Class TouchPoint

  • All Implemented Interfaces:
    Serializable

    public final class TouchPoint
    extends Object
    implements Serializable
    Touch point represents a single point of a multi-touch action, typically one finger touching a screen. It is contained in TouchEvent.

    The touch point has its coordinates, state (see TouchPoint.State) and ID. The ID is sequential number of this touch point unique in scope of a single multi-touch gesture.

    Each touch point is by default delivered to a single node during its whole trajectory - to the node on which it was pressed. There is a grabbing API to modify this behavior. The above means that when touch point is pressed, it is automatically grabbed by the top-most node on the press coordinates. Any time during the gesture grab() and ungrab() methods can be used to alter the event delivery target. When grabbed by a different node, it will next time be targeted to it; when ungrabbed, it will be always targeted to the top-most node on the current location.

    Since:
    JavaFX 2.2
    See Also:
    Serialized Form
    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      static class  TouchPoint.State
      Represents current state of the touch point
    • Constructor Summary

      Constructors 
      Constructor Description
      TouchPoint​(int id, TouchPoint.State state, double x, double y, double screenX, double screenY, EventTarget target, PickResult pickResult)
      Creates new instance of TouchPoint.
    • Method Summary

      Modifier and Type Method Description
      boolean belongsTo​(EventTarget target)
      Distinguishes between touch points targeted to the given node or some of its children from touch points targeted somewhere else.
      EventTarget getGrabbed()
      Gets event target which has grabbed this touch point.
      int getId()
      Gets identifier of this touch point.
      PickResult getPickResult()
      Returns information about the pick.
      double getSceneX()
      Gets the horizontal position of the touch point relative to the origin of the Scene that contains the TouchEvent's source.
      double getSceneY()
      Gets the vertical position of the touch point relative to the origin of the Scene that contains the TouchEvent's source.
      double getScreenX()
      Gets the absolute horizontal position of the touch point.
      double getScreenY()
      Gets the absolute vertical position of the touch point.
      TouchPoint.State getState()
      Gets state of this touch point
      EventTarget getTarget()
      Gets event target on which the touch event carrying this touch point is fired.
      double getX()
      Gets the horizontal position of the touch point relative to the origin of the TouchEvent's source.
      double getY()
      Gets the vertical position of the touch point relative to the origin of the TouchEvent's source.
      double getZ()
      Depth position of the event relative to the origin of the MouseEvent's source.
      void grab()
      Grabs this touch point by current event source.
      void grab​(EventTarget target)
      Grabs this touch point by the given target.
      String toString()
      Returns a string representation of this TouchPoint object.
      void ungrab()
      Ungrabs this touch point from its target.
    • Constructor Detail

      • TouchPoint

        public TouchPoint​(int id,
                          TouchPoint.State state,
                          double x,
                          double y,
                          double screenX,
                          double screenY,
                          EventTarget target,
                          PickResult pickResult)
        Creates new instance of TouchPoint.
        Parameters:
        id - ID of the new touch point
        state - state of the new touch point
        x - The x with respect to the scene.
        y - The y with respect to the scene.
        screenX - The x coordinate relative to screen.
        screenY - The y coordinate relative to screen.
        target - Node or other event target.
        pickResult - pick result. Can be null, in this case a 2D pick result without any further values is constructed based on the scene coordinates and target
        Since:
        JavaFX 8.0
    • Method Detail

      • belongsTo

        public boolean belongsTo​(EventTarget target)
        Distinguishes between touch points targeted to the given node or some of its children from touch points targeted somewhere else. This allows for testing all touch points carried by one touch event on their relevance for a given node.
        Parameters:
        target - Node or other event target to be tested
        Returns:
        true if this touch point is targeted to the given target or some of its children
      • getGrabbed

        public EventTarget getGrabbed()
        Gets event target which has grabbed this touch point.
        Returns:
        The current grabbed target, null if the touch point is ungrabbed
      • grab

        public void grab()
        Grabs this touch point by current event source. Next event containing this touch point will be targeted to the same node whose event handler called this method.
      • grab

        public void grab​(EventTarget target)
        Grabs this touch point by the given target. Next event containing this touch point will be targeted to it.
        Parameters:
        target - Target by which to grab the touch point
      • ungrab

        public void ungrab()
        Ungrabs this touch point from its target. Since the next event this touch point will be delivered to the top-most node picked on its respective location until it is grabbed again or released.
      • getId

        public final int getId()
        Gets identifier of this touch point. The number is sequential and unique in scope of one multi touch gesture. The first pressed touch point has id 1, each subsequently pressed touch points gets the next ordinal number until all touch points are released and the counter is reset.
        Returns:
        the identifier of this touch point.
      • getState

        public final TouchPoint.State getState()
        Gets state of this touch point
        Returns:
        state of this touch point
      • getX

        public final double getX()
        Gets the horizontal position of the touch point relative to the origin of the TouchEvent's source.
        Returns:
        the horizontal position of the touch point relative to the origin of the TouchEvent's source.
      • getY

        public final double getY()
        Gets the vertical position of the touch point relative to the origin of the TouchEvent's source.
        Returns:
        the vertical position of the touch point relative to the origin of the TouchEvent's source.
      • getZ

        public final double getZ()
        Depth position of the event relative to the origin of the MouseEvent's source.
        Returns:
        depth position of the event relative to the origin of the MouseEvent's source.
        Since:
        JavaFX 8.0
      • getScreenX

        public final double getScreenX()
        Gets the absolute horizontal position of the touch point.
        Returns:
        the absolute horizontal position of the touch point
      • getScreenY

        public final double getScreenY()
        Gets the absolute vertical position of the touch point.
        Returns:
        the absolute vertical position of the touch point
      • getSceneX

        public final double getSceneX()
        Gets the horizontal position of the touch point relative to the origin of the Scene that contains the TouchEvent's source. If the node is not in a Scene, then the value is relative to the boundsInParent of the root-most parent of the TouchEvent's node. Note that in 3D scene, this represents the flat coordinates after applying the projection transformations.
        Returns:
        the horizontal position of the touch point relative to the origin of the Scene that contains the TouchEvent's source
      • getSceneY

        public final double getSceneY()
        Gets the vertical position of the touch point relative to the origin of the Scene that contains the TouchEvent's source. If the node is not in a Scene, then the value is relative to the boundsInParent of the root-most parent of the TouchEvent's node. Note that in 3D scene, this represents the flat coordinates after applying the projection transformations.
        Returns:
        the vertical position of the touch point relative to the origin of the Scene that contains the TouchEvent's source
      • getPickResult

        public final PickResult getPickResult()
        Returns information about the pick.
        Returns:
        new PickResult object that contains information about the pick
        Since:
        JavaFX 8.0
      • getTarget

        public EventTarget getTarget()
        Gets event target on which the touch event carrying this touch point is fired.
        Returns:
        Event target for this touch point
      • toString

        public String toString()
        Returns a string representation of this TouchPoint object.
        Overrides:
        toString in class Object
        Returns:
        a string representation of this TouchPoint object.