For example, the bitmap for the focused state usually is like the one for the up state but with a dashed rectangle inset from the border or a thick solid line at the border.

• 例如，按钮获得焦点时的位图与未按下（或正常）状态的位图相同，但是在边框中要么嵌入了由间断线组成的矩形，要么嵌入了由粗实线组成的矩形。