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fix(ui): 0.R4 - an action a UI button dispatches is reduced before the frame is presented

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ludic.ui runs a frame's presses after drawing it, and what they dispatched waited for the end of the
phase - after the host had presented - so a button's change showed a frame late. Decided: drain, not a
phase per action. ui_show and ui_press drain the queue once the presses have run, so the code after
them and the frame presented next see the change; a host that runs presses some other way calls
drain_actions() before it presents.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-26 07:08:26 +03:00
parent d46f0adb5e
commit 259b4d9b35
7 changed files with 46 additions and 3 deletions
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6
packages/ludic.ui/frame.ludic
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@ -1,5 +1,7 @@
# frame.ludic - a screen shown: built from the view's model, laid out, drawn, and its presses
# run once the frame is drawn, so nothing the view does can change a frame half way through it
# run once the frame is drawn, so nothing the view does can change a frame half way through it;
# the actions they dispatch are reduced before ui_show returns, so the frame presented next is built
# from what they changed
export function ui_show(ui_st: mut UiState, screen: string, view: UiView, x: float, y: float, w: float, h: float) -> void {
in_read(ui_st)
@ -25,6 +27,7 @@ export function ui_show(ui_st: mut UiState, screen: string, view: UiView, x: flo
dv_after(ui_st, screen, root)
lc_run(ui_st, screen)
nt_fired_run(ui_st)
drain_actions() # 0.R4: what the presses dispatched is reduced before the host presents
}
# the screen's nodes for this frame, not yet laid out - for a test, or a host that places them
export function ui_nodes(ui_st: mut UiState, screen: string, view: UiView) -> UiNode {
@ -78,6 +81,7 @@ export function ui_place(ui_st: mut UiState, root: UiNode, x: float, y: float, w
# a press, as if the pointer had made it
export function ui_press(ui_st: mut UiState, n: UiNode) -> void {
if n.act != null and n.enabled { act_run(ui_st, n.act, n.env) }
drain_actions()
}
# any event, as if the element had fired it - for a test
export function ui_event(ui_st: mut UiState, n: UiNode, name: string, value: Val) -> void { nt_run(ui_st, n, name, value) }