QTreeWidget won't scroll horizontally

[JimDaniel]

Hi, this has really been bugging me.

I have a QTreeWidget in a QVBoxLayout and that layout is set to a QGroupBox. For whatever reason, the treeview doesn't recognize when it needs to scroll horizontally, and if I manually call setHorizontalScrollPolicy(Qt::ScrollBarAlwaysOn); the scroll bar is visible, but there is no bar to scroll. The strangest part is that the vertical scroll works just fine.

Here is some of my code...I didn't put the code where I populate the treeview as its long and to my mind irrelevant.

treeWidget = new QTreeWidget();
treeWidget->setColumnCount(1);
 
verticalLayout = new QVBoxLayout();
verticalLayout->addWidget(treeWidget);
 
groupBox->setLayout(verticalLayout);

treeWidget = new QTreeWidget();
treeWidget->setColumnCount(1);

verticalLayout = new QVBoxLayout();
verticalLayout->addWidget(treeWidget);

groupBox->setLayout(verticalLayout);

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I've tried populating the treeview both before its set to the layout and after. No change.

Does anyone have any ideas? Seems like it should work...

[jpn]

You would have to turn the stretching off:

treeWidget->header()->setStretchLastSection(false);

treeWidget->header()->setStretchLastSection(false);

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Notice that QHeaderView provides several methods for handling section resizing.

[JimDaniel]

Thanks alot. I didn't see your post and finally got it to work by calling treeWidget->resizeColumnToContents(0) each time a node was expanded. Your method seems much cleaner.

[pravin.chaudhary]

Thanks, even I was facing this problem.

in addition, I had to write following line

header()->setResizeMode(QHeaderView::ResizeToContents);

header()->setResizeMode(QHeaderView::ResizeToContents);

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