Struct TouchState

State layout for a single touch.

Namespace: UnityEngine.InputSystem.LowLevel
Syntax
public struct TouchState : IInputStateTypeInfo
Remarks

This is the low-level memory representation of a single touch, i.e the way touches are internally transmitted and stored in the system. To update touches on a Touchscreen, StateEvents containing TouchStates are sent to the screen.

Fields

delta

Screen-space motion delta of the touch in pixels.

Declaration
public Vector2 delta
Field Value
Type Description
Vector2

Screen-space movement delta.
See Also

flags

Declaration
public byte flags
Field Value
Type Description
Byte

phaseId

TouchPhase value of the touch.

Declaration
public byte phaseId
Field Value
Type Description
Byte

Current TouchPhase.
See Also

position

Screen-space position of the touch in pixels.

Declaration
public Vector2 position
Field Value
Type Description
Vector2

Screen-space position of the touch.
See Also

pressure

Pressure-level of the touch against the touchscreen.

Declaration
public float pressure
Field Value
Type Description
Single

Pressure of touch.
Remarks

The core range for this value is [0..1] with 1 indicating maximum pressure. Note, however, that the actual value may go beyond 1 in practice. This is because the system will usually define "maximum pressure" to be less than the physical maximum limit the hardware is capable of reporting so that to achieve maximum pressure, one does not need to press as hard as possible.

See Also

radius

Radius of the touch print on the surface.

Declaration
public Vector2 radius
Field Value
Type Description
Vector2

Touch extents horizontally and vertically.
Remarks

The touch radius is given in screen-space pixel coordinates along X and Y centered in the middle of the touch. Note that not all screens and systems support radius detection on touches so this value may be at default for an otherwise perfectly valid touch.

See Also

startPosition

The position where the touch started.

Declaration
public Vector2 startPosition
Field Value
Type Description
Vector2

Screen-space start position of the touch.
Remarks

This is set automatically by Touchscreen and does not need to be provided by events sent to the touchscreen.

See Also

startTime

Time that the touch was started. Relative to Time.realTimeSinceStartup.

Declaration
public double startTime
Field Value
Type Description
Double

Time that the touch was started.
Remarks

This is set automatically by Touchscreen and does not need to be provided by events sent to the touchscreen.

See Also

tapCount

Declaration
public byte tapCount
Field Value
Type Description
Byte

touchId

Numeric ID of the touch.

Declaration
public int touchId
Field Value
Type Description
Int32

Numeric ID of the touch.
Remarks

While a touch is ongoing, it must have a non-zero ID different from all other ongoing touches. Starting with Began and ending with Ended or Canceled, a touch is identified by its ID, i.e. a TouchState with the same ID belongs to the same touch.

After a touch has ended or been canceled, an ID can be reused.

See Also

Properties

format

Declaration
public readonly FourCC format { get; }
Property Value
Type Description
FourCC
Implements

Format

Memory format tag for TouchState.

Declaration
public static readonly FourCC Format { get; }
Property Value
Type Description
FourCC

Returns "TOUC".
See Also

isIndirectTouch

Declaration
public bool isIndirectTouch { get; set; }
Property Value
Type Description
Boolean

isInProgress

Declaration
public readonly bool isInProgress { get; }
Property Value
Type Description
Boolean

isNoneEndedOrCanceled

Declaration
public readonly bool isNoneEndedOrCanceled { get; }
Property Value
Type Description
Boolean

isPrimaryTouch

Whether, after not having any touch contacts, this is part of the first touch contact that started.

Declaration
public bool isPrimaryTouch { get; set; }
Property Value
Type Description
Boolean
Remarks

This flag will be set internally by Touchscreen. Generally, it is not necessary to set this bit manually when feeding data to Touchscreens.

isTap

Declaration
public bool isTap { get; set; }
Property Value
Type Description
Boolean

phase

Get or set the phase of the touch.

Declaration
public TouchPhase phase { get; set; }
Property Value
Type Description
TouchPhase

Phase of the touch.
See Also

Methods

ToString()

Return a string representation of the state useful for debugging.

Declaration
public override string ToString()
Returns
Type Description
String

A string representation of the touch state.

See Also