Qt Signal Slot Mapper
As you can see the macros used in header files for signals are defined as public. As for the explicit statet public,private,protected directives, these are ignored in the signals section. Prior 5.0 versions of QT have signals defined as protected. Those were still available for connections using the SIGNAL macro. The slots macro # define slots. Further properties of signal/slots. Qt provides the QObject::sender function, which returns a pointer to the object that sent the signal Note: if the slot was not activated by a signal, the return is undefined. Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal.
The objects' signals can then be connected to the map slot which will emit the mapped signal with the string or integer associated with the original signalling object. Mappings can be removed later using removeMappings. A signal mapper is constructed and for each text in the list a QPushButtonis created. We connect each button's clickedsignal to the signal mapper's map slot, and create a mapping in the signal mapper from each button to the button's text. Finally we connect the signal mapper's mapped signal to the custom widget's clickedsignal. The connection mechanism uses a vector indexed by signals. But all the slots waste space in the vector and there are usually more slots than signals in an object. So from Qt 4.6, a new internal signal index which only includes the signal index is used. While developing with Qt, you only need to know about the absolute method index.
Say I a widget A and a vector of widget B's (the number of which is only known at runtime and is dynamic)
I would like a signal / slot relationship between A and all B's, such that I can choose the slot of which of the widget B's recieves the signal.
i.e some sort of emit widgetASignal (slotOfWidgetB_X, double amount)
Qt Signal Slot Mapper Download
Now, I am aware of QSignalMapper, but as far as I can tell that is for the counterpart of what I would like i.e QSignalMaper would be vector of widget B's, one of which sends a signal, and widget A slot recieves the signal and can work out which of widget B's it came from.
I want to do the opposite here, and emit a signal defined in widgetA and it get to only one of the instances of widgetB.
Qt Signal Slot Mapper Bot
Any help much appreciated.