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scroll the closest element to center (#1670)

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Co-authored-by: Sanghyeon Lee <yongdamsh@gmail.com>
This commit is contained in:
Aakansha Doshi 2020-05-30 17:32:32 +05:30 • committed by GitHub
parent 0db7ac78c4
commit fa359034c5
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10 changed files with 100 additions and 15 deletions
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50
src/scene/scroll.ts
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@ -1,12 +1,43 @@
import { FlooredNumber } from "../types";
import { AppState, FlooredNumber } from "../types";
import { ExcalidrawElement } from "../element/types";
import { getCommonBounds } from "../element";
import { getCommonBounds, getClosestElementBounds } from "../element";
import {
sceneCoordsToViewportCoords,
viewportCoordsToSceneCoords,
} from "../utils";
export const normalizeScroll = (pos: number) =>
Math.floor(pos) as FlooredNumber;
function isOutsideViewPort(
appState: AppState,
canvas: HTMLCanvasElement | null,
cords: Array<number>,
) {
const [x1, y1, x2, y2] = cords;
const { x: viewportX1, y: viewportY1 } = sceneCoordsToViewportCoords(
{ sceneX: x1, sceneY: y1 },
appState,
canvas,
window.devicePixelRatio,
);
const { x: viewportX2, y: viewportY2 } = sceneCoordsToViewportCoords(
{ sceneX: x2, sceneY: y2 },
appState,
canvas,
window.devicePixelRatio,
);
return (
viewportX2 - viewportX1 > window.innerWidth ||
viewportY2 - viewportY1 > window.innerHeight
);
}
export const calculateScrollCenter = (
elements: readonly ExcalidrawElement[],
appState: AppState,
canvas: HTMLCanvasElement | null,
): { scrollX: FlooredNumber; scrollY: FlooredNumber } => {
if (!elements.length) {
return {
@ -14,8 +45,19 @@ export const calculateScrollCenter = (
scrollY: normalizeScroll(0),
};
}
const [x1, y1, x2, y2] = getCommonBounds(elements);
const scale = window.devicePixelRatio;
let [x1, y1, x2, y2] = getCommonBounds(elements);
if (isOutsideViewPort(appState, canvas, [x1, y1, x2, y2])) {
[x1, y1, x2, y2] = getClosestElementBounds(
elements,
viewportCoordsToSceneCoords(
{ clientX: appState.scrollX, clientY: appState.scrollY },
appState,
canvas,
scale,
),
);
}
const centerX = (x1 + x2) / 2;
const centerY = (y1 + y2) / 2;