Class TouchControl

A control representing a touch contact.

Inheritance
Object
InputControl
InputControl<TouchState>
TouchControl
Inherited Members
Namespace: UnityEngine.InputSystem.Controls
Syntax
public class TouchControl : InputControl<TouchState>
Remarks

Note that unlike most other control types, TouchControls do not have a flexible memory layout. They are hardwired to TouchState and will not work correctly with a different memory layouts. Additional fields may be appended to the struct but what's there in the struct has to be located at exactly those memory addresses.

Constructors

TouchControl()

Default-initialize the touch control.

Declaration
public TouchControl()
Remarks

Sets the format to "TOUC".

Properties

delta

Screen-space motion delta of the touch.

Declaration
public Vector2Control delta { get; set; }
Property Value
Type Description
Vector2Control

Control representing the screen-space motion delta of the touch.
Remarks

This is either supplied directly by the underlying platform or computed on the fly by Touchscreen from the last known position of the touch.

Note that deltas have behaviors attached to them different from most other controls. See delta for details.

See Also

indirectTouch

Whether the touch comes from a source other than direct contact with the touch surface.

Declaration
public ButtonControl indirectTouch { get; set; }
Property Value
Type Description
ButtonControl

Control indicating whether the touch was generated indirectly.
Remarks

Indirect touches can be generated with a stylus, for example.

isInProgress

Whether a touch on the control is currently is progress.

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

If true, a touch is in progress, i.e. has a phase of Began, Moved, or Canceled.

phase

Current phase of the touch.

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

Control representing the current phase of the touch.
Remarks

This will be None if no touch has been registered on the control yet or if the control has been reset to its default state.

See Also

position

Absolute screen-space position on the touch surface.

Declaration
public Vector2Control position { get; set; }
Property Value
Type Description
Vector2Control

Control representing the screen-space of the touch.
See Also

press

Button that indicates whether there is currently an ongoing touch contact on the control. When touch is ongoing, button will be 1, otherwise button will be 0.

Declaration
public TouchPressControl press { get; set; }
Property Value
Type Description
TouchPressControl

Control representing an ongoing touch contact.
Remarks

This control simply monitors phase and will read as 1 whenever the phase is Began, Moved, or Stationary.

See Also

pressure

Normalized pressure of the touch against the touch surface.

Declaration
public AxisControl pressure { get; set; }
Property Value
Type Description
AxisControl

Control representing the pressure level of the touch.
Remarks

Not all touchscreens are pressure-sensitive. If unsupported, this control will remain at default value.

In general, touch pressure is supported on mobile platforms only.

Note that it is possible for the value to go above 1 even though it is considered normalized. The reason is that calibration on the system can put the maximum pressure point below the physically supported maximum value.

See Also

radius

Screen-space radius of the touch.

Declaration
public Vector2Control radius { get; set; }
Property Value
Type Description
Vector2Control

Control representing the horizontal and vertical extents of the touch contact.
Remarks

If supported by the device, this reports the size of the touch contact based on its position center point. If not supported, this will be default(Vector2).

See Also

startPosition

Screen-space position where the touch started.

Declaration
public Vector2Control startPosition { get; set; }
Property Value
Type Description
Vector2Control

Control representing the start position of the touch.
See Also

startTime

Time in seconds on the same timeline as Time.realTimeSinceStartup when the touch began.

Declaration
public DoubleControl startTime { get; set; }
Property Value
Type Description
DoubleControl

Control representing the start time of the touch.
Remarks

This is the value of time when the touch starts with phase Began.

See Also

tap

Whether the touch has performed a tap.

Declaration
public ButtonControl tap { get; set; }
Property Value
Type Description
ButtonControl

Control that indicates whether the touch has tapped the screen.
Remarks

A tap is defined as a touch that begins and ends within defaultTapTime and stays within tapRadius of its startPosition. If this is the case for a touch, this button is set to 1 at the time the touch goes to phase Ended.

The button resets to 0 only when another touch is started on the control or when the control is reset.

See Also

tapCount

Number of times that the touch has been tapped in succession.

Declaration
public IntegerControl tapCount { get; set; }
Property Value
Type Description
IntegerControl

Control that indicates how many taps have been performed one after the other.
Remarks

Successive taps have to come within multiTapDelayTime for them to increase the tap count. I.e. if a new tap finishes within that time after startTime of the previous touch, the tap count is increased by one. If more than multiTapDelayTime passes after a tap with no successive tap, the tap count is reset to zero.

touchId

The ID of the touch contact as reported by the underlying system.

Declaration
public IntegerControl touchId { get; set; }
Property Value
Type Description
IntegerControl

Control reading out the ID of the touch.
Remarks

Each touch contact that is made with the screen receives its own unique ID which is normally assigned by the underlying platform.

Note a platform may reuse touch IDs after their respective touches have finished. This means that the guarantee of uniqueness is only made with respect to currently ongoing touches.

See Also

Methods

FinishSetup()

Perform final initialization tasks after the control hierarchy has been put into place.

Declaration
protected override void FinishSetup()
Overrides
Remarks

This method can be overridden to perform control- or device-specific setup work. The most common use case is for looking up child controls and storing them in local getters.

public class MyDevice : InputDevice
{
    public ButtonControl button { get; private set; }
    public AxisControl axis { get; private set; }

    protected override void OnFinishSetup()
    {
        // Cache controls in getters.
        button = GetChildControl("button");
        axis = GetChildControl("axis");
    }
}

ReadUnprocessedValueFromState(Void*)

Declaration
public override TouchState ReadUnprocessedValueFromState(void *statePtr)
Parameters
Type Name Description
Void* statePtr
Returns
Type Description
TouchState
Overrides
UnityEngine.InputSystem.InputControl<UnityEngine.InputSystem.LowLevel.TouchState>.ReadUnprocessedValueFromState(System.Void*)

WriteValueIntoState(TouchState, Void*)

Declaration
public override void WriteValueIntoState(TouchState value, void *statePtr)
Parameters
Type Name Description
TouchState value
Void* statePtr
Overrides
UnityEngine.InputSystem.InputControl<UnityEngine.InputSystem.LowLevel.TouchState>.WriteValueIntoState(UnityEngine.InputSystem.LowLevel.TouchState, System.Void*)

Extension Methods