TouchEvent

Struct

Source: TouchEvent.h

Description

Compact touch event structure (12 bytes total, naturally aligned)

Memory layout (naturally aligned, no packing needed):

• timestamp: 4 bytes (offset 0)
• x: 2 bytes (offset 4)
• y: 2 bytes (offset 6)
• type: 1 byte (offset 8)
• flags: 1 byte (offset 9)
• id: 1 byte (offset 10)
• _padding: 1 byte (offset 11) Total: 12 bytes

Invariants:

• timestamp always monotonically increasing per touch ID
• x, y always valid (within display bounds)
• type always non-None when queued

Properties

Name	Type	Description
timestamp	uint32_t	Timestamp in milliseconds
x	int16_t	X coordinate
y	int16_t	Y coordinate
type	uint8_t	Event type
flags	uint8_t	Event flags
id	uint8_t	Touch ID (0-4)
_padding	uint8_t	Explicit padding for alignment

Methods

, x(0)

Description:

Default constructor - creates empty event

, y(0)

, type(0)

, flags(0)

, id(0)

, _padding(0)

, x(xPos)

Description:

Construct touch event with all fields

Parameters:

• eventType: Type of event
• touchId: Touch identifier
• xPos: X coordinate
• yPos: Y coordinate
• ts: Timestamp in ms
• eventFlags: Event flags

, y(yPos)

, type(static_cast<uint8_t>(eventType))

, flags(static_cast<uint8_t>(eventFlags))

, id(touchId)

TouchEventType getType() const

Description:

Get event type as enum

Returns: Event type

TouchEventFlags getFlags() const

Description:

Get event flags as enum

Returns: Event flags

void setType(TouchEventType eventType)

Description:

Set event type from enum

Parameters:

• eventType: Type of event

void setFlags(TouchEventFlags eventFlags)

Description:

Set event flags from enum

Parameters:

• eventFlags: Event flags

bool isValid() const

Description:

Check if event is valid (has a type)

Returns: true if type is not None

bool isPrimary() const

Description:

Check if this is a primary touch

Returns: true if Primary flag is set

bool isConsumed() const

Description:

Check if event was consumed

Returns: true if Consumed flag is set

void consume()

Description:

Mark event as consumed

void setPrimary()

Description:

Set primary flag