331 lines
9.4 KiB
Rust
331 lines
9.4 KiB
Rust
use crate::{
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layout::{
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ActiveWidgets, Layers, Modules, TextAttrs, TextBuffer, TextData, TextOffset, TextureHandle,
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Textures, UiRegion, UiVec2, Vec2, WidgetId, Widgets,
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},
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render::{Primitive, PrimitiveHandle},
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util::{HashMap, HashSet, Id, IdUtil},
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};
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pub struct Painter<'a, 'c> {
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ctx: &'a mut PainterCtx<'c>,
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region: UiRegion,
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textures: Vec<TextureHandle>,
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primitives: Vec<PrimitiveHandle>,
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children: Vec<Id>,
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sized_children: HashMap<Id, UiVec2>,
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pub layer: usize,
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id: Id,
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}
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pub struct PainterCtx<'a> {
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pub widgets: &'a Widgets,
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pub active: &'a mut ActiveWidgets,
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pub layers: &'a mut Layers,
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pub textures: &'a mut Textures,
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pub text: &'a mut TextData,
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pub screen_size: Vec2,
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pub modules: &'a mut Modules,
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drawing: HashSet<Id>,
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}
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pub struct WidgetInstance {
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pub id: Id,
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pub region: UiRegion,
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pub parent: Option<Id>,
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pub textures: Vec<TextureHandle>,
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pub primitives: Vec<PrimitiveHandle>,
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pub children: Vec<Id>,
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pub resize: Option<(Id, UiVec2)>,
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pub layer: usize,
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}
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impl<'a> PainterCtx<'a> {
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pub fn new(
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widgets: &'a Widgets,
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layers: &'a mut Layers,
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active: &'a mut ActiveWidgets,
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modules: &'a mut Modules,
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textures: &'a mut Textures,
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text: &'a mut TextData,
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screen_size: Vec2,
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) -> Self {
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Self {
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widgets,
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active,
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layers,
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textures,
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text,
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screen_size,
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modules,
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drawing: HashSet::default(),
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}
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}
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pub fn redraw(&mut self, id: &Id) {
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self.drawing.clear();
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let Some(active) = self.active.get(id) else {
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return;
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};
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if let Some((rid, size)) = &active.resize {
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let checked = &mut HashMap::default();
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let mut ctx = SizeCtx {
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checked,
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text: self.text,
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textures: self.textures,
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widgets: self.widgets,
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};
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let desired = ctx.size_inner(id);
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if *size != desired {
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self.redraw(&rid.duplicate());
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if self.drawing.contains(id) {
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return;
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}
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}
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}
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let Some(active) = self.remove(id) else {
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return;
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};
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self.draw_inner(
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active.layer,
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id,
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active.region,
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active.parent.duplicate(),
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Some(active.children),
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);
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self.active.get_mut(id).unwrap().resize = active.resize;
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}
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pub fn draw(&mut self, id: &Id) {
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self.drawing.clear();
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self.layers.clear();
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self.draw_inner(0, id, UiRegion::full(), None, None);
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}
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fn draw_inner(
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&mut self,
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layer: usize,
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id: &Id,
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region: UiRegion,
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parent: Option<Id>,
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old_children: Option<Vec<Id>>,
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) {
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// I have no idea if these checks work lol
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// the idea is u can't redraw stuff u already drew,
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// and if parent is different then there's another copy with a different parent
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// but this has a very weird issue where you can't move widgets unless u remove first
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// so swapping is impossible rn I think?
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// there's definitely better solutions like a counter (>1 = panic) but don't care rn
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if self.drawing.contains(id) {
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panic!("Cannot draw the same widget twice (1)");
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}
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let mut old_children = old_children.unwrap_or_default();
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let mut resize = None;
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if let Some(active) = self.active.get_mut(id) {
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if active.parent != parent {
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panic!("Cannot draw the same widget twice (2)");
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}
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if active.region == region {
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return;
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}
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// TODO:
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// else if active.region.size() == region.size() { move }
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let active = self.remove(id).unwrap();
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old_children = active.children;
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resize = active.resize;
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}
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self.drawing.insert(id.duplicate());
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let mut painter = Painter {
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region,
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layer,
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id: id.duplicate(),
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textures: Vec::new(),
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primitives: Vec::new(),
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ctx: self,
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children: Vec::new(),
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sized_children: Default::default(),
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};
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// draw widgets
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painter.ctx.widgets.get_dyn_dynamic(id).draw(&mut painter);
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let sized_children = painter.sized_children;
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// add to active
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let instance = WidgetInstance {
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id: id.duplicate(),
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region,
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parent,
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textures: painter.textures,
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primitives: painter.primitives,
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children: painter.children,
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resize,
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layer,
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};
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for (cid, size) in sized_children {
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if let Some(w) = self.active.get_mut(&cid) {
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w.resize = Some((id.duplicate(), size))
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}
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}
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for c in &old_children {
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if !instance.children.contains(c) {
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self.remove_rec(c);
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}
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}
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for m in self.modules.iter_mut() {
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m.on_draw(&instance);
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}
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self.active.insert(id.duplicate(), instance);
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}
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/// NOTE: instance textures are cleared and self.textures freed
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fn remove(&mut self, id: &Id) -> Option<WidgetInstance> {
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let mut inst = self.active.remove(id);
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if let Some(inst) = &mut inst {
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for h in &inst.primitives {
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self.layers.free(h);
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}
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inst.textures.clear();
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self.textures.free();
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for m in self.modules.iter_mut() {
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m.on_undraw(inst);
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}
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}
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inst
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}
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fn remove_rec(&mut self, id: &Id) -> Option<WidgetInstance> {
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let inst = self.remove(id);
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if let Some(inst) = &inst {
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for c in &inst.children {
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self.remove_rec(c);
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}
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}
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inst
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}
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}
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impl<'a, 'c> Painter<'a, 'c> {
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fn primitive_at<P: Primitive>(&mut self, primitive: P, region: UiRegion) {
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let h = self
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.ctx
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.layers
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.write(self.layer, self.id.duplicate(), primitive, region);
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self.primitives.push(h);
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}
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/// Writes a primitive to be rendered
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pub fn primitive<P: Primitive>(&mut self, primitive: P) {
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self.primitive_at(primitive, self.region)
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}
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pub fn primitive_within<P: Primitive>(&mut self, primitive: P, region: UiRegion) {
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self.primitive_at(primitive, region.within(&self.region));
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}
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/// Draws a widget within this widget's region.
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pub fn widget<W>(&mut self, id: &WidgetId<W>) {
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self.widget_at(id, self.region);
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}
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/// Draws a widget somewhere within this one.
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/// Useful for drawing child widgets in select areas.
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pub fn widget_within<W>(&mut self, id: &WidgetId<W>, region: UiRegion) {
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self.widget_at(id, region.within(&self.region));
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}
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fn widget_at<W>(&mut self, id: &WidgetId<W>, region: UiRegion) {
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self.children.push(id.id.duplicate());
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self.ctx
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.draw_inner(self.layer, &id.id, region, Some(self.id.duplicate()), None);
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}
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pub fn texture_within(&mut self, handle: &TextureHandle, region: UiRegion) {
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self.textures.push(handle.clone());
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self.primitive_at(handle.primitive(), region.within(&self.region));
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}
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pub fn texture(&mut self, handle: &TextureHandle) {
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self.textures.push(handle.clone());
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self.primitive(handle.primitive());
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}
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pub fn texture_at(&mut self, handle: &TextureHandle, region: UiRegion) {
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self.textures.push(handle.clone());
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self.primitive_at(handle.primitive(), region);
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}
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/// returns (handle, offset from top left)
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pub fn render_text(
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&mut self,
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buffer: &mut TextBuffer,
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attrs: &TextAttrs,
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) -> (TextureHandle, TextOffset) {
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self.ctx.text.draw(buffer, attrs, self.ctx.textures)
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}
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pub fn region(&self) -> UiRegion {
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self.region
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}
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pub fn size<W>(&mut self, id: &WidgetId<W>) -> UiVec2 {
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self.size_ctx().size(id)
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}
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pub fn size_ctx(&mut self) -> SizeCtx<'_> {
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SizeCtx {
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text: self.ctx.text,
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textures: self.ctx.textures,
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widgets: self.ctx.widgets,
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checked: &mut self.sized_children,
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}
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}
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pub fn text_data(&mut self) -> &mut TextData {
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self.ctx.text
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}
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pub fn child_layer(&mut self) {
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self.layer = self.ctx.layers.child(self.layer);
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}
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pub fn next_layer(&mut self) {
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self.layer = self.ctx.layers.next(self.layer);
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}
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}
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pub struct SizeCtx<'a> {
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pub text: &'a mut TextData,
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pub textures: &'a mut Textures,
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widgets: &'a Widgets,
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checked: &'a mut HashMap<Id, UiVec2>,
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}
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impl SizeCtx<'_> {
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fn size_inner(&mut self, id: &Id) -> UiVec2 {
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let size = self.widgets.get_dyn_dynamic(id).desired_size(self);
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self.checked.insert(id.duplicate(), size);
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size
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}
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pub fn size<W>(&mut self, id: &WidgetId<W>) -> UiVec2 {
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// TODO: determine if this is useful
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// if let Some(size) = self.checked.get(&id.id) {
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// return Some(*size);
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// }
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self.size_inner(&id.id)
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}
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pub fn draw_text(
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&mut self,
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buffer: &mut TextBuffer,
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attrs: &TextAttrs,
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) -> (TextureHandle, TextOffset) {
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self.text.draw(buffer, attrs, self.textures)
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}
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}
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