Today I was trying to take a picture of the QSlider handle in order to use it in an adpated QSlider widget with two handles.
This is somewhat similar to the following question: Range slider in Qt (two handles in a QSlider)
For a full fledged solution I can not use a simple image files. I tried to create the image of the QSlider by using the drawComplexControl function, but it leaves me basically with a black image.
What I'm doing wrong here? It seems so simple to me, but it is just not working.
#include <QApplication>
#include <QPushButton>
#include <QPainter>
#include <QStyleOptionSlider>
int main(int argc, char** args) {
QApplication app(argc, args);
auto slider = new QSlider;
slider->setOrientation(Qt::Orientation::Horizontal);
slider->show();
auto btn = new QPushButton("Create Image");
QObject::connect(btn, &QPushButton::clicked, [&] {
auto style = QApplication::style();
QStyleOptionSlider sliderOptions;
QPixmap pix(slider->size());
auto painter = new QPainter();
painter->begin(&pix);
style->drawComplexControl(QStyle::CC_Slider, &sliderOptions, painter, slider);
pix.save("SliderImage.png");
auto handleRect = style->subControlRect(QStyle::ComplexControl::CC_Slider, &sliderOptions, QStyle::SubControl::SC_SliderHandle, slider);
QPixmap handlePix = pix.copy(handleRect);
handlePix.save("SliderHandleImage.png");
painter->end();
});
btn->show();
app.exec();
}