TreeList Column Header, Word Wrap, Auto Height?

When the column header gets wrapped on to multiple lines does the number of lines or the height get reported somehow, i.e. can I read what the treeview column has done with the word wrapping?

Hi,

If your task is to calculate a column header height, you can do this by using the AppearanceObject.CalcTextSize method. You can review the How to enable the auto height feature for the column header panel, so the column header captions are shown in their entirety example where we described how to automatically adjust a column header height in a grid.

I hope that this information will help you resolve the issue.

Will that work for a TreeList too?

Yes, you can use the same approach. I have slightly modified the How to enable the auto height feature for the column header panel, so the column header captions are shown in their entirety example and attached it to John's answer.

I have had a look at the project supplied but it does not actually quite work right. The word 'Header' is missing?

Here is the fix to this problem, James:

private Size CalcCaptionTextSize(GraphicsCache cache, HeaderObjectInfoArgs ee, string caption) {
            Size captionSize = ee.Appearance.CalcTextSize(cache, caption, ee.CaptionRect.Width).ToSize();
            Skin skin = GridSkins.GetSkin(treeList.LookAndFeel);
            SkinPaddingEdges edges = skin[GridSkins.SkinHeader].ContentMargins;
            captionSize.Height += edges.Top + edges.Bottom;
            captionSize.Width++;
            return captionSize;
        }

The Plato that fixed it.

Actually there is some weird behaviour on this column header thing. If a column is resized within the viewable area of the tree list the height calculation miss-calculates for columns further along that are not in the current view but are still marked as Visible=true.

The TreeListViewInfo returns different dimentions depending on if the column header is in the current view or not. The x,y are 0,0 and the width is a difference of -5 when not in current view.

Hi James,

No, TreeList doesn't take into calculation columns that are not currently visible. That's why TreeListViewInfo returns empty bounds for them.

Thanks,
Vlad R

The columns are marked visible just not in the current view because there are a lot of columns. I think the strange values I was seeing may be something to do with setting the VisibleIndex. I took the width of the column before setting VisibleIndex and then wrote back to the column width and it seems fine again. I think setting VisibleIndex breaks the column size properties.

James;
We will examine this behavior in detail and let you know what exactly causes this incorrect calculation. Please wait a bit.