Merge pull request #1938 from iced-rs/text-cache-modes

Text cache modes

2 files changed, 21 insertions, 1 deletions

diff --git a/graphics/src/backend.rs b/graphics/src/backend.rs
index 77bb650b..59e95bf8 100644
--- a/graphics/src/backend.rs
+++ b/graphics/src/backend.rs
@@ -12,6 +12,13 @@ use std::borrow::Cow;
 pub trait Backend {
     /// The custom kind of primitives this [`Backend`] supports.
     type Primitive;
+
+    /// Trims the measurements cache.
+    ///
+    /// This method is currently necessary to properly trim the text cache in
+    /// `iced_wgpu` and `iced_glow` because of limitations in the text rendering
+    /// pipeline. It will be removed in the future.
+    fn trim_measurements(&mut self) {}
 }
 
 /// A graphics backend that supports text rendering.
diff --git a/graphics/src/renderer.rs b/graphics/src/renderer.rs
index d80dea34..c0cec60a 100644
--- a/graphics/src/renderer.rs
+++ b/graphics/src/renderer.rs
@@ -3,10 +3,13 @@ use crate::backend::{self, Backend};
 use crate::Primitive;
 
 use iced_core::image;
+use iced_core::layout;
 use iced_core::renderer;
 use iced_core::svg;
 use iced_core::text::{self, Text};
-use iced_core::{Background, Color, Font, Point, Rectangle, Size, Vector};
+use iced_core::{
+    Background, Color, Element, Font, Point, Rectangle, Size, Vector,
+};
 
 use std::borrow::Cow;
 use std::marker::PhantomData;
@@ -85,6 +88,16 @@ impl<B: Backend, T> Renderer<B, T> {
 impl<B: Backend, T> iced_core::Renderer for Renderer<B, T> {
     type Theme = T;
 
+    fn layout<Message>(
+        &mut self,
+        element: &Element<'_, Message, Self>,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        self.backend.trim_measurements();
+
+        element.as_widget().layout(self, limits)
+    }
+
     fn with_layer(&mut self, bounds: Rectangle, f: impl FnOnce(&mut Self)) {
         let current = self.start_layer();