Background color animation

[cszawisza]

Hi!

I want to animate changing of background color in a window using QPropertyAnimation

QPalette start;
    start.setColor(QPalette::Window, QColor(1,255,0));
 
    QPalette stop;
    stop.setColor(QPalette::Window, QColor(255,255,255));
    animation = new QPropertyAnimation(this, "palette");
    animation->setDuration(100);
    animation->setStartValue(start);
    animation->setEndValue(stop);
    animation->setLoopCount(-1);
    animation->start();

QPalette start;
    start.setColor(QPalette::Window, QColor(1,255,0));

    QPalette stop;
    stop.setColor(QPalette::Window, QColor(255,255,255));
    animation = new QPropertyAnimation(this, "palette");
    animation->setDuration(100);
    animation->setStartValue(start);
    animation->setEndValue(stop);
    animation->setLoopCount(-1);
    animation->start();

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But after "starting" the animation nothing happen...
Is there a way to change the background color of window by simple calling some property? (Without overloading or creating own properties by Q_PROPERTY)

[anda_skoa]

Did you call setAutoFillBackground(true) on the widget?

Cheers,
_

[cszawisza]

Yes, I add that line, without any good result

ui->setupUi(this);
this->setAutoFillBackground(true);
QPalette start, stop;
 
start.setColor(QPalette::Window, QColor(0,255,0));
stop.setColor(QPalette::Window, QColor(255,0,0));
animation = new QPropertyAnimation(this, "palette");
animation->setDuration(100);
animation->setStartValue(start);
animation->setEndValue(stop);
animation->setLoopCount(-1);
 
connect(ui->pushButton, &QPushButton::clicked,
        [&](){
    qDebug() << "Animation button clicked";
    animation->start();
});

ui->setupUi(this);
this->setAutoFillBackground(true);
QPalette start, stop;

start.setColor(QPalette::Window, QColor(0,255,0));
stop.setColor(QPalette::Window, QColor(255,0,0));
animation = new QPropertyAnimation(this, "palette");
animation->setDuration(100);
animation->setStartValue(start);
animation->setEndValue(stop);
animation->setLoopCount(-1);

connect(ui->pushButton, &QPushButton::clicked,
        [&](){
    qDebug() << "Animation button clicked";
    animation->start();
});

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This is the whole "app" that I was testing animations on... (standard new mainwindow project from qtcreator with pushbutton)
some further suggestions?

[cszawisza]

One thing that worked was to add own "color" property to widget.

[anda_skoa]

The problem could be that QPropertyAnimation does not know how to interpolate between QPalette values since a QPalette is quite a complex object with lots of sub values.

Cheers,
_