<itemvalue="Evaluates a JavaScript expression in the context of the current page. On Android returns the evaluation result as a JSON formatted string. On iOS depending on the value type the return value would be one of: - For primitive JavaScript types: the value string formatted (e.g JavaScript 100 returns '100'). - For JavaScript arrays of supported types: a string formatted NSArray(e.g '(1,2,3), note that the string for NSArray is formatted and might contain newlines and extra spaces.'). - Other non-primitive types are not supported on iOS and will complete the Future with an error. The Future completes with an error if a JavaScript error occurred, or on iOS, if the type of the evaluated expression is not supported as described above. When evaluating Javascript in a [WebView], it is best practice to wait for the [WebView.onPageFinished] callback. This guarantees all the Javascript embedded in the main frame HTML has been loaded."/>
<itemvalue="The center slice for a nine-patch image. The region of the image inside the center slice will be stretched both horizontally and vertically to fit the image into its destination. The region of the image above and below the center slice will be stretched only horizontally and the region of the image to the left and right of the center slice will be stretched only vertically. The stretching will be applied in order to make the image fit into the box specified by [fit]. When [centerSlice] is not null, [fit] defaults to [BoxFit.fill], which distorts the destination image size relative to the image's original aspect ratio. Values of [BoxFit] which do not distort the destination image size will result in [centerSlice] having no effect (since the nine regions of the image will be rendered with the same scaling, as if it wasn't specified)."/>
