[noob] How can I have a widget event call a function?

[Envergure]

I'm transitioning from Visual BASIC to Qt.

Let's say I want to have a button change colour when it's clicked. How do I arrange for the click to trigger a function that changes its colour?

[wysota]

You need to use a feature called "signals and slots". Open Qt Assistant and enter "Signals and Slots" into the index tab.

[Envergure]

OK, interesting...

I connect my button's "clicked()" signal to its own "click()" slot, and I have myButton::click() change the colour? Or do I have to make a custom slot (and to do that do I need to make a custom "myQButton" class)?


Basically, can I have my button change colour by editing only main.cpp and mainWidow.cpp?

[fnmblot]

http://doc.trolltech.com/4.4/index.html is your best friend. I use it on a daily basis.

[wysota]

You need to create your own custom slot somewhere (like in mainWindow.cpp) and connect the signal to it. Inside the slot you need to perform the changes you want.

[Envergure]

Yay, it's working!

I had to call my button by "ui.pushButton" instead of just "pushButton". Otherwise I got "pushButton not declared in this scope."