QScrollArea Image Loading

Thanasis

Hello, everybody,

I am trying to modify the "scribble" Qt example and load an image inside a QWidget and add scrollbars if the image is larger than the Main Window.

I have these two classes:

class MainWindow: public QMainWindow
class ImageViewer: public QWidget

Inside the constructor of the MainWindow, I have added the following code.

QScrollArea *scroll_area_ = new QScrollArea();
main_area_ = new ImageViewer(scroll_area_);
QHBoxLayout *mainLayout = new QHBoxLayout();
QTextEdit *te = new QTextEdit("1234"); // Added also a text box just for testing
mainLayout->addWidget(main_area_);
mainLayout->addWidget(te);
scroll_area_->setWidgetResizable(true);
scroll_area_->setWidget(main_area_);
scroll_area_->setLayout(mainLayout);
setCentralWidget(scroll_area_);
setWindowTitle(tr("Show Image"));

and in my main I have added the following code:

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MainWindow window;
    window.show();
    return app.exec();
}

My problem is that the widgets are being loaded one behind the other and when I am loading a large image file the scrollbars do not appear.

Do you have any ideas what I am doing wrong.?

Thank you in advance for your help.
Thanasis

SGaist

Hi and welcome to devnet,

You are setting a layout and a widget on your scroll_area which is wrong. From your description, you should rather have your ImageViewer as widget of the QScrollArea and then the QScrollArea in a layout on top your QTextEdit.