Cranpose UI Layout

The layout protocol and constraints system for Cranpose.

When to Use

This crate defines the contract between parent and child layouts. You will use this crate when implementing custom Layout logic or creating new layout modifiers. It provides the types necessary to measure content and place it within the available space.

Key Concepts

• Constraints: Immutable constraints passed from parent to child, defining the minimum and maximum width and height a child is allowed to be.
• Measurable: A trait for any node that can be measured.
• Placeable: The result of a measurement pass. It holds the measured size and provides a method to position the content relative to its parent.

Example: Fixed Size Measurement

impl Measurable for MyNode {
    fn measure(&self, constraints: Constraints) -> Placeable {
        // Coerce the requested size to be within the constraints
        let width = constraints.constrain_width(100);
        let height = constraints.constrain_height(100);
        
        layout(width, height, |_| {})
    }
}