Re: [Tile-dev] Strawman Tree widget API

[Joe E. <jen...@fl...>]

Not mentioned explicitly (but sort of implied by the separate
'itemconfigure' and 'itemcget' commands), the 3-argument form:

    $tree itemconfigure $item

returns a list of 5/2-tuples just like widget 'configure' commands do.

It occurred to me that this is completely unnecessary;
[$tree itemconfigure] should return a simple dictionary
of -option/value pairs, just like [font configure] does.
The 4-argument form can replace [$tree itemcget].
Further, the names can be shortened to just the noun part
"item" and "column":

    $tree item $item ?-option ?-value ?-option value...???
    $tree column $column ...

are generalized data accessors for item and column attributes.

This is a clear win.  I'm going to introduce a

	* * * POTENTIAL INCOMPATIBILITY * * *

and replace [$notebook tabconfigure] / [$notebook tabcget]
with [$notebook tab], using the same pattern.

Further simplifications: "-open" can be an item option, (I keep
flip-flopping between "open" and "expand[ed]") removing the
need for [$tree open/expand], [$tree close/collapse] and [$tree
opened/expanded].  This is another win: three fewer commands,
and users can set the open/closed state at item creation time.

Plus, I can dump several screensful of boilerplate code.
This makes me happy :-)


--Joe English

  jen...@fl...