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import React = require("react");
import { observable, action } from "mobx";
import { observer } from "mobx-react";
import { InkStrokeProperties } from "./InkStrokeProperties";
import { setupMoveUpEvents, emptyFunction } from "../../Utils";
import { UndoManager } from "../util/UndoManager";
import { InkData, HandlePoint, HandleLine } from "../../fields/InkField";
import { Transform } from "../util/Transform";
import { Doc } from "../../fields/Doc";
import { listSpec } from "../../fields/Schema";
import { List } from "../../fields/List";
import { Cast } from "../../fields/Types";
export interface InkHandlesProps {
inkDoc: Doc;
data: InkData;
format: number[];
ScreenToLocalTransform: () => Transform;
}
@observer
export class InkHandles extends React.Component<InkHandlesProps> {
/**
* Handles the movement of a selected handle point when the user clicks and drags.
* @param handleNum The index of the currently selected handle point.
*/
onHandleDown = (e: React.PointerEvent, handleIndex: number): void => {
if (InkStrokeProperties.Instance) {
InkStrokeProperties.Instance.moveControl(0, 0, 1);
const controlUndo = UndoManager.StartBatch("DocDecs set radius");
const screenScale = this.props.ScreenToLocalTransform().Scale;
const order = handleIndex % 4;
const oppositeHandleIndex = order === 1 ? handleIndex - 3 : handleIndex + 3;
const controlIndex = order === 1 ? handleIndex - 1 : handleIndex + 2;
document.addEventListener("keydown", (e: KeyboardEvent) => this.onBreakTangent(e, controlIndex), true);
setupMoveUpEvents(this, e, (e: PointerEvent, down: number[], delta: number[]) => {
InkStrokeProperties.Instance?.moveHandle(-delta[0] * screenScale, -delta[1] * screenScale, handleIndex, oppositeHandleIndex, controlIndex);
return false;
}, () => controlUndo?.end(), emptyFunction
);
}
}
/**
* Breaks tangent handle movement when ‘Alt’ key is held down. Adds the current handle index and
* its matching (opposite) handle to a list of broken handle indices.
* @param handleNum The index of the currently selected handle point.
*/
@action
onBreakTangent = (e: KeyboardEvent, controlIndex: number) => {
const doc: Doc = this.props.inkDoc;
if (["Alt"].includes(e.key)) {
if (doc) {
const brokenIndices = Cast(doc.brokenInkIndices, listSpec("number")) || new List;
if (brokenIndices && !brokenIndices.includes(controlIndex)) {
brokenIndices.push(controlIndex);
}
doc.brokenInkIndices = brokenIndices;
}
}
}
render() {
const formatInstance = InkStrokeProperties.Instance;
if (!formatInstance) return (null);
// Accessing the current ink's data and extracting all handle points and handle lines.
const data = this.props.data;
const handlePoints: HandlePoint[] = [];
const handleLines: HandleLine[] = [];
if (data.length >= 4) {
for (let i = 0; i <= data.length - 4; i += 4) {
handlePoints.push({ X: data[i + 1].X, Y: data[i + 1].Y, I: i + 1, dot1: i, dot2: i === 0 ? i : i - 1 });
handlePoints.push({ X: data[i + 2].X, Y: data[i + 2].Y, I: i + 2, dot1: i + 3, dot2: i === data.length ? i + 3 : i + 4 });
}
// Adding first and last (single) handle lines.
handleLines.push({ X1: data[0].X, Y1: data[0].Y, X2: data[0].X, Y2: data[0].Y, X3: data[1].X, Y3: data[1].Y, dot1: 0, dot2: 0 });
handleLines.push({ X1: data[data.length - 2].X, Y1: data[data.length - 2].Y, X2: data[data.length - 1].X, Y2: data[data.length - 1].Y, X3: data[data.length - 1].X, Y3: data[data.length - 1].Y, dot1: data.length - 1, dot2: data.length - 1 });
for (let i = 2; i < data.length - 4; i += 4) {
handleLines.push({ X1: data[i].X, Y1: data[i].Y, X2: data[i + 1].X, Y2: data[i + 1].Y, X3: data[i + 3].X, Y3: data[i + 3].Y, dot1: i + 1, dot2: i + 2 });
}
}
const [left, top, scaleX, scaleY, strokeWidth, dotsize] = this.props.format;
return (
<>
{handlePoints.map((pts, i) =>
<svg height="10" width="10" key={`hdl${i}`}>
<circle
cx={(pts.X - left - strokeWidth / 2) * scaleX + strokeWidth / 2}
cy={(pts.Y - top - strokeWidth / 2) * scaleY + strokeWidth / 2}
r={strokeWidth / 2}
strokeWidth={0}
fill="#1F85DE"
onPointerDown={(e) => this.onHandleDown(e, pts.I)}
pointerEvents="all"
cursor="default"
display={(pts.dot1 === formatInstance._currentPoint || pts.dot2 === formatInstance._currentPoint) ? "inherit" : "none"} />
</svg>)}
{handleLines.map((pts, i) =>
<svg height="100" width="100" key={`line${i}`}>
<line
x1={(pts.X1 - left - strokeWidth / 2) * scaleX + strokeWidth / 2}
y1={(pts.Y1 - top - strokeWidth / 2) * scaleY + strokeWidth / 2}
x2={(pts.X2 - left - strokeWidth / 2) * scaleX + strokeWidth / 2}
y2={(pts.Y2 - top - strokeWidth / 2) * scaleY + strokeWidth / 2}
stroke="#1F85DE"
strokeWidth={dotsize / 8}
display={(pts.dot1 === formatInstance._currentPoint || pts.dot2 === formatInstance._currentPoint) ? "inherit" : "none"} />
<line
x1={(pts.X2 - left - strokeWidth / 2) * scaleX + strokeWidth / 2}
y1={(pts.Y2 - top - strokeWidth / 2) * scaleY + strokeWidth / 2}
x2={(pts.X3 - left - strokeWidth / 2) * scaleX + strokeWidth / 2}
y2={(pts.Y3 - top - strokeWidth / 2) * scaleY + strokeWidth / 2}
stroke="#1F85DE"
strokeWidth={dotsize / 8}
display={(pts.dot1 === formatInstance._currentPoint || pts.dot2 === formatInstance._currentPoint) ? "inherit" : "none"} />
</svg>)}
</>
);
}
}
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