修正鼠标滚轮侦听器后，您将可以不用按钮和滚动窗格。
When the mouse wheel listener bug is fixed, you'll be able to remove the use of the button and scroll pane.
JScrollPane组件甚至随预注册的侦听器一起提供，所以当这个组件获得焦点且用户移动鼠标滚轮时窗格将会滚动。
The JScrollPane component even comes with a pre-registered listener, so the pane will scroll when it has focus and the user moves the wheel.
通过点击鼠标按键，滚动滚轮来导航和聚焦窗口和框架，或者完全的通过键盘来操作。
Windows and frames are navigated and focused on any mouse button click, including rolling the wheel, or alternatively driven entirely by the keyboard.
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