TrayIcon fires an ActionEvent on a single left mouse click and displays the pop-up menu on a single right mouse click.

TrayIcon在鼠标左键单击时将触发actionevent，而在鼠标右击时则显示弹出菜单。

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While holding down the mouse button, a user can manipulate the arrow keys to move the selection up, down, left, or right-one pixel at a time.

维持鼠标按键按下的状态下，用户可以操控箭头键将所选对象向上、下、左或右每次移动1个像素。

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