QGLWidget problem

**MarkoSan** · 7th December 2007, 19:28

Is it possible to place all controls I need directly to QMainWIndow? So there is no more need of any "foundation" widgets?

**jacek** · 7th December 2007, 20:10

Originally Posted by MarkoSan

Is it possible to place all controls I need directly to QMainWIndow? So there is no more need of any "foundation" widgets?

No, QMainWindow has a special layout that you can't change, but you can use QWidget instead.

**MarkoSan** · 7th December 2007, 22:34

Originally Posted by jacek

No, QMainWindow has a special layout that you can't change, but you can use QWidget instead.

So, I try following:

On QMainWindow, I create QWidget and then I setup it as QMainWindow's central widget?

**jacek** · 7th December 2007, 22:42

Originally Posted by MarkoSan

On QMainWindow, I create QWidget and then I setup it as QMainWindow's central widget?

Yes, of course the main window takes the ownership of this widget, so you don't have to care about its deletion.

**MarkoSan** · 7th December 2007, 22:45

Originally Posted by MarkoSan

So, I try following:

On QMainWindow, I create QWidget and then I setup it as QMainWindow's central widget?

I did that and it WORKS!

Thanks a lot to all of you

**MarkoSan** · 8th December 2007, 06:28

Well, I simply do not get it anymore. Here is the code. Now I want to add an QTableWidget near QGLWidget and I get same problem over again. I add to layout using:

Qt Code:

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m_pVLayout->addLayout(m_pHLayout);    // add horiz. layout to vertical layout
    m_pMainLayout->addLayout(m_pVLayout);    // adds vert. layout to main layout
    m_pMainLayout->addWidget(m_pMerchandizeTable);    // adds merchandize table to layout
    //m_pMainLayout->addWidget(pTWidget);    // test
    //setLayout(m_pVLayout);    // sets main layout on widget
    setLayout(m_pMainLayout);    // sets main layout on widget

m_pVLayout->addLayout(m_pHLayout);    // add horiz. layout to vertical layout
    m_pMainLayout->addLayout(m_pVLayout);    // adds vert. layout to main layout
    m_pMainLayout->addWidget(m_pMerchandizeTable);    // adds merchandize table to layout
    //m_pMainLayout->addWidget(pTWidget);    // test
    //setLayout(m_pVLayout);    // sets main layout on widget
    setLayout(m_pMainLayout);    // sets main layout on widget

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and table widget is visibible, but in upper left corner again. Why????!!!

**jacek** · 8th December 2007, 14:26

What widget do you call the setLayout() method on? And why can't you use Qt Designer?

**MarkoSan** · 8th December 2007, 14:37

Well, setLayout is called on class COperationWindow (derived from QWidget), which contains QGLWidget, QLabel and three QPusbuttons. Here is a code:

Qt Code:

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#include "COperationWIndow.h"
 
COperationWIndow::COperationWIndow(QWidget* pParent) : QWidget(pParent)
//COperationWIndow::COperationWIndow(QWidget* pParent) : QDockWidget(pParent)
{
    //setAllowedAreas(Qt::LeftDockWidgetArea);    // sets allowed dock area
    //setWindowOpacity(rDefaultWindowOpacity);    // sets window opacity
    setWindowTitle(trUtf8("Jedilni list"));    // sets window title 
 
    QFont m_cFont("1942 report", 72, QFont::Bold);    // sets up font
    //QFont m_cFont("MomÂ´sTypewriter", 72, QFont::Bold);    // sets up font
    //m_cFont.setStretch(QFont::UltraCondensed);    // sets strech factor
 
    // sets black background for this window
    setAutoFillBackground(true);
    m_cPalette=this->palette();    // gets current pallete of current widget
    m_cPalette.setColor(QPalette::Background, Qt::black);    // sets background color of widget
    this->setPalette(m_cPalette);
 
    // layout creation
    m_pVLayout=new QVBoxLayout(this);    // creates new vertical layout
    Q_CHECK_PTR(m_pVLayout);    // checks creation
    m_pHLayout=new QHBoxLayout(this);    // creates new horizontal layout
    Q_CHECK_PTR(m_pHLayout);    // checks creation
    m_pMainLayout=new QHBoxLayout(this);    // creates main layout
    Q_CHECK_PTR(m_pMainLayout);    // checks creation
 
    // creates merchandize browser
    m_pMerchandizeBrowser=new CMerchandizeBrowser(this);    // creates new merchandize selector
    //m_pMerchandizeBrowser=new CMerchandizeBrowser(pParent);    // creates new merchandize selector
    Q_CHECK_PTR(m_pMerchandizeBrowser);    // checks creation
 
    // creates Left Selector pushbutton
    m_pLeftButtonMerchandizeSelector=new QPushButton(trUtf8("Levo"), this);
    //m_pLeftButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira levega artikla"), pParent);
    Q_CHECK_PTR(m_pLeftButtonMerchandizeSelector);    // checks creation
    //m_pLeftButtonMerchandizeSelector->setFlat(true);    // sets flat flag
    // sets new size
    //m_pLeftButtonMerchandizeSelector->resize(iMerchandizeButtonSelectorWidth, iMerchandizeButtonSelectorHeight);
    connect(m_pLeftButtonMerchandizeSelector,
            SIGNAL(clicked()),
            this,
            SLOT(showLeftMerchandize()));
 
    // creates merchandizer confirmer
    m_pButtonMerchandizeConfirmer=new QPushButton(trUtf8("IZBERI"), this);
    Q_CHECK_PTR(m_pButtonMerchandizeConfirmer);
    connect(m_pButtonMerchandizeConfirmer,
            SIGNAL(clicked()),
            this,
            SLOT(chooseMerchandize()));
 
    // creates Right Selector pushbutton
    m_pRightButtonMerchandizeSelector=new QPushButton(trUtf8("Desno"), this);
    //m_pRightButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira desnegs artikla"), pParent);
    Q_CHECK_PTR(m_pRightButtonMerchandizeSelector);    // checks creation
    //m_pRightButtonMerchandizeSelector->setFlat(true);    // sets flat flag
    // sets new size
    //m_pRightButtonMerchandizeSelector->resize(iMerchandizeButtonSelectorWidth, iMerchandizeButtonSelectorHeight);
    connect(m_pRightButtonMerchandizeSelector,
            SIGNAL(clicked()),
            this,
            SLOT(showRightMerchandize()));
 
    // left button color setup
    m_cPalette=m_pLeftButtonMerchandizeSelector->palette();    // gets current pallete of button "Left"
    m_cPalette.setColor(QPalette::Button, Qt::black);    // sets up new palette componenet
    m_cPalette.setColor(QPalette::ButtonText, Qt::white);    // sets up new palette componenet
    m_pLeftButtonMerchandizeSelector->setPalette(m_cPalette);    // sets new pallete
    m_pLeftButtonMerchandizeSelector->setFont(m_cFont);    // sets new font
 
    // confirmer button color setup
    m_cPalette=m_pButtonMerchandizeConfirmer->palette();    // gets current pallete of button "Left"
    m_cPalette.setColor(QPalette::Button, Qt::blue);    // sets up new palette componenet
    m_cPalette.setColor(QPalette::ButtonText, Qt::black);    // sets up new palette componenet
    m_pButtonMerchandizeConfirmer->setPalette(m_cPalette);    // sets new pallete
    m_pButtonMerchandizeConfirmer->setFont(m_cFont);    // sets new font
 
    // right button color setup
    m_cPalette=m_pRightButtonMerchandizeSelector->palette();    // gets current pallete of button "Right"
    m_cPalette.setColor(QPalette::Button, Qt::black);    // sets up new palette componenet
    m_cPalette.setColor(QPalette::ButtonText, Qt::white);    // sets up new palette componenet
    m_pRightButtonMerchandizeSelector->setPalette(m_cPalette);    // sets new pallete
    m_pRightButtonMerchandizeSelector->setFont(m_cFont);    // sets new font
 
    // TODO: show selected merchandize name and price
 
    // table of ordered merchandize creation
/*
    m_pMerchandizeTable=new QTableWidget(this);    // creates new table
    Q_CHECK_PTR(m_pMerchandizeTable);    // checks creation
    m_pMerchandizeTable->setColumnCount(iNrColumns);    // sets number of columns
    m_pMerchandizeTable->setRowCount(iNrRows);    // sets number of rows
*/
 
    // selected merchandize name label widget
    m_pMerchandizeNameLabel=new QLabel(this);    // creates new label
    Q_CHECK_PTR(m_pMerchandizeNameLabel);    // checks creation
    m_cPalette=m_pMerchandizeNameLabel->palette();    // geta label palette
    m_cPalette.setColor(QPalette::Text, QColor(240, 167, 16));    // sets palette color
    QFont labelFont("Rothenburg Decorative", 36, QFont::Bold);    // sets up new font
    m_pMerchandizeNameLabel->setFont(labelFont);    // sets font
    m_pMerchandizeNameLabel->setFrameStyle(QFrame::Sunken);    // sets decoration
    // sets selected merchandize name    
    m_pMerchandizeNameLabel->setText(m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected()));
    m_pMerchandizeNameLabel->setAlignment(Qt::AlignCenter);    // set text justification to "centering"
    qDebug() << m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected());
 
    // layouts setup
    m_pHLayout->addWidget(m_pLeftButtonMerchandizeSelector);    // adds button to horiz. layout
    m_pHLayout->addWidget(m_pButtonMerchandizeConfirmer);    // adds a button to horiz. layout
    m_pHLayout->addWidget(m_pRightButtonMerchandizeSelector);    // adds button to horiz. layout
 
    m_pVLayout->addWidget(m_pMerchandizeBrowser);    // adds merchandize selector to vertical layout
    m_pVLayout->addWidget(m_pMerchandizeNameLabel);    // adds merchandize name label to vertical layout
    m_pVLayout->addLayout(m_pHLayout);    // add horiz. layout to vertical layout
    m_pMainLayout->addLayout(m_pVLayout);    // adds vert. layout to main layout
    //m_pMainLayout->addWidget(m_pMerchandizeTable);    // adds merchandize table to layout
    setLayout(m_pMainLayout);    // sets main layout on widget
 
    // creats new timer, binded to main application object
/*
    QPointer<QTimer> m_pAdvertisementTimer=new QTimer(this);
    Q_CHECK_PTR(m_pAdvertisementTimer);    // checks creation
    connect(m_pAdvertisementTimer, SIGNAL(timeout()), this, SLOT(startAdvertising()));
    m_pAdvertisementTimer->start(iAdvertisingTimeout);    // restarts advertisement timer
*/
}
 
void COperationWIndow::showLeftMerchandize()
{
    m_iSelected=m_pMerchandizeBrowser->getSelected()-1;    // selects left merchandize
    m_pMerchandizeBrowser->setSelected(m_iSelected);
    m_pMerchandizeNameLabel->setText(m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected()));
    m_pMerchandizeNameLabel->setAlignment(Qt::AlignCenter);    // set text justification to "centering"
    m_pMerchandizeBrowser->update();
    //m_pAdvertisementTimer->start(iAdvertisingTimeout);    // restarts advertisement timer
}
 
void COperationWIndow::showRightMerchandize()
{
    m_iSelected=m_pMerchandizeBrowser->getSelected()+1;    // selects left merchandize
    m_pMerchandizeBrowser->setSelected(m_iSelected);
    m_pMerchandizeNameLabel->setText(m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected()));
    m_pMerchandizeNameLabel->setAlignment(Qt::AlignCenter);    // set text justification to "centering"
    m_pMerchandizeBrowser->update();    // showa selected merchandize
    //m_pAdvertisementTimer->start(iAdvertisingTimeout);    // restarts advertisement timer
}
 
// slot for choosing merchandize
void COperationWIndow::chooseMerchandize()
{
}
 
// slot for showing advertisement banners
void COperationWIndow::startAdvertising()
{
}
 
COperationWIndow::~COperationWIndow()
{
}

#include "COperationWIndow.h"

COperationWIndow::COperationWIndow(QWidget* pParent) : QWidget(pParent)
//COperationWIndow::COperationWIndow(QWidget* pParent) : QDockWidget(pParent)
{
    //setAllowedAreas(Qt::LeftDockWidgetArea);    // sets allowed dock area
    //setWindowOpacity(rDefaultWindowOpacity);    // sets window opacity
    setWindowTitle(trUtf8("Jedilni list"));    // sets window title 
    
    QFont m_cFont("1942 report", 72, QFont::Bold);    // sets up font
    //QFont m_cFont("MomÂ´sTypewriter", 72, QFont::Bold);    // sets up font
    //m_cFont.setStretch(QFont::UltraCondensed);    // sets strech factor

    // sets black background for this window
    setAutoFillBackground(true);
    m_cPalette=this->palette();    // gets current pallete of current widget
    m_cPalette.setColor(QPalette::Background, Qt::black);    // sets background color of widget
    this->setPalette(m_cPalette);

    // layout creation
    m_pVLayout=new QVBoxLayout(this);    // creates new vertical layout
    Q_CHECK_PTR(m_pVLayout);    // checks creation
    m_pHLayout=new QHBoxLayout(this);    // creates new horizontal layout
    Q_CHECK_PTR(m_pHLayout);    // checks creation
    m_pMainLayout=new QHBoxLayout(this);    // creates main layout
    Q_CHECK_PTR(m_pMainLayout);    // checks creation
    
    // creates merchandize browser
    m_pMerchandizeBrowser=new CMerchandizeBrowser(this);    // creates new merchandize selector
    //m_pMerchandizeBrowser=new CMerchandizeBrowser(pParent);    // creates new merchandize selector
    Q_CHECK_PTR(m_pMerchandizeBrowser);    // checks creation
        
    // creates Left Selector pushbutton
    m_pLeftButtonMerchandizeSelector=new QPushButton(trUtf8("Levo"), this);
    //m_pLeftButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira levega artikla"), pParent);
    Q_CHECK_PTR(m_pLeftButtonMerchandizeSelector);    // checks creation
    //m_pLeftButtonMerchandizeSelector->setFlat(true);    // sets flat flag
    // sets new size
    //m_pLeftButtonMerchandizeSelector->resize(iMerchandizeButtonSelectorWidth, iMerchandizeButtonSelectorHeight);
    connect(m_pLeftButtonMerchandizeSelector,
            SIGNAL(clicked()),
            this,
            SLOT(showLeftMerchandize()));
    
    // creates merchandizer confirmer
    m_pButtonMerchandizeConfirmer=new QPushButton(trUtf8("IZBERI"), this);
    Q_CHECK_PTR(m_pButtonMerchandizeConfirmer);
    connect(m_pButtonMerchandizeConfirmer,
            SIGNAL(clicked()),
            this,
            SLOT(chooseMerchandize()));
    
    // creates Right Selector pushbutton
    m_pRightButtonMerchandizeSelector=new QPushButton(trUtf8("Desno"), this);
    //m_pRightButtonMerchandizeSelector=new QPushButton(trUtf8("Izbira desnegs artikla"), pParent);
    Q_CHECK_PTR(m_pRightButtonMerchandizeSelector);    // checks creation
    //m_pRightButtonMerchandizeSelector->setFlat(true);    // sets flat flag
    // sets new size
    //m_pRightButtonMerchandizeSelector->resize(iMerchandizeButtonSelectorWidth, iMerchandizeButtonSelectorHeight);
    connect(m_pRightButtonMerchandizeSelector,
            SIGNAL(clicked()),
            this,
            SLOT(showRightMerchandize()));
    
    // left button color setup
    m_cPalette=m_pLeftButtonMerchandizeSelector->palette();    // gets current pallete of button "Left"
    m_cPalette.setColor(QPalette::Button, Qt::black);    // sets up new palette componenet
    m_cPalette.setColor(QPalette::ButtonText, Qt::white);    // sets up new palette componenet
    m_pLeftButtonMerchandizeSelector->setPalette(m_cPalette);    // sets new pallete
    m_pLeftButtonMerchandizeSelector->setFont(m_cFont);    // sets new font

    // confirmer button color setup
    m_cPalette=m_pButtonMerchandizeConfirmer->palette();    // gets current pallete of button "Left"
    m_cPalette.setColor(QPalette::Button, Qt::blue);    // sets up new palette componenet
    m_cPalette.setColor(QPalette::ButtonText, Qt::black);    // sets up new palette componenet
    m_pButtonMerchandizeConfirmer->setPalette(m_cPalette);    // sets new pallete
    m_pButtonMerchandizeConfirmer->setFont(m_cFont);    // sets new font
    
    // right button color setup
    m_cPalette=m_pRightButtonMerchandizeSelector->palette();    // gets current pallete of button "Right"
    m_cPalette.setColor(QPalette::Button, Qt::black);    // sets up new palette componenet
    m_cPalette.setColor(QPalette::ButtonText, Qt::white);    // sets up new palette componenet
    m_pRightButtonMerchandizeSelector->setPalette(m_cPalette);    // sets new pallete
    m_pRightButtonMerchandizeSelector->setFont(m_cFont);    // sets new font

    // TODO: show selected merchandize name and price

    // table of ordered merchandize creation
/*
    m_pMerchandizeTable=new QTableWidget(this);    // creates new table
    Q_CHECK_PTR(m_pMerchandizeTable);    // checks creation
    m_pMerchandizeTable->setColumnCount(iNrColumns);    // sets number of columns
    m_pMerchandizeTable->setRowCount(iNrRows);    // sets number of rows
*/

    // selected merchandize name label widget
    m_pMerchandizeNameLabel=new QLabel(this);    // creates new label
    Q_CHECK_PTR(m_pMerchandizeNameLabel);    // checks creation
    m_cPalette=m_pMerchandizeNameLabel->palette();    // geta label palette
    m_cPalette.setColor(QPalette::Text, QColor(240, 167, 16));    // sets palette color
    QFont labelFont("Rothenburg Decorative", 36, QFont::Bold);    // sets up new font
    m_pMerchandizeNameLabel->setFont(labelFont);    // sets font
    m_pMerchandizeNameLabel->setFrameStyle(QFrame::Sunken);    // sets decoration
    // sets selected merchandize name    
    m_pMerchandizeNameLabel->setText(m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected()));
    m_pMerchandizeNameLabel->setAlignment(Qt::AlignCenter);    // set text justification to "centering"
    qDebug() << m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected());
    
    // layouts setup
    m_pHLayout->addWidget(m_pLeftButtonMerchandizeSelector);    // adds button to horiz. layout
    m_pHLayout->addWidget(m_pButtonMerchandizeConfirmer);    // adds a button to horiz. layout
    m_pHLayout->addWidget(m_pRightButtonMerchandizeSelector);    // adds button to horiz. layout

    m_pVLayout->addWidget(m_pMerchandizeBrowser);    // adds merchandize selector to vertical layout
    m_pVLayout->addWidget(m_pMerchandizeNameLabel);    // adds merchandize name label to vertical layout
    m_pVLayout->addLayout(m_pHLayout);    // add horiz. layout to vertical layout
    m_pMainLayout->addLayout(m_pVLayout);    // adds vert. layout to main layout
    //m_pMainLayout->addWidget(m_pMerchandizeTable);    // adds merchandize table to layout
    setLayout(m_pMainLayout);    // sets main layout on widget

    // creats new timer, binded to main application object
/*
    QPointer<QTimer> m_pAdvertisementTimer=new QTimer(this);
    Q_CHECK_PTR(m_pAdvertisementTimer);    // checks creation
    connect(m_pAdvertisementTimer, SIGNAL(timeout()), this, SLOT(startAdvertising()));
    m_pAdvertisementTimer->start(iAdvertisingTimeout);    // restarts advertisement timer
*/
}

void COperationWIndow::showLeftMerchandize()
{
    m_iSelected=m_pMerchandizeBrowser->getSelected()-1;    // selects left merchandize
    m_pMerchandizeBrowser->setSelected(m_iSelected);
    m_pMerchandizeNameLabel->setText(m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected()));
    m_pMerchandizeNameLabel->setAlignment(Qt::AlignCenter);    // set text justification to "centering"
    m_pMerchandizeBrowser->update();
    //m_pAdvertisementTimer->start(iAdvertisingTimeout);    // restarts advertisement timer
}

void COperationWIndow::showRightMerchandize()
{
    m_iSelected=m_pMerchandizeBrowser->getSelected()+1;    // selects left merchandize
    m_pMerchandizeBrowser->setSelected(m_iSelected);
    m_pMerchandizeNameLabel->setText(m_pMerchandizeBrowser->getMerchandizeName(m_pMerchandizeBrowser->getSelected()));
    m_pMerchandizeNameLabel->setAlignment(Qt::AlignCenter);    // set text justification to "centering"
    m_pMerchandizeBrowser->update();    // showa selected merchandize
    //m_pAdvertisementTimer->start(iAdvertisingTimeout);    // restarts advertisement timer
}

// slot for choosing merchandize
void COperationWIndow::chooseMerchandize()
{
}

// slot for showing advertisement banners
void COperationWIndow::startAdvertising()
{
}

COperationWIndow::~COperationWIndow()
{
}

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I do not use designet because I simply do not like it. And by the way, Qlabel DOES NOT show any text and this is simply driving me mad right now. And I know I've momentaly commented the code regarding QTableWidget, it's for testing purposes only, nevertheless, once qtablewidget code is uncommented the problem remains.

**jacek** · 8th December 2007, 15:08

Originally Posted by MarkoSan

m_pVLayout=new QVBoxLayout(this); // creates new vertical layout
Q_CHECK_PTR(m_pVLayout); // checks creation
m_pHLayout=new QHBoxLayout(this); // creates new horizontal layout
Q_CHECK_PTR(m_pHLayout); // checks creation
m_pMainLayout=new QHBoxLayout(this); // creates main layout
Q_CHECK_PTR(m_pMainLayout); // checks creation

You shouldn't pass "this" to layouts' constructors, because they will call setLayout() on the parent.

Originally Posted by MarkoSan

I do not use designet because I simply do not like it.

Like it or not, but it would take you only a couple of minutes to set up this widget in Qt Designer.

Originally Posted by MarkoSan

And by the way, Qlabel DOES NOT show any text and this is simply driving me mad right now.

Because you should use QPalette::WindowText instead of QPalette::Text and you have to set the changed palette back on the label to see the effect.

**MarkoSan** · 8th December 2007, 15:21

Originally Posted by jacek

You shouldn't pass "this" to layouts' constructors, because they will call setLayout() on the parent.

Like it or not, but it would take you only a couple of minutes to set up this widget in Qt Designer.

Because you should use QPalette::WindowText instead of QPalette::Text and you have to set the changed palette back on the label to see the effect.

Jacek, thanks on tip on QLabel, it works now. But whenever I create Layouts with "this" parameter or without, result of placing QWIdgetTable is still the same.

**jacek** · 8th December 2007, 15:26

Originally Posted by MarkoSan

whenever I create Layouts with "this" parameter or without, result of placing QWIdgetTable is still the same.

Is this what you are trying to achieve?

**MarkoSan** · 8th December 2007, 15:30

Yessssssss! But whatever I do, I get same result: QTableWidget is in upper left corner and therefore this is NOT ok. I want result excatly as on your pic.

**jacek** · 8th December 2007, 15:35

That's weird, because I've just uncommented the m_pMerchandizeTable lines (including the one with addWidget()). Run "make clean" and make sure you don't pass any parents to layout constructors.

**MarkoSan** · 8th December 2007, 15:50

Originally Posted by jacek

That's weird, because I've just uncommented the m_pMerchandizeTable lines (including the one with addWidget()). Run "make clean" and make sure you don't pass any parents to layout constructors.

I deleted manually all ..\debug\ files and now it works. I do not get it what was wrong. Jacek, thanks!!!

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