帮助系统
这些类为应用程序提供在线帮助,采用 3 细节级别:
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Tool Tips and Status Bar message - flyweight help, extremely brief, entirely integrated in the user interface, requiring little or no user interaction to invoke.
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What's This? - 轻量,但可以是三段式解释。
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Online Help - can encompass any amount of information, but is typically slower to call up, somewhat separated from the user's work, and often users feel that using online help is a digression from their real task.