Colored Buttons

[Walsi]

How can I give a Button another BackgroundColor??

I tried it with:

myButton->setPalette(QPalette(QColor(Qt::green)));

myButton->setPalette(QPalette(QColor(Qt::green)));

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But it doesn't work; I got following error at compiling the c-file:

error: expected primary-expression before '(' token.

error: expected primary-expression before '(' token.

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[marcel]

QPalette palette;
palette->setBrush( QPalette::Background, QBrush( Qt::green ) );
myButton->setPalette( palette );

QPalette palette;
palette->setBrush( QPalette::Background, QBrush( Qt::green ) );
myButton->setPalette( palette );

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Check out the color roles in QPalette.

Regards

[marcel]

Actually, you may have to use the role QPalette::Window, to change the button color.

[Walsi]

Actually, you may have to use the role QPalette::Window, to change the button color.

Please explain more detailed!

[Walsi]

QPalette palette;
palette->setBrush( QPalette::Background, QBrush( Qt::green ) );
myButton->setPalette( palette );

QPalette palette;
palette->setBrush( QPalette::Background, QBrush( Qt::green ) );
myButton->setPalette( palette );

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Check out the color roles in QPalette.

Regards

It doesn't work so, I got following error at compiling the c-fle:

error: base operand of '->' has non-pointer type 'QPalette'

error: base operand of '->' has non-pointer type 'QPalette'

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I got no errors when I replace '->' with '.'

Look:

QPalette greenPalette;
greenPalette.setBrush(QPalette::Background, QBrush(Qt::green));
destroyButton->setPalette(greenPalette);

QPalette greenPalette;
greenPalette.setBrush(QPalette::Background, QBrush(Qt::green));
destroyButton->setPalette(greenPalette);

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But the Button is still gray?

[marcel]

Use QPalette::Window, instead of Background.

[Walsi]

Button is still gray!

[marcel]

palette->setColor( QPalette::Window, Qt::green );

Regards

[Walsi]

"." instead of "->"

because with the "->" I got a compiling error!

[marcel]

Sure, I forgot you don't have a palette pointer

[Walsi]

but the button is still gray!

[Walsi]

arrrr it is green!!!

I even dont know what my mistake was!!

How can i use colors which are net predefined??

Is it possible to enter anywhere a RGB code???

Or something else?

Best Regards, and thx

[TheRonin]

Actually, you may have to use the role QPalette::Window, to change the button color.

i'm having trouble changing the background color of the pushbutton, regardless of the chosen role. The only way i've been able to change it is by manipulating the styleSheet. Could you perhaps post some compilable example code where you alter the button's background color?

Edit: I take that back, using QPalette::Button worked like a charm.

QPalette palette = button->palette();
palette.setColor(QPalette::Button, Qt::red);
button->setPalette(palette);

QPalette palette = button->palette();
palette.setColor(QPalette::Button, Qt::red);
button->setPalette(palette);

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[marcel]

Yes, you can construct a custom color with QColor( R, G, B ).
Look at QColor.

Regards

[Walsi]

i'm having trouble changing the background color of the pushbutton, regardless of the chosen role. The only way i've been able to change it is by manipulating the styleSheet. Could you perhaps post some compilable example code where you alter the button's background color?

That are the lines I inserted to change the butons color:

#include <QPalette>
QPalette greenPalette;
greenPalette.setColor(QPalette::Window, Qt::green);
destroyButton->setPalette(QPalette(QColor(Qt::green)));

#include <QPalette>
QPalette greenPalette;
greenPalette.setColor(QPalette::Window, Qt::green);
destroyButton->setPalette(QPalette(QColor(Qt::green)));

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Don't ask about the name of the Button

Best Regards,

[Walsi]

Yes, you can construct a custom color with QColor( R, G, B ).
Look at QColor.

Regards

Another basic question from me: Is a QPushButton able to blink??

For example: gray --> green --> gray --> green

Best Regards!

[marcel]

Yes, if you use a QTimer, with let's say a 200ms delay. In the timerEvent slot you just switch the color from gray to green and then back.

Regards

[jpn]

A few notes:

It is a good practice to get the palette from a widget, modify it, and set it back. Constructing a new palette object makes it use application's default palette which means losing any possible previous modifications to widget's palette:

QPalette palette = widget->palette();
palette.setColor(...);
widget->setPalette(palette);

QPalette palette = widget->palette();
palette.setColor(...);
widget->setPalette(palette);

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For a button, the correct color group is QPalette::Button:

QPalette palette = button->palette();
palette.setColor(QPalette::Button, Qt::green);
button->setPalette(palette);

QPalette palette = button->palette();
palette.setColor(QPalette::Button, Qt::green);
button->setPalette(palette);

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QWindowsXpStyle and QMacStyle use native theming engines which cause some palette modifications not to have any effect. Certain colors/brushes/whatever come from the underlying system. Style sheets is the solution to this problem. Follow the link and see the example of changing QPushButton's color there.

[Walsi]

I got a runtime exception: Segmentation fault!

[Walsi]

Now I tried a solution which causes no error and which seems to be working.

My code is looking like that:

I generate my own color out from a RGB code (also with alpha Parameter)

QColor myColor;
mycolor.setRgb(0, 150, 0, 255);
 
...
...
...
 
myButton->setPalette(QPalette(Qcolor(myColor)));

QColor myColor;
mycolor.setRgb(0, 150, 0, 255);

...
...
...

myButton->setPalette(QPalette(Qcolor(myColor)));

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It works fine!

Best Regards,...