Custom Widget - clicked() signal

[ak]

What shoud i do to create clicked() signal in my custom widget?

[munna]

You can have a boolean variable which will become true in mousePressEvent. In mouseReleaseEvent you can emit the signal clicked() if the boolean is true and then reset it again for the next click.

[sarode]

Hello.

Here is the sample code to do that..

class Button : public QWidget
{
       Q_OBJECT
 
       public:
            Button(....);
 
       protected:
            void mousePressEvent(QMouseEvent*);
            void mouseReleaseEvent(QMouseEvent*);
            void paintEvent(QPaintEvent*);
 
      private:
             bool state;
 
      signals:
             void clicked();
             void release();
             void pressed();
};
 
Button::Button(............)
{
     state = 0;
}
 
void Button::mousePressEvent(....)
{
         state = 1;
         repaint();
         emit pressed();
}
 
void Button::mouseReleaseEvent(....)
{
         state = 0;
         repaint();
         emit released();
         emit clicked();
}
 
void Button::paintEvent(....)
{
         if(state)
                  ...............
         else
                  .............;
}

class Button : public QWidget
{
       Q_OBJECT

       public:
            Button(....);

       protected:
            void mousePressEvent(QMouseEvent*);
            void mouseReleaseEvent(QMouseEvent*);
            void paintEvent(QPaintEvent*);
      
      private:
             bool state;
       
      signals:
             void clicked();
             void release();
             void pressed();
};

Button::Button(............)
{
     state = 0;
}

void Button::mousePressEvent(....)
{
         state = 1;
         repaint();
         emit pressed();
}

void Button::mouseReleaseEvent(....)
{
         state = 0;
         repaint();
         emit released();
         emit clicked();
}

void Button::paintEvent(....)
{
         if(state)
                  ...............
         else
                  .............;
}

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.

Based on the state value repaint the button as you need and call the signal with any object like this

Button *b = new Button(0);
connect(b, SIGNAL(clicked()), qApp, SLOT(quit()));

Button *b = new Button(0);
connect(b, SIGNAL(clicked()), qApp, SLOT(quit()));

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You can try this options here

Cheers

[wysota]

void Button::mouseReleaseEvent(....)
{
         state = 0;
         repaint();
         emit released();
         emit clicked();
}

void Button::mouseReleaseEvent(....)
{
         state = 0;
         repaint();
         emit released();
         emit clicked();
}

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.

Based on the state value repaint the button as you need

It's better to update() than to repaint(), repaint() calls are not merged which may slow down the application a bit (or much, depending on how complex is the painting routine).