example: Add input example. (#1380)

Cargo.lock

@@ -3564,6 +3564,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "input"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "gpui",
+ "gpui-component",
+]
+
 [[package]]
 name = "instant"
 version = "0.1.13"

Cargo.toml

@@ -1,5 +1,5 @@
 [workspace]
-members = ["examples/hello_world", "examples/window_title", "crates/macros", "crates/story", "crates/ui", "examples/window_title", "examples/app_assets", "examples/app_assets"]
+members = ["examples/hello_world", "examples/window_title", "crates/macros", "crates/story", "crates/ui", "examples/window_title", "examples/app_assets", "examples/app_assets", "examples/input"]
 
 default-members = ["crates/story"]
 resolver = "2"

examples/hello_world/src/main.rs

@@ -1,12 +1,8 @@
 use gpui::*;
-use gpui_component::{
-    button::{Button, ButtonVariants},
-    Root, StyledExt,
-};
+use gpui_component::{button::*, *};
 
-pub struct HelloWorld;
-
-impl Render for HelloWorld {
+pub struct Example;
+impl Render for Example {
     fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
         div()
             .v_flex()
@@ -14,7 +10,6 @@ impl Render for HelloWorld {
             .size_full()
             .items_center()
             .justify_center()
-            .text_center()
             .child("Hello, World!")
             .child(
                 Button::new("ok")
@@ -29,38 +24,13 @@ fn main() {
     let app = Application::new();
 
     app.run(move |cx| {
-        // We must initialize gpui_component before using it.
+        // This must be called before using any GPUI Component features.
         gpui_component::init(cx);
 
-        cx.activate(true);
-
-        let mut window_size = size(px(640.), px(480.));
-        if let Some(display) = cx.primary_display() {
-            let display_size = display.bounds().size;
-            window_size.width = window_size.width.min(display_size.width * 0.85);
-            window_size.height = window_size.height.min(display_size.height * 0.85);
-        }
-        let window_bounds = Bounds::centered(None, window_size, cx);
-
         cx.spawn(async move |cx| {
-            let options = WindowOptions {
-                window_bounds: Some(WindowBounds::Windowed(window_bounds)),
-                titlebar: None,
-                window_min_size: Some(gpui::Size {
-                    width: px(640.),
-                    height: px(480.),
-                }),
-                kind: WindowKind::Normal,
-                #[cfg(target_os = "linux")]
-                window_background: gpui::WindowBackgroundAppearance::Transparent,
-                #[cfg(target_os = "linux")]
-                window_decorations: Some(gpui::WindowDecorations::Client),
-                ..Default::default()
-            };
-
-            cx.open_window(options, |window, cx| {
-                let view = cx.new(|_| HelloWorld);
-                // The first level on the window must be Root.
+            cx.open_window(WindowOptions::default(), |window, cx| {
+                let view = cx.new(|_| Example);
+                // This first level on the window, should be a Root.
                 cx.new(|cx| Root::new(view.into(), window, cx))
             })?;
 

examples/input/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "input"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+anyhow.workspace = true
+gpui.workspace = true
+gpui-component = { workspace = true }
+
+[lints]
+workspace = true

examples/input/src/main.rs

@@ -0,0 +1,78 @@
+use gpui::*;
+use gpui_component::{
+    input::{InputEvent, InputState, TextInput},
+    *,
+};
+
+pub struct Example {
+    input_state: Entity<InputState>,
+    display_text: SharedString,
+
+    /// We need to keep the subscriptions alive with the Example entity.
+    ///
+    /// So if the Example entity is dropped, the subscriptions are also dropped.
+    /// This is important to avoid memory leaks.
+    _subscriptions: Vec<Subscription>,
+}
+
+impl Example {
+    fn new(window: &mut Window, cx: &mut Context<Self>) -> Self {
+        let input_state = cx.new(|cx| InputState::new(window, cx).placeholder("Enter your name"));
+
+        let _subscriptions = vec![cx.subscribe_in(&input_state, window, {
+            let input_state = input_state.clone();
+            move |this, _, ev: &InputEvent, _window, cx| match ev {
+                InputEvent::Change => {
+                    let value = input_state.read(cx).value();
+                    this.display_text = format!("Hello, {}!", value).into();
+                    cx.notify()
+                }
+                _ => {}
+            }
+        })];
+
+        Self {
+            input_state,
+            display_text: SharedString::default(),
+            _subscriptions,
+        }
+    }
+}
+
+impl Render for Example {
+    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {
+        v_flex()
+            .p_5()
+            .gap_2()
+            .size_full()
+            .items_center()
+            .justify_center()
+            .child(TextInput::new(&self.input_state))
+            .child(self.display_text.clone())
+    }
+}
+
+fn main() {
+    let app = Application::new();
+
+    app.run(move |cx| {
+        // This must be called before using any GPUI Component features.
+        gpui_component::init(cx);
+
+        let window_options = WindowOptions {
+            window_bounds: Some(WindowBounds::centered(size(px(800.), px(600.)), cx)),
+            ..Default::default()
+        };
+
+        cx.spawn(async move |cx| {
+            cx.open_window(window_options, |window, cx| {
+                let view = cx.new(|cx| Example::new(window, cx));
+                // This first level on the window, should be a Root.
+                cx.new(|cx| Root::new(view.into(), window, cx))
+            })?;
+
+            Ok::<_, anyhow::Error>(())
+        })
+        .detach();
+    });
+}