wxWidgets: wxListCtrl column width

[IWishIKnew]

I'm learning the wxWidgets GUI library, and I'm having trouble getting the wxListCtrl column width adjusted correctly.

-1 is automatically sized, and according to the documentation, it's supposed to size the column = to the largest element in the list control. That's not happening though. The list control has the following styles: wxLC_VRULES, wxLC_SINGLE_SEL, wxLC_NO_HEADER, wxLC_VIRTUAL, wxLC_REPORT. Minimum size: 200, 175. I dynamically update the size of the list according to the number of elements in a vector so that when the control requests an element it's within a valid range (i.e.: it doesn't crash the program).

Am I doing somthing wrong here? Is there a correct way to size the column? Am I missing somthing?

If any other information is needed, don't hesitate to ask for it.

Thanks for the help.

[coder777]

The adjustment doesn't happen each time you insert an item. It happens when you explicitely call SetColumnWidth(...). Plus there is a difference between wxLIST_AUTOSIZE and wxLIST_AUTOSIZE_USEHEADER.

I made this function:

  void ListCtrl::AutoSizeHeader(wxListCtrl *const list_ctrl)
  {
    if(list_ctrl)
    {
      for(int i = 0; i < list_ctrl->GetColumnCount(); ++i)
      {
        list_ctrl->SetColumnWidth(i, wxLIST_AUTOSIZE);
        const int a_width = list_ctrl->GetColumnWidth(i);
        list_ctrl->SetColumnWidth(i, wxLIST_AUTOSIZE_USEHEADER);
        const int h_width = list_ctrl->GetColumnWidth(i);
        list_ctrl->SetColumnWidth(i, (std::max)(a_width, h_width));
      }
    }
  }

in order to adjust the column size. It is called after the wxListCtrl is completely filled.

[IWishIKnew]

This is a virtual list, so the list can't be completely filled... Items are added on request.

[coder777]

You can do that after each request / for each column. The reason why it is not done automatically is that it would flicker if you do that for like 1000 elements in a loop.