Welcome to the Qt wiki. Here the Qt community has gathered information on Qt over the years. Everything here is created and maintained by New Signal Slot Syntax. I came across this weirdness in using PySide Slot decorator. If I decorate my method using CARSANDINSURANCE.INFO and if I try to access CARSANDINSURANCE.INFO() inside the method, I get None. If I remove the CARSANDINSURANCE.INFO Questo sito utilizza i cookie per migliorare servizi ed esperienza dei lettori. Se decidi di continuare la navigazione consideriamo che accetti il loro uso.
Sorry for the late reply as I was on vacation. An exception will be raised if the connection failed. The following code demonstrates the definition, connection and emit of a signal without arguments: Sorry for the bad example. I came across this weirdness in using PySide Slot decorator. Note that in my case, either removing Slot decorator or using old-style connections work. In this case it is the overload with the single integer argument.
Join Stack Overflow to learn, share knowledge, and build your career. How would you change this so that the second slider moves in the opposite direction as the first? Slider one would be initialized with these values:.
How would you implement the signal and slot to make this work? I would appreciate a working example that builds on the simple example above. Your example is a bit broken, because you forgot to set the parent of the layout, and also to save the slider widgets as member attributes to be accessed later But to answer your question, its really as simple as just pointing your connection to your own function:. Note how sliderChanged has the same signature as the original setValue slot.
Instead of connecting one widget directly to the other, you connect it to a custom method and then transform the value to what you want, and act how you want setting a custom value on stwo. You can connect signals to functions that do things. Your code isn't structured to do that easily and required refactoring, so you can do it the easy way:. Here's the way I did it.
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Join Stack Overflow to learn, share knowledge, and build your career. I came across this weirdness in using PySide Slot decorator. If I decorate my method using QtCore. Slot and if I try to access self.
If I remove the QtCore. I get the sender properly. Here is a minimal example. The problem is that the object that receive the signal your Worker class lives in another thread. The pointer is valid only during the execution of the slot that calls this function from this object's thread context. The pointer returned by this function becomes invalid if the sender is destroyed, or if the slot is disconnected from the sender's signal. This function violates the object-oriented principle of modularity.
However, getting access to the sender might be useful when many signals are connected to a single slot. As mentioned above, the return value of this function is not valid when the slot is called via a Qt:: DirectConnection from a thread different from this object's thread. Do not use this function in this type of scenario.
If you don't move the object to the other thread, it works the examples is in python3, but it will work in python 2, after changing the print lines:.
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