struct Termisu::RenderState

• Termisu::RenderState
• Struct
• Value
• Object

Overview

Tracks the current terminal rendering state for optimization.

Used to avoid emitting redundant escape sequences by tracking what colors, attributes, and cursor position are currently set. Only emits escape sequences when the state actually changes.

Example:

state = Termisu::RenderState.new

# First cell - emits all sequences
state.apply_style(renderer, fg: Color.green, bg: Color.black, attr: Attribute::Bold)

# Second cell with same style - no sequences emitted
state.apply_style(renderer, fg: Color.green, bg: Color.black, attr: Attribute::Bold)

# Third cell with different color - only color change emitted
state.apply_style(renderer, fg: Color.red, bg: Color.black, attr: Attribute::Bold)

Defined in:

termisu/render_state.cr

Constructors

• .new

Instance Method Summary

• #advance_cursor

  Advances cursor X position without emitting escape sequence.

• #apply_style(renderer : Renderer, fg : Color, bg : Color, attr : Attribute) : Bool

  Applies style to renderer, only emitting changes.

• #attr : Attribute

  Current text attributes

• #attr=(attr : Attribute)

  Current text attributes

• #bg : Color | Nil

  Current background color (nil = unknown/reset)

• #bg=(bg : Color | Nil)

  Current background color (nil = unknown/reset)

• #cursor_at?(x : Int32, y : Int32) : Bool

  Checks if cursor is at the expected position for a horizontal write.

• #cursor_x : Int32 | Nil

  Current cursor X position (nil = unknown)

• #cursor_x=(cursor_x : Int32 | Nil)

  Current cursor X position (nil = unknown)

• #cursor_y : Int32 | Nil

  Current cursor Y position (nil = unknown)

• #cursor_y=(cursor_y : Int32 | Nil)

  Current cursor Y position (nil = unknown)

• #fg : Color | Nil

  Current foreground color (nil = unknown/reset)

• #fg=(fg : Color | Nil)

  Current foreground color (nil = unknown/reset)

• #move_cursor(renderer : Renderer, x : Int32, y : Int32) : Bool

  Moves cursor only if position changed.

• #reset

  Resets state to unknown (forces next render to emit all sequences).

Constructor Detail

Instance Method Detail