Hi , I have gone through the documentation, and spent some times to understand how is the magic work between signal and slots. So far, I have already understood the signal and slots on high level abstraction. 4 lenses of education. However, this 'emit' pseudo-keyword is really confusing for novice guy like me. Some said its a syntactic sugar, some said there is a moc -object that works with emit(). I wanted to know how,where, when , why to apply this emit() pseudo -keyword . Perhaps we can start with the example provided in the documentation.
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Hi , I have gone through the documentation, and spent some times to understand how is the magic work between signal and slots. So far, I have already understood the signal and slots on high level abstraction. 4 lenses of education. However, this 'emit' pseudo-keyword is really confusing for novice guy like me. Some said its a syntactic sugar, some said there is a moc -object that works with emit(). I wanted to know how,where, when , why to apply this emit() pseudo -keyword . Perhaps we can start with the example provided in the documentation.
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From what i understand from that code. valueChanged() this function will 'track' has 'm_value' changed to new value yet? If yes , then 'send' the signal to the setValue this SLOT to perform operation . is my interpretation correct? if yes, why still to implement 'emit valueChanged(value) ' in the SLOT function ? else please correct my interpretation .Thank you
Qt Development General and Desktop SOLVED Connecting signal and slot between parent and 'grandchild' Important: Please read the Qt Code of Conduct. The Qt signals/slots and property system are based on the ability to introspect the objects at runtime. Introspection means being able to list the methods and properties of an object and have all kinds of information about them such as the type of their arguments. QtScript and QML would have hardly been possible without that ability.
Qt Connect Signal Slot
- Signals and slots are loosely coupled: a class which emits a signal neither knows nor cares which slots receive the signal. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type.
- Signals and slots are used for communication between objects. Signal/slot mechanism is a central feature of Qt and probably the part that differs most from other toolkits. In most GUI toolkits widgets have a callback for each action they can.
