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Toward a more stateless design

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Synthasmagoria 2026-07-28 13:57:58 +02:00
commit d0f83b2d9d
2 changed files with 72 additions and 40 deletions
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28
example/main.odin
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@ -19,7 +19,7 @@ main :: proc() {
ui.init(&ctx, 4000)
for !rl.WindowShouldClose() {
ui.start(&ctx, {0, 0})
ui.start(&ctx, {0, 0}, {WINDOW_WIDTH, WINDOW_HEIGHT})
ui.container_begin(
dimensions = {ui.Size_Pixels(WINDOW_WIDTH), ui.Size_Pixels(WINDOW_HEIGHT)},
config = {
@ -29,16 +29,22 @@ main :: proc() {
label = "",
},
)
ui.container_begin(
dimensions = {ui.Size_Percentage(1.0), ui.Size_Percentage(0.1)},
config = {
margin = {0.0, 0.0},
padding = {0.0, 0.0},
color = cast([4]u8)rl.GREEN,
label = "",
},
)
ui.container_end()
ui.container_begin(
dimensions = {ui.Size_Percentage(1.0), ui.Size_Percentage(0.1)},
config = {
color = cast([4]u8)rl.GREEN,
label = "",
},
)
ui.container_end()
ui.container_begin(
dimensions = {ui.Size_Percentage(1.0), ui.Size_Percentage(0.1)},
config = {
color = cast([4]u8)rl.GREEN,
label = "",
},
)
ui.container_end()
ui.container_end()
elements := ui.end()

86
ui.odin
View file

@ -15,14 +15,18 @@ rect2 :: struct {x, y, width, height: f32}
@private ctx: ^Context
Context :: struct {
element_position: v2,
container_stack: [dynamic]^Element,
origin: v2,
containers: [dynamic]int,
container_last_element: [dynamic]int,
elements: [dynamic]Element,
same_line: bool,
}
@private CONTAINER_STACK_SIZE :: 16
init :: proc(state: ^Context, element_capacity: int, allocator := context.allocator) {
state.container_stack = make(type_of(state.container_stack), 0, 8, allocator)
state.containers = make(type_of(state.containers), 0, CONTAINER_STACK_SIZE, allocator)
state.container_last_element = make(type_of(state.container_last_element), 0, CONTAINER_STACK_SIZE, allocator)
state.elements = make(type_of(state.elements), 0, element_capacity, allocator)
}
@ -59,14 +63,26 @@ Dimensions :: struct {
Axis :: enum {X, Y}
start :: proc(ui_context: ^Context, position: v2) {
start :: proc(ui_context: ^Context, origin: v2, size: v2) {
ctx = ui_context
ctx.element_position = position
clear(&ctx.container_stack)
ctx.origin = origin
clear(&ctx.elements)
clear(&ctx.containers)
clear(&ctx.container_last_element)
append(&ctx.elements, Element{
area = {**origin, **size},
label = "",
color = {0, 0, 0, 0},
margin = {},
padding = {},
type = .Container})
append(&ctx.containers, 0)
append(&ctx.container_last_element, -1)
}
end :: proc() -> []Element {
assert(len(ctx.containers) < 2, "Didn't close all containers before ending UI layout mode")
assert(len(ctx.containers) > 0, "Closed base container before ending UI layout mode")
elements := ctx.elements[:]
ctx = nil
return elements
@ -85,29 +101,37 @@ element_get_inner_area :: proc(element: Element) -> rect2 {
}
container_begin :: proc(dimensions: Dimensions, config: ElementConfiguration) {
ctx.element_position += config.margin
position: v2
if len(ctx.containers) == 0 {
position = ctx.origin + config.margin
} else {
if alignment_element := _element_container_previous(); alignment_element != nil {
position = rect_get_tl(element_get_inner_area(alignment_element^)) + config.margin
} else {
position = rect_get_tl(element_get_inner_area(_element_previous()^)) + config.margin
}
}
size := _resolve_dimensions(dimensions) - config.margin * 2.0
area := rect2{**ctx.element_position, **size}
ctx.element_position += config.padding
element := Element{area = area, config = config, type = .Container}
element := Element{area = rect2{**position, **size}, config = config, type = .Container}
_append_element(element)
container_index := len(ctx.elements) - 1
append(&ctx.containers, container_index)
append(&ctx.container_last_element, -1)
}
@private _append_element :: proc(element: Element) {
append(&ctx.elements, element)
container := _element_last()
append(&ctx.container_stack, container)
ctx.container_last_element[len(ctx.containers) - 1] = len(ctx.elements) - 1
}
container_end :: proc() {
container := pop(&ctx.container_stack)
container := ctx.elements[pop(&ctx.containers)]
pop(&ctx.container_last_element)
// TODO: Set flex
outer := element_get_outer_area(container^)
ctx.element_position = rect_get_bl(outer)
outer := element_get_outer_area(container)
}
button :: proc(dimensions: Dimensions) {
area := _context_advance_area(dimensions)
}
_context_advance_area :: proc(dimensions: Dimensions) -> rect2 {
return {}
}
_resolve_dimensions :: proc(dimensions: Dimensions) -> v2 {
@ -119,7 +143,7 @@ _resolve_size :: proc(size: Size, axis: Axis) -> f32 {
case Size_Pixels:
return cast(f32)value
case Size_Percentage:
if container := _container_last(); container != nil {
if container := _container_current(); container != nil {
inner := element_get_inner_area(container^)
container_size := inner.width if axis == .X else inner.height
return container_size * cast(f32)value
@ -132,16 +156,18 @@ _resolve_size :: proc(size: Size, axis: Axis) -> f32 {
unreachable()
}
_container_last :: proc() -> ^Element {
if len(ctx.container_stack) == 0 {
return nil
}
return ctx.container_stack[len(ctx.container_stack) - 1]
_container_current :: proc() -> ^Element {
return &ctx.elements[ctx.containers[len(ctx.containers) - 1]]
}
_element_last :: proc() -> ^Element {
if len(ctx.elements) == 0 {
return nil
}
_element_previous :: proc() -> ^Element {
return &ctx.elements[len(ctx.elements) - 1]
}
_element_container_previous :: proc() -> ^Element {
if previous_index := ctx.container_last_element[len(ctx.containers) - 1]; previous_index != -1 {
return &ctx.elements[previous_index]
} else {
return nil
}
}