How do I change the font Size of a QTextEdit in QMainWindow from another class.

Tobias88

Hello, I've been searching days for answers now and I am just too stupid to understand this. I have got the QMainWindow with the QTextEditor and I have got the QDialog where I want to change it by 1 on a button press. I already came up with this to change the font size atleast in the QMainWindow class:

QTextCursor cursor = ui.editor->textCursor();
    cursor.select(QTextCursor::Document);
    ui.editor->setTextCursor(cursor);
    ui.editor->setFontPointSize(size);
    cursor.clearSelection();
    ui.editor->setTextCursor(cursor);

but I need to change it in the QDialog class. How do I do this? I mean, it can't be impossible, right?

Thank you very much for reading!

JonB

@Tobias88
Don't change it from another class. Use a dialog to get a value from the user, have it return the value to the window/text edit which then sets its font size.

Tobias88

I got the answer with the help of @JonB.
I made a getter and a setter for the int that is the size.
I made an temporary int in the other class, then called the getter and set this to the value of the temporary integer:

mainWindow mW;
tempInt = mW.getValue();

then I made it bigger by one and used the setter to set the original value of the mainWindow class:

tempInt++;
mW.setValue(tempInt);

In the header of the mainWinow class, I declared the QDialog class:

dialogClass *dC;

In the mainWindow class itself, I used the exec(); method to check if the QDialog is closed and then set font size of the QTextEditor:

dC = new dialogClass(this);
if(dC.exec() = 0){
/*0 = rejected (what we need to see if it is closed), 1 = accepted (didn't click the X button, but clicked any other button like 'OK' or sth)*/
QTextCursor cursor = ui.textEditor->textCursor();
    cursor.select(QTextCursor::Document);
    ui.textEditor->setTextCursor(cursor);
    ui.textEditor->setFontPointSize(size);
    cursor.clearSelection();
    ui.textEditor->setTextCursor(cursor);
}

This is the solution for me.