Window colour

[phillip_Qt]

Hi all
Can any body tell me how to add colour in windows. i need 2 change the colour of windows to red from default. but im not able 2 do.

Thank you all

[wysota]

You mean the background? Make sure the autoFillBackground property of the widget is set to true and set a colour of your choice as QPalette::Background role of the widget's palette.

[phillip_Qt]

Ya autoFillBackground is set as True. i also added
ui.CancelButton->setBackgroundRole((QPalette::ColorRole)Qt::red ); in constructor as i need cancelButton as red. But nothing is working. Can u plz tell me how to colour the window.



Thank you.

[ashukla]

QPalette palette;
    QBrush brush(QColor(255, 255, 255, 255));
    brush.setStyle(Qt::SolidPattern);
    palette.setBrush(QPalette::Active, QPalette::Base, brush); /*It is for Widget Base Background*/
    QBrush brush1(QColor(255, 0,0, 255));
    brush1.setStyle(Qt::SolidPattern);
    palette.setBrush(QPalette::Active, QPalette::Window, brush1);/*It is for widget Background*/
    palette.setBrush(QPalette::Inactive, QPalette::Base, brush);
    palette.setBrush(QPalette::Inactive, QPalette::Window, brush1);
    palette.setBrush(QPalette::Disabled, QPalette::Base, brush1);
    palette.setBrush(QPalette::Disabled, QPalette::Window, brush1);
    ui.CancelButton->setPalette(palette);

QPalette palette;
    QBrush brush(QColor(255, 255, 255, 255));
    brush.setStyle(Qt::SolidPattern);
    palette.setBrush(QPalette::Active, QPalette::Base, brush); /*It is for Widget Base Background*/
    QBrush brush1(QColor(255, 0,0, 255));
    brush1.setStyle(Qt::SolidPattern);
    palette.setBrush(QPalette::Active, QPalette::Window, brush1);/*It is for widget Background*/
    palette.setBrush(QPalette::Inactive, QPalette::Base, brush);
    palette.setBrush(QPalette::Inactive, QPalette::Window, brush1);
    palette.setBrush(QPalette::Disabled, QPalette::Base, brush1);
    palette.setBrush(QPalette::Disabled, QPalette::Window, brush1);
    ui.CancelButton->setPalette(palette);

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then Make sure the autoFillBackground property of the widget is set to true.
hope this help!

[wysota]

in constructor as i need cancelButton as red.

Oh... a "red push button" issue You'll have to use stylesheets for that ( background-color: red; ).

[phillip_Qt]

I ve solved the problem.

Thank you all .

[phillip_Qt]

HI all.
I ve changed the colour of window by usning the code

QPalette p( this->palette());
p.setColor( QPalette::Window, QColor(Qt::black));
this->setPalette(p);

QPalette p( this->palette());
p.setColor( QPalette::Window, QColor(Qt::black));
this->setPalette(p);

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now i need to check the window colour. if it is black i need 2 change it to gray and vice versa. i Tried to do as below but its not working

if(QMainWindow::backgroundRole() == Qt::black)
{
    QPalette p( this->palette());
   p.setColor( QPalette::Window, QColor(Qt::gray));
   this->setPalette(p);
}

if(QMainWindow::backgroundRole() == Qt::black)
{
    QPalette p( this->palette());
   p.setColor( QPalette::Window, QColor(Qt::gray));
   this->setPalette(p);
}

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But its not coming inside if loop.
Can any body help me.
thank you all.

[wysota]

Read what QWidget::backgroundRole does. It returns a role, not a colour.

[jpn]

QWidget::backroundRole() returns QPalette::ColorRole. It makes no sense to compare it to Qt::GlobalColor.

if (palette().color(Qt::Window) == Qt::black)
   ...

if (palette().color(Qt::Window) == Qt::black)
   ...

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[phillip_Qt]

I tried to do like following.

if(palette.color(QPalette::Window) == Qt::black)
{
    GrayColour();
}

if(palette.color(QPalette::Window) == Qt::black)
{
    GrayColour();
}

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still its not coming inside, but it showd come inside as the windows colour is black.

Then what to do Mr Wysota.? can u plz help me.

Thanks.

[wysota]

Have a boolean flag instead of checking the colour.

[phillip_Qt]

Have a boolean flag instead of checking the colour.

Thank for the Reply. Actually my requirment is if i run my programm the back grond colour of the system should change to gray including the IDE colour. But in my case only output window colour is getting changed.

Can u plz help me, how to do this.

[wysota]

You won't be able to change colours of other applications using Qt code.

[phillip_Qt]

You won't be able to change colours of other applications using Qt code.

Actully in MFC it can be done by using SetSysColor(). i need to know is there any replacment for this in Qt.

[wysota]

As I said, you won't be able to modify the behaviour of other applications using Qt code. SetSysColor() is not an MFC method, it's WinAPI function, so you can call it from Qt-based applications as well.

[phillip_Qt]

As I said, you won't be able to modify the behaviour of other applications using Qt code. SetSysColor() is not an MFC method, it's WinAPI function, so you can call it from Qt-based applications as well.

Can u plz tell me an example how to call Win32 API in Qt.

Thanx

[wysota]

Just call the function

[phillip_Qt]

I tried to call like

quint32 m_ColourElement = COLOR_3DDKSHADOW;
quint32 m_ColourNight = RGB(100, 100, 100);
SetSysColors(16, m_ColourElement, m_ColourDay);


But getting erors.

[wysota]

What kind of errors?

[jpn]

Can u plz tell me an example how to call Win32 API in Qt.

Qt is not a programming language but a library.

I tried to call like

quint32 m_ColourElement = COLOR_3DDKSHADOW;
quint32 m_ColourNight = RGB(100, 100, 100);
SetSysColors(16, m_ColourElement, m_ColourDay);


But getting erors.

Perhaps you should read SetSysColors() docs...