270 lines
8.4 KiB
Odin
270 lines
8.4 KiB
Odin
package synthas_ui
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v2 :: [2]f32
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rect2 :: struct {x, y, width, height: f32}
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col :: [4]u8
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SIZE_AUTO :: Size_Auto {}
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rect_get_tl :: #force_inline proc(rect: rect2) -> v2 {return {rect.x, rect.y}}
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rect_get_tr :: #force_inline proc(rect: rect2) -> v2 {return {rect.x + rect.width, rect.y}}
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rect_get_br :: #force_inline proc(rect: rect2) -> v2 {return {rect.x + rect.width, rect.y + rect.height}}
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rect_get_bl :: #force_inline proc(rect: rect2) -> v2 {return {rect.x, rect.y + rect.height}}
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rect_get_size :: #force_inline proc(rect: rect2) -> v2 {return {rect.width, rect.height}}
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rect_get_corners :: #force_inline proc(rect: rect2) -> (tl, tr, br, bl: v2) {return rect_get_tl(rect), rect_get_tr(rect), rect_get_br(rect), rect_get_bl(rect)}
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rect_grow :: #force_inline proc(rect: rect2, amount: v2) -> rect2 {return {rect.x - amount.x / 2.0, rect.y - amount.y / 2.0, rect.width + amount.x, rect.height + amount.y}}
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ctx: ^Context
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Context :: struct {
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origin: v2,
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container_count: u16,
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containers: [dynamic]int,
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container_last_element: [dynamic]int,
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elements: [dynamic]Element,
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same_line: bool,
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}
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CONTAINER_STACK_SIZE :: 16
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ElementId :: bit_field(int) {
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container_index: u16 | 16,
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element_index: u16 | 16,
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}
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Element :: struct {
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area: rect2,
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id: ElementId,
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using config: ElementConfiguration,
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data: rawptr,
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type: ElementType,
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dimensions: Dimensions,
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}
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element_id_invalid :: proc() -> ElementId {
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return {container_index = max(u16), element_index = max(u16)}
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}
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ElementConfiguration :: struct {
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label: cstring,
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color: col,
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margin, padding: v2,
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}
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ElementType :: enum {
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Container,
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Button,
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Slider,
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InputFloat,
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Dropdown,
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Custom0,
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Custom1,
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Custom2,
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Custom3,
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Custom4,
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Custom5,
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Custom6,
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Custom7,
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Custom8,
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Custom9,
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}
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@rodata element_type_input := bit_set[ElementType] {.InputFloat}
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Size_Pixels :: distinct f32
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Size_Percentage :: distinct f32
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Size_PercentageRemainder :: distinct f32
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Size_Auto :: distinct bool
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Size :: union #no_nil {
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Size_Pixels,
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Size_Percentage,
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Size_PercentageRemainder,
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Size_Auto,
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}
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Dimensions :: struct {
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width, height: Size,
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}
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Axis :: enum {X, Y}
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init :: proc(state: ^Context, element_capacity: int, allocator := context.allocator) {
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state.containers = make(type_of(state.containers), 0, CONTAINER_STACK_SIZE, allocator)
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state.container_last_element = make(type_of(state.container_last_element), 0, CONTAINER_STACK_SIZE, allocator)
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state.elements = make(type_of(state.elements), 0, element_capacity, allocator)
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}
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start :: proc(ui_context: ^Context, origin: v2, size: v2) {
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ctx = ui_context
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ctx.origin = origin
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ctx.container_count = 0
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clear(&ctx.elements)
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clear(&ctx.containers)
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clear(&ctx.container_last_element)
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append(&ctx.elements, Element{area = {**origin, **size}, type = .Container})
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append(&ctx.containers, 0)
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append(&ctx.container_last_element, -1)
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}
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end :: proc() -> []Element {
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assert(len(ctx.containers) < 2, "Didn't close all containers before ending UI layout mode")
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assert(len(ctx.containers) > 0, "Closed base container before ending UI layout mode")
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elements := ctx.elements[:]
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ctx = nil
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return elements[1:]
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}
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same_line :: proc() {
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ctx.same_line = true
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}
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focus_next_element :: proc(id: ElementId, elements: []Element, allowed_focus: bit_set[ElementType]) -> ElementId {
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if id == element_id_invalid() {
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return element_id_invalid()
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}
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element_index := int(id.element_index)
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for element_index < len(elements) {
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if elements[element_index].type in allowed_focus {
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return elements[element_index].id
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}
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element_index += 1
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}
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return element_id_invalid()
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}
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container_begin :: proc(dimensions: Dimensions, config: ElementConfiguration, data: rawptr = nil) -> ^Element {
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area := _resolve_element_area(dimensions, config.margin)
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ctx.container_count += 1
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element := _append_element({area = area, config = config, type = .Container, dimensions = dimensions, data = data})
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container_index := len(ctx.elements) - 1
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append(&ctx.containers, container_index)
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append(&ctx.container_last_element, -1)
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return element
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}
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container_end :: proc() {
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container_index := pop(&ctx.containers)
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container := &ctx.elements[container_index]
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pop(&ctx.container_last_element)
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_, width_is_auto := container.dimensions.width.(Size_Auto)
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_, height_is_auto := container.dimensions.height.(Size_Auto)
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if width_is_auto || height_is_auto {
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br := v2{min(f32), min(f32)}
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for element in ctx.elements[container_index:] {
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element_br := rect_get_br(get_element_outer_area(element))
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br = {max(br.x, element_br.x), max(br.y, element_br.y)}
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}
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if width_is_auto {
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container.area.width = br.x - container.area.x
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}
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if height_is_auto {
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container.area.height = br.y - container.area.y
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}
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}
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ctx.same_line = false
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}
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element :: proc(element_type: ElementType, dimensions: Dimensions, config: ElementConfiguration, data: rawptr = nil) -> ^Element {
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assert(element_type != .Container)
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container := _container_current()
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if _, is_auto := container.dimensions.width.(Size_Auto); is_auto {
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_, is_pixels := dimensions.width.(Size_Pixels)
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assert(is_pixels, "Any width that is not Size_Pixels is disallowed in a container using Size_Auto for width")
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}
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if _, is_auto := container.dimensions.height.(Size_Auto); is_auto {
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_, is_pixels := dimensions.height.(Size_Pixels)
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assert(is_pixels, "Any height that is not Size_Pixels is disallowed in a container using Size_Auto for height")
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}
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area := _resolve_element_area(dimensions, config.margin)
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return _append_element({area = area, config = config, type = element_type, dimensions = dimensions, data = data})
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}
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get_element_outer_area :: proc(element: Element) -> rect2 {
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return rect_grow(element.area, element.margin * 2.0)
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}
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get_element_inner_area :: proc(element: Element) -> rect2 {
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return rect_grow(element.area, -element.padding * 2.0)
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}
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_append_element :: proc(element: Element) -> ^Element {
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append(&ctx.elements, element)
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element_index := len(ctx.elements) - 1
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element := &ctx.elements[element_index]
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element.id = ElementId {container_index = ctx.container_count, element_index = u16(element_index)}
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ctx.container_last_element[len(ctx.containers) - 1] = element_index
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return element
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}
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_resolve_element_area :: proc(dimensions: Dimensions, margin: v2) -> rect2 {
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outer_position := _resolve_element_outer_position()
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outer_size := _resolve_element_outer_size(dimensions)
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return rect_grow(rect2{**outer_position, **outer_size}, -margin * 2.0)
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}
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_resolve_element_outer_position :: proc() -> v2 {
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defer {ctx.same_line = false}
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if alignment_element := _element_container_previous(); alignment_element != nil {
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if ctx.same_line {
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return rect_get_tr(get_element_outer_area(alignment_element^))
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} else {
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return {
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get_element_inner_area(_container_current()^).x,
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rect_get_bl(get_element_outer_area(alignment_element^)).y
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}
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}
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}
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return rect_get_tl(get_element_inner_area(_element_previous()^))
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}
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_resolve_element_outer_size :: proc(dimensions: Dimensions) -> v2 {
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return {_resolve_elemment_outer_size_axis(dimensions.width, .X), _resolve_elemment_outer_size_axis(dimensions.height, .Y)}
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}
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_resolve_elemment_outer_size_axis :: proc(size: Size, axis: Axis) -> f32 {
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switch value in size {
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case Size_Pixels:
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return f32(value)
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case Size_Percentage:
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inner := get_element_inner_area(_container_current()^)
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container_size := inner.width if axis == .X else inner.height
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return container_size * f32(value)
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case Size_PercentageRemainder:
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if element := _element_container_previous(); element != nil {
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container_inner := get_element_inner_area(_container_current()^)
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last_element_outer := get_element_outer_area(element^)
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remaining_container_size: f32
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switch axis {
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case .X: remaining_container_size = container_inner.width - rect_get_tr(last_element_outer).x
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case .Y: remaining_container_size = container_inner.height - rect_get_bl(last_element_outer).y
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}
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return remaining_container_size * f32(value)
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} else {
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inner := get_element_inner_area(_container_current()^)
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container_size := inner.width if axis == .X else inner.height
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return container_size * f32(value)
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}
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case Size_Auto:
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return 0.0
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}
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unreachable()
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}
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_container_current :: proc() -> ^Element {
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return &ctx.elements[ctx.containers[len(ctx.containers) - 1]]
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}
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_element_previous :: proc() -> ^Element {
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return &ctx.elements[len(ctx.elements) - 1]
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}
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_element_container_previous :: proc() -> ^Element {
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if previous_index := ctx.container_last_element[len(ctx.containers) - 1]; previous_index != -1 {
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return &ctx.elements[previous_index]
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} else {
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return nil
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}
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}
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