draw crop rectangle when viewing a cropped photo

Program.cs

@@ -126,8 +126,8 @@ public class CropTool : ITool {
     }
 
     var (left, right, top, bottom) = GetCrop();
-
     Vector2i size = new(right - left, bottom - top);
+
     status = $"({left}, {top}) {size.X}x{size.Y}";
 
     Rectangle crop = Rectangle.Empty;
@@ -167,27 +167,6 @@ public class CropTool : ITool {
   }
 
   public void Draw(UiGeometry geometry, Game game) {
-    if (activePhoto.CropRectangle == Rectangle.Empty) {
-      return;
-    }
-
-    Vector2i leftTop = game.ImageToScreen(activePhoto.CropRectangle.Left, activePhoto.CropRectangle.Top);
-    Vector2i rightBottom = game.ImageToScreen(activePhoto.CropRectangle.Right, activePhoto.CropRectangle.Bottom);
-    var (left, top) = leftTop;
-    var (right, bottom) = rightBottom;
-
-    Color4 shadeColor = new Color4(0, 0, 0, 0.75f);
-    game.DrawFilledBox(new Box2i(0, 0, left, geometry.PhotoBox.Max.Y), shadeColor);
-    game.DrawFilledBox(new Box2i(left, 0, geometry.PhotoBox.Max.X, top), shadeColor);
-    game.DrawFilledBox(new Box2i(left, bottom, geometry.PhotoBox.Max.X, geometry.PhotoBox.Max.Y), shadeColor);
-    game.DrawFilledBox(new Box2i(right, top, geometry.PhotoBox.Max.X, bottom), shadeColor);
-    game.DrawBox(new Box2i(left, top, right, bottom), 1, Color4.White);
-    game.DrawBox(new Box2i(left - 1, top - 1 , right + 1, bottom + 1), 1, Color4.Black);
-    game.DrawBox(new Box2i(left - 2, top - 2 , right + 2, bottom + 2), 1, Color4.White);
-    game.DrawHorizontalLine(left, Util.Lerp(top, bottom, 1.0 / 3), right, Color4.White);
-    game.DrawHorizontalLine(left, Util.Lerp(top, bottom, 2.0 / 3), right, Color4.White);
-    game.DrawVerticalLine(Util.Lerp(left, right, 1.0 / 3), top, bottom, Color4.White);
-    game.DrawVerticalLine(Util.Lerp(left, right, 2.0 / 3), top, bottom, Color4.White);
   }
 
   public string Status() {
@@ -712,6 +691,8 @@ public class Game : GameWindow {
   protected override void OnUpdateFrame(FrameEventArgs e) {
     base.OnUpdateFrame(e);
 
+    Photo previousPhoto = photos[photoIndex];
+
     KeyboardState input = KeyboardState;
 
     bool shiftIsDown = input.IsKeyDown(Keys.LeftShift) || input.IsKeyDown(Keys.RightShift);
@@ -860,6 +841,10 @@ public class Game : GameWindow {
     }
 
     // Handle tool switching.
+    if (photos[photoIndex] != previousPhoto) {
+      activeTool = viewTool;
+    }
+
     if (activeTool == viewTool) {
       if (input.IsKeyPressed(Keys.C)) {
         activeTool = new CropTool(photos[photoIndex]);
@@ -867,7 +852,6 @@ public class Game : GameWindow {
     }
 
     // Delegate input to the active tool.
-    activeTool.SetActivePhoto(photos[photoIndex]);
     ToolState state = activeTool.HandleInput(geometry, KeyboardState, MouseState, this);
 
     // Change back to the default tool if the active tool is done.
@@ -1076,6 +1060,8 @@ public class Game : GameWindow {
       Texture star = (activePhoto.Rating > i) ? STAR_FILLED : STAR_EMPTY;
       DrawTexture(star, geometry.StarBoxes[i].Min.X, geometry.StarBoxes[i].Min.Y);
     }
+    bool cropActive = activeTool.GetType().Name == "CropTool";
+    DrawCropRectangle(cropActive);
 
     // Draw thumbnail boxes.
     ribbonIndex = Math.Clamp(photoIndex - (geometry.ThumbnailBoxes.Count - 1) / 2, 0, Math.Max(0, photos.Count - geometry.ThumbnailBoxes.Count));
@@ -1113,6 +1099,31 @@ public class Game : GameWindow {
     }
   }
 
+  void DrawCropRectangle(bool active) {
+    Photo activePhoto = photos[photoIndex];
+    if (activePhoto.CropRectangle == Rectangle.Empty) {
+      return;
+    }
+
+    Vector2i leftTop = ImageToScreen(activePhoto.CropRectangle.Left, activePhoto.CropRectangle.Top);
+    Vector2i rightBottom = ImageToScreen(activePhoto.CropRectangle.Right, activePhoto.CropRectangle.Bottom);
+    var (left, top) = leftTop;
+    var (right, bottom) = rightBottom;
+
+    Color4 shadeColor = new Color4(0, 0, 0, 0.75f);
+    DrawFilledBox(new Box2i(0, 0, left, geometry.PhotoBox.Max.Y), shadeColor);
+    DrawFilledBox(new Box2i(left, 0, geometry.PhotoBox.Max.X, top), shadeColor);
+    DrawFilledBox(new Box2i(left, bottom, geometry.PhotoBox.Max.X, geometry.PhotoBox.Max.Y), shadeColor);
+    DrawFilledBox(new Box2i(right, top, geometry.PhotoBox.Max.X, bottom), shadeColor);
+    DrawBox(new Box2i(left, top, right, bottom), 1, Color4.White);
+    if (active) {
+      DrawHorizontalLine(left, Util.Lerp(top, bottom, 1.0 / 3), right, Color4.White);
+      DrawHorizontalLine(left, Util.Lerp(top, bottom, 2.0 / 3), right, Color4.White);
+      DrawVerticalLine(Util.Lerp(left, right, 1.0 / 3), top, bottom, Color4.White);
+      DrawVerticalLine(Util.Lerp(left, right, 2.0 / 3), top, bottom, Color4.White);
+    }
+  }
+
   public Vector2i ScreenToImage(int x, int y) {
     int rx = (int) ((x - activeOffset.X) / activeScale);
     rx = Math.Clamp(rx, 0, photos[photoIndex].Size.X);