feat(editor): table block supports drag-and-drop sorting (#10065)

close: BS-2477

blocksuite/affine/shared/src/utils/drag-helper/linear-move.ts

@@ -0,0 +1,38 @@
+import type { OffsetList } from './types';
+export const getTargetIndexByDraggingOffset = (
+  offsets: OffsetList,
+  draggingIndex: number,
+  indicatorLeft: number
+) => {
+  const originalStart = offsets[draggingIndex];
+  const originalWidth = offsets[draggingIndex + 1] - originalStart;
+  const indicatorRight = indicatorLeft + originalWidth;
+  const isForward = indicatorLeft > originalStart;
+  const startIndex = isForward ? draggingIndex + 1 : 0;
+  const endIndex = isForward ? offsets.length - 1 : draggingIndex - 1;
+  if (isForward) {
+    for (let i = endIndex; i >= startIndex; i--) {
+      const blockCenter = (offsets[i] + offsets[i + 1]) / 2;
+      if (indicatorRight > blockCenter) {
+        return {
+          targetIndex: i,
+          isForward,
+        };
+      }
+    }
+  } else {
+    for (let i = startIndex; i <= endIndex; i++) {
+      const blockCenter = (offsets[i] + offsets[i + 1]) / 2;
+      if (indicatorLeft < blockCenter) {
+        return {
+          targetIndex: i,
+          isForward,
+        };
+      }
+    }
+  }
+  return {
+    targetIndex: undefined,
+    isForward,
+  };
+};