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import type { ExcalidrawElement, NonDeletedSceneElementsMap } from "./types";
import Scene from "../scene/Scene";
import { getSizeFromPoints } from "../points";
import { randomInteger } from "../random";
import { getUpdatedTimestamp, toBrandedType } from "../utils";
import type { Mutable } from "../utility-types";
import { ShapeCache } from "../scene/ShapeCache";
import { isElbowArrow } from "./typeChecks";
import { updateElbowArrowPoints } from "./elbowArrow";
import type { Radians } from "@excalidraw/math";
export type ElementUpdate<TElement extends ExcalidrawElement> = Omit<
Partial<TElement>,
"id" | "version" | "versionNonce" | "updated"
>;
// This function tracks updates of text elements for the purposes for collaboration.
// The version is used to compare updates when more than one user is working in
// the same drawing. Note: this will trigger the component to update. Make sure you
// are calling it either from a React event handler or within unstable_batchedUpdates().
export const mutateElement = <TElement extends Mutable<ExcalidrawElement>>(
element: TElement,
updates: ElementUpdate<TElement>,
informMutation = true,
options?: {
// Currently only for elbow arrows.
// If true, the elbow arrow tries to bind to the nearest element. If false
// it tries to keep the same bound element, if any.
isDragging?: boolean;
},
): TElement => {
let didChange = false;
// casting to any because can't use `in` operator
// (see https://github.com/microsoft/TypeScript/issues/21732)
const { points, fixedSegments, fileId, startBinding, endBinding } =
updates as any;
if (
isElbowArrow(element) &&
(Object.keys(updates).length === 0 || // normalization case
typeof points !== "undefined" || // repositioning
typeof fixedSegments !== "undefined" || // segment fixing
typeof startBinding !== "undefined" ||
typeof endBinding !== "undefined") // manual binding to element
) {
const elementsMap = toBrandedType<NonDeletedSceneElementsMap>(
Scene.getScene(element)?.getNonDeletedElementsMap() ?? new Map(),
);
updates = {
...updates,
angle: 0 as Radians,
...updateElbowArrowPoints(
{
...element,
x: updates.x || element.x,
y: updates.y || element.y,
},
elementsMap,
{
fixedSegments,
points,
startBinding,
endBinding,
},
{
isDragging: options?.isDragging,
},
),
};
} else if (typeof points !== "undefined") {
updates = { ...getSizeFromPoints(points), ...updates };
}
for (const key in updates) {
const value = (updates as any)[key];
if (typeof value !== "undefined") {
if (
(element as any)[key] === value &&
// if object, always update because its attrs could have changed
// (except for specific keys we handle below)
(typeof value !== "object" ||
value === null ||
key === "groupIds" ||
key === "scale")
) {
continue;
}
if (key === "scale") {
const prevScale = (element as any)[key];
const nextScale = value;
if (prevScale[0] === nextScale[0] && prevScale[1] === nextScale[1]) {
continue;
}
} else if (key === "points") {
const prevPoints = (element as any)[key];
const nextPoints = value;
if (prevPoints.length === nextPoints.length) {
let didChangePoints = false;
let index = prevPoints.length;
while (--index) {
const prevPoint = prevPoints[index];
const nextPoint = nextPoints[index];
if (
prevPoint[0] !== nextPoint[0] ||
prevPoint[1] !== nextPoint[1]
) {
didChangePoints = true;
break;
}
}
if (!didChangePoints) {
continue;
}
}
}
(element as any)[key] = value;
didChange = true;
}
}
if (!didChange) {
return element;
}
if (
typeof updates.height !== "undefined" ||
typeof updates.width !== "undefined" ||
typeof fileId != "undefined" ||
typeof points !== "undefined"
) {
ShapeCache.delete(element);
}
element.version++;
element.versionNonce = randomInteger();
element.updated = getUpdatedTimestamp();
if (informMutation) {
Scene.getScene(element)?.triggerUpdate();
}
return element;
};
export const newElementWith = <TElement extends ExcalidrawElement>(
element: TElement,
updates: ElementUpdate<TElement>,
/** pass `true` to always regenerate */
force = false,
): TElement => {
let didChange = false;
for (const key in updates) {
const value = (updates as any)[key];
if (typeof value !== "undefined") {
if (
(element as any)[key] === value &&
// if object, always update because its attrs could have changed
(typeof value !== "object" || value === null)
) {
continue;
}
didChange = true;
}
}
if (!didChange && !force) {
return element;
}
return {
...element,
...updates,
updated: getUpdatedTimestamp(),
version: element.version + 1,
versionNonce: randomInteger(),
};
};
/**
* Mutates element, bumping `version`, `versionNonce`, and `updated`.
*
* NOTE: does not trigger re-render.
*/
export const bumpVersion = <T extends Mutable<ExcalidrawElement>>(
element: T,
version?: ExcalidrawElement["version"],
) => {
element.version = (version ?? element.version) + 1;
element.versionNonce = randomInteger();
element.updated = getUpdatedTimestamp();
return element;
};
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