I love control flow

Cargo.toml

@@ -2,6 +2,7 @@
 name = "iris"
 version = "0.1.0"
 edition = "2024"
+default-run = "test"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

src/bin/test/input.rs

@@ -1,3 +1,4 @@
+use crate::Client;
 use iris::{
     core::{CursorState, Modifiers},
     layout::Vec2,
@@ -7,8 +8,6 @@ use winit::{
     keyboard::{Key, NamedKey},
 };
 
-use crate::testing::Client;
-
 #[derive(Default)]
 pub struct Input {
     cursor: CursorState,

src/bin/test/main.rs

@@ -1,20 +1,18 @@
-use std::sync::Arc;
-
 use app::App;
 use arboard::Clipboard;
 use cosmic_text::Family;
+use input::Input;
 use iris::prelude::*;
-use render::Renderer;
-use winit::{event::WindowEvent, event_loop::ActiveEventLoop, window::Window};
-
-use crate::testing::input::Input;
 use len_fns::*;
+use render::Renderer;
+use std::sync::Arc;
+use winit::{event::WindowEvent, event_loop::ActiveEventLoop, window::Window};
 
 mod app;
 mod input;
 mod render;
 
-pub fn main() {
+fn main() {
     App::run();
 }
 
@@ -100,8 +98,6 @@ impl Client {
             .stack()
             .add_static(&mut ui);
 
-        let main = pad_test.pad(10).add_static(&mut ui);
-
         let btext = |content| text(content).size(30);
 
         let text_test = (
@@ -176,6 +172,8 @@ impl Client {
             .span(Dir::DOWN)
             .add_static(&mut ui);
 
+        let main = pad_test.pad(10).add_static(&mut ui);
+
         let switch_button = |color, to, label| {
             let rect = rect(color)
                 .id_on(CursorSense::click(), move |id, ui: &mut Ui, _| {

src/core/position/mod.rs

@@ -1,6 +1,7 @@
 mod align;
 mod offset;
 mod pad;
+mod scroll;
 mod sized;
 mod span;
 mod stack;

src/core/position/scroll.rs

@@ -0,0 +1,39 @@
+use crate::prelude::*;
+
+pub struct Scroll {
+    inner: WidgetId,
+    axis: Axis,
+    snap_end: bool,
+    amt: f32,
+    draw_len: f32,
+}
+
+impl Widget for Scroll {
+    fn draw(&mut self, painter: &mut Painter) {
+        let output_len = painter.output_size().axis(self.axis);
+        let container_len = painter.region().axis(self.axis).len();
+        let content_len = painter
+            .len_axis(&self.inner, self.axis)
+            .apply_rest()
+            .within_len(container_len)
+            .to_abs(output_len);
+        let container_len = container_len.to_abs(output_len);
+        self.draw_len = content_len;
+        // let region = UiRegion::FULL.offset(self.amt);
+        // painter.widget_within(&self.inner, region);
+    }
+
+    fn desired_width(&mut self, _: &mut SizeCtx) -> Len {
+        Len::default()
+    }
+
+    fn desired_height(&mut self, _: &mut SizeCtx) -> Len {
+        Len::default()
+    }
+}
+
+impl Scroll {
+    pub fn scroll(&mut self, amt: f32) {
+        self.amt += amt;
+    }
+}

src/core/position/span.rs

@@ -11,6 +11,9 @@ impl Widget for Span {
     fn draw(&mut self, painter: &mut Painter) {
         let total = self.len_sum(&mut painter.size_ctx());
         let mut start = UiScalar::rel_min();
+        if painter.label() == "fricker" {
+            println!("redraw");
+        }
         for child in &self.children {
             let mut span = UiSpan::FULL;
             span.start = start;
@@ -88,7 +91,10 @@ impl Span {
     }
 
     fn desired_ortho(&mut self, ctx: &mut SizeCtx) -> Len {
-        // this is an awful hack to get text wrapping to work properly when in a downward span
+        // this is a weird hack to get text wrapping to work properly when in a downward span
+        // the correct solution here is to add a function to widget that lets them
+        // request that ctx.outer has an axis "resolved" before checking the other,
+        // and panicking or warning if two request opposite axis (unsolvable in that case)
         let outer = ctx.outer.axis(self.dir.axis);
         if self.dir.axis == Axis::X {
             // so....... this literally copies draw so that the lengths are correctly set in the

src/core/text/edit.rs

@@ -26,7 +26,6 @@ impl TextEdit {
             .lines
             .iter()
             .map(|l| l.text())
-            // why is this needed?? what??
             .collect::<Vec<_>>()
             .join("\n")
     }
@@ -44,9 +43,7 @@ impl Widget for TextEdit {
             let size = vec2(1, self.attrs.line_height);
             painter.primitive_within(
                 RectPrimitive::color(Color::WHITE),
-                size.align(Align::TOP_LEFT)
-                    .offset(offset)
-                    .within(&region),
+                size.align(Align::TOP_LEFT).offset(offset).within(&region),
             );
         }
     }

src/layout/orientation/len.rs

@@ -29,6 +29,12 @@ impl<Nx: UiNum, Ny: UiNum> From<(Nx, Ny)> for Size {
     }
 }
 
+impl From<Len> for Size {
+    fn from(value: Len) -> Self {
+        Self { x: value, y: value }
+    }
+}
+
 impl Size {
     pub const ZERO: Self = Self {
         x: Len::ZERO,
@@ -171,10 +177,10 @@ impl std::fmt::Display for Len {
             write!(f, "{} abs;", self.abs)?;
         }
         if self.rel != 0.0 {
-            write!(f, "{} rel;", self.abs)?;
+            write!(f, "{} rel;", self.rel)?;
         }
         if self.rest != 0.0 {
-            write!(f, "{} leftover;", self.abs)?;
+            write!(f, "{} rest;", self.rest)?;
         }
         Ok(())
     }

src/layout/orientation/pos.rs

@@ -78,7 +78,10 @@ impl UiVec2 {
     }
 
     pub fn to_abs(&self, rel: Vec2) -> Vec2 {
-        self.get_rel() * rel + self.get_abs()
+        Vec2 {
+            x: self.x.to_abs(rel.x),
+            y: self.y.to_abs(rel.y),
+        }
     }
 
     pub const FULL_SIZE: Self = Self::rel(Vec2::ONE);
@@ -231,6 +234,10 @@ impl UiScalar {
     pub const fn to(&self, end: Self) -> UiSpan {
         UiSpan { start: *self, end }
     }
+
+    pub const fn to_abs(&self, rel: f32) -> f32 {
+        self.rel * rel + self.abs
+    }
 }
 
 #[repr(C)]
@@ -323,6 +330,14 @@ impl UiRegion {
             y: self.y.outside(&parent.y),
         }
     }
+
+    pub const fn axis(&mut self, axis: Axis) -> &UiSpan {
+        match axis {
+            Axis::X => &self.x,
+            Axis::Y => &self.y,
+        }
+    }
+
     pub const fn axis_mut(&mut self, axis: Axis) -> &mut UiSpan {
         match axis {
             Axis::X => &mut self.x,

src/layout/painter.rs

@@ -29,19 +29,20 @@ pub struct PainterCtx<'a> {
     pub textures: &'a mut Textures,
     pub masks: &'a mut TrackedArena<Mask, u32>,
     pub text: &'a mut TextData,
-    pub screen_size: Vec2,
+    pub output_size: Vec2,
     pub modules: &'a mut Modules,
     pub cache_width: HashMap<Id, (UiVec2, Len)>,
     pub cache_height: HashMap<Id, (UiVec2, Len)>,
     draw_started: HashSet<Id>,
 }
 
-#[derive(Default)]
+#[derive(Clone, Copy, Debug, Default)]
 pub struct ResizeRef {
     x: Option<(Id, (UiVec2, Len))>,
     y: Option<(Id, (UiVec2, Len))>,
 }
 
+#[derive(Debug)]
 pub struct WidgetInstance {
     pub id: Id,
     pub region: UiRegion,
@@ -75,7 +76,7 @@ impl<'a> PainterCtx<'a> {
             layers: &mut data.layers,
             textures: &mut data.textures,
             text: &mut data.text,
-            screen_size: data.output_size,
+            output_size: data.output_size,
             modules: &mut data.modules,
             masks: &mut data.masks,
             cache_width: Default::default(),
@@ -91,9 +92,16 @@ impl<'a> PainterCtx<'a> {
         let Some(active) = self.active.get(&id) else {
             return;
         };
+        let mut resize = active.resize;
 
-        // TODO: this is stupid having 2 of these
-        if let Some((rid, (outer, old_desired))) = active.resize.x {
+        let finish = |s: &mut Self, resize| {
+            if let Some(active) = s.active.get_mut(&id) {
+                active.resize = resize;
+            }
+        };
+
+        // TODO: this is stupid having 2 of these, don't ask me what the consequences are
+        if let Some((rid, (outer, old_desired))) = &mut resize.x {
             let new_desired = SizeCtx {
                 source: id,
                 cache_width: &mut self.cache_width,
@@ -101,25 +109,23 @@ impl<'a> PainterCtx<'a> {
                 text: self.text,
                 textures: self.textures,
                 widgets: self.widgets,
-                outer,
-                output_size: self.screen_size,
+                outer: *outer,
+                output_size: self.output_size,
                 checked_width: &mut Default::default(),
                 checked_height: &mut Default::default(),
                 id,
             }
             .width_inner(id);
-            if new_desired != old_desired {
-                self.redraw(rid);
+            if new_desired != *old_desired {
+                self.redraw(*rid);
+                *old_desired = new_desired;
                 if self.draw_started.contains(&id) {
-                    return;
+                    return finish(self, resize);
                 }
             }
         }
 
-        let Some(active) = self.active.get(&id) else {
-            return;
-        };
-        if let Some((rid, (outer, old_desired))) = active.resize.y {
+        if let Some((rid, (outer, old_desired))) = &mut resize.y {
             let new_desired = SizeCtx {
                 source: id,
                 cache_width: &mut self.cache_width,
@@ -127,17 +133,18 @@ impl<'a> PainterCtx<'a> {
                 text: self.text,
                 textures: self.textures,
                 widgets: self.widgets,
-                outer,
-                output_size: self.screen_size,
+                outer: *outer,
+                output_size: self.output_size,
                 checked_width: &mut Default::default(),
                 checked_height: &mut Default::default(),
                 id,
             }
             .height_inner(id);
-            if new_desired != old_desired {
-                self.redraw(rid);
+            if new_desired != *old_desired {
+                self.redraw(*rid);
+                *old_desired = new_desired;
                 if self.draw_started.contains(&id) {
-                    return;
+                    return finish(self, resize);
                 }
             }
         }
@@ -154,7 +161,7 @@ impl<'a> PainterCtx<'a> {
             active.mask,
             Some(active.children),
         );
-        self.active.get_mut(&id).unwrap().resize = active.resize;
+        finish(self, resize);
     }
 
     pub fn draw(&mut self, id: Id) {
@@ -399,7 +406,7 @@ impl<'a, 'c> Painter<'a, 'c> {
             text: self.ctx.text,
             textures: self.ctx.textures,
             widgets: self.ctx.widgets,
-            output_size: self.ctx.screen_size,
+            output_size: self.ctx.output_size,
             checked_width: &mut self.children_width,
             checked_height: &mut self.children_height,
             cache_width: &mut self.ctx.cache_width,
@@ -410,8 +417,12 @@ impl<'a, 'c> Painter<'a, 'c> {
         }
     }
 
+    pub fn output_size(&self) -> Vec2 {
+        self.ctx.output_size
+    }
+
     pub fn px_size(&mut self) -> Vec2 {
-        self.region.size().to_abs(self.ctx.screen_size)
+        self.region.size().to_abs(self.ctx.output_size)
     }
 
     pub fn text_data(&mut self) -> &mut TextData {

src/layout/texture.rs

@@ -7,7 +7,7 @@ use image::{DynamicImage, GenericImageView};
 
 use crate::{layout::Vec2, render::TexturePrimitive, util::RefCounter};
 
-#[derive(Clone)]
+#[derive(Debug, Clone)]
 pub struct TextureHandle {
     inner: TexturePrimitive,
     size: Vec2,

src/layout/ui.rs

@@ -4,7 +4,7 @@ use crate::{
     core::{TextEdit, TextEditCtx},
     layout::{
         IdLike, PainterCtx, PainterData, PixelRegion, StaticWidgetId, TextureHandle, Vec2, Widget,
-        WidgetId, WidgetLike,
+        WidgetId, WidgetInstance, WidgetLike,
     },
     util::{HashSet, Id},
 };
@@ -184,20 +184,11 @@ impl Ui {
         Some(region.to_px(self.data.output_size))
     }
 
-    pub fn debug(&self, label: &str) {
-        for (id, inst) in &self.data.active {
-            let l = &self.data.widgets.data(id).unwrap().label;
-            if l != label {
-                continue;
-            }
-            println!("\"{label}\" {{");
-            println!("    region: {}", inst.region);
-            println!(
-                "    pixel region: {}",
-                inst.region.to_px(self.data.output_size)
-            );
-            println!("}}");
-        }
+    pub fn debug(&self, label: &str) -> impl Iterator<Item = &WidgetInstance> {
+        self.data.active.iter().filter_map(move |(id, inst)| {
+            let l = &self.data.widgets.label(id);
+            if *l == label { Some(inst) } else { None }
+        })
     }
 }
 

src/main.rs

@@ -1,5 +0,0 @@
-mod testing;
-
-fn main() {
-    testing::main();
-}

src/render/primitive.rs

@@ -223,7 +223,7 @@ impl RectPrimitive {
 }
 
 #[repr(C)]
-#[derive(Copy, Clone)]
+#[derive(Debug, Copy, Clone)]
 pub struct TexturePrimitive {
     pub view_idx: u32,
     pub sampler_idx: u32,

src/util/id.rs

@@ -26,6 +26,9 @@ impl<I: IdNum> IdTracker<I> {
 }
 
 impl<I: IdNum> Id<I> {
+    pub(crate) fn raw(id: I) -> Self {
+        Self(id)
+    }
     pub fn idx(&self) -> usize {
         self.0.idx()
     }

src/util/refcount.rs

@@ -3,6 +3,7 @@ use std::sync::{
     atomic::{AtomicU32, Ordering},
 };
 
+#[derive(Debug)]
 pub struct RefCounter(Arc<AtomicU32>);
 
 impl RefCounter {