Spacing between widgets in QHBoxLayout

Question

I'm trying to create a GUI with QtCreator. For this GUI, I need to display several images with different sizes next to each other. These images should be touching each other.

I use a QWidget with a QHBoxLayout, where I add the labels (with different sizes) containing the images.

According to related questions, I should use setSpacing and setContentsMargin to remove these spaces, but that won't work; I tried several times.

Here's the code:

QWidget *widget = new QWidget(ui->tagcloud);
QHBoxLayout * l = new QHBoxLayout(widget);
ui->tagcloud->setWidget(widget);

for(int i=0;i<list.size();++i)
{
    QLabel *lab = new QLabel;

    QPixmap pic((list[i].imgPath).c_str());      //This fetches the image
    int sizeChange = 50 + (2*list[i].percent);   //Calculates the size of the image

    lab->setFixedSize(QSize(sizeChange, sizeChange));
    lab->setPixmap(pic);
    lab->setScaledContents(true);

    l->addWidget(lab);
    l->setSpacing(0);

}

However, when I run this, the spacing remains the same (i.e. definitely not zero). If I add more labels to the layout, the spacing seems to get smaller.

Can anyone explain or help me? Thanks!

Answer 1

Setting spacing to 0 and adding stretch before and after works for me :

l->addStretch();
for(int i = 0; i < list.size(); ++i)
{
    QLabel *lab = new QLabel;

    QPixmap pic((list[i].imgPath).c_str());      //This fetches the image
    int sizeChange = 50 + (2*list[i].percent);   //Calculates the size of the image

    lab->setFixedSize(QSize(sizeChange, sizeChange));
    lab->setPixmap(pic);
    lab->setScaledContents(true);

    l->addWidget(lab);
}
l->addStretch();

l->setSpacing(0);

Also this works I think

l->setSizeConstraint(QLayout::SetMaximumSize);