onZoomScaleChanged property Null safety

(void Function?(InAppWebViewController controller, double oldScale, double newScale)?) onZoomScaleChanged
final

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

final void Function(
        InAppWebViewController controller, double oldScale, double newScale)?
    onZoomScaleChanged;