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How to make QToolTip::showText anchor from bottom left?

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #7

    Searching back parents is a bad sign. You should rather send the tooltip content using signal and slots and let the widget you want to show the tooltip on handle the position.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

    S 1 Reply Last reply
    2
    • SGaistS SGaist

      Searching back parents is a bad sign. You should rather send the tooltip content using signal and slots and let the widget you want to show the tooltip on handle the position.

      S Offline
      S Offline
      student
      wrote on last edited by
      #8

      @SGaist since I can't get the tip in the yellow region, so call parent, but still not exactly in the yellow region. the issue for me is how to get the position of the yellow region.

      mrjjM 1 Reply Last reply
      0
      • S student

        @SGaist since I can't get the tip in the yellow region, so call parent, but still not exactly in the yellow region. the issue for me is how to get the position of the yellow region.

        mrjjM Offline
        mrjjM Offline
        mrjj
        Lifetime Qt Champion
        wrote on last edited by mrjj
        #9

        @student
        Hi
        This :
        QPoint pos = this->parentWidget()->parentWidget()->parentWidget()->parentWidget()->
        Is just a disaster waiting to happen and cannot be recommended.

        What is more fun to do is to make a small custom widget and use signals and slots.
        So in MainWindow we add a new signal

        signals:
            void ShowToolTipYellow(QString text);
        
        and we can then use it like
        
        void MainWindow::on_pushButton_released()
        {
            emit ShowToolTipYellow("HELLO");
        }
        
        we also need to connect the new signal to your custom widget which we often do in MainWins constructor
        
         ui->setupUi(this);
        ...
            connect(this, &MainWindow::ShowToolTipYellow, ui->yellow, &YellowToolTipBox::ShowToolTip  );
        

        Then to the custom object

        #ifndef YELLOWTOOLTIPBOX_H
        #define YELLOWTOOLTIPBOX_H
        
        #include <QWidget>
        #include <QPainter>
        #include <qtooltip.h>
        
        class YellowToolTipBox : public QWidget
        {
            Q_OBJECT
        public:
            explicit YellowToolTipBox(QWidget *parent = nullptr) : QWidget(parent) {}
        public slots:
            void ShowToolTip(QString Text) {
                QPoint pos = mapToGlobal(QPoint(0, 0));
                QToolTip::showText(pos, Text);
            }
        protected:
            // not really needed but was instead of stylesheet
            virtual void paintEvent(QPaintEvent *event) override
            {
                QPainter p(this);
                p.setBrush(Qt::yellow);
                p.drawRect(0,0, width()-1, height()-1);
            }
        };
        
        #endif // YELLOWTOOLTIPBOX_H
        
        

        Then to use our custom widget, we use the promote feature of Creator
        https://doc.qt.io/qt-5/designer-using-custom-widgets.html
        alt text
        We just tell it the name of the class (YellowToolTipBox) and which .h file it lives in
        Then Press Add, then press Promote.

        Then when we run

        alt text

        test project:
        https://www.dropbox.com/s/2xqs994yb8hvzih/tooltiptest.zip?dl=0

        Main advantages is reusability and resilient to change.
        Even if you add or remove "parents" , it still works
        alt text

        Where as the old code
        this->parentWidget()->parentWidget()->
        would either crash or simply dont work as expected.

        S 1 Reply Last reply
        1
        • mrjjM mrjj

          @student
          Hi
          This :
          QPoint pos = this->parentWidget()->parentWidget()->parentWidget()->parentWidget()->
          Is just a disaster waiting to happen and cannot be recommended.

          What is more fun to do is to make a small custom widget and use signals and slots.
          So in MainWindow we add a new signal

          signals:
              void ShowToolTipYellow(QString text);
          
          and we can then use it like
          
          void MainWindow::on_pushButton_released()
          {
              emit ShowToolTipYellow("HELLO");
          }
          
          we also need to connect the new signal to your custom widget which we often do in MainWins constructor
          
           ui->setupUi(this);
          ...
              connect(this, &MainWindow::ShowToolTipYellow, ui->yellow, &YellowToolTipBox::ShowToolTip  );
          

          Then to the custom object

          #ifndef YELLOWTOOLTIPBOX_H
          #define YELLOWTOOLTIPBOX_H
          
          #include <QWidget>
          #include <QPainter>
          #include <qtooltip.h>
          
          class YellowToolTipBox : public QWidget
          {
              Q_OBJECT
          public:
              explicit YellowToolTipBox(QWidget *parent = nullptr) : QWidget(parent) {}
          public slots:
              void ShowToolTip(QString Text) {
                  QPoint pos = mapToGlobal(QPoint(0, 0));
                  QToolTip::showText(pos, Text);
              }
          protected:
              // not really needed but was instead of stylesheet
              virtual void paintEvent(QPaintEvent *event) override
              {
                  QPainter p(this);
                  p.setBrush(Qt::yellow);
                  p.drawRect(0,0, width()-1, height()-1);
              }
          };
          
          #endif // YELLOWTOOLTIPBOX_H
          
          

          Then to use our custom widget, we use the promote feature of Creator
          https://doc.qt.io/qt-5/designer-using-custom-widgets.html
          alt text
          We just tell it the name of the class (YellowToolTipBox) and which .h file it lives in
          Then Press Add, then press Promote.

          Then when we run

          alt text

          test project:
          https://www.dropbox.com/s/2xqs994yb8hvzih/tooltiptest.zip?dl=0

          Main advantages is reusability and resilient to change.
          Even if you add or remove "parents" , it still works
          alt text

          Where as the old code
          this->parentWidget()->parentWidget()->
          would either crash or simply dont work as expected.

          S Offline
          S Offline
          student
          wrote on last edited by
          #10

          @mrjj appreciate for your reply. maybe I didn't describe what I want clearly. see this picture.
          Standard tooltip looks fine for me, I just want to make anchor point the QToolTip always at the "red" dot. nothing else, just this. so I was asking how to make the anchor from bottom left.
          Please let me know if you have idea can help me.Example.png

          1 Reply Last reply
          0
          • mrjjM Offline
            mrjjM Offline
            mrjj
            Lifetime Qt Champion
            wrote on last edited by
            #11

            Hi

            well if you place a YellowToolTipBox there then it would come there.

            But normally a tooltip comes at the widget that shows it so it's unclear if you means just
            for Button Dock WIdget or for all tooltips.

            S 1 Reply Last reply
            0
            • mrjjM mrjj

              Hi

              well if you place a YellowToolTipBox there then it would come there.

              But normally a tooltip comes at the widget that shows it so it's unclear if you means just
              for Button Dock WIdget or for all tooltips.

              S Offline
              S Offline
              student
              wrote on last edited by
              #12

              @mrjj no, I only want to set the bottom left point of QToolTip at the red dot, not using bottom dock wdiegt, bottom dock widget is not used for tool tip. and my QToolTip is used to display information of objects on the canvas. not widget's tooltip.

              mrjjM 1 Reply Last reply
              0
              • S student

                @mrjj no, I only want to set the bottom left point of QToolTip at the red dot, not using bottom dock wdiegt, bottom dock widget is not used for tool tip. and my QToolTip is used to display information of objects on the canvas. not widget's tooltip.

                mrjjM Offline
                mrjjM Offline
                mrjj
                Lifetime Qt Champion
                wrote on last edited by
                #13

                @student
                Ok that way.
                well you could put YellowToolTipBox and it will work.
                If you put setAttribute(Qt::WA_TransparentForMouseEvents) on it
                and removed its paintEvent if would be transparent and you can paint through it
                if that is needed.

                S 1 Reply Last reply
                0
                • mrjjM mrjj

                  @student
                  Ok that way.
                  well you could put YellowToolTipBox and it will work.
                  If you put setAttribute(Qt::WA_TransparentForMouseEvents) on it
                  and removed its paintEvent if would be transparent and you can paint through it
                  if that is needed.

                  S Offline
                  S Offline
                  student
                  wrote on last edited by
                  #14

                  @mrjj haha, if we can put a widget at the location I want, why can't we put the QToolTip at the location? for native QTooltip, it's good for me, just want to adjust the location:-)

                  mrjjM 1 Reply Last reply
                  0
                  • S student

                    @mrjj haha, if we can put a widget at the location I want, why can't we put the QToolTip at the location? for native QTooltip, it's good for me, just want to adjust the location:-)

                    mrjjM Offline
                    mrjjM Offline
                    mrjj
                    Lifetime Qt Champion
                    wrote on last edited by
                    #15

                    @student
                    ok, well that can ofcause work too via mapToGlobal if you get the right parent
                    so mapToGlabal does it right.

                    S 1 Reply Last reply
                    0
                    • mrjjM mrjj

                      @student
                      ok, well that can ofcause work too via mapToGlobal if you get the right parent
                      so mapToGlabal does it right.

                      S Offline
                      S Offline
                      student
                      wrote on last edited by
                      #16

                      @mrjj mapToGlobal can get the global position and pass it to QToolTips::showText(pos, info), but looks this will make the QToolTip's upper left point to the given pos, right? what I want is make the lower left point of QToolTips always at the red point. I am not sure you get my point.

                      mrjjM 1 Reply Last reply
                      0
                      • S student

                        @mrjj mapToGlobal can get the global position and pass it to QToolTips::showText(pos, info), but looks this will make the QToolTip's upper left point to the given pos, right? what I want is make the lower left point of QToolTips always at the red point. I am not sure you get my point.

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #17

                        @student

                        Im not 100% sure how you want to align it but tooltip it self also add some offset as seen with Yellow as its at 0,0 but is show a little down and to the left.

                        But yes the tooltip is shown with the point given as base. and then add some offset itself.

                        1 Reply Last reply
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