How do I draw the close, minimize, and maximize buttons in Qt? - c++

Question

I created a this->setWindowFlags(Qt::FramelessWindowHint); and so there is no title bar. Therefore, I am implementing my own. I wanted to know, however, before I continue whether there is a standard way to add the close, minimize, and maximize buttons in a native-os looking way (i.e. on windows it should look like the windows close buttons and the same for osx and linux).

Answer 1

QStyle take a lot of standard icons base on OS style. You can get this icon from current OS style and then draw it by your self.
This is a simple implementation for reference.
class TitleBar : public QWidget
{
Q_OBJECT
public:
explicit TitleBar(QWidget *parent = 0)
:QWidget(parent)
{
QStyle *style = qApp->style();
QIcon closeIcon = style->standardIcon(QStyle::SP_TitleBarCloseButton);
QIcon maxIcon = style->standardIcon(QStyle::SP_TitleBarMaxButton);
QIcon minIcon = style->standardIcon(QStyle::SP_TitleBarMinButton);
QPushButton *min = new QPushButton(this);
QPushButton *max = new QPushButton(this);
QPushButton *close = new QPushButton(this);
min->setIcon(minIcon);
max->setIcon(maxIcon);
close->setIcon(closeIcon);
QHBoxLayout *layout = new QHBoxLayout(this);
layout->setSpacing(0);
layout->addWidget(min);
layout->addWidget(max);
layout->addWidget(close);
setLayout(layout);
}
};