How to get status of QScrollBar ？

[sonichy]

I am writing a image viewer.
When need scrollbar Key_Left and Key_Right move horizontal scrollbar.
When do not need scrollbar Key_Left and Key_Right run lastImage and nextImage.

connect(new QShortcut(QKeySequence(Qt::Key_Left),this), SIGNAL(activated()),this, SLOT(lastImage()));

void MainWindow::lastImage()
{
    if ( !ui->scrollArea->horizontalScrollBar()->isNeeded && ui->scrollArea->verticalScrollBar()->isNeeded() ) { // How to write here ?
        int id = index - 1;
        if (id > -1) {
            path = fileInfoList.at(id).absoluteFilePath();
            loadImage(path);
            index = id;
        }
    }else{
        ui->scrollArea->horizontalScrollBar()->setValue(ui->scrollArea->horizontalScrollBar()->value() - 20);
    }
}

[SGaist]

Hi,

What should be the logic behind isNeeded ?

[sonichy]

Solved !

if (ui->scrollArea->horizontalScrollBar()->visibleRegion().isEmpty()) {
    ...
}