@infinite-list/data-model - npm Package Compare versions

Comparing version 0.1.1-recycle-alpha.2 to 0.1.1-recycle-alpha.3

dist/struct/IntegerBufferSet.d.ts

@@ -13,2 +13,3 @@ import Heap from './Heap';
     getSize(): number;
+    get indices(): any[];
     getValuePosition(value: number): null | number;
@@ -15,0 +16,0 @@ getNewPositionForValue(value: number): number;

package.json

 {
   "name": "@infinite-list/data-model",
-  "version": "0.1.1-recycle-alpha.2",
+  "version": "0.1.1-recycle-alpha.3",
   "files": [
@@ -5,0 +5,0 @@ "dist",

src/ListDimensions.ts

@@ -907,3 +907,4 @@ import noop from '@x-oasis/noop';
 
-    const targetIndices = [];
+    const targetIndices = this._bufferSet.indices;
+
     const scrolling = actionType === 'scrollDown' || actionType === 'scrollUp';
@@ -914,21 +915,29 @@
 
-    for (let index = bufferedStartIndex; index < visibleStartIndex; index++) {
-      const position = this.getPosition(
-        index,
-        bufferedStartIndex,
-        visibleStartIndex
-      );
-      if (position !== null) targetIndices[position] = index;
+    if (visibleEndIndex >= 0) {
+      for (let index = visibleStartIndex; index <= visibleEndIndex; index++) {
+        const position = this.getPosition(
+          index,
+          visibleStartIndex,
+          visibleEndIndex
+        );
+        if (position !== null) targetIndices[position] = index;
+      }
     }
 
-    if (bufferedEndIndex >= 0) {
-      for (
-        let index = visibleEndIndex + 1;
-        index <= bufferedEndIndex;
-        index++
-      ) {
+    const bufferSize = Math.floor(
+      (this.recycleThreshold -
+        Math.max(visibleEndIndex - visibleStartIndex, 0)) /
+        2
+    );
+
+    for (
+      let index = visibleStartIndex, size = bufferSize;
+      size >= 0;
+      size--, index--
+    ) {
+      if (index >= 0) {
         const position = this.getPosition(
           index,
-          visibleEndIndex + 1,
-          bufferedEndIndex
+          bufferedStartIndex,
+          visibleStartIndex
         );
@@ -939,8 +948,12 @@ if (position !== null) targetIndices[position] = index;
 
-    if (visibleEndIndex >= 0) {
-      for (let index = visibleStartIndex; index <= visibleEndIndex; index++) {
+    for (
+      let index = visibleEndIndex + 1, size = bufferSize;
+      size >= 0;
+      size--, index++
+    ) {
+      if (index >= 0) {
         const position = this.getPosition(
           index,
-          visibleStartIndex,
-          visibleEndIndex
+          visibleEndIndex + 1,
+          bufferedEndIndex
         );
@@ -947,0 +960,0 @@ if (position !== null) targetIndices[position] = index;

src/struct/IntegerBufferSet.ts

@@ -45,2 +45,11 @@ // import invariant from 'invariant';
 
+  get indices() {
+    const indices = [];
+    for (const key in this._valueToPositionMap) {
+      const value = this._valueToPositionMap[key];
+      indices[value] = key;
+    }
+    return indices;
+  }
+
   getValuePosition(value: number): null | number {
@@ -47,0 +56,0 @@ if (this._valueToPositionMap[value] === undefined) {

No alert changes

Improved metrics

Total package byte prevSize

1534783

increased by0.29%

Lines of code

16594

increased by0.3%

No dependency changes