...rl->GetPos();//取得当前位置值 } VC通用控件编程之CStatusBar控件 （一）状态条控制的主要功能 状态条控制(Status Bar Control)比较容易理解，..
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将AllowOverwrite设置为true，会始终允许处理第二条控制消息，而不会考虑计时器的状态如何。
Setting AllowOverwrite to true will always allow the second control message to be processed, regardless of the state of the timer.
通过控制导航条的状态来跟踪和展示用户当前位置很困难，成本很大时，用它来替代标签。
Use instead of tabs when it would be prohibitively expensive to track and display the current location of the user as a state in the navigation control.
定义完状态，就能定义在状态之间的各种转场了。每个转场都会控制一条在一组样式和下一组样式之间切换的时间线。
After you define states, you can define transitions between the states. Each transition controls the timing of switching between one set of styles and the next.
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