设计一个跟踪鼠标移动的窗口。窗口中间添加一个蓝色背景白色文字的标签，在标签上显示鼠标指针当前坐标值。在窗口下方添加一个按钮，点击按钮可以在停止跟踪和继续跟踪之间进行切换-Designed to track the mouse movement a window. Middle of the window to add a blue background, white text label, the label displays the current mouse pointer coordinates. Add a button in the window below, click the button to stop the track and continue to follow in the switch between