Merge pull request #2058 from iced-rs/explicit-text-caching

Explicit text caching

1 files changed, 17 insertions, 8 deletions

diff --git a/examples/todos/src/main.rs b/examples/todos/src/main.rs
index 62c17926..501bf67e 100644
--- a/examples/todos/src/main.rs
+++ b/examples/todos/src/main.rs
@@ -3,8 +3,8 @@ use iced::font::{self, Font};
 use iced::keyboard;
 use iced::theme::{self, Theme};
 use iced::widget::{
-    self, button, checkbox, column, container, row, scrollable, text,
-    text_input, Text,
+    self, button, checkbox, column, container, keyed_column, row, scrollable,
+    text, text_input, Text,
 };
 use iced::window;
 use iced::{Application, Element};
@@ -12,10 +12,14 @@ use iced::{Color, Command, Length, Settings, Subscription};
 
 use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
+use uuid::Uuid;
 
 static INPUT_ID: Lazy<text_input::Id> = Lazy::new(text_input::Id::unique);
 
 pub fn main() -> iced::Result {
+    #[cfg(not(target_arch = "wasm32"))]
+    tracing_subscriber::fmt::init();
+
     Todos::run(Settings {
         window: window::Settings {
             size: (500, 800),
@@ -220,17 +224,19 @@ impl Application for Todos {
                     tasks.iter().filter(|task| filter.matches(task));
 
                 let tasks: Element<_> = if filtered_tasks.count() > 0 {
-                    column(
+                    keyed_column(
                         tasks
                             .iter()
                             .enumerate()
                             .filter(|(_, task)| filter.matches(task))
                             .map(|(i, task)| {
-                                task.view(i).map(move |message| {
-                                    Message::TaskMessage(i, message)
-                                })
-                            })
-                            .collect(),
+                                (
+                                    task.id,
+                                    task.view(i).map(move |message| {
+                                        Message::TaskMessage(i, message)
+                                    }),
+                                )
+                            }),
                     )
                     .spacing(10)
                     .into()
@@ -279,6 +285,8 @@ impl Application for Todos {
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 struct Task {
+    #[serde(default = "Uuid::new_v4")]
+    id: Uuid,
     description: String,
     completed: bool,
 
@@ -314,6 +322,7 @@ impl Task {
 
     fn new(description: String) -> Self {
         Task {
+            id: Uuid::new_v4(),
             description,
             completed: false,
             state: TaskState::Idle,