CODEWITHSUNDEEP
c++qt
Cool_Coder
Cool_Coder

Reputation: 5073

How to recognise which QObject emitted a SIGNAL in Qt?

I have many QLineEdit's in my Main Window. I have a connected the editingFinished() SIGNAL of each object to a single SLOT in my QMainWindow class. I want to implement my own Undo/Redo functionality. I find the Qt Undo framework pretty difficult to understand & complex to implement. So I want to maintain a QList <QLineEdit *> undoList; which will store the sequence of QLineEdit's which were modified. I am maintaining an int variable to keep track of current state. When Undo/Redo is done I can simply update the int variable & find the QLineEdit which was edited at that state & then call undo() on that QLineEdit. Currently my biggest problem is that since I have connected all my QLineEdit's to a single SLOT, I have no information as to which QLineEdit emitted that SIGNAL. So I would like to know if there is any way by which I can understand which QLineEdit emitted the SIGNAL. Thank You.

Upvotes: 2

Views: 793

Answers (1)

cmannett85
cmannett85

Reputation: 22346

Use sender() inside the slot to get the the QObject that emitted the signal connected to it.

Upvotes: 8

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