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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
    #2

    Hi,

    How are you showing the tooltip currently ?

    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
    0
    • SGaistS SGaist

      Hi,

      How are you showing the tooltip currently ?

      S Offline
      S Offline
      student
      wrote on last edited by
      #3

      @SGaist Hi, currently, when my mouse move to a position, I get the object under the mouse position, then use QToolTip::showText(pos,info), I try to get the global lower left pos of the centralWidget, but I can't get what I need.

      1 Reply Last reply
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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #4

        Are you using that widget geometry ?
        What are you currently getting ?

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

        S 2 Replies Last reply
        0
        • SGaistS SGaist

          Are you using that widget geometry ?
          What are you currently getting ?

          S Offline
          S Offline
          student
          wrote on last edited by
          #5

          @SGaist my top window is QMainWindow, and central widget is QMdiArea, and QWidget under QMdiArea, so I use the following way:
          int xOffSet = 27 ;//x offset to the mainwindow
          int yOffSet = 9 ;//y offset to the mainwindow
          int mainWinHeight = this->parentWidget()->parentWidget()->parentWidget()->height();
          QPoint pos = this->parentWidget()->parentWidget()->parentWidget()->parentWidget()->mapToGlobal(QPoint(xOffSet, mainWinHeight-yOffSet ));
          QToolTip::showText(pos, QString::fromStdString(info));

          The issue is, I can get exactly what I want, I want the toolTip window always just touch the QWidget

          1 Reply Last reply
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          • SGaistS SGaist

            Are you using that widget geometry ?
            What are you currently getting ?

            S Offline
            S Offline
            student
            wrote on last edited by
            #6

            @SGaist I want it always in the yellow rect:
            Example.png

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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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