Table widget support

[dockimbel]

Backends capabilities

Feature	Win32	GTK3	macOS
Unlimited rows	✔️	?	?
Unlimited columns	?	?	?
Settable column size	✔️	✔️	?
User-resizable columns	✔️	✔️	?
Fixed column size	✔️	✔️	?
Auto-sizeable column to minimum/optimum width	✔️	✔️	?
Column overflow selection button	✔️	?	?
Column content left/center/right alignment	✔️	✔️	?
Clickable column headers	✔️	✔️	?
Columns optional drag-and-drop reordering	✔️	✔️	?
Settable column header background color	❌²	✔️	?
Settable column header text color	❌²	✔️	?
Settable global background color	✔️	✔️	?
Settable global text color	✔️	✔️	?
Settable global font	✔️	✔️	?
Settable item's background color	❌ ¹	✔️	?
Settable item's text color	❌ ¹	✔️	?
Settable item's font	❌ ¹	✔️	?
Settable item's text alignment	❌ ¹	✔️	?
Setting an image as an item	✔️	✔️	?
Setting an image + text as an item	✔️	❌ ¹	?
Setting a checkbox as first item in a row	✔️	✔️	?
Setting a progress bar as item	❌ ¹	✔️	?
Even/odd row coloring	❌ ¹	✔️	?
Transparent table background	✔️	❌	?
Optional grid lines displaying	✔️	✔️	?
Keyboard spatial navigation (up/down/selection)	✔️	?	?
Selectable row	✔️	✔️	?
Multiple rows selection	✔️	✔️	?
Disable row selection	❌ ¹	✔️	?
Change color of row selection	❌ ²	❌ ¹	?
Click event on individual item	✔️	✔️	?
Double-Click event on individual item	✔️	✔️	?
Automatic scrollbars	✔️	❌ ¹	?
Scrollbars disabling	✔️	✔️	?
Per-item infotip	✔️	✔️	?
Run-time row insertion/deletion	✔️	✔️	?
Run-time column insertion/deletion	✔️	✔️	?

¹ Not available by default, but can be implemented with moderate effort.
² Not available by default, and not sure if that can be implemented reliably with moderate effort.

View interfacing

Currently in the prototype implementation in table-view branch, all the header and content items are stored in a 2D block in /data facet:

view make face! [
    type: 'window
    offset: 400x200
    size: 600x600
    pane: reduce [
	make face! [
	    type: 'table
	    offset: 10x10
	    size: 300x300
	    data: [
	        ["Col1" "Col2"  "Col3"]
	        ["A"    "9"	"8"]
	        ["B"    "789"	"6"]
	        ["C"    "0"	"-5"]
	        ["D"    "1234"	"4"]
	        ["E"    "3"	"0"]
	    ]
        ]
    ]
]

That facet is meant to be reactive, so that any change there would be immediately reflected in the displayed table (not implemented yet).

Though, columns options need a place where to specify their properties. Also, if we want to support per-cell visual properties, we need a simple/efficient way to specify it.

Here is a simple test example on Windows 11 (23H4):