onZoomScaleChanged method
Event fired when the zoom scale of the WebView has changed.
oldScale
The old zoom scale factor.
newScale
The new zoom scale factor.
NOTE: available only on Android.
Official Android API: https://developer.android.com/reference/android/webkit/WebViewClient#onScaleChanged(android.webkit.WebView,%20float,%20float)
Official iOS API: https://developer.apple.com/documentation/uikit/uiscrollviewdelegate/1619409-scrollviewdidzoom
Implementation
void onZoomScaleChanged(double oldScale, double newScale) {}