Popup (Clear) Widget Example

Demonstrates how to render opaque overlays on top of content.

Terminal renders are additive. If you draw a new widget over an old one, the background colors might mix if not handled correctly. The Clear widget resets the area to default (usually transparent/black) to ensure a clean canvas for popups.

Features Demonstrated

• The Clear Widget: Printing spaces over an area to “erase” what was underneath.

• Centering: Using Layout constraints to perfectly center a block on screen.

• Style Bleed: showing what happens when you don’t use Clear (background colors leak through).

Hotkeys

• Space: Toggle Clear Widget (Observe the red background effect when disabled)

• q: Quit

Usage

ruby examples/widget_popup_demo/app.rb

Learning Outcomes

Use this example if you need to… - Create a modal dialog (Confirm, Alert, Form). - Implement a dropdown menu that overlays other content. - Fix visual artifacts where old text shows through new widgets.