Check-in [de930bf6ec]

{"tip": {
	"552":{"url":"./tip/552.md","keywords":"Tk, treeview","created":"19-Sep-2019","post-history":"","state":"Draft","tk-branch":"pspjuth-treeview","tcl-version":"8.7","vote":"Pending","type":"Project","title":"# TIP 552: Extended treeview functionality.","author":["Peter Spjuth <[email protected]>"],"is-jest":false},
	"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},
	"550":{"url":"./tip/550.md","keywords":"Tcl, memory","created":"11-Jun-2019","post-history":"","state":"Draft","tcl-version":"9.0","vote":"Pending","type":"Project","title":"# TIP 550: Garbage Collection for TclOO","author":["Donal K. Fellows <[email protected]>"],"is-jest":false},
	"549":{"url":"./tip/549.md","keywords":"Tcl","created":"7-June-2019","post-history":"","state":"Draft","tcl-branch":"tip-549","tcl-version":"8.7","vote":"Pending","type":"Project","title":"# TIP 549: Make configure --enable-64bit the default","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","Jan Nijtmans <[email protected]>"],"is-jest":false},
	"548":{"url":"./tip/548.md","keywords":"Tcl","state":"Final","type":"Project","author":["Jan Nijtmans <[email protected]>","Jan Nijtmans <[email protected]>"],"votes-against":"none","votes-for":"JN, DKF, KW, KBK","vote-results":"4/2/0 accepted","created":"3-June-2019","title":"# TIP 548:Support `wchar_t` conversion functions and deprecate `Tcl_WinUtfToTChar()` and `Tcl_WinTCharToUtf()`","post-history":"","vote":"Done","tcl-version":"8.7","tcl-branch":"tip-548","votes-present":"DGP, SL","discussions-to":"Tcl Core list","is-jest":false},
	"547":{"url":"./tip/547.md","keywords":"Tcl","created":"31-May-2019","post-history":"","state":"Final","tcl-branch":"tip-547","tcl-version":"8.7","vote":"Done","type":"Project","title":"# TIP 547: New encodings: UTF-16, UCS-2","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","Jan Nijtmans <[email protected]>"],"is-jest":false},
	"546":{"url":"./tip/546.md","keywords":"Tcl, traces","created":"20-May-2019","post-history":"","state":"Draft","vote":"Pending","tcl-version":"8.7","type":"Project","title":"# TIP 546: Typedefs to Support Source-Compatible Migration","author":["Don Porter <[email protected]>"],"is-jest":false},
	"545":{"url":"./tip/545.md","keywords":"Tk, image","state":"Final","type":"Project","tk-branch":"tip-545-svg-options","author":["Harald Oehlmann <[email protected]>"],"vote-results":"6/0/0 accepted","votes-for":"BG, DKF, FV, KW, JN, MC","votes-against":"none","created":"19-May-2019","title":"# TIP 545: image photo SVG options: remove -unit and add target height/width option","vote":"Done","tcl-version":"8.7","votes-present":"none","is-jest":false},
	"544":{"url":"./tip/544.md","keywords":"Tcl","created":"15-May-2019","post-history":"","state":"Final","tcl-branch":"tip-544","vote":"Done","tcl-version":"8.7","type":"Project","title":"# TIP 544: Export TclGetIntForIndex()","discussions-to":"Tcl Core list","author":["Jan Nijtmans <[email protected]>","François Vogel <[email protected]>"],"is-jest":false},

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	"1":{"url":"./tip/1.md","created":"14-Sep-2000","obsoleted-by":"386","post-history":"","state":"Withdrawn","vote":"No voting","type":"Informational","title":"# TIP 1: TIP Index","author":["TIP Editor <[email protected]>"],"is-jest":false},
	"0":{"url":"./tip/0.md","created":"11-Dec-2000","post-history":"","state":"Final","vote":"Done","type":"Process","title":"# TIP 0: Tcl Core Team Basic Rules","author":["John Ousterhout <[email protected]>"],"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/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.