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From: Mark Summerfield <m.n.summerfield@gmail.com>
Newsgroups: comp.lang.tcl
Subject: how to style one particular treeview
Date: Thu, 17 Jul 2025 07:36:19 -0000 (UTC)
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I am using one particular ttk::treeview as a listbox:

    ttk::frame .ignoresForm.ignoresListFrame
    set ignoresList [ttk::treeview \
        .ignoresForm.ignoresListFrame.ignoresList -striped true \
        -yscrollcommand {.ignoresForm.ignoresListFrame.scrolly set}]
    ttk::style configure List.Treeview -indent 0
    #ttk::style map List.Treeview -indent [list disabled 0 active 0]
    $ignoresList configure -show tree -selectmode browse \
        -style List.Treeview
    $ignoresList column #0 -anchor w -stretch true
    ttk::scrollbar .ignoresForm.ignoresListFrame.scrolly -orient vertical \
        -command {.ignoresForm.ignoresListFrame.ignoresList yview}

By default a ttk::treeview has an -indent of 20 pixels which makes sense
for trees but is not needed for lists.

In the code above I've tried to create a custom style to apply to one
treeview but it has no effect whether I use ttk::style configure or 
ttk::style map.

What is the correct way to do this?