qt - Design custom QT Widget on top of QT Window

Question

I have a QT main window and on top of this I want to add a widget ( containing buttons), as similar to image below. If I add a dock widget , it is added in separate row, but not added as overlay on existing main window. Any inputs ?

Answer 1

您应该考虑使用 QStackedLayout 来做到这一点。

Answer 2

最简单的方法是将覆盖小部件的父级设置为主窗口。但是因为它不会出现在任何布局中，所以您必须自己处理它的几何形状。如果您想要多个叠加层，最后添加的将是最顶部的。

#include <QApplication>
#include <QtGui>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QMainWindow *window = new QMainWindow();
    QWidget *centralWiddget = new QWidget();
    window->setCentralWidget(centralWiddget);

    QVBoxLayout *layout = new QVBoxLayout(centralWiddget);

    QPushButton *button = new QPushButton("Button in a layout");
    layout->addWidget(button);

    QPushButton *overlayButton = new QPushButton("Button overlay");
    overlayButton->setParent(window);
    overlayButton->setGeometry(40, 40, 120, 30)

    window->show();

    return app.exec();
}