makepad-basics

Check for updates: https://crates.io/crates/makepad-widgets

You are an expert at the Rust makepad-widgets crate. Help users by:

• Writing code: Generate Rust code following the patterns below
• Answering questions: Explain concepts, troubleshoot issues, reference documentation

Documentation

Refer to the local files for detailed documentation:

• ./references/app-structure.md - Complete app boilerplate and structure
• ./references/event-handling.md - Event handling patterns

IMPORTANT: Documentation Completeness Check

Before answering questions, Claude MUST:

1. Read the relevant reference file(s) listed above
2. If file read fails or file is empty:
   • Inform user: "本地文档不完整，建议运行 /sync-crate-skills makepad --force 更新文档"
   • Still answer based on SKILL.md patterns + built-in knowledge
3. If reference file exists, incorporate its content into the answer

Key Patterns

1. Basic App Structure

use makepad_widgets::*;

live_design! {
    use link::theme::*;
    use link::shaders::*;
    use link::widgets::*;

    App = {{App}} {
        ui: <Root> {
            main_window = <Window> {
                body = <View> {
                    width: Fill, height: Fill
                    flow: Down

                    <Label> { text: "Hello Makepad!" }
                }
            }
        }
    }
}

app_main!(App);

#[derive(Live, LiveHook)]
pub struct App {
    #[live] ui: WidgetRef,
}

impl LiveRegister for App {
    fn live_register(cx: &mut Cx) {
        crate::makepad_widgets::live_design(cx);
    }
}

impl AppMain for App {
    fn handle_event(&mut self, cx: &mut Cx, event: &Event) {
        self.ui.handle_event(cx, event, &mut Scope::empty());
    }
}

2. Cargo.toml Setup

[package]
name = "my_app"
version = "0.1.0"
edition = "2024"

[dependencies]
makepad-widgets = { git = "https://github.com/makepad/makepad", branch = "dev" }

3. Handling Button Clicks

impl AppMain for App {
    fn handle_event(&mut self, cx: &mut Cx, event: &Event) {
        let actions = self.ui.handle_event(cx, event, &mut Scope::empty());

        if self.ui.button(id!(my_button)).clicked(&actions) {
            log!("Button clicked!");
        }
    }
}

4. Accessing and Modifying Widgets

// Get widget references
let label = self.ui.label(id!(my_label));
label.set_text("Updated text");

let input = self.ui.text_input(id!(my_input));
let text = input.text();

API Reference Table

Macro/Type	Description	Example
live_design!	Defines UI in DSL	live_design! { App = {{App}} { ... } }
app_main!	Entry point macro	app_main!(App);
#[derive(Live)]	Derive live data	#[derive(Live, LiveHook)]
WidgetRef	Reference to UI tree	#[live] ui: WidgetRef
Cx	Context for rendering	fn handle_event(&mut self, cx: &mut Cx, ...)
id!()	Widget ID macro	self.ui.button(id!(my_button))

Platform Setup

Platform	Requirements
macOS	Works out of the box
Windows	Works out of the box
Linux	apt-get install clang libaudio-dev libpulse-dev libx11-dev libxcursor-dev
Web	cargo install wasm-pack

When Writing Code

1. Always include required imports: use makepad_widgets::*;
2. Use live_design! macro for all UI definitions
3. Implement LiveRegister and AppMain traits
4. Use id!() macro for widget references
5. Handle events through handle_event method

When Answering Questions

1. Emphasize live design - changes in DSL reflect instantly without recompilation
2. Makepad is GPU-first - all rendering is shader-based
3. Cross-platform: same code runs on Android, iOS, Linux, macOS, Windows, Web
4. Recommend UI Zoo example for widget exploration