ScreenModeDetector class

Detects when the remote terminal switches into or out of the alternate screen buffer, by watching the output byte stream for the DEC private-mode sequences full-screen programs emit:

• enter: ESC [ ? 1049 h (also the older ESC [ ? 1047 h)
• leave: ESC [ ? 1049 l (also the older ESC [ ? 1047 l)

nano, vim, less, top and htop all toggle the alternate screen this way. The connect client uses the transition to switch its LineEditor between local line editing and raw passthrough: while a full-screen app owns the screen, keystrokes must reach the app unmodified rather than being parsed as a local command line.

The detector is a passive observer — it never alters the bytes (they are still forwarded to the local terminal so it mirrors the alternate-screen switch). Sequences split across feed chunks are handled by carrying over a short suffix between calls.

Constructors

ScreenModeDetector()

Properties

hashCode → int

The hash code for this object.

no setter, inherited

inAltScreen ↔ bool

Whether the remote terminal is currently in the alternate screen buffer.

getter/setter pair

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

feed(List<int> chunk) → bool

Feeds a chunk of remote output. Returns true when inAltScreen changed as a result. Never modifies or consumes the forwarded bytes.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

reset() → void

Clears carried state and resets to the non-alternate screen.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited