Move Expansion. Add Expansion overload to Surface.

(cherry picked from commit 64bfddb8daf7175fb0889f4af68a3c8ca3d97ade)

src/Greenshot.Base/Interfaces/Drawing/IDrawableContainer.cs

@@ -37,6 +37,14 @@ namespace Greenshot.Base.Interfaces.Drawing
         BOTTOM,
     }
 
+    public struct Expansion
+    {
+        public int Left;
+        public int Right;
+        public int Top;
+        public int Bottom;
+    }
+
     public interface IDrawableContainer : INotifyPropertyChanged, IDisposable
     {
         /// <summary>

src/Greenshot.Base/Interfaces/ISurface.cs

@@ -205,6 +205,7 @@ namespace Greenshot.Base.Interfaces
 
         void SendMessageEvent(object source, SurfaceMessageTyp messageType, string message);
         void ResizeCanvas(int left, int right, int top, int bottom);
+        void ResizeCanvas(Expansion expansion);
         void ApplyBitmapEffect(IEffect effect);
         void RemoveCursor();
         bool HasCursor { get; }

src/Greenshot.Editor/Drawing/DrawableContainerList.cs

@@ -937,11 +937,10 @@ namespace Greenshot.Editor.Drawing
         /// <param name="targetElement"></param>
         public void PushOut(Direction direction, ISurface surface, IDrawableContainer targetElement)
         {
-            var expansion = GetExpansionFromSize(direction, targetElement.Size);
-            
-            surface.ResizeCanvas(expansion.Left, expansion.Right, expansion.Top, expansion.Bottom);
+            Expansion expansion = GetExpansionFromSize(direction, targetElement.Size);
             
             targetElement.SnapToEdge(direction, surface);
+            surface.ResizeCanvas(expansion);
 
             if (direction == Direction.LEFT || direction == Direction.RIGHT)
                 targetElement.SnapToEdge(Direction.TOP, surface);
@@ -952,12 +951,12 @@ namespace Greenshot.Editor.Drawing
         }
 
         /// <summary>
-        /// Calculate the one-directional expansion needed to accommodate an element of the given size.
+        /// Calculate the directional expansion needed to accommodate an element of the given size.
         /// </summary>
         /// <param name="direction">The direction in which to expand.</param>
         /// <param name="elementSize">The size of the element to accommodate.</param>
         /// <returns></returns>
-        public static Expansion GetExpansionFromSize(Direction direction, Size elementSize)
+        private static Expansion GetExpansionFromSize(Direction direction, Size elementSize)
         {
             var expansion = new Expansion();
 

src/Greenshot.Editor/Drawing/Expansion.cs

@@ -1,31 +0,0 @@
-/*
- * Greenshot - a free and open source screenshot tool
- * Copyright (C) 2007-2021 Thomas Braun, Jens Klingen, Robin Krom
- * 
- * For more information see: https://getgreenshot.org/
- * The Greenshot project is hosted on GitHub https://github.com/greenshot/greenshot
- * 
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 1 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-namespace Greenshot.Editor.Drawing
-{
-    public struct Expansion
-    {
-        public int Left;
-        public int Right;
-        public int Top;
-        public int Bottom;
-    }
-}

src/Greenshot.Editor/Drawing/Surface.cs

@@ -1054,6 +1054,17 @@ namespace Greenshot.Editor.Drawing
             _surfaceExpanded(this, null);
         }
 
+        /// <summary>
+        /// Set the canvas to a new size using the given expansion directions.
+        /// </summary>
+        /// <param name="expansion">The amount to expand in each direction.</param>
+        public void ResizeCanvas(Expansion expansion)
+        {
+            var resizeEffect = new ResizeCanvasEffect(expansion.Left, expansion.Right, expansion.Top, expansion.Bottom);
+            ApplyBitmapEffect(resizeEffect);
+            _surfaceExpanded(this, null);
+        }
+
         /// <summary>
         /// Apply a bitmap effect to the surface
         /// </summary>