remove SetActivePhoto() functions

Program.cs

@@ -62,7 +62,6 @@ public enum ToolState {
 
 
 public interface ITool {
-  void SetActivePhoto(Photo photo);
   ToolState HandleInput(UiGeometry geometry, KeyboardState input, MouseState mouse, Game game);
   string Status();
   void Draw(UiGeometry geometry, Game game);
@@ -70,12 +69,6 @@ public interface ITool {
 
 
 public class ViewTool : ITool {
-  Photo? activePhoto;
-
-  public void SetActivePhoto(Photo photo) {
-    activePhoto = photo;
-  }
-
   public ToolState HandleInput(UiGeometry geometry, KeyboardState input, MouseState mouse, Game game) {
     return ToolState.Active;
   }
@@ -101,14 +94,6 @@ public class CropTool : ITool {
     activePhoto = photo;
   }
 
-  public void SetActivePhoto(Photo photo) {
-    if (photo != activePhoto) {
-      mouseDragStart = Vector2i.Zero;
-      mouseDragEnd = Vector2i.Zero;
-    }
-    activePhoto = photo;
-  }
-
   public ToolState HandleInput(UiGeometry geometry, KeyboardState input, MouseState mouse, Game game) {
     Vector2i mousePosition = (Vector2i) mouse.Position;
     Vector2i imagePosition = game.ScreenToImage(mousePosition);