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  4. How to change the QToolButton opacity when the cursor is on int?
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How to change the QToolButton opacity when the cursor is on int?

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  • Pl45m4P Pl45m4

    @nanor

    Not QDialog's enter event, QToolButton's.
    Then you can install an eventFilter to handle the mouse enter / leave events and apply the opacity effect (that's how I would do it and have done with a custom widget before).
    In addition, I think, you also need to enable mouse tracking on your widget (your QToolButton), in order to track the mouse movement, even when there is no real action like mouse clicks happening.

    Add this to your Dialog.h

    protected:
        bool eventFilter(QObject *obj, QEvent *event) override;
    

    then re-implement it just about like this:

    bool Dialog::eventFilter(QObject *obj, QEvent *event)
    {
        if(obj == YOUR_BUTTON)
        {
            if(event->type() == QEvent::Enter)
            {
                // SET YOUR OPACITY
            }
            else if(event->type() == QEvent::Leave)
            {
               // SET OPACITY BACK TO NORMAL
            }
            return true;
        }
        else
        {
            return QDialog::eventFilter(obj, event);
        }
    }
    

    Don't forget:
    (put this in your cpp file, in your dialog constructor)

       // enable mouse tracking
       YOUR_BUTTON->setMouseTracking(true);
       // Install event filter on your button
       YOUR_BUTTON->installEventFilter(this); // this = your dialog
    

    You can also add animation effects to make it look smooth. Otherwise you get some 2-state behavior, instant opaque when the mouse left the button and your pre-set value, as soon as it enters again.

    QPropertyAnimation *animation = new QPropertyAnimation(effect, "opacity");
        animation->setDuration(1000); // duration time in msecs
        animation->setStartValue(1); // 1 to fadeOut, start with 0.5 (or some X<1) to fadeIn
        animation->setEndValue(0.5); // change end value with start value
        animation->setEasingCurve(QEasingCurve::InQuart); // OutQuart for fadeOut
        animation->start(QPropertyAnimation::DeleteWhenStopped);
    

    This can be called here, for example:

    if(event->type() == QEvent::Enter)
    {
    // SET YOUR OPACITY
    }
    else if(event->type() == QEvent::Leave)
    {
    // SET OPACITY BACK TO NORMAL
    }

    N Offline
    N Offline
    nanor
    wrote on last edited by nanor
    #5

    @Pl45m4 Thank you so much for your complete reply. I set your code into my project, but I got some errors . Here is my updated code:

    dialog.h:

    #ifndef DIALOG_H
    #define DIALOG_H
    
    #include <QDialog>
    #include <QToolButton>
    #include <QGraphicsOpacityEffect>
    
    namespace Ui {
    class Dialog;
    }
    
    class Dialog : public QDialog
    {
        Q_OBJECT
    
    public:
        explicit Dialog(QWidget *parent = 0);
        ~Dialog();
        QToolButton *butt;
        QGraphicsOpacityEffect *effect;
    
    
    private:
        Ui::Dialog *ui;
    
    protected:
        void enterEvent(QEvent * event);
        bool eventFilter(QObject *obj, QEvent *event) override;
    
    
    
    };
    
    bool Dialog::eventFilter(QObject *obj, QEvent *event)
    {
        if(obj == butt)
        {
            if(event->type() == QEvent::Enter)
            {
                // SET YOUR OPACITY
                effect->setOpacity(1);
                butt->setGraphicsEffect(effect);
            }
            else if(event->type() == QEvent::Leave)
            {
               // SET OPACITY BACK TO NORMAL
                effect->setOpacity(0.5);
                butt->setGraphicsEffect(effect);
    
            }
            return true;
        }
        else
        {
            return QDialog::eventFilter(obj, event);
        }
    }
    
    #endif // DIALOG_H
    
    
    

    dialog.cpp:

    
        QImage image;
        image.load("F:/qt codes/opacity4/2-2");
    
        image = image.convertToFormat(QImage::Format_ARGB32);
    
        QPainter painter(&image);
        painter.setOpacity(0.5);
    
        QPixmap pixmap = QPixmap::fromImage(image);
        QIcon icon(pixmap);
        butt->setIcon(icon);
        butt->setIconSize(QSize(widthW/2,heightW/3.3));
        butt->setText("my book");
        butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
        butt->setCursor(Qt::PointingHandCursor);
    
    
        effect = new QGraphicsOpacityEffect(this);
        effect->setOpacity(0.5);
        butt->setGraphicsEffect(effect);
    
        //butt->setAttribute(Qt::WA_Hover, true);
        butt->setMouseTracking(true);
        butt->installEventFilter(this);
    
    }
    
    Dialog::~Dialog()
    {
        delete ui;
    }
    
    
    void Dialog::enterEvent(QEvent * event)
    {
        QToolButton::enterEvent(event);
        effect->setOpacity(1);
        butt->setGraphicsEffect(effect);
    
    }
    
    

    Have I written the part re-implementation (bool Dialog::eventFilter(QObject *obj, QEvent *event)) in the correct place?

    The errors I get:

    iiiiii.png

    Pl45m4P 1 Reply Last reply
    0
    • N nanor

      @Pl45m4 Thank you so much for your complete reply. I set your code into my project, but I got some errors . Here is my updated code:

      dialog.h:

      #ifndef DIALOG_H
      #define DIALOG_H
      
      #include <QDialog>
      #include <QToolButton>
      #include <QGraphicsOpacityEffect>
      
      namespace Ui {
      class Dialog;
      }
      
      class Dialog : public QDialog
      {
          Q_OBJECT
      
      public:
          explicit Dialog(QWidget *parent = 0);
          ~Dialog();
          QToolButton *butt;
          QGraphicsOpacityEffect *effect;
      
      
      private:
          Ui::Dialog *ui;
      
      protected:
          void enterEvent(QEvent * event);
          bool eventFilter(QObject *obj, QEvent *event) override;
      
      
      
      };
      
      bool Dialog::eventFilter(QObject *obj, QEvent *event)
      {
          if(obj == butt)
          {
              if(event->type() == QEvent::Enter)
              {
                  // SET YOUR OPACITY
                  effect->setOpacity(1);
                  butt->setGraphicsEffect(effect);
              }
              else if(event->type() == QEvent::Leave)
              {
                 // SET OPACITY BACK TO NORMAL
                  effect->setOpacity(0.5);
                  butt->setGraphicsEffect(effect);
      
              }
              return true;
          }
          else
          {
              return QDialog::eventFilter(obj, event);
          }
      }
      
      #endif // DIALOG_H
      
      
      

      dialog.cpp:

      
          QImage image;
          image.load("F:/qt codes/opacity4/2-2");
      
          image = image.convertToFormat(QImage::Format_ARGB32);
      
          QPainter painter(&image);
          painter.setOpacity(0.5);
      
          QPixmap pixmap = QPixmap::fromImage(image);
          QIcon icon(pixmap);
          butt->setIcon(icon);
          butt->setIconSize(QSize(widthW/2,heightW/3.3));
          butt->setText("my book");
          butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
          butt->setCursor(Qt::PointingHandCursor);
      
      
          effect = new QGraphicsOpacityEffect(this);
          effect->setOpacity(0.5);
          butt->setGraphicsEffect(effect);
      
          //butt->setAttribute(Qt::WA_Hover, true);
          butt->setMouseTracking(true);
          butt->installEventFilter(this);
      
      }
      
      Dialog::~Dialog()
      {
          delete ui;
      }
      
      
      void Dialog::enterEvent(QEvent * event)
      {
          QToolButton::enterEvent(event);
          effect->setOpacity(1);
          butt->setGraphicsEffect(effect);
      
      }
      
      

      Have I written the part re-implementation (bool Dialog::eventFilter(QObject *obj, QEvent *event)) in the correct place?

      The errors I get:

      iiiiii.png

      Pl45m4P Offline
      Pl45m4P Offline
      Pl45m4
      wrote on last edited by Pl45m4
      #6

      @nanor said in How to change the QToolButton opacity when the cursor is on int?:

      Have I written the part re-implementation (bool Dialog::eventFilter(QObject *obj, QEvent *event)) in the correct place?

      This belongs in your dialog.cpp. If this does not help, also #include <QEvent> .

      ... and remove or comment your Dialog::EnterEvent. It will always fire, when you move your mouse over your dialog.

      BTW: butt is a hilarious name for a button :D


      If debugging is the process of removing software bugs, then programming must be the process of putting them in.

      ~E. W. Dijkstra

      N 1 Reply Last reply
      1
      • Pl45m4P Pl45m4

        @nanor said in How to change the QToolButton opacity when the cursor is on int?:

        Have I written the part re-implementation (bool Dialog::eventFilter(QObject *obj, QEvent *event)) in the correct place?

        This belongs in your dialog.cpp. If this does not help, also #include <QEvent> .

        ... and remove or comment your Dialog::EnterEvent. It will always fire, when you move your mouse over your dialog.

        BTW: butt is a hilarious name for a button :D

        N Offline
        N Offline
        nanor
        wrote on last edited by
        #7

        @Pl45m4 I added #include<QEvent> to both dialog.h and dialog.cpp files and commented the part:

        void Dialog::enterEvent(QEvent * event)
        {
        
            QToolButton::enterEvent(event);
            effect->setOpacity(1);
            butt->setGraphicsEffect(effect);
        
        }
        

        but I got error.

        Here is my updated code:

        dialog.h:

        #ifndef DIALOG_H
        #define DIALOG_H
        
        #include <QDialog>
        #include <QToolButton>
        #include <QGraphicsOpacityEffect>
        #include <QEvent>
        
        namespace Ui {
        class Dialog;
        }
        
        class Dialog : public QDialog
        {
            Q_OBJECT
        
        public:
            explicit Dialog(QWidget *parent = 0);
            ~Dialog();
            QToolButton *butt;
            QGraphicsOpacityEffect *effect;
        
        
        private:
            Ui::Dialog *ui;
        
        protected:
            void enterEvent(QEvent * event);
            bool eventFilter(QObject *obj, QEvent *event) override;
        
        
        };
        
        
        bool Dialog::eventFilter(QObject *obj, QEvent *event)
            {
                if(obj == butt)
                {
                    if(event->type() == QEvent::Enter)
                    {
                        // SET YOUR OPACITY
                        effect->setOpacity(1);
                        butt->setGraphicsEffect(effect);
                    }
                    else if(event->type() == QEvent::Leave)
                    {
                       // SET OPACITY BACK TO NORMAL
                        effect->setOpacity(0.5);
                        butt->setGraphicsEffect(effect);
        
                    }
                    return true;
                }
                else
                {
                    return QDialog::eventFilter(obj, event);
                }
            }
        
        #endif // DIALOG_H
        
        

        dialog.cpp:

        QImage image;
            image.load("F:/qt codes/opacity4/2-2");
        
            image = image.convertToFormat(QImage::Format_ARGB32);
        
            QPainter painter(&image);
            painter.setOpacity(0.5);
        
            QPixmap pixmap = QPixmap::fromImage(image);
            QIcon icon(pixmap);
            butt->setIcon(icon);
            butt->setIconSize(QSize(widthW/2,heightW/3.3));
            butt->setText("my book");
            butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
            butt->setCursor(Qt::PointingHandCursor);
        
        
            effect = new QGraphicsOpacityEffect(this);
            effect->setOpacity(0.5);
            butt->setGraphicsEffect(effect);
        
            //butt->setAttribute(Qt::WA_Hover, true);
            butt->setMouseTracking(true);
            butt->installEventFilter(this);
        
        
        
        
        
        
        }
        
        Dialog::~Dialog()
        {
            delete ui;
        }
        
        
        /*void Dialog::enterEvent(QEvent * event)
        {
        
            QToolButton::enterEvent(event);
            effect->setOpacity(1);
            butt->setGraphicsEffect(effect);
        
        }*/
        
        
        

        The error I got:
        dddd.png

        Pl45m4P 1 Reply Last reply
        0
        • N nanor

          @Pl45m4 I added #include<QEvent> to both dialog.h and dialog.cpp files and commented the part:

          void Dialog::enterEvent(QEvent * event)
          {
          
              QToolButton::enterEvent(event);
              effect->setOpacity(1);
              butt->setGraphicsEffect(effect);
          
          }
          

          but I got error.

          Here is my updated code:

          dialog.h:

          #ifndef DIALOG_H
          #define DIALOG_H
          
          #include <QDialog>
          #include <QToolButton>
          #include <QGraphicsOpacityEffect>
          #include <QEvent>
          
          namespace Ui {
          class Dialog;
          }
          
          class Dialog : public QDialog
          {
              Q_OBJECT
          
          public:
              explicit Dialog(QWidget *parent = 0);
              ~Dialog();
              QToolButton *butt;
              QGraphicsOpacityEffect *effect;
          
          
          private:
              Ui::Dialog *ui;
          
          protected:
              void enterEvent(QEvent * event);
              bool eventFilter(QObject *obj, QEvent *event) override;
          
          
          };
          
          
          bool Dialog::eventFilter(QObject *obj, QEvent *event)
              {
                  if(obj == butt)
                  {
                      if(event->type() == QEvent::Enter)
                      {
                          // SET YOUR OPACITY
                          effect->setOpacity(1);
                          butt->setGraphicsEffect(effect);
                      }
                      else if(event->type() == QEvent::Leave)
                      {
                         // SET OPACITY BACK TO NORMAL
                          effect->setOpacity(0.5);
                          butt->setGraphicsEffect(effect);
          
                      }
                      return true;
                  }
                  else
                  {
                      return QDialog::eventFilter(obj, event);
                  }
              }
          
          #endif // DIALOG_H
          
          

          dialog.cpp:

          QImage image;
              image.load("F:/qt codes/opacity4/2-2");
          
              image = image.convertToFormat(QImage::Format_ARGB32);
          
              QPainter painter(&image);
              painter.setOpacity(0.5);
          
              QPixmap pixmap = QPixmap::fromImage(image);
              QIcon icon(pixmap);
              butt->setIcon(icon);
              butt->setIconSize(QSize(widthW/2,heightW/3.3));
              butt->setText("my book");
              butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
              butt->setCursor(Qt::PointingHandCursor);
          
          
              effect = new QGraphicsOpacityEffect(this);
              effect->setOpacity(0.5);
              butt->setGraphicsEffect(effect);
          
              //butt->setAttribute(Qt::WA_Hover, true);
              butt->setMouseTracking(true);
              butt->installEventFilter(this);
          
          
          
          
          
          
          }
          
          Dialog::~Dialog()
          {
              delete ui;
          }
          
          
          /*void Dialog::enterEvent(QEvent * event)
          {
          
              QToolButton::enterEvent(event);
              effect->setOpacity(1);
              butt->setGraphicsEffect(effect);
          
          }*/
          
          
          

          The error I got:
          dddd.png

          Pl45m4P Offline
          Pl45m4P Offline
          Pl45m4
          wrote on last edited by Pl45m4
          #8

          @nanor

          Not in both. Only in your header is enough. Your cpp already includes your header file.

          And you didn't move the implemention from your header to your code file.

          Only this

          bool eventFilter(QObject *obj, QEvent *event) override;
          

          should stay in your header.

          What to put where, is general OOP / C++ knowledge ;-)


          If debugging is the process of removing software bugs, then programming must be the process of putting them in.

          ~E. W. Dijkstra

          N 1 Reply Last reply
          1
          • Pl45m4P Pl45m4

            @nanor

            Not in both. Only in your header is enough. Your cpp already includes your header file.

            And you didn't move the implemention from your header to your code file.

            Only this

            bool eventFilter(QObject *obj, QEvent *event) override;
            

            should stay in your header.

            What to put where, is general OOP / C++ knowledge ;-)

            N Offline
            N Offline
            nanor
            wrote on last edited by
            #9

            @Pl45m4 I'm really sorry , if I understood correctly, I have to remove the line void enterEvent(QEvent * event); from my header file?

            Pl45m4P 1 Reply Last reply
            0
            • N nanor

              @Pl45m4 I'm really sorry , if I understood correctly, I have to remove the line void enterEvent(QEvent * event); from my header file?

              Pl45m4P Offline
              Pl45m4P Offline
              Pl45m4
              wrote on last edited by Pl45m4
              #10

              @nanor said in How to change the QToolButton opacity when the cursor is on int?:

              remove the line void enterEvent(QEvent * event);

              Or comment it to test if my code works for you. You dont need a QDialog::EnterEvent. AND move the eventFilter implementation to your cpp. The errors should be gone now.


              If debugging is the process of removing software bugs, then programming must be the process of putting them in.

              ~E. W. Dijkstra

              N 1 Reply Last reply
              0
              • Pl45m4P Pl45m4

                @nanor said in How to change the QToolButton opacity when the cursor is on int?:

                remove the line void enterEvent(QEvent * event);

                Or comment it to test if my code works for you. You dont need a QDialog::EnterEvent. AND move the eventFilter implementation to your cpp. The errors should be gone now.

                N Offline
                N Offline
                nanor
                wrote on last edited by nanor
                #11

                @Pl45m4 I commented the line void enterEvent(QEvent * event); in the header file and added bool eventFilter(QObject *obj, QEvent *event) override; to the cpp file, after ui->setupUi(this);
                in the constructor, but I get this errer:

                sssss.png

                Pl45m4P 1 Reply Last reply
                0
                • N nanor

                  @Pl45m4 I commented the line void enterEvent(QEvent * event); in the header file and added bool eventFilter(QObject *obj, QEvent *event) override; to the cpp file, after ui->setupUi(this);
                  in the constructor, but I get this errer:

                  sssss.png

                  Pl45m4P Offline
                  Pl45m4P Offline
                  Pl45m4
                  wrote on last edited by
                  #12

                  @nanor

                  AHHHHHH.

                  No :)

                  This (bool eventFilter(QObject *obj, QEvent *event) override;) is not the implementation.

                  HEADER (Dialog.h)

                  protected:
                     bool eventFilter(QObject *obj, QEvent *event) override;
                  

                  DIALOG.CPP

                  bool Dialog::eventFilter(QObject *obj, QEvent *event)
                  {
                      if(obj == YOUR_BUTTON)
                      {
                          if(event->type() == QEvent::Enter)
                          {
                              // SET YOUR OPACITY
                          }
                          else if(event->type() == QEvent::Leave)
                          {
                             // SET OPACITY BACK TO NORMAL
                          }
                          return true;
                      }
                      else
                      {
                          return QDialog::eventFilter(obj, event);
                      }
                  

                  If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                  ~E. W. Dijkstra

                  N 1 Reply Last reply
                  1
                  • Pl45m4P Pl45m4

                    @nanor

                    AHHHHHH.

                    No :)

                    This (bool eventFilter(QObject *obj, QEvent *event) override;) is not the implementation.

                    HEADER (Dialog.h)

                    protected:
                       bool eventFilter(QObject *obj, QEvent *event) override;
                    

                    DIALOG.CPP

                    bool Dialog::eventFilter(QObject *obj, QEvent *event)
                    {
                        if(obj == YOUR_BUTTON)
                        {
                            if(event->type() == QEvent::Enter)
                            {
                                // SET YOUR OPACITY
                            }
                            else if(event->type() == QEvent::Leave)
                            {
                               // SET OPACITY BACK TO NORMAL
                            }
                            return true;
                        }
                        else
                        {
                            return QDialog::eventFilter(obj, event);
                        }
                    
                    N Offline
                    N Offline
                    nanor
                    wrote on last edited by
                    #13

                    @Pl45m4 Really sorry :( I set that part to my cpp file :

                    QImage image;
                        image.load("F:/qt codes/opacity4/2-2");
                    
                        image = image.convertToFormat(QImage::Format_ARGB32);
                    
                        QPainter painter(&image);
                        painter.setOpacity(0.5);
                    
                        QPixmap pixmap = QPixmap::fromImage(image);
                        QIcon icon(pixmap);
                        butt->setIcon(icon);
                        butt->setIconSize(QSize(widthW/2,heightW/3.3));
                        butt->setText("my book");
                        butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                        butt->setCursor(Qt::PointingHandCursor);
                    
                    
                        effect = new QGraphicsOpacityEffect(this);
                        effect->setOpacity(0.5);
                        butt->setGraphicsEffect(effect);
                    
                        //butt->setAttribute(Qt::WA_Hover, true);
                        butt->setMouseTracking(true);
                        butt->installEventFilter(this);
                    
                    
                    
                    }
                    
                    Dialog::~Dialog()
                    {
                        delete ui;
                    }
                    
                    
                    bool Dialog::eventFilter(QObject *obj, QEvent *event)
                        {
                            if(obj == butt)
                            {
                                if(event->type() == QEvent::Enter)
                                {
                                    // SET YOUR OPACITY
                                    effect->setOpacity(1);
                                    butt->setGraphicsEffect(effect);
                                }
                                else if(event->type() == QEvent::Leave)
                                {
                                   // SET OPACITY BACK TO NORMAL
                                    effect->setOpacity(0.5);
                                    butt->setGraphicsEffect(effect);
                    
                                }
                                return true;
                            }
                            else
                            {
                                return QDialog::eventFilter(obj, event);
                            }
                        }
                    
                    
                    
                    /*void Dialog::enterEvent(QEvent * event)
                    {
                    
                        QToolButton::enterEvent(event);
                        effect->setOpacity(1);
                        butt->setGraphicsEffect(effect);
                    
                    }*/
                    

                    But got this error:

                    aaaa.png

                    Pl45m4P 1 Reply Last reply
                    0
                    • N nanor

                      @Pl45m4 Really sorry :( I set that part to my cpp file :

                      QImage image;
                          image.load("F:/qt codes/opacity4/2-2");
                      
                          image = image.convertToFormat(QImage::Format_ARGB32);
                      
                          QPainter painter(&image);
                          painter.setOpacity(0.5);
                      
                          QPixmap pixmap = QPixmap::fromImage(image);
                          QIcon icon(pixmap);
                          butt->setIcon(icon);
                          butt->setIconSize(QSize(widthW/2,heightW/3.3));
                          butt->setText("my book");
                          butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                          butt->setCursor(Qt::PointingHandCursor);
                      
                      
                          effect = new QGraphicsOpacityEffect(this);
                          effect->setOpacity(0.5);
                          butt->setGraphicsEffect(effect);
                      
                          //butt->setAttribute(Qt::WA_Hover, true);
                          butt->setMouseTracking(true);
                          butt->installEventFilter(this);
                      
                      
                      
                      }
                      
                      Dialog::~Dialog()
                      {
                          delete ui;
                      }
                      
                      
                      bool Dialog::eventFilter(QObject *obj, QEvent *event)
                          {
                              if(obj == butt)
                              {
                                  if(event->type() == QEvent::Enter)
                                  {
                                      // SET YOUR OPACITY
                                      effect->setOpacity(1);
                                      butt->setGraphicsEffect(effect);
                                  }
                                  else if(event->type() == QEvent::Leave)
                                  {
                                     // SET OPACITY BACK TO NORMAL
                                      effect->setOpacity(0.5);
                                      butt->setGraphicsEffect(effect);
                      
                                  }
                                  return true;
                              }
                              else
                              {
                                  return QDialog::eventFilter(obj, event);
                              }
                          }
                      
                      
                      
                      /*void Dialog::enterEvent(QEvent * event)
                      {
                      
                          QToolButton::enterEvent(event);
                          effect->setOpacity(1);
                          butt->setGraphicsEffect(effect);
                      
                      }*/
                      

                      But got this error:

                      aaaa.png

                      Pl45m4P Offline
                      Pl45m4P Offline
                      Pl45m4
                      wrote on last edited by Pl45m4
                      #14

                      @nanor

                      I assume you still have the Dialog::eventFilter implementation in your header file?!
                      (Because it says, that you are re-defining it in your cpp).

                      If not, try a "Clean" followed by "Build" or "Rebuild" and "Run QMake".


                      If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                      ~E. W. Dijkstra

                      N 1 Reply Last reply
                      0
                      • Pl45m4P Pl45m4

                        @nanor

                        I assume you still have the Dialog::eventFilter implementation in your header file?!
                        (Because it says, that you are re-defining it in your cpp).

                        If not, try a "Clean" followed by "Build" or "Rebuild" and "Run QMake".

                        N Offline
                        N Offline
                        nanor
                        wrote on last edited by
                        #15

                        @Pl45m4 Oh sorry. I have thought you mean the protected part of the header file.
                        My header file now is:

                        #ifndef DIALOG_H
                        #define DIALOG_H
                        
                        #include <QDialog>
                        #include <QToolButton>
                        #include <QGraphicsOpacityEffect>
                        #include <QEvent>
                        
                        namespace Ui {
                        class Dialog;
                        }
                        
                        class Dialog : public QDialog
                        {
                            Q_OBJECT
                        
                        public:
                            explicit Dialog(QWidget *parent = 0);
                            ~Dialog();
                            QToolButton *butt;
                            QGraphicsOpacityEffect *effect;
                        
                        
                        private:
                            Ui::Dialog *ui;
                        
                        protected:
                            bool eventFilter(QObject *obj, QEvent *event) override;
                        
                        
                        };
                        
                        
                        
                        #endif // DIALOG_H
                        
                        

                        and my cpp file is:

                        #include "dialog.h"
                        #include "ui_dialog.h"
                        #include <QDesktopWidget>
                        #include <QIcon>
                        #include <QPixmap>
                        #include <QToolButton>
                        #include <QImage>
                        #include <QPainter>
                        #include <QGraphicsOpacityEffect>
                        #include <QDebug>
                        
                        
                        Dialog::Dialog(QWidget *parent) :
                            QDialog(parent),
                            ui(new Ui::Dialog)
                        {
                            ui->setupUi(this);
                        
                        
                        
                        
                            QDesktopWidget wid;
                            int screenWidth = wid.screen()->width();
                            int screenHeight = wid.screen()->height();
                        
                            this->setFixedSize(screenWidth/2.5,screenHeight/1.5);
                        
                            int widthW = this->frameGeometry().width();
                            int heightW = this->frameGeometry().height();
                            //qDebug() << widthW;
                            //qDebug() << heightW;
                            this->setGeometry((screenWidth/2)-(widthW/2),(screenHeight/2)-(heightW/2),widthW,heightW);
                        
                            butt= new QToolButton(this);
                            butt->setFixedSize(widthW/2.5,heightW/2.5);
                            int width_button_EM = butt->frameGeometry().width();
                            int height_buttin_EM = butt->frameGeometry().height();
                            butt->setGeometry(widthW*50/100,heightW*20/100,width_button_EM,height_buttin_EM);
                        
                        
                        
                            butt->setObjectName("butt-name");
                            butt->setStyleSheet(
                        
                            "QToolButton#butt-name {"
                                "border:5px solid #303030;"
                                "border-width: 3px;"
                                " }"
                            " QToolButton#butt-name {"
                                "  border-radius: 0px;"
                                " }"
                        
                            "QToolButton#butt-name {"
                                "padding-left:5px; padding-right:5px; padding-bottom:5px;  padding-top:5px;"
                               "}"
                                );
                        
                        
                        
                        
                            QImage image;
                            image.load("F:/qt codes/opacity4/2-2");
                        
                            image = image.convertToFormat(QImage::Format_ARGB32);
                        
                            QPainter painter(&image);
                            painter.setOpacity(0.5);
                        
                            QPixmap pixmap = QPixmap::fromImage(image);
                            QIcon icon(pixmap);
                            butt->setIcon(icon);
                            butt->setIconSize(QSize(widthW/2,heightW/3.3));
                            butt->setText("my book");
                            butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                            butt->setCursor(Qt::PointingHandCursor);
                        
                        
                            effect = new QGraphicsOpacityEffect(this);
                           // effect->setOpacity(0.5);
                            //butt->setGraphicsEffect(effect);
                        
                            //butt->setAttribute(Qt::WA_Hover, true);
                            butt->setMouseTracking(true);
                            butt->installEventFilter(this);
                        
                        
                        
                        }
                        
                        Dialog::~Dialog()
                        {
                            delete ui;
                        }
                        
                        
                        bool Dialog::eventFilter(QObject *obj, QEvent *event)
                            {
                                if(obj == butt)
                                {
                                    if(event->type() == QEvent::Enter)
                                    {
                                        // SET YOUR OPACITY
                                        effect->setOpacity(1);
                                        butt->setGraphicsEffect(effect);
                                    }
                                    else if(event->type() == QEvent::Leave)
                                    {
                                       // SET OPACITY BACK TO NORMAL
                                        effect->setOpacity(0.5);
                                        butt->setGraphicsEffect(effect);
                        
                                    }
                                    return true;
                                }
                                else
                                {
                                    return QDialog::eventFilter(obj, event);
                                }
                            }
                        
                        
                        

                        But the output is only an empty dialog window without button and button icon.

                        emty.png

                        Pl45m4P 1 Reply Last reply
                        0
                        • N nanor

                          @Pl45m4 Oh sorry. I have thought you mean the protected part of the header file.
                          My header file now is:

                          #ifndef DIALOG_H
                          #define DIALOG_H
                          
                          #include <QDialog>
                          #include <QToolButton>
                          #include <QGraphicsOpacityEffect>
                          #include <QEvent>
                          
                          namespace Ui {
                          class Dialog;
                          }
                          
                          class Dialog : public QDialog
                          {
                              Q_OBJECT
                          
                          public:
                              explicit Dialog(QWidget *parent = 0);
                              ~Dialog();
                              QToolButton *butt;
                              QGraphicsOpacityEffect *effect;
                          
                          
                          private:
                              Ui::Dialog *ui;
                          
                          protected:
                              bool eventFilter(QObject *obj, QEvent *event) override;
                          
                          
                          };
                          
                          
                          
                          #endif // DIALOG_H
                          
                          

                          and my cpp file is:

                          #include "dialog.h"
                          #include "ui_dialog.h"
                          #include <QDesktopWidget>
                          #include <QIcon>
                          #include <QPixmap>
                          #include <QToolButton>
                          #include <QImage>
                          #include <QPainter>
                          #include <QGraphicsOpacityEffect>
                          #include <QDebug>
                          
                          
                          Dialog::Dialog(QWidget *parent) :
                              QDialog(parent),
                              ui(new Ui::Dialog)
                          {
                              ui->setupUi(this);
                          
                          
                          
                          
                              QDesktopWidget wid;
                              int screenWidth = wid.screen()->width();
                              int screenHeight = wid.screen()->height();
                          
                              this->setFixedSize(screenWidth/2.5,screenHeight/1.5);
                          
                              int widthW = this->frameGeometry().width();
                              int heightW = this->frameGeometry().height();
                              //qDebug() << widthW;
                              //qDebug() << heightW;
                              this->setGeometry((screenWidth/2)-(widthW/2),(screenHeight/2)-(heightW/2),widthW,heightW);
                          
                              butt= new QToolButton(this);
                              butt->setFixedSize(widthW/2.5,heightW/2.5);
                              int width_button_EM = butt->frameGeometry().width();
                              int height_buttin_EM = butt->frameGeometry().height();
                              butt->setGeometry(widthW*50/100,heightW*20/100,width_button_EM,height_buttin_EM);
                          
                          
                          
                              butt->setObjectName("butt-name");
                              butt->setStyleSheet(
                          
                              "QToolButton#butt-name {"
                                  "border:5px solid #303030;"
                                  "border-width: 3px;"
                                  " }"
                              " QToolButton#butt-name {"
                                  "  border-radius: 0px;"
                                  " }"
                          
                              "QToolButton#butt-name {"
                                  "padding-left:5px; padding-right:5px; padding-bottom:5px;  padding-top:5px;"
                                 "}"
                                  );
                          
                          
                          
                          
                              QImage image;
                              image.load("F:/qt codes/opacity4/2-2");
                          
                              image = image.convertToFormat(QImage::Format_ARGB32);
                          
                              QPainter painter(&image);
                              painter.setOpacity(0.5);
                          
                              QPixmap pixmap = QPixmap::fromImage(image);
                              QIcon icon(pixmap);
                              butt->setIcon(icon);
                              butt->setIconSize(QSize(widthW/2,heightW/3.3));
                              butt->setText("my book");
                              butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                              butt->setCursor(Qt::PointingHandCursor);
                          
                          
                              effect = new QGraphicsOpacityEffect(this);
                             // effect->setOpacity(0.5);
                              //butt->setGraphicsEffect(effect);
                          
                              //butt->setAttribute(Qt::WA_Hover, true);
                              butt->setMouseTracking(true);
                              butt->installEventFilter(this);
                          
                          
                          
                          }
                          
                          Dialog::~Dialog()
                          {
                              delete ui;
                          }
                          
                          
                          bool Dialog::eventFilter(QObject *obj, QEvent *event)
                              {
                                  if(obj == butt)
                                  {
                                      if(event->type() == QEvent::Enter)
                                      {
                                          // SET YOUR OPACITY
                                          effect->setOpacity(1);
                                          butt->setGraphicsEffect(effect);
                                      }
                                      else if(event->type() == QEvent::Leave)
                                      {
                                         // SET OPACITY BACK TO NORMAL
                                          effect->setOpacity(0.5);
                                          butt->setGraphicsEffect(effect);
                          
                                      }
                                      return true;
                                  }
                                  else
                                  {
                                      return QDialog::eventFilter(obj, event);
                                  }
                              }
                          
                          
                          

                          But the output is only an empty dialog window without button and button icon.

                          emty.png

                          Pl45m4P Offline
                          Pl45m4P Offline
                          Pl45m4
                          wrote on last edited by
                          #16

                          @nanor

                          How is your button set to your dialog and where?

                          QDesktopWidget is deprecated and shouldn't be used anymore. All in all, you picked the wrong approach. Better apply some QLayout (horizontal or vertical) to your QDialog and then add your button.


                          If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                          ~E. W. Dijkstra

                          N 1 Reply Last reply
                          0
                          • Pl45m4P Pl45m4

                            @nanor

                            How is your button set to your dialog and where?

                            QDesktopWidget is deprecated and shouldn't be used anymore. All in all, you picked the wrong approach. Better apply some QLayout (horizontal or vertical) to your QDialog and then add your button.

                            N Offline
                            N Offline
                            nanor
                            wrote on last edited by
                            #17

                            @Pl45m4 Actually I have used QDesktopWidget, because I want to set the geometry based on my screen width and height.

                            When I comment the part:

                            bool Dialog::eventFilter(QObject *obj, QEvent *event)
                                {
                                    if(obj == butt)
                                    {
                                        if(event->type() == QEvent::Enter)
                                        {
                            
                                            effect->setOpacity(1);
                                            butt->setGraphicsEffect(effect);
                                        }
                                        else if(event->type() == QEvent::Leave)
                                        {
                            
                                            effect->setOpacity(0.5);
                                            butt->setGraphicsEffect(effect);
                            
                                        }
                                        return true;
                                    }
                                    else
                                    {
                                        return QDialog::eventFilter(obj, event);
                                    }
                                }
                            

                            from my cpp file , and the part:

                            protected:
                                bool eventFilter(QObject *obj, QEvent *event) override;
                            

                            from my header file, I got the following output:

                            asd.png

                            And when I don't comment those parts, I got an empty dialog window.

                            Pl45m4P 1 Reply Last reply
                            0
                            • N nanor

                              @Pl45m4 Actually I have used QDesktopWidget, because I want to set the geometry based on my screen width and height.

                              When I comment the part:

                              bool Dialog::eventFilter(QObject *obj, QEvent *event)
                                  {
                                      if(obj == butt)
                                      {
                                          if(event->type() == QEvent::Enter)
                                          {
                              
                                              effect->setOpacity(1);
                                              butt->setGraphicsEffect(effect);
                                          }
                                          else if(event->type() == QEvent::Leave)
                                          {
                              
                                              effect->setOpacity(0.5);
                                              butt->setGraphicsEffect(effect);
                              
                                          }
                                          return true;
                                      }
                                      else
                                      {
                                          return QDialog::eventFilter(obj, event);
                                      }
                                  }
                              

                              from my cpp file , and the part:

                              protected:
                                  bool eventFilter(QObject *obj, QEvent *event) override;
                              

                              from my header file, I got the following output:

                              asd.png

                              And when I don't comment those parts, I got an empty dialog window.

                              Pl45m4P Offline
                              Pl45m4P Offline
                              Pl45m4
                              wrote on last edited by
                              #18

                              @nanor said in How to change the QToolButton opacity when the cursor is on int?:

                              I want to set the geometry based on my screen width and height

                              QScreen is the alternative / replacement.
                              https://doc.qt.io/qt-5/qscreen.html

                              Your button is floating around / just drawn on your widget (dialog).

                              It is always better to use layouts unless there is any reason to not, which I dont see in your case :)

                              dialog.cpp (after butt->setCursor(Qt::PointingHandCursor);)

                              QVBoxLayout *layout = new QVBoxLayout;
                              layout->addWidget(butt);
                              setLayout(layout);
                              

                              If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                              ~E. W. Dijkstra

                              N 1 Reply Last reply
                              0
                              • Pl45m4P Pl45m4

                                @nanor said in How to change the QToolButton opacity when the cursor is on int?:

                                I want to set the geometry based on my screen width and height

                                QScreen is the alternative / replacement.
                                https://doc.qt.io/qt-5/qscreen.html

                                Your button is floating around / just drawn on your widget (dialog).

                                It is always better to use layouts unless there is any reason to not, which I dont see in your case :)

                                dialog.cpp (after butt->setCursor(Qt::PointingHandCursor);)

                                QVBoxLayout *layout = new QVBoxLayout;
                                layout->addWidget(butt);
                                setLayout(layout);
                                
                                N Offline
                                N Offline
                                nanor
                                wrote on last edited by
                                #19

                                @Pl45m4 I added the layout and now my cpp file is:

                                #include "dialog.h"
                                #include "ui_dialog.h"
                                #include <QDesktopWidget>
                                #include <QIcon>
                                #include <QPixmap>
                                #include <QToolButton>
                                #include <QImage>
                                #include <QPainter>
                                #include <QGraphicsOpacityEffect>
                                #include <QDebug>
                                #include <QVBoxLayout>
                                
                                Dialog::Dialog(QWidget *parent) :
                                    QDialog(parent),
                                    ui(new Ui::Dialog)
                                {
                                    ui->setupUi(this);
                                
                                
                                
                                
                                    /*QDesktopWidget wid;
                                    int screenWidth = wid.screen()->width();
                                    int screenHeight = wid.screen()->height();
                                
                                    this->setFixedSize(screenWidth/2.5,screenHeight/1.5);
                                
                                    int widthW = this->frameGeometry().width();
                                    int heightW = this->frameGeometry().height();
                                    qDebug() << widthW;
                                    qDebug() << heightW;
                                    this->setGeometry((screenWidth/2)-(widthW/2),(screenHeight/2)-(heightW/2),widthW,heightW);
                                
                                    
                                    butt->setFixedSize(widthW/2.5,heightW/2.5);
                                    int width_button_EM = butt->frameGeometry().width();
                                    int height_buttin_EM = butt->frameGeometry().height();
                                    butt->setGeometry(widthW*50/100,heightW*20/100,width_button_EM,height_buttin_EM);*/
                                
                                
                                    butt= new QToolButton(this);
                                    butt->setObjectName("butt-name");
                                    butt->setStyleSheet(
                                
                                    "QToolButton#butt-name {"
                                        "border:5px solid #303030;"
                                        "border-width: 3px;"
                                        " }"
                                    " QToolButton#butt-name {"
                                        "  border-radius: 0px;"
                                        " }"
                                
                                    "QToolButton#butt-name {"
                                        "padding-left:5px; padding-right:5px; padding-bottom:5px;  padding-top:5px;"
                                       "}"
                                        );
                                
                                
                                
                                
                                    QImage image;
                                    image.load("F:/qt codes/opacity4/2-2");
                                
                                    image = image.convertToFormat(QImage::Format_ARGB32);
                                
                                    QPainter painter(&image);
                                    painter.setOpacity(0.5);
                                
                                    QPixmap pixmap = QPixmap::fromImage(image);
                                    QIcon icon(pixmap);
                                    butt->setIcon(icon);
                                   // butt->setIconSize(QSize(widthW/2,heightW/3.3));
                                    butt->setIconSize(QSize(100,200));
                                    butt->setText("my book");
                                    butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                                    butt->setCursor(Qt::PointingHandCursor);
                                
                                
                                    effect = new QGraphicsOpacityEffect(this);
                                    effect->setOpacity(0.5);
                                    butt->setGraphicsEffect(effect);
                                
                                    //butt->setAttribute(Qt::WA_Hover, true);
                                    butt->setMouseTracking(true);
                                    butt->installEventFilter(this);
                                
                                    QVBoxLayout *layout = new QVBoxLayout;
                                    layout->addWidget(butt);
                                    setLayout(layout);
                                
                                
                                
                                }
                                
                                Dialog::~Dialog()
                                {
                                    delete ui;
                                }
                                
                                
                                bool Dialog::eventFilter(QObject *obj, QEvent *event)
                                    {
                                        if(obj == butt)
                                        {
                                            if(event->type() == QEvent::Enter)
                                            {
                                
                                                effect->setOpacity(1);
                                                butt->setGraphicsEffect(effect);
                                            }
                                            else if(event->type() == QEvent::Leave)
                                            {
                                
                                                effect->setOpacity(0.5);
                                                butt->setGraphicsEffect(effect);
                                
                                            }
                                            return true;
                                        }
                                        else
                                        {
                                            return QDialog::eventFilter(obj, event);
                                        }
                                    }
                                
                                
                                

                                Again, when I don't comment the eventfilter parts, the output is an empty dialog window and when I comment those parts, I got:

                                vboxxx.png

                                The reason I use QDesktopWidget is that I want to have my program exe file and then use the program in different computers with different widths and heights, so I have to set geometry to my elements based on the screen geometry.

                                N 1 Reply Last reply
                                0
                                • N nanor

                                  @Pl45m4 I added the layout and now my cpp file is:

                                  #include "dialog.h"
                                  #include "ui_dialog.h"
                                  #include <QDesktopWidget>
                                  #include <QIcon>
                                  #include <QPixmap>
                                  #include <QToolButton>
                                  #include <QImage>
                                  #include <QPainter>
                                  #include <QGraphicsOpacityEffect>
                                  #include <QDebug>
                                  #include <QVBoxLayout>
                                  
                                  Dialog::Dialog(QWidget *parent) :
                                      QDialog(parent),
                                      ui(new Ui::Dialog)
                                  {
                                      ui->setupUi(this);
                                  
                                  
                                  
                                  
                                      /*QDesktopWidget wid;
                                      int screenWidth = wid.screen()->width();
                                      int screenHeight = wid.screen()->height();
                                  
                                      this->setFixedSize(screenWidth/2.5,screenHeight/1.5);
                                  
                                      int widthW = this->frameGeometry().width();
                                      int heightW = this->frameGeometry().height();
                                      qDebug() << widthW;
                                      qDebug() << heightW;
                                      this->setGeometry((screenWidth/2)-(widthW/2),(screenHeight/2)-(heightW/2),widthW,heightW);
                                  
                                      
                                      butt->setFixedSize(widthW/2.5,heightW/2.5);
                                      int width_button_EM = butt->frameGeometry().width();
                                      int height_buttin_EM = butt->frameGeometry().height();
                                      butt->setGeometry(widthW*50/100,heightW*20/100,width_button_EM,height_buttin_EM);*/
                                  
                                  
                                      butt= new QToolButton(this);
                                      butt->setObjectName("butt-name");
                                      butt->setStyleSheet(
                                  
                                      "QToolButton#butt-name {"
                                          "border:5px solid #303030;"
                                          "border-width: 3px;"
                                          " }"
                                      " QToolButton#butt-name {"
                                          "  border-radius: 0px;"
                                          " }"
                                  
                                      "QToolButton#butt-name {"
                                          "padding-left:5px; padding-right:5px; padding-bottom:5px;  padding-top:5px;"
                                         "}"
                                          );
                                  
                                  
                                  
                                  
                                      QImage image;
                                      image.load("F:/qt codes/opacity4/2-2");
                                  
                                      image = image.convertToFormat(QImage::Format_ARGB32);
                                  
                                      QPainter painter(&image);
                                      painter.setOpacity(0.5);
                                  
                                      QPixmap pixmap = QPixmap::fromImage(image);
                                      QIcon icon(pixmap);
                                      butt->setIcon(icon);
                                     // butt->setIconSize(QSize(widthW/2,heightW/3.3));
                                      butt->setIconSize(QSize(100,200));
                                      butt->setText("my book");
                                      butt->setToolButtonStyle(Qt::ToolButtonTextUnderIcon);
                                      butt->setCursor(Qt::PointingHandCursor);
                                  
                                  
                                      effect = new QGraphicsOpacityEffect(this);
                                      effect->setOpacity(0.5);
                                      butt->setGraphicsEffect(effect);
                                  
                                      //butt->setAttribute(Qt::WA_Hover, true);
                                      butt->setMouseTracking(true);
                                      butt->installEventFilter(this);
                                  
                                      QVBoxLayout *layout = new QVBoxLayout;
                                      layout->addWidget(butt);
                                      setLayout(layout);
                                  
                                  
                                  
                                  }
                                  
                                  Dialog::~Dialog()
                                  {
                                      delete ui;
                                  }
                                  
                                  
                                  bool Dialog::eventFilter(QObject *obj, QEvent *event)
                                      {
                                          if(obj == butt)
                                          {
                                              if(event->type() == QEvent::Enter)
                                              {
                                  
                                                  effect->setOpacity(1);
                                                  butt->setGraphicsEffect(effect);
                                              }
                                              else if(event->type() == QEvent::Leave)
                                              {
                                  
                                                  effect->setOpacity(0.5);
                                                  butt->setGraphicsEffect(effect);
                                  
                                              }
                                              return true;
                                          }
                                          else
                                          {
                                              return QDialog::eventFilter(obj, event);
                                          }
                                      }
                                  
                                  
                                  

                                  Again, when I don't comment the eventfilter parts, the output is an empty dialog window and when I comment those parts, I got:

                                  vboxxx.png

                                  The reason I use QDesktopWidget is that I want to have my program exe file and then use the program in different computers with different widths and heights, so I have to set geometry to my elements based on the screen geometry.

                                  N Offline
                                  N Offline
                                  nanor
                                  wrote on last edited by
                                  #20

                                  @Pl45m4 Hi. Finally I succeed! I changed the protected part of my header file to:

                                  protected:
                                  bool eventFilter(QObject *obj, QEvent *event){
                                           if(obj == butt)
                                            {
                                               if(event->type() == QEvent::Enter)
                                               {
                                                   effect->setOpacity(1);
                                                   butt->setGraphicsEffect(effect);
                                               }
                                               else if(event->type() == QEvent::Leave)
                                                {
                                                   effect->setOpacity(0.5);
                                                   butt->setGraphicsEffect(effect);
                                                }
                                       }
                                  
                                       }
                                  
                                  

                                  and clear the bool part from the cpp file and my code worked fine.
                                  Thank you so much for the code you provided yesterday. Really appreciate your help .
                                  Best regards.

                                  Pl45m4P 1 Reply Last reply
                                  0
                                  • N nanor

                                    @Pl45m4 Hi. Finally I succeed! I changed the protected part of my header file to:

                                    protected:
                                    bool eventFilter(QObject *obj, QEvent *event){
                                             if(obj == butt)
                                              {
                                                 if(event->type() == QEvent::Enter)
                                                 {
                                                     effect->setOpacity(1);
                                                     butt->setGraphicsEffect(effect);
                                                 }
                                                 else if(event->type() == QEvent::Leave)
                                                  {
                                                     effect->setOpacity(0.5);
                                                     butt->setGraphicsEffect(effect);
                                                  }
                                         }
                                    
                                         }
                                    
                                    

                                    and clear the bool part from the cpp file and my code worked fine.
                                    Thank you so much for the code you provided yesterday. Really appreciate your help .
                                    Best regards.

                                    Pl45m4P Offline
                                    Pl45m4P Offline
                                    Pl45m4
                                    wrote on last edited by Pl45m4
                                    #21

                                    @nanor

                                    I dont see any difference, since the code is the same and you can put your defintions / implementation in your header, but normally you put them in your code (cpp) file. You find getters / setters defined in header file very often. So I dont know what was going on before :) It should work with the code in your cpp file as well.

                                    @nanor said in How to change the QToolButton opacity when the cursor is on int?:

                                    The reason I use QDesktopWidget is that I want to have my program exe file and then use the program in different computers with different widths and heights, so I have to set geometry to my elements based on the screen geometry.

                                    There is nothing wrong with it. I also didn't say, you shouldn't do it, but there will be one day, they remove QDesktopWidget completely. It's already kept because of compatibilty reasons. With QScreen you can do the same and it will stay in Qt Framework for a longer time than QDesktopWidget.
                                    But you really should consider using layouts (you can set a fixed geometry as well as min / max sizes).


                                    If debugging is the process of removing software bugs, then programming must be the process of putting them in.

                                    ~E. W. Dijkstra

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                                    • Pl45m4P Pl45m4

                                      @nanor

                                      I dont see any difference, since the code is the same and you can put your defintions / implementation in your header, but normally you put them in your code (cpp) file. You find getters / setters defined in header file very often. So I dont know what was going on before :) It should work with the code in your cpp file as well.

                                      @nanor said in How to change the QToolButton opacity when the cursor is on int?:

                                      The reason I use QDesktopWidget is that I want to have my program exe file and then use the program in different computers with different widths and heights, so I have to set geometry to my elements based on the screen geometry.

                                      There is nothing wrong with it. I also didn't say, you shouldn't do it, but there will be one day, they remove QDesktopWidget completely. It's already kept because of compatibilty reasons. With QScreen you can do the same and it will stay in Qt Framework for a longer time than QDesktopWidget.
                                      But you really should consider using layouts (you can set a fixed geometry as well as min / max sizes).

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                                      nanor
                                      wrote on last edited by
                                      #22

                                      @Pl45m4 I didn't know about QScreen and I thought that the only way to use my device screen geometry is using QDesktopWidget. I will change it to QScreen .
                                      About layouts, also I didn't know that I can set size for them :)
                                      Thank you for valuable points you mentioned. I will definitely use them in my project.

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