android-ui-dogfooding/m3_layout.odin

package main

import engine "shared:zephr"

// Explicitly scoped containers.
//
// engine.ui_row/ui_column/ui_scroll_column carry @(deferred_none=pop_parent),
// so they pop when the *calling scope* ends. That is fine when a container and
// all its children sit in one proc, but it makes them unusable for anything
// opened in one proc and closed in another -- a begin/end pair, or a container
// that must close before a sibling is drawn. In those cases the row pops the
// instant the helper returns and the children land in the wrong parent.
//
// These push explicitly, with no deferred pop, so the caller controls the scope.
// caller is threaded through because box identity is hashed from it: wrapping
// ui_create_box_with_id without it would give every call site the same id.

open_row :: proc(id: engine.Id = 0, caller := #caller_location) -> ^engine.Box {
    engine.set_next_layout_axis(.X)
    b := engine.ui_create_box_with_id({}, id, caller)
    engine.push_parent(b)
    return b
}

open_column :: proc(id: engine.Id = 0, caller := #caller_location) -> ^engine.Box {
    engine.set_next_layout_axis(.Y)
    b := engine.ui_create_box_with_id({}, id, caller)
    engine.push_parent(b)
    return b
}

open_scroll_column :: proc(id: engine.Id = 0, caller := #caller_location) -> ^engine.Box {
    engine.set_next_layout_axis(.Y)
    engine.ui_set_next_flags({.ClipToBounds, .ScrollableY})
    b := engine.ui_create_box_with_id({}, id, caller)
    engine.push_parent(b)
    return b
}

close_box :: proc() {
    engine.pop_parent()
}