Golang : Qt update UI elements with core.QCoreApplication_ProcessEvents
Not a tutorial, but putting this here in case I need to refer back in future. While developing a Golang-Qt application recently, I found out that UI elements such as progress bar or progress dialog will not be updated without this line:
core.QCoreApplication_ProcessEvents(core.QEventLoop__AllEvents)
Why? Basically, a graphical user interface(GUI) Qt application needs to update/redraw itself....but doing so every second can be a resource hogging process.
From http://doc.qt.io/qt-5/qcoreapplication.html#processEvents:
In the event that you are running a local loop which calls this function continuously, without an event loop, the DeferredDelete events will not be processed. This can affect the behaviour of widgets, e.g. QToolTip, that rely on DeferredDelete events to function properly. An alternative would be to call sendPostedEvents() from within that local loop.
Calling this function processes events only for the calling thread.
Therefore, need to invoke the core.QCoreApplication_ProcessEvents(core.QEventLoop__AllEvents)
function to get Qt to update the UI elements such as a progress bar.
References:
http://doc.qt.io/qt-5/qcoreapplication.html#processEvents
https://www.socketloop.com/tutorials/golang-qt-progress-dialog-example
See also : Golang : Qt progress dialog example
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+5.1k Golang : Replace a parameter's value inside a configuration file example
+11.3k Golang : How to get hour, minute, second from time?
+9.6k Golang : Iterating Elements Over A List
+13.7k Golang : Find files by name - cross platform example
+6.9k Generate Random number with math/rand in Go
+3.3k Golang : Intercept and compare HTTP response code example
+3.9k Golang : Get SPF and DMARC from email headers to fight spam
+6.6k Golang : How to get year, month and day?
+5.4k Golang : Read until certain character to break for loop
+3.1k Android Studio : How to detect camera, activate and capture example
+2.6k Golang : Break string into a slice of characters example
+5.1k Golang : Create S3 bucket with official aws-sdk-go package