/// <summary>
/// Creates a PNG from the contents of a Xamarin.Forms.WebView
/// </summary>
/// <param name="webView">Xamarin.Forms.WebView</param>
/// <param name="fileName">Name (not path), excluding suffix, of PDF file</param>
/// <param name="pageSize">PDF page size, in points. (default based upon user's region)</param>
/// <param name="margin">PDF page's margin, in points. (default is zero)</param>
/// <returns>Forms9Patch.ToFileResult</returns>
public static async Task <ToFileResult> ToPdfAsync(this Xamarin.Forms.WebView webView, string fileName, PageSize pageSize = default, PageMargin margin = default)
{
_platformToPdfService = _platformToPdfService ?? DependencyService.Get <IToPdfService>();
if (_platformToPdfService == null)
{
throw new NotSupportedException("Cannot get HtmlService: must not be supported on this platform.");
}
ToFileResult result = null;
using (var indicator = ActivityIndicatorPopup.Create())
{
if (pageSize is null || pageSize.Width <= 0 || pageSize.Height <= 0)
{
pageSize = PageSize.Default;
}
margin = margin ?? new PageMargin();
if (pageSize.Width - margin.HorizontalThickness < 1 || pageSize.Height - margin.VerticalThickness < 1)
{
return(new ToFileResult(true, "Page printable area (page size - margins) has zero width or height."));
}
result = await _platformToPdfService.ToPdfAsync(webView, fileName, pageSize, margin);
await indicator.CancelAsync();
}
await Task.Delay(50);
return(result);
}
/// <summary>
/// Creates a PNG from the contents of a Xamarin.Forms.WebView
/// </summary>
/// <param name="webView"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public static async Task <ToFileResult> ToPdfAsync(this Xamarin.Forms.WebView webView, string fileName)
{
_platformToPdfService = _platformToPdfService ?? DependencyService.Get <IToPdfService>();
if (_platformToPdfService == null)
{
throw new NotSupportedException("Cannot get HtmlService: must not be supported on this platform.");
}
ToFileResult result = null;
using (var indicator = ActivityIndicatorPopup.Create())
{
result = await _platformToPdfService.ToPdfAsync(webView, fileName);
}
await Task.Delay(50);
return(result);
}
/// <summary>
/// Creates a PNG from the contents of a Xamarin.Forms.WebView
/// </summary>
/// <param name="webView">Xamarin.Forms.WebView</param>
/// <param name="fileName">Name (not path), excluding suffix, of PNG file</param>
/// <param name="width">Width of resulting PNG (in pixels).</param>
/// <returns></returns>
public static async Task <ToFileResult> ToPngAsync(this Xamarin.Forms.WebView webView, string fileName, int width = -1)
{
_platformToPngService = _platformToPngService ?? DependencyService.Get <IToPngService>();
if (_platformToPngService == null)
{
throw new NotSupportedException("Cannot get HtmlService: must not be supported on this platform.");
}
ToFileResult result = null;
using (var indicator = ActivityIndicatorPopup.Create())
{
if (width <= 0)
{
width = (int)Math.Ceiling((PageSize.Default.Width - (12 * 25.4)) * 4);
}
result = await _platformToPngService.ToPngAsync(webView, fileName, width);
}
await Task.Delay(50);
return(result);
}
