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InteractiveCanvas.tsx
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InteractiveCanvas.tsx
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import React, { useEffect, useRef } from "react";
import { renderInteractiveScene } from "../../renderer/renderScene";
import {
isRenderThrottlingEnabled,
isShallowEqual,
sceneCoordsToViewportCoords,
} from "../../utils";
import { CURSOR_TYPE } from "../../constants";
import { t } from "../../i18n";
import type { DOMAttributes } from "react";
import type { AppState, InteractiveCanvasAppState } from "../../types";
import type {
InteractiveCanvasRenderConfig,
RenderInteractiveSceneCallback,
} from "../../scene/types";
import type { NonDeletedExcalidrawElement } from "../../element/types";
type InteractiveCanvasProps = {
containerRef: React.RefObject<HTMLDivElement>;
canvas: HTMLCanvasElement | null;
elements: readonly NonDeletedExcalidrawElement[];
visibleElements: readonly NonDeletedExcalidrawElement[];
selectedElements: readonly NonDeletedExcalidrawElement[];
versionNonce: number | undefined;
selectionNonce: number | undefined;
scale: number;
appState: InteractiveCanvasAppState;
renderInteractiveSceneCallback: (
data: RenderInteractiveSceneCallback,
) => void;
handleCanvasRef: (canvas: HTMLCanvasElement | null) => void;
onContextMenu: Exclude<
DOMAttributes<HTMLCanvasElement | HTMLDivElement>["onContextMenu"],
undefined
>;
onPointerMove: Exclude<
DOMAttributes<HTMLCanvasElement>["onPointerMove"],
undefined
>;
onPointerUp: Exclude<
DOMAttributes<HTMLCanvasElement>["onPointerUp"],
undefined
>;
onPointerCancel: Exclude<
DOMAttributes<HTMLCanvasElement>["onPointerCancel"],
undefined
>;
onTouchMove: Exclude<
DOMAttributes<HTMLCanvasElement>["onTouchMove"],
undefined
>;
onPointerDown: Exclude<
DOMAttributes<HTMLCanvasElement>["onPointerDown"],
undefined
>;
onDoubleClick: Exclude<
DOMAttributes<HTMLCanvasElement>["onDoubleClick"],
undefined
>;
};
const InteractiveCanvas = (props: InteractiveCanvasProps) => {
const isComponentMounted = useRef(false);
useEffect(() => {
if (!isComponentMounted.current) {
isComponentMounted.current = true;
return;
}
const cursorButton: {
[id: string]: string | undefined;
} = {};
const pointerViewportCoords: InteractiveCanvasRenderConfig["remotePointerViewportCoords"] =
{};
const remoteSelectedElementIds: InteractiveCanvasRenderConfig["remoteSelectedElementIds"] =
{};
const pointerUsernames: { [id: string]: string } = {};
const pointerUserStates: { [id: string]: string } = {};
props.appState.collaborators.forEach((user, socketId) => {
if (user.selectedElementIds) {
for (const id of Object.keys(user.selectedElementIds)) {
if (!(id in remoteSelectedElementIds)) {
remoteSelectedElementIds[id] = [];
}
remoteSelectedElementIds[id].push(socketId);
}
}
if (!user.pointer) {
return;
}
if (user.username) {
pointerUsernames[socketId] = user.username;
}
if (user.userState) {
pointerUserStates[socketId] = user.userState;
}
pointerViewportCoords[socketId] = sceneCoordsToViewportCoords(
{
sceneX: user.pointer.x,
sceneY: user.pointer.y,
},
props.appState,
);
cursorButton[socketId] = user.button;
});
const selectionColor =
(props.containerRef?.current &&
getComputedStyle(props.containerRef.current).getPropertyValue(
"--color-selection",
)) ||
"#6965db";
renderInteractiveScene(
{
canvas: props.canvas,
elements: props.elements,
visibleElements: props.visibleElements,
selectedElements: props.selectedElements,
scale: window.devicePixelRatio,
appState: props.appState,
renderConfig: {
remotePointerViewportCoords: pointerViewportCoords,
remotePointerButton: cursorButton,
remoteSelectedElementIds,
remotePointerUsernames: pointerUsernames,
remotePointerUserStates: pointerUserStates,
selectionColor,
renderScrollbars: false,
},
callback: props.renderInteractiveSceneCallback,
},
isRenderThrottlingEnabled(),
);
});
return (
<canvas
className="excalidraw__canvas interactive"
style={{
width: props.appState.width,
height: props.appState.height,
cursor: props.appState.viewModeEnabled
? CURSOR_TYPE.GRAB
: CURSOR_TYPE.AUTO,
}}
width={props.appState.width * props.scale}
height={props.appState.height * props.scale}
ref={props.handleCanvasRef}
onContextMenu={props.onContextMenu}
onPointerMove={props.onPointerMove}
onPointerUp={props.onPointerUp}
onPointerCancel={props.onPointerCancel}
onTouchMove={props.onTouchMove}
onPointerDown={props.onPointerDown}
onDoubleClick={
props.appState.viewModeEnabled ? undefined : props.onDoubleClick
}
>
{t("labels.drawingCanvas")}
</canvas>
);
};
const getRelevantAppStateProps = (
appState: AppState,
): InteractiveCanvasAppState => ({
zoom: appState.zoom,
scrollX: appState.scrollX,
scrollY: appState.scrollY,
width: appState.width,
height: appState.height,
viewModeEnabled: appState.viewModeEnabled,
editingGroupId: appState.editingGroupId,
editingLinearElement: appState.editingLinearElement,
selectedElementIds: appState.selectedElementIds,
frameToHighlight: appState.frameToHighlight,
offsetLeft: appState.offsetLeft,
offsetTop: appState.offsetTop,
theme: appState.theme,
pendingImageElementId: appState.pendingImageElementId,
selectionElement: appState.selectionElement,
selectedGroupIds: appState.selectedGroupIds,
selectedLinearElement: appState.selectedLinearElement,
multiElement: appState.multiElement,
isBindingEnabled: appState.isBindingEnabled,
suggestedBindings: appState.suggestedBindings,
isRotating: appState.isRotating,
elementsToHighlight: appState.elementsToHighlight,
openSidebar: appState.openSidebar,
showHyperlinkPopup: appState.showHyperlinkPopup,
collaborators: appState.collaborators, // Necessary for collab. sessions
activeEmbeddable: appState.activeEmbeddable,
snapLines: appState.snapLines,
zenModeEnabled: appState.zenModeEnabled,
});
const areEqual = (
prevProps: InteractiveCanvasProps,
nextProps: InteractiveCanvasProps,
) => {
// This could be further optimised if needed, as we don't have to render interactive canvas on each scene mutation
if (
prevProps.selectionNonce !== nextProps.selectionNonce ||
prevProps.versionNonce !== nextProps.versionNonce ||
prevProps.scale !== nextProps.scale ||
// we need to memoize on element arrays because they may have renewed
// even if versionNonce didn't change (e.g. we filter elements out based
// on appState)
prevProps.elements !== nextProps.elements ||
prevProps.visibleElements !== nextProps.visibleElements ||
prevProps.selectedElements !== nextProps.selectedElements
) {
return false;
}
// Comparing the interactive appState for changes in case of some edge cases
return isShallowEqual(
// asserting AppState because we're being passed the whole AppState
// but resolve to only the InteractiveCanvas-relevant props
getRelevantAppStateProps(prevProps.appState as AppState),
getRelevantAppStateProps(nextProps.appState as AppState),
);
};
export default React.memo(InteractiveCanvas, areEqual);