Dies ist ein Beispiel zur Implementierung einer gefälschten Titelleiste, die Standardschaltflächen (Minimieren, Maximieren, Schließen) enthält und zum Verschieben des gesamten Fensters gezogen werden kann (dies basiert auf dem Ansatz in @ Kevins Antwort) .
#include <QtWidgets>
class FakeTitleBar : public QWidget{
Q_OBJECT
public:
explicit FakeTitleBar(QWidget* parent= nullptr):QWidget(parent){
label.setSizePolicy(QSizePolicy::Expanding,
QSizePolicy::Expanding);
layout.addWidget(&label);
layout.addWidget(&buttonMinimize);
layout.addWidget(&buttonMaximize);
layout.addWidget(&buttonClose);
//connecting buttons' signals to slots
connect(&buttonMinimize, &QPushButton::clicked,
this, &FakeTitleBar::MinimizeWindow);
connect(&buttonMaximize, &QPushButton::clicked,
this, &FakeTitleBar::MaximizeWindow);
connect(&buttonClose, &QPushButton::clicked,
this, &FakeTitleBar::CloseWindow);
//setting vertical fixed size policy
//so that the title bar does not take up any additional space
setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
//a bit of styling
setStyleSheet("QPushButton {margin:0px; padding:5px;}"
"QWidget {background-color:blue; color:white;}");
}
public slots:
//slots for corresponding buttons
void MinimizeWindow(){
window()->showMinimized();
}
void MaximizeWindow(){
if(!window()->isMaximized())
window()->showMaximized();
else
window()->showNormal();
}
void CloseWindow(){
window()->close();
}
protected:
void mousePressEvent(QMouseEvent* event){
//save the press position (this is relative to the current widget)
pressPos= event->pos();
isMoving= true;
}
void mouseMoveEvent(QMouseEvent* event){
//isMoving flag makes sure that the drag and drop event originated
//from within the titlebar, because otherwise the window shouldn't be moved
if(isMoving){
//calculate difference between the press position and the new Mouse position
//(this is relative to the current widget)
QPoint diff= event->pos() - pressPos;
//move the window by diff
window()->move(window()->pos()+diff);
}
}
void mouseReleaseEvent(QMouseEvent* /*event*/){
//drag and drop operation end
isMoving= false;
}
//double-clicking on the title bar should maximize the window
void mouseDoubleClickEvent(QMouseEvent* /*event*/){
MaximizeWindow();
}
//in order for the style sheet to apply on this custom widget
//see https://doc.qt.io/qt-5/stylesheet-reference.html#qwidget-widget
void paintEvent(QPaintEvent *)
{
QStyleOption opt;
opt.init(this);
QPainter p(this);
style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this);
}
private:
QHBoxLayout layout{this};
QLabel label{"Fake Title Bar"};
QPushButton buttonMinimize{"-"};
QPushButton buttonMaximize{"M"};
QPushButton buttonClose{"X"};
QPoint pressPos;
bool isMoving{false};
};
//sample usage
class Widget : public QWidget{
public:
explicit Widget(QWidget* parent= nullptr):QWidget(parent){
setWindowFlags(Qt::CustomizeWindowHint);
layout.addWidget(&titleBar);
layout.addWidget(&label);
layout.setContentsMargins(0, 0, 0, 0);
label.setAlignment(Qt::AlignCenter);
//default size for the window
resize(320,240);
}
~Widget(){}
private:
QVBoxLayout layout{this};
FakeTitleBar titleBar;
QLabel label{"this is a sample window"};
};
int main(int argc, char* argv[]) {
QApplication app(argc, argv);
Widget w;
w.show();
return app.exec();
}
#include "main.moc"