class Opal::UI::LayerStack

• Opal::UI::LayerStack
• Reference
• Object

Overview

Manages a depth-ordered stack of Layer surfaces. Composites layers in sorted z-index order onto a target buffer, ensuring overlays, floating windows, dropdowns, and notifications render with correct depth, transparency, and clipping.

Defined in:

opal/ui/layer_stack.cr

Constant Summary

TIER_BACKGROUND = 0

Standard semantic z-index tier constants

TIER_CONTENT = 100

TIER_CURSOR = 1000

TIER_MODALS = 800

TIER_OVERLAYS = 500

TIER_TOASTS = 900

TIER_WINDOWS = 200

Constructors

• .new

Instance Method Summary

• #add(layer : Layer) : Layer

  Adds an existing layer to the stack.

• #bring_to_front(layer : Layer) : self

  Elevates a layer above all other layers currently in its tier.

• #clear : self

  Clears all registered layers from the stack.

• #compose(target : Buffer) : Nil

  Composites all visible layers onto the target buffer in ascending z-index order.

• #create_layer(width : Int32, height : Int32, z_index : Int32 = TIER_CONTENT, x : Int32 = 0, y : Int32 = 0, transparent_bg : Bool = true) : Layer

  Factory method to create, configure, and register a new layer.

• #layers : Array(Layer)
• #remove(layer : Layer) : Bool

  Removes a layer from the stack.

• #send_to_back(layer : Layer) : self

  Lowers a layer below all other layers in the stack.

Constructor Detail

Instance Method Detail