How to paint rectangle around a button considering Padding and margins

DonCoder

QPushButton {
color: #333;
border: 2px solid #555;
border-radius: 20px;
border-style: outset;
padding: 15px;
margin-left:10px
margin-right:10px
}

Now there is a padding and margin has been set on my pushbutton. How to draw a rectangle around the pushbutton after applying the margins and padding. So i can visualize how my button is occupying space.

The reason i am asking this question is in my application i am using different styling for different ui elements. when i am placing it in any layouts the vertical and horizontal gaps are uneven. I want to identify why the uneven spaces are coming into picture

mrjj

Hi
Do you mean you want to draw on top of the pushbutton to show the actual size?
like
alt text

we cannot draw outside the button.

DonCoder

@mrjj Consider my custom widget has a layout and push button is one of the item in the layout. Now in the CUstomWidget paint function, Can i draw that rectangle by measuring the button geometry and calculating its margins and padding ?

mrjj

@DonCoder

Hi
Sadly we cannot really read any values set in the stylesheet so
you cant visualize it, if that is the goal.
We can only show the true geometry (the red frame).

DonCoder

@mrjj said in How to paint rectangle around a button considering Padding and margins:

We can only show the true geometry (the red frame).

How can we show the true geometry ?? does the geometry() interface provides it ?

mrjj

@DonCoder

Well the function
https://doc.qt.io/qt-5/qwidget.html#rect-prop
Tell its client area
geometry() tells location within the Parent but for widgets (non window)
also the size.

What i did with the sample was to subclass QPushButton

#include <QPushButton>
#include <QPainter>

class VisButton : public QPushButton
{
    Q_OBJECT
public:
    explicit VisButton(QWidget *parent = nullptr) : QPushButton(parent) {  
    }

protected:
    virtual void paintEvent(QPaintEvent *event) override
    {
        QPushButton::paintEvent(event); // paint as normal
        
        QPainter p(this);
        p.setPen(Qt::red);
        p.drawRect(0,0, width()-1, height()-1); // paint frame.
        
    }
};

#endif // VISBUTTON_H

and then promote it
alt text

Then it draws itself according to the stylesheet and we "overlay"
a red frame.

Not 100% sure, its what you want but it will show how the margins is in relation to the
Widgets area

DonCoder

Thanks... I ll try this

SGaist

Hi,

You might also want to check KDAB's GammaRay to inspect your application.