QSignMapper

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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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