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import React, { useEffect, useRef } from "react";
import type { RoughCanvas } from "roughjs/bin/canvas";
import { renderStaticScene } from "../../renderer/staticScene";
import { isShallowEqual } from "../../utils";
import type { AppState, StaticCanvasAppState } from "../../types";
import type {
RenderableElementsMap,
StaticCanvasRenderConfig,
} from "../../scene/types";
import type {
NonDeletedExcalidrawElement,
NonDeletedSceneElementsMap,
} from "../../element/types";
import { isRenderThrottlingEnabled } from "../../reactUtils";
type StaticCanvasProps = {
canvas: HTMLCanvasElement;
rc: RoughCanvas;
elementsMap: RenderableElementsMap;
allElementsMap: NonDeletedSceneElementsMap;
visibleElements: readonly NonDeletedExcalidrawElement[];
sceneNonce: number | undefined;
selectionNonce: number | undefined;
scale: number;
appState: StaticCanvasAppState;
renderConfig: StaticCanvasRenderConfig;
};
const StaticCanvas = (props: StaticCanvasProps) => {
const wrapperRef = useRef<HTMLDivElement>(null);
const isComponentMounted = useRef(false);
useEffect(() => {
const wrapper = wrapperRef.current;
if (!wrapper) {
return;
}
const canvas = props.canvas;
if (!isComponentMounted.current) {
isComponentMounted.current = true;
wrapper.replaceChildren(canvas);
canvas.classList.add("excalidraw__canvas", "static");
}
const widthString = `${props.appState.width}px`;
const heightString = `${props.appState.height}px`;
if (canvas.style.width !== widthString) {
canvas.style.width = widthString;
}
if (canvas.style.height !== heightString) {
canvas.style.height = heightString;
}
const scaledWidth = props.appState.width * props.scale;
const scaledHeight = props.appState.height * props.scale;
// setting width/height resets the canvas even if dimensions not changed,
// which would cause flicker when we skip frame (due to throttling)
if (canvas.width !== scaledWidth) {
canvas.width = scaledWidth;
}
if (canvas.height !== scaledHeight) {
canvas.height = scaledHeight;
}
renderStaticScene(
{
canvas,
rc: props.rc,
scale: props.scale,
elementsMap: props.elementsMap,
allElementsMap: props.allElementsMap,
visibleElements: props.visibleElements,
appState: props.appState,
renderConfig: props.renderConfig,
},
isRenderThrottlingEnabled(),
);
});
return <div className="excalidraw__canvas-wrapper" ref={wrapperRef} />;
};
const getRelevantAppStateProps = (
appState: AppState,
): StaticCanvasAppState => ({
zoom: appState.zoom,
scrollX: appState.scrollX,
scrollY: appState.scrollY,
width: appState.width,
height: appState.height,
viewModeEnabled: appState.viewModeEnabled,
openDialog: appState.openDialog,
hoveredElementIds: appState.hoveredElementIds,
offsetLeft: appState.offsetLeft,
offsetTop: appState.offsetTop,
theme: appState.theme,
pendingImageElementId: appState.pendingImageElementId,
shouldCacheIgnoreZoom: appState.shouldCacheIgnoreZoom,
viewBackgroundColor: appState.viewBackgroundColor,
exportScale: appState.exportScale,
selectedElementsAreBeingDragged: appState.selectedElementsAreBeingDragged,
gridSize: appState.gridSize,
gridStep: appState.gridStep,
frameRendering: appState.frameRendering,
selectedElementIds: appState.selectedElementIds,
frameToHighlight: appState.frameToHighlight,
editingGroupId: appState.editingGroupId,
currentHoveredFontFamily: appState.currentHoveredFontFamily,
croppingElementId: appState.croppingElementId,
});
const areEqual = (
prevProps: StaticCanvasProps,
nextProps: StaticCanvasProps,
) => {
if (
prevProps.sceneNonce !== nextProps.sceneNonce ||
prevProps.scale !== nextProps.scale ||
// we need to memoize on elementsMap because they may have renewed
// even if sceneNonce didn't change (e.g. we filter elements out based
// on appState)
prevProps.elementsMap !== nextProps.elementsMap ||
prevProps.visibleElements !== nextProps.visibleElements
) {
return false;
}
return (
isShallowEqual(
// asserting AppState because we're being passed the whole AppState
// but resolve to only the StaticCanvas-relevant props
getRelevantAppStateProps(prevProps.appState as AppState),
getRelevantAppStateProps(nextProps.appState as AppState),
) && isShallowEqual(prevProps.renderConfig, nextProps.renderConfig)
);
};
export default React.memo(StaticCanvas, areEqual);
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