예제 #1
0
        /// <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);
        }
예제 #2
0
        /// <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);
        }
예제 #3
0
        /// <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);
        }