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(QObject * sender, int id)
void QSignalMapper::setMapping(QObject * sender, int id) SIGNAL
Adds a mapping so that when map() is signalled from the given sender, the signal mapped(id) is emitted.
There may be at most one integer ID for each sender. signal V.发信号
添加一个信号/槽映射关系，当QSignalMapper的槽map ()被sender的信号激活时(前提是sender的信号已经连接到
QSignalMapper的map()槽)，QSignalMapper就会以id作为参数产生信号mapped ( int id )。
QObject * QSignalMapper::mapping(int id) const
Returns the sender QObject that is associated with the id.
void QSignalMapper::map() SLOT
This slot emits signals based on which object sends signals to it.
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原文：http://www.cnblogs.com/584709796-qq-com/p/5287612.html