async Task NavigationComplete(WKWebView webView, string filename, PageSize pageSize, PageMargin margin, TaskCompletionSource <ToFileResult> taskCompletionSource)
{
try
{
var widthString = await webView.EvaluateJavaScriptAsync("document.documentElement.offsetWidth");
var width = double.Parse(widthString.ToString());
var heightString = await webView.EvaluateJavaScriptAsync("document.documentElement.offsetHeight");
var height = double.Parse(heightString.ToString());
if (width < 1 || height < 1)
{
taskCompletionSource.SetResult(new ToFileResult(true, "WebView has zero width or height"));
return;
}
webView.ClipsToBounds = false;
webView.ScrollView.ClipsToBounds = false;
var bounds = webView.Bounds;
webView.Bounds = new CGRect(0, 0, (nfloat)width, (nfloat)height);
var scale = pageSize.Width / width;
var snapshotConfig = new WKSnapshotConfiguration
{
SnapshotWidth = pageSize.Width / Display.Scale
};
var image = await webView.TakeSnapshotAsync(snapshotConfig);
if (image.AsPNG() is NSData data)
{
var path = Path.Combine(ToPngService.FolderPath(), filename + ".png");
File.WriteAllBytes(path, data.ToArray());
taskCompletionSource.SetResult(new ToFileResult(false, path));
return;
}
webView.Bounds = bounds;
taskCompletionSource.SetResult(new ToFileResult(true, "No data returned."));
}
catch (Exception e)
{
taskCompletionSource.SetResult(new ToFileResult(true, "Exception: " + e.Message + (e.InnerException != null
? "Inner exception: " + e.InnerException.Message
: null)));
}
finally
{
webView.Dispose();
}
}