将参数传递给插槽 [英] Passing an argument to a slot

问题描述

我想用一堆 QActions 和 QMenus 覆盖 mouseReleaseEvent...

I want to override mouseReleaseEvent with a bunch of QActions and QMenus...

connect(action1, SIGNAL(triggered()), this, SLOT(onStepIncreased()));

connect(action5, SIGNAL(triggered()), this, SLOT(onStepIncreased()));

connect(action10, SIGNAL(triggered()), this, SLOT(onStepIncreased()));

connect(action25, SIGNAL(triggered()), this, SLOT(onStepIncreased()));

connect(action50, SIGNAL(triggered()), this, SLOT(onStepIncreased()));

所以我想向槽 onStepIncreased 传递一个参数(你可以想象它们是 1、5、10、25、50).你知道我该怎么做吗?

So I want to pass an argument to the slot onStepIncreased (as you can imagine they are 1,5,10,25,50). Do you know how I can do it?

推荐答案

使用 QSignalMapper.像这样:

QSignalMapper* signalMapper = new QSignalMapper (this) ;
connect (action1, SIGNAL(triggered()), signalMapper, SLOT(map())) ;
connect (action5, SIGNAL(triggered()), signalMapper, SLOT(map())) ;
connect (action10, SIGNAL(triggered()), signalMapper, SLOT(map())) ;
connect (action25, SIGNAL(triggered()), signalMapper, SLOT(map())) ;
connect (action50, SIGNAL(triggered()), signalMapper, SLOT(map())) ;

signalMapper -> setMapping (action1, 1) ;
signalMapper -> setMapping (action5, 5) ;
signalMapper -> setMapping (action10, 10) ;
signalMapper -> setMapping (action25, 25) ;
signalMapper -> setMapping (action50, 50) ;

connect (signalMapper, SIGNAL(mapped(int)), this, SLOT(onStepIncreased(int))) ;

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