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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.

    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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    0
    • 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 Offline
        JonBJ Offline
        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 Offline
            JonBJ Offline
            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
              0
              • 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
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                  • 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 Offline
                    JonBJ Offline
                    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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