They generally keep track of pointer movements and changes in input focus and adjust the enlarged view accordingly.
它们通常不断跟踪指针的移动和输入焦点的改变,然后相应地调整放大的窗口。
2
This simple design, possible because the data obeys strict LIFO order, means that no complex data structure is needed to track stack contents - a simple pointer to the top of the stack will do.