From 2624ad307a0b78c67b0bab9fa8f734372fdd12c2 Mon Sep 17 00:00:00 2001
From: xwatson <xwatson@foxmail.com>
Date: Thu, 4 Dec 2025 15:44:38 +0800
Subject: [PATCH 1/2] chore: optimize virtual logs

---
 .../components/editable/editable.component.ts | 26 +++++++++----------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/packages/src/components/editable/editable.component.ts b/packages/src/components/editable/editable.component.ts
index 037eb1d..bfc0eb9 100644
--- a/packages/src/components/editable/editable.component.ts
+++ b/packages/src/components/editable/editable.component.ts
@@ -670,10 +670,12 @@ export class SlateEditable implements OnInit, OnChanges, OnDestroy, AfterViewChe
             if (localStorage.getItem(SLATE_DEBUG_KEY) === 'true') {
                 const diffTopRenderedIndexes = [];
                 const diffBottomRenderedIndexes = [];
-                let direction = '';
-                if (newVisibleIndexes[0] > oldVisibleIndexes[0]) {
+                const isMissingTop = newVisibleIndexes[0] > oldVisibleIndexes[0];
+                const isAddedTop = newVisibleIndexes[0] < oldVisibleIndexes[0];
+                const isMissingBottom = newVisibleIndexes[newVisibleIndexes.length - 1] > oldVisibleIndexes[oldVisibleIndexes.length - 1];
+                const isAddedBottom = newVisibleIndexes[newVisibleIndexes.length - 1] < oldVisibleIndexes[oldVisibleIndexes.length - 1];
+                if (isMissingTop || isMissingBottom) {
                     // 向下
-                    direction = 'down';
                     for (let index = 0; index < oldVisibleIndexes.length; index++) {
                         const element = oldVisibleIndexes[index];
                         if (!newVisibleIndexes.includes(element)) {
@@ -690,9 +692,8 @@ export class SlateEditable implements OnInit, OnChanges, OnDestroy, AfterViewChe
                             break;
                         }
                     }
-                } else {
+                } else if (isAddedTop || isAddedBottom) {
                     // 向上
-                    direction = 'up';
                     for (let index = 0; index < newVisibleIndexes.length; index++) {
                         const element = newVisibleIndexes[index];
                         if (!oldVisibleIndexes.includes(element)) {
@@ -712,18 +713,17 @@ export class SlateEditable implements OnInit, OnChanges, OnDestroy, AfterViewChe
                 }
                 console.log('oldVisibleIndexes:', oldVisibleIndexes);
                 console.log('newVisibleIndexes:', newVisibleIndexes);
-                const directionStr = direction === 'down' ? '+' : '-';
                 console.log(
                     'diffTopRenderedIndexes:',
-                    directionStr,
+                    isMissingTop ? '-' : isAddedTop ? '+' : '-',
                     diffTopRenderedIndexes,
-                    diffTopRenderedIndexes.map(index => virtualView.heights[index])
+                    diffTopRenderedIndexes.map(index => this.getBlockHeight(index, 0))
                 );
                 console.log(
                     'diffBottomRenderedIndexes:',
-                    directionStr,
+                    isMissingBottom ? '+' : isAddedBottom ? '-' : '+',
                     diffBottomRenderedIndexes,
-                    diffBottomRenderedIndexes.map(index => virtualView.heights[index])
+                    diffBottomRenderedIndexes.map(index => this.getBlockHeight(index, 0))
                 );
                 const needTop = virtualView.heights.slice(0, newVisibleIndexes[0]).reduce((acc, height) => acc + height, 0);
                 const needBottom = virtualView.heights
@@ -738,13 +738,13 @@ export class SlateEditable implements OnInit, OnChanges, OnDestroy, AfterViewChe
         return false;
     }
 
-    private getBlockHeight(index: number) {
+    private getBlockHeight(index: number, defaultHeight: number = VIRTUAL_SCROLL_DEFAULT_BLOCK_HEIGHT) {
         const node = this.editor.children[index];
         if (!node) {
-            return VIRTUAL_SCROLL_DEFAULT_BLOCK_HEIGHT;
+            return defaultHeight;
         }
         const key = AngularEditor.findKey(this.editor, node);
-        return this.measuredHeights.get(key.id) ?? VIRTUAL_SCROLL_DEFAULT_BLOCK_HEIGHT;
+        return this.measuredHeights.get(key.id) ?? defaultHeight;
     }
 
     private buildAccumulatedHeight(heights: number[]) {

From df8d961de025d9c7cf6868d5a0c214b5a6f5c426 Mon Sep 17 00:00:00 2001
From: xwatson <xwatson@foxmail.com>
Date: Thu, 4 Dec 2025 15:45:09 +0800
Subject: [PATCH 2/2] feat: add note

---
 .changeset/bright-buses-wish.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/bright-buses-wish.md

diff --git a/.changeset/bright-buses-wish.md b/.changeset/bright-buses-wish.md
new file mode 100644
index 0000000..ad64a37
--- /dev/null
+++ b/.changeset/bright-buses-wish.md
@@ -0,0 +1,5 @@
+---
+'slate-angular': patch
+---
+
+optimize virtual logs