refactor(editor): move mindmap transform to its package (#11115)

blocksuite/affine/gfx/mindmap/src/utils/index.ts

@@ -0,0 +1,70 @@
+import { MindmapElementModel } from '@blocksuite/affine-model';
+import type {
+  GfxBlockElementModel,
+  GfxModel,
+  Viewport,
+} from '@blocksuite/block-std/gfx';
+
+export function isMindmapNode(element: GfxBlockElementModel | GfxModel | null) {
+  return element?.group instanceof MindmapElementModel;
+}
+
+export function isSingleMindMapNode(els: GfxModel[]) {
+  return els.length === 1 && els[0].group instanceof MindmapElementModel;
+}
+
+export function isElementOutsideViewport(
+  viewport: Viewport,
+  element: GfxModel,
+  padding: [number, number] = [0, 0]
+) {
+  const elementBound = element.elementBound;
+
+  padding[0] /= viewport.zoom;
+  padding[1] /= viewport.zoom;
+
+  elementBound.x -= padding[1];
+  elementBound.w += padding[1];
+  elementBound.y -= padding[0];
+  elementBound.h += padding[0];
+
+  return !viewport.viewportBounds.contains(elementBound);
+}
+
+export function getNearestTranslation(
+  viewport: Viewport,
+  element: GfxModel,
+  padding: [number, number] = [0, 0]
+) {
+  const viewportBound = viewport.viewportBounds;
+  const elementBound = element.elementBound;
+  let dx = 0;
+  let dy = 0;
+
+  if (elementBound.x - padding[1] < viewportBound.x) {
+    dx = viewportBound.x - (elementBound.x - padding[1]);
+  } else if (
+    elementBound.x + elementBound.w + padding[1] >
+    viewportBound.x + viewportBound.w
+  ) {
+    dx =
+      viewportBound.x +
+      viewportBound.w -
+      (elementBound.x + elementBound.w + padding[1]);
+  }
+
+  if (elementBound.y - padding[0] < viewportBound.y) {
+    dy = elementBound.y - padding[0] - viewportBound.y;
+  } else if (
+    elementBound.y + elementBound.h + padding[0] >
+    viewportBound.y + viewportBound.h
+  ) {
+    dy =
+      elementBound.y +
+      elementBound.h +
+      padding[0] -
+      (viewportBound.y + viewportBound.h);
+  }
+
+  return [dx, dy];
+}