Mice with a scroll wheel as a middle mouse button are fairly popular, so support is being added. 用一个滚动轮作为鼠标中键(MMB)的鼠标非常流行,所以增加了对它的支持。
Occurs when the user presses and then releases the middle mouse button over a control. 当用户在一个控件上按下并释放鼠标的中间键时则发生。
Set if the middle mouse button is down. 鼠标中间键是否被按下。
Mark this check box to use the left mouse button to create a clipboard and to use the middle mouse button to paste. 勾选该选项时,使用鼠标左键创建一个剪贴板并使用鼠标中键(MMB)来粘贴。
Use the left mouse button to select an object, the right button to deselect the object and middle mouse button or spacebar to center on the selected object. 用鼠标左键可以选择天体,右键可以放弃选择。鼠标中键(MMB)或者空格键则可以将选中的天体调整到屏幕中央。