Qt C ++以旧窗口为中心显示新窗口

Question

I have QWidget with button. When button is pressed, show new smaller window (Qwidget too). I want then new window is centered horizontal and veritcal on main window. Code which display new window is:

QWidget *wdg = new QWidget;
QPushButton *closeBtn = new QPushButton("Close");
QHBoxLayout *layout = new QHBoxLayout;
layout->addWidget(closeBtn);
wdg->setLayout(layout);
wdg->show();
wdg->resize(400,200);

Answer 1

Use the move slot. For example:

QPoint centerPoint = oldWidget->geometry()->center();

newWidget->adjustSize();
newWidget->move(centerPoint.x() - newWidget->width()/2, centerPoint.y() - newWidget->height()/2);

You may consider using frameGeometry() instead of geometry() .

http://qt-project.org/doc/qt-5/application-windows.html#window-geometry

Hope that helps.