elements/input-elements/math-table';
import {
Component, EventEmitter, Input, OnInit, Output
} from '@angular/core';
import { ElementComponent } from 'common/directives/element-component.directive';
import { ValueChangeElement } from 'common/models/elements/element';
@Component({
selector: 'aspect-math-table',
template: `
<div class="wrapper">
<table [class.multiplication]="elementModel.operation === 'multiplication'"
[style.color]="elementModel.styling.fontColor"
[style.background-color]="elementModel.styling.backgroundColor"
[style.font-size.px]="elementModel.styling.fontSize"
[style.font-weight]="elementModel.styling.bold ? 'bold' : ''"
[style.font-style]="elementModel.styling.italic ? 'italic' : ''"
[style.text-decoration]="elementModel.styling.underline ? 'underline' : ''">
<tr *ngFor="let row of tableModel"
[style.height.px]="row.cells.length && row.cells[0].isSmallCell ? elementModel.styling.fontSize * 1.5 :
elementModel.styling.fontSize * 2"
[style.font-size]="row.cells.length && row.cells[0].isSmallCell && '70%'">
<td *ngFor="let cell of row.cells" [attr.contenteditable]="cell.isEditable"
[style.width.px]="elementModel.styling.fontSize * 2"
[class.strike-through]="cell.isCrossedOut"
[textContent]="cell.value"
(paste)="$event.preventDefault()"
(keydown)="onCharEnter(cell, $event)"
(dblclick)="(cell.isSmallCell || cell.canBeCrossedOut) && cell.value !== '' && toggleStrikeThrough(cell)">
</td>
</tr>
</table>
<button *ngIf="elementModel.operation === 'multiplication'"
[matTooltip]="'weitere Zeile einfügen'"
[style.margin-bottom.px]="elementModel.styling.fontSize * 2.5"
[style.width.px]="elementModel.styling.fontSize * 2.5"
[style.height.px]="elementModel.styling.fontSize * 2.5"
(click)="addRow()">
<mat-icon>add</mat-icon>
</button>
<button *ngIf="elementModel.operation === 'multiplication'"
[matTooltip]="'letzte Zeile entfernen'"
[disabled]="tableModel.length == 4"
[style.margin-bottom.px]="elementModel.styling.fontSize * 2.5"
[style.width.px]="elementModel.styling.fontSize * 2.5"
[style.height.px]="elementModel.styling.fontSize * 2.5"
(click)="removeRow()">
<mat-icon>delete</mat-icon>
</button>
</div>
`,
styles: [
'.wrapper {display: flex; flex-direction: row;}',
'.wrapper button {align-self: end; border-radius: 50%; margin-left: 10px;}',
'table {border-spacing: 0; border-collapse: collapse;}',
'td {border: 1px solid grey; text-align: center; caret-color: transparent;}',
'td.strike-through {text-decoration: line-through; text-decoration-thickness: 3px;}',
'td:focus {background-color: #00606425; outline: unset;}',
'table tr:last-child {border-top: 3px solid black;}',
'table.multiplication tr:first-child {border-bottom: 3px solid black;}'
]
})
export class MathTableComponent extends ElementComponent implements OnInit {
@Input() elementModel!: MathTableElement;
@Output() elementValueChanged = new EventEmitter<ValueChangeElement>();
@Input() tableModel: MathTableRow[] = [];
ngOnInit() {
if (!this.tableModel.length) this.createTableModel();
}
refresh(): void {
this.createTableModel();
}
private createTableModel(): void {
switch (this.elementModel.operation) {
case 'addition': {
this.tableModel = this.createAdditionModel();
break;
}
case 'subtraction': {
this.tableModel = this.createSubstractionModel();
break;
}
case 'multiplication': {
this.tableModel = this.createMultiplicationModel();
break;
}
default:
throw new Error(`Unknown math operation: ${this.elementModel.operation}`);
}
}
private createAdditionModel(): MathTableRow[] {
const operatorOffset = 1; // offset for operatorChar
const width = Math.max(
...this.elementModel.terms.map(term => term.length + operatorOffset),
this.elementModel.result.length
);
return [
MathTableComponent.createHelperRow(width),
...this.elementModel.terms
.map((term: string, i: number) => MathTableComponent.createNormalRow(
term, width - operatorOffset, i > 0 ? '+' : ' '
)),
MathTableComponent.createResultRow(this.elementModel.result, width)
];
}
private createSubstractionModel(): MathTableRow[] {
const operatorOffset = 1; // offset for operatorChar
const width = Math.max(
...this.elementModel.terms.map(term => term.length + operatorOffset),
this.elementModel.result.length
);
return [
MathTableComponent.createHelperRow(width),
MathTableComponent.createHelperRow(width),
...this.elementModel.terms
.map((term: string, i: number) => MathTableComponent.createNormalRow(
term, width - operatorOffset, i > 0 ? '−' : ' ', i > 0
)),
MathTableComponent.createResultRow(this.elementModel.result, width)
];
}
private createMultiplicationModel(): MathTableRow[] {
const width = Math.max(this.elementModel.terms[0].length + this.elementModel.terms[1].length + 3,
this.elementModel.result.length);
return [
MathTableComponent.createMultiplicationRow(this.elementModel.terms[0], this.elementModel.terms[1], width),
MathTableComponent.createNormalRow('', width),
MathTableComponent.createHelperRow(width),
MathTableComponent.createResultRow(this.elementModel.result, width)
];
}
static createMultiplicationRow(term1: string, term2: string, width: number): MathTableRow {
return {
rowType: 'normal',
cells: [
...Array(width - (term1.length + term2.length + 1))
.fill({ value: '' }),
...term1.split('').map(char => ({ value: char })),
{ value: '•' },
...term2.split('').map(char => ({ value: char }))
]
};
}
private static createHelperRow(width: number): MathTableRow {
return {
rowType: 'helper',
cells: [...Array(width).fill(undefined).map(() => ({ value: '', isSmallCell: true, isEditable: true }))]
};
}
/* Empty cells have to have an extra map to ensure new object refs. */
private static createNormalRow(term: string, width: number, operatorChar?: string,
isStrikable: boolean = false): MathTableRow {
return {
rowType: 'normal',
cells: [
...operatorChar ? [{ value: operatorChar }] : [],
...Array(width - term.length).fill(undefined)
.map(() => ({ value: '', isEditable: term === '' })),
...term.split('').map(char => ({
value: char === '_' ? ' ' : char, // underscore acts as space alternative
isEditable: char === ' ' || char === '_',
canBeCrossedOut: isStrikable
}))
]
};
}
private static createResultRow(term: string, width: number): MathTableRow {
return {
rowType: 'result',
cells: [
...Array(width - term.length).fill(undefined)
.map(() => ({ value: '', isEditable: term === '' })),
...term.split('').map(char => ({
value: char === '_' ? ' ' : char, // underscore acts as space alternative
isEditable: char === ' ' || char === '_'
}))
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]
};
}
addRow(): void {
const width = this.elementModel.terms[0].length + this.elementModel.terms[1].length + 3;
this.tableModel.splice(
this.tableModel.length - 2,
0,
MathTableComponent.createNormalRow('', width)
);
this.emitModel();
}
removeRow() {
this.tableModel.splice(this.tableModel.length - 3, 1);
this.emitModel();
}
onCharEnter(cell: MathTableCell, event: KeyboardEvent) {
if (event.key === 'Tab') return; // allow normal Tab usage
event.preventDefault();
if (['Backspace', 'Delete'].includes(event.key)) {
cell.value = '';
(event.target as HTMLElement).textContent = '';
cell.isCrossedOut = false;
}
const allowedKeys = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '0'];
if (this.elementModel.operation === 'multiplication' && !cell.isSmallCell) {
allowedKeys.push('+', '-', '*', ':', '/');
}
if (!allowedKeys.includes(event.key)) return;
if (cell.isSmallCell && cell.value.length === 1) {
cell.value += event.key;
} else if (event.key === '*') { // replace star by custom division sign
cell.value = '•';
} else if (event.key === '/') { // also allow slash for division sign
cell.value = ':';
} else if (event.key === '-') { // use longer minus char
cell.value = '−';
} else {
cell.value = event.key;
}
this.emitModel();
}
toggleStrikeThrough(cell: MathTableCell) {
cell.isCrossedOut = !cell.isCrossedOut;
this.emitModel();
}
emitModel(): void {
this.elementValueChanged.emit({ id: this.elementModel.id, value: this.tableModel });
}
}