ui: Prefer +/- operators to apply offsets.

ui/gfx/rect.h

Index: ui/gfx/rect.h
diff --git a/ui/gfx/rect.h b/ui/gfx/rect.h
index 5479d2e2b0319de060fd0d0d73067c9e01bf225e..d555996a8316a74dae33b4fcde80d72e2a2fbdde 100644
--- a/ui/gfx/rect.h
+++ b/ui/gfx/rect.h
@@ -77,6 +77,9 @@ inline bool operator!=(const Rect& lhs, const Rect& rhs) {
   return !(lhs == rhs);
 }
 
+UI_EXPORT Rect operator+(const Rect& lhs, const Vector2d& rhs);
+UI_EXPORT Rect operator-(const Rect& lhs, const Vector2d& rhs);

[Peter Kasting, 2012/11/09 22:02:36]

Nit: Probably want to define operators for the opposite argument order too?

[danakj, 2012/11/09 22:10:10]

I was wondering about that as well.

Is it as easy to see that "Vector - Rect" is going to move the rect though? I
feel like this way is a lot clearer, and I'd rather avoid the other one if we
can.

+
 UI_EXPORT Rect IntersectRects(const Rect& a, const Rect& b);
 UI_EXPORT Rect UnionRects(const Rect& a, const Rect& b);
 UI_EXPORT Rect SubtractRects(const Rect& a, const Rect& b);