refactor(editor): extract root block (#10356)

Closes: [BS-2207](https://linear.app/affine-design/issue/BS-2207/move-root-block-to-affineblock-root)
2026-08-21 20:11:43 +08:00 · 2025-02-21 12:38:26 +00:00
parent 4a66ec7400
commit 55651503df
336 changed files with 626 additions and 423 deletions
@@ -0,0 +1,46 @@
+import type { PointerEventState } from '@blocksuite/block-std';
+import type { Viewport } from '@blocksuite/block-std/gfx';
+import type { IVec } from '@blocksuite/global/utils';
+
+const PANNING_DISTANCE = 30;
+
+export function calPanDelta(
+  viewport: Viewport,
+  e: PointerEventState,
+  edgeDistance = 20
+): IVec | null {
+  // Get viewport edge
+  const { left, top } = viewport;
+  const { width, height } = viewport;
+  // Get pointer position
+  let { x, y } = e;
+  const { containerOffset } = e;
+  x += containerOffset.x;
+  y += containerOffset.y;
+  // Check if pointer is near viewport edge
+  const nearLeft = x < left + edgeDistance;
+  const nearRight = x > left + width - edgeDistance;
+  const nearTop = y < top + edgeDistance;
+  const nearBottom = y > top + height - edgeDistance;
+  // If pointer is not near viewport edge, return false
+  if (!(nearLeft || nearRight || nearTop || nearBottom)) return null;
+
+  // Calculate move delta
+  let deltaX = 0;
+  let deltaY = 0;
+
+  // Use PANNING_DISTANCE to limit the max delta, avoid panning too fast
+  if (nearLeft) {
+    deltaX = Math.max(-PANNING_DISTANCE, x - (left + edgeDistance));
+  } else if (nearRight) {
+    deltaX = Math.min(PANNING_DISTANCE, x - (left + width - edgeDistance));
+  }
+
+  if (nearTop) {
+    deltaY = Math.max(-PANNING_DISTANCE, y - (top + edgeDistance));
+  } else if (nearBottom) {
+    deltaY = Math.min(PANNING_DISTANCE, y - (top + height - edgeDistance));
+  }
+
+  return [deltaX, deltaY];
+}