com.almeros.android.multitouch.gesturedetectors

Class TwoFingerGestureDetector

java.lang.Object

com.almeros.android.multitouch.gesturedetectors.BaseGestureDetector

com.almeros.android.multitouch.gesturedetectors.TwoFingerGestureDetector

Direct Known Subclasses:

RotateGestureDetector, ShoveGestureDetector

public abstract class TwoFingerGestureDetector
extends BaseGestureDetector

Field Summary

Fields

Modifier and Type	Field and Description
protected float	currFingerDiffX
protected float	currFingerDiffY
protected float	prevFingerDiffX
protected float	prevFingerDiffY

Fields inherited from class com.almeros.android.multitouch.gesturedetectors.BaseGestureDetector

context, currEvent, currPressure, gestureInProgress, PRESSURE_THRESHOLD, prevEvent, prevPressure, timeDelta

Constructor Summary

Constructors

Constructor and Description
TwoFingerGestureDetector(android.content.Context context)

Method Summary

Modifier and Type	Method and Description
static android.graphics.PointF	determineFocalPoint(android.view.MotionEvent motionEvent) Determine (multi)finger focal point (a.k.a.
float	getCurrentSpan() Return the current distance between the two pointers forming the gesture in progress.
float	getFocusX()
float	getFocusY()
float	getPreviousSpan() Return the previous distance between the two pointers forming the gesture in progress.
protected static float	getRawX(android.view.MotionEvent event, int pointerIndex) MotionEvent has no getRawX(int) method; simulate it pending future API approval.
protected static float	getRawY(android.view.MotionEvent event, int pointerIndex) MotionEvent has no getRawY(int) method; simulate it pending future API approval.
protected abstract void	handleInProgressEvent(int actionCode, android.view.MotionEvent event) Called when the current event occurred when a gesture IS in progress.
protected abstract void	handleStartProgressEvent(int actionCode, android.view.MotionEvent event) Called when the current event occurred when NO gesture is in progress yet.
protected boolean	isSloppyGesture(android.view.MotionEvent event) Check if we have a sloppy gesture.
protected void	updateStateByEvent(android.view.MotionEvent curr)

Methods inherited from class com.almeros.android.multitouch.gesturedetectors.BaseGestureDetector

getEventTime, getTimeDelta, isInProgress, onTouchEvent, resetState

Methods inherited from class java.lang.Object

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

Field Detail

prevFingerDiffX

protected float prevFingerDiffX

prevFingerDiffY

protected float prevFingerDiffY

currFingerDiffX

protected float currFingerDiffX

currFingerDiffY

protected float currFingerDiffY

Constructor Detail

TwoFingerGestureDetector

public TwoFingerGestureDetector(android.content.Context context)

Method Detail

handleStartProgressEvent

protected abstract void handleStartProgressEvent(int actionCode,
                                                 android.view.MotionEvent event)

Description copied from class: BaseGestureDetector

Called when the current event occurred when NO gesture is in progress yet. The handling in this implementation may set the gesture in progress (via gestureInProgress) or out of progress

Specified by:

handleStartProgressEvent in class BaseGestureDetector

Parameters:

actionCode - Action Code from MotionEvent

event - MotionEvent

handleInProgressEvent

protected abstract void handleInProgressEvent(int actionCode,
                                              android.view.MotionEvent event)

Description copied from class: BaseGestureDetector

Called when the current event occurred when a gesture IS in progress. The handling in this implementation may set the gesture out of progress (via gestureInProgress).

Specified by:

handleInProgressEvent in class BaseGestureDetector

Parameters:

actionCode - Action Code from MotionEvent

event - MotionEvent

updateStateByEvent

protected void updateStateByEvent(android.view.MotionEvent curr)

Overrides:

updateStateByEvent in class BaseGestureDetector

getCurrentSpan

public float getCurrentSpan()

Return the current distance between the two pointers forming the gesture in progress.

Returns:

Distance between pointers in pixels.

getPreviousSpan

public float getPreviousSpan()

Return the previous distance between the two pointers forming the gesture in progress.

Returns:

Previous distance between pointers in pixels.

getRawX

protected static float getRawX(android.view.MotionEvent event,
                               int pointerIndex)

MotionEvent has no getRawX(int) method; simulate it pending future API approval.

Parameters:

event - Motion Event

pointerIndex - Pointer Index

Returns:

Raw x value or 0

getRawY

protected static float getRawY(android.view.MotionEvent event,
                               int pointerIndex)

MotionEvent has no getRawY(int) method; simulate it pending future API approval.

Parameters:

event - Motion Event

pointerIndex - Pointer Index

Returns:

Raw y value or 0

isSloppyGesture

protected boolean isSloppyGesture(android.view.MotionEvent event)

Check if we have a sloppy gesture. Sloppy gestures can happen if the edge of the user's hand is touching the screen, for example.

Parameters:

event - Motion Event

Returns:

true if is sloppy gesture, false if not

determineFocalPoint

public static android.graphics.PointF determineFocalPoint(android.view.MotionEvent motionEvent)

Determine (multi)finger focal point (a.k.a. center point between all fingers)

Parameters:

motionEvent - Motion Event

Returns:

PointF focal point

getFocusX

public float getFocusX()

getFocusY

public float getFocusY()