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:

  1. Tool Tips and Status Bar message - flyweight help, extremely brief, entirely integrated in the user interface, requiring little or no user interaction to invoke.
  2. What's This? - 轻量,但可以是三段式解释。
  3. 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.
QHelpEvent 用于在 Widget 中有关特定点请求有帮助信息的事件
QStatusBar 适于呈现状态信息的水平条
QStatusTipEvent 用于在状态栏展示消息的事件
QToolTip 用于任何 Widget 的工具提示 (气球帮助)
QWhatsThis 任何 Widget 的简单描述,即回答 What's This? 问题
QWhatsThisClickedEvent 可用于处理 What's This? 文本中的超链接的事件