[Interest] QTreeView::resizeColumnToContents not accurate enough

[Elvis Stansvik]

2017-02-02 11:23 GMT+01:00 Elvis Stansvik <elvstone at gmail.com>:
> WIth the following minimal example:
>
> #include <QApplication>
> #include <QTreeView>
> #include <QStandardItemModel>
> #include <QStandardItem>
>
> int main(int argc, char *argv[])
> {
>     QApplication app(argc, argv);
>
>     QStandardItemModel model(3, 2);
>     model.setHorizontalHeaderLabels({ "Header 1", "Header 2" });
>
>     for (int row = 0; row < 3; ++row) {
>         for (int column = 0; column < 2; ++column) {
>             model.setItem(row, column, new QStandardItem("Foo"));
>         }
>     }
>
>     QTreeView view;
>     view.setModel(&model);
>     view.show();
>     view.resizeColumnToContents(0);
>
>     return app.exec();
> }
>
> I get the attached result. Note how the first column does not snugly
> fit the contents. The limiting factor should be the width of the
> header ("Header 1"), but there's plenty of room left to shrink the
> column.
>
> Anyone else had this problem? Is there a way to improve the accuracy
> of QTreeView::resizeColumnToContents ?
>
> This is with Qt 5.5.1 (Ubuntu 16.04 package).

I wonder, considering the amount of extra space, could it be that the
calculation is taking the width of a sorting indicator (the ^ and v
arrows) into account, even if no such handle is visible (sorting is
not enabled)? If so, should that be considered a bug that I should
report?

Elvis

>
> Thanks in advance,
> Elvis