[Interest] new TableView columns hiding

[Vlad Stelmahovsky]

Hi all

investigating new TableView, added to 5.12 and have a question: is it
possible to hide some columns dynamically w/o modify model?

bruteforce way to set column width to 0 doesnt works, because its
checking width and force set it to some minimal value (have no idea, why)


br,

Vlad

[Shawn Rutledge]

Post by Vlad Stelmahovsky
Hi all
investigating new TableView, added to 5.12 and have a question: is it possible to hide some columns dynamically w/o modify model?
bruteforce way to set column width to 0 doesnt works, because its checking width and force set it to some minimal value (have no idea, why)

Why: because the layout algorithm could have a bad edge case if some columns are zero-width. (It keeps trying to fill the width of the view, but maybe it will never get there?)

I ran into that while preparing for my QtWS talk about TableView. But I needed to subclass QSortFilterProxyModel anyway, to have sorting and filtering; so it was also not too hard to change the columns there by overriding mapFromSource and mapToSource. You could think of your QSortFilterProxyModel subclass as a “view model”, and use it do whatever corrections you need to make to the original model to make it presentable. At least that’s what I came up with for now.

https://github.com/ec1oud/qps/blob/unsquashed/qtquick/sortfilterprocessmodel.cpp

[Christian Ehrlicher]

Post by Vlad Stelmahovsky
ue (have no idea, why)
Why: because the layout algorithm could have a bad edge case if some columns are zero-width. (It keeps trying to fill the width of the view, but maybe it will never get there?)

You not talk about QHeaderView but I think the codebase may be derived
from it:

void QHeaderView::resizeSection(int /logicalIndex/, int /size/)
Resizes the section specified by /logicalIndex/ to /size/ measured in
pixels. The size parameter must be a value larger or equal to zero. A
size equal to zero is however not recommended. In that situation
hideSection <http://doc.qt.io/qt-5/qheaderview.html#hideSection> should
be used instead.


Christian

[Vlad Stelmahovsky]

just to clarify, its about QML's TableView, not widget's QTableView

Post by Christian Ehrlicher

Post by Vlad Stelmahovsky
ue (have no idea, why)
Why: because the layout algorithm could have a bad edge case if some columns are zero-width. (It keeps trying to fill the width of the view, but maybe it will never get there?)

You not talk about QHeaderView but I think the codebase may be derived
void QHeaderView::resizeSection(int /logicalIndex/, int /size/)
Resizes the section specified by /logicalIndex/ to /size/ measured in
pixels. The size parameter must be a value larger or equal to zero. A
size equal to zero is however not recommended. In that situation
hideSection <http://doc.qt.io/qt-5/qheaderview.html#hideSection>
should be used instead.
Christian
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