This required a little more restructuring of Global_state. It's not flat
now, it's hierarchical again, but in a different way.
after commit 3d89b8eb9d:
post
\- reply A
\- reply B
\- reply C
after commit f9f7dab9b7:
post
reply A
reply B
reply C
after this commit:
row
\- col
\- indent 0
\- post
\- col
\- indent 1
\- reply A
\- col
\- indent 2
\- reply B
\- col
\- indent 1
\- reply C
The indents are just invisible rectangles of different widths with 0
height.
One change I had to make was to initialize_editor. Neither luaML and
driver load lines from disk, but that's arguably the common scenario to
support.
Instead of a tree of items, we now have a flat list. Each item knows its
depth. This structure is closer to what luaML's compute_layout needs.
For any future hierarchical functionality, each item still knows its
parent and replies as ids inside the metadata field.
Next step: redo A for this app. compute_layout should stay fairly
timeless across forks of luaML.
Pace layers for apps built on the box model:
A
B
...
F (I think of on.draw as F)
A runs least frequently, F runs on every frame.
In this app, the plan is:
* initialize_thread will load items inside Global_state
* A will convert items into a relatively stable box model of rows,
columns and text editors in Surface, using compute_layout as a
helper.
* B will recompute some aspects of Surface as the viewport moves.
Anything that changes the height of any box needs to rerun A. Anything
that moves the viewport reruns B.