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QLabel and right click

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  • PerdrixP Perdrix

    Yes, I'm using auto-connect and I don't get any warnings about Qt being unable to connect the signals to the slots (as I did when I originally tried to use on_backgroundCalibration_clicked() - that definitely got a complaint.

    JonBJ Online
    JonBJ Online
    JonB
    wrote on last edited by
    #8

    @Perdrix
    Please at least put a qDebug()/breakpoint inside your slot to verify being called, just in case it is being called and you (somehow) can't see the menu!

    1 Reply Last reply
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    • PerdrixP Perdrix

      Yes, I'm using auto-connect and I don't get any warnings about Qt being unable to connect the signals to the slots (as I did when I originally tried to use on_backgroundCalibration_clicked() - that definitely got a complaint.

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #9

      @Perdrix The auto-connect feature is not that reliable. I would try with explicit connect. If it complains then post your connect call here and the error.

      https://forum.qt.io/topic/113070/qt-code-of-conduct

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      • PerdrixP Offline
        PerdrixP Offline
        Perdrix
        wrote on last edited by Perdrix
        #10

        I added:

        connect(ui->backgroundCalibration, SIGNAL(linkActivated(const Qstring &)), this, SLOT(on_backgroundCalibration_linkActivated()));

        to the ctor code just after the ui->SetupUI() call.

        I have a breakpoint inside the slot code at the line that is intended to raise the menu, but it is never reached.

        David

        JonBJ 1 Reply Last reply
        0
        • PerdrixP Perdrix

          I added:

          connect(ui->backgroundCalibration, SIGNAL(linkActivated(const Qstring &)), this, SLOT(on_backgroundCalibration_linkActivated()));

          to the ctor code just after the ui->SetupUI() call.

          I have a breakpoint inside the slot code at the line that is intended to raise the menu, but it is never reached.

          David

          JonBJ Online
          JonBJ Online
          JonB
          wrote on last edited by
          #11

          @Perdrix
          If that is a paste of your code, Qstring is mis-spelt. You would get help if that is not connecting the slot if you changed to new-style signal-slot syntax, which would benefit you in the long run.

          1 Reply Last reply
          3
          • PerdrixP Perdrix

            I have a QLabel called backgroundCalibration whose text I have set to "<a>Some text</a>"

            I did:

            ui->backgroundCalibration->setVisible(true);
ui->backgroundCalibration->setTextInteractionFlags(Qt::LinksAccessibleByMouse);
ui->backgroundCalibration->setForegroundRole(QPalette::Link);

void	StackingParameters::on_backgroundCalibration_linkActivated(const QString & str)
{
	str;
	//
	// Show the popup menu 
	//
	backgroundCalibrationMenu->exec(QCursor::pos());
}

            When I display the Widget containing this label the text is displayed as "Some Text" and is displayed in Blue as I expected.

            However when I right-click left-click the text nothing happens! What crucial step did I miss?

            TIA
            David

            B Offline
            B Offline
            Bonnie
            wrote on last edited by Bonnie
            #12

            @Perdrix
            You cannot use "<a>Some text</a>" to expect a linkActivated signal.
            You must set some text as the link: "<a href="any text">Some text</a>", or the text won't even look like linked.

            JonBJ PerdrixP 2 Replies Last reply
            3
            • B Bonnie

              @Perdrix
              You cannot use "<a>Some text</a>" to expect a linkActivated signal.
              You must set some text as the link: "<a href="any text">Some text</a>", or the text won't even look like linked.

              JonBJ Online
              JonBJ Online
              JonB
              wrote on last edited by
              #13

              @Bonnie
              Good spot, as usual @Bonnie! Might be nice if the Qt docs reminded us of this somewhere, I didn't see much on what you had to do to a QLabel to make it a clickable link.

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              • PerdrixP Offline
                PerdrixP Offline
                Perdrix
                wrote on last edited by
                #14

                Yes I spotted that just after I posted and fixed it.

                So the code now reads:

                connect(ui->backgroundCalibration, SIGNAL(linkActivated(const QString &)), this, SLOT(on_backgroundCalibration_linkActivated(const QString &)));

                and received no nastygrams about non-existent signals. Sadly the breakpoint is still not reached.

                PS what's the new format for connecting the signals and slots? My book is strictly old school Qt4

                David

                jsulmJ 1 Reply Last reply
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                • PerdrixP Perdrix

                  Yes I spotted that just after I posted and fixed it.

                  So the code now reads:

                  connect(ui->backgroundCalibration, SIGNAL(linkActivated(const QString &)), this, SLOT(on_backgroundCalibration_linkActivated(const QString &)));

                  and received no nastygrams about non-existent signals. Sadly the breakpoint is still not reached.

                  PS what's the new format for connecting the signals and slots? My book is strictly old school Qt4

                  David

                  jsulmJ Offline
                  jsulmJ Offline
                  jsulm
                  Lifetime Qt Champion
                  wrote on last edited by
                  #15

                  @Perdrix Did you read what @Bonnie wrote?
                  https://wiki.qt.io/New_Signal_Slot_Syntax/de

                  https://forum.qt.io/topic/113070/qt-code-of-conduct

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                  • B Bonnie

                    @Perdrix
                    You cannot use "<a>Some text</a>" to expect a linkActivated signal.
                    You must set some text as the link: "<a href="any text">Some text</a>", or the text won't even look like linked.

                    PerdrixP Offline
                    PerdrixP Offline
                    Perdrix
                    wrote on last edited by
                    #16

                    @Bonnie Silly question - why can't I just use <a>Text</a>? It is after all a valid minimal HTML anchor?

                    I shall change the code immediately to use the format you suggested.

                    D.

                    JonBJ 1 Reply Last reply
                    0
                    • PerdrixP Perdrix

                      @Bonnie Silly question - why can't I just use <a>Text</a>? It is after all a valid minimal HTML anchor?

                      I shall change the code immediately to use the format you suggested.

                      D.

                      JonBJ Online
                      JonBJ Online
                      JonB
                      wrote on last edited by JonB
                      #17

                      @Perdrix
                      Because <a>Text</a> is not clickable in HTML, it just defines an anchor point user can jump to (via # on URL), see e.g. https://stackoverflow.com/questions/10510191/valid-to-use-a-anchor-tag-without-href-attribute.

                      1 Reply Last reply
                      1
                      • PerdrixP Offline
                        PerdrixP Offline
                        Perdrix
                        wrote on last edited by
                        #18

                        @Bonnie said in QLabel and right click:

                        href="any text"

                        Thanks Bonnie - that solved it ...

                        1 Reply Last reply
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