class Opal::UI::Layer

• Opal::UI::Layer
• Reference
• Object

Overview

Represents an isolated 2D drawing surface with position, z-index, visibility, and clipping rectangle. Layers allow complex UIs, floating windows, dropdowns, and overlays to be rendered independently and composited in depth order.

Defined in:

opal/ui/layer.cr

Constructors

• .new(width : Int32, height : Int32, x : Int32 = 0, y : Int32 = 0, z_index : Int32 = 0, visible : Bool = true, transparent_bg : Bool = true, clip_rect : Rect | Nil = nil)

Instance Method Summary

• #blit_to(target : Buffer) : Nil

  Blits this layer onto a target buffer at (@x, @y), respecting visibility, transparent_bg, and any layer clipping rectangle.

• #buffer : Buffer
• #clear : Nil

  Clears the layer's internal buffer.

• #clip_rect : Rect | Nil
• #clip_rect=(clip_rect : Rect | Nil)
• #height : Int32
• #opacity : Float64
• #opacity=(opacity : Float64)
• #render_element(element : Element, rel_x : Int32 = 0, rel_y : Int32 = 0, render_w : Int32 | Nil = nil, render_h : Int32 | Nil = nil) : Nil

  Renders a declarative UI element onto this layer.

• #resize(new_width : Int32, new_height : Int32) : self

  Resizes the layer's internal buffer, preserving existing content if possible.

• #transparent_bg=(transparent_bg : Bool)
• #transparent_bg? : Bool
• #visible=(visible : Bool)
• #visible? : Bool
• #width : Int32
• #x : Int32
• #x=(x : Int32)
• #y : Int32
• #y=(y : Int32)
• #z_index : Int32
• #z_index=(z_index : Int32)

Constructor Detail

Instance Method Detail