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I've read the documentation of Qt for resizing policy but I couldn't find how can I achieve the scenario of changing the image's size to fit the new size of Qlabel.

This is my GUI structure 

mainLayout:
    toplayout:
        QLabel
        QPushButton

Now I have cv::Mat image. I have converted to QPixmap.

Window::Window(QWidget *parent): QDialog(parent)
{
    // Widgets
    browserButton = new QPushButton(tr("Open"));
       imageLabel = new QLabel;

    imageLabel->setAlignment(Qt::AlignHCenter);
    imageLabel->setScaledContents(true);


    // Connect Actions
    connect(browserButton, SIGNAL(clicked()), this, SLOT(browserClicked()));

    // Layouts
    QVBoxLayout *topLayout = new QVBoxLayout;
    topLayout->addWidget(imageLabel);
    topLayout->addWidget(browserButton);

    // Main Layout
    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addLayout(topLayout);
    setLayout(mainLayout);
    setWindowTitle("Image Browser");
}

This is the button 

void Window::browserClicked()
{
    // Get file name as QString 
    QString fileName = QFileDialog::getOpenFileName(this,
                                                    tr("Open Image"),
                                                    NULL,
                                                    tr("Image Files (*.png *.jpeg *.jpg *.bmp)"));

    // Read file name as String not QString and store the image           
    m_original_CVimg = cv::imread(fileName.toStdString());

    imageLabel->setPixmap(this->cvMatToQPixmap(m_original_CVimg));

}

I want to resize the image's size every time the user changes the size of the window. If I expand the window, the image also is expanded but the problem if I shrink the window, the size of the window is restricted to the size of the image. Any suggestions

4

1 回答 1

1

看看QResizeEvent。

于 2014-07-14T21:35:58.700 回答