Fixing drag and drop of files, the container was not added to the surface. Also fixed opening things from the clipboard.

src/Greenshot.Base/Core/ClipboardHelper.cs

@@ -494,7 +494,7 @@ EndSelection:<<<<<<<4
         {
             IDataObject clipboardData = GetDataObject();
             // Return the first image
-            foreach (Image clipboardImage in GetImages(clipboardData))
+            foreach (var clipboardImage in GetImages(clipboardData))
             {
                 return clipboardImage;
             }
@@ -507,11 +507,89 @@ EndSelection:<<<<<<<4
         /// Returned images must be disposed by the calling code!
         /// </summary>
         /// <param name="dataObject"></param>
-        /// <returns>IEnumerable of Image</returns>
-        public static IEnumerable<IDrawableContainer> GetImages(IDataObject dataObject)
+        /// <returns>IEnumerable of Bitmap</returns>
+        public static IEnumerable<Bitmap> GetImages(IDataObject dataObject)
         {
             // Get single image, this takes the "best" match
-            IDrawableContainer singleImage = GetImage(dataObject);
+            Bitmap singleImage = GetImage(dataObject);
+            if (singleImage != null)
+            {
+                Log.InfoFormat($"Got {singleImage.GetType()} from clipboard with size {singleImage.Size}");
+                yield return singleImage;
+                yield break;
+            }
+
+            var supportedExtensions = FileFormatHandlerRegistry.ExtensionsFor(FileFormatHandlerActions.LoadDrawableFromStream).ToList();
+
+            foreach (var fileData in IterateClipboardContent(dataObject))
+            {
+                var extension = Path.GetExtension(fileData.filename)?.ToLowerInvariant();
+                if (!supportedExtensions.Contains(extension))
+                {
+                    continue;
+                }
+
+                Bitmap bitmap = null;
+
+                try
+                {
+                    if (!FileFormatHandlerRegistry.TryLoadFromStream(fileData.stream, extension, out bitmap))
+                    {
+                        continue;
+                    }
+
+                }
+                catch (Exception ex)
+                {
+                    Log.Error("Couldn't read file contents", ex);
+                    continue;
+                }
+                finally
+                {
+                    fileData.stream?.Dispose();
+                }
+                // If we get here, there is an image
+                yield return bitmap;
+            }
+
+            // check if files are supplied
+            foreach (string imageFile in GetImageFilenames(dataObject))
+            {
+                var extension = Path.GetExtension(imageFile)?.ToLowerInvariant();
+                if (!supportedExtensions.Contains(extension))
+                {
+                    continue;
+                }
+
+                Bitmap bitmap = null;
+                using FileStream fileStream = new FileStream(imageFile, FileMode.Open, FileAccess.Read, FileShare.Read);
+                try
+                {
+                    if (!FileFormatHandlerRegistry.TryLoadFromStream(fileStream, extension, out bitmap))
+                    {
+                        continue;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Log.Error("Couldn't read file contents", ex);
+                    continue;
+                }
+                // If we get here, there is an image
+                yield return bitmap;
+            }
+        }
+
+        /// <summary>
+        /// Get all images (multiple if file names are available) from the dataObject
+        /// Returned images must be disposed by the calling code!
+        /// </summary>
+        /// <param name="dataObject"></param>
+        /// <returns>IEnumerable of IDrawableContainer</returns>
+        public static IEnumerable<IDrawableContainer> GetDrawables(IDataObject dataObject)
+        {
+            // Get single image, this takes the "best" match
+            IDrawableContainer singleImage = GetDrawable(dataObject);
             if (singleImage != null)
             {
                 Log.InfoFormat($"Got {singleImage.GetType()} from clipboard with size {singleImage.Size}");
@@ -585,11 +663,11 @@ EndSelection:<<<<<<<4
         /// </summary>
         /// <param name="dataObject"></param>
         /// <returns>Image or null</returns>
-        private static IDrawableContainer GetImage(IDataObject dataObject)
+        private static Bitmap GetImage(IDataObject dataObject)
         {
             if (dataObject == null) return null;
 
-            IDrawableContainer returnImage = null;
+            Bitmap returnImage = null;
             IList<string> formats = GetFormats(dataObject);
             string[] retrieveFormats;
 
@@ -635,6 +713,113 @@ EndSelection:<<<<<<<4
             return null;
         }
 
+        /// <summary>
+        /// Get an IDrawableContainer from the IDataObject, don't check for FileDrop
+        /// </summary>
+        /// <param name="dataObject"></param>
+        /// <returns>Image or null</returns>
+        private static IDrawableContainer GetDrawable(IDataObject dataObject)
+        {
+            if (dataObject == null) return null;
+
+            IDrawableContainer returnImage = null;
+            IList<string> formats = GetFormats(dataObject);
+            string[] retrieveFormats;
+
+            // Found a weird bug, where PNG's from Outlook 2010 are clipped
+            // So I build some special logic to get the best format:
+            if (formats != null && formats.Contains(FORMAT_PNG_OFFICEART) && formats.Contains(DataFormats.Dib))
+            {
+                // Outlook ??
+                Log.Info("Most likely the current clipboard contents come from Outlook, as this has a problem with PNG and others we place the DIB format to the front...");
+                retrieveFormats = new[]
+                {
+                    DataFormats.Dib, FORMAT_BITMAP, FORMAT_FILECONTENTS, FORMAT_PNG_OFFICEART, FORMAT_PNG, FORMAT_JFIF_OFFICEART, FORMAT_JPG, FORMAT_JPEG, FORMAT_JFIF,
+                    DataFormats.Tiff, FORMAT_GIF, FORMAT_HTML
+                };
+            }
+            else
+            {
+                retrieveFormats = new[]
+                {
+                    FORMAT_PNG_OFFICEART, FORMAT_PNG, FORMAT_17, FORMAT_JFIF_OFFICEART, FORMAT_JPG, FORMAT_JPEG, FORMAT_JFIF, DataFormats.Tiff, DataFormats.Dib, FORMAT_BITMAP,
+                    FORMAT_FILECONTENTS, FORMAT_GIF, FORMAT_HTML
+                };
+            }
+
+            foreach (string currentFormat in retrieveFormats)
+            {
+                if (formats != null && formats.Contains(currentFormat))
+                {
+                    Log.InfoFormat("Found {0}, trying to retrieve.", currentFormat);
+                    returnImage = GetDrawableForFormat(currentFormat, dataObject);
+                }
+                else
+                {
+                    Log.DebugFormat("Couldn't find format {0}.", currentFormat);
+                }
+
+                if (returnImage != null)
+                {
+                    return returnImage;
+                }
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Helper method to try to get an Bitmap in the specified format from the dataObject
+        /// the DIB reader should solve some issues
+        /// It also supports Format17/DibV5, by using the following information: https://stackoverflow.com/a/14335591
+        /// </summary>
+        /// <param name="format">string with the format</param>
+        /// <param name="dataObject">IDataObject</param>
+        /// <returns>Bitmap or null</returns>
+        private static Bitmap GetImageForFormat(string format, IDataObject dataObject)
+        {
+            Bitmap bitmap = null;
+
+            if (format == FORMAT_HTML)
+            {
+                var textObject = ContentAsString(dataObject, FORMAT_HTML, Encoding.UTF8);
+                if (textObject != null)
+                {
+                    var doc = new HtmlDocument();
+                    doc.LoadHtml(textObject);
+                    var imgNodes = doc.DocumentNode.SelectNodes("//img");
+                    if (imgNodes != null)
+                    {
+                        foreach (var imgNode in imgNodes)
+                        {
+                            var srcAttribute = imgNode.Attributes["src"];
+                            var imageUrl = srcAttribute.Value;
+                            Log.Debug(imageUrl);
+                            bitmap = NetworkHelper.DownloadImage(imageUrl);
+                            if (bitmap != null)
+                            {
+                                return bitmap;
+                            }
+                        }
+                    }
+                }
+            }
+
+            object clipboardObject = GetFromDataObject(dataObject, format);
+            var imageStream = clipboardObject as MemoryStream;
+            if (!IsValidStream(imageStream))
+            {
+                return clipboardObject as Bitmap;
+            }
+
+            // From here, imageStream is a valid stream
+            if (!FileFormatHandlerRegistry.TryLoadFromStream(imageStream, format, out bitmap))
+            {
+                return bitmap;
+            }
+            return null;
+        }
+
         /// <summary>
         /// Helper method to try to get an IDrawableContainer in the specified format from the dataObject
         /// the DIB reader should solve some issues
@@ -643,7 +828,7 @@ EndSelection:<<<<<<<4
         /// <param name="format">string with the format</param>
         /// <param name="dataObject">IDataObject</param>
         /// <returns>IDrawableContainer or null</returns>
-        private static IDrawableContainer GetImageForFormat(string format, IDataObject dataObject)
+        private static IDrawableContainer GetDrawableForFormat(string format, IDataObject dataObject)
         {
             IDrawableContainer drawableContainer = null;
 

src/Greenshot.Base/Core/FileFormatHandlers/FileFormatHandlerRegistry.cs

@@ -84,5 +84,28 @@ namespace Greenshot.Base.Core.FileFormatHandlers
 
             return fileFormatHandler.TryLoadDrawableFromStream(stream, extension, out drawableContainer, parentSurface);
         }
+
+        /// <summary>
+        /// Try to load a Bitmap from the stream
+        /// </summary>
+        /// <param name="stream">Stream</param>
+        /// <param name="extension">string</param>
+        /// <param name="bitmap">Bitmap out</param>
+        /// <returns>bool true if it was successful</returns>
+        public static bool TryLoadFromStream(Stream stream, string extension, out Bitmap bitmap)
+        {
+            var fileFormatHandler = FileFormatHandlers
+                .Where(ffh => ffh.Supports(FileFormatHandlerActions.LoadFromStream, extension))
+                .OrderBy(ffh => ffh.PriorityFor(FileFormatHandlerActions.LoadFromStream, extension))
+                .FirstOrDefault();
+
+            if (fileFormatHandler == null)
+            {
+                bitmap = null;
+                return false;
+            }
+
+            return fileFormatHandler.TryLoadFromStream(stream, extension, out bitmap);
+        }
     }
 }

src/Greenshot.Base/Core/NetworkHelper.cs

@@ -24,7 +24,6 @@ using System.Collections.Generic;
 using System.Drawing;
 using System.Globalization;
 using System.IO;
-using System.Linq;
 using System.Net;
 using System.Text;
 using System.Text.RegularExpressions;
@@ -145,6 +144,62 @@ namespace Greenshot.Base.Core
             return null;
         }
 
+        /// <summary>
+        /// Download the uri to create a Bitmap
+        /// </summary>
+        /// <param name="url">Of an image</param>
+        /// <returns>Bitmap</returns>
+        public static Bitmap DownloadImage(string url)
+        {
+            var extensions = string.Join("|", FileFormatHandlerRegistry.ExtensionsFor(FileFormatHandlerActions.LoadFromStream));
+
+            var imageUrlRegex = new Regex($@"(http|https)://.*(?<extension>{extensions})");
+            var match = imageUrlRegex.Match(url);
+            try
+            {
+                using var memoryStream = GetAsMemoryStream(url);
+                try
+                {
+                    if (FileFormatHandlerRegistry.TryLoadFromStream(memoryStream, match.Success ? match.Groups["extension"]?.Value : null, out var bitmap))
+                    {
+                        return bitmap;
+                    }
+                }
+                catch (Exception)
+                {
+                    // If we arrive here, the image loading didn't work, try to see if the response has a http(s) URL to an image and just take this instead.
+                    string content;
+                    using (var streamReader = new StreamReader(memoryStream, Encoding.UTF8, true))
+                    {
+                        content = streamReader.ReadLine();
+                    }
+
+                    if (string.IsNullOrEmpty(content))
+                    {
+                        throw;
+                    }
+
+                    match = imageUrlRegex.Match(content);
+                    if (!match.Success)
+                    {
+                        throw;
+                    }
+
+                    using var memoryStream2 = GetAsMemoryStream(match.Value);
+                    if (FileFormatHandlerRegistry.TryLoadFromStream(memoryStream2, match.Success ? match.Groups["extension"]?.Value : null, out var bitmap))
+                    {
+                        return bitmap;
+                    }
+                }
+            }
+            catch (Exception e)
+            {
+                Log.Error("Problem downloading the image from: " + url, e);
+            }
+
+            return null;
+        }
+
         /// <summary>
         /// Helper method to create a web request with a lot of default settings
         /// </summary>

src/Greenshot.Editor/Drawing/Surface.cs

@@ -935,7 +935,7 @@ namespace Greenshot.Editor.Drawing
                 }
             }
 
-            foreach (var drawableContainer in ClipboardHelper.GetImages(e.Data))
+            foreach (var drawableContainer in ClipboardHelper.GetDrawables(e.Data))
             {
                 drawableContainer.Left = mouse.X;
                 drawableContainer.Top = mouse.Y;
@@ -987,13 +987,11 @@ namespace Greenshot.Editor.Drawing
         {
             //create a blank bitmap the same size as original
             Bitmap newBitmap = ImageHelper.CreateEmptyLike(Image, Color.Empty);
-            if (newBitmap != null)
-            {
-                // Make undoable
-                MakeUndoable(new SurfaceBackgroundChangeMemento(this, null), false);
-                SetImage(newBitmap, false);
-                Invalidate();
-            }
+            if (newBitmap == null) return;
+            // Make undoable
+            MakeUndoable(new SurfaceBackgroundChangeMemento(this, null), false);
+            SetImage(newBitmap, false);
+            Invalidate();
         }
 
         /// <summary>
@@ -2057,12 +2055,13 @@ namespace Greenshot.Editor.Drawing
             {
                 Point pasteLocation = GetPasteLocation(0.1f, 0.1f);
 
-                foreach (var drawableContainer in ClipboardHelper.GetImages(clipboard))
+                foreach (var drawableContainer in ClipboardHelper.GetDrawables(clipboard))
                 {
                     if (drawableContainer == null) continue;
                     DeselectAllElements();
                     drawableContainer.Left = pasteLocation.X;
                     drawableContainer.Top = pasteLocation.Y; 
+                    AddElement(drawableContainer);
                     SelectElement(drawableContainer);
                     pasteLocation.X += 10;
                     pasteLocation.Y += 10;
@@ -2206,24 +2205,23 @@ namespace Greenshot.Editor.Drawing
         /// <param name="generateEvents">false to skip event generation</param>
         public void SelectElement(IDrawableContainer container, bool invalidate = true, bool generateEvents = true)
         {
-            if (!selectedElements.Contains(container))
-            {
-                selectedElements.Add(container);
-                container.Selected = true;
-                FieldAggregator.BindElement(container);
-                if (generateEvents && _movingElementChanged != null)
-                {
-                    SurfaceElementEventArgs eventArgs = new SurfaceElementEventArgs
-                    {
-                        Elements = selectedElements
-                    };
-                    _movingElementChanged(this, eventArgs);
-                }
+            if (selectedElements.Contains(container)) return;
 
-                if (invalidate)
+            selectedElements.Add(container);
+            container.Selected = true;
+            FieldAggregator.BindElement(container);
+            if (generateEvents && _movingElementChanged != null)
+            {
+                SurfaceElementEventArgs eventArgs = new SurfaceElementEventArgs
                 {
-                    container.Invalidate();
-                }
+                    Elements = selectedElements
+                };
+                _movingElementChanged(this, eventArgs);
+            }
+
+            if (invalidate)
+            {
+                container.Invalidate();
             }
         }
 

src/Greenshot.Editor/FileFormatHandlers/SvgFileFormatHandler.cs

@@ -22,10 +22,8 @@
 using System;
 using System.Collections.Generic;
 using System.Drawing;
-using System.Drawing.Imaging;
 using System.IO;
 using System.Linq;
-using Greenshot.Base.Core;
 using Greenshot.Base.Core.FileFormatHandlers;
 using Greenshot.Base.Interfaces;
 using Greenshot.Base.Interfaces.Drawing;
@@ -73,20 +71,16 @@ namespace Greenshot.Editor.FileFormatHandlers
         public bool TryLoadFromStream(Stream stream, string extension, out Bitmap bitmap)
         {
             var svgDocument = SvgDocument.Open<SvgDocument>(stream);
-            int width = (int)svgDocument.ViewBox.Width;
-            int height = (int)svgDocument.ViewBox.Height;
 
             try
             {
-                bitmap = ImageHelper.CreateEmpty(width, height, PixelFormat.Format32bppArgb, Color.Transparent);
-                svgDocument.Draw(bitmap);
+                bitmap = svgDocument.Draw();
                 return true;
             }
             catch (Exception ex)
             {
                 Log.Error("Can't load SVG", ex);
             }
-
             bitmap = null;
             return false;
         }