Function inferViewportRect

src/core/scroll-gesture.ts:228–245

(nodes: Array<Pick<SnapshotNode, 'type' | 'rect'>>)

}

function inferViewportRect(nodes: Array<Pick<SnapshotNode, 'type' | 'rect'>>): Rect | undefined {
  const candidate = nodes
    .filter((node) => isViewportNode(node.type) && isValidRect(node.rect))
    .map((node) => node.rect)
    .sort(
      (left, right) =>
        (right?.width ?? 0) * (right?.height ?? 0) - (left?.width ?? 0) * (left?.height ?? 0),
    )[0];
  if (candidate) return candidate;

  const rects = nodes.map((node) => node.rect).filter(isValidRect);
  if (rects.length === 0) return undefined;

  const width = Math.max(...rects.map((rect) => rect.x + rect.width));
  const height = Math.max(...rects.map((rect) => rect.y + rect.height));
  if (width <= 0 || height <= 0) return undefined;
  return { x: 0, y: 0, width, height };
}

function isViewportNode(type: string | undefined): boolean {
  if (!type) return false;