Image into QMdiArea (again)

[vcp]

Hi people,

I did like to put an image (logo) in my MdiArea. Already I tried many methods but nothing worked.
The application main window was created with QDesigner and I create the mdiarea like this:

qBuilder::qBuilder(QWidget* parent, Qt::WFlags fl)
: QMainWindow( parent, fl ), Ui::formQBuilder()
{
setupUi(this);
mdiArea = new QMdiArea(this);
setCentralWidget(mdiArea);

}

I try use:

QImage img("logo.jpg");
mdiArea->setBackground(QPixmap::fromImage(img));

but the logo is showd in tiled mode. Already I tried to use also QPaintEvent but also didn't works

Can someone help me to resolve this problem?

Thanks

[Lykurg]

qBuilder::qBuilder(QWidget* parent, Qt::WFlags fl)
: QMainWindow( parent, fl ), Ui::formQBuilder()
{
setupUi(this);
mdiArea = new QMdiArea(this);
setCentralWidget(mdiArea);

}

Ok, that looks stange to me. Normally you set the QMdiArea already in the designer so only "setupUi(this);" is necessary (or how's your ui file) and then just set the background:

qBuilder::qBuilder(QWidget* parent, Qt::WFlags fl)
: QMainWindow( parent, fl ), Ui::formQBuilder()
{
	setupUi(this);
        QImage img("logo.jpg");
         mdiArea->setBackground(img);     
}

qBuilder::qBuilder(QWidget* parent, Qt::WFlags fl)
: QMainWindow( parent, fl ), Ui::formQBuilder()
{
	setupUi(this);
        QImage img("logo.jpg");
         mdiArea->setBackground(img);     
}

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Not proofed, but should work if "logo.jpg" exists.

Lykurg

[vcp]

Hi thanks for your answer, but the problem is that the image is shown side by side (tiled)

[Lykurg]

Hi thanks for your answer, but the problem is that the image is shown side by side (tiled)

Ah, sorry, have read to fast. So you have to subclass:

#ifndef MYQMIDIAREA_H
#define MYQMIDIAREA_H
 
#include <QtGui>
 
class myQMdiArea : public QMdiArea
{
  Q_OBJECT
  public:
    myQMdiArea(QWidget *parent = 0);
  protected:
    void paintEvent(QPaintEvent *);
};
 
#endif // MYQMIDIAREA_H

#ifndef MYQMIDIAREA_H
#define MYQMIDIAREA_H

#include <QtGui>

class myQMdiArea : public QMdiArea
{
  Q_OBJECT
  public:
    myQMdiArea(QWidget *parent = 0);
  protected:
    void paintEvent(QPaintEvent *);
};

#endif // MYQMIDIAREA_H

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#include "myqmdiarea.h"
 
myQMdiArea::myQMdiArea(QWidget *parent) 
  : QMdiArea(parent)
{}
 
void myQMdiArea::paintEvent(QPaintEvent *paintEvent)
{
  QPainter painter(viewport());
  painter.fillRect(paintEvent->rect(), QColor(23,200,123));
  QImage img("/home/lykurg/Desktop/icons/oxygen/16x16/apps/gimp.png");
  painter.drawImage(QPointF(10,10),img);
}

#include "myqmdiarea.h"

myQMdiArea::myQMdiArea(QWidget *parent) 
  : QMdiArea(parent)
{}

void myQMdiArea::paintEvent(QPaintEvent *paintEvent)
{
  QPainter painter(viewport());
  painter.fillRect(paintEvent->rect(), QColor(23,200,123));
  QImage img("/home/lykurg/Desktop/icons/oxygen/16x16/apps/gimp.png");
  painter.drawImage(QPointF(10,10),img);
}

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Note: the paintEvent is not very nice, only an example!

[Lykurg]

ok, better in paintEvent:

void myQMdiArea::paintEvent(QPaintEvent *paintEvent)
{
  QMdiArea::paintEvent(paintEvent);
  // and now only paint your image here
}

void myQMdiArea::paintEvent(QPaintEvent *paintEvent)
{
  QMdiArea::paintEvent(paintEvent);
  // and now only paint your image here
}

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[vcp]

Hi Lykurg,

Yor explanation was very good and simple.

Thanks a lot! You help

[cia.michele]

Hello to everybody,
I'm a newbie of c++ and QT and i need to place an image in the center of a QMdiArea. I take your code but... how can I use it into QtCreator form? I tryed to promote a widget but QMdiArea can't be used as base widget , so I tryed to create plugin but it can't be attached (or I didn't be able to do it) to QtCreator widget list (, and more, how can I change the image from there? How can I change your constant in a property or pass it from the upper class using it?

Thanks a lot for your time.

Michele

PS. I'm using 2010.04 QT sdk on Windows