How do I check if a click happened on a specific widget?

Use the event.hits(cx, area) method within the handle_event function to match the event against the widget's bounding area, returning Hit variants like FingerDown or FingerUp.

How does event propagation work in Makepad?

Events arrive from the platform, enter the root widget, and are propagated down the component tree via handle_event calls. Parent widgets then capture actions from their children to respond to user intent.

What is the difference between an Event and an Action in Makepad?

Events typically flow down from the platform layer to the widgets (e.g., a mouse click), while Actions flow up from child widgets to parents (e.g., a 'Submitted' signal) to communicate state changes.

Is it possible to trigger UI updates from a background thread?

Yes, this skill provides patterns for using Cx::post_action(), which is a thread-safe method allowing background tasks or timers to send signals back to the main UI thread.

Makepad Event & Action Handling

Name: Makepad Event & Action Handling
Author: ZhangHanDong

byZhangHanDong

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699

Design Tools

Streamlines the implementation of interaction logic and event propagation within the Makepad UI framework.

About

The Makepad Event & Action skill equips Claude with deep expertise in managing the complex interaction lifecycle of Makepad applications. It facilitates the implementation of standard events like mouse, keyboard, and touch inputs, while providing patterns for custom widget actions that allow child components to communicate effectively with their parents. By mastering event propagation and the use of the Hit enum, this skill ensures that UI components are responsive, thread-safe, and follow Makepad's idiomatic patterns for cross-platform development.

Key Features

Implementation of comprehensive event variants including Mouse, Keyboard, and Lifecycle
Expertise in event propagation and action capturing using cx.capture_actions()
699 GitHub stars
Precision input handling using the Hit enum for specialized widget interactions
Creation and handling of custom Widget Actions for modular component communication
Thread-safe asynchronous updates via Cx::post_action() patterns

Use Cases

Synchronizing background thread results with the UI via post-action triggers
Managing data flow between nested widgets using the Action trait system
Developing interactive custom UI components with complex gesture or keyboard support

About

Key Features

Implementation of comprehensive event variants including Mouse, Keyboard, and Lifecycle
Expertise in event propagation and action capturing using cx.capture_actions()
699 GitHub stars
Precision input handling using the Hit enum for specialized widget interactions
Creation and handling of custom Widget Actions for modular component communication
Thread-safe asynchronous updates via Cx::post_action() patterns

Use Cases

Synchronizing background thread results with the UI via post-action triggers
Managing data flow between nested widgets using the Action trait system
Developing interactive custom UI components with complex gesture or keyboard support