don't grad the photo around unless the drag starts in the photobox

Program.cs

@@ -87,20 +87,26 @@ public class Transform {
 }
 
 public interface ITool {
-  ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo);
+  ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo, UiGeometry geometry);
   string Status();
   void Draw(UiGeometry geometry, Game game);
 }
 
-
 public class ViewTool : ITool {
-  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo) {
+  private bool dragging = false;
+
+  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo, UiGeometry geometry) {
     Vector2i mousePosition = (Vector2i) mouse.Position;
-    if (mouse.IsButtonDown(MouseButton.Button1)) {
+    if (mouse.IsButtonPressed(MouseButton.Button1) && geometry.PhotoBox.ContainsInclusive(mousePosition)) {
+      dragging = true;
+    }
+    if (!mouse.IsButtonDown(MouseButton.Button1)) {
+      dragging = false;
+    }
+    if (dragging) {
       Vector2 delta = mouse.Delta;
       Vector2i imageDelta = transform.ScreenToImageDelta((int) delta.X, (int) delta.Y);
       photo.ViewOffset = Vector2i.Add(photo.ViewOffset, imageDelta);
-      Console.WriteLine("+++ " + photo.ViewOffset);
     }
 
     return ToolStatus.Active;
@@ -129,7 +135,7 @@ public class CropTool : ITool {
     mouseDragEnd = new(photo.CropRectangle.Right, photo.CropRectangle.Bottom);
   }
 
-  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo) {
+  public ToolStatus HandleInput(KeyboardState input, MouseState mouse, Transform transform, Game game, Photo photo, UiGeometry geometry) {
     Vector2i mousePosition = (Vector2i) mouse.Position;
     Vector2i imagePosition = transform.ScreenToImage(mousePosition);
 
@@ -630,7 +636,7 @@ public class Game : GameWindow {
 
     // Delegate input to the active tool.
     ToolStatus status = activeTool.HandleInput(
-        KeyboardState, MouseState, transform, this, photos[photoIndex]);
+        KeyboardState, MouseState, transform, this, photos[photoIndex], geometry);
 
     // Change back to the default tool if the active tool is done.
     if (status != ToolStatus.Active) {