Check-in [de930bf6ec]

{"tip": {

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	"551":{"url":"./tip/551.md","keywords":"numbers, readability","":"","state":"Draft","type":"Project","author":["Eric Taylor <[email protected]>"],"created":"16-Sep-2019","title":"# TIP 551: Permit underscore in numerical literals in source code","sponsor":"Brian Griffin <[email protected]>","post-history":"","vote":"Pending","tcl-version":"8.7","char c = len ? *p ":"'\\0';","is-jest":false},
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<th>Type</th>
<th>Tcl Version</th>
<th>Status</th>
<th>Title</th>
<th>Impl.</th>
</tr></thead><tbody>









<tr class='state-draft type-project version-87'>
<td valign='top'><a href='./tip/551.md'>551</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Draft</td>
<td valign='top' ><a href='./tip/551.md'>Permit underscore in numerical literals in source code</a></td>
<td></td>

<th>Type</th>
<th>Tcl Version</th>
<th>Status</th>
<th>Title</th>
<th>Impl.</th>
</tr></thead><tbody>

<tr class='state-draft type-project version-87'>
<td valign='top'><a href='./tip/552.md'>552</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Draft</td>
<td valign='top' ><a href='./tip/552.md'>Extended treeview functionality.</a></td>
<td valign='top'><a href='/tk/timeline?r=pspjuth-treeview'>Link</a></td>
</tr>
<tr class='state-draft type-project version-87'>
<td valign='top'><a href='./tip/551.md'>551</a></td>
<td valign='top'>Project</td>
<td valign='top'>8.7</td>
<td valign='top'>Draft</td>
<td valign='top' ><a href='./tip/551.md'>Permit underscore in numerical literals in source code</a></td>
<td></td>

# TIP 552: Extended treeview functionality.
        Author:        Peter Spjuth <[email protected]>
        State:         Draft
        Type:          Project
        Vote:          Pending
        Created:       19-Sep-2019
        Post-History:
        Tcl-Version:   8.7
        Keywords:      Tk, treeview
        Tk-Branch:     pspjuth-treeview
-----

# Abstract

This TIP proposes a set of new features for the Ttk treeview widget.

# Rationale

TBW

# Specification

The following features are added to the treeview widget.

## Locked horizontal scrolling

Adds the ability to lock the first column(s) from horizontal scrolling.

A new option **-titlecolumns** *n* is added, requesting columns to be locked.

## Cell selection

Adds the ability to select individual cells as well as full rows.

Cell selection is independent of item selection.

Cells are identified with a two element list with item id and column id.

A new subcommand **cellselection** is added, mirroring the present **selection**.
In addition the **cellselection set** command gets a version for selecting a
rectangular range.

A new option **-selecttype** *type* is added to direct default bindings to
use either item selection or cell selection.

The **identify** subcommand is updated with the **cell** option.

Default bindings are updated to use these features.

## Striped rows

A new option **-striped** *bool* is added. This makes every other row get marked
with the `alternate` state, and allows the theme to draw them in a
different color. Built in themes are updated to put something fitting
at that color.

## Column separators

The **-show** option is extended with the value `columnseparators` to
display a separator between columns.
Built in themes are updated to define the separators.

# Implementation

Started on branch [`pspjuth-treeview`](https://core.tcl-lang.org/tk/timeline?r=pspjuth-treeview)

# Copyright

This document has been placed in the public domain.