iris: move text state into shared resources

app/examples/phone.rs

@@ -56,7 +56,7 @@ impl DesktopAppState for Client {
         let screen = match ai_app::ui::fixture::open(rsc, &mut ui_state) {
             Ok(opened) => {
                 if let Some(message) = message_argv() {
-                    opened.screen.composer.field.edit(rsc).set(&message);
+                    (opened.screen.composer.field)(rsc).set(&message);
                 }
                 if let Some(text) = typed_argv() {
                     let field = opened.screen.composer.field;
@@ -66,8 +66,8 @@ impl DesktopAppState for Client {
                             ctx.update(move |state: &mut Client, rsc| {
                                 state.set_focus(Some(field));
                                 let end = rsc[field].text().len();
-                                let mut edit = field.edit(rsc);
+                                let edit = field(rsc);
-                                if edit.text.caret().is_none() {
+                                if edit.caret().is_none() {
                                     edit.set_cursor_byte(end);
                                 }
                                 edit.insert(&ch.to_string());

app/src/android/bench_client.rs

@@ -144,7 +144,7 @@ impl BenchClient {
             .any();
         ui_state.set_root(rsc, tree);
 
-        let font = rsc.ui.text.font_diagnostics();
+        let font = rsc.ui.text.borrow_mut().font_diagnostics();
         log::info!(
             "iris fonts: {} families found, default={:?} mono={:?}, resolved regular={:?} \
              bold={:?} italic={:?} mono={:?}",
@@ -400,7 +400,7 @@ impl BenchClient {
 
     fn show_diagnostics(&mut self, rsc: &mut Rsc) {
         let report = self.diagnostics_text(rsc);
-        self.report_display.edit(rsc).set(&report);
+        self.report_display(rsc).set(&report);
         self.last_report = Some(report);
     }
 
@@ -423,7 +423,7 @@ impl BenchClient {
     /// the keyboard-open capture (which only logs it), so the two can
     /// never drift into reporting different things.
     fn diagnostics_text(&self, rsc: &mut Rsc) -> String {
-        let font = rsc.ui.text.font_diagnostics();
+        let font = rsc.ui.text.borrow_mut().font_diagnostics();
         let frame_report = match self.android_state().frame_report.report() {
             Some(stats) => format!("{stats}"),
             None => "no frames recorded yet".to_string(),
@@ -481,7 +481,7 @@ impl BenchClient {
         }
         self.running = true;
         self.android_state_mut().frame_report.reset();
-        self.report_display.edit(rsc).set("Running benchmark...");
+        self.report_display(rsc).set("Running benchmark...");
 
         let platform = self.platform.clone();
         let stream_tail = self.stream_tail.clone();
@@ -620,7 +620,7 @@ impl BenchClient {
                      {rss_line}\n{battery}"
                 );
                 log::info!("iris bench report: {report}");
-                state.report_display.edit(rsc).set(&report);
+                state.report_display(rsc).set(&report);
                 state.last_report = Some(report);
             });
         });
@@ -776,7 +776,7 @@ async fn run_type_phase(
         let text = typed.clone();
         ctx.update(move |state: &mut BenchClient, rsc| {
             if let Some(screen) = &state.screen {
-                screen.composer.field.edit(rsc).set(&text);
+                (screen.composer.field)(rsc).set(&text);
             }
         });
         tokio::time::sleep(Duration::from_millis(TYPE_CHAR_MS)).await;
@@ -787,7 +787,7 @@ async fn run_type_phase(
         let text = typed.clone();
         ctx.update(move |state: &mut BenchClient, rsc| {
             if let Some(screen) = &state.screen {
-                screen.composer.field.edit(rsc).set(&text);
+                (screen.composer.field)(rsc).set(&text);
             }
         });
         tokio::time::sleep(Duration::from_millis(TYPE_CHAR_MS)).await;

app/src/android/transcript_client.rs

@@ -245,19 +245,19 @@ impl TranscriptClient {
         let in_progress = self
             .screen
             .as_ref()
-            .map(|screen| screen.composer.field.edit(rsc).text.text().to_string())
+            .map(|screen| (screen.composer.field)(rsc).text().to_string())
             .filter(|t| !t.is_empty());
 
         let rows = group_tool_runs(&self.items);
         let (screen, tree) = ui::build_tree(rsc, rows);
 
         if let Some(text) = in_progress {
-            screen.composer.field.edit(rsc).set(&text);
+            (screen.composer.field)(rsc).set(&text);
         }
         if let Some(session_id) = self.session_id.clone() {
             let field = screen.composer.field;
             rsc.register_event(field, Submit, move |ctx, rsc| {
-                let text = field.edit(rsc).take();
+                let text = field(rsc).take();
                 let text = text.trim().to_string();
                 if !text.is_empty() {
                     ctx.state.send_message(session_id.clone(), text);

app/src/desktop/app.rs

@@ -290,19 +290,19 @@ impl Client {
         let in_progress = self
             .screen
             .as_ref()
-            .map(|screen| screen.composer.field.edit(rsc).text.text().to_string())
+            .map(|screen| (screen.composer.field)(rsc).text().to_string())
             .filter(|t| !t.is_empty());
 
         let rows = group_tool_runs(&self.items);
         let (screen, tree) = crate::ui::build_tree(rsc, rows);
 
         if let Some(text) = in_progress {
-            screen.composer.field.edit(rsc).set(&text);
+            (screen.composer.field)(rsc).set(&text);
         }
         if let Some(session_id) = self.selected.clone() {
             let field = screen.composer.field;
             rsc.register_event(field, Submit, move |ctx, rsc| {
-                let text = field.edit(rsc).take();
+                let text = field(rsc).take();
                 let text = text.trim().to_string();
                 if !text.is_empty() {
                     ctx.state.send_message(session_id.clone(), text);

app/src/ui/composer.rs

@@ -6,8 +6,7 @@ const APPROX_LINE_HEIGHT_DP: f32 = 24.0;
 const FIELD_PAD_DP: f32 = 12.0;
 
 /// `field` is exposed so the caller can read its content on submit
-/// (`field.edit(rsc).text()`) and clear it afterward
+/// (`field(rsc).text()`) and clear it afterward (`field(rsc).set("")`).
-/// (`field.edit(rsc).set("")`).
 pub struct Composer {
     pub field: WeakWidget<TextEdit>,
     /// The bar's own outer padding -- only `bottom` is ever changed, by

app/src/ui/mod.rs

@@ -532,6 +532,24 @@ mod apply_tests {
         out
     }
 
+    #[test]
+    fn registering_a_font_after_drawing_invalidates_its_text_owner() {
+        let mut rsc = TestRsc {
+            ui: Ui::default(),
+            events: EventManager::default(),
+        };
+        rsc.ui.resize((800.0, 600.0));
+        let root = wtext("already shaped").add_strong(&mut rsc).any();
+        rsc.draw(&root);
+        assert!(!rsc.widgets().has_updates());
+
+        rsc.ui.register_font("late-icons", ICON_FONT).unwrap();
+
+        assert!(rsc.widgets().has_updates());
+        rsc.draw(&root);
+        assert!(!rsc.widgets().has_updates());
+    }
+
     fn cost_of_one_delta(paragraphs: usize) -> (u64, u64) {
         let mut rsc = TestRsc {
             ui: Ui::default(),

app/tests/phone_screen.rs

@@ -197,14 +197,14 @@ fn a_space_in_the_composer_finishes_layout() {
     screen.composer.set_bottom_inset(&mut h.rsc, 1000.0);
     h.frame(PHONE_FRAME_MS * 2);
     h.state.set_focus(Some(screen.composer.field));
-    screen.composer.field.edit(&mut h.rsc).set_cursor_byte(0);
+    (screen.composer.field)(&mut h.rsc).set_cursor_byte(0);
 
     for text in ["h", "i", " "] {
-        screen.composer.field.edit(&mut h.rsc).insert(text);
+        (screen.composer.field)(&mut h.rsc).insert(text);
         h.frame(PHONE_FRAME_MS);
     }
 
-    assert_eq!(screen.composer.field.edit(&mut h.rsc).text.text(), "hi ");
+    assert_eq!(&*(screen.composer.field)(&mut h.rsc).text(), "hi ");
     let region = h
         .rsc
         .ui
@@ -232,9 +232,9 @@ fn a_newline_leaves_the_caret_inside_the_composers_padding() {
     h.frame(PHONE_FRAME_MS * 2);
 
     h.state.set_focus(Some(screen.composer.field));
-    screen.composer.field.edit(&mut h.rsc).set_cursor_byte(0);
+    (screen.composer.field)(&mut h.rsc).set_cursor_byte(0);
     for _ in 0..12 {
-        screen.composer.field.edit(&mut h.rsc).insert("a\n");
+        (screen.composer.field)(&mut h.rsc).insert("a\n");
         h.frame(PHONE_FRAME_MS);
     }
     let render_handle = h.rsc.ui.render_state();

docs/LAYOUT.md

@@ -279,9 +279,9 @@ rasteriser (`TextData::place`, which reads back whatever `shape` set) is
 the display's *physical* size, and the glyph atlas holds a bitmap at the
 resolution it is actually shown at. `GlyphKey.size` already keys on the
 resolved size, so a cache entry is naturally per-physical-size with no
-further change. The one caller with no `Painter` to read density from
+further change. The callers with no `Painter` to read density from (cursor
-(`TextEditCtx::layout`, cursor movement and hit-testing) reads a second
+movement and hit-testing through `TextHandle::layout`) read a second copy kept
-copy kept directly on `TextData` (`TextData::density`) instead — an
+directly on `TextData` (`TextData::density`) instead — an
 accepted duplication rather than threading a `Painter` into every input
 handler for one field, the same tradeoff `AndroidRenderer::content_scale`
 already makes for the Diagnostics page.

docs/PLAN.md

@@ -814,13 +814,18 @@ private implementations of that wake; applications do not define platform
 event types or manually request redraws.
 
 **Iris ships no fonts, and font families are application-named strings**
-(2026-09-12). Applications register their own font bytes on `Ui` before the
+(2026-09-12). Applications register their own font bytes on `Ui` and select
-first text shape and select them by the same string used by text widgets. The
+them by the same string used by text widgets. The public boundaries accept
-public boundaries accept `AsRef<str>`, so an application can use bare strings
+`AsRef<str>`, so an application can use bare strings or put its own semantic
-or put its own semantic enum in front of them without Iris hardcoding the
+enum in front of them without Iris hardcoding the roles. Text buffers, layouts,
-roles. ai-app owns the `ai-app-icons` family, its Nerd Fonts subset, its
+and prepared glyphs live in a per-`Ui` generational arena; a text widget holds
-codepoints, its license and the script that rebuilds it; the CSS generic names
+one compact handle into it, while the arena and its shaping state are shared by
-`sans-serif` and `monospace` continue to resolve through the platform.
+one `Rc<RefCell<_>>`. Registering another family invalidates the live arena
+entries and dirties their active owner widgets, so registration is also valid
+after the first shape. ai-app owns the `ai-app-icons` family, its Nerd Fonts
+subset, its codepoints, its license and the script that rebuilds it; the CSS
+generic names `sans-serif` and `monospace` continue to resolve through the
+platform.
 
 `cargo-iris` is an installable Cargo subcommand, rather than a script callers
 must find inside an Iris checkout. `cargo iris apk` builds the Rust `cdylib`

iris/benches/message_list.rs

@@ -21,9 +21,10 @@ exists only to give a row enough text to wrap across several lines at a \
 typical phone column width.";
 
 fn build_row(rsc: &mut BenchRsc, i: usize, image_every: usize) -> StrongWidget {
-    let mut text = Text::new(format!("Message {i}: {BODY}"));
+    let text = wtext(format!("Message {i}: {BODY}"))
-    text.wrap = true;
+        .wrap(true)
-    let text = rsc.ui.widgets.add_strong(text).any();
+        .add_strong(rsc)
+        .any();
 
     if image_every > 0 && i.is_multiple_of(image_every) {
         let img = image::DynamicImage::new_rgba8(64, 64);
@@ -321,9 +322,7 @@ fn bench_redraw_big_text(chars: usize, redraws: usize) {
     let content: String = (0..chars)
         .map(|i| char::from(b'a' + (i % 26) as u8))
         .collect();
-    let mut text = Text::new(content);
+    let text = wtext(content).wrap(true).add_strong(&mut rsc);
-    text.wrap = true;
-    let text = rsc.ui.widgets.add_strong(text);
     let handle = text.weak();
     let root = text.any();
 

iris/core/src/primitive/text.rs

@@ -1,10 +1,23 @@
-use crate::{Align, GlyphAtlas, GlyphKey, PaintId, PlacedGlyph, RegionAlign, Textures, util::Vec2};
+use crate::{
+    Align, GlyphAtlas, GlyphKey, PaintId, PlacedGlyph, RegionAlign, Textures, WidgetId,
+    util::{SlotId, SlotVec, Vec2},
+};
 use parley::{
     Alignment, AlignmentOptions, FontContext, FontFamily, FontStyle, FontWeight, GenericFamily,
     Layout, LayoutContext, LineHeight, PositionedLayoutItem, StyleProperty,
     fontique::{Blob, FontInfoOverride},
 };
-use std::{collections::HashMap, fmt, ops::Range, sync::Arc};
+use std::{
+    cell::{Ref, RefCell},
+    collections::HashMap,
+    fmt,
+    ops::{Deref, DerefMut, Range},
+    rc::Rc,
+    sync::{
+        Arc,
+        mpsc::{Receiver, Sender, channel},
+    },
+};
 use swash::{
     FontRef,
     scale::{Render, ScaleContext, Source, StrikeWith},
@@ -25,7 +38,6 @@ pub struct FontDiagnostics {
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub enum FontRegistrationError {
     AlreadyRegistered(String),
-    TextAlreadyShaped,
     InvalidFont(String),
 }
 
@@ -35,10 +47,6 @@ impl fmt::Display for FontRegistrationError {
             Self::AlreadyRegistered(family) => {
                 write!(f, "font data is already registered for {family:?}")
             }
-            Self::TextAlreadyShaped => write!(
-                f,
-                "cannot register font data after text has been shaped; register application fonts before the first draw"
-            ),
             Self::InvalidFont(family) => {
                 write!(
                     f,
@@ -57,10 +65,9 @@ pub struct TextData {
     scale_cx: ScaleContext,
     pub atlas: GlyphAtlas,
     /// Physical pixels per dp -- a second copy of
-    /// `UiRenderState::density`, kept here too because `TextEditCtx::layout`
+    /// `UiRenderState::density`, kept here too because cursor movement and
-    /// (cursor movement and hit-testing, `widget/text/edit.rs`) shapes text
+    /// hit-testing shape text from event callbacks that have no `Painter`,
-    /// from an event callback that has a `TextData` but no `Painter`, so it
+    /// so they have nowhere else to read the display's density from. Both copies are
-    /// has nowhere else to read the display's density from. Both copies are
     /// set together, from the one place either backend learns the real
     /// value (`android::view::new_peer`); this is the same accepted
     /// duplication as `AndroidRenderer::content_scale`; a single source of
@@ -69,7 +76,6 @@ pub struct TextData {
     pub density: f32,
     registered_families: HashMap<String, String>,
     next_registered_family: u64,
-    shaping_started: bool,
 }
 
 impl Default for TextData {
@@ -84,7 +90,6 @@ impl Default for TextData {
             density: 1.0,
             registered_families: HashMap::new(),
             next_registered_family: 0,
-            shaping_started: false,
         }
     }
 }
@@ -168,9 +173,6 @@ impl TextData {
         data: impl AsRef<[u8]> + Send + Sync + 'static,
     ) -> Result<(), FontRegistrationError> {
         let family = family.as_ref().to_owned();
-        if self.shaping_started {
-            return Err(FontRegistrationError::TextAlreadyShaped);
-        }
         if self.registered_families.contains_key(&family) {
             return Err(FontRegistrationError::AlreadyRegistered(family));
         }
@@ -523,7 +525,6 @@ impl TextBuffer {
         width: Option<f32>,
         density: f32,
     ) {
-        data.shaping_started = true;
         if self.shaped.as_ref() == Some(&(attrs.clone(), width, density)) {
             return;
         }
@@ -574,6 +575,10 @@ impl TextBuffer {
             .align(Alignment::Start, AlignmentOptions::default());
         self.shaped = Some((attrs.clone(), width, density));
     }
+
+    fn invalidate(&mut self) {
+        self.shaped = None;
+    }
 }
 
 fn hash_coords(coords: &[i16]) -> u64 {
@@ -605,6 +610,261 @@ pub struct RenderedText {
     pub generation: u64,
 }
 
+pub struct TextResource {
+    buffer: TextBuffer,
+    attrs: TextAttrs,
+    rendered: Option<RenderedText>,
+    width: Option<f32>,
+    density: f32,
+    owner: Option<WidgetId>,
+}
+
+impl TextResource {
+    fn new(buffer: TextBuffer, attrs: TextAttrs) -> Self {
+        Self {
+            buffer,
+            attrs,
+            rendered: None,
+            width: None,
+            density: 0.0,
+            owner: None,
+        }
+    }
+
+    fn invalidate(&mut self) {
+        self.buffer.invalidate();
+        self.rendered = None;
+    }
+}
+
+/// All text storage and shaping state for one [`crate::Ui`]. Widgets retain a
+/// compact [`TextHandle`] into this arena rather than owning Parley layouts.
+pub struct TextResources {
+    data: TextData,
+    entries: SlotVec<TextResource>,
+    send: Sender<SlotId>,
+    recv: Receiver<SlotId>,
+}
+
+impl TextResources {
+    pub fn new() -> Self {
+        let (send, recv) = channel();
+        Self {
+            data: TextData::default(),
+            entries: SlotVec::new(),
+            send,
+            recv,
+        }
+    }
+
+    pub fn add(resources: Rc<RefCell<Self>>, buffer: TextBuffer, attrs: TextAttrs) -> TextHandle {
+        let (id, send) = {
+            let mut resources = resources.borrow_mut();
+            resources.free_released();
+            let id = resources.entries.add(TextResource::new(buffer, attrs));
+            (id, resources.send.clone())
+        };
+        TextHandle {
+            id,
+            resources,
+            send,
+        }
+    }
+
+    fn entry(&self, id: SlotId) -> &TextResource {
+        self.entries
+            .get(id)
+            .expect("text resource handle points at a released slot")
+    }
+
+    fn entry_mut(&mut self, id: SlotId) -> &mut TextResource {
+        self.entries
+            .get_mut(id)
+            .expect("text resource handle points at a released slot")
+    }
+
+    pub fn free_released(&mut self) {
+        for id in self.recv.try_iter() {
+            self.entries.free(id);
+        }
+    }
+
+    pub fn invalidate_all(&mut self) -> Vec<WidgetId> {
+        let mut owners = Vec::new();
+        for resource in self.entries.values_mut() {
+            resource.invalidate();
+            if let Some(owner) = resource.owner
+                && !owners.contains(&owner)
+            {
+                owners.push(owner);
+            }
+        }
+        owners
+    }
+
+    fn shape(&mut self, id: SlotId) {
+        let density = self.data.density;
+        let Self { data, entries, .. } = self;
+        let resource = entries
+            .get_mut(id)
+            .expect("text resource handle points at a released slot");
+        resource
+            .buffer
+            .shape(data, &resource.attrs, resource.width, density);
+    }
+
+    fn render(
+        &mut self,
+        id: SlotId,
+        width: Option<f32>,
+        owner: WidgetId,
+        textures: &mut Textures,
+        density: f32,
+    ) -> (RenderedText, bool) {
+        let atlas_generation = self.data.atlas.generation();
+        let resource = self.entry_mut(id);
+        resource.owner = Some(owner);
+        if resource.width == width
+            && resource.density == density
+            && let Some(rendered) = &resource.rendered
+            && rendered.generation == atlas_generation
+        {
+            return (rendered.clone(), false);
+        }
+        resource.width = width;
+        resource.density = density;
+        let Self { data, entries, .. } = self;
+        let resource = entries
+            .get_mut(id)
+            .expect("text resource handle points at a released slot");
+        let rendered = data.render(
+            &mut resource.buffer,
+            &resource.attrs,
+            width,
+            textures,
+            density,
+        );
+        resource.rendered = Some(rendered.clone());
+        (rendered, true)
+    }
+}
+
+impl Default for TextResources {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl Deref for TextResources {
+    type Target = TextData;
+
+    fn deref(&self) -> &Self::Target {
+        &self.data
+    }
+}
+
+impl DerefMut for TextResources {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        &mut self.data
+    }
+}
+
+/// A widget-owned reference to one entry in [`TextResources`]. The arena is
+/// shared once per UI; constructing a handle does not allocate a resource of
+/// its own.
+pub struct TextHandle {
+    id: SlotId,
+    resources: Rc<RefCell<TextResources>>,
+    send: Sender<SlotId>,
+}
+
+impl TextHandle {
+    pub fn text(&self) -> Ref<'_, str> {
+        Ref::map(self.resources.borrow(), |resources| {
+            resources.entry(self.id).buffer.text()
+        })
+    }
+
+    pub fn attrs(&self) -> Ref<'_, TextAttrs> {
+        Ref::map(self.resources.borrow(), |resources| {
+            &resources.entry(self.id).attrs
+        })
+    }
+
+    pub fn set_text(&mut self, text: impl Into<String>) -> bool {
+        let text = text.into();
+        let mut resources = self.resources.borrow_mut();
+        let resource = resources.entry_mut(self.id);
+        if resource.buffer.text() == text {
+            return false;
+        }
+        resource.buffer.set_text(text);
+        resource.rendered = None;
+        true
+    }
+
+    pub fn edit_text<R>(&mut self, edit: impl FnOnce(&mut String) -> R) -> R {
+        let mut resources = self.resources.borrow_mut();
+        let resource = resources.entry_mut(self.id);
+        resource.rendered = None;
+        edit(resource.buffer.edit())
+    }
+
+    pub fn set_spans(&mut self, spans: Vec<SpanStyle>) {
+        let mut resources = self.resources.borrow_mut();
+        let resource = resources.entry_mut(self.id);
+        resource.buffer.set_spans(spans);
+        resource.rendered = None;
+    }
+
+    pub fn update_attrs<R>(&mut self, update: impl FnOnce(&mut TextAttrs) -> R) -> R {
+        let mut resources = self.resources.borrow_mut();
+        let resource = resources.entry_mut(self.id);
+        resource.invalidate();
+        update(&mut resource.attrs)
+    }
+
+    pub fn rendered(&self) -> Option<RenderedText> {
+        self.resources.borrow().entry(self.id).rendered.clone()
+    }
+
+    pub fn width(&self) -> Option<f32> {
+        self.resources.borrow().entry(self.id).width
+    }
+
+    pub fn with_layout<R>(&self, f: impl FnOnce(&Layout<PaintId>, &str) -> R) -> R {
+        let mut resources = self.resources.borrow_mut();
+        resources.shape(self.id);
+        let resource = resources.entry(self.id);
+        f(resource.buffer.layout(), resource.buffer.text())
+    }
+
+    pub fn layout(&self) -> Ref<'_, Layout<PaintId>> {
+        self.resources.borrow_mut().shape(self.id);
+        Ref::map(self.resources.borrow(), |resources| {
+            resources.entry(self.id).buffer.layout()
+        })
+    }
+
+    pub fn render(
+        &self,
+        width: Option<f32>,
+        owner: WidgetId,
+        textures: &mut Textures,
+        density: f32,
+    ) -> (RenderedText, bool) {
+        self.resources
+            .borrow_mut()
+            .render(self.id, width, owner, textures, density)
+    }
+}
+
+impl Drop for TextHandle {
+    fn drop(&mut self) {
+        let _ = self.send.send(self.id);
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -619,13 +879,18 @@ mod tests {
     }
 
     #[test]
-    fn registering_after_shaping_is_reported() {
+    fn dropped_handles_release_their_arena_entries() {
-        let mut data = TextData::default();
+        let resources = Rc::new(RefCell::new(TextResources::new()));
-        let mut buffer = TextBuffer::new("ordinary platform text");
+        let text = TextResources::add(
-        buffer.shape(&mut data, &TextAttrs::default(), None, 1.0);
+            resources.clone(),
-        assert_eq!(
+            TextBuffer::new("temporary"),
-            data.register_font("icons", b"not a font" as &'static [u8]),
+            TextAttrs::default(),
-            Err(FontRegistrationError::TextAlreadyShaped)
         );
+        assert_eq!(resources.borrow().entries.len(), 1);
+
+        drop(text);
+        resources.borrow_mut().free_released();
+
+        assert!(resources.borrow().entries.is_empty());
     }
 }

iris/core/src/ui/mod.rs

@@ -1,5 +1,6 @@
 use crate::{
-    Mask, MoveOffset, Paints, TextData, Textures, WeakWidget, WidgetId, Widgets, util::TrackedArena,
+    Mask, MoveOffset, Paints, TextResources, Textures, WeakWidget, WidgetId, Widgets,
+    util::TrackedArena,
 };
 use std::{
     cell::{Ref, RefCell, RefMut},
@@ -22,7 +23,7 @@ pub struct UiData {
     pub widgets: Widgets,
     pub paints: Paints,
     pub textures: Textures,
-    pub text: TextData,
+    pub text: Rc<RefCell<TextResources>>,
     pub masks: TrackedArena<Mask, u32>,
     pub move_offsets: TrackedArena<MoveOffset, u32>,
     animating: Vec<WidgetId>,
@@ -67,21 +68,32 @@ pub struct Ui {
 
 impl Ui {
     /// Register application-owned font data for a semantic or named family.
-    ///
+    /// Existing text resources are invalidated and their active widgets are
-    /// This must happen before the first text shape. Existing text layouts
+    /// scheduled for layout again.
-    /// cache their resolved faces, so accepting a later registration would
-    /// leave already-shaped widgets displaying the old result.
     #[track_caller]
     pub fn register_font(
         &mut self,
         family: impl AsRef<str>,
         data: impl AsRef<[u8]> + Send + Sync + 'static,
     ) -> Result<(), crate::FontRegistrationError> {
-        self.data.text.register_font(family, data)
+        let owners = {
+            let mut text = self.data.text.borrow_mut();
+            text.register_font(family, data)?;
+            text.invalidate_all()
+        };
+        let active: Vec<WidgetId> = {
+            let render = self.render_state.get();
+            owners
+                .into_iter()
+                .filter(|owner| render.active.contains_key(owner))
+                .collect()
+        };
+        self.data.widgets.needs_redraw.extend(active);
+        Ok(())
     }
 
     pub fn is_font_registered(&self, family: impl AsRef<str>) -> bool {
-        self.data.text.is_font_registered(family)
+        self.data.text.borrow().is_font_registered(family)
     }
 
     /// A read-only handle to the retained result of the last completed frame.
@@ -96,7 +108,7 @@ impl Ui {
     }
 
     pub fn set_density(&mut self, density: f32) {
-        self.data.text.density = density;
+        self.data.text.borrow_mut().density = density;
         self.render_state.get_mut().set_density(density);
     }
 }
@@ -172,5 +184,6 @@ pub trait UiRsc {
         }
         self.ui_mut().textures.free();
         self.ui_mut().paints.free_released();
+        self.ui_mut().text.borrow_mut().free_released();
     }
 }

iris/core/src/ui/painter.rs

@@ -1,6 +1,6 @@
 use crate::{
-    Axis, Len, MoveOffset, PaintId, RegionAlign, RenderedText, Size, StrongWidget, TextAttrs,
+    Axis, Len, MoveOffset, PaintId, RegionAlign, RenderedText, Size, StrongWidget, TextHandle,
-    TextBuffer, TextData, TextureHandle, UiData, UiRegion, UiRenderState, UiRsc, UiScalar, UiVec2,
+    TextResources, TextureHandle, UiData, UiRegion, UiRenderState, UiRsc, UiScalar, UiVec2,
     WidgetId,
     render::{
         Drawn, GlyphPrimitive, IMAGE_BINDING, Mask, MaskIdx, MoveIdx, NOT_DRAWN, Primitive,
@@ -9,6 +9,7 @@ use crate::{
     ui::render_state::Retained,
     util::Vec2,
 };
+use std::{cell::RefCell, rc::Rc};
 
 pub struct Painter<'a> {
     pub(super) render_state: &'a mut UiRenderState,
@@ -413,21 +414,16 @@ impl<'a> Painter<'a> {
         self.own(h);
     }
 
-    pub fn render_text(
+    pub fn render_text(&mut self, text: &TextHandle, width: Option<f32>) -> RenderedText {
-        &mut self,
-        buffer: &mut TextBuffer,
-        attrs: &TextAttrs,
-        width: Option<f32>,
-    ) -> RenderedText {
         let density = self.render_state.density;
-        self.render_state.shape_count += 1;
         let ui: &mut UiData = self.rsc.ui_mut();
-        ui.text
+        let (rendered, prepared) = text.render(width, self.id, &mut ui.textures, density);
-            .render(buffer, attrs, width, &mut ui.textures, density)
+        self.render_state.shape_count += u64::from(prepared);
+        rendered
     }
 
-    pub fn atlas_generation(&mut self) -> u64 {
+    fn atlas_generation(&self) -> u64 {
-        self.rsc.ui_mut().text.atlas.generation()
+        self.rsc.ui().text.borrow().atlas.generation()
     }
 
     pub fn glyphs(&mut self, text: &RenderedText, origin: UiRegion) {
@@ -493,8 +489,8 @@ impl<'a> Painter<'a> {
         self.region.size().to_abs(self.render_state.output_size)
     }
 
-    pub fn text_data(&mut self) -> &mut TextData {
+    pub fn text_resources(&mut self) -> Rc<RefCell<TextResources>> {
-        &mut self.rsc.ui_mut().text
+        self.rsc.ui().text.clone()
     }
 
     pub fn child_layer(&mut self) {

iris/core/src/util/slot.rs

@@ -71,6 +71,10 @@ impl<T> SlotVec<T> {
     pub fn is_empty(&self) -> bool {
         self.len() == 0
     }
+
+    pub fn values_mut(&mut self) -> impl Iterator<Item = &mut T> {
+        self.data.iter_mut().filter_map(|(_, value)| value.as_mut())
+    }
 }
 
 impl<T> Default for SlotVec<T> {

iris/examples/tabs/lib.rs

@@ -8,8 +8,8 @@ pub(crate) fn update_info<Rsc: UiRsc>(rsc: &mut Rsc, info: WeakWidget<Text>, vie
         rsc.widgets().len(),
         render_state.get().active_widgets(),
     );
-    if new != *rsc.widgets()[info].content {
+    if new != rsc.widgets()[info].content() {
-        *rsc.widgets_mut()[info].content = new;
+        rsc.widgets_mut()[info].set_text(new);
     }
 }
 
@@ -118,7 +118,7 @@ where
         .attr::<Selectable>(())
         .on(Submit, move |ctx, rsc: &mut Rsc| {
             let w = ctx.widget;
-            let content = w.edit(rsc).take();
+            let content = w(rsc).take();
             let text = wtext(content)
                 .editable(EditMode::MultiLine)
                 .size(30)

iris/readme.md

@@ -59,7 +59,7 @@ the retained widget tree dirty:
 ```rust
 rsc.spawn_task(async move |mut ctx| {
     let text = load_text().await;
-    ctx.update(move |_, rsc| label.edit(rsc).set(&text));
+    ctx.update(move |_, rsc| label(rsc).set(&text));
 });
 ```
 

iris/src/android/ime.rs

@@ -43,11 +43,11 @@ impl<State: AndroidAppState> IrisViewPeer<State> {
             return;
         };
         let content = text.text();
-        let sel_start = byte_to_utf16(content, sel.start) as i32;
+        let sel_start = byte_to_utf16(&content, sel.start) as i32;
-        let sel_end = byte_to_utf16(content, sel.end) as i32;
+        let sel_end = byte_to_utf16(&content, sel.end) as i32;
         let compose_len = self.state.android_state().compose_len;
         let (comp_start, comp_end) = if compose_len > 0 {
-            let caret = byte_to_utf16(content, text.caret().unwrap_or(sel.end)) as i32;
+            let caret = byte_to_utf16(&content, text.caret().unwrap_or(sel.end)) as i32;
             (caret - compose_len as i32, caret)
         } else {
             (-1, -1)
@@ -89,16 +89,12 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
         if let Some(focus) = self.focus() {
             let text = focus.get(&self.rsc);
             let sel = text.selection_range().unwrap_or(0..0);
-            let start = byte_to_utf16(text.text(), sel.start) as i32;
+            let content = text.text();
-            let end = byte_to_utf16(text.text(), sel.end) as i32;
+            let start = byte_to_utf16(&content, sel.start) as i32;
+            let end = byte_to_utf16(&content, sel.end) as i32;
             out_attrs.set_initial_sel_start(&mut ctx.env, start);
             out_attrs.set_initial_sel_end(&mut ctx.env, end);
-            let caps = caps_mode(
+            let caps = caps_mode(&mut ctx.env, &content, start as usize, CAP_MODE_SENTENCES);
-                &mut ctx.env,
-                text.text(),
-                start as usize,
-                CAP_MODE_SENTENCES,
-            );
             out_attrs.set_initial_caps_mode(&mut ctx.env, caps);
         }
     }
@@ -114,10 +110,11 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
         let focus = self.focus()?;
         let text = focus.get(&self.rsc);
         let sel = text.selection_range()?;
-        let end_16 = byte_to_utf16(text.text(), sel.start);
+        let content = text.text();
+        let end_16 = byte_to_utf16(&content, sel.start);
         let start_16 = end_16.saturating_sub(n as usize);
-        let start = utf16_to_byte(text.text(), start_16);
+        let start = utf16_to_byte(&content, start_16);
-        Some(Cow::Borrowed(&text.text()[start..sel.start]))
+        Some(Cow::Owned(content[start..sel.start].to_owned()))
     }
 
     fn text_after_cursor<'slf>(
@@ -131,11 +128,12 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
         let focus = self.focus()?;
         let text = focus.get(&self.rsc);
         let sel = text.selection_range()?;
-        let len_16 = byte_to_utf16(text.text(), text.text().len());
+        let content = text.text();
-        let start_16 = byte_to_utf16(text.text(), sel.end);
+        let len_16 = byte_to_utf16(&content, content.len());
+        let start_16 = byte_to_utf16(&content, sel.end);
         let end_16 = (start_16 + n as usize).min(len_16);
-        let end = utf16_to_byte(text.text(), end_16);
+        let end = utf16_to_byte(&content, end_16);
-        Some(Cow::Borrowed(&text.text()[sel.end..end]))
+        Some(Cow::Owned(content[sel.end..end].to_owned()))
     }
 
     fn selected_text<'slf>(&'slf mut self, _ctx: &mut CallbackCtx) -> Option<Cow<'slf, str>> {
@@ -151,8 +149,9 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
         let Some(caret) = text.caret() else {
             return 0;
         };
-        let off = byte_to_utf16(text.text(), caret);
+        let content = text.text();
-        caps_mode(&mut ctx.env, text.text(), off, req_modes)
+        let off = byte_to_utf16(&content, caret);
+        caps_mode(&mut ctx.env, &content, off, req_modes)
     }
 
     fn delete_surrounding_text(
@@ -170,12 +169,13 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
         };
         let content = text.text();
         let start_16 =
-            byte_to_utf16(content, sel.start).saturating_sub(before_length.max(0) as usize);
+            byte_to_utf16(&content, sel.start).saturating_sub(before_length.max(0) as usize);
-        let len_16 = byte_to_utf16(content, content.len());
+        let len_16 = byte_to_utf16(&content, content.len());
-        let end_16 = (byte_to_utf16(content, sel.end) + after_length.max(0) as usize).min(len_16);
+        let end_16 = (byte_to_utf16(&content, sel.end) + after_length.max(0) as usize).min(len_16);
-        let start = utf16_to_byte(content, start_16);
+        let start = utf16_to_byte(&content, start_16);
-        let end = utf16_to_byte(content, end_16);
+        let end = utf16_to_byte(&content, end_16);
-        focus.edit(&mut self.rsc).delete_byte_range(start, end);
+        drop(content);
+        focus(&mut self.rsc).delete_byte_range(start, end);
         self.after_input(ctx);
         true
     }
@@ -199,7 +199,7 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
             return false;
         };
         let compose_len = self.state.android_state().compose_len;
-        focus.edit(&mut self.rsc).replace(compose_len, text);
+        focus(&mut self.rsc).replace(compose_len, text);
         self.state.android_state_mut().compose_len = text.chars().count();
         self.after_input(ctx);
         true
@@ -225,8 +225,9 @@ impl<State: AndroidAppState> InputConnection for IrisViewPeer<State> {
         };
         let text = focus.get(&self.rsc);
         let content = text.text();
-        let byte = utf16_to_byte(content, end.max(0) as usize);
+        let byte = utf16_to_byte(&content, end.max(0) as usize);
-        focus.edit(&mut self.rsc).set_cursor_byte(byte);
+        drop(content);
+        focus(&mut self.rsc).set_cursor_byte(byte);
         let _ = start;
         self.after_input(ctx);
         true

iris/src/android/input.rs

@@ -19,7 +19,7 @@ pub(super) fn on_key<'local, State: AndroidAppState>(
     let Some(focus) = state.android_state().focus else {
         return false;
     };
-    let mut text = focus.edit(rsc);
+    let text = focus(rsc);
     match key_code {
         Keycode::Del => text.backspace(false),
         Keycode::ForwardDel => text.delete(false),

iris/src/android/view.rs

@@ -217,7 +217,7 @@ impl<State: AndroidAppState> IrisViewPeer<State> {
         if old_focus != ui_state.focus
             && let Some(old) = old_focus
         {
-            old.edit(&mut self.rsc).deselect();
+            old(&mut self.rsc).deselect();
         }
         if std::mem::take(&mut ui_state.pending_show_keyboard) {
             show_soft_input(&mut ctx.env, &ctx.view);
@@ -619,7 +619,7 @@ impl<State: AndroidAppState> ViewPeer for IrisViewPeer<State> {
         if !gain_focus {
             let ui_state = self.state.android_state_mut();
             if let Some(focus) = ui_state.focus.take() {
-                focus.edit(&mut self.rsc).deselect();
+                focus(&mut self.rsc).deselect();
             }
         }
         self.after_input(ctx);
@@ -646,8 +646,8 @@ impl<State: AndroidAppState> ViewPeer for IrisViewPeer<State> {
         log::info!(
             "iris surface: surface_changed {width}x{height} already_live={already_live} \
              glyphs_cached={} atlas_pages={}",
-            self.rsc.ui().text.atlas.glyph_count(),
+            self.rsc.ui().text.borrow().atlas.glyph_count(),
-            self.rsc.ui().text.atlas.page_count(),
+            self.rsc.ui().text.borrow().atlas.page_count(),
         );
         if already_live {
             let ui_state = self.state.android_state_mut();
@@ -691,8 +691,8 @@ impl<State: AndroidAppState> ViewPeer for IrisViewPeer<State> {
                     "iris surface: new renderer built ({:?}), re-uploading textures: \
                      glyphs={} pages={}",
                     renderer.adapter_backend,
-                    self.rsc.ui().text.atlas.glyph_count(),
+                    self.rsc.ui().text.borrow().atlas.glyph_count(),
-                    self.rsc.ui().text.atlas.page_count(),
+                    self.rsc.ui().text.borrow().atlas.page_count(),
                 );
                 self.rsc.ui_mut().textures.reupload();
                 self.rsc.ui_mut().paints.reupload();
@@ -716,8 +716,8 @@ impl<State: AndroidAppState> ViewPeer for IrisViewPeer<State> {
         log::info!(
             "iris surface: surface_destroyed, tearing the renderer down \
              (glyphs_cached={} atlas_pages={})",
-            self.rsc.ui().text.atlas.glyph_count(),
+            self.rsc.ui().text.borrow().atlas.glyph_count(),
-            self.rsc.ui().text.atlas.page_count(),
+            self.rsc.ui().text.borrow().atlas.page_count(),
         );
         self.state.android_state_mut().renderer = None;
     }

iris/src/desktop/mod.rs

@@ -250,7 +250,7 @@ impl<State: DesktopAppState> AppState for DesktopApp<State> {
         if old != ui_state.focus
             && let Some(old) = old
         {
-            old.edit(rsc).deselect();
+            old(rsc).deselect();
         }
         match &event {
             WindowEvent::CloseRequested => event_loop.exit(),
@@ -315,7 +315,7 @@ impl<State: DesktopAppState> AppState for DesktopApp<State> {
                     && let Some(sel) = ui_state.focus
                     && event.state.is_pressed()
                 {
-                    let mut text = sel.edit(rsc);
+                    let text = sel(rsc);
                     match text.apply_event(event, &ui_state.input.modifiers) {
                         TextInputResult::Unfocus => {
                             ui_state.focus = None;
@@ -346,7 +346,7 @@ impl<State: DesktopAppState> AppState for DesktopApp<State> {
                 if !rsc.events.controllers.command_target_blocks_input()
                     && let Some(sel) = ui_state.focus
                 {
-                    let mut text = sel.edit(rsc);
+                    let text = sel(rsc);
                     match ime {
                         Ime::Enabled | Ime::Disabled => (),
                         Ime::Preedit(content, _pos) => {

iris/src/layout_tests.rs

@@ -467,10 +467,8 @@ fn composing_text_after_a_keyboard_resize_lands_in_the_bars_own_region() {
 
     render.resize((1080.0, 2298.0));
     render.update(&root, &mut rsc);
-    field
+    field(&mut rsc).select(vec2(40.0, 2250.0), vec2(1080.0, 2298.0), false, false);
-        .edit(&mut rsc)
+    field(&mut rsc).insert("a");
-        .select(vec2(40.0, 2250.0), vec2(1080.0, 2298.0), false, false);
-    field.edit(&mut rsc).insert("a");
     render.update(&root, &mut rsc);
 
     let before_px = render.window_region(&field, &rsc).unwrap();
@@ -485,7 +483,7 @@ fn composing_text_after_a_keyboard_resize_lands_in_the_bars_own_region() {
 
     render.resize((1080.0, 1478.0));
     render.update(&root, &mut rsc);
-    field.edit(&mut rsc).insert("b");
+    field(&mut rsc).insert("b");
     render.update(&root, &mut rsc);
 
     let after_px = render.window_region(&field, &rsc).unwrap();

iris/src/rsc/attr.rs

@@ -127,29 +127,29 @@ fn on_press(
         match sense {
             CursorSense::PressStart(_) => {
                 let recent = state.recent_click();
-                id.edit(rsc).text.press_origin = Some(pos);
+                id(rsc).press_origin = Some(pos);
-                id.edit(rsc).select(pos, size, false, recent);
+                id(rsc).select(pos, size, false, recent);
             }
             CursorSense::Pressing(_) | CursorSense::PressEnd(_) => {
-                let mut ctx = id.edit(rsc);
+                let ctx = id(rsc);
-                let Some(origin) = ctx.text.press_origin else {
+                let Some(origin) = ctx.press_origin else {
                     return;
                 };
                 let (dx, dy) = (pos.x - origin.x, pos.y - origin.y);
                 if dy.abs() > DRAG_SLOP && dy.abs() >= dx.abs() {
-                    ctx.text.press_origin = None;
+                    ctx.press_origin = None;
                     return;
                 }
                 let ended = matches!(sense, CursorSense::PressEnd(_));
                 if ended {
-                    ctx.text.press_origin = None;
+                    ctx.press_origin = None;
                 }
                 ctx.select(pos, size, true, false);
                 if ended && dx.abs() <= DRAG_SLOP && dy.abs() <= DRAG_SLOP {
                     state.focus_gained(render.window_region(&id, &*rsc));
                 }
             }
-            CursorSense::Cancel => id.edit(rsc).text.press_origin = None,
+            CursorSense::Cancel => id(rsc).press_origin = None,
             _ => {}
         }
         return;
@@ -157,24 +157,24 @@ fn on_press(
 
     match sense {
         CursorSense::PressStart(_) => {
-            id.edit(rsc).text.press_origin = Some(pos);
+            id(rsc).press_origin = Some(pos);
         }
         CursorSense::Pressing(_) => {
-            let ctx = id.edit(rsc);
+            let ctx = id(rsc);
-            if let Some(origin) = ctx.text.press_origin
+            if let Some(origin) = ctx.press_origin
                 && ((pos.x - origin.x).abs() > DRAG_SLOP || (pos.y - origin.y).abs() > DRAG_SLOP)
             {
-                ctx.text.press_origin = None;
+                ctx.press_origin = None;
             }
         }
         // The gesture was taken by somebody else, so it is not a tap and
         // must not grant focus when it ends out of this widget's sight.
-        CursorSense::Cancel => id.edit(rsc).text.press_origin = None,
+        CursorSense::Cancel => id(rsc).press_origin = None,
         CursorSense::PressEnd(_) => {
-            let was_tap = id.edit(rsc).text.press_origin.take().is_some();
+            let was_tap = id(rsc).press_origin.take().is_some();
             if was_tap {
                 let recent = state.recent_click();
-                id.edit(rsc).select(pos, size, false, recent);
+                id(rsc).select(pos, size, false, recent);
                 state.set_focus(Some(id));
                 state.focus_gained(render.window_region(&id, &*rsc));
             }

iris/src/widget/text/build.rs

@@ -91,12 +91,10 @@ impl<Rsc: UiRsc> TextBuilderOutput<Rsc> for TextOutput {
         let mut buf = TextBuffer::new(&builder.content);
         buf.set_spans(builder.spans);
         let hint = builder.hint.get(state);
-        let mut text = Text {
+        let resources = state.ui().text.clone();
-            content: builder.content.into(),
+        Text {
-            view: TextView::new(buf, builder.attrs, hint),
+            view: TextView::new(TextResources::add(resources, buf, builder.attrs), hint),
-        };
+        }
-        text.content.changed = false;
-        text
     }
 }
 
@@ -113,8 +111,12 @@ impl<State: UiRsc> TextBuilderOutput<State> for TextEditOutput {
     ) -> Self::Output {
         let mut buf = TextBuffer::new(&builder.content);
         buf.set_spans(builder.spans);
+        let resources = state.ui().text.clone();
         TextEdit::new(
-            TextView::new(buf, builder.attrs, builder.hint.get(state)),
+            TextView::new(
+                TextResources::add(resources, buf, builder.attrs),
+                builder.hint.get(state),
+            ),
             builder.output.mode,
         )
     }

iris/src/widget/text/edit.rs

@@ -1,9 +1,10 @@
 use crate::prelude::*;
-use iris_core::{PaintId, TextData};
+use iris_core::PaintId;
 use parley::{Affinity, Layout, Selection};
-use std::ops::{Deref, DerefMut};
+use std::{
-
+    cell::Ref,
-use super::selection_layout;
+    ops::{Deref, DerefMut},
+};
 #[cfg(not(target_os = "android"))]
 use winit::{
     event::KeyEvent,
@@ -47,15 +48,15 @@ impl TextEdit {
     }
 
     pub fn selected_text(&self) -> Option<String> {
-        self.view.selection.selected_text(self.view.buf.text())
+        self.view.selection.selected_text(&self.view.text.text())
     }
 
     /// The field's content. Byte-indexed, like everything else here since
     /// I1 moved to parley -- an IME bridge (`android/ime.rs`) converts to
     /// and from UTF-16 code units at its own edge rather than this type
     /// knowing about that encoding.
-    pub fn text(&self) -> &str {
+    pub fn text(&self) -> Ref<'_, str> {
-        self.view.buf.text()
+        self.view.text.text()
     }
 
     /// The selection as a byte range, collapsed to `caret..caret` when
@@ -89,21 +90,15 @@ impl Widget for TextEdit {
     }
 }
 
-pub struct TextEditCtx<'a> {
+impl TextEdit {
-    pub text: &'a mut TextEdit,
-    pub data: &'a mut TextData,
-}
-
-impl<'a> TextEditCtx<'a> {
     fn selection_ctx(&mut self) -> TextSelectionCtx<'_> {
         TextSelectionCtx {
-            view: &mut self.text.view,
+            view: &mut self.view,
-            data: self.data,
         }
     }
 
-    fn layout(&mut self) -> &Layout<iris_core::PaintId> {
+    fn layout(&self) -> Ref<'_, Layout<iris_core::PaintId>> {
-        selection_layout(&mut self.text.view, self.data)
+        self.view.text.layout()
     }
 
     #[cfg_attr(target_os = "android", allow(dead_code))]
@@ -112,44 +107,44 @@ impl<'a> TextEditCtx<'a> {
     }
 
     pub fn take(&mut self) -> String {
-        let text = self.text.view.buf.text().to_string();
+        let text = self.view.text.text().to_string();
         self.set("");
         text
     }
 
     pub fn set(&mut self, text: &str) {
         let text = self.string(text);
-        self.text.view.buf.set_text(text);
+        self.view.text.set_text(text);
-        self.text.view.buf.changed = true;
+        self.view.selection.deselect();
-        self.text.view.selection.deselect();
     }
 
     pub fn set_with_spans(&mut self, text: &str, spans: Vec<SpanStyle>) {
         let text = self.string(text);
-        self.text.view.buf.set_text(text);
+        self.view.text.set_text(text);
-        self.text.view.buf.set_spans(spans);
+        self.view.text.set_spans(spans);
-        self.text.view.selection.deselect();
+        self.view.selection.deselect();
     }
 
     pub fn motion(&mut self, motion: Motion, select: bool) {
-        let Some(sel) = self.text.view.selection.range else {
+        let Some(sel) = self.view.selection.range else {
             return;
         };
         let layout = self.layout();
         let sel = if !select && !sel.is_collapsed() {
             match motion {
                 Motion::Left | Motion::LeftWord => {
-                    Selection::from(sel.text_range().start_cursor(layout))
+                    Selection::from(sel.text_range().start_cursor(&layout))
                 }
                 Motion::Right | Motion::RightWord => {
-                    Selection::from(sel.text_range().end_cursor(layout))
+                    Selection::from(sel.text_range().end_cursor(&layout))
                 }
-                _ => apply_motion(sel, layout, motion, false),
+                _ => apply_motion(sel, &layout, motion, false),
             }
         } else {
-            apply_motion(sel, layout, motion, select)
+            apply_motion(sel, &layout, motion, select)
         };
-        self.text.view.selection.range = Some(sel);
+        drop(layout);
+        self.view.selection.range = Some(sel);
     }
 
     pub fn replace(&mut self, len: usize, text: &str) {
@@ -161,7 +156,7 @@ impl<'a> TextEditCtx<'a> {
     }
 
     fn string(&self, text: &str) -> String {
-        if self.text.mode == EditMode::SingleLine {
+        if self.mode == EditMode::SingleLine {
             text.replace('\n', "")
         } else {
             text.to_string()
@@ -178,7 +173,7 @@ impl<'a> TextEditCtx<'a> {
             return;
         }
         self.clear_span();
-        let at = match self.text.view.selection.range {
+        let at = match self.view.selection.range {
             Some(sel) => sel.focus().index(),
             // No caret means nowhere to put the text, so this drops the
             // keystroke -- which is invisible, and was the whole of the
@@ -196,22 +191,24 @@ impl<'a> TextEditCtx<'a> {
                 return;
             }
         };
-        let at = at.min(self.text.view.buf.text().len());
+        let at = at.min(self.view.text.text().len());
-        self.text.view.buf.edit().insert_str(at, text);
+        self.view
-        self.text.view.buf.changed = true;
+            .text
+            .edit_text(|content| content.insert_str(at, text));
         self.set_caret(at + text.len());
     }
 
     pub fn clear_span(&mut self) -> bool {
-        let Some(sel) = self.text.view.selection.range else {
+        let Some(sel) = self.view.selection.range else {
             return false;
         };
         if sel.is_collapsed() {
             return false;
         }
         let range = sel.text_range();
-        self.text.view.buf.edit().replace_range(range.clone(), "");
+        self.view
-        self.text.view.buf.changed = true;
+            .text
+            .edit_text(|content| content.replace_range(range.clone(), ""));
         self.set_caret(range.start);
         true
     }
@@ -221,7 +218,7 @@ impl<'a> TextEditCtx<'a> {
     }
 
     pub fn newline(&mut self) {
-        if self.text.mode == EditMode::MultiLine {
+        if self.mode == EditMode::MultiLine {
             self.insert_str("\n");
         }
     }
@@ -230,7 +227,7 @@ impl<'a> TextEditCtx<'a> {
         if self.clear_span() {
             return;
         }
-        let Some(sel) = self.text.view.selection.range else {
+        let Some(sel) = self.view.selection.range else {
             return;
         };
         let end = sel.focus().index();
@@ -239,10 +236,11 @@ impl<'a> TextEditCtx<'a> {
         }
         let layout = self.layout();
         let start = if word {
-            sel.focus().previous_logical_word(layout).index()
+            sel.focus().previous_logical_word(&layout).index()
         } else {
-            sel.focus().previous_visual(layout).index()
+            sel.focus().previous_visual(&layout).index()
         };
+        drop(layout);
         self.delete_range(start, end);
     }
 
@@ -250,30 +248,32 @@ impl<'a> TextEditCtx<'a> {
         if self.clear_span() {
             return;
         }
-        let Some(sel) = self.text.view.selection.range else {
+        let Some(sel) = self.view.selection.range else {
             return;
         };
         let start = sel.focus().index();
-        if start >= self.text.view.buf.text().len() {
+        if start >= self.view.text.text().len() {
             return;
         }
         let layout = self.layout();
         let end = if word {
-            sel.focus().next_logical_word(layout).index()
+            sel.focus().next_logical_word(&layout).index()
         } else {
-            sel.focus().next_visual(layout).index()
+            sel.focus().next_visual(&layout).index()
         };
+        drop(layout);
         self.delete_range(start, end);
     }
 
     fn delete_range(&mut self, start: usize, end: usize) {
-        let len = self.text.view.buf.text().len();
+        let len = self.view.text.text().len();
         let (start, end) = (start.min(end).min(len), start.max(end).min(len));
         if start == end {
             return;
         }
-        self.text.view.buf.edit().replace_range(start..end, "");
+        self.view
-        self.text.view.buf.changed = true;
+            .text
+            .edit_text(|content| content.replace_range(start..end, ""));
         self.set_caret(start);
     }
 
@@ -326,20 +326,17 @@ impl<'a> TextEditCtx<'a> {
 
     #[cfg(not(target_os = "android"))]
     pub fn apply_event(&mut self, event: &KeyEvent, modifiers: &Modifiers) -> TextInputResult {
-        let old = (
+        let old = (self.view.text.text().to_string(), self.view.selection.range);
-            self.text.view.buf.text().to_string(),
-            self.text.view.selection.range,
-        );
         let mut undo = false;
         let res = self.apply_event_inner(event, modifiers, &mut undo);
         if undo {
-            if let Some((old, selection)) = self.text.history.pop() {
+            if let Some((old, selection)) = self.history.pop() {
                 self.set(&old);
-                self.text.view.selection.range = selection;
+                self.view.selection.range = selection;
                 self.refresh();
             }
-        } else if self.text.view.buf.text() != old.0 {
+        } else if self.view.text.text().as_ref() != old.0 {
-            self.text.history.push(old);
+            self.history.push(old);
         }
         res
     }
@@ -394,12 +391,12 @@ impl<'a> TextEditCtx<'a> {
                     match text.as_str() {
                         "v" => return TextInputResult::Paste,
                         "c" => {
-                            if let Some(content) = self.text.selected_text() {
+                            if let Some(content) = self.selected_text() {
                                 return TextInputResult::Copy(content);
                             }
                         }
                         "x" => {
-                            if let Some(content) = self.text.selected_text() {
+                            if let Some(content) = self.selected_text() {
                                 self.clear_span();
                                 return TextInputResult::Copy(content);
                             }
@@ -492,226 +489,213 @@ impl DerefMut for TextEdit {
     }
 }
 
-pub trait TextEditable {
-    fn edit<'a>(&self, ui: &'a mut impl UiRsc) -> TextEditCtx<'a>;
-}
-
-impl<I: IdLike<Widget = TextEdit>> TextEditable for I {
-    fn edit<'a>(&self, ui: &'a mut impl UiRsc) -> TextEditCtx<'a> {
-        let ui: &mut UiData = ui.ui_mut();
-        TextEditCtx {
-            text: ui.widgets.get_mut(self).unwrap(),
-            data: &mut ui.text,
-        }
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use super::*;
-    use iris_core::{TextAttrs, TextBuffer};
+    use iris_core::{TextAttrs, TextBuffer, TextResources};
 
-    fn edit(text: &str, mode: EditMode) -> (TextEdit, TextData) {
+    fn edit(text: &str, mode: EditMode) -> TextEdit {
-        let view = TextView::new(TextBuffer::new(text), TextAttrs::default(), None);
+        let resources = std::rc::Rc::new(std::cell::RefCell::new(TextResources::default()));
-        (TextEdit::new(view, mode), TextData::default())
+        let handle = TextResources::add(resources, TextBuffer::new(text), TextAttrs::default());
+        TextEdit::new(TextView::new(handle, None), mode)
     }
 
-    fn ctx<'a>(text: &'a mut TextEdit, data: &'a mut TextData) -> TextEditCtx<'a> {
+    fn ctx(text: &mut TextEdit) -> &mut TextEdit {
-        TextEditCtx { text, data }
+        text
     }
 
     fn content(text: &TextEdit) -> String {
-        text.buf.text().to_string()
+        text.text().to_string()
     }
 
     #[test]
     fn insert_at_the_caret() {
-        let (mut t, mut d) = edit("ac", EditMode::SingleLine);
+        let mut t = edit("ac", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(1);
+        ctx(&mut t).set_caret(1);
-        ctx(&mut t, &mut d).insert("b");
+        ctx(&mut t).insert("b");
         assert_eq!(content(&t), "abc");
         assert_eq!(t.caret(), Some(2));
     }
 
     #[test]
     fn backspace_removes_the_character_before_the_caret() {
-        let (mut t, mut d) = edit("abc", EditMode::SingleLine);
+        let mut t = edit("abc", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(2);
+        ctx(&mut t).set_caret(2);
-        ctx(&mut t, &mut d).backspace(false);
+        ctx(&mut t).backspace(false);
         assert_eq!(content(&t), "ac");
     }
 
     #[test]
     fn backspace_at_the_start_does_nothing() {
-        let (mut t, mut d) = edit("abc", EditMode::SingleLine);
+        let mut t = edit("abc", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(0);
+        ctx(&mut t).set_caret(0);
-        ctx(&mut t, &mut d).backspace(false);
+        ctx(&mut t).backspace(false);
         assert_eq!(content(&t), "abc");
     }
 
     #[test]
     fn delete_removes_the_character_after_the_caret() {
-        let (mut t, mut d) = edit("abc", EditMode::SingleLine);
+        let mut t = edit("abc", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(1);
+        ctx(&mut t).set_caret(1);
-        ctx(&mut t, &mut d).delete(false);
+        ctx(&mut t).delete(false);
         assert_eq!(content(&t), "ac");
     }
 
     #[test]
     fn delete_at_the_end_does_nothing() {
-        let (mut t, mut d) = edit("abc", EditMode::SingleLine);
+        let mut t = edit("abc", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(3);
+        ctx(&mut t).set_caret(3);
-        ctx(&mut t, &mut d).delete(false);
+        ctx(&mut t).delete(false);
         assert_eq!(content(&t), "abc");
     }
 
     #[test]
     fn select_all_then_typing_replaces_everything() {
-        let (mut t, mut d) = edit("hello", EditMode::SingleLine);
+        let mut t = edit("hello", EditMode::SingleLine);
-        ctx(&mut t, &mut d).select_all();
+        ctx(&mut t).select_all();
         assert_eq!(t.selected_text().as_deref(), Some("hello"));
-        ctx(&mut t, &mut d).insert("x");
+        ctx(&mut t).insert("x");
         assert_eq!(content(&t), "x");
     }
 
     #[test]
     fn clearing_a_span_leaves_the_caret_at_its_start() {
-        let (mut t, mut d) = edit("abcdef", EditMode::SingleLine);
+        let mut t = edit("abcdef", EditMode::SingleLine);
-        ctx(&mut t, &mut d).select_all();
+        ctx(&mut t).select_all();
-        assert!(ctx(&mut t, &mut d).clear_span());
+        assert!(ctx(&mut t).clear_span());
         assert_eq!(content(&t), "");
         assert_eq!(t.caret(), Some(0));
     }
 
     #[test]
     fn tapping_an_empty_field_places_a_caret_so_typing_lands() {
-        let (mut t, mut d) = edit("", EditMode::MultiLine);
+        let mut t = edit("", EditMode::MultiLine);
-        ctx(&mut t, &mut d).select(vec2(40.0, 20.0), vec2(1080.0, 2400.0), false, false);
+        ctx(&mut t).select(vec2(40.0, 20.0), vec2(1080.0, 2400.0), false, false);
         assert!(t.caret().is_some(), "a tap must leave a caret behind");
-        ctx(&mut t, &mut d).insert("hi");
+        ctx(&mut t).insert("hi");
         assert_eq!(content(&t), "hi");
     }
 
     #[test]
     fn tapping_past_the_end_of_the_text_clamps_to_the_end() {
-        let (mut t, mut d) = edit("abc", EditMode::MultiLine);
+        let mut t = edit("abc", EditMode::MultiLine);
-        ctx(&mut t, &mut d).select(vec2(9000.0, 9000.0), vec2(1080.0, 2400.0), false, false);
+        ctx(&mut t).select(vec2(9000.0, 9000.0), vec2(1080.0, 2400.0), false, false);
         assert_eq!(t.caret(), Some(3));
     }
 
     #[test]
     fn dragging_without_a_previous_selection_selects_nothing() {
-        let (mut t, mut d) = edit("abc", EditMode::MultiLine);
+        let mut t = edit("abc", EditMode::MultiLine);
-        ctx(&mut t, &mut d).select(vec2(10.0, 10.0), vec2(1080.0, 2400.0), true, false);
+        ctx(&mut t).select(vec2(10.0, 10.0), vec2(1080.0, 2400.0), true, false);
         assert!(t.selection_range().is_none());
     }
 
     #[test]
     fn a_single_line_field_refuses_newlines() {
-        let (mut t, mut d) = edit("", EditMode::SingleLine);
+        let mut t = edit("", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(0);
+        ctx(&mut t).set_caret(0);
-        ctx(&mut t, &mut d).insert("a\nb");
+        ctx(&mut t).insert("a\nb");
         assert_eq!(content(&t), "ab");
-        ctx(&mut t, &mut d).newline();
+        ctx(&mut t).newline();
         assert_eq!(content(&t), "ab");
     }
 
     #[test]
     fn a_multi_line_field_keeps_newlines() {
-        let (mut t, mut d) = edit("", EditMode::MultiLine);
+        let mut t = edit("", EditMode::MultiLine);
-        ctx(&mut t, &mut d).set_caret(0);
+        ctx(&mut t).set_caret(0);
-        ctx(&mut t, &mut d).insert("a\nb");
+        ctx(&mut t).insert("a\nb");
         assert_eq!(content(&t), "a\nb");
     }
 
     #[test]
     fn take_empties_the_field_and_hands_back_what_was_there() {
-        let (mut t, mut d) = edit("some text", EditMode::SingleLine);
+        let mut t = edit("some text", EditMode::SingleLine);
-        assert_eq!(ctx(&mut t, &mut d).take(), "some text");
+        assert_eq!(ctx(&mut t).take(), "some text");
         assert_eq!(content(&t), "");
     }
 
     #[test]
     fn ime_preedit_replaces_its_own_previous_text() {
-        let (mut t, mut d) = edit("", EditMode::SingleLine);
+        let mut t = edit("", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(0);
+        ctx(&mut t).set_caret(0);
-        ctx(&mut t, &mut d).replace(0, "n");
+        ctx(&mut t).replace(0, "n");
         assert_eq!(content(&t), "n");
-        ctx(&mut t, &mut d).replace(1, "ni");
+        ctx(&mut t).replace(1, "ni");
         assert_eq!(content(&t), "ni");
-        ctx(&mut t, &mut d).replace(2, "に");
+        ctx(&mut t).replace(2, "に");
         assert_eq!(content(&t), "に");
     }
 
     #[test]
     fn composing_advances_the_caret_with_the_growing_text() {
-        let (mut t, mut d) = edit("", EditMode::SingleLine);
+        let mut t = edit("", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(0);
+        ctx(&mut t).set_caret(0);
-        ctx(&mut t, &mut d).replace(0, "h");
+        ctx(&mut t).replace(0, "h");
         assert_eq!(t.caret(), Some(1));
-        ctx(&mut t, &mut d).replace(1, "hi");
+        ctx(&mut t).replace(1, "hi");
         assert_eq!(content(&t), "hi");
         assert_eq!(t.caret(), Some(2));
-        ctx(&mut t, &mut d).replace(2, "hit");
+        ctx(&mut t).replace(2, "hit");
         assert_eq!(content(&t), "hit");
         assert_eq!(t.caret(), Some(3));
     }
 
     #[test]
     fn committing_composed_text_leaves_it_in_place_with_the_caret_after_it() {
-        let (mut t, mut d) = edit("say ", EditMode::SingleLine);
+        let mut t = edit("say ", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(4);
+        ctx(&mut t).set_caret(4);
-        ctx(&mut t, &mut d).replace(0, "hi");
+        ctx(&mut t).replace(0, "hi");
         assert_eq!(content(&t), "say hi");
-        ctx(&mut t, &mut d).replace(0, " ");
+        ctx(&mut t).replace(0, " ");
         assert_eq!(content(&t), "say hi ");
         assert_eq!(t.caret(), Some(7));
     }
 
     #[test]
     fn delete_byte_range_removes_exactly_that_range() {
-        let (mut t, mut d) = edit("hello world", EditMode::SingleLine);
+        let mut t = edit("hello world", EditMode::SingleLine);
-        ctx(&mut t, &mut d).delete_byte_range(5, 11);
+        ctx(&mut t).delete_byte_range(5, 11);
         assert_eq!(content(&t), "hello");
         assert_eq!(t.caret(), Some(5));
     }
 
     #[test]
     fn set_cursor_byte_collapses_to_a_caret_there() {
-        let (mut t, mut d) = edit("hello world", EditMode::SingleLine);
+        let mut t = edit("hello world", EditMode::SingleLine);
-        ctx(&mut t, &mut d).select_all();
+        ctx(&mut t).select_all();
-        ctx(&mut t, &mut d).set_cursor_byte(5);
+        ctx(&mut t).set_cursor_byte(5);
         assert_eq!(t.selected_text(), None);
         assert_eq!(t.caret(), Some(5));
     }
 
     #[test]
     fn motion_moves_the_caret_and_shift_extends_a_span() {
-        let (mut t, mut d) = edit("abc", EditMode::SingleLine);
+        let mut t = edit("abc", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(0);
+        ctx(&mut t).set_caret(0);
-        ctx(&mut t, &mut d).motion(Motion::Right, false);
+        ctx(&mut t).motion(Motion::Right, false);
         assert_eq!(t.caret(), Some(1));
-        ctx(&mut t, &mut d).motion(Motion::Right, true);
+        ctx(&mut t).motion(Motion::Right, true);
         assert_eq!(t.selected_text().as_deref(), Some("b"));
     }
 
     #[test]
     fn an_unshifted_arrow_collapses_a_span_to_its_edge() {
-        let (mut t, mut d) = edit("abcdef", EditMode::SingleLine);
+        let mut t = edit("abcdef", EditMode::SingleLine);
-        ctx(&mut t, &mut d).select_all();
+        ctx(&mut t).select_all();
-        ctx(&mut t, &mut d).motion(Motion::Left, false);
+        ctx(&mut t).motion(Motion::Left, false);
         assert_eq!(t.caret(), Some(0));
 
-        ctx(&mut t, &mut d).select_all();
+        ctx(&mut t).select_all();
-        ctx(&mut t, &mut d).motion(Motion::Right, false);
+        ctx(&mut t).motion(Motion::Right, false);
         assert_eq!(t.caret(), Some(6));
     }
 
     #[test]
     fn multibyte_text_is_edited_by_byte_offset() {
-        let (mut t, mut d) = edit("aé", EditMode::SingleLine);
+        let mut t = edit("aé", EditMode::SingleLine);
-        ctx(&mut t, &mut d).set_caret(3);
+        ctx(&mut t).set_caret(3);
-        ctx(&mut t, &mut d).backspace(false);
+        ctx(&mut t).backspace(false);
         assert_eq!(content(&t), "a");
     }
 }

iris/src/widget/text/mod.rs

@@ -4,87 +4,65 @@ mod selection;
 
 pub use build::*;
 pub use edit::*;
-use iris_core::util::MutDetect;
 pub use selection::*;
 
 use crate::prelude::*;
-use std::ops::{Deref, DerefMut};
 
 pub struct Text {
-    pub content: MutDetect<String>,
     view: TextView,
 }
 
 pub struct TextView {
-    pub attrs: MutDetect<TextAttrs>,
+    text: TextHandle,
-    pub buf: MutDetect<TextBuffer>,
-    tex: Option<RenderedText>,
-    width: Option<f32>,
     pub hint: Option<StrongWidget>,
     selection: TextSelection,
 }
 
 impl TextView {
     fn is_blank(&self) -> bool {
-        self.buf.is_empty()
+        self.text.text().is_empty()
     }
 
     pub fn wrap_width(&self) -> Option<f32> {
-        self.width
+        self.text.width()
     }
 
-    pub fn new(buf: TextBuffer, attrs: TextAttrs, hint: Option<StrongWidget>) -> Self {
+    pub fn new(text: TextHandle, hint: Option<StrongWidget>) -> Self {
         Self {
-            attrs: attrs.into(),
+            text,
-            buf: buf.into(),
-            tex: None,
-            width: None,
             hint,
             selection: TextSelection::default(),
         }
     }
 
     pub fn region(&self) -> UiRegion {
-        self.tex()
+        let align = self.text.attrs().align;
+        self.text
+            .rendered()
             .map(|t| t.size)
             .unwrap_or(Vec2::ZERO)
-            .align(self.align)
+            .align(align)
     }
 
     fn render(&mut self, painter: &mut Painter) -> RenderedText {
-        let width = if self.attrs.wrap {
+        let width = if self.text.attrs().wrap {
             Some(painter.px_size().x)
         } else {
             None
         };
-        let generation = painter.atlas_generation();
+        let tex = painter.render_text(&self.text, width);
-        if width == self.width
-            && let Some(tex) = &self.tex
-            && tex.generation == generation
-            && !self.attrs.changed
-            && !self.buf.changed
-        {
-            return tex.clone();
-        }
-        self.width = width;
-        let tex = painter.render_text(&mut self.buf, &self.attrs, width);
         if crate::diagnostics::trace_enabled() {
             log::debug!(
                 target: "iris::frame",
                 "iris text render: chars={} width={width:?} glyphs={} size={:?}",
-                self.buf.text().chars().count(),
+                self.text.text().chars().count(),
                 tex.glyphs.len(),
                 tex.size,
             );
         }
-        self.tex = Some(tex.clone());
-        self.attrs.changed = false;
-        self.buf.changed = false;
         tex
     }
-    pub fn tex(&self) -> Option<&RenderedText> {
+
-        self.tex.as_ref()
-    }
     pub fn draw(&mut self, painter: &mut Painter) -> Size {
         let tex = self.render(painter);
         if self.is_blank()
@@ -92,7 +70,7 @@ impl TextView {
         {
             return painter.widget(hint).size();
         }
-        let region = tex.size.align(self.align);
+        let region = tex.size.align(self.text.attrs().align);
         let within = region.within(&painter.region());
         painter.glyphs(&tex, within);
         Size::abs(tex.size)
@@ -108,8 +86,10 @@ impl TextView {
         let Some(selection) = self.selection.range else {
             return used;
         };
-        let layout = self.buf.layout();
+        let geometry = self
-        for (rect, _) in selection.geometry(layout) {
+            .text
+            .with_layout(|layout, _| selection.geometry(layout));
+        for (rect, _) in geometry {
             let size = vec2(rect.width() as f32, rect.height() as f32);
             let top_left = vec2(rect.x0 as f32, rect.y0 as f32);
             let paint = painter.paint(&PaintId::SKY);
@@ -119,7 +99,9 @@ impl TextView {
             );
         }
         if caret {
-            let caret = selection.focus().geometry(layout, CARET_WIDTH);
+            let caret = self
+                .text
+                .with_layout(|layout, _| selection.focus().geometry(layout, CARET_WIDTH));
             let size = vec2(caret.width() as f32, caret.height() as f32);
             let top_left = vec2(caret.x0 as f32, caret.y0 as f32);
             let paint = painter.paint(&PaintId::WHITE);
@@ -132,28 +114,23 @@ impl TextView {
     }
 
     pub fn content(&self) -> String {
-        self.buf.text().to_string()
+        self.text.text().to_string()
+    }
+
+    pub fn update_attrs<R>(&mut self, update: impl FnOnce(&mut TextAttrs) -> R) -> R {
+        self.text.update_attrs(update)
     }
 }
 
 impl Text {
-    pub fn new(content: impl Into<String>) -> Self {
+    pub fn set_text(&mut self, content: impl Into<String>) {
-        let content: String = content.into();
+        if self.view.text.set_text(content) {
-        Self {
-            view: TextView::new(TextBuffer::new(&content), TextAttrs::default(), None),
-            content: content.into(),
-        }
-    }
-    fn update_buf(&mut self) {
-        if self.content.changed {
-            self.content.changed = false;
-            self.view.buf.set_text(self.content.as_str());
             self.view.selection.deselect();
         }
     }
 
     pub fn selected_text(&self) -> Option<String> {
-        self.view.selection.selected_text(self.view.buf.text())
+        self.view.selection.selected_text(&self.view.text.text())
     }
 
     pub fn selection_range(&self) -> Option<std::ops::Range<usize>> {
@@ -161,18 +138,22 @@ impl Text {
     }
 
     pub fn set_with_spans(&mut self, content: impl Into<String>, spans: Vec<SpanStyle>) {
-        let content = content.into();
+        self.view.text.set_text(content);
-        *self.content = content.clone();
+        self.view.text.set_spans(spans);
-        self.content.changed = false;
-        self.view.buf.set_text(content);
-        self.view.buf.set_spans(spans);
         self.view.selection.deselect();
     }
+
+    pub fn content(&self) -> String {
+        self.view.content()
+    }
+
+    pub fn update_attrs<R>(&mut self, update: impl FnOnce(&mut TextAttrs) -> R) -> R {
+        self.view.update_attrs(update)
+    }
 }
 
 impl Widget for Text {
     fn draw(&mut self, painter: &mut Painter) {
-        self.update_buf();
         let size = if self.view.selection.range.is_some() {
             self.view.draw_selectable(painter, false)
         } else {
@@ -188,34 +169,6 @@ impl Widget for Text {
 
 pub(super) const CARET_WIDTH: f32 = 1.0;
 
-impl Deref for Text {
-    type Target = TextAttrs;
-
-    fn deref(&self) -> &Self::Target {
-        &self.view
-    }
-}
-
-impl DerefMut for Text {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.view
-    }
-}
-
-impl Deref for TextView {
-    type Target = TextAttrs;
-
-    fn deref(&self) -> &Self::Target {
-        &self.attrs
-    }
-}
-
-impl DerefMut for TextView {
-    fn deref_mut(&mut self) -> &mut Self::Target {
-        &mut self.attrs
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use crate::layout_tests::TestRsc;
@@ -237,20 +190,20 @@ mod tests {
         let (mut rsc, _render, text, _root) = rendered_text("hello there");
         text.selection(&mut rsc).select_all();
 
-        let view = TextView::new(TextBuffer::new("hello there"), TextAttrs::default(), None);
+        let edit = wtext("hello there")
-        let mut edit = TextEdit::new(view, EditMode::MultiLine);
+            .editable(EditMode::MultiLine)
-        let mut data = TextData::default();
+            .add_strong(&mut rsc);
-        TextEditCtx {
+        let edit_id = edit.weak();
-            text: &mut edit,
+        edit_id(&mut rsc).select_all();
-            data: &mut data,
-        }
-        .select_all();
 
         assert_eq!(
             rsc.ui.widgets[text].selection_range(),
-            edit.selection_range()
+            rsc.ui.widgets[edit_id].selection_range()
+        );
+        assert_eq!(
+            rsc.ui.widgets[text].selected_text(),
+            rsc.ui.widgets[edit_id].selected_text()
         );
-        assert_eq!(rsc.ui.widgets[text].selected_text(), edit.selected_text());
     }
 
     #[test]
@@ -262,7 +215,7 @@ mod tests {
             Some("before")
         );
 
-        *rsc.ui.widgets[text].content = "after".to_string();
+        rsc.ui.widgets[text].set_text("after");
         render.update(&root, &mut rsc);
 
         assert_eq!(rsc.ui.widgets[text].selected_text(), None);
@@ -277,17 +230,15 @@ mod tests {
         render.update(&root, &mut rsc);
         let selected = render.active[&text.id()].primitives.len();
 
-        let view = TextView::new(TextBuffer::new("selected"), TextAttrs::default(), None);
+        let edit = wtext("selected")
-        let edit = rsc
+            .editable(EditMode::MultiLine)
-            .ui
+            .add_strong(&mut rsc);
-            .widgets
-            .add_strong(TextEdit::new(view, EditMode::MultiLine));
         let edit_id = edit.weak();
         let edit_root = edit.any();
         let mut edit_render = UiRenderState::new();
         edit_render.resize((800.0, 600.0));
         edit_render.update(&edit_root, &mut rsc);
-        edit_id.edit(&mut rsc).select_all();
+        edit_id(&mut rsc).select_all();
         edit_render.update(&edit_root, &mut rsc);
         let editable = edit_render.active[&edit_id.id()].primitives.len();
 
@@ -314,16 +265,16 @@ mod tests {
         render.resize((800.0, 600.0));
         render.update(&root, &mut rsc);
 
-        let rasterised = rsc.ui.text.atlas.glyph_count();
+        let rasterised = rsc.ui.text.borrow().atlas.glyph_count();
         assert!(rasterised > 0, "the first frame rasterised no glyphs");
 
-        rsc.ui.text.atlas.clear();
+        rsc.ui.text.borrow_mut().atlas.clear();
-        assert_eq!(rsc.ui.text.atlas.glyph_count(), 0);
+        assert_eq!(rsc.ui.text.borrow().atlas.glyph_count(), 0);
         render.resize((800.0, 600.0));
         render.update(&root, &mut rsc);
 
         assert_eq!(
-            rsc.ui.text.atlas.glyph_count(),
+            rsc.ui.text.borrow().atlas.glyph_count(),
             rasterised,
             "the second frame re-emitted its cached glyphs instead of \
              re-rendering them against the fresh atlas"

iris/src/widget/text/selection.rs

@@ -1,6 +1,5 @@
 use crate::prelude::*;
-use iris_core::{PaintId, TextData};
+use parley::{Affinity, Selection as ParleySelection};
-use parley::{Affinity, Layout, Selection as ParleySelection};
 use std::time::Instant;
 
 /// The selection state shared by display text and editable text. Editing,
@@ -35,23 +34,21 @@ impl TextSelection {
     }
 }
 
-/// Selection operations that need both a text widget's shaped buffer and
+/// Selection operations shared by ordinary and editable text, using the
-/// iris's text resources. `TextEditCtx` delegates to this same context rather
+/// widget's arena-backed layout rather than maintaining an editable-only copy
-/// than maintaining an editable-only copy of the geometry and hit testing.
+/// of the geometry and hit testing.
 pub struct TextSelectionCtx<'a> {
     pub(super) view: &'a mut TextView,
-    pub(super) data: &'a mut TextData,
 }
 
 impl TextSelectionCtx<'_> {
-    pub(super) fn layout(&mut self) -> &Layout<PaintId> {
-        selection_layout(self.view, self.data)
-    }
-
     pub(crate) fn refresh(&mut self) {
         if let Some(selection) = self.view.selection.range {
-            let layout = self.layout();
+            self.view.selection.range = Some(
-            self.view.selection.range = Some(selection.refresh(layout));
+                self.view
+                    .text
+                    .with_layout(|layout, _| selection.refresh(layout)),
+            );
         }
     }
 
@@ -59,21 +56,23 @@ impl TextSelectionCtx<'_> {
     /// the same widget-local coordinates as a `CursorSense` event.
     pub fn byte_at(&mut self, pos: Vec2, size: Vec2) -> usize {
         let pos = pos - self.view.region().top_left().to_abs(size);
-        let layout = self.layout();
+        self.view.text.with_layout(|layout, _| {
-        ParleySelection::from_point(layout, pos.x, pos.y)
+            ParleySelection::from_point(layout, pos.x, pos.y)
-            .focus()
+                .focus()
-            .index()
+                .index()
+        })
     }
 
     pub fn select_all(&mut self) {
-        let len = self.view.buf.text().len();
+        let len = self.view.text.text().len();
         if len == 0 {
             return;
         }
-        let layout = self.layout();
+        self.view.selection.range = Some(self.view.text.with_layout(|layout, _| {
-        let anchor = parley::Cursor::from_byte_index(layout, 0, Affinity::default());
+            let anchor = parley::Cursor::from_byte_index(layout, 0, Affinity::default());
-        let focus = parley::Cursor::from_byte_index(layout, len, Affinity::default());
+            let focus = parley::Cursor::from_byte_index(layout, len, Affinity::default());
-        self.view.selection.range = Some(ParleySelection::new(anchor, focus));
+            ParleySelection::new(anchor, focus)
+        }));
     }
 
     pub fn select(&mut self, pos: Vec2, size: Vec2, drag: bool, recent: bool) {
@@ -81,8 +80,7 @@ impl TextSelectionCtx<'_> {
         let previous = self.view.selection.range;
         let previous_hit = self.view.selection.double_hit;
 
-        let outcome = {
+        let outcome = self.view.text.with_layout(|layout, _| {
-            let layout = self.layout();
             if drag {
                 previous.map(|selection| {
                     (
@@ -109,7 +107,7 @@ impl TextSelectionCtx<'_> {
                     (Some(hit), None)
                 })
             }
-        };
+        });
 
         if let Some((range, double_hit)) = outcome {
             self.view.selection.range = range;
@@ -122,39 +120,28 @@ impl TextSelectionCtx<'_> {
     }
 
     pub(crate) fn set_caret(&mut self, index: usize) {
-        let index = index.min(self.view.buf.text().len());
+        let index = index.min(self.view.text.text().len());
-        let layout = self.layout();
+        self.view.selection.range = Some(self.view.text.with_layout(|layout, _| {
-        self.view.selection.range = Some(ParleySelection::from_byte_index(
+            ParleySelection::from_byte_index(layout, index, Affinity::default())
-            layout,
+        }));
-            index,
-            Affinity::default(),
-        ));
     }
 
     fn select_between(&mut self, anchor: usize, focus: usize) {
-        let len = self.view.buf.text().len();
+        let len = self.view.text.text().len();
-        let layout = self.layout();
+        self.view.selection.range = Some(self.view.text.with_layout(|layout, _| {
-        let anchor = parley::Cursor::from_byte_index(layout, anchor.min(len), Affinity::default());
+            let anchor =
-        let focus = parley::Cursor::from_byte_index(layout, focus.min(len), Affinity::default());
+                parley::Cursor::from_byte_index(layout, anchor.min(len), Affinity::default());
-        self.view.selection.range = Some(ParleySelection::new(anchor, focus));
+            let focus =
+                parley::Cursor::from_byte_index(layout, focus.min(len), Affinity::default());
+            ParleySelection::new(anchor, focus)
+        }));
     }
 }
 
-pub(super) fn selection_layout<'a>(
-    view: &'a mut TextView,
-    data: &mut TextData,
-) -> &'a Layout<PaintId> {
-    let attrs = view.attrs.clone();
-    let width = view.wrap_width();
-    let density = data.density;
-    view.buf.shape(data, &attrs, width, density);
-    view.buf.layout()
-}
-
 /// Gives an ordinary `Text` handle access to the same selection operations as
-/// `TextEditCtx`. Gesture policy is intentionally not part of this trait; a
+/// `TextEdit`. Gesture policy is intentionally not part of this trait; a
-/// selection controller and an editor's focus handler do different
+/// selection controller and an editor's focus handler do different things
-/// things with the same mechanics.
+/// with the same mechanics.
 pub trait TextSelectable {
     fn selection<'a>(&self, ui: &'a mut impl UiRsc) -> TextSelectionCtx<'a>;
 }
@@ -164,7 +151,6 @@ impl<I: IdLike<Widget = Text>> TextSelectable for I {
         let ui: &mut UiData = ui.ui_mut();
         TextSelectionCtx {
             view: &mut ui.widgets.get_mut(self).unwrap().view,
-            data: &mut ui.text,
         }
     }
 }
@@ -256,10 +242,8 @@ impl SelectionController {
             .get_dyn_mut(id)?
             .as_any_mut()
             .downcast_mut::<Text>()?;
-        text.update_buf();
         let mut ctx = TextSelectionCtx {
             view: &mut text.view,
-            data: &mut ui.text,
         };
         Some(f(&mut ctx))
     }
@@ -334,7 +318,7 @@ impl SelectionController {
         for &text_id in &self.order[lo..=hi] {
             let forward = anchor_at <= focus_at;
             Self::with_text(rsc, text_id, |text| {
-                let len = text.view.buf.text().len();
+                let len = text.view.text.text().len();
                 let (start, end) = if text_id == anchor && text_id == id {
                     (anchor_byte, focus_byte)
                 } else if text_id == anchor {