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Forum Update on Monday, May 27th 2025

Custom sighnal in main window not recognized?

Scheduled Pinned Locked Moved Solved General and Desktop
colordialogcustom signalsignal & slot
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  • BDC_PatrickB Offline
    BDC_PatrickB Offline
    BDC_Patrick
    wrote on last edited by BDC_Patrick
    #1

    Hi there.. again..

    Situation:
    I have a MainWindow called tgs_mainwindow, and a Dialog called dialog_programsettings.

    Inside the Settings, the user should be able to select a color as editor background.
    The Editor background color is changed in the mainwindow, via stylesheet.
    Like this:

    qss = QString("#Area_DisplayContents {background: #" + EditorColor + "}");
        ui->Area_DisplayContents->setStyleSheet(qss);
    

    Where EditorColor is a QString with "FFFFFF" Format (without #)

    The header of the dialog:

    class Dialog_ProgramSettings : public QDialog
    {
        Q_OBJECT
    
    public:
        explicit Dialog_ProgramSettings(QWidget *parent = nullptr);
        ~Dialog_ProgramSettings();
    
    signals:
        void recolorEditorUI();
    
    private:
        Ui::Dialog_ProgramSettings *ui;
    
    private slots:
        void ShowColorDialog();
        void recolorPreview(QColor col);
    };
    

    Has a custom signal inside it. It gets emitted via a function in cpp. The Function is called, cause a testimage gets recolored with this function, too.

    In the mainwindow cpp, i open the Dialog with this code:

                Dialog_ProgramSettings *dialog = new Dialog_ProgramSettings(this);
                dialog->setWindowTitle(tr("Einstellungen"));
                dialog->exec();
                connect(dialog, SIGNAL(recolorEditorUI()), this, SLOT(RecolorEditor()));
    

    RecolorEditor is the Function, that recolors the Background.
    This connection seems never to be triggered, cause the Background color never changes..

    What do i have to do, to make it work?

    1 Reply Last reply
    0
    • sierdzioS Offline
      sierdzioS Offline
      sierdzio
      Moderators
      wrote on last edited by
      #2

      Call connect() before you call exec() :-)

      Plus, two general remarks:

      • if only possible, use the new connect syntax
      • check return value of connect() to make sure the connection has actually been established

      (Z(:^

      BDC_PatrickB 1 Reply Last reply
      4
      • sierdzioS sierdzio

        Call connect() before you call exec() :-)

        Plus, two general remarks:

        • if only possible, use the new connect syntax
        • check return value of connect() to make sure the connection has actually been established
        BDC_PatrickB Offline
        BDC_PatrickB Offline
        BDC_Patrick
        wrote on last edited by
        #3

        @sierdzio Thank you very much :D

        1 Reply Last reply
        1

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