帮助系统 ¶

Classes used to provide online-help for applications.

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? - lightweight, but can be a three-paragraph explanation.

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.

PySide2.QtWidgets.QToolTip	The QToolTip class provides tool tips (balloon help) for any widget.
PySide2.QtWidgets.QWhatsThis	The QWhatsThis class provides a simple description of any widget, i.e. answering the question “What’s This?”.
PySide2.QtWidgets.QStatusBar	QStatusBar 类提供适合呈现状态信息的水平条。
PySide2.QtGui.QHelpEvent	QHelpEvent 类提供用于在 Widget 中有关特定点请求有帮助信息的事件。
PySide2.QtGui.QStatusTipEvent	QStatusTipEvent 类提供用于在状态栏展示消息的事件。
PySide2.QtGui.QWhatsThisClickedEvent	The QWhatsThisClickedEvent class provides an event that can be used to handle hyperlinks in a “What’s This?” text.