[Interest] QTreeView, QHeaderview, ResizeToContents and Interactive

[Alexander Semke]

On Freitag, 17. März 2017 09:18:58 CET Etienne Sandré-Chardonnal wrote:
> Sorry, I wrote too fast
> The proper way to get the column width ist tableView->sizeHintForColumn(i)
> So just do
> 
> for(int i=0;i<header->count();++i)
>     header->resizeSection(i, qMax(header->sectionSizeHint(i),
> tableView->sizeHintForColumn(i)));
It's QTreeView in my case, not QTableView, but anyway. sizeHintForColumn is 
protected. Your example should be equivalent to my 
	for (int i = 0; i<m_treeView->header()->count(); ++i)
		m_treeView->resizeColumnToContents(i);

which I already tried. This only resizes one of the columns properly
http://imgur.com/a/klXS8


> When Qt manages to do something with a built in function, but you can't do
> it manually, the best way is to look into Qt code to understand how it's
> done internally. Qt source is a very good way to find answers...
Yes, that's true. I checked already the source code and I just don't see at 
the moment what I'm doing wrong here. What I don't understand neither is that 
when doing
		m_treeView->resizeColumnToContents(0);

right after I set my model via m_treeView->setModel(my_model); like in the 
loop above, the first column is not resized properly. But when I call this 
later when the user adds new objects to the data model and I want to adjust 
the first column to the new name, the first columnt with the object names is 
adjusted as expected:
http://imgur.com/a/JRI4z 

Here, Worksheet1 was added and there is a 
	m_treeView->resizeColumnToContents(0);

again in the corresponding slot that handles newly added objects. 

This must be something trivial that I'm missing at the moment. I just don't 
see it and it blocks the next release of LabPlot at the moment :-(


-- 
Alexander