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import { isElementInViewport } from "../element/sizeHelpers";
import { isImageElement } from "../element/typeChecks";
import type {
ExcalidrawElement,
NonDeletedElementsMap,
NonDeletedExcalidrawElement,
} from "../element/types";
import { renderInteractiveSceneThrottled } from "../renderer/interactiveScene";
import { renderStaticSceneThrottled } from "../renderer/staticScene";
import type { AppState } from "../types";
import { memoize, toBrandedType } from "../utils";
import type Scene from "./Scene";
import type { RenderableElementsMap } from "./types";
export class Renderer {
private scene: Scene;
constructor(scene: Scene) {
this.scene = scene;
}
public getRenderableElements = (() => {
const getVisibleCanvasElements = ({
elementsMap,
zoom,
offsetLeft,
offsetTop,
scrollX,
scrollY,
height,
width,
}: {
elementsMap: NonDeletedElementsMap;
zoom: AppState["zoom"];
offsetLeft: AppState["offsetLeft"];
offsetTop: AppState["offsetTop"];
scrollX: AppState["scrollX"];
scrollY: AppState["scrollY"];
height: AppState["height"];
width: AppState["width"];
}): readonly NonDeletedExcalidrawElement[] => {
const visibleElements: NonDeletedExcalidrawElement[] = [];
for (const element of elementsMap.values()) {
if (
isElementInViewport(
element,
width,
height,
{
zoom,
offsetLeft,
offsetTop,
scrollX,
scrollY,
},
elementsMap,
)
) {
visibleElements.push(element);
}
}
return visibleElements;
};
const getRenderableElements = ({
elements,
editingTextElement,
newElementId,
pendingImageElementId,
}: {
elements: readonly NonDeletedExcalidrawElement[];
editingTextElement: AppState["editingTextElement"];
newElementId: ExcalidrawElement["id"] | undefined;
pendingImageElementId: AppState["pendingImageElementId"];
}) => {
const elementsMap = toBrandedType<RenderableElementsMap>(new Map());
for (const element of elements) {
if (isImageElement(element)) {
if (
// => not placed on canvas yet (but in elements array)
pendingImageElementId === element.id
) {
continue;
}
}
if (newElementId === element.id) {
continue;
}
// we don't want to render text element that's being currently edited
// (it's rendered on remote only)
if (
!editingTextElement ||
editingTextElement.type !== "text" ||
element.id !== editingTextElement.id
) {
elementsMap.set(element.id, element);
}
}
return elementsMap;
};
return memoize(
({
zoom,
offsetLeft,
offsetTop,
scrollX,
scrollY,
height,
width,
editingTextElement,
newElementId,
pendingImageElementId,
// cache-invalidation nonce
sceneNonce: _sceneNonce,
}: {
zoom: AppState["zoom"];
offsetLeft: AppState["offsetLeft"];
offsetTop: AppState["offsetTop"];
scrollX: AppState["scrollX"];
scrollY: AppState["scrollY"];
height: AppState["height"];
width: AppState["width"];
editingTextElement: AppState["editingTextElement"];
/** note: first render of newElement will always bust the cache
* (we'd have to prefilter elements outside of this function) */
newElementId: ExcalidrawElement["id"] | undefined;
pendingImageElementId: AppState["pendingImageElementId"];
sceneNonce: ReturnType<InstanceType<typeof Scene>["getSceneNonce"]>;
}) => {
const elements = this.scene.getNonDeletedElements();
const elementsMap = getRenderableElements({
elements,
editingTextElement,
newElementId,
pendingImageElementId,
});
const visibleElements = getVisibleCanvasElements({
elementsMap,
zoom,
offsetLeft,
offsetTop,
scrollX,
scrollY,
height,
width,
});
return { elementsMap, visibleElements };
},
);
})();
// NOTE Doesn't destroy everything (scene, rc, etc.) because it may not be
// safe to break TS contract here (for upstream cases)
public destroy() {
renderInteractiveSceneThrottled.cancel();
renderStaticSceneThrottled.cancel();
this.getRenderableElements.clear();
}
}
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