SingletonRect
SingletonRect is a term that appears in computer graphics and user interface programming, particularly within the context of Microsoft's Windows operating system and its associated APIs. It refers to a structure or object that represents a rectangular area on the screen. The "singleton" aspect suggests that in certain implementations or contexts, there might be a single, globally accessible instance of such a rectangle, or that the concept itself is a singular, unique entity within a given scope.
A RECT structure in Windows, for example, typically contains four integer members: left, top, right, and bottom,