一个更大的问题是当状态改变时对组件进行重新绘制。
A bigger issue is the repainting of the widgets when states change.
当一个实体的地位或者状态发生改变时。
当按钮状态发生改变时(通常是按钮被按下)，就会生成事件。
When the button state is changed (often by being pushed), the event will be generated.
当我们的状态发生改变时，人类的大脑经常就是这样工作的。
This is how human brain often works when our status changes.
这一事件被称为工作状态时，需要改变。
This event is called when status of job is needed to be changed.
说明：当窗口大小发生改变时，使状态栏随对话框的改变而改变。
When the window size is changed, so that the status bar change change with dialog.
当你的模型状态如下所示时改变到选择点模式。
When your model starts to look like on this picture change to vertex mode.
当你的模型状态如下所示时改变到选择点模式。
When your model starts to look like on this picture change to vertex mode.
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