/// <summary>
/// Updates the web view with the current sketch data
/// </summary>
/// <returns>an async task</returns>
public async Task UpdateWebViewAsync()
{
if (!_navigated)
{
return;
}
var sketchData = App.GetSketchData();
if (sketchData == null)
{
return;
}
await Task.Run(delegate
{
var base64 = InkRenderer.RenderImage(sketchData.Width, sketchData.Height, sketchData.InkStrokes, sketchData.BackgroundColor, 1024);
var script = $"imageUpdated('{base64}');";
if (Dispatcher == null)
{
return;
}
Dispatcher.BeginInvokeOnMainThread(async delegate
{
try
{
if (Preview == null)
{
return;
}
await Preview.EvaluateJavaScriptAsync(script).ConfigureAwait(false);
// There is a limit on the length of strings for the Preview.Eval() method.
}
catch (Exception e)
{
var properties = new Dictionary <string, string>
{
["ScriptLength"] = script.Length.ToString(CultureInfo.InvariantCulture)
};
Crashes.TrackError(e, properties);
}
});
GC.Collect();
}).ConfigureAwait(false);
}
/// <summary>
/// Gets the current zoom level
/// </summary>
/// <returns>an async task with the zoom level</returns>
public async Task <double> GetZoomLevelAsync()
{
var value = await Preview.EvaluateJavaScriptAsync("getZoomLevel();").ConfigureAwait(true);
return(double.Parse(value, CultureInfo.InvariantCulture));
}
