Add option to turn off thumbnails creation

Author: vladimir-litvinchik

src/GroupDocs.Viewer.UI.API/Controllers/ViewerController.cs

@@ -332,7 +332,7 @@ private async Task<List<PageData>> CreateViewDataPagesAndThumbs(FileCredentials
         {
             await _viewer.GetPagesAsync(file, pagesToCreate);
 
-            if (_config.EnableThumbnails)
+            if (_config.EnableThumbnails && _config.CreateThumbnails)
             {
                 await _viewer.GetThumbsAsync(file, pagesToCreate);
             }
@@ -346,7 +346,7 @@ private async Task<List<PageData>> CreateViewDataPagesAndThumbs(FileCredentials
                     var pageUrl = _apiUrlBuilder.BuildPageUrl(file.FilePath, page.Number, _viewer.PageExtension);
                     var thumbUrl = _apiUrlBuilder.BuildThumbUrl(file.FilePath, page.Number, _viewer.PageExtension);
 
-                    var pageData = _config.EnableThumbnails
+                    var pageData = _config.EnableThumbnails && _config.CreateThumbnails
                         ? new PageData(page.Number, page.Width, page.Height, pageUrl, thumbUrl)
                         : new PageData(page.Number, page.Width, page.Height, pageUrl);
 
@@ -366,7 +366,6 @@ private async Task<List<PageData>> CreateViewDataPages(FileCredentials file, Doc
         {
             await _viewer.GetPagesAsync(file, pagesToCreate);
 
-
             var pages = new List<PageData>();
             foreach (PageInfo page in docInfo.Pages)
             {
@@ -392,7 +391,7 @@ private async Task<List<PageData>> CreatePagesAndThumbs(FileCredentials file, Do
         {
             await _viewer.GetPagesAsync(file, pagesToCreate);
 
-            if (_config.EnableThumbnails)
+            if (_config.EnableThumbnails && _config.CreateThumbnails)
             {
                 await _viewer.GetThumbsAsync(file, pagesToCreate);
             }
@@ -404,7 +403,7 @@ private async Task<List<PageData>> CreatePagesAndThumbs(FileCredentials file, Do
                 var pageUrl = _apiUrlBuilder.BuildPageUrl(file.FilePath, page.Number, _viewer.PageExtension);
                 var thumbUrl = _apiUrlBuilder.BuildThumbUrl(file.FilePath, page.Number, _viewer.ThumbExtension);
 
-                var pageData = _config.EnableThumbnails
+                var pageData = _config.EnableThumbnails && _config.CreateThumbnails
                     ? new PageData(page.Number, page.Width, page.Height, pageUrl, thumbUrl)
                     : new PageData(page.Number, page.Width, page.Height, pageUrl);
 

src/GroupDocs.Viewer.UI.Core/Configuration/Config.cs

@@ -90,6 +90,12 @@ public class Config
         /// </summary>
         public bool EnableThumbnails { get; set; } = true;
 
+        /// <summary>
+        /// Enables or disables method that creates thumbnails.
+        /// Default value: <c>true</c>.
+        /// </summary>
+        public bool CreateThumbnails { get; set; } = true;
+
         /// <summary>
         /// Show or hide the zoom controls.
         /// Default value: <c>true</c>.