vc作图，已画好的红框随着鼠标的移动而移动，当鼠标点击后，红框停在鼠标点击的位置后再变化-vc mapping, has drawn a good red frame and moves with the mouse when the mouse click, mouse click to stop the red line and then change position

编写一个应用程序，当按下鼠标左键键时，窗口显示“LEFT BUTTON” 当按下鼠标右键键时，窗口显示“RIGHT BUTTON” 窗口分为五个区域，颜色分别为白、绿、蓝、黄、红。当鼠标在五个区域移动时显示不同的样式。 -Write an application, when you press the left mouse button, the window display LEFT BUTTON when you press the right mouse button, a wi