signal-connect | Connect Signals Graphs To React | Frontend Utils library
kandi X-RAY | signal-connect Summary
kandi X-RAY | signal-connect Summary
Connect your signal graphs to ReactJs Components!.
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QUESTION
I am developing a small user interface for a home-project. I created a *.ui file with QT-Designer. This is my main window with some navigations buttons, labels and so on. Now I am struggeling to load another *.ui (for example with content) in the frame or widget of the main window when I click on navgation buttons. I am using pyqt4 and I have to implement it with python on an raspberry pi.
I also used the search but I did not find an working solution for my problem. Maybe it is really easy but for me it is difficultly.
*Important: I don't want to reorganize buttons and labels! I want to load a whole *.ui file in a widget or frame which is in the main window!
Here my code examples: The following is my main.py
...ANSWER
Answered 2018-Dec-26 at 00:40First of all, the basis of my solution is the promotion of a widget, for this I will structure the project in the following way:
QUESTION
I would like to use lambdas with g_signal_connect()
from Gtk+.
Traditionally works like this to setup a callback function:
ANSWER
Answered 2018-Apr-03 at 20:13When you look at the definition of G_CALLBACK
, you see that it's merely a cast to a void (*)()
. This is Gtk+ employing a form of type erasure on the pointer types it receives, removing the argument list.
The lambda defines a (closure) object type. It's not a function. And while a capture-less lambda does have an implicit conversion operator to a function pointer, that pointer has a signature that matches the lambda's parameter list.
So you may convert the lambda to a void(*)(GtkApplication*, gpointer)
, but not directly to a void (*)()
since it's a completely unrelated type.
The workaround is to make the lambda convert into a function pointer type before feeding it to G_CALLBACK
for the cast. One neat trick that does it, is appending a +
before the lambda:
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