How to draw QRubberBand with red color

[lni]

Hi,

I am using QRubberBand to zoom the scene when user clicks and drags a rectangle area. How can I set the QRubberBand to different color, such as red?

Thanks

[lni]

Never mind, soloved!

[aamer4yu]

Can you post the solution too

[lni]

Can you post the solution too

You won't like it. Codes were developed in Linux, and after moved to Windows, I got rubber band filled with red, so now I have to use #ifdef... too bad...

class LinuxRubberBand : public QRubberBand
{
public:
 
  LinuxRubberBand( Shape s, QWidget * p = 0 ) : QRubberBand( s, p ) {
    QPalette palette;
    palette.setBrush( QPalette::WindowText, QBrush( Qt::red ) );
    setPalette(palette);
  }
 
protected:
 
  virtual void paintEvent( QPaintEvent * ) {
    QStylePainter painter(this);
 
    QStyleOptionFocusRect option;
    option.initFrom( this );
 
    painter.drawControl(QStyle::CE_FocusFrame, option);
  }
 
};
 
QRubberBand* createRubberBand()
{
  QRubberBand* rubberBand( 0 );
 
#ifdef Q_WS_WIN
  rubberBand = new QRubberBand( QRubberBand::Rectangle, 0 ) ),
#else
  rubberBand = new LinuxRubberBand( QRubberBand::Rectangle, 0 ) ),
#endif
 
  return rubberBand;
}

class LinuxRubberBand : public QRubberBand
{
public:

  LinuxRubberBand( Shape s, QWidget * p = 0 ) : QRubberBand( s, p ) {
    QPalette palette;
    palette.setBrush( QPalette::WindowText, QBrush( Qt::red ) );
    setPalette(palette);
  }

protected:

  virtual void paintEvent( QPaintEvent * ) {
    QStylePainter painter(this);

    QStyleOptionFocusRect option;
    option.initFrom( this );

    painter.drawControl(QStyle::CE_FocusFrame, option);
  }

};
 
QRubberBand* createRubberBand()
{
  QRubberBand* rubberBand( 0 );

#ifdef Q_WS_WIN
  rubberBand = new QRubberBand( QRubberBand::Rectangle, 0 ) ),
#else
  rubberBand = new LinuxRubberBand( QRubberBand::Rectangle, 0 ) ),
#endif

  return rubberBand;
}

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[aamer4yu]

One question ...
why did you inherit ? you could have very well set the palette on the object of QRubberBand, isnt it ?

[lni]

One question ...
why did you inherit ? you could have very well set the palette on the object of QRubberBand, isnt it ?

I did that but it didn't work...

I switch to QStyleOptionFocusRect and it works (on Linux)...

[zgulser]

Hi,

As aamer pointed out, is there a way to draw QRubberBand object with another color without inheriting the QRubberBand?

I've tried to solve it using style sheet and palette but neither of them worked.

[zgulser]

Hi,


Regarding the solution posted above, is it possible to make the rubberband dashed line also by using QPalette or something?

[aamer4yu]

You may try subclassing QRubberBand and setting palette while drawing.

[zgulser]

Hi,

That's what I exactly did..but I couldn't find to how to set "dashed line" for QPalette.

[aamer4yu]

Check Qt::PenStyle.
QPainter::setPen

[zgulser]

I did it as well in the paintEvent method of my rubberband class but it didn't make any difference. I guess QPalette overwrites QPainter or something.

[aamer4yu]

May be if you show some code, or give compilable code we can see whats wrong

[zgulser]

I love to..

class CustomRubberBand : QRubberBand
	{
 
 
		CustomRubberBand( Shape s) : QRubberBand (s)
		{
 			QPalette palette;
 			palette.setBrush(QPalette::WindowText, QBrush(Qt::red));
			setPalette(palette);
 
			repaint();
		}
 
		void paintEvent(QPaintEvent *)
		{
			QStylePainter painter(this);
 
			QStyleOptionFocusRect option;
 
			option.initFrom(this);
 
			painter.begin(this);
 
			QPen pen;
			pen.setStyle(Qt::DashLine);
			pen.setWidth(2);
			pen.setColor(QColor(Qt::red));
			painter.setPen(pen);
 
			painter.drawControl(QStyle::CE_FocusFrame, option);
		}
 
		friend class MyGraphView;
 
	};

class CustomRubberBand : QRubberBand
	{
		

		CustomRubberBand( Shape s) : QRubberBand (s)
		{
 			QPalette palette;
 			palette.setBrush(QPalette::WindowText, QBrush(Qt::red));
			setPalette(palette);

			repaint();
		}

		void paintEvent(QPaintEvent *)
		{
			QStylePainter painter(this);

			QStyleOptionFocusRect option;
			
			option.initFrom(this);
	
			painter.begin(this);

			QPen pen;
			pen.setStyle(Qt::DashLine);
			pen.setWidth(2);
			pen.setColor(QColor(Qt::red));
			painter.setPen(pen);

			painter.drawControl(QStyle::CE_FocusFrame, option);
		}

		friend class MyGraphView;

	};

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[aamer4yu]

What if you simply draw a rectangle painter.drawRect(...)
instead of the painter.drawControl(QStyle::CE_FocusFrame, option);

??

[zgulser]

Simply worked beautifully. Thanks