javafx.scene.input

Class TouchEvent

java.lang.Object

Event

javafx.scene.input.InputEvent

javafx.scene.input.TouchEvent

public final class TouchEvent
extends InputEvent

Touch event indicates a touch screen action. It contains detailed information about each particular touch point.

Touch point represents a single touched finger and has its location, state (pressed/moved/released/stationary) and an ID unique in scope of a single gesture. For detailed reference see TouchPoint.

For each multi-touch action a set of touch events is generated - for each touch point one. The event has type corresponds to its touch point's state. Each of the events also contain list of all the touch points. This design allows for handling complicated multi-touch actions from one place while keeping it possible to filter/consume each touch point separately. To recognize which events belong into a single set there is getEventSetId() method.

Each touch point is - similarly to mouse dragging - delivered to a single node on which it was pressed, regardless of where it moves then. It is possible to change this behavior by using a grabbing mechanism described in TouchPoint documentation.

Since:

JavaFX 2.2

Field Summary

Fields

Modifier and Type	Field and Description
private boolean	altDown Whether or not the Alt modifier is down on this event.
static <any>	ANY Common supertype for all touch event types.
private boolean	controlDown Whether or not the Control modifier is down on this event.
private int	eventSetId
private boolean	metaDown Whether or not the Meta modifier is down on this event.
private static long	serialVersionUID
private boolean	shiftDown Whether or not the Shift modifier is down on this event.
static <any>	TOUCH_MOVED This event occurs when the touch point is moved.
static <any>	TOUCH_PRESSED This event occurs when the touch point is pressed (touched for the first time).
static <any>	TOUCH_RELEASED This event occurs when the touch point is released.
static <any>	TOUCH_STATIONARY This event occurs when the touch point is pressed and still (doesn't move).
private TouchPoint	touchPoint
private java.util.List<TouchPoint>	touchPoints

Constructor Summary

Constructors

Constructor and Description
TouchEvent(<any> eventType, TouchPoint touchPoint, java.util.List<TouchPoint> touchPoints, int eventSetId, boolean shiftDown, boolean controlDown, boolean altDown, boolean metaDown) Constructs new TouchEvent event with null source and target.
TouchEvent(java.lang.Object source, EventTarget target, <any> eventType, TouchPoint touchPoint, java.util.List<TouchPoint> touchPoints, int eventSetId, boolean shiftDown, boolean controlDown, boolean altDown, boolean metaDown) Constructs new TouchEvent event.

Method Summary

Modifier and Type	Method and Description
TouchEvent	copyFor(java.lang.Object newSource, EventTarget newTarget)
TouchEvent	copyFor(java.lang.Object newSource, EventTarget newTarget, <any> type) Creates a copy of the given event with the given fields substituted.
int	getEventSetId() Gets sequential number of the set of touch events representing the same multi-touch action.
<any>	getEventType()
int	getTouchCount() Returns number of touch points represented by this touch event set.
TouchPoint	getTouchPoint() Gets the touch point of this event.
java.util.List<TouchPoint>	getTouchPoints() Gets all the touch points represented by this set of touch events, including the touch point of this event.
boolean	isAltDown() Whether or not the Alt modifier is down on this event.
boolean	isControlDown() Whether or not the Control modifier is down on this event.
boolean	isMetaDown() Whether or not the Meta modifier is down on this event.
boolean	isShiftDown() Whether or not the Shift modifier is down on this event.
private static void	recomputeToSource(TouchEvent event, java.lang.Object oldSource, java.lang.Object newSource) Recomputes touch event for the given event source object.
java.lang.String	toString() Returns a string representation of this TouchEvent object.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

ANY

public static final <any> ANY

Common supertype for all touch event types.

TOUCH_PRESSED

public static final <any> TOUCH_PRESSED

This event occurs when the touch point is pressed (touched for the first time).

TOUCH_MOVED

public static final <any> TOUCH_MOVED

This event occurs when the touch point is moved.

TOUCH_RELEASED

public static final <any> TOUCH_RELEASED

This event occurs when the touch point is released.

TOUCH_STATIONARY

public static final <any> TOUCH_STATIONARY

This event occurs when the touch point is pressed and still (doesn't move).

eventSetId

private final int eventSetId

shiftDown

private final boolean shiftDown

Whether or not the Shift modifier is down on this event.

controlDown

private final boolean controlDown

Whether or not the Control modifier is down on this event.

altDown

private final boolean altDown

Whether or not the Alt modifier is down on this event.

metaDown

private final boolean metaDown

Whether or not the Meta modifier is down on this event.

touchPoint

private final TouchPoint touchPoint

touchPoints

private final java.util.List<TouchPoint> touchPoints

Constructor Detail

TouchEvent

public TouchEvent(java.lang.Object source,
                  EventTarget target,
                  <any> eventType,
                  TouchPoint touchPoint,
                  java.util.List<TouchPoint> touchPoints,
                  int eventSetId,
                  boolean shiftDown,
                  boolean controlDown,
                  boolean altDown,
                  boolean metaDown)

Constructs new TouchEvent event.

Parameters:

source - the source of the event. Can be null.

target - the target of the event. Can be null.

eventType - The type of the event.

touchPoint - the touch point of this event

touchPoints - set of touch points for the multi-touch action

eventSetId - set id of the multi-touch action

shiftDown - true if shift modifier was pressed.

controlDown - true if control modifier was pressed.

altDown - true if alt modifier was pressed.

metaDown - true if meta modifier was pressed.

Since:

JavaFX 8.0

TouchEvent

public TouchEvent(<any> eventType,
                  TouchPoint touchPoint,
                  java.util.List<TouchPoint> touchPoints,
                  int eventSetId,
                  boolean shiftDown,
                  boolean controlDown,
                  boolean altDown,
                  boolean metaDown)

Constructs new TouchEvent event with null source and target.

Parameters:

eventType - The type of the event.

touchPoint - the touch point of this event

touchPoints - set of touch points for the multi-touch action

eventSetId - set id of the multi-touch action

shiftDown - true if shift modifier was pressed.

controlDown - true if control modifier was pressed.

altDown - true if alt modifier was pressed.

metaDown - true if meta modifier was pressed.

Since:

JavaFX 8.0

Method Detail

getTouchCount

public int getTouchCount()

Returns number of touch points represented by this touch event set. The returned number matches the size of the touchPoints list.

Returns:

The number of touch points represented by this touch event set.

recomputeToSource

private static void recomputeToSource(TouchEvent event,
                                      java.lang.Object oldSource,
                                      java.lang.Object newSource)

Recomputes touch event for the given event source object.

Parameters:

event - Event to modify

oldSource - Source object of the current values

newSource - Source object to compute values for

copyFor

public TouchEvent copyFor(java.lang.Object newSource,
                          EventTarget newTarget)

Returns:

the event copy with the new source and target

copyFor

public TouchEvent copyFor(java.lang.Object newSource,
                          EventTarget newTarget,
                          <any> type)

Creates a copy of the given event with the given fields substituted.

Parameters:

newSource - the new source of the copied event

newTarget - the new target of the copied event

type - the new eventType

Returns:

the event copy with the fields substituted

Since:

JavaFX 8.0

getEventType

public <any> getEventType()

Overrides:

getEventType in class InputEvent

getEventSetId

public final int getEventSetId()

Gets sequential number of the set of touch events representing the same multi-touch action. For a multi-touch user action, number of touch points may exist; each of them produces a touch event, each of those touch events carry the same list of touch points - and all of them return the same number from this method. Then state of some of the touch points changes and the new set of events has new id. The id is guaranteed to be sequential and unique in scope of one gesture (is reset when all touch points are released).

Returns:

Sequential id of event set unique in scope of a gesture

isShiftDown

public final boolean isShiftDown()

Whether or not the Shift modifier is down on this event.

Returns:

true if the Shift modifier is down on this event

isControlDown

public final boolean isControlDown()

Whether or not the Control modifier is down on this event.

Returns:

true if the Control modifier is down on this event

isAltDown

public final boolean isAltDown()

Whether or not the Alt modifier is down on this event.

Returns:

true if the Alt modifier is down on this event

isMetaDown

public final boolean isMetaDown()

Whether or not the Meta modifier is down on this event.

Returns:

true if the Meta modifier is down on this event

getTouchPoint

public TouchPoint getTouchPoint()

Gets the touch point of this event.

Returns:

Touch point of this event

getTouchPoints

public java.util.List<TouchPoint> getTouchPoints()

Gets all the touch points represented by this set of touch events, including the touch point of this event. The list is unmodifiable and is sorted by their IDs, which means it is also sorted by the time they were pressed. To distinguish between touch points belonging to a node and unrelated touch points, TouchPoint's belongsTo method can be used.

Returns:

All current touch points in an unmodifiable list

toString

public java.lang.String toString()

Returns a string representation of this TouchEvent object.

Returns:

a string representation of this TouchEvent object.