根据程序的状态，鼠标按下事件，应该开始绘制一条直线，或者选中一个对象。
Depending on the state of the program, a mouse down might start drawing a line, or it might select an object.
如果在Tk鼠标被按下Submit之后立即提取事件，cnee程序将不会提取鼠标按下事件(及后续释放事件)。
If events are extracted immediately after the Tk mouse is pressed on Submit, the mouse-down event (and subsequent release event) will not be picked up by the cnee program.
生成鼠标键按下和释放事件。
当鼠标事件触发的时候，鼠标哪个按钮被按下。
The button number that was pressed when the mouse event was fired.
遮注册了“暴露”事件以及鼠标按钮在给定窗口按下的事件。
This registers for "expose" events as well as for mouse button presses inside the given window.
遮注册了“暴露”事件以及鼠标按钮在给定窗口按下的事件。
This registers for "expose" events as well as for mouse button presses inside the given window.
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