如何在Qt中使用图像背景Widget视图获取用户输入？

QWidget* mainWidget = new QWidget;
QPixmap background(":/path/to/image.jpg");
QPalette palette;
palette.setBrush(mainWidget->backgroundRole(), background);
mainWidget->setPalette(palette);
mainWidget->setAutoFillBackground(true);

QLineEdit* inputLineEdit = new QLineEdit;
QPushButton* submitButton = new QPushButton("Submit");

QVBoxLayout* layout = new QVBoxLayout;
layout->addWidget(inputLineEdit);
layout->addWidget(submitButton);

mainWidget->setLayout(layout);

QMainWindow* mainWindow = new QMainWindow;
mainWindow->setCentralWidget(mainWidget);

mainWindow->show();