Slot to color background of line edit on textedited

I have the following code to change the background of a line edit when it is edited by the user:

Code:

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ProgramMain::ProgramMain() {
    connect( ui.vendorname, SIGNAL( textEdited() ), this, SLOT( colorbackground() ) );
}
 
 
ProgramMain::colorbackground() {
    ui.vendorname->setStyleSheet( QString( "background-color: yellow"));
}

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This works, however I have many line edits in the UI file and I would like to have them all change color if the user edits them.

is there any way I can make a single slot that can handle any line edit? Or will I need to make a slot for each line edit that I want to change the color for?

1) Use QObject::sender() to identify the line edit being edited:

Code:

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connect( lineEditA, SIGNAL( textEdited() ), this, SLOT(colorbackground() ) );
connect( lineEditB, SIGNAL( textEdited() ), this, SLOT(colorbackground() ) );
 
ProgramMain::colorbackground() {
      QLineEdit* lineEdit = qobject_cast<QLineEdit*>(sender());
      if (lineEdit)
          lineEdit->setStyleSheet(...);
}

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2) Use QSignalMapper

awesome! this was exactly what I was looking for :)

I put this code to action and I got the following error on the command line:

Quote:

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no such signal QlineEdit::textEdited()

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I looked in the docs and QlineEdit should have this signal. What could be missing?

Quote:

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Originally Posted by tpf80

I looked in the docs and QlineEdit should have this signal. What could be missing?

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Looks like a parameter is missing. So it should be:

Code:

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connect( ui.vendorname, SIGNAL( textEdited( const QString& ) ), this, SLOT( colorbackground() ) );

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yes this was the issue.. so silly of me to forget that parameter! Thanks so much for your help!