Add support for columns and column titles to ItemList

[ShlomiRex]

Describe the project you are working on

I am working on improving the file dialog (when selecting files, opening, and more).

In the list view of the directories and files, you currently see only the names of the directories and files.

I'm working on GUI change so the ItemList will also have columns & titles. The file dialog will have 3 columns:

Name (of dir/file), Size (in bytes / kb / mb / gb), Last modified

In addition user will be able to click on the columns to sort by that category.

Describe the problem or limitation you are having in your project

There is no functionality in ItemList (a GUI component) to set column titles.

I want to create an ItemList with 3 columns and have their titles visible.

Tree GUI componenet however, does have this functionality.

Describe the feature / enhancement and how it helps to overcome the problem or limitation

There is some column code (properties) inside ItemList but no implementation of rendering columns.

There is only column count, max column count and thats it.

Describe how your proposal will work, with code, pseudo-code, mock-ups, and/or diagrams

Using the ItemList column functions, I would be able to implement better file dialog.

If this enhancement will not be used often, can it be worked around with a few lines of script?

It will be used often, each time a user selects a file/directory from file dialog.

Is there a reason why this should be core and not an add-on in the asset library?

As mention above this is code functionality of ItemList

[bluenote10]

Considering that ItemList already suffers a bit from feature creep, it may be worth considering such functionality in a dedicated component. Supporting columns properly essentially means turning the ItemList into a table, which could require many more features than a plain item list (sorting, filtering, column ordering, column enabling/disabling, pagination, horizontal scrolling, ...).

So possibly related to #1107 #97 #13

[dalexeev]

You can use Tree instead of ItemList.