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fix(performance): Improved `onScroll` to work efficiently on Android (#609)

ifsnow 5 年之前
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共有 1 個檔案被更改,包括 19 行新增1 行删除
  1. 19
    1
      android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java

+ 19
- 1
android/src/main/java/com/reactnativecommunity/webview/RNCWebViewManager.java 查看文件

@@ -435,6 +435,11 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
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     view.getSettings().setGeolocationEnabled(isGeolocationEnabled != null && isGeolocationEnabled);
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   }
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+  @ReactProp(name = "onScroll")
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+  public void setOnScroll(WebView view, boolean hasScrollEvent) {
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+    ((RNCWebView) view).setHasScrollEvent(hasScrollEvent);
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+  }
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+
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   @Override
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   protected void addEventEmitters(ThemedReactContext reactContext, WebView view) {
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     // Do not register default touch emitter and let WebView implementation handle touches
@@ -784,7 +789,8 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
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     protected @Nullable
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     RNCWebViewClient mRNCWebViewClient;
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     protected boolean sendContentSizeChangeEvents = false;
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-    private final OnScrollDispatchHelper mOnScrollDispatchHelper = new OnScrollDispatchHelper();
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+    private OnScrollDispatchHelper mOnScrollDispatchHelper;
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+    protected boolean hasScrollEvent = false;
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     /**
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      * WebView must be created with an context of the current activity
@@ -800,6 +806,10 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
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       this.sendContentSizeChangeEvents = sendContentSizeChangeEvents;
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     }
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+    public void setHasScrollEvent(boolean hasScrollEvent) {
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+      this.hasScrollEvent = hasScrollEvent;
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+    }
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+
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     @Override
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     public void onHostResume() {
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       // do nothing
@@ -894,6 +904,14 @@ public class RNCWebViewManager extends SimpleViewManager<WebView> {
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     protected void onScrollChanged(int x, int y, int oldX, int oldY) {
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       super.onScrollChanged(x, y, oldX, oldY);
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+      if (!hasScrollEvent) {
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+        return;
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+      }
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+
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+      if (mOnScrollDispatchHelper == null) {
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+        mOnScrollDispatchHelper = new OnScrollDispatchHelper();
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+      }
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+
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       if (mOnScrollDispatchHelper.onScrollChanged(x, y)) {
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         ScrollEvent event = ScrollEvent.obtain(
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                 this.getId(),