Module validation_error 

Inline validation error display widget. Inline validation error display widget.

Displays validation errors near form fields with:

• Configurable error styling (default: red text with icon)
• Smooth appearance animation via opacity interpolation
• Screen reader accessibility (ARIA error association via semantic info)

Example

use ftui_widgets::{ValidationErrorDisplay, ValidationErrorState};

// Simple inline error
let error = ValidationErrorDisplay::new("This field is required");
let mut state = ValidationErrorState::default();
error.render(area, &mut frame, &mut state);

// With custom styling
let error = ValidationErrorDisplay::new("Invalid email address")
    .with_icon("!")
    .with_style(Style::new().fg(PackedRgba::rgb(255, 100, 100)));

Invariants (Alien Artifact)

1. Icon presence: Icon is always rendered when error is visible
2. Animation bounds: Opacity is clamped to [0.0, 1.0]
3. Width calculation: Total width = icon_width + 1 + message_width
4. Accessibility: When rendered, screen readers can announce error text

Failure Modes

Scenario	Behavior
Empty message	Renders icon only
Zero-width area	No-op, state unchanged
Very narrow area	Truncates message with ellipsis
Animation overflow	Saturates at 0.0 or 1.0

Structs

ValidationErrorDisplay

A widget for displaying inline validation errors.

ValidationErrorState

State for validation error animation and accessibility.

Constants

ANIMATION_DURATION_MS

Default animation duration.

ERROR_BG_DEFAULT

Default error background color (dark red).

ERROR_FG_DEFAULT

Default error foreground color (red).

ERROR_ICON_DEFAULT

Default error icon.