Mismatch between QtCreator and QtDesigner - implementing "connect"

Anonymous_Banned275

I have successfully implemented "connect" in QtDesigner - passing string from "list" to "plaintextEdit".

I can implement similar "connect " in code - especially the last parameter with the help of intelisnese - all "legal".

   connect(ui->list,
                &QListWidget::itemClicked ,
            ui->plainTextEdit,
           &QPlainTextEdit::addItem);

But the compiler throws an error:

/media/f/QT/Qt/QT/qtconnectivity/examples/bluetooth/CAT_BT_18112020/device.cpp:138: error: 'addItem' is not a member of 'QPlainTextEdit'
            &QPlainTextEdit::addItem);
             ^

connect(ui->list,
&QListWidget::itemClicked ,
ui->plainTextEdit,
&QPlainTextEdit::addItem);

What am I doing wrong ?

Pl45m4

@AnneRanch

QPlainTextEdit does not handle items... So it does not have any addItem function or slot.

It's
setPlainText
or
appendPlainText

Anonymous_Banned275

@Pl45m4 said in MIsmatch between QtCreator and QtDesigner - implementing "connect":

QPlainTextEdit does not handle items... So it does not have any addItem function or slot.
It's
setPlainText
or
appendPlainText

I made an error connecting two "lists", however when I connect list and plain text using append I get an error I am unable to decipher. It also looks as my signals are not in correct sequence.

They should be in
push button -> initialize and show dialog - that works fine.
dialog activated -> fill "list" with lines of text - that is done by original "btscan" connect and it is in QtDesigner (singal / slots ) and XML and that works too

when filling the list , each "new item" should generate a signal and copy the item to "plain text". That works only once, on first "new item" detected . This is my add implemented in QtDesigner. I am not sure why it does not work on all "new / chaged" items. That is a minor issue.

What is need is to copy "new" items to "parent " dialog.
Ideally using same slot which is filling the "child" dialog.
I do no know how to modify / add to XML ( and really cannot since it is system created anyway.)

I cannot do "cross object" conncet in QtDesigner and my attempts to do this in code failed ( posted elsewhere ).

After the above long and boring story - here are a simple and stupid question:

is it correct to implement "connect" in class constructor ?

to keep signals / slots in proper sequence - how do I verify that QtDesigner connection signals are "passed" to other object?

AKA how to debug / step thru QtDesigner XML code ?

Pl45m4

@AnneRanch said in MIsmatch between QtCreator and QtDesigner - implementing "connect":

is it correct to implement "connect" in class constructor ?

Short and simple answer: It depends.

In general: Yes, when the connection should be valid the whole life time of the object. Basically connections can be made everywhere (as long as they make sense).

how to debug / step thru QtDesigner XML code ?

You can't.
It's XML and no C++ class.

ui_CLASSNAME.h is the corresponding C++ header file to your CLASSNAME.ui. And since it's just a header, there is nothing really going on there. It only includes the widgets, you create in QtDesigner.

I do no know how to modify / add to XML

Just modify your QtDesigner file.