Sending signals between 2 cpp files back and forth without circular dependency?

[StudentScripter]

Hello,
what is the best approach to sending a string between two .cpp files without getting a circular dependency, without using a forward declaration?

Both widgets are inside dockwidgets which are both created inside the mainwindow:

mainwindow.cpp-->dockWidgetA.cpp-->QTreeView.cpp (send and receive a String here)

mainwindow.cpp-->dockWidgetB.cpp-->TextEdit.cpp (send and receive a String here)

Best regards
StudentScripter

[Pl45m4]

@StudentScripter

Depends. Signals and slots or pass it directly.
Why should there be a circular dependency?
You just dont include each others header :)
MainWindow knows about its childs but the children shouldnt know exactly about MainWindow. The connection is established in your MainWindow

[StudentScripter]

@Pl45m4 Yeah well but how can i pass from QTreeView.cpp to TextEdit.cpp? Thy don't know about each other and also Mainwindow.cpp does not know about the exact instances of QTreeView or TextEdit as they are declared to be children in their respective Dockwidget subclass.

[Pl45m4]

@StudentScripter

Then make use of the meta object tree (parent-child-structure).
The QDockWidget should be a parent of each widget while QMainWindow is parent of each QDockWidget:

In mainWindow something like:

QTreeView *view = this->findChild<QTreeView *>("objectname"); // when there are multiple TreeViews, you can specify an object name to get the right one
QTextEdit *edit = this->findChild<QTextEdit *>("textEdit_objectName"); // same here...

connect(edit, &QTextEdit::sendString, view, &QTreeView::displayString);

[StudentScripter]

@Pl45m4 Will try that, thank you very much for the quick response. :D