co-mono/packages/tui/test/multi-layout.ts
Mario Zechner 192d8d2600 fix(tui): Container change detection for proper differential rendering
Fixed rendering artifact where duplicate bottom borders appeared when components
dynamically shifted positions (e.g., Ctrl+C in agent clearing status container).

Root cause: Container wasn't reporting as "changed" when cleared (0 children),
causing differential renderer to skip re-rendering that area.

Solution: Container now tracks previousChildCount and reports changed when
child count changes, ensuring proper re-rendering when containers are cleared.

- Added comprehensive test reproducing the layout shift artifact
- Fixed Container to track and report child count changes
- All tests pass including new layout shift artifact test
2025-08-11 02:31:49 +02:00

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TypeScript

#!/usr/bin/env npx tsx
import { TUI, Container, TextComponent, TextEditor, MarkdownComponent } from "../src/index.js";
/**
* Multi-Component Layout Demo
*
* Demonstrates:
* - Complex layout with multiple containers
* - Header, sidebar, main content, and footer areas
* - Mixing static and dynamic components
* - Debug logging configuration
*/
const ui = new TUI();
// Create layout containers
const header = new TextComponent("📝 Advanced TUI Demo", { bottom: 1 });
const mainContent = new Container();
const sidebar = new Container();
const footer = new TextComponent("Press Ctrl+C to exit", { top: 1 });
// Sidebar content
sidebar.addChild(new TextComponent("📁 Files:", { bottom: 1 }));
sidebar.addChild(new TextComponent("- config.json"));
sidebar.addChild(new TextComponent("- README.md"));
sidebar.addChild(new TextComponent("- package.json"));
// Main content area
const chatArea = new Container();
const inputArea = new TextEditor();
// Add welcome message
chatArea.addChild(
new MarkdownComponent(`
# Welcome to the TUI Demo
This demonstrates multiple components working together:
- **Header**: Static title with padding
- **Sidebar**: File list (simulated)
- **Chat Area**: Scrollable message history
- **Input**: Interactive text editor
- **Footer**: Status information
Try typing a message and pressing Enter!
`),
);
inputArea.onSubmit = (text) => {
if (text.trim()) {
const message = new MarkdownComponent(`
**${new Date().toLocaleTimeString()}:** ${text}
`);
chatArea.addChild(message);
ui.requestRender();
}
};
// Build layout
mainContent.addChild(chatArea);
mainContent.addChild(inputArea);
ui.addChild(header);
ui.addChild(mainContent);
ui.addChild(footer);
ui.setFocus(inputArea);
// Handle Ctrl+C to exit
ui.onGlobalKeyPress = (data: string) => {
if (data === "\x03") {
ui.stop();
console.log("\nMulti-layout demo exited");
process.exit(0);
}
return true;
};
ui.start();